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1,802.0676 | One-dimensional System Arising in Stochastic Gradient Descent | We consider SDEs of the form $dX_t = |f(X_t)|/t^{\gamma} dt+1/t^{\gamma} dB_t$, where $f(x)$ behaves comparably to $|x|^k$ in a neighborhood of the origin, for $k\in [1,\infty)$. We show that there exists a threshold value $:=\tilde{\gamma}$ for $\gamma$, depending on $k$, such that when $\gamma \in (1/2, \tilde{\gamma})$ then $\mathbb{P}(X_n\rightarrow 0) = 0$, and for the rest of the permissible values $\mathbb{P}(X_n\rightarrow 0)>0$. The previous results extend for discrete processes that satisfy $X_{n+1}-X_n = f(X_n)/n^\gamma +Y_n/n^\gamma$. Here, $Y_{n+1}$ are martingale differences that are a.s. bounded.
This result shows that for a function $F$, whose second derivative at degenerate saddle points is of polynomial order, it is always possible to escape saddle points via the iteration $X_{n+1}-X_n =F'(X_n)/n^\gamma +Y_n/n^\gamma$ for a suitable choice of $\gamma$. | math.PR | we consider sdes of the form dx_t fx_ttgamma dt1tgamma db_t where fx behaves comparably to xk in a neighborhood of the origin for kin 1infty we show that there exists a threshold value tildegamma for gamma depending on k such that when gamma in 12 tildegamma then mathbbpx_nrightarrow 0 0 and for the rest of the permissible values mathbbpx_nrightarrow 00 the previous results extend for discrete processes that satisfy x_n1x_n fx_nngamma y_nngamma here y_n1 are martingale differences that are as bounded this result shows that for a function f whose second derivative at degenerate saddle points is of polynomial order it is always possible to escape saddle points via the iteration x_n1x_n fx_nngamma y_nngamma for a suitable choice of gamma | [['we', 'consider', 'sdes', 'of', 'the', 'form', 'dx_t', 'fx_ttgamma', 'dt1tgamma', 'db_t', 'where', 'fx', 'behaves', 'comparably', 'to', 'xk', 'in', 'a', 'neighborhood', 'of', 'the', 'origin', 'for', 'kin', '1infty', 'we', 'show', 'that', 'there', 'exists', 'a', 'threshold', 'value', 'tildegamma', 'for', 'gamma', 'depending', 'on', 'k', 'such', 'that', 'when', 'gamma', 'in', '12', 'tildegamma', 'then', 'mathbbpx_nrightarrow', '0', '0', 'and', 'for', 'the', 'rest', 'of', 'the', 'permissible', 'values', 'mathbbpx_nrightarrow', '00', 'the', 'previous', 'results', 'extend', 'for', 'discrete', 'processes', 'that', 'satisfy', 'x_n1x_n', 'fx_nngamma', 'y_nngamma', 'here', 'y_n1', 'are', 'martingale', 'differences', 'that', 'are', 'as', 'bounded', 'this', 'result', 'shows', 'that', 'for', 'a', 'function', 'f', 'whose', 'second', 'derivative', 'at', 'degenerate', 'saddle', 'points', 'is', 'of', 'polynomial', 'order', 'it', 'is', 'always', 'possible', 'to', 'escape', 'saddle', 'points', 'via', 'the', 'iteration', 'x_n1x_n', 'fx_nngamma', 'y_nngamma', 'for', 'a', 'suitable', 'choice', 'of', 'gamma']] | [-0.1362510487670079, 0.12399063263936634, -0.06602490327765866, 0.05349114062950581, -0.0464234040908715, -0.1621846596909953, 0.08358372422039143, 0.3618414686809826, -0.3201518817555292, -0.1690977573037214, 0.07906804150427758, -0.3288253622262606, -0.10991072789849048, 0.19624818155508755, -0.020707559647105103, 0.02065474984777081, 0.017300311985309236, 0.09923453638163794, -0.050707225652981185, -0.2120668272275777, 0.34127556963358074, -0.060688507932354696, 0.14261700274905056, 0.0115331332822929, 0.13436444982757426, -0.025420505736422325, 0.07534085085665408, -0.029490084570300366, -0.19799173396268088, 0.001369824930277121, 0.26269860355283264, 0.07451125380300384, 0.3041770067731185, -0.31232499584023443, -0.15968373979558237, 0.21428224301780574, 0.14551831090856077, -0.03365632094106071, -0.020842077389326214, -0.20225029083667323, 0.1692628959738483, -0.07337459883897932, -0.16339670174888202, -0.03862099016207919, 0.10387774946866557, 0.06314153830836793, -0.36576587946287226, 0.0888819633816768, 0.08035866266124815, 0.02159713398369994, -0.03971886349193353, -0.17691992380839242, -0.0451512428823792, 0.07092447416679144, 0.04395796007572374, 0.10817590077931527, 0.07441961133320417, -0.09002423855209989, -0.06414929756179585, 0.37493345943013473, -0.10115109399547302, -0.22792628781670438, 0.12293794714995394, -0.19002530461044184, -0.19084512873918616, 0.14332831054634557, 0.09234336755746751, 0.14795823037690883, -0.07217481387137273, 0.19314736119486042, -0.056242593667515654, 0.13078281611836115, 0.10550170337124395, -0.017235355102457106, 0.08519629624580764, 0.07987482530006673, 0.1522721767209337, 0.06529472971409891, -0.05284733249884864, -0.08670180286208051, -0.3894254933942908, -0.16379932319562482, -0.19188571335897514, 0.13385988571202947, -0.11386579144150996, -0.1772177850029298, 0.30449827269850566, 0.11052700782186418, 0.2347213629732973, 0.11749380789322979, 0.1896893668901092, 0.19100959640491055, -0.03186174417247197, 0.08931927269960786, 0.17672242104474986, 0.07077660218887363, 0.03810281071595715, -0.1656544554844004, 0.05510562145250982, 0.09039762023725675] |
1,802.06761 | Efficient integrand reduction for particles with spin | Scattering amplitudes with spinning particles are shown to decompose into
multiple copies of simple building blocks to all loop orders, which can be used
to efficiently reduce these amplitudes to sums over scalar integrals. Absence
of unphysical kinematic singularities cleanly exposed by the method uncover
novel consistency relations among master integrals and their coefficients.
Analytic results are obtained for the five gluon, two loop, and four gluon,
three loop planar scattering amplitudes in pure Yang-Mills theory as well as
for leading singularities to even higher orders.
| hep-ph hep-th | scattering amplitudes with spinning particles are shown to decompose into multiple copies of simple building blocks to all loop orders which can be used to efficiently reduce these amplitudes to sums over scalar integrals absence of unphysical kinematic singularities cleanly exposed by the method uncover novel consistency relations among master integrals and their coefficients analytic results are obtained for the five gluon two loop and four gluon three loop planar scattering amplitudes in pure yangmills theory as well as for leading singularities to even higher orders | [['scattering', 'amplitudes', 'with', 'spinning', 'particles', 'are', 'shown', 'to', 'decompose', 'into', 'multiple', 'copies', 'of', 'simple', 'building', 'blocks', 'to', 'all', 'loop', 'orders', 'which', 'can', 'be', 'used', 'to', 'efficiently', 'reduce', 'these', 'amplitudes', 'to', 'sums', 'over', 'scalar', 'integrals', 'absence', 'of', 'unphysical', 'kinematic', 'singularities', 'cleanly', 'exposed', 'by', 'the', 'method', 'uncover', 'novel', 'consistency', 'relations', 'among', 'master', 'integrals', 'and', 'their', 'coefficients', 'analytic', 'results', 'are', 'obtained', 'for', 'the', 'five', 'gluon', 'two', 'loop', 'and', 'four', 'gluon', 'three', 'loop', 'planar', 'scattering', 'amplitudes', 'in', 'pure', 'yangmills', 'theory', 'as', 'well', 'as', 'for', 'leading', 'singularities', 'to', 'even', 'higher', 'orders']] | [-0.12376678793902271, 0.20115283168960624, -0.09610548197443403, 0.12579094108497335, -0.06700334851196858, -0.10930120417588325, -0.004731469989353574, 0.356172802381564, -0.21668259261262623, -0.28189683088296374, 0.0730189447613368, -0.2690726555992178, -0.14354528055721244, 0.20205405727028847, 0.025662976587840985, 0.08496734366189082, 0.031529250706351084, 0.0008445831318927365, -0.06559681573741917, -0.2949920629779267, 0.32937182966879636, -0.07687777793034911, 0.2259158697845631, 0.04185243661320487, 0.10281118884314458, 0.0647811229925516, -0.08554414381424702, 0.022394751696739087, -0.04533593027262277, 0.09827160956690001, 0.29930091504180845, 0.02670996748777323, 0.10085034576179676, -0.4754802612371223, -0.20109767845810153, 0.06595385738453546, 0.22919634092859056, 0.10898754924270433, 0.09783877956486026, -0.2299854050736961, 0.049629213515842374, -0.181810662117895, -0.1938566024317731, -0.16859557400565856, -0.023649151106689904, -0.05310897228069777, -0.28083008137899773, 0.05539186500272779, -0.01697632958868865, -0.033948918219742386, -0.009414556349606015, -0.1531107388653381, -0.04322718388974926, 0.1463890738438728, 0.09002038567911747, 0.020197943979224493, 0.10909959155156515, -0.15689813296397237, -0.18173669358894098, 0.3278455458890084, -0.05599426745496647, -0.21843330171717287, 0.19523398599825625, -0.1844737577999314, -0.12486032576863329, 0.20411122049919742, 0.12711010755819463, 0.12929102606180687, -0.22183220788056768, 0.06707650225279246, 0.06126746917035171, 0.07808882319693301, 0.20658142057377413, 0.07155484317390379, 0.2329785338072323, 0.018721529066042845, -0.020053447928106368, 0.15325239097271764, -0.021572685513515457, -0.14354443193283364, -0.3389497973778837, -0.09766028058000428, -0.04499507617329919, 0.0466037392291392, -0.1587068467982368, -0.19503897715591403, 0.33791912713109756, 0.10045107184563422, 0.1927765357838727, 0.07511685653400152, 0.2988726363279099, 0.15629621952241504, 0.14302946501113692, 0.04069345364303783, 0.2058120486434809, 0.19992462732168564, 0.01378856930031636, -0.20552882359384797, -0.0533784966006182, 0.14770641887213948] |
1,802.06762 | Primordial physics from large-scale structure beyond the power spectrum | We study constraints on primordial mode-coupling from the power spectrum,
squeezed-limit bispectrum and collapsed trispectrum of matter and halos. We
describe these statistics in terms of long-wavelength $2$-point functions
involving the matter/halo density and position-dependent power spectrum. This
allows us to derive simple, analytic expression for the information content,
treating constraints from scale-dependent bias in the halo power spectrum on
the same footing as those from higher order statistics. In particular, we
include non-Gaussian covariance due to long-short mode-coupling from non-linear
evolution, which manifests itself as long-mode cosmic variance in the
position-dependent power spectrum. We find that bispectrum forecasts that
ignore this cosmic variance may underestimate $\sigma(f_{\rm NL})$ by up to a
factor $\sim 3$ for the matter density (at $z=1$) and commonly a factor $\sim
2$ for the halo bispectrum. Constraints from the bispectrum can be improved by
combining it with the power spectrum and trispectrum. The reason is that, in
the position-dependent power spectrum picture, the bispectrum and trispectrum
intrinsically incorporate multitracer cosmic variance cancellation, which is
optimized in a joint analysis. For halo statistics, we discuss the roles of
scale-dependent bias, matter mode-coupling, and non-linear, non-Gaussian
biasing ($b_{11}^{(h)}$). While scale-dependent bias in the halo power spectrum
is already very constraining, higher order halo statistics are competitive in
the regime where stochastic noise in the position-dependent halo power spectrum
is low enough for cosmic variance cancellation to be effective, i.e.~for large
halo number density and large $k_{\rm max}$. This motivates exploring this
regime observationally.
| astro-ph.CO | we study constraints on primordial modecoupling from the power spectrum squeezedlimit bispectrum and collapsed trispectrum of matter and halos we describe these statistics in terms of longwavelength 2point functions involving the matterhalo density and positiondependent power spectrum this allows us to derive simple analytic expression for the information content treating constraints from scaledependent bias in the halo power spectrum on the same footing as those from higher order statistics in particular we include nongaussian covariance due to longshort modecoupling from nonlinear evolution which manifests itself as longmode cosmic variance in the positiondependent power spectrum we find that bispectrum forecasts that ignore this cosmic variance may underestimate sigmaf_rm nl by up to a factor sim 3 for the matter density at z1 and commonly a factor sim 2 for the halo bispectrum constraints from the bispectrum can be improved by combining it with the power spectrum and trispectrum the reason is that in the positiondependent power spectrum picture the bispectrum and trispectrum intrinsically incorporate multitracer cosmic variance cancellation which is optimized in a joint analysis for halo statistics we discuss the roles of scaledependent bias matter modecoupling and nonlinear nongaussian biasing b_11h while scaledependent bias in the halo power spectrum is already very constraining higher order halo statistics are competitive in the regime where stochastic noise in the positiondependent halo power spectrum is low enough for cosmic variance cancellation to be effective iefor large halo number density and large k_rm max this motivates exploring this regime observationally | [['we', 'study', 'constraints', 'on', 'primordial', 'modecoupling', 'from', 'the', 'power', 'spectrum', 'squeezedlimit', 'bispectrum', 'and', 'collapsed', 'trispectrum', 'of', 'matter', 'and', 'halos', 'we', 'describe', 'these', 'statistics', 'in', 'terms', 'of', 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1,802.06763 | Quantum-Assisted Blockchain | Bitcoin and blockchain in general is a hot topic nowadays. In the paper we
propose a quantum empowering of this technology and show how to speed-up the
mining procedure using the modified Grover's algorithm.
| quant-ph cs.CR | bitcoin and blockchain in general is a hot topic nowadays in the paper we propose a quantum empowering of this technology and show how to speedup the mining procedure using the modified grovers algorithm | [['bitcoin', 'and', 'blockchain', 'in', 'general', 'is', 'a', 'hot', 'topic', 'nowadays', 'in', 'the', 'paper', 'we', 'propose', 'a', 'quantum', 'empowering', 'of', 'this', 'technology', 'and', 'show', 'how', 'to', 'speedup', 'the', 'mining', 'procedure', 'using', 'the', 'modified', 'grovers', 'algorithm']] | [-0.08199502861894228, 0.03516328235512928, -0.13479200301363187, 0.05384565687135739, -0.12263409760506715, -0.15554821214583867, 0.09200740380637239, 0.3785395011415376, -0.3145378582617816, -0.32156253764953685, 0.08792649579974, -0.2529164628290078, -0.24373577359844656, 0.20332752740668023, -0.15396058296456056, 0.09383970703107908, 0.05306904630132896, 0.032051106421824765, -0.008609272950493237, -0.3588019488927196, 0.2595521803287899, 0.0673328158822294, 0.33666565586977143, 0.09029023347230737, 0.08169866219053373, -0.016535262947025543, -0.026020308134748656, -0.04433856667567264, -0.09310185227214414, 0.1993927689104834, 0.3037593989454977, 0.23516028264866157, 0.38948095809010896, -0.418574023170068, -0.10280269762391553, 0.08541714728755109, 0.16128261140821612, 0.1656002846053418, -0.12887052232947419, -0.28885220528087197, 0.07972430917160477, -0.2502796225907171, -0.07710323926499661, -0.09581065851756755, -0.01493676406714846, -0.06182244288570741, -0.220367251911632, 0.03650775970891118, 0.056397533619447666, 0.036071874023250794, 0.07965834038879942, 0.0016940863672917819, 0.1331674037501216, 0.06927039775559131, 0.009751442347324508, 0.015259583453264306, 0.15905399271287024, -0.10554015832980547, -0.233173663234886, 0.4165356960147619, -0.05456467139918138, -0.12167480883791167, 0.08328161500942181, -0.018218605587368503, -0.20215856393470483, -0.002382805461392683, 0.2219636854441727, 0.11725718445856781, -0.216954864178072, 0.08148178868749015, -0.037646387868067795, 0.1766414248987156, 0.014516552006277968, 0.0238438357876422, 0.18699292860486927, 0.2539454537224682, 0.07565235921784359, 0.18498455664581237, -0.04941745158986818, -0.1800497599384364, -0.19863036631688694, -0.2259565910927075, -0.1907291594235336, 0.026002555140568054, -0.06513885307204499, -0.1783416414195124, 0.39712045812869773, 0.2556568264742108, 0.11430891356704866, -0.004714896765482777, 0.39825552526642294, 0.053397844107273745, 0.07328401931890231, 0.18474629361127667, 0.16225985952598207, 0.053955294849241484, 0.22848756419604316, -0.19487529610941076, 0.07469185147270122, 0.04540375524255283] |
1,802.06764 | Stability of meanings versus rate of replacement of words: an
experimental test | The words of a language are randomly replaced in time by new ones, but it has
long been known that words corresponding to some items (meanings) are less
frequently replaced than others. Usually, the rate of replacement for a given
item is not directly observable, but it is inferred by the estimated stability
which, on the contrary, is observable. This idea goes back a long way in the
lexicostatistical literature, nevertheless nothing ensures that it gives the
correct answer. The family of Romance languages allows for a direct test of the
estimated stabilities against the replacement rates since the proto-language
(Latin) is known and the replacement rates can be explicitly computed. The
output of the test is threefold:first, we prove that the standard approach
which tries to infer the replacement rates trough the estimated stabilities is
sound; second, we are able to rewrite the fundamental formula of
Glottochronology for a non universal replacement rate (a rate which depends on
the item); third, we give indisputable evidence that the stability ranking is
far from being the same for different families of languages. This last result
is also supported by comparison with the Malagasy family of dialects. As a side
result we also provide some evidence that Vulgar Latin and not Late Classical
Latin is at the root of modern Romance languages.
| cs.CL physics.soc-ph | the words of a language are randomly replaced in time by new ones but it has long been known that words corresponding to some items meanings are less frequently replaced than others usually the rate of replacement for a given item is not directly observable but it is inferred by the estimated stability which on the contrary is observable this idea goes back a long way in the lexicostatistical literature nevertheless nothing ensures that it gives the correct answer the family of romance languages allows for a direct test of the estimated stabilities against the replacement rates since the protolanguage latin is known and the replacement rates can be explicitly computed the output of the test is threefoldfirst we prove that the standard approach which tries to infer the replacement rates trough the estimated stabilities is sound second we are able to rewrite the fundamental formula of glottochronology for a non universal replacement rate a rate which depends on the item third we give indisputable evidence that the stability ranking is far from being the same for different families of languages this last result is also supported by comparison with the malagasy family of dialects as a side result we also provide some evidence that vulgar latin and not late classical latin is at the root of modern romance languages | [['the', 'words', 'of', 'a', 'language', 'are', 'randomly', 'replaced', 'in', 'time', 'by', 'new', 'ones', 'but', 'it', 'has', 'long', 'been', 'known', 'that', 'words', 'corresponding', 'to', 'some', 'items', 'meanings', 'are', 'less', 'frequently', 'replaced', 'than', 'others', 'usually', 'the', 'rate', 'of', 'replacement', 'for', 'a', 'given', 'item', 'is', 'not', 'directly', 'observable', 'but', 'it', 'is', 'inferred', 'by', 'the', 'estimated', 'stability', 'which', 'on', 'the', 'contrary', 'is', 'observable', 'this', 'idea', 'goes', 'back', 'a', 'long', 'way', 'in', 'the', 'lexicostatistical', 'literature', 'nevertheless', 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1,802.06765 | Interpretable VAEs for nonlinear group factor analysis | Deep generative models have recently yielded encouraging results in producing
subjectively realistic samples of complex data. Far less attention has been
paid to making these generative models interpretable. In many scenarios,
ranging from scientific applications to finance, the observed variables have a
natural grouping. It is often of interest to understand systems of interaction
amongst these groups, and latent factor models (LFMs) are an attractive
approach. However, traditional LFMs are limited by assuming a linear
correlation structure. We present an output interpretable VAE (oi-VAE) for
grouped data that models complex, nonlinear latent-to-observed relationships.
We combine a structured VAE comprised of group-specific generators with a
sparsity-inducing prior. We demonstrate that oi-VAE yields meaningful notions
of interpretability in the analysis of motion capture and MEG data. We further
show that in these situations, the regularization inherent to oi-VAE can
actually lead to improved generalization and learned generative processes.
| cs.LG stat.ML | deep generative models have recently yielded encouraging results in producing subjectively realistic samples of complex data far less attention has been paid to making these generative models interpretable in many scenarios ranging from scientific applications to finance the observed variables have a natural grouping it is often of interest to understand systems of interaction amongst these groups and latent factor models lfms are an attractive approach however traditional lfms are limited by assuming a linear correlation structure we present an output interpretable vae oivae for grouped data that models complex nonlinear latenttoobserved relationships we combine a structured vae comprised of groupspecific generators with a sparsityinducing prior we demonstrate that oivae yields meaningful notions of interpretability in the analysis of motion capture and meg data we further show that in these situations the regularization inherent to oivae can actually lead to improved generalization and learned generative processes | [['deep', 'generative', 'models', 'have', 'recently', 'yielded', 'encouraging', 'results', 'in', 'producing', 'subjectively', 'realistic', 'samples', 'of', 'complex', 'data', 'far', 'less', 'attention', 'has', 'been', 'paid', 'to', 'making', 'these', 'generative', 'models', 'interpretable', 'in', 'many', 'scenarios', 'ranging', 'from', 'scientific', 'applications', 'to', 'finance', 'the', 'observed', 'variables', 'have', 'a', 'natural', 'grouping', 'it', 'is', 'often', 'of', 'interest', 'to', 'understand', 'systems', 'of', 'interaction', 'amongst', 'these', 'groups', 'and', 'latent', 'factor', 'models', 'lfms', 'are', 'an', 'attractive', 'approach', 'however', 'traditional', 'lfms', 'are', 'limited', 'by', 'assuming', 'a', 'linear', 'correlation', 'structure', 'we', 'present', 'an', 'output', 'interpretable', 'vae', 'oivae', 'for', 'grouped', 'data', 'that', 'models', 'complex', 'nonlinear', 'latenttoobserved', 'relationships', 'we', 'combine', 'a', 'structured', 'vae', 'comprised', 'of', 'groupspecific', 'generators', 'with', 'a', 'sparsityinducing', 'prior', 'we', 'demonstrate', 'that', 'oivae', 'yields', 'meaningful', 'notions', 'of', 'interpretability', 'in', 'the', 'analysis', 'of', 'motion', 'capture', 'and', 'meg', 'data', 'we', 'further', 'show', 'that', 'in', 'these', 'situations', 'the', 'regularization', 'inherent', 'to', 'oivae', 'can', 'actually', 'lead', 'to', 'improved', 'generalization', 'and', 'learned', 'generative', 'processes']] | [-0.008652417593764077, 0.04439345964507585, -0.09200530107422121, 0.14015521594917338, -0.14184784637442951, -0.15775843728654856, 0.004437916839880676, 0.4773769393595385, -0.282942592705889, -0.3448735556725798, 0.03776028681353762, -0.28051038846887394, -0.20863830043998516, 0.19776783561141326, -0.13546563772783726, 0.07895515816414665, 0.09887867797294568, 0.014219841756055068, -0.050155753406679965, -0.25088094475293726, 0.2923305944138174, 0.0407147294020778, 0.3109439685491138, -0.04523868925933694, 0.11400284571813997, -0.059400671865020335, -0.05302403909635955, 0.00674858984441079, -0.07415835075637382, 0.20252392086489449, 0.3189830424441707, 0.18193704769625488, 0.3197287106838334, -0.4383185947185447, -0.31728198204976343, 0.12396780835175565, 0.1276954990622973, 0.07943217374448633, -0.03722017181651859, -0.3195548230653693, 0.04898745070115246, -0.18238399961786667, -0.011883353152922516, -0.20840287684816225, -0.00679848801730008, -0.005212850000805639, -0.31790951230796055, 0.06002331406263442, 0.09223234502895702, 0.05875183455686181, -0.038722917360478434, -0.15050265783090785, -0.00750352405975091, 0.12377092571415264, 0.07984479683579813, -0.006127721819512803, 0.08469247771427035, -0.18545660693840735, -0.12909657790060636, 0.3416860745834379, -0.004741461385555309, -0.21718206934245496, 0.2416823345670027, -0.06891672935593744, -0.1990717250356001, 0.11309047951844746, 0.23862440794874945, 0.07350599963763921, -0.18190180662866876, 0.035661773719616104, -0.047477744561459485, 0.16425562971673008, 0.020086994224452766, 0.03294574371699629, 0.17622369034215807, 0.22357021399356167, -0.01907502099719091, 0.11308266203930795, -0.05047816162555607, -0.10673155596335258, -0.18850860934190708, -0.06556028483820886, -0.1467622960724964, 0.006459812472317496, -0.10581849572250764, -0.13412727069527167, 0.36111081526775296, 0.22168506648841088, 0.22680281594652554, 0.05705450543619949, 0.2748245960037256, 0.06850446610599115, 0.1252835625108203, 0.035811373705429764, 0.20338476698620822, 0.07902976607357891, 0.05711475327482511, -0.09569349269270255, 0.12067014476412843, -0.039358921766538046] |
1,802.06766 | Characterization of the formation structure in team sports | We propose a method to identify the formation structure in team sports based
on Delaunay triangulation. The adjacency matrix obtained from the Delaunay
triangulation for each player is regarded as the formation pattern. Our method
allows time-series analysis and a quantitative comparison of formations. A
classification algorithm of formations is also proposed by combining our method
with hierarchical clustering.
| physics.soc-ph | we propose a method to identify the formation structure in team sports based on delaunay triangulation the adjacency matrix obtained from the delaunay triangulation for each player is regarded as the formation pattern our method allows timeseries analysis and a quantitative comparison of formations a classification algorithm of formations is also proposed by combining our method with hierarchical clustering | [['we', 'propose', 'a', 'method', 'to', 'identify', 'the', 'formation', 'structure', 'in', 'team', 'sports', 'based', 'on', 'delaunay', 'triangulation', 'the', 'adjacency', 'matrix', 'obtained', 'from', 'the', 'delaunay', 'triangulation', 'for', 'each', 'player', 'is', 'regarded', 'as', 'the', 'formation', 'pattern', 'our', 'method', 'allows', 'timeseries', 'analysis', 'and', 'a', 'quantitative', 'comparison', 'of', 'formations', 'a', 'classification', 'algorithm', 'of', 'formations', 'is', 'also', 'proposed', 'by', 'combining', 'our', 'method', 'with', 'hierarchical', 'clustering']] | [-0.0459219830710504, -0.06610281058287217, -0.18088450196783168, 0.03405222336572232, -0.0847158169500151, -0.10539735892345592, 0.03952945069551973, 0.4157326317439645, -0.2793598191465362, -0.3379623636098231, 0.09448611631918447, -0.2555107810907954, -0.2467794494103577, 0.11851834269019507, -0.08682001863558919, 0.03029860164654457, 0.14666743598625823, 0.04447092015643494, -0.000894443905454571, -0.23632461953734568, 0.2951769281841688, 0.05277511016544649, 0.2997140766642356, -0.023759867080439954, 0.09602803845842511, 0.03344007892143455, -0.07709341134749732, 0.09374581533089532, -0.15047737711377568, 0.15166454983606809, 0.2118974096315392, 0.18559415337740112, 0.24634023210017988, -0.3455424450843011, -0.19641720546188496, 0.05760096715984203, 0.13585667852292596, 0.11105612187914676, -0.07794984794119215, -0.3273930078593351, 0.11602664454958513, -0.11898504778490228, -0.06491832527474074, -0.0928699981334414, -0.032203153588698574, 0.0015039389037479788, -0.32270887987865765, 0.053146378658573794, 0.0167166723996022, 0.040141213006513604, -0.0580267949292231, -0.09712381716186212, -0.024469510249604108, 0.14437800221208294, -0.06433096497272284, 0.051936777277013006, 0.1114162624403203, -0.05629816112282165, -0.21120956767413576, 0.4409475173501266, -0.022918305470276686, -0.1776703078678604, 0.17111357346066605, -0.07812983379304661, -0.16786359207136398, 0.10124564420242431, 0.17337326206645723, 0.16119833145353754, -0.12221241922421633, -0.019225582520879993, -0.0901294352281523, 0.1654763472092859, 0.061380405452544404, -0.07558361617690426, 0.18766539063999207, 0.32585456680064484, 0.14861639383864605, 0.14124625501562288, -0.11600904340729497, -0.09235758759018223, -0.23023881862666143, -0.10562415395752858, -0.21462472412987785, -0.03600966674473011, -0.1814528057207176, -0.20305196644138482, 0.42140100669052644, 0.12766759099154654, 0.21021756553485738, 0.08081889662386502, 0.30703513469483895, -0.0038003618414592694, 0.08633983462370175, 0.049218910517392016, 0.13144164958621485, 0.1364015198541584, 0.06533531163487646, -0.21995870921745012, 0.11148469694653305, 0.2021084269193017] |
1,802.06767 | The problem of the development ontology-driven architecture of
intellectual software systems | The paper describes the architecture of the intelligence system for automated
design of ontological knowledge bases of domain areas and the software model of
the management GUI (Graphical User Interface) subsystem
| cs.AI | the paper describes the architecture of the intelligence system for automated design of ontological knowledge bases of domain areas and the software model of the management gui graphical user interface subsystem | [['the', 'paper', 'describes', 'the', 'architecture', 'of', 'the', 'intelligence', 'system', 'for', 'automated', 'design', 'of', 'ontological', 'knowledge', 'bases', 'of', 'domain', 'areas', 'and', 'the', 'software', 'model', 'of', 'the', 'management', 'gui', 'graphical', 'user', 'interface', 'subsystem']] | [-0.1591957826167345, -0.054694393649697304, -0.05175878720418099, 0.008296775871947888, -0.1558329027686869, -0.2018323463778342, 0.011690443655806444, 0.357340685782894, -0.2783290088296898, -0.37333387785380884, 0.06257877162387294, -0.21643675435259338, -0.18501398538149172, 0.14263908050563787, -0.11889890569352335, 0.09511946820684018, 0.10834948203316139, 0.033290971693913304, 0.018248141623072086, -0.17325297634928458, 0.34756424470293906, 0.05666172578029575, 0.3843598892131159, 0.029285373857184764, 0.10212861800626401, 0.0642591182728328, -0.06306813182609697, -0.09658473243396129, -0.10042715318981678, 0.25101582865200694, 0.3881966429612329, 0.3334516961007349, 0.3178946649084889, -0.43404282341080325, -0.15912233241983958, -0.03815954387368214, 0.1355079260444449, 0.05752830411637983, 0.028681753680200105, -0.3546218706234809, 0.01674261208503477, -0.2685042290738033, -0.1054402562158723, -0.02816023539391256, -0.0302351085889724, -0.026995000129024827, -0.24590787537876638, -0.08516231347476283, 0.1282579224076002, 0.19988171107346012, -0.057794067708234635, -0.12873350511560397, -0.0029222445802823188, 0.21759000665418082, -0.023655013673217786, 0.0034294515818117126, 0.21213543162711204, -0.14899212698782643, -0.16289043871145095, 0.3450399693702498, 0.0790409809954825, -0.20150743352790032, 0.16706036908491964, -0.00614067695794567, -0.13494311885968333, 0.0574771684985007, 0.2543767900957215, -0.004027537701110686, -0.2854072271185296, 0.13601612576636515, 0.058839112520217896, 0.2473995083522412, -0.015037322619689568, -0.010716440080995522, 0.24220384597297637, 0.2767440040385531, 0.03004952595238724, 0.15092855992336426, -0.018163694429301446, -0.10006231541234639, -0.30967824581649994, -0.27051815588868433, -0.19686915982334363, -0.13817470076103364, -0.10042353919209657, -0.22536279994153208, 0.44172698583814407, 0.23082754226221192, -0.042821396983438925, 0.0374248601015537, 0.34516214723548583, -0.013680374430071923, 0.065458158031106, 0.09438666614193109, 0.08358696911243661, -0.0034650942130434897, 0.25990576453266606, -0.1867082167056299, 0.15122393488643632, 0.04038640081642136] |
1,802.06768 | Design and software implementation of subsystems for creating and using
the ontological base of a research scientist | Creation of the information systems and tools for scientific research and
development support has always been one of the central directions of the
development of computer science. The main features of the modern evolution of
scientific research and development are the transdisciplinary approach and the
deep intellectualisation of all stages of the life cycle of formulation and
solution of scientific problems. The theoretical and practical aspects of the
development of perspective complex knowledge-oriented information systems and
their components are considered in the paper. The analysis of existing
scientific information systems (or current research information systems, CRIS)
and synthesis of general principles of design of the research and development
workstation environment of a researcher and its components are carried out in
the work. The functional components of knowledge-oriented information system
research and development workstation environment of a researcher are designed.
Designed and developed functional components of knowledge-oriented information
system developing research and development workstation environment,including
functional models and software implementation of the software subsystem for
creation and use of ontological knowledge base for research fellow
publications, as part of personalized knowledge base of scientific researcher.
Research in modern conditions of e-Science paradigm requires pooling scientific
community and intensive exchange of research results that may be achieved
through the use of scientific information systems. research and development
workstation environment allows to solve problems of contructivisation and
formalisation of knowledge representation, obtained during the research process
and collective accomplices interaction.
| cs.AI | creation of the information systems and tools for scientific research and development support has always been one of the central directions of the development of computer science the main features of the modern evolution of scientific research and development are the transdisciplinary approach and the deep intellectualisation of all stages of the life cycle of formulation and solution of scientific problems the theoretical and practical aspects of the development of perspective complex knowledgeoriented information systems and their components are considered in the paper the analysis of existing scientific information systems or current research information systems cris and synthesis of general principles of design of the research and development workstation environment of a researcher and its components are carried out in the work the functional components of knowledgeoriented information system research and development workstation environment of a researcher are designed designed and developed functional components of knowledgeoriented information system developing research and development workstation environmentincluding functional models and software implementation of the software subsystem for creation and use of ontological knowledge base for research fellow publications as part of personalized knowledge base of scientific researcher research in modern conditions of escience paradigm requires pooling scientific community and intensive exchange of research results that may be achieved through the use of scientific information systems research and development workstation environment allows to solve problems of contructivisation and formalisation of knowledge representation obtained during the research process and collective accomplices interaction | [['creation', 'of', 'the', 'information', 'systems', 'and', 'tools', 'for', 'scientific', 'research', 'and', 'development', 'support', 'has', 'always', 'been', 'one', 'of', 'the', 'central', 'directions', 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1,802.06769 | Technique for designing a domain ontology | The article describes the technique for designing a domain ontology, shows
the flowchart of algorithm design and example of constructing a fragment of the
ontology of the subject area of Computer Science is considered.
| cs.AI | the article describes the technique for designing a domain ontology shows the flowchart of algorithm design and example of constructing a fragment of the ontology of the subject area of computer science is considered | [['the', 'article', 'describes', 'the', 'technique', 'for', 'designing', 'a', 'domain', 'ontology', 'shows', 'the', 'flowchart', 'of', 'algorithm', 'design', 'and', 'example', 'of', 'constructing', 'a', 'fragment', 'of', 'the', 'ontology', 'of', 'the', 'subject', 'area', 'of', 'computer', 'science', 'is', 'considered']] | [-0.13917507231235504, -0.01593432093367857, -0.09580317731974099, 0.031415322812630195, -0.07876879623269334, -0.0932603438713533, 0.022754711153752664, 0.3297991209170398, -0.23671535347752712, -0.3705535669098882, 0.07752353410400889, -0.19072951069649527, -0.18801551969612346, 0.2528572763480684, -0.07014190876746879, 0.07403652956161429, 0.0705869350965847, 0.06444371853242903, 0.003910412874949329, -0.18918310346848824, 0.3152751561035128, 0.051077233915052866, 0.31498643525821324, 0.04303946666529074, 0.10783504871377612, 0.018321638611857507, -0.110770993592108, 0.03666864204056123, -0.13293503438506057, 0.23496177170754357, 0.3290408854646718, 0.303269807180828, 0.350521536092, -0.3658250684795134, -0.16014843672404394, 0.029234567410586512, 0.12209844720714233, 0.13848250107291868, -0.0842589053688297, -0.26092012415585275, 0.05349135704283767, -0.1851411660147064, -0.13101911878980257, -0.010312951786224456, 0.018743213540052667, -0.0009632593513849904, -0.25312991760780706, -0.03946961503585472, 0.1434083016424933, 0.10179947234471054, -0.0576126978130025, -0.10894369758555994, 0.06553734938942772, 0.12003349767559592, -0.03473075685392627, 0.08335715793894932, 0.1378532751901623, -0.14376654099289546, -0.13715634894940784, 0.4088625086690573, 0.05426911056479987, -0.18441054679672508, 0.0984753207577502, -0.01719640225500745, -0.14313701419707606, 0.05831333961995209, 0.1796611088382847, 0.11399101444027003, -0.18879975145682693, 0.14708004619152396, -0.005450996563441175, 0.1917214495513369, 0.04034983634483069, -0.027346081155187944, 0.2184838392662213, 0.34045033677316766, 0.047193318714990336, 0.24840869524461381, -0.048876933096086275, -0.11559444902163438, -0.326361443299581, -0.22704961638459387, -0.19476632415727876, -0.03526317166602787, -0.011337627026317505, -0.20427354353973093, 0.41482664568021016, 0.1535917466835064, 0.059839204720714516, 0.0387082216603791, 0.2839033121571821, 0.05445378601058003, 0.06387211163254346, 0.024023979176383686, 0.13895906727103627, 0.08762825904961895, 0.1585468394572244, -0.18486210112870835, 0.08750051399692893, 0.06999109907294898] |
1,802.0677 | Achieving perfect coordination amongst agents in the co-action minority
game | We discuss the strategy that rational agents can use to maximize their
expected long-term payoff in the co-action minority game. We argue that the
agents will try to get into a cyclic state, where each of the $(2N +1)$ agent
wins exactly $N$ times in any continuous stretch of $(2N+1)$ days. We propose
and analyse a strategy for reaching such a cyclic state quickly, when any
direct communication between agents is not allowed, and only the publicly
available common information is the record of total number of people choosing
the first restaurant in the past. We determine exactly the average time
required to reach the periodic state for this strategy. We show that it varies
as $(N/\ln 2) [1 + \alpha \cos (2 \pi \log_2 N)$], for large $N$, where the
amplitude $\alpha$ of the leading term in the log-periodic oscillations is
found be $\frac{8 \pi^2}{(\ln 2)^2} \exp{(- 2 \pi^2/\ln 2)} \approx
{\color{blue}7 \times 10^{-11}}$.
| econ.EM q-fin.EC | we discuss the strategy that rational agents can use to maximize their expected longterm payoff in the coaction minority game we argue that the agents will try to get into a cyclic state where each of the 2n 1 agent wins exactly n times in any continuous stretch of 2n1 days we propose and analyse a strategy for reaching such a cyclic state quickly when any direct communication between agents is not allowed and only the publicly available common information is the record of total number of people choosing the first restaurant in the past we determine exactly the average time required to reach the periodic state for this strategy we show that it varies as nln 2 1 alpha cos 2 pi log_2 n for large n where the amplitude alpha of the leading term in the logperiodic oscillations is found be frac8 pi2ln 22 exp 2 pi2ln 2 approx colorblue7 times 1011 | [['we', 'discuss', 'the', 'strategy', 'that', 'rational', 'agents', 'can', 'use', 'to', 'maximize', 'their', 'expected', 'longterm', 'payoff', 'in', 'the', 'coaction', 'minority', 'game', 'we', 'argue', 'that', 'the', 'agents', 'will', 'try', 'to', 'get', 'into', 'a', 'cyclic', 'state', 'where', 'each', 'of', 'the', '2n', '1', 'agent', 'wins', 'exactly', 'n', 'times', 'in', 'any', 'continuous', 'stretch', 'of', '2n1', 'days', 'we', 'propose', 'and', 'analyse', 'a', 'strategy', 'for', 'reaching', 'such', 'a', 'cyclic', 'state', 'quickly', 'when', 'any', 'direct', 'communication', 'between', 'agents', 'is', 'not', 'allowed', 'and', 'only', 'the', 'publicly', 'available', 'common', 'information', 'is', 'the', 'record', 'of', 'total', 'number', 'of', 'people', 'choosing', 'the', 'first', 'restaurant', 'in', 'the', 'past', 'we', 'determine', 'exactly', 'the', 'average', 'time', 'required', 'to', 'reach', 'the', 'periodic', 'state', 'for', 'this', 'strategy', 'we', 'show', 'that', 'it', 'varies', 'as', 'nln', '2', '1', 'alpha', 'cos', '2', 'pi', 'log_2', 'n', 'for', 'large', 'n', 'where', 'the', 'amplitude', 'alpha', 'of', 'the', 'leading', 'term', 'in', 'the', 'logperiodic', 'oscillations', 'is', 'found', 'be', 'frac8', 'pi2ln', '22', 'exp', '2', 'pi2ln', '2', 'approx', 'colorblue7', 'times', '1011']] | [-0.15380137360344331, 0.17477493951718012, -0.04605714295990765, 0.052435347855401535, -0.03959724593286713, -0.19497189838128784, 0.1033760101099809, 0.3753337970251838, -0.27242688233653706, -0.3011833501358827, 0.08797651330241933, -0.2967825896479189, -0.11433421114925295, 0.1035208486703535, -0.055463191516076524, -0.023855350812276205, 0.021962821980317435, 0.13416111698374153, -0.012841428307195505, -0.30660672567784786, 0.2502622208337804, -0.0032593144538501898, 0.19410596632088223, -0.0034202200391640265, 0.11237471831807246, 0.01946408668765798, 0.005993466206515829, -0.027149259798849624, -0.1715270708889875, 0.024146519666537643, 0.2653123470644156, 0.16380099599870543, 0.317513816151768, -0.42361513067036866, -0.10680171306322639, 0.18780755954173703, 0.15875263780743504, 0.07567239878543963, 0.06320349822752178, -0.21111246444905798, 0.11004367358817642, -0.18526864785235375, -0.1227595432040592, -0.020930421317461877, 0.09416868480543296, 0.00679455257486552, -0.3066551480970035, 0.011383633574005216, 0.02212221422077467, 0.01518773324166735, -0.031007821395566376, -0.1531082913838327, -0.008754401563201099, 0.18405538517613118, 0.03136090898420662, 0.06635663951009822, 0.09728345629759133, -0.11792655226929734, -0.11101334281886617, 0.3588247027123968, -0.059393358027252055, -0.12431841206736863, 0.10797511956654489, -0.16816691619654497, -0.11765623914834578, 0.14036453012377023, 0.13917134165084766, 0.1282515743530045, -0.0850737337943671, 0.06037250032570834, -0.044322738528717306, 0.25381817234214393, 0.06325441323841612, 0.013426109130183855, 0.13592048278078436, 0.13792811448841044, 0.12494488338163744, 0.06640092181274668, -0.07470063313220938, -0.07146752335131168, -0.28861577627093843, -0.16504867361237605, -0.17330849508754909, 0.11988688523580397, -0.1237355594294301, -0.08026031342024605, 0.3518809703799585, 0.1506052140519023, 0.20869955595582723, 0.11052942816711342, 0.2649000244983472, 0.0946742849665073, 0.029954243965136507, 0.11976167029701174, 0.20438037395942957, 0.00868754340452142, 0.06943205760171016, -0.21319041880468528, 0.06640042109492546, 0.018187542079637447] |
1,802.06771 | Bayes-optimal Hierarchical Classification over Asymmetric Tree-Distance
Loss | Hierarchical classification is supervised multi-class classification problem
over the set of class labels organized according to a hierarchy. In this
report, we study the work by Ramaswamy et. al. on hierarchical classification
over symmetric tree distance loss. We extend the consistency of hierarchical
classification algorithm over asymmetric tree distance loss. We design a
$\mathcal{O}(nk\log{}n)$ algorithm to find Bayes optimal classification for a
k-ary tree as a hierarchy. We show that under reasonable assumptions over
asymmetric loss function, the Bayes optimal classification over this asymmetric
loss can be found in $\mathcal{O}(k\log{}n)$. We exploit this insight and
attempt to extend the Ova-Cascade algorithm \citet{ramaswamy2015convex} for
hierarchical classification over the asymmetric loss.
| cs.LG cs.AI | hierarchical classification is supervised multiclass classification problem over the set of class labels organized according to a hierarchy in this report we study the work by ramaswamy et al on hierarchical classification over symmetric tree distance loss we extend the consistency of hierarchical classification algorithm over asymmetric tree distance loss we design a mathcalonklogn algorithm to find bayes optimal classification for a kary tree as a hierarchy we show that under reasonable assumptions over asymmetric loss function the bayes optimal classification over this asymmetric loss can be found in mathcaloklogn we exploit this insight and attempt to extend the ovacascade algorithm citetramaswamy2015convex for hierarchical classification over the asymmetric loss | [['hierarchical', 'classification', 'is', 'supervised', 'multiclass', 'classification', 'problem', 'over', 'the', 'set', 'of', 'class', 'labels', 'organized', 'according', 'to', 'a', 'hierarchy', 'in', 'this', 'report', 'we', 'study', 'the', 'work', 'by', 'ramaswamy', 'et', 'al', 'on', 'hierarchical', 'classification', 'over', 'symmetric', 'tree', 'distance', 'loss', 'we', 'extend', 'the', 'consistency', 'of', 'hierarchical', 'classification', 'algorithm', 'over', 'asymmetric', 'tree', 'distance', 'loss', 'we', 'design', 'a', 'mathcalonklogn', 'algorithm', 'to', 'find', 'bayes', 'optimal', 'classification', 'for', 'a', 'kary', 'tree', 'as', 'a', 'hierarchy', 'we', 'show', 'that', 'under', 'reasonable', 'assumptions', 'over', 'asymmetric', 'loss', 'function', 'the', 'bayes', 'optimal', 'classification', 'over', 'this', 'asymmetric', 'loss', 'can', 'be', 'found', 'in', 'mathcaloklogn', 'we', 'exploit', 'this', 'insight', 'and', 'attempt', 'to', 'extend', 'the', 'ovacascade', 'algorithm', 'citetramaswamy2015convex', 'for', 'hierarchical', 'classification', 'over', 'the', 'asymmetric', 'loss']] | [-0.07441316929956278, -0.03252382175109926, -0.08833475619377125, 0.12109165875285509, -0.12047075441195851, -0.12112771824357055, 0.13176339999550865, 0.4781377479079224, -0.3102998638059944, -0.34682133045224917, 0.06878151006420098, -0.18648186691460156, -0.21973361702901975, 0.14399872790312485, -0.13114860435681683, 0.06632767273556618, 0.13432633977028585, 0.06130463424183073, -0.11839966505455474, -0.3384275051809493, 0.3404887538669365, 0.06127525647836072, 0.3313135725933881, 0.004192329186480492, 0.125926103114727, 0.07065342788673228, -0.04329879202303432, 0.007013493915396143, -0.11384629261315457, 0.13799045420185263, 0.2549369457576956, 0.1719861334855003, 0.2853555715155034, -0.2647113370576075, -0.23218292882222505, 0.15527767634374046, 0.16342464331537485, 0.10401671947467894, -0.0009150286304897495, -0.24858615047165325, 0.11572550235404855, -0.2432489848740044, -0.011203178674692199, -0.09412540858611465, -0.02851351283135868, -0.02239926752989136, -0.32390624542853663, 0.08769725033392509, 0.11616539106138848, 0.01373399058800368, -0.08404947128590373, -0.12557316157257273, 0.04856297236512459, 0.048548610517311665, -0.055817689154563206, 0.03995035384515566, 0.05347358981324803, -0.09891131190538761, -0.1870022811527763, 0.28563498560161815, -0.06430298056276072, -0.2132801899775153, 0.17414310474303507, -0.013448658412588493, -0.1576581463971663, 0.09903737803300222, 0.3041794627195313, 0.10452842048945882, -0.1583279260744651, 0.03925199147613187, -0.12932733972335145, 0.12497019488253586, 0.11970410235891385, -0.05027479874857125, 0.17320170473484767, 0.2808474884590223, 0.11313471711639847, 0.17805254173664642, -0.08951002447200673, -0.09267576322946254, -0.23973854896390723, -0.09877044280902261, -0.13830600813740776, 0.02572878280743247, -0.1068528091577935, -0.17440966140656244, 0.39159813304209995, 0.1587131314068323, 0.2618940948730423, 0.17527102115785792, 0.2541587175712699, 0.04866422685985786, 0.06898484452561077, 0.13087923453145084, 0.1588820740403164, 0.09056003015222294, 0.03234667069988237, -0.1971844555233561, 0.08817614537796804, 0.08255709614604712] |
1,802.06772 | Connectivity-Driven Parcellation Methods for the Human Cerebral Cortex | In this thesis, we present robust and fully-automated methods for the
subdivision of the entire human cerebral cortex based on connectivity
information. Our contributions are four-fold: First, we propose a clustering
approach to delineate a cortical parcellation that provides a reliable
abstraction of the brain's functional organisation. Second, we cast the
parcellation problem as a feature reduction problem and make use of manifold
learning and image segmentation techniques to identify cortical regions with
distinct structural connectivity patterns. Third, we present a multi-layer
graphical model that combines within- and between-subject connectivity, which
is then decomposed into a cortical parcellation that can represent the whole
population, while accounting for the variability across subjects. Finally, we
conduct a large-scale, systematic comparison of existing parcellation methods,
with a focus on providing some insight into the reliability of brain
parcellations in terms of reflecting the underlying connectivity, as well as,
revealing their impact on network analysis.
We evaluate the proposed parcellation methods on publicly available data from
the Human Connectome Project and a plethora of quantitative and qualitative
evaluation techniques investigated in the literature. Experiments across
multiple resolutions demonstrate the accuracy of the presented methods at both
subject and group levels with regards to reproducibility and fidelity to the
data. The neuro-biological interpretation of the proposed parcellations is also
investigated by comparing parcel boundaries with well-structured properties of
the cerebral cortex. Results show the advantage of connectivity-driven
parcellations over traditional approaches in terms of better fitting the
underlying connectivity.
| q-bio.NC cs.CV | in this thesis we present robust and fullyautomated methods for the subdivision of the entire human cerebral cortex based on connectivity information our contributions are fourfold first we propose a clustering approach to delineate a cortical parcellation that provides a reliable abstraction of the brains functional organisation second we cast the parcellation problem as a feature reduction problem and make use of manifold learning and image segmentation techniques to identify cortical regions with distinct structural connectivity patterns third we present a multilayer graphical model that combines within and betweensubject connectivity which is then decomposed into a cortical parcellation that can represent the whole population while accounting for the variability across subjects finally we conduct a largescale systematic comparison of existing parcellation methods with a focus on providing some insight into the reliability of brain parcellations in terms of reflecting the underlying connectivity as well as revealing their impact on network analysis we evaluate the proposed parcellation methods on publicly available data from the human connectome project and a plethora of quantitative and qualitative evaluation techniques investigated in the literature experiments across multiple resolutions demonstrate the accuracy of the presented methods at both subject and group levels with regards to reproducibility and fidelity to the data the neurobiological interpretation of the proposed parcellations is also investigated by comparing parcel boundaries with wellstructured properties of the cerebral cortex results show the advantage of connectivitydriven parcellations over traditional approaches in terms of better fitting the underlying connectivity | [['in', 'this', 'thesis', 'we', 'present', 'robust', 'and', 'fullyautomated', 'methods', 'for', 'the', 'subdivision', 'of', 'the', 'entire', 'human', 'cerebral', 'cortex', 'based', 'on', 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1,802.06773 | Fundamental Frequencies in the Schwarzschild Spacetime | We consider the Keplerian, radial and vertical fundamental frequencies in the
Schwarzschild spacetime to study the so-called kilohertz quasi-periodic
oscillations from low-mass X-ray binary systems. We show that, within the
Relativistic Precession Model, the interpretation of observed kilohertz
quasi-periodic oscillations in terms of the fundamental frequencies of test
particles in the Schwarzschild spacetime, allows one to infer the total mass
$M$ of the central object, the internal $R_{in}$ and external $R_{ex}$ radii of
accretion disks, and innermost stable circular orbits $r_{ISCO}$ for test
particles in a low-mass X-ray binary system. By constructing the relation
between the upper and lower frequencies and exploiting the quasi-periodic
oscillation data of the Z and Atoll sources we perform the non-linear model fit
analysis and estimate the mass of the central object. Knowing the value of the
mass we calculate the internal $R_{in}$ and external $R_{ex}$ radii of
accretion disks and show that they are larger than $r_{ISCO}$, what was
expected.
| astro-ph.HE gr-qc | we consider the keplerian radial and vertical fundamental frequencies in the schwarzschild spacetime to study the socalled kilohertz quasiperiodic oscillations from lowmass xray binary systems we show that within the relativistic precession model the interpretation of observed kilohertz quasiperiodic oscillations in terms of the fundamental frequencies of test particles in the schwarzschild spacetime allows one to infer the total mass m of the central object the internal r_in and external r_ex radii of accretion disks and innermost stable circular orbits r_isco for test particles in a lowmass xray binary system by constructing the relation between the upper and lower frequencies and exploiting the quasiperiodic oscillation data of the z and atoll sources we perform the nonlinear model fit analysis and estimate the mass of the central object knowing the value of the mass we calculate the internal r_in and external r_ex radii of accretion disks and show that they are larger than r_isco what was expected | [['we', 'consider', 'the', 'keplerian', 'radial', 'and', 'vertical', 'fundamental', 'frequencies', 'in', 'the', 'schwarzschild', 'spacetime', 'to', 'study', 'the', 'socalled', 'kilohertz', 'quasiperiodic', 'oscillations', 'from', 'lowmass', 'xray', 'binary', 'systems', 'we', 'show', 'that', 'within', 'the', 'relativistic', 'precession', 'model', 'the', 'interpretation', 'of', 'observed', 'kilohertz', 'quasiperiodic', 'oscillations', 'in', 'terms', 'of', 'the', 'fundamental', 'frequencies', 'of', 'test', 'particles', 'in', 'the', 'schwarzschild', 'spacetime', 'allows', 'one', 'to', 'infer', 'the', 'total', 'mass', 'm', 'of', 'the', 'central', 'object', 'the', 'internal', 'r_in', 'and', 'external', 'r_ex', 'radii', 'of', 'accretion', 'disks', 'and', 'innermost', 'stable', 'circular', 'orbits', 'r_isco', 'for', 'test', 'particles', 'in', 'a', 'lowmass', 'xray', 'binary', 'system', 'by', 'constructing', 'the', 'relation', 'between', 'the', 'upper', 'and', 'lower', 'frequencies', 'and', 'exploiting', 'the', 'quasiperiodic', 'oscillation', 'data', 'of', 'the', 'z', 'and', 'atoll', 'sources', 'we', 'perform', 'the', 'nonlinear', 'model', 'fit', 'analysis', 'and', 'estimate', 'the', 'mass', 'of', 'the', 'central', 'object', 'knowing', 'the', 'value', 'of', 'the', 'mass', 'we', 'calculate', 'the', 'internal', 'r_in', 'and', 'external', 'r_ex', 'radii', 'of', 'accretion', 'disks', 'and', 'show', 'that', 'they', 'are', 'larger', 'than', 'r_isco', 'what', 'was', 'expected']] | [-0.14666410312295342, 0.1550420759102473, -0.046702330839485884, 0.12979890937164712, -0.07071277942174138, -0.07825336020547323, 0.044527699012691394, 0.33992081998178786, -0.1836335127038929, -0.3432502278890938, 0.08808833727977262, -0.25568475513594024, -0.0376178461700851, 0.22942819802884537, -0.028438215575312287, 0.04714923399166228, 0.056356514690634914, 0.019839091533168148, -0.08547566750889811, -0.14106207261106762, 0.3168382350838958, 0.08196859599616474, 0.14983702074879637, -0.06370486253693414, 0.06749273963699427, -0.020003072338369794, -0.02971325956810361, -0.04658725846093148, -0.18353431213575114, 0.07695631017215931, 0.17535142313975555, 0.08311596265635811, 0.18319308415998536, -0.3699587988070188, -0.1838305437286647, 0.08242949632814345, 0.15413935565186712, 0.0660443229553027, -0.008697639261252986, -0.24720211066335487, 0.07486850752432544, -0.1870766568627471, -0.1930022775941791, 0.017388167206006937, 0.09688123018862918, 0.03512455798082579, -0.22152760181014833, 0.15340104444513622, 0.12036804341448423, 0.03022406080820544, -0.16667235732259145, -0.05283626941411804, -0.058273423045205, 0.09203123572007872, 0.09170530473317903, 0.016495137366478164, 0.19263084864882657, -0.09288212572200558, -0.08370883121656683, 0.38556448084851486, -0.08269935016990833, -0.1056534968650876, 0.2057359751779586, -0.2875505958546478, -0.10009503927535544, 0.12446446252915148, 0.20727562363474414, 0.13825936988891604, -0.12709295026695308, 0.04037871866939195, -0.04853381391596766, 0.22814006171523568, 0.15280862444958004, 0.02972198295024916, 0.366202331148088, 0.11808893458398345, 0.012444790113920298, 0.13206938394787124, -0.19691581431573305, -0.042655988538172096, -0.2475762474589432, -0.07148952752901003, -0.12059604595803346, 0.053548485036933414, -0.1427538865894185, -0.14669001825677697, 0.3505634367824174, 0.11835422012537049, 0.22141682990014744, 0.030597165528422173, 0.2889616875789868, 0.13433449445829654, 0.06392470006353389, 0.1433802365611952, 0.3387220866846828, 0.17919020161468488, 0.08014448856911024, -0.2786501575118074, -0.016514007282706026, 0.040966048543431006] |
1,802.06774 | Entanglement entropy between virtual and real excitations in quantum
electrodynamics | The aim of this work is to introduce the entanglement entropy of real and
virtual excitations of fermion and photon fields. By rewriting the generating
functional of quantum electrodynamics theory as an inner product between
quantum operators, it is possible to obtain quantum density operators
representing the propagation of real and virtual particles. These operators are
partial traces, where the degrees of freedom traced out are unobserved
excitations. Then the Von Neumann definition of entropy can be applied to these
quantum operators and in particular, for the partial traces taken over the
internal or external degrees of freedom. A universal behavior is obtained for
the entanglement entropy for different quantum fields at zero order in the
coupling constant. In order to obtain numerical results at different orders in
the perturbation expansion, the Bloch-Nordsieck model is considered, where it
it shown that for some particular values of the electric charge, the von
Neumann entropy increases or decreases with respect to the non-interacting
case.
| hep-th | the aim of this work is to introduce the entanglement entropy of real and virtual excitations of fermion and photon fields by rewriting the generating functional of quantum electrodynamics theory as an inner product between quantum operators it is possible to obtain quantum density operators representing the propagation of real and virtual particles these operators are partial traces where the degrees of freedom traced out are unobserved excitations then the von neumann definition of entropy can be applied to these quantum operators and in particular for the partial traces taken over the internal or external degrees of freedom a universal behavior is obtained for the entanglement entropy for different quantum fields at zero order in the coupling constant in order to obtain numerical results at different orders in the perturbation expansion the blochnordsieck model is considered where it it shown that for some particular values of the electric charge the von neumann entropy increases or decreases with respect to the noninteracting case | [['the', 'aim', 'of', 'this', 'work', 'is', 'to', 'introduce', 'the', 'entanglement', 'entropy', 'of', 'real', 'and', 'virtual', 'excitations', 'of', 'fermion', 'and', 'photon', 'fields', 'by', 'rewriting', 'the', 'generating', 'functional', 'of', 'quantum', 'electrodynamics', 'theory', 'as', 'an', 'inner', 'product', 'between', 'quantum', 'operators', 'it', 'is', 'possible', 'to', 'obtain', 'quantum', 'density', 'operators', 'representing', 'the', 'propagation', 'of', 'real', 'and', 'virtual', 'particles', 'these', 'operators', 'are', 'partial', 'traces', 'where', 'the', 'degrees', 'of', 'freedom', 'traced', 'out', 'are', 'unobserved', 'excitations', 'then', 'the', 'von', 'neumann', 'definition', 'of', 'entropy', 'can', 'be', 'applied', 'to', 'these', 'quantum', 'operators', 'and', 'in', 'particular', 'for', 'the', 'partial', 'traces', 'taken', 'over', 'the', 'internal', 'or', 'external', 'degrees', 'of', 'freedom', 'a', 'universal', 'behavior', 'is', 'obtained', 'for', 'the', 'entanglement', 'entropy', 'for', 'different', 'quantum', 'fields', 'at', 'zero', 'order', 'in', 'the', 'coupling', 'constant', 'in', 'order', 'to', 'obtain', 'numerical', 'results', 'at', 'different', 'orders', 'in', 'the', 'perturbation', 'expansion', 'the', 'blochnordsieck', 'model', 'is', 'considered', 'where', 'it', 'it', 'shown', 'that', 'for', 'some', 'particular', 'values', 'of', 'the', 'electric', 'charge', 'the', 'von', 'neumann', 'entropy', 'increases', 'or', 'decreases', 'with', 'respect', 'to', 'the', 'noninteracting', 'case']] | [-0.1392292776913957, 0.21463687540066823, -0.05154417144180632, 0.03955376354537697, -0.02017133719759223, -0.10794792710343537, 0.006674976701083604, 0.29063753421234406, -0.27094930057114935, -0.2543581401700022, 0.055535317280755184, -0.330456230789423, -0.09580788892164918, 0.16115407066931373, -0.012214564962634518, 0.07645111461825752, 0.00010468771560462537, 0.11603402219321808, -0.07324617773037186, -0.24943616481377157, 0.3609224137344202, 0.024373199560041366, 0.2565516245516914, 0.0919961412207304, 0.0908810724561781, 0.005300795816799143, -0.0024329118723808614, 0.03932857535848463, -0.10963399411218828, 0.10269068940370171, 0.2607575973559079, 0.07285032660217473, 0.23322581666820671, -0.4289806512195939, -0.20936442125174734, 0.08225693903794443, 0.11136599265061962, 0.11365263860092073, 0.01847543794500791, -0.2917293623811278, 0.05239952751579062, -0.2061810996843341, -0.151327670929827, -0.11173103827362259, 0.008963561312146024, -0.03091318043736442, -0.2782676663123255, 0.09547708826254547, 0.03863032210049116, 0.058865400310030874, -0.04942114217735735, -0.057774740074370286, -0.03384086583384577, 0.13328167150820386, 0.04492763232620847, 0.004721296772958688, 0.12476424124511534, -0.13653437257025758, -0.12869071896061485, 0.3493406083952222, -0.055935183886358125, -0.23268705644403342, 0.1814486478285772, -0.14997211595717674, -0.07632858508548923, 0.0683985936482736, 0.12018173064585247, 0.12724200340654748, -0.11162716144669649, 0.12114696582796534, -0.004364926224994117, 0.14011485632336526, 0.07463721388284071, 0.09481192275703551, 0.17607508333583857, 0.02846092097662435, 0.07233412122284924, 0.18278877095701632, -0.020204410071910164, -0.17621116492829722, -0.34935210397995914, -0.21117107468128296, -0.19328653943483476, 0.08508460912681012, -0.10636877026955056, -0.17688513991051427, 0.3887420128599775, 0.13870293127493588, 0.17392502751856767, 0.020730155267189316, 0.27499834769606635, 0.1947414596891318, 0.09408378256858545, 0.0607982271603872, 0.20942413072151356, 0.18779091435961748, 0.07822003956800787, -0.2559281172889089, 0.009277060878014675, 0.07682889308866665] |
1,802.06775 | Mining Density Contrast Subgraphs | Dense subgraph discovery is a key primitive in many graph mining
applications, such as detecting communities in social networks and mining gene
correlation from biological data. Most studies on dense subgraph mining only
deal with one graph. However, in many applications, we have more than one graph
describing relations among a same group of entities. In this paper, given two
graphs sharing the same set of vertices, we investigate the problem of
detecting subgraphs that contrast the most with respect to density. We call
such subgraphs Density Contrast Subgraphs, or DCS in short. Two widely used
graph density measures, average degree and graph affinity, are considered. For
both density measures, mining DCS is equivalent to mining the densest subgraph
from a "difference" graph, which may have both positive and negative edge
weights. Due to the existence of negative edge weights, existing dense subgraph
detection algorithms cannot identify the subgraph we need. We prove the
computational hardness of mining DCS under the two graph density measures and
develop efficient algorithms to find DCS. We also conduct extensive experiments
on several real-world datasets to evaluate our algorithms. The experimental
results show that our algorithms are both effective and efficient.
| cs.SI | dense subgraph discovery is a key primitive in many graph mining applications such as detecting communities in social networks and mining gene correlation from biological data most studies on dense subgraph mining only deal with one graph however in many applications we have more than one graph describing relations among a same group of entities in this paper given two graphs sharing the same set of vertices we investigate the problem of detecting subgraphs that contrast the most with respect to density we call such subgraphs density contrast subgraphs or dcs in short two widely used graph density measures average degree and graph affinity are considered for both density measures mining dcs is equivalent to mining the densest subgraph from a difference graph which may have both positive and negative edge weights due to the existence of negative edge weights existing dense subgraph detection algorithms cannot identify the subgraph we need we prove the computational hardness of mining dcs under the two graph density measures and develop efficient algorithms to find dcs we also conduct extensive experiments on several realworld datasets to evaluate our algorithms the experimental results show that our algorithms are both effective and efficient | [['dense', 'subgraph', 'discovery', 'is', 'a', 'key', 'primitive', 'in', 'many', 'graph', 'mining', 'applications', 'such', 'as', 'detecting', 'communities', 'in', 'social', 'networks', 'and', 'mining', 'gene', 'correlation', 'from', 'biological', 'data', 'most', 'studies', 'on', 'dense', 'subgraph', 'mining', 'only', 'deal', 'with', 'one', 'graph', 'however', 'in', 'many', 'applications', 'we', 'have', 'more', 'than', 'one', 'graph', 'describing', 'relations', 'among', 'a', 'same', 'group', 'of', 'entities', 'in', 'this', 'paper', 'given', 'two', 'graphs', 'sharing', 'the', 'same', 'set', 'of', 'vertices', 'we', 'investigate', 'the', 'problem', 'of', 'detecting', 'subgraphs', 'that', 'contrast', 'the', 'most', 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'our', 'algorithms', 'the', 'experimental', 'results', 'show', 'that', 'our', 'algorithms', 'are', 'both', 'effective', 'and', 'efficient']] | [-0.12728943501662632, 0.04858316870928375, -0.03511001732238014, 0.07757391891444591, -0.1114390523883166, -0.09959092045123771, 0.044609755546329635, 0.4488851267731551, -0.2710196838603647, -0.33216220508899885, 0.10307813660098201, -0.3469117544309208, -0.2065186998160142, 0.12190310989454803, -0.08447002772843898, 0.07096654954813232, 0.131898610419923, 0.09858012886663824, 0.032884992962477336, -0.2403532651262158, 0.31036917402907604, -0.020055091728202322, 0.30152835934940314, 0.08195543716128943, 0.03373377736113411, -0.015763501573184676, -0.07825473693053643, 0.09154377198505281, -0.10844860995734273, 0.1703115786429297, 0.35081655718386173, 0.21341305418114057, 0.29254854015942494, -0.42874831687470877, -0.21958607652535042, 0.23510352362563477, 0.1460764973678372, 0.08783664912077413, -0.06093528407846044, -0.24721276191900474, 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1,802.06776 | A New Method in the Problem of Three Cubes | In the current paper we are seeking P1(y),P2(y),P3(y) with the highest
possible degree polynomials with integer coefficients, and Q(y) via the lowest
possible degree polynomial, such that P1(y)^3+P2(y)^3+P3(y)^3=Q(y). Actually,
the solution of this problem has close relation with the problem of the sum of
three cubes a^3+b^3+c^3=d, since deg Q(y)=0 case coincides with above mentioned
problem. It has been considered estimation of possibility of minimization of
deg Q(y). As a conclusion, for specific values of d we survey a new algorithm
for finding integer solutions of a^3+b^3+c^3=d.
| math.NT | in the current paper we are seeking p1yp2yp3y with the highest possible degree polynomials with integer coefficients and qy via the lowest possible degree polynomial such that p1y3p2y3p3y3qy actually the solution of this problem has close relation with the problem of the sum of three cubes a3b3c3d since deg qy0 case coincides with above mentioned problem it has been considered estimation of possibility of minimization of deg qy as a conclusion for specific values of d we survey a new algorithm for finding integer solutions of a3b3c3d | [['in', 'the', 'current', 'paper', 'we', 'are', 'seeking', 'p1yp2yp3y', 'with', 'the', 'highest', 'possible', 'degree', 'polynomials', 'with', 'integer', 'coefficients', 'and', 'qy', 'via', 'the', 'lowest', 'possible', 'degree', 'polynomial', 'such', 'that', 'p1y3p2y3p3y3qy', 'actually', 'the', 'solution', 'of', 'this', 'problem', 'has', 'close', 'relation', 'with', 'the', 'problem', 'of', 'the', 'sum', 'of', 'three', 'cubes', 'a3b3c3d', 'since', 'deg', 'qy0', 'case', 'coincides', 'with', 'above', 'mentioned', 'problem', 'it', 'has', 'been', 'considered', 'estimation', 'of', 'possibility', 'of', 'minimization', 'of', 'deg', 'qy', 'as', 'a', 'conclusion', 'for', 'specific', 'values', 'of', 'd', 'we', 'survey', 'a', 'new', 'algorithm', 'for', 'finding', 'integer', 'solutions', 'of', 'a3b3c3d']] | [-0.1400569236188525, 0.04585939645767212, -0.012893463076069587, -0.010681840105595567, -0.07420182374601321, -0.14308492397526051, 0.045667963773977555, 0.34788577604993454, -0.3003579314071231, -0.3243464767966965, 0.11706780707435228, -0.29209900447508186, -0.1627271353017266, 0.1826437880262369, -0.02430495504494302, 0.08796394249958855, 0.023461865908579856, 0.06187968358124902, -0.06952919804053835, -0.28493027666174786, 0.32532177963180514, 0.029279805214439587, 0.1888896147152636, 0.0486219324719547, 0.1359729102767277, -0.012088863531173003, 0.008640598465983824, 0.02662824944411291, -0.16341968493512335, 0.09617202680858943, 0.27001516150719507, 0.16535905158294864, 0.26635893895404367, -0.30372909212303234, -0.12527763224547592, 0.17736984185715457, 0.1575694857789885, 0.06870446069075203, 0.003915536285537045, -0.17088437427641687, 0.12609877153413324, -0.142787930223787, -0.17643848032031845, -0.011635618806793922, 0.06321426679766397, 0.0337322435409921, -0.2886842180770345, 0.08739103838267577, 0.052191601237055005, 0.08298070644732655, -0.0929225236773718, -0.22417748881867383, 0.027139955512588708, 0.07358420782200084, 0.06137317662104601, 0.06948052834231043, -0.029008428418509116, -0.1375998934793354, -0.12844865928154167, 0.37928316074355345, -0.02426499703035849, -0.2053387945449752, 0.128441362301024, -0.1676375443547419, -0.1494397077249454, 0.13446585586146884, 0.09822825776844672, 0.14874919463039898, -0.09624046008897627, 0.09819499286184111, -0.11923079362576373, 0.12410619034908893, 0.10493120705004691, 0.022197625435116452, 0.20132773024279896, 0.10237815645636945, 0.12074513686820865, 0.17266805139483837, -0.07336614937407941, -0.06867110380113534, -0.29140541393582414, -0.14587601457109176, -0.18947353678551027, 0.03926001635959327, -0.09562319767552786, -0.11953247672446617, 0.4003841954186877, 0.1128580159049484, 0.18886942170821586, 0.07235835116106744, 0.2585760270268088, 0.16655008805626095, 0.02332317934757689, 0.05256232627235898, 0.22084258895696754, 0.1257204333882461, 0.05580746352945159, -0.18545233469354216, 0.0750685781694767, 0.06682499349060492] |
1,802.06777 | The selection function of the LAMOST Spectroscopic Survey of the
Galactic Anticentre | We present a detailed analysis of the selection function of the LAMOST
Spectroscopic Survey of the Galactic Anti-centre (LSS-GAC). LSS-GAC was
designed to obtain low resolution optical spectra for a sample of more than 3
million stars in the Galactic anti-centre. The second release of value-added
catalogues of the LSS-GAC (LSS-GAC DR2) contains stellar parameters, including
radial velocity, atmospheric parameters, elemental abundances and absolute
magnitudes deduced from 1.8 million spectra of 1.4 million unique stars
targeted by the LSS-GAC between 2011 and 2014. For many studies using this
database, such as those investigating the chemodynamical structure of the Milky
Way, a detailed understanding of the selection function of the survey is
indispensable. In this paper, we describe how the selection function of the
LSS-GAC can be evaluated to sufficient detail and provide selection function
corrections for all spectroscopic measurements with reliable parameters
released in LSS-GAC DR2. The results, to be released as new entries in the
LSS-GAC value-added catalogues, can be used to correct the selection effects of
the catalogue for scientific studies of various purposes.
| astro-ph.GA astro-ph.SR | we present a detailed analysis of the selection function of the lamost spectroscopic survey of the galactic anticentre lssgac lssgac was designed to obtain low resolution optical spectra for a sample of more than 3 million stars in the galactic anticentre the second release of valueadded catalogues of the lssgac lssgac dr2 contains stellar parameters including radial velocity atmospheric parameters elemental abundances and absolute magnitudes deduced from 18 million spectra of 14 million unique stars targeted by the lssgac between 2011 and 2014 for many studies using this database such as those investigating the chemodynamical structure of the milky way a detailed understanding of the selection function of the survey is indispensable in this paper we describe how the selection function of the lssgac can be evaluated to sufficient detail and provide selection function corrections for all spectroscopic measurements with reliable parameters released in lssgac dr2 the results to be released as new entries in the lssgac valueadded catalogues can be used to correct the selection effects of the catalogue for scientific studies of various purposes | [['we', 'present', 'a', 'detailed', 'analysis', 'of', 'the', 'selection', 'function', 'of', 'the', 'lamost', 'spectroscopic', 'survey', 'of', 'the', 'galactic', 'anticentre', 'lssgac', 'lssgac', 'was', 'designed', 'to', 'obtain', 'low', 'resolution', 'optical', 'spectra', 'for', 'a', 'sample', 'of', 'more', 'than', '3', 'million', 'stars', 'in', 'the', 'galactic', 'anticentre', 'the', 'second', 'release', 'of', 'valueadded', 'catalogues', 'of', 'the', 'lssgac', 'lssgac', 'dr2', 'contains', 'stellar', 'parameters', 'including', 'radial', 'velocity', 'atmospheric', 'parameters', 'elemental', 'abundances', 'and', 'absolute', 'magnitudes', 'deduced', 'from', '18', 'million', 'spectra', 'of', '14', 'million', 'unique', 'stars', 'targeted', 'by', 'the', 'lssgac', 'between', '2011', 'and', '2014', 'for', 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1,802.06778 | Quasi-Newtonian Cosmological Models in Scalar-Tensor Theories of Gravity | In this contribution, classes of shear-free cosmological dust models with
irrotational fluid flows will be investigated in the context of scalar-tensor
theories of gravity. In particular, the integrability conditions describing a
consistent evolution of the linearised field equations of quasi-Newtonian
universes are presented. We also derive the covariant density and velocity
propagation equations of such models and analyse the corresponding solutions to
these perturbation equations.
| gr-qc hep-th | in this contribution classes of shearfree cosmological dust models with irrotational fluid flows will be investigated in the context of scalartensor theories of gravity in particular the integrability conditions describing a consistent evolution of the linearised field equations of quasinewtonian universes are presented we also derive the covariant density and velocity propagation equations of such models and analyse the corresponding solutions to these perturbation equations | [['in', 'this', 'contribution', 'classes', 'of', 'shearfree', 'cosmological', 'dust', 'models', 'with', 'irrotational', 'fluid', 'flows', 'will', 'be', 'investigated', 'in', 'the', 'context', 'of', 'scalartensor', 'theories', 'of', 'gravity', 'in', 'particular', 'the', 'integrability', 'conditions', 'describing', 'a', 'consistent', 'evolution', 'of', 'the', 'linearised', 'field', 'equations', 'of', 'quasinewtonian', 'universes', 'are', 'presented', 'we', 'also', 'derive', 'the', 'covariant', 'density', 'and', 'velocity', 'propagation', 'equations', 'of', 'such', 'models', 'and', 'analyse', 'the', 'corresponding', 'solutions', 'to', 'these', 'perturbation', 'equations']] | [-0.1854392053380322, 0.1125540153392089, -0.11649692219037276, 0.10137456347986769, -0.07600733714106564, -0.07508147349581122, -0.14135996066750242, 0.2571583855037506, -0.229638300015806, -0.25999370883577144, 0.07979659020649986, -0.2383347996725486, -0.10204934899050455, 0.11502165869236565, -0.028519378380420117, 0.05189959813769047, 0.01600668949719805, 0.009261437928160796, -0.10482225375106702, -0.2415992473037197, 0.390322193947549, 0.032030751928687096, 0.21843375149541178, -0.03474630696269182, 0.13019461087309397, -0.1025269753084733, -0.0624631308305722, 0.08737800201186194, -0.2405324438586831, 0.05823865862419972, 0.22289563769691784, 0.10265642129457914, 0.1799583077430725, -0.48795389412687373, -0.301620063615533, 0.052759971286958224, 0.13935926832401982, 0.19749137251996077, -0.024999229774738733, -0.29879717068889966, 0.02722101639956236, -0.16402889378368854, -0.2198061622106112, -0.060034233822415656, 0.01863119700529541, 0.050948730311714686, -0.2072187333439405, 0.16180446689473824, 0.02168418889721999, 0.009854524365465085, -0.19408714662735851, -0.04143487610496008, -0.05619737839397903, 0.01871524975420191, 0.12047845255583525, -0.03258664490511784, 0.08978017767031606, -0.2031436621892051, -0.044170181768444866, 0.4374143621096244, -0.1506721631695445, -0.27807297124885594, 0.16937598821062308, -0.15194289488135837, -0.14474537934964665, 0.06312153787853626, 0.20616677909946213, 0.1792819100503738, -0.19897038945211815, 0.13198338458851838, -0.01039087565508313, 0.09228119481928074, 0.0933190932857822, -0.002800184259047875, 0.2793142914772034, 0.0868610533240896, -0.0126967220638807, 0.08725866543379827, 0.0030305428716998835, -0.1450598361185537, -0.41623369799210475, -0.14360236140111318, -0.050386239860493405, 0.05946797455231158, -0.15375392383206277, -0.19611204088164064, 0.3700285615829321, 0.1988625278051656, 0.06335059037575355, 0.08479584207973229, 0.22579055548860477, 0.14435082552148604, -0.009269701449487073, 0.13111773702101065, 0.29369586278469517, 0.2537108662896431, 0.12186675743880467, -0.22220703538310213, -0.03831875865849165, 0.10543970279753781] |
1,802.06779 | Global survey of star clusters in the Milky Way VI. Age distribution and
cluster formation history | The all-sky Milky Way Star Clusters (MWSC) survey provides uniform and
precise ages and other parameters for a variety of clusters in the Solar
Neighbourhood. We construct the cluster age distribution, investigate its
spatial variations, and discuss constraints on cluster formation scenarios of
the Galactic disk during the last 5 Gyrs. Due to the spatial extent of the
MWSC, we consider spatial variations of the age distribution along
galactocentric radius $R_G$, and along $Z$-axis. For the analysis of the age
distribution we use 2242 clusters, which all lie within roughly 2.5 kpc of the
Sun. To connect the observed age distribution to the cluster formation history
we build an analytical model based on simple assumptions on the cluster initial
mass function and on the cluster mass-lifetime relation, fit it to the
observations, and determine the parameters of the cluster formation law.
Comparison with the literature shows that earlier results strongly
underestimated the number of evolved clusters with ages $t\gtrsim 100$ Myr.
Recent studies based on all-sky catalogues agree better with our data, but
still lack the oldest clusters with ages $t\gtrsim 1$ Gyr. We do not observe a
strong variation in the age distribution along $R_G$, though we find an
enhanced fraction of older clusters ($t>1$ Gyr) in the inner disk. In contrast,
the distribution strongly varies along $Z$. The high altitude distribution
practically does not contain clusters with $t<1$ Gyr. With simple assumptions
on the cluster formation history, cluster initial mass function and cluster
lifetime we can reproduce the observations. Cluster formation rate and cluster
lifetime are strongly degenerate, which does not allow us to disentangle
different formation scenarios. In all cases the cluster formation rate is
strongly declining with time, and the cluster initial mass function is very
shallow at the high mass end. (abridged)
| astro-ph.GA astro-ph.SR | the allsky milky way star clusters mwsc survey provides uniform and precise ages and other parameters for a variety of clusters in the solar neighbourhood we construct the cluster age distribution investigate its spatial variations and discuss constraints on cluster formation scenarios of the galactic disk during the last 5 gyrs due to the spatial extent of the mwsc we consider spatial variations of the age distribution along galactocentric radius r_g and along zaxis for the analysis of the age distribution we use 2242 clusters which all lie within roughly 25 kpc of the sun to connect the observed age distribution to the cluster formation history we build an analytical model based on simple assumptions on the cluster initial mass function and on the cluster masslifetime relation fit it to the observations and determine the parameters of the cluster formation law comparison with the literature shows that earlier results strongly underestimated the number of evolved clusters with ages tgtrsim 100 myr recent studies based on allsky catalogues agree better with our data but still lack the oldest clusters with ages tgtrsim 1 gyr we do not observe a strong variation in the age distribution along r_g though we find an enhanced fraction of older clusters t1 gyr in the inner disk in contrast the distribution strongly varies along z the high altitude distribution practically does not contain clusters with t1 gyr with simple assumptions on the cluster formation history cluster initial mass function and cluster lifetime we can reproduce the observations cluster formation rate and cluster lifetime are strongly degenerate which does not allow us to disentangle different formation scenarios in all cases the cluster formation rate is strongly declining with time and the cluster initial mass function is very shallow at the high mass end abridged | [['the', 'allsky', 'milky', 'way', 'star', 'clusters', 'mwsc', 'survey', 'provides', 'uniform', 'and', 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1,802.0678 | Asymptotic-Preserving scheme for the resolution of evolution equations
with stiff transport terms | We develop an asymptotic-preserving scheme to solve evolution problems
containing stiff transport terms. This scheme is based to a micro-macro
decomposition of the unknown, coupled with a stabilization procedure. The
numerical method is applied to the Vlasov equation in the gyrokinetic regime
and to the Vlasov-Poisson 1D1V equation, which occur in plasma physics. The
asymptotic-preserving properties of our procedure permit to study the long-time
behavior of these models. In particular, we limit drastically by this method
the numerical pollution, appearing in such time asymptotics when using
classical numerical schemes.
| math.NA | we develop an asymptoticpreserving scheme to solve evolution problems containing stiff transport terms this scheme is based to a micromacro decomposition of the unknown coupled with a stabilization procedure the numerical method is applied to the vlasov equation in the gyrokinetic regime and to the vlasovpoisson 1d1v equation which occur in plasma physics the asymptoticpreserving properties of our procedure permit to study the longtime behavior of these models in particular we limit drastically by this method the numerical pollution appearing in such time asymptotics when using classical numerical schemes | [['we', 'develop', 'an', 'asymptoticpreserving', 'scheme', 'to', 'solve', 'evolution', 'problems', 'containing', 'stiff', 'transport', 'terms', 'this', 'scheme', 'is', 'based', 'to', 'a', 'micromacro', 'decomposition', 'of', 'the', 'unknown', 'coupled', 'with', 'a', 'stabilization', 'procedure', 'the', 'numerical', 'method', 'is', 'applied', 'to', 'the', 'vlasov', 'equation', 'in', 'the', 'gyrokinetic', 'regime', 'and', 'to', 'the', 'vlasovpoisson', '1d1v', 'equation', 'which', 'occur', 'in', 'plasma', 'physics', 'the', 'asymptoticpreserving', 'properties', 'of', 'our', 'procedure', 'permit', 'to', 'study', 'the', 'longtime', 'behavior', 'of', 'these', 'models', 'in', 'particular', 'we', 'limit', 'drastically', 'by', 'this', 'method', 'the', 'numerical', 'pollution', 'appearing', 'in', 'such', 'time', 'asymptotics', 'when', 'using', 'classical', 'numerical', 'schemes']] | [-0.09930490509062755, 0.052163588025854385, -0.1483454594409533, 0.031267278817262545, -0.0449445851047764, -0.11799706162863903, -0.004941417846117127, 0.2987126581935903, -0.2964763863069748, -0.2921621451007851, 0.1045544277157195, -0.1981840528171049, -0.1416677116322216, 0.20366935291735644, -0.024132522314870626, 0.12000246631672208, 0.0850896735079168, -0.05505317607580611, -0.0610544750718086, -0.23863803171500397, 0.3057156429963521, 0.05674716230714694, 0.28795887515199986, 0.015376175115450044, 0.13335304942212245, -0.05630576637249147, 0.004073073263437058, 0.032125907405959754, -0.15574326537588082, 0.07149928508410125, 0.25074312684121786, 0.04305780231377131, 0.29108832899109577, -0.4495376744883114, -0.2482709495999505, 0.0609438723957773, 0.17288510578820546, 0.17954687572612815, -0.04137225270668945, -0.24667342370271347, 0.06101452277612276, -0.17788382806145492, -0.194258291478363, -0.09472703529793895, -0.056375160959831784, 0.055778415062663594, -0.3032873726837086, 0.13172754916372928, 0.04438902501257534, -0.022461795138216084, -0.06783242848063453, -0.03314327436049333, 0.0637195990983334, 0.05430120912941665, 0.05702358687798796, -0.04579426967695858, 0.04855017989266957, -0.11762610075765112, -0.09110167701048462, 0.4011080851255173, -0.07582532806489407, -0.28637340543477724, 0.1934006499738715, -0.11411177482602469, -0.12088954298014051, 0.15167790522087324, 0.18446825267851688, 0.19802130619063973, -0.14529291659497443, 0.09847197806125171, -0.01099286252486237, 0.13749465543065179, 0.008804255524869966, -0.016180007059252665, 0.07540372333206823, 0.21619042382756082, 0.02923144908684693, 0.13014576915818987, -0.05756348233115388, -0.15922673161696183, -0.318307236967127, -0.13361089859743802, -0.147897458614342, 0.041508829477504734, -0.06909251214627025, -0.21342335482326785, 0.38845488539754003, 0.22880795686126404, 0.10655160208515237, -0.009392204546641685, 0.31979863914880857, 0.20715792046655807, -0.03281478229269197, 0.10656513014724583, 0.2131834618140305, 0.18717353814984594, 0.14979199933285794, -0.32935874232122403, -0.001753631199636821, 0.18837053935681836] |
1,802.06781 | Theoretical analysis on the $K^{-} {}^{3} \text{He} \to \Lambda p n$
reaction for the $\bar{K} N N$ bound-state search in the J-PARC E15
experiment | We theoretically analyze the $K^{-} {}^{3} \text{He} \to \Lambda p n$
reaction for the $\bar{K} N N$ bound-state search in the J-PARC E15 experiment.
We find that, by detecting a fast and forward neutron in the final state, an
almost on-shell $\bar{K}$ is guaranteed, which is essential to make a bound
state with two nucleons from ${}^{3} \text{He}$. Then, this almost on-shell
$\bar{K}$ can bring a signal of the $\bar{K} N N$ bound state in the $\Lambda
p$ invariant-mass spectrum, although it inevitably brings a kinematic peak
above the $\bar{K} N N$ threshold as well. As a consequence, we predict two
peaks across the $\bar{K} N N$ threshold in the spectrum: the lower peak coming
from the $\bar{K} N N$ bound state, and the higher one originating from the
kinematics.
| nucl-th hep-ph nucl-ex | we theoretically analyze the k 3 texthe to lambda p n reaction for the bark n n boundstate search in the jparc e15 experiment we find that by detecting a fast and forward neutron in the final state an almost onshell bark is guaranteed which is essential to make a bound state with two nucleons from 3 texthe then this almost onshell bark can bring a signal of the bark n n bound state in the lambda p invariantmass spectrum although it inevitably brings a kinematic peak above the bark n n threshold as well as a consequence we predict two peaks across the bark n n threshold in the spectrum the lower peak coming from the bark n n bound state and the higher one originating from the kinematics | [['we', 'theoretically', 'analyze', 'the', 'k', '3', 'texthe', 'to', 'lambda', 'p', 'n', 'reaction', 'for', 'the', 'bark', 'n', 'n', 'boundstate', 'search', 'in', 'the', 'jparc', 'e15', 'experiment', 'we', 'find', 'that', 'by', 'detecting', 'a', 'fast', 'and', 'forward', 'neutron', 'in', 'the', 'final', 'state', 'an', 'almost', 'onshell', 'bark', 'is', 'guaranteed', 'which', 'is', 'essential', 'to', 'make', 'a', 'bound', 'state', 'with', 'two', 'nucleons', 'from', '3', 'texthe', 'then', 'this', 'almost', 'onshell', 'bark', 'can', 'bring', 'a', 'signal', 'of', 'the', 'bark', 'n', 'n', 'bound', 'state', 'in', 'the', 'lambda', 'p', 'invariantmass', 'spectrum', 'although', 'it', 'inevitably', 'brings', 'a', 'kinematic', 'peak', 'above', 'the', 'bark', 'n', 'n', 'threshold', 'as', 'well', 'as', 'a', 'consequence', 'we', 'predict', 'two', 'peaks', 'across', 'the', 'bark', 'n', 'n', 'threshold', 'in', 'the', 'spectrum', 'the', 'lower', 'peak', 'coming', 'from', 'the', 'bark', 'n', 'n', 'bound', 'state', 'and', 'the', 'higher', 'one', 'originating', 'from', 'the', 'kinematics']] | [-0.1564337373782809, 0.2317151647062229, -0.11046889905231252, 0.07543180382255321, 0.008389412590230887, -0.15880551405179386, 0.11326847852995763, 0.2746673918902301, -0.24288710829658577, -0.3183410903510566, -0.03815993503309213, -0.348184361280157, -0.07326408528472082, 0.09936664114312198, 0.12829025282811088, 0.06406239109615294, 0.0468332891818136, 0.15963318491927705, -0.009227105658143185, -0.19120172497261173, 0.3115788488792112, 0.026278370357333467, 0.20724130091615595, 0.07761550514349858, 0.008219643073299756, 0.011168609620430148, 0.039647440927533, -0.09810633672974431, -0.10401809161306189, 0.046775991026347934, 0.3188613441127997, 0.14933131223257917, 0.16598223693525563, -0.3783786264534753, -0.09373255599415503, 0.12280278643234992, 0.2102709526554323, 0.08969204463333322, 0.03674497010293775, -0.2864881766386903, 0.13040764117971637, -0.1460229921512879, -0.133217301302088, 0.012783004250377417, 0.08746519155370501, -0.0696963088443646, -0.2774699234242479, 0.0020115574929290094, 0.05172273610414078, 0.007813408211446726, -0.01866134976466688, -0.24279999667151758, -0.012317086668470157, 0.08021296390618843, 0.013831688811142858, 0.09351838196184523, 0.10726009918949925, -0.15948984573344485, -0.054650300447470865, 0.3394639923093984, -0.10003136737057222, -0.14129963754855382, 0.11814981002647143, -0.1746830081414933, -0.11251442874781788, 0.20566391165439898, 0.14086277364538266, 0.10915844686902486, -0.06916830517494908, 0.14090745167967936, -0.07295789954771932, 0.22176716448022768, 0.11116206695039112, 0.03681313068999981, 0.10089715361380233, 0.15226723988934493, 0.06946488106623291, 0.11334933666154169, -0.11495252039570075, -0.0448088080335695, -0.3351096764529267, -0.11094180777839098, -0.12350145879989634, 0.12782760716150873, -0.07401035297281432, -0.06589537418375795, 0.3003944144512598, 0.05676826884211131, 0.3279357467375051, 0.0660903361023744, 0.28324636671548853, 0.11777555348459058, 0.007141304195213777, 0.12072126934161553, 0.23330138225394945, 0.16643351551610977, 0.050002854618315516, -0.2583299404923589, 0.029150140437727363, 0.013996651338843199] |
1,802.06782 | The Enigma of Star Formation at High Galactic Latitudes | Molecular clouds at very high latitudes ($b > 60^o$) away from the Galactic
plane are considered rare and not conventional sites of star formation.
Contrary to this, the recent discovery of high latitude embedded Clusters can
possibly change our understanding of the Galaxy formation, evolution and
dynamics and the role of the halo in the Galactic evolutionary process. This
article reviews a study of nine embedded clusters (ECs) reported in recent
literature with ages less than 5 Myr and vertical distances from the galactic
disc ranging from 1.8 to 5 kpc. It discusses the processes that could cause
star formation within low density and extraplanar environments in the halo and
discuss the possible origins of these clusters. Are these episodic events or is
star cluster formation a systematic phenomenon in the Galactic halo? Two of
these objects will be observed by us with Astrosat, so we shall comment on the
possible results we expect to get with Astrostat UV and Xray data.
| astro-ph.GA astro-ph.SR | molecular clouds at very high latitudes b 60o away from the galactic plane are considered rare and not conventional sites of star formation contrary to this the recent discovery of high latitude embedded clusters can possibly change our understanding of the galaxy formation evolution and dynamics and the role of the halo in the galactic evolutionary process this article reviews a study of nine embedded clusters ecs reported in recent literature with ages less than 5 myr and vertical distances from the galactic disc ranging from 18 to 5 kpc it discusses the processes that could cause star formation within low density and extraplanar environments in the halo and discuss the possible origins of these clusters are these episodic events or is star cluster formation a systematic phenomenon in the galactic halo two of these objects will be observed by us with astrosat so we shall comment on the possible results we expect to get with astrostat uv and xray data | [['molecular', 'clouds', 'at', 'very', 'high', 'latitudes', 'b', '60o', 'away', 'from', 'the', 'galactic', 'plane', 'are', 'considered', 'rare', 'and', 'not', 'conventional', 'sites', 'of', 'star', 'formation', 'contrary', 'to', 'this', 'the', 'recent', 'discovery', 'of', 'high', 'latitude', 'embedded', 'clusters', 'can', 'possibly', 'change', 'our', 'understanding', 'of', 'the', 'galaxy', 'formation', 'evolution', 'and', 'dynamics', 'and', 'the', 'role', 'of', 'the', 'halo', 'in', 'the', 'galactic', 'evolutionary', 'process', 'this', 'article', 'reviews', 'a', 'study', 'of', 'nine', 'embedded', 'clusters', 'ecs', 'reported', 'in', 'recent', 'literature', 'with', 'ages', 'less', 'than', '5', 'myr', 'and', 'vertical', 'distances', 'from', 'the', 'galactic', 'disc', 'ranging', 'from', '18', 'to', '5', 'kpc', 'it', 'discusses', 'the', 'processes', 'that', 'could', 'cause', 'star', 'formation', 'within', 'low', 'density', 'and', 'extraplanar', 'environments', 'in', 'the', 'halo', 'and', 'discuss', 'the', 'possible', 'origins', 'of', 'these', 'clusters', 'are', 'these', 'episodic', 'events', 'or', 'is', 'star', 'cluster', 'formation', 'a', 'systematic', 'phenomenon', 'in', 'the', 'galactic', 'halo', 'two', 'of', 'these', 'objects', 'will', 'be', 'observed', 'by', 'us', 'with', 'astrosat', 'so', 'we', 'shall', 'comment', 'on', 'the', 'possible', 'results', 'we', 'expect', 'to', 'get', 'with', 'astrostat', 'uv', 'and', 'xray', 'data']] | [-0.07813008141744396, 0.13440934635455842, -0.05801434246157961, 0.10497944436861668, -0.09665873482163927, -0.004451442990012421, 0.06339150289889217, 0.4205266557755354, -0.2075328513320466, -0.37306125669144324, 0.06628487413309468, -0.285178832527574, -0.07221064071737877, 0.18182728137757329, -0.03246582798538324, -0.07212819375520028, 0.052404289441154286, -0.05752310118065303, -0.028355542267745025, -0.2763789171636429, 0.30766400018915163, 0.08627780728705187, 0.14520332486779422, 0.0062959667248940615, 0.03614559211198426, -0.10688240288739434, -0.08397892147724904, -0.02865040672781027, -0.1809212326245062, 0.07666479986801278, 0.2494773404001727, 0.1386035022829075, 0.21506263121603902, -0.41945359055878395, -0.22471633431449625, 0.0644491017992776, 0.21357354153850064, 0.07122006917788838, -0.10736104717365356, -0.25234262159120247, 0.07867202148570315, -0.17629526921125674, -0.18439590236640635, 0.06787219475405233, 0.04631880406429124, 0.04108930523478374, -0.16612768701063643, 0.1307463356068138, 0.0329733387341503, 0.07388102587728952, -0.08492906537899018, -0.1283211165356525, -0.026689878218049495, 0.09586158302982818, 0.0441406665712245, 0.10084512968466658, 0.21819254760601506, -0.12014604741360367, -0.07272912157259835, 0.4109507184764891, -0.01562362409644017, -0.012725974459425974, 0.2982109173024594, -0.2536518481525344, -0.1939276030535885, 0.10317824281728971, 0.1793066143601994, 0.10688514862012882, -0.17328084019585427, 0.00556196926522462, 0.0020764790878845204, 0.1551323039891048, 0.060007587551017816, 0.05683434750136026, 0.3270351449230119, 0.13869029475066533, 0.049586277562106804, 0.07993683989538655, -0.21528810520529146, -0.09993379629236611, -0.2174075527018318, -0.07295328614111088, -0.07442335959492101, 0.08279166395079289, -0.1045869580486837, -0.09980709271445641, 0.32073825221474034, 0.12967527599033454, 0.24494365139673493, 0.002196546417649442, 0.2565255492219921, 0.022003875956407848, 0.10162171449617813, 0.10962451997022174, 0.2842305182234922, 0.1416225924766883, 0.08521194352554332, -0.2068224658112921, 0.09534714399165943, -0.04510512857796242] |
1,802.06783 | Wandering Supermassive Black Holes in Milky Way Mass Halos | We present a self-consistent prediction from a large-scale cosmological
simulation for the population of `wandering' supermassive black holes (SMBHs)
of mass greater than $10^6$ M$_{\odot}$ on long-lived, kpc-scale orbits within
Milky Way (MW)-mass galaxies. We extract a sample of MW-mass halos from the
Romulus25 cosmological simulation (Tremmel et al. 2017), which is uniquely able
to capture the orbital evolution of SMBHs during and following galaxy mergers.
We predict that such halos, regardless of recent merger history or morphology,
host an average of $5.1 \pm 3.3$ SMBHs, including their central black hole,
within 10 kpc from the galactic center and an average of $12.2 \pm 8.4$ SMBHs
total within their virial radius, not counting those in satellite halos.
Wandering SMBHs exist within their host galaxies for several Gyrs, often
accreted by their host halo in the early Universe. We find, with $>4\sigma$
significance, that wandering SMBHs are preferentially found outside of galactic
disks.
| astro-ph.GA | we present a selfconsistent prediction from a largescale cosmological simulation for the population of wandering supermassive black holes smbhs of mass greater than 106 m_odot on longlived kpcscale orbits within milky way mwmass galaxies we extract a sample of mwmass halos from the romulus25 cosmological simulation tremmel et al 2017 which is uniquely able to capture the orbital evolution of smbhs during and following galaxy mergers we predict that such halos regardless of recent merger history or morphology host an average of 51 pm 33 smbhs including their central black hole within 10 kpc from the galactic center and an average of 122 pm 84 smbhs total within their virial radius not counting those in satellite halos wandering smbhs exist within their host galaxies for several gyrs often accreted by their host halo in the early universe we find with 4sigma significance that wandering smbhs are preferentially found outside of galactic disks | [['we', 'present', 'a', 'selfconsistent', 'prediction', 'from', 'a', 'largescale', 'cosmological', 'simulation', 'for', 'the', 'population', 'of', 'wandering', 'supermassive', 'black', 'holes', 'smbhs', 'of', 'mass', 'greater', 'than', '106', 'm_odot', 'on', 'longlived', 'kpcscale', 'orbits', 'within', 'milky', 'way', 'mwmass', 'galaxies', 'we', 'extract', 'a', 'sample', 'of', 'mwmass', 'halos', 'from', 'the', 'romulus25', 'cosmological', 'simulation', 'tremmel', 'et', 'al', '2017', 'which', 'is', 'uniquely', 'able', 'to', 'capture', 'the', 'orbital', 'evolution', 'of', 'smbhs', 'during', 'and', 'following', 'galaxy', 'mergers', 'we', 'predict', 'that', 'such', 'halos', 'regardless', 'of', 'recent', 'merger', 'history', 'or', 'morphology', 'host', 'an', 'average', 'of', '51', 'pm', '33', 'smbhs', 'including', 'their', 'central', 'black', 'hole', 'within', '10', 'kpc', 'from', 'the', 'galactic', 'center', 'and', 'an', 'average', 'of', '122', 'pm', '84', 'smbhs', 'total', 'within', 'their', 'virial', 'radius', 'not', 'counting', 'those', 'in', 'satellite', 'halos', 'wandering', 'smbhs', 'exist', 'within', 'their', 'host', 'galaxies', 'for', 'several', 'gyrs', 'often', 'accreted', 'by', 'their', 'host', 'halo', 'in', 'the', 'early', 'universe', 'we', 'find', 'with', '4sigma', 'significance', 'that', 'wandering', 'smbhs', 'are', 'preferentially', 'found', 'outside', 'of', 'galactic', 'disks']] | [-0.09442394349025562, 0.08075133268281015, -0.03953677904945308, 0.1404217732066938, -0.0947311743297369, 0.024668729248285098, 0.044617925508646294, 0.3839090738421012, -0.08006288551137243, -0.41263080307429556, 0.00991176730205648, -0.3314692038551776, 0.0080054427426627, 0.2098945409264783, -0.0016554029578784186, -0.015226938588679522, 0.0151727645264289, -0.10465391150194735, -0.06358093255901047, -0.3259415440253705, 0.27765934722571584, 0.10600625374048066, 0.09109307911345049, -0.11719072527117341, 0.08164081109249596, -0.08099349294053881, -0.04328878997445205, -0.06342602452557337, -0.22596405998630967, -0.014698676146125715, 0.2488813509790864, 0.16778581856909258, 0.2595211554858236, -0.3967283824272511, -0.1666147527606594, 0.09615494736384503, 0.2759377874930291, 0.08176920252107696, -0.16286296076156614, -0.2858052043991752, 0.13822525435764538, -0.2727115247000352, -0.15631419556264423, 0.11454243710460632, 0.10687550498589285, 0.02171747217040607, -0.1245467922570625, 0.27981340610667277, 0.033294321714875924, 0.011123675387352705, -0.1074788148643596, -0.04160886577569487, -0.10243560974547443, 0.05091348865933373, 0.04308202910071582, 0.07774485893375975, 0.3369089832167925, -0.0616164460033791, -0.05294576648310268, 0.41151744057424366, 0.010531079833909692, 0.027109086513519287, 0.23556766906557114, -0.28662319471109904, -0.1881702388238505, 0.1138398134728624, 0.20696666374447217, 0.13847332191730138, -0.16042707523784452, 0.0008738977232592573, -0.025959569093078914, 0.25317901704118795, 0.06665085510068916, 0.021781442244326554, 0.48244494500900864, 0.09191262714662835, 0.03723110553064065, -0.01567718568778793, -0.14994812467270285, -0.04673308616092024, -0.15911265845888442, -0.06627014342015364, -0.13120224685285634, 0.1581395569895616, -0.20250963922693413, -0.08147566710402698, 0.3184431483938457, 0.11089987323104747, 0.27278596441580083, 0.09736318443672069, 0.24938509555194718, -0.02543612816493566, 0.10216656896457273, 0.18531894763950013, 0.35640820334542933, 0.1877027742356356, 0.010337084692621016, -0.23693920865097376, 0.025574090701411478, -0.022569332262623663] |
1,802.06784 | Matter Density Profile Shape Effects at DUNE | Quantum mechanical interactions between neutrinos and matter along the path
of propagation, the Wolfenstein matter effect, are of particular importance for
the upcoming long-baseline neutrino oscillation experiments, specifically the
Deep Underground Neutrino Experiment (DUNE). Here, we explore specifically what
about the matter density profile can be measured by DUNE, considering both the
shape and normalization of the profile between the neutrinos' origin and
detection. Additionally, we explore the capability of a perturbative method for
calculating neutrino oscillation probabilities and whether this method is
suitable for DUNE. We also briefly quantitatively explore the ability of DUNE
to measure the Earth's matter density, and the impact of performing this
measurement on measuring standard neutrino oscillation parameters.
| hep-ph hep-ex | quantum mechanical interactions between neutrinos and matter along the path of propagation the wolfenstein matter effect are of particular importance for the upcoming longbaseline neutrino oscillation experiments specifically the deep underground neutrino experiment dune here we explore specifically what about the matter density profile can be measured by dune considering both the shape and normalization of the profile between the neutrinos origin and detection additionally we explore the capability of a perturbative method for calculating neutrino oscillation probabilities and whether this method is suitable for dune we also briefly quantitatively explore the ability of dune to measure the earths matter density and the impact of performing this measurement on measuring standard neutrino oscillation parameters | [['quantum', 'mechanical', 'interactions', 'between', 'neutrinos', 'and', 'matter', 'along', 'the', 'path', 'of', 'propagation', 'the', 'wolfenstein', 'matter', 'effect', 'are', 'of', 'particular', 'importance', 'for', 'the', 'upcoming', 'longbaseline', 'neutrino', 'oscillation', 'experiments', 'specifically', 'the', 'deep', 'underground', 'neutrino', 'experiment', 'dune', 'here', 'we', 'explore', 'specifically', 'what', 'about', 'the', 'matter', 'density', 'profile', 'can', 'be', 'measured', 'by', 'dune', 'considering', 'both', 'the', 'shape', 'and', 'normalization', 'of', 'the', 'profile', 'between', 'the', 'neutrinos', 'origin', 'and', 'detection', 'additionally', 'we', 'explore', 'the', 'capability', 'of', 'a', 'perturbative', 'method', 'for', 'calculating', 'neutrino', 'oscillation', 'probabilities', 'and', 'whether', 'this', 'method', 'is', 'suitable', 'for', 'dune', 'we', 'also', 'briefly', 'quantitatively', 'explore', 'the', 'ability', 'of', 'dune', 'to', 'measure', 'the', 'earths', 'matter', 'density', 'and', 'the', 'impact', 'of', 'performing', 'this', 'measurement', 'on', 'measuring', 'standard', 'neutrino', 'oscillation', 'parameters']] | [-0.07229507990638938, 0.2340374618539946, -0.08971566754534203, 0.18185082559469729, -0.0834320048360448, -0.07960920675919113, 0.031153173504495306, 0.33122533210144756, -0.2615872589552677, -0.33830693942543705, 0.04593101988154415, -0.27736004638861406, -0.1311885951037862, 0.18660954775068125, 0.0628811213874111, 0.059527285654391894, 0.06517258860791723, -0.006159553688280938, -0.10471435787621886, -0.2012247403332016, 0.3072022281244005, 0.16734274388612616, 0.2797311063684327, 0.09616901698571287, 0.11219082264180638, -0.024054594854660855, -0.09334250355727579, -0.04419622437521946, -0.17165109275415408, 0.05183195087470507, 0.20797680708857483, 0.17489380155395912, 0.14670808039801686, -0.43478669299695055, -0.20701036646373963, 0.1910896319732593, 0.12588953494355737, 0.09944175016298368, -0.06719814516755082, -0.3449063998434627, 0.03231159381654212, -0.20079706041469125, -0.14360731520297887, -0.05512792751062335, -0.04119047572378788, 0.01374387934297454, -0.2281155623332189, 0.07801424317330473, -0.04945811632971622, 0.009743749744079093, -0.021108171879109648, -0.11680404204679162, 0.05214741618552229, 0.0829678934614844, 0.09391459657426662, -0.04957338372090211, 0.15124867475395531, -0.19374861350903907, -0.04468692233173275, 0.39299067482352257, -0.11479315250752527, -0.1522597384643169, 0.11972975029544741, -0.1894608660437179, -0.07242945271642193, 0.0281077521738776, 0.19050991995129407, 0.04120184324289623, -0.13084060484298357, 0.08016052439945684, -0.04613763791827583, 0.15763391738986238, 0.08168085675948021, -0.0016755716877237877, 0.3081215825971556, 0.2679186913913949, 0.08695403809185352, -0.04546204128245447, -0.22562807915413655, -0.00653615572669527, -0.33787642227355064, -0.13051933643261068, -0.10593908368568998, 0.01162535153337542, -0.04253496323533973, -0.093681998305807, 0.45546904696445717, 0.196041508108018, 0.16370172047244155, -0.000979291757143903, 0.3288694872243101, 0.02120866249683068, -0.011239004199875094, -0.02296185811671118, 0.332850604987981, 0.1397882113442552, 0.10849969929263911, -0.33713928675850885, 0.06729900533447794, 0.03829220576587607] |
1,802.06785 | Primordial Black Hole Dark Matter and LIGO/Virgo Merger Rate from
Inflation with Running Spectral Indices: Formation in the Matter- and/or
Radiation-Dominated Universe | We study possibilities to explain the whole dark matter abundance by
primordial black holes (PBHs) or to explain the merger rate of binary black
holes estimated from the gravitational wave detections by LIGO/Virgo. We assume
that the PBHs are originated in a radiation- or matter-dominated era from large
primordial curvature perturbation generated by inflation. We take a simple
model-independent approach considering inflation with large running spectral
indices which are parametrized by $n_\text{s}, \alpha_\text{s}$, and
$\beta_\text{s}$ consistent with the observational bounds. The merger rate is
fitted by PBHs with masses of $\mathcal{O}(10)$ $M_{\odot}$ produced in the
radiation-dominated era. Then the running of running should be $\beta_\text{s}
\sim 0.025$, which can be tested by future observation. On the other hand, the
whole abundance of dark matter is consistent with PBHs with masses of asteroids
($\mathcal{O}(10^{-17})~M_{\odot}$) produced in an early matter-dominated era
if a set of running parameters are properly realized.
| astro-ph.CO gr-qc hep-ph hep-th | we study possibilities to explain the whole dark matter abundance by primordial black holes pbhs or to explain the merger rate of binary black holes estimated from the gravitational wave detections by ligovirgo we assume that the pbhs are originated in a radiation or matterdominated era from large primordial curvature perturbation generated by inflation we take a simple modelindependent approach considering inflation with large running spectral indices which are parametrized by n_texts alpha_texts and beta_texts consistent with the observational bounds the merger rate is fitted by pbhs with masses of mathcalo10 m_odot produced in the radiationdominated era then the running of running should be beta_texts sim 0025 which can be tested by future observation on the other hand the whole abundance of dark matter is consistent with pbhs with masses of asteroids mathcalo1017m_odot produced in an early matterdominated era if a set of running parameters are properly realized | [['we', 'study', 'possibilities', 'to', 'explain', 'the', 'whole', 'dark', 'matter', 'abundance', 'by', 'primordial', 'black', 'holes', 'pbhs', 'or', 'to', 'explain', 'the', 'merger', 'rate', 'of', 'binary', 'black', 'holes', 'estimated', 'from', 'the', 'gravitational', 'wave', 'detections', 'by', 'ligovirgo', 'we', 'assume', 'that', 'the', 'pbhs', 'are', 'originated', 'in', 'a', 'radiation', 'or', 'matterdominated', 'era', 'from', 'large', 'primordial', 'curvature', 'perturbation', 'generated', 'by', 'inflation', 'we', 'take', 'a', 'simple', 'modelindependent', 'approach', 'considering', 'inflation', 'with', 'large', 'running', 'spectral', 'indices', 'which', 'are', 'parametrized', 'by', 'n_texts', 'alpha_texts', 'and', 'beta_texts', 'consistent', 'with', 'the', 'observational', 'bounds', 'the', 'merger', 'rate', 'is', 'fitted', 'by', 'pbhs', 'with', 'masses', 'of', 'mathcalo10', 'm_odot', 'produced', 'in', 'the', 'radiationdominated', 'era', 'then', 'the', 'running', 'of', 'running', 'should', 'be', 'beta_texts', 'sim', '0025', 'which', 'can', 'be', 'tested', 'by', 'future', 'observation', 'on', 'the', 'other', 'hand', 'the', 'whole', 'abundance', 'of', 'dark', 'matter', 'is', 'consistent', 'with', 'pbhs', 'with', 'masses', 'of', 'asteroids', 'mathcalo1017m_odot', 'produced', 'in', 'an', 'early', 'matterdominated', 'era', 'if', 'a', 'set', 'of', 'running', 'parameters', 'are', 'properly', 'realized']] | [-0.1105009937606804, 0.2451089109381428, -0.07858641181544929, 0.13683039620616375, -0.09774759964906721, -0.07600083408903305, -0.036370884518015324, 0.2999180981146914, -0.15356714761705248, -0.3778724514071706, 0.09488013823161723, -0.2854938695607772, -0.021904935597904497, 0.2186891793113013, -0.0029807331795980046, 0.011569823156325864, 0.08349045429873717, -0.016358611805664076, -0.016940036532957548, -0.2909403974711374, 0.34316138633920884, 0.10625651877347406, 0.11669775024032011, -0.03779593001972962, 0.02774973917049128, -0.10612162206504312, -0.047931975069605594, -0.010685150980480484, -0.18883139656054163, 0.028961505122170165, 0.207892779332514, 0.19703446509287256, 0.1733184705709817, -0.43300051212154483, -0.2525595363320692, 0.17239274989839617, 0.15655082510132995, 0.09636022754736454, -0.12736261304927066, -0.33444195114795794, 0.0991369486583716, -0.2538166332768498, -0.10186625801384412, 0.006755119033314131, 0.007581043327422617, -0.02303612548890491, -0.2652207780955034, 0.12725695599093578, -0.03969872979385374, -0.11823607465069923, -0.08023036527284584, -0.07566757690018186, -0.05289339505207653, -0.004504936818893139, 0.1428012496049327, 0.023823814686400803, 0.20456845212037433, -0.1087263448626272, -0.06211159832391341, 0.4045405213271717, -0.19190784727412086, -0.01874663021702033, 0.10195637334112104, -0.20255603753942084, -0.1580947384700648, 0.12215231951013521, 0.1584248183542615, 0.10669201249224167, -0.13824588742914734, 0.10862371337175096, 0.07289103739677157, 0.22273991990287403, 0.12700902607936698, 0.013031594149143129, 0.4429408383874835, 0.15150546811527565, 0.00020194697923228873, 0.036849522105519096, -0.05748893052723806, -0.03281533989120744, -0.28412049867365824, -0.06771607422212894, -0.20269125936409602, 0.0949675087784246, -0.1885520594447511, -0.11094750322554574, 0.3394683714487127, 0.10903112388743491, 0.24995143823586144, 0.057880742392352934, 0.307002936206016, 0.10270186251046061, 0.06110792050880569, 0.10207118043982118, 0.3758728116542309, 0.0865043632432141, 0.06328211060132492, -0.17140631910439555, 0.04167632225223563, 0.0038529418317692263] |
1,802.06786 | Star-forming galaxies are predicted to lie on a fundamental plane of
mass, star formation rate and \alpha-enhancement | Observations show that star-forming galaxies reside on a tight
three-dimensional plane between mass, gas-phase metallicity and star formation
rate (SFR), which can be explained by the interplay between metal-poor gas
inflows, SFR and outflows. However, different metals are released on different
time-scales, which may affect the slope of this relation. Here, we use central,
star-forming galaxies with M$_{\rm star}=10^{9.0-10.5}$ M$_{\odot}$ from the
EAGLE hydrodynamical simulation to examine three-dimensional relations between
mass, SFR and chemical enrichment using absolute and relative C, N, O and Fe
abundances. We show that the scatter is smaller when gas-phase
$\alpha$-enhancement is used rather than metallicity. A similar plane also
exists for stellar $\alpha$-enhancement, implying that present-day specific
SFRs are correlated with long time-scale star formation histories. Between
$z=0$ and 1, the $\alpha$-enhancement plane is even more insensitive to
redshift than the plane using metallicity. However, it evolves at $z>1$ due to
lagging iron yields. At fixed mass, galaxies with higher SFRs have star
formation histories shifted toward late times, are more $\alpha$-enhanced and
this $\alpha$-enhancement increases with redshift as observed. These findings
suggest that relations between physical properties inferred from observations
may be affected by systematic variations in $\alpha$-enhancements.
| astro-ph.GA | observations show that starforming galaxies reside on a tight threedimensional plane between mass gasphase metallicity and star formation rate sfr which can be explained by the interplay between metalpoor gas inflows sfr and outflows however different metals are released on different timescales which may affect the slope of this relation here we use central starforming galaxies with m_rm star1090105 m_odot from the eagle hydrodynamical simulation to examine threedimensional relations between mass sfr and chemical enrichment using absolute and relative c n o and fe abundances we show that the scatter is smaller when gasphase alphaenhancement is used rather than metallicity a similar plane also exists for stellar alphaenhancement implying that presentday specific sfrs are correlated with long timescale star formation histories between z0 and 1 the alphaenhancement plane is even more insensitive to redshift than the plane using metallicity however it evolves at z1 due to lagging iron yields at fixed mass galaxies with higher sfrs have star formation histories shifted toward late times are more alphaenhanced and this alphaenhancement increases with redshift as observed these findings suggest that relations between physical properties inferred from observations may be affected by systematic variations in alphaenhancements | [['observations', 'show', 'that', 'starforming', 'galaxies', 'reside', 'on', 'a', 'tight', 'threedimensional', 'plane', 'between', 'mass', 'gasphase', 'metallicity', 'and', 'star', 'formation', 'rate', 'sfr', 'which', 'can', 'be', 'explained', 'by', 'the', 'interplay', 'between', 'metalpoor', 'gas', 'inflows', 'sfr', 'and', 'outflows', 'however', 'different', 'metals', 'are', 'released', 'on', 'different', 'timescales', 'which', 'may', 'affect', 'the', 'slope', 'of', 'this', 'relation', 'here', 'we', 'use', 'central', 'starforming', 'galaxies', 'with', 'm_rm', 'star1090105', 'm_odot', 'from', 'the', 'eagle', 'hydrodynamical', 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1,802.06787 | Observing multiple populations in globular clusters with the ESO
archive: NGC 6388 reloaded | The metal-rich and old bulge globular cluster (GC) NGC 6388 is one of the
most massive Galactic GCs (M ~ 10^6 Msun). However, the spectroscopic
properties of its multiple stellar populations rested only on 32 red giants
(only seven of which observed with UVES, the remaining with GIRAFFE), given the
difficulties in observing a rather distant cluster, heavily contaminated by
bulge and disc field stars. We bypassed the problem using the largest telescope
facility ever: the European Southern Observatory (ESO) archive. By selecting
member stars identified by other programmes, we derive atmospheric parameters
and the full set of abundances for 15 species from high resolution UVES spectra
of another 17 red giant branch stars in NGC 6388. We confirm that no
metallicity dispersion is appreciable in this GC. About 30% of stars show the
primordial composition of first generation stars, about 20% present an
extremely modified second generation composition, and half of the stars has an
intermediate composition. The stars clearly distribute in the Al-O and Na-O
planes into three discrete groups. We find substantial hints that more than a
single class of polluters is required to reproduce the composition of the
intermediate component in NGC 6388. In the heavily polluted component the sum
Mg+Al increases as Al increases. The sum Mg+Al+Si is constant, and is the
fossil record of hot H-burning at temperatures higher than about 70 MK in the
first generation polluters that contributed to form multiple populations in
this cluster.
| astro-ph.SR astro-ph.GA | the metalrich and old bulge globular cluster gc ngc 6388 is one of the most massive galactic gcs m 106 msun however the spectroscopic properties of its multiple stellar populations rested only on 32 red giants only seven of which observed with uves the remaining with giraffe given the difficulties in observing a rather distant cluster heavily contaminated by bulge and disc field stars we bypassed the problem using the largest telescope facility ever the european southern observatory eso archive by selecting member stars identified by other programmes we derive atmospheric parameters and the full set of abundances for 15 species from high resolution uves spectra of another 17 red giant branch stars in ngc 6388 we confirm that no metallicity dispersion is appreciable in this gc about 30 of stars show the primordial composition of first generation stars about 20 present an extremely modified second generation composition and half of the stars has an intermediate composition the stars clearly distribute in the alo and nao planes into three discrete groups we find substantial hints that more than a single class of polluters is required to reproduce the composition of the intermediate component in ngc 6388 in the heavily polluted component the sum mgal increases as al increases the sum mgalsi is constant and is the fossil record of hot hburning at temperatures higher than about 70 mk in the first generation polluters that contributed to form multiple populations in this cluster | [['the', 'metalrich', 'and', 'old', 'bulge', 'globular', 'cluster', 'gc', 'ngc', '6388', 'is', 'one', 'of', 'the', 'most', 'massive', 'galactic', 'gcs', 'm', '106', 'msun', 'however', 'the', 'spectroscopic', 'properties', 'of', 'its', 'multiple', 'stellar', 'populations', 'rested', 'only', 'on', '32', 'red', 'giants', 'only', 'seven', 'of', 'which', 'observed', 'with', 'uves', 'the', 'remaining', 'with', 'giraffe', 'given', 'the', 'difficulties', 'in', 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1,802.06788 | Probing sub-GeV Dark Matter-Baryon Scattering with Cosmological
Observables | We derive new limits on the elastic scattering cross-section between baryons
and dark matter using Cosmic Microwave Background data from the Planck
satellite and measurements of the Lyman-alpha forest flux power spectrum from
the Sloan Digital Sky Survey. Our analysis addresses generic cross sections of
the form $\sigma\propto v^n$, where v is the dark matter-baryon relative
velocity, allowing for constraints on the cross section independent of specific
particle physics models. We include high-$\ell$ polarization data from Planck
in our analysis, improving over previous constraints. We apply a more careful
treatment of dark matter thermal evolution than previously done, allowing us to
extend our constraints down to dark matter masses of $\sim$MeV. We show in this
work that cosmological probes are complementary to current direct detection and
astrophysical searches.
| astro-ph.CO hep-ph | we derive new limits on the elastic scattering crosssection between baryons and dark matter using cosmic microwave background data from the planck satellite and measurements of the lymanalpha forest flux power spectrum from the sloan digital sky survey our analysis addresses generic cross sections of the form sigmapropto vn where v is the dark matterbaryon relative velocity allowing for constraints on the cross section independent of specific particle physics models we include highell polarization data from planck in our analysis improving over previous constraints we apply a more careful treatment of dark matter thermal evolution than previously done allowing us to extend our constraints down to dark matter masses of simmev we show in this work that cosmological probes are complementary to current direct detection and astrophysical searches | [['we', 'derive', 'new', 'limits', 'on', 'the', 'elastic', 'scattering', 'crosssection', 'between', 'baryons', 'and', 'dark', 'matter', 'using', 'cosmic', 'microwave', 'background', 'data', 'from', 'the', 'planck', 'satellite', 'and', 'measurements', 'of', 'the', 'lymanalpha', 'forest', 'flux', 'power', 'spectrum', 'from', 'the', 'sloan', 'digital', 'sky', 'survey', 'our', 'analysis', 'addresses', 'generic', 'cross', 'sections', 'of', 'the', 'form', 'sigmapropto', 'vn', 'where', 'v', 'is', 'the', 'dark', 'matterbaryon', 'relative', 'velocity', 'allowing', 'for', 'constraints', 'on', 'the', 'cross', 'section', 'independent', 'of', 'specific', 'particle', 'physics', 'models', 'we', 'include', 'highell', 'polarization', 'data', 'from', 'planck', 'in', 'our', 'analysis', 'improving', 'over', 'previous', 'constraints', 'we', 'apply', 'a', 'more', 'careful', 'treatment', 'of', 'dark', 'matter', 'thermal', 'evolution', 'than', 'previously', 'done', 'allowing', 'us', 'to', 'extend', 'our', 'constraints', 'down', 'to', 'dark', 'matter', 'masses', 'of', 'simmev', 'we', 'show', 'in', 'this', 'work', 'that', 'cosmological', 'probes', 'are', 'complementary', 'to', 'current', 'direct', 'detection', 'and', 'astrophysical', 'searches']] | [-0.06541698501041537, 0.0825268589251209, -0.09812993061495945, 0.07955211245644023, -0.1486503980067937, -0.05413699876589817, 0.02977503082365729, 0.30100441831018543, -0.20087133825836645, -0.37011038195123547, 0.019111771316602244, -0.33762248096900294, 0.016812625202874187, 0.25158485799966, 0.053544943908491405, 0.04682069468617556, 0.012795180211469415, -0.056418337881041225, -0.009646126121879206, -0.2645155333357252, 0.31648219192720717, 0.11456045405429904, 0.24767141916163382, 0.04520146970025962, 0.06056143261776015, 0.031535297817754326, -0.1833480944551411, -0.01595581199217122, -0.20612441406984772, 0.08155317859927891, 0.21360015293558376, 0.1508379994724578, 0.09640357890748419, -0.41812963808479253, -0.21692683269066038, 0.16734907232239493, 0.15010699741105782, 0.1448327097496076, -0.04485778632135862, -0.3178398525888042, 0.022137576022942085, -0.17950352685147664, -0.06703448731059325, -0.03714488565128704, -0.026863904331548838, 0.011057528101446223, -0.22992860417434713, 0.13977931232147967, -0.028155011039132205, -0.015181250777459354, -0.09903712595405523, -0.14143365785639617, -0.03831644730234984, 0.03358978915775879, 0.05425964650748938, -0.007413287174131256, 0.21282260743464576, -0.17353682315933838, -0.06953512408654206, 0.40095828170888126, -0.12716237914321482, -0.1002917850328231, 0.14316734702515532, -0.16951884680747753, -0.19526766269336804, 0.11914528490797238, 0.20443653509607884, 0.059496796652638295, -0.16289914862863952, 0.12627040708184722, -0.019355042707502434, 0.21537048716163554, 0.0717660336854351, 0.026229457926092437, 0.3129559101507766, 0.17950424984155688, 0.08415456040529534, 0.03722875369930989, -0.16255031212313042, -0.01339841267963493, -0.3316375601643813, -0.08747611275794043, -0.11616869773570215, 0.052205857386979915, -0.08676970771045944, -0.07830379069491755, 0.33909959071570484, 0.184484232753789, 0.23820538909058087, 0.06963796704985725, 0.3953040175692877, 0.04969934277141874, 0.035170017454220215, 0.024227825277193915, 0.33069204808271024, 0.17179354498512112, 0.12101313522271084, -0.18780592524308304, -0.035994856734760106, -0.031498397493123775] |
1,802.06789 | Functional Determinants of Radial Operators in $AdS_2$ | We study the zeta-function regularization of functional determinants of
Laplace and Dirac-type operators in two-dimensional Euclidean $AdS_2$ space.
More specifically, we consider the ratio of determinants between an operator in
the presence of background fields with circular symmetry and the free operator
in which the background fields are absent. By Fourier-transforming the angular
dependence, one obtains an infinite number of one-dimensional radial operators,
the determinants of which are easy to compute. The summation over modes is then
treated with care so as to guarantee that the result coincides with the
two-dimensional zeta-function formalism. The method relies on some well-known
techniques to compute functional determinants using contour integrals and the
construction of the Jost function from scattering theory. Our work generalizes
some known results in flat space. The extension to conformal $AdS_2$ geometries
is also considered. We provide two examples, one bosonic and one fermionic,
borrowed from the spectrum of fluctuations of the holographic $\frac{1}{4}$-BPS
latitude Wilson loop.
| hep-th | we study the zetafunction regularization of functional determinants of laplace and diractype operators in twodimensional euclidean ads_2 space more specifically we consider the ratio of determinants between an operator in the presence of background fields with circular symmetry and the free operator in which the background fields are absent by fouriertransforming the angular dependence one obtains an infinite number of onedimensional radial operators the determinants of which are easy to compute the summation over modes is then treated with care so as to guarantee that the result coincides with the twodimensional zetafunction formalism the method relies on some wellknown techniques to compute functional determinants using contour integrals and the construction of the jost function from scattering theory our work generalizes some known results in flat space the extension to conformal ads_2 geometries is also considered we provide two examples one bosonic and one fermionic borrowed from the spectrum of fluctuations of the holographic frac14bps latitude wilson loop | [['we', 'study', 'the', 'zetafunction', 'regularization', 'of', 'functional', 'determinants', 'of', 'laplace', 'and', 'diractype', 'operators', 'in', 'twodimensional', 'euclidean', 'ads_2', 'space', 'more', 'specifically', 'we', 'consider', 'the', 'ratio', 'of', 'determinants', 'between', 'an', 'operator', 'in', 'the', 'presence', 'of', 'background', 'fields', 'with', 'circular', 'symmetry', 'and', 'the', 'free', 'operator', 'in', 'which', 'the', 'background', 'fields', 'are', 'absent', 'by', 'fouriertransforming', 'the', 'angular', 'dependence', 'one', 'obtains', 'an', 'infinite', 'number', 'of', 'onedimensional', 'radial', 'operators', 'the', 'determinants', 'of', 'which', 'are', 'easy', 'to', 'compute', 'the', 'summation', 'over', 'modes', 'is', 'then', 'treated', 'with', 'care', 'so', 'as', 'to', 'guarantee', 'that', 'the', 'result', 'coincides', 'with', 'the', 'twodimensional', 'zetafunction', 'formalism', 'the', 'method', 'relies', 'on', 'some', 'wellknown', 'techniques', 'to', 'compute', 'functional', 'determinants', 'using', 'contour', 'integrals', 'and', 'the', 'construction', 'of', 'the', 'jost', 'function', 'from', 'scattering', 'theory', 'our', 'work', 'generalizes', 'some', 'known', 'results', 'in', 'flat', 'space', 'the', 'extension', 'to', 'conformal', 'ads_2', 'geometries', 'is', 'also', 'considered', 'we', 'provide', 'two', 'examples', 'one', 'bosonic', 'and', 'one', 'fermionic', 'borrowed', 'from', 'the', 'spectrum', 'of', 'fluctuations', 'of', 'the', 'holographic', 'frac14bps', 'latitude', 'wilson', 'loop']] | [-0.13271160814599697, 0.10617210318584286, -0.07789755550622465, 0.09945393302240617, -0.06562117569646828, -0.09246512924789622, -0.017238752552379326, 0.3271878546958042, -0.21240636403820698, -0.23396428099871988, 0.104571814025948, -0.3110248271826726, -0.1828509114985206, 0.19154712466143403, -0.03611115691145277, 0.052549987669535884, -0.012792106014884012, 0.0627400329157452, -0.12813444251482298, -0.2356269584366589, 0.3743214318795711, 0.030509712563080202, 0.2573883098544209, 0.06227775142308633, 0.07614049144759537, 0.052017284699591104, -0.04038895889642132, -0.02340519524128977, -0.11023633060021257, 0.1342851094787371, 0.22220100717660585, 0.0583867484697728, 0.19775037526799616, -0.4206786855141733, -0.19901580682486314, 0.08445312156694923, 0.15804173255185033, 0.07432297851955577, 0.01637237469966384, -0.2629758683181587, 0.011342132278676531, -0.14524712287642916, -0.19242086793832885, -0.10132608391087988, -0.03256972099411165, -0.024420919639776183, -0.2541662138978696, 0.07848258071655413, 0.019291046130393816, 0.04935138407430262, -0.08611905749977691, -0.12068027250356023, -0.03276687723015002, 0.09870508647446705, 0.12469521151769575, 0.03027714130017835, 0.10385500144133356, -0.09446785905677232, -0.11712521228977853, 0.33749905302764693, -0.09732137257781971, -0.26090935166854007, 0.1308508277544455, -0.17453425097320774, -0.1226086023435661, 0.1043044244805199, 0.09980603860940333, 0.1650559741493528, -0.1319292541089094, 0.1723520935462657, -0.05118542572685108, 0.08480111295546429, 0.09923051173686032, 0.05659874339712558, 0.1606950828075931, 0.048677154345835326, 0.06839280024135283, 0.17166178385359324, -0.060315006277612916, -0.14058568269002494, -0.34172262639255163, -0.1559424613570065, -0.19461434179617412, 0.05242924433450695, -0.12373938971417096, -0.23453368312400427, 0.3935381843642462, 0.1328819455428955, 0.20008136912480376, 0.06830044935018441, 0.2552252928637395, 0.1595483079855182, 0.10037914443476374, 0.0630246811000642, 0.17007113660346113, 0.18645411254956748, 0.0653429021851225, -0.22301134853964896, -0.0846071320253715, 0.17348549103921956] |
1,802.0679 | Embedded Topological Insulators | We present a generalization of free fermionic topological insulators that are
composed of topological subsystems of differing dimensionality. We specifically
focus on topological subsystems of nonzero co-dimension are embedded within a
trivial insulating environment. A general procedure is described to isolate and
classify such embedded topological insulators and we present three
representative examples in varying dimensions and symmetry classes. Moreover,
we demonstrate with concrete examples that the presence of periodically
embedded topological insulators in an otherwise trivially classified system can
lead to topologically non-trivial physical phenomena on crystalline defects;
namely, novel topological surface/edge modes at stacking faults and partial
edge dislocations.
| cond-mat.mes-hall | we present a generalization of free fermionic topological insulators that are composed of topological subsystems of differing dimensionality we specifically focus on topological subsystems of nonzero codimension are embedded within a trivial insulating environment a general procedure is described to isolate and classify such embedded topological insulators and we present three representative examples in varying dimensions and symmetry classes moreover we demonstrate with concrete examples that the presence of periodically embedded topological insulators in an otherwise trivially classified system can lead to topologically nontrivial physical phenomena on crystalline defects namely novel topological surfaceedge modes at stacking faults and partial edge dislocations | [['we', 'present', 'a', 'generalization', 'of', 'free', 'fermionic', 'topological', 'insulators', 'that', 'are', 'composed', 'of', 'topological', 'subsystems', 'of', 'differing', 'dimensionality', 'we', 'specifically', 'focus', 'on', 'topological', 'subsystems', 'of', 'nonzero', 'codimension', 'are', 'embedded', 'within', 'a', 'trivial', 'insulating', 'environment', 'a', 'general', 'procedure', 'is', 'described', 'to', 'isolate', 'and', 'classify', 'such', 'embedded', 'topological', 'insulators', 'and', 'we', 'present', 'three', 'representative', 'examples', 'in', 'varying', 'dimensions', 'and', 'symmetry', 'classes', 'moreover', 'we', 'demonstrate', 'with', 'concrete', 'examples', 'that', 'the', 'presence', 'of', 'periodically', 'embedded', 'topological', 'insulators', 'in', 'an', 'otherwise', 'trivially', 'classified', 'system', 'can', 'lead', 'to', 'topologically', 'nontrivial', 'physical', 'phenomena', 'on', 'crystalline', 'defects', 'namely', 'novel', 'topological', 'surfaceedge', 'modes', 'at', 'stacking', 'faults', 'and', 'partial', 'edge', 'dislocations']] | [-0.23184656383156185, 0.2151849435258825, -0.0005725498984355738, 0.01910062053063331, -0.050224134670847125, -0.20695599052815303, 0.01808823017163737, 0.37047762274373286, -0.24335819161912003, -0.276943720535993, 0.0658739226671987, -0.3101073159734801, -0.20680796270982574, 0.131349322685769, -0.08076330193659605, 0.024958865689390368, -0.03237791716277894, -0.04752133643983098, -0.11153131156772522, -0.2659717461020492, 0.37771438230935594, -0.1335350844714016, 0.2766732097428181, 0.030528922145725182, 0.03219919996151682, -0.03928991127067642, 0.06466959471961871, 0.09517995153304816, -0.15186270182600156, 0.0816684757442315, 0.273481539261555, -0.059275798379710996, 0.1304494356529068, -0.4863043319581464, -0.23557023379472222, 0.05410388182147895, 0.13135940562196002, 0.12439083340255046, -0.07957626574345412, -0.353273400732565, 0.13963312751931684, -0.17514032247190428, -0.10859940680536893, -0.16558357314344976, -0.0022564481132396376, -0.08311340453029417, -0.1558042186897912, 0.033391071764733826, 0.08112554910528187, 0.09706841302545174, -0.0819759105112044, -0.03903593614439268, -0.10696162738938733, 0.09802413675565236, -0.014102372990939582, -0.057654775356375934, 0.1277549410674555, -0.10686361423167999, -0.17752365656496755, 0.38101225107502523, 0.0023157430771221913, -0.21274728891508893, 0.29411238592376215, -0.05312797073551481, -0.1758298539547342, 0.1135125460591868, 0.18461368832792532, 0.10778738260453585, -0.05861209604040821, 0.09566853071874443, -0.02789542151356835, 0.17153180546431554, 0.010588952720552535, 0.12267497312657923, 0.2813762509964849, 0.15194875447282402, 0.08199370780609327, 0.24736036473682316, -0.042423623203678, -0.05338919376677806, -0.3274380680298119, -0.22027121859574966, -0.22341851750849792, 0.06699538205307679, -0.04711812604904535, -0.25356884787578393, 0.46776509067357175, 0.11688069819127231, 0.16360717578468345, -0.04771910625334719, 0.2241403323017282, 0.08051122967983679, 0.04621856686852799, 0.044411487208845295, 0.16179512868782892, 0.09792468356116131, -0.01764068147628614, -0.1505259961260962, -0.009882701159740733, 0.08514896088676287] |
1,802.06791 | Search for low-frequency diffuse radio emission around a shock in the
massive galaxy cluster MACS J0744.9+3927 | Merging galaxy clusters produce low Mach number shocks in the intracluster
medium. These shocks can accelerate electrons to relativistic energies that are
detectable at radio frequencies. MACS J0744.9+3927 is a massive ($M_{500} =
(11.8 \pm 2.8) \times 10^{14} M_{\odot}$), high-redshift ($z=0.6976$) cluster
where a Bullet-type merger is presumed to have taken place. Sunyaev-Zel'dovich
maps from MUSTANG indicate that a shock, with Mach number $\mathcal{M} =
1.0-2.9$ and an extension of $\sim 200$ kpc, sits near the centre of the
cluster. The shock is also detected as a brightness and temperature
discontinuity in X-ray observations. To search for diffuse radio emission
associated with the merger, we have imaged the cluster with the LOw Frequency
ARray (LOFAR) at 120-165 MHz. Our LOFAR radio images reveal previously
undetected AGN emission, but do not show clear cluster-scale diffuse emission
in the form of a radio relic nor a radio halo. The region of the shock is on
the western edge of AGN lobe emission from the brightest cluster galaxy.
Correlating the flux of known shock-induced radio relics versus their size, we
find that the radio emission overlapping the shocked region in MACS
J0744.9+3927 is likely of AGN origin. We argue against the presence of a relic
caused by diffusive shock acceleration and suggest that the shock is too weak
to accelerate electrons from the intracluster medium.
| astro-ph.CO astro-ph.GA | merging galaxy clusters produce low mach number shocks in the intracluster medium these shocks can accelerate electrons to relativistic energies that are detectable at radio frequencies macs j074493927 is a massive m_500 118 pm 28 times 1014 m_odot highredshift z06976 cluster where a bullettype merger is presumed to have taken place sunyaevzeldovich maps from mustang indicate that a shock with mach number mathcalm 1029 and an extension of sim 200 kpc sits near the centre of the cluster the shock is also detected as a brightness and temperature discontinuity in xray observations to search for diffuse radio emission associated with the merger we have imaged the cluster with the low frequency array lofar at 120165 mhz our lofar radio images reveal previously undetected agn emission but do not show clear clusterscale diffuse emission in the form of a radio relic nor a radio halo the region of the shock is on the western edge of agn lobe emission from the brightest cluster galaxy correlating the flux of known shockinduced radio relics versus their size we find that the radio emission overlapping the shocked region in macs j074493927 is likely of agn origin we argue against the presence of a relic caused by diffusive shock acceleration and suggest that the shock is too weak to accelerate electrons from the intracluster medium | [['merging', 'galaxy', 'clusters', 'produce', 'low', 'mach', 'number', 'shocks', 'in', 'the', 'intracluster', 'medium', 'these', 'shocks', 'can', 'accelerate', 'electrons', 'to', 'relativistic', 'energies', 'that', 'are', 'detectable', 'at', 'radio', 'frequencies', 'macs', 'j074493927', 'is', 'a', 'massive', 'm_500', '118', 'pm', '28', 'times', '1014', 'm_odot', 'highredshift', 'z06976', 'cluster', 'where', 'a', 'bullettype', 'merger', 'is', 'presumed', 'to', 'have', 'taken', 'place', 'sunyaevzeldovich', 'maps', 'from', 'mustang', 'indicate', 'that', 'a', 'shock', 'with', 'mach', 'number', 'mathcalm', '1029', 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1,802.06792 | Star Formation Histories of the LEGUS Dwarf Galaxies (I): recent History
of NGC1705, NGC4449 and Holmberg II | We use HST observations from the Legacy Extragalactic UV Survey to
reconstruct the recent star formation histories (SFHs) of three actively
star-forming dwarf galaxies, NGC4449, Holmberg II and NGC1705, from their UV
color-magnitude diagrams (CMDs). We apply a CMD fitting technique using two
independent sets of stellar isochrones, PARSEC-COLIBRI and MIST, to assess the
uncertainties related to stellar evolution modelling. Irrespective of the
adopted stellar models, all the three dwarfs are found to have had almost
constant star formation rates (SFRs) in the last 100-200 Myr, with modest
enhancements (a factor of $\sim$2) above the 100 Myr-averaged-SFR. Significant
differences among the three dwarfs are found in the overall SFR, the timing of
the most recent peak and the SFR$/$area. The Initial Mass Function (IMF) of
NGC1705 and Holmberg II is consistent with a Salpeter slope down to $\approx$ 5
M$_{\odot}$, whereas it is slightly flatter, s$=-2.0$, in NGC4449. The SFHs
derived with the two different sets of stellar models are consistent with each
other, except for some quantitative details, attributable to their input
assumptions. They also share the drawback that all synthetic diagrams predict a
clear separation in color between upper main sequence and helium burning stars,
which is not apparent in the data. Since differential reddening, significant in
NGC4449, or unresolved binaries don't appear to be sufficient to fill the gap,
we suggest this calls for a revision of both sets of stellar evolutionary
tracks.
| astro-ph.GA | we use hst observations from the legacy extragalactic uv survey to reconstruct the recent star formation histories sfhs of three actively starforming dwarf galaxies ngc4449 holmberg ii and ngc1705 from their uv colormagnitude diagrams cmds we apply a cmd fitting technique using two independent sets of stellar isochrones parseccolibri and mist to assess the uncertainties related to stellar evolution modelling irrespective of the adopted stellar models all the three dwarfs are found to have had almost constant star formation rates sfrs in the last 100200 myr with modest enhancements a factor of sim2 above the 100 myraveragedsfr significant differences among the three dwarfs are found in the overall sfr the timing of the most recent peak and the sfrarea the initial mass function imf of ngc1705 and holmberg ii is consistent with a salpeter slope down to approx 5 m_odot whereas it is slightly flatter s20 in ngc4449 the sfhs derived with the two different sets of stellar models are consistent with each other except for some quantitative details attributable to their input assumptions they also share the drawback that all synthetic diagrams predict a clear separation in color between upper main sequence and helium burning stars which is not apparent in the data since differential reddening significant in ngc4449 or unresolved binaries dont appear to be sufficient to fill the gap we suggest this calls for a revision of both sets of stellar evolutionary tracks | [['we', 'use', 'hst', 'observations', 'from', 'the', 'legacy', 'extragalactic', 'uv', 'survey', 'to', 'reconstruct', 'the', 'recent', 'star', 'formation', 'histories', 'sfhs', 'of', 'three', 'actively', 'starforming', 'dwarf', 'galaxies', 'ngc4449', 'holmberg', 'ii', 'and', 'ngc1705', 'from', 'their', 'uv', 'colormagnitude', 'diagrams', 'cmds', 'we', 'apply', 'a', 'cmd', 'fitting', 'technique', 'using', 'two', 'independent', 'sets', 'of', 'stellar', 'isochrones', 'parseccolibri', 'and', 'mist', 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1,802.06793 | SDSS-IV MaNGA: Modelling the metallicity gradients of gas and stars -
radially dependent metal outflow vs IMF | In our previous work, we found that only two scenarios are capable of
reproducing the observed integrated mass-metallicity relations for the gas and
stellar components of local star-forming galaxies simultaneously. One scenario
invokes a time-dependent metal outflow loading factor with stronger outflows at
early times. The other scenario uses a time-dependent IMF slope with a steeper
IMF at early times. In this work, we extend our study to investigate the radial
profile of gas and stellar metallicity in local star-forming galaxies using
spatially resolved spectroscopic data from the SDSS-IV MaNGA survey. We find
that most galaxies show negative gradients in both gas and stellar metallicity
with steeper gradients in stellar metallicity. The stellar metallicity gradient
tend to be mass dependent with steeper gradients in more massive galaxies while
no clear mass dependence is found for the gas metallicity gradient. Then we
compare the observations with the predictions from a chemical evolution model
of the radial profiles of gas and stellar metallicities. We confirm that the
two scenarios proposed in our previous work are also required to explain the
metallicity gradients. Based on these two scenarios we successfully reproduce
the radial profiles of gas metallicity, stellar metallicity, stellar mass
surface density, and star formation rate (SFR) surface density simultaneously.
The origin of the negative gradient in stellar metallicity turns out to be
driven by either radially dependent metal outflow or IMF slope. In contrast,
the radial dependence of the gas metallicity is less constrained because of the
degeneracy in model parameters.
| astro-ph.GA astro-ph.CO | in our previous work we found that only two scenarios are capable of reproducing the observed integrated massmetallicity relations for the gas and stellar components of local starforming galaxies simultaneously one scenario invokes a timedependent metal outflow loading factor with stronger outflows at early times the other scenario uses a timedependent imf slope with a steeper imf at early times in this work we extend our study to investigate the radial profile of gas and stellar metallicity in local starforming galaxies using spatially resolved spectroscopic data from the sdssiv manga survey we find that most galaxies show negative gradients in both gas and stellar metallicity with steeper gradients in stellar metallicity the stellar metallicity gradient tend to be mass dependent with steeper gradients in more massive galaxies while no clear mass dependence is found for the gas metallicity gradient then we compare the observations with the predictions from a chemical evolution model of the radial profiles of gas and stellar metallicities we confirm that the two scenarios proposed in our previous work are also required to explain the metallicity gradients based on these two scenarios we successfully reproduce the radial profiles of gas metallicity stellar metallicity stellar mass surface density and star formation rate sfr surface density simultaneously the origin of the negative gradient in stellar metallicity turns out to be driven by either radially dependent metal outflow or imf slope in contrast the radial dependence of the gas metallicity is less constrained because of the degeneracy in model parameters | [['in', 'our', 'previous', 'work', 'we', 'found', 'that', 'only', 'two', 'scenarios', 'are', 'capable', 'of', 'reproducing', 'the', 'observed', 'integrated', 'massmetallicity', 'relations', 'for', 'the', 'gas', 'and', 'stellar', 'components', 'of', 'local', 'starforming', 'galaxies', 'simultaneously', 'one', 'scenario', 'invokes', 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1,802.06794 | Jupiter Analogues Orbit Stars with an Average Metallicity Close to that
of the Sun | Jupiter played an important role in determining the structure and
configuration of the Solar System. Whereas hot-Jupiter type exoplanets
preferentially form around metal-rich stars, the conditions required for the
formation of planets with masses, orbits and eccentricities comparable to
Jupiter (Jupiter analogues) are unknown. Using spectroscopic metallicities, we
show that stars hosting Jupiter analogues have an average metallicity close to
solar, in contrast to their hot-Jupiter and eccentric cool Jupiter
counterparts, which orbit stars with super-solar metallicities. Furthermore,
the eccentricities of Jupiter analogues increase with host star metallicity,
suggesting that planet-planet scatterings producing highly eccentric cool
Jupiters could be more common in metal-rich environments. To investigate a
possible explanation for these metallicity trends, we compare the observations
to numerical simulations, which indicate that metal-rich stars typically form
multiple Jupiters, leading to planet-planet interactions and, hence, a
prevalence of either eccentric cool Jupiters or hot-Jupiters with circularized
orbits. Although the samples are small and exhibit variations in their
metallicities, suggesting that numerous processes other than metallicity affect
the formation of planetary systems, the data in hand suggests that Jupiter
analogues and terrestrial-sized planets form around stars with average
metallicities close to solar, whereas high metallicity systems preferentially
host eccentric cool Jupiter or hot-Jupiters, indicating higher metallicity
systems may not be favorable for the formation of planetary systems akin to the
Solar System.
| astro-ph.EP | jupiter played an important role in determining the structure and configuration of the solar system whereas hotjupiter type exoplanets preferentially form around metalrich stars the conditions required for the formation of planets with masses orbits and eccentricities comparable to jupiter jupiter analogues are unknown using spectroscopic metallicities we show that stars hosting jupiter analogues have an average metallicity close to solar in contrast to their hotjupiter and eccentric cool jupiter counterparts which orbit stars with supersolar metallicities furthermore the eccentricities of jupiter analogues increase with host star metallicity suggesting that planetplanet scatterings producing highly eccentric cool jupiters could be more common in metalrich environments to investigate a possible explanation for these metallicity trends we compare the observations to numerical simulations which indicate that metalrich stars typically form multiple jupiters leading to planetplanet interactions and hence a prevalence of either eccentric cool jupiters or hotjupiters with circularized orbits although the samples are small and exhibit variations in their metallicities suggesting that numerous processes other than metallicity affect the formation of planetary systems the data in hand suggests that jupiter analogues and terrestrialsized planets form around stars with average metallicities close to solar whereas high metallicity systems preferentially host eccentric cool jupiter or hotjupiters indicating higher metallicity systems may not be favorable for the formation of planetary systems akin to the solar system | [['jupiter', 'played', 'an', 'important', 'role', 'in', 'determining', 'the', 'structure', 'and', 'configuration', 'of', 'the', 'solar', 'system', 'whereas', 'hotjupiter', 'type', 'exoplanets', 'preferentially', 'form', 'around', 'metalrich', 'stars', 'the', 'conditions', 'required', 'for', 'the', 'formation', 'of', 'planets', 'with', 'masses', 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1,802.06795 | UKIRT-2017-BLG-001Lb: A giant planet detected through the dust | We report the discovery of a giant planet in event UKIRT-2017-BLG-001,
detected by the UKIRT microlensing survey. The mass ratio between the planet
and its host is $q=1.50_{-0.14}^{+0.17}\times10^{-3}$, about 1.5 times the
Jupiter/Sun mass ratio. The event lies 0.35$^{\circ}$ from the Galactic center
and suffers from high extinction of $A_K=1.68$. Therefore, it could be detected
only by a near-infrared survey. The field also suffers from large spatial
differential extinction, which makes it difficult to estimate the source
properties required to derive the angular Einstein radius. Nevertheless, we
find evidence suggesting that the source is located in the far disk. If
correct, this would be the first source star of a microlensing event to be
identified as belonging to the far disk. We estimate the lens mass and distance
using a Bayesian analysis to find that the planet's mass is
$1.28^{+0.37}_{-0.44}\,M_{J}$, and it orbits a
$0.81^{+0.21}_{-0.27}\,M_{\odot}$ star at an instantaneous projected separation
of $4.18^{+0.96}_{-0.88}$ AU. The system is at a distance of
$6.3^{+1.6}_{-2.1}$ kpc, and so likely resides in the Galactic bulge. In
addition, we find a non-standard extinction curve in this field, in agreement
with previous results toward high-extinction fields near the Galactic center.
| astro-ph.EP | we report the discovery of a giant planet in event ukirt2017blg001 detected by the ukirt microlensing survey the mass ratio between the planet and its host is q150_014017times103 about 15 times the jupitersun mass ratio the event lies 035circ from the galactic center and suffers from high extinction of a_k168 therefore it could be detected only by a nearinfrared survey the field also suffers from large spatial differential extinction which makes it difficult to estimate the source properties required to derive the angular einstein radius nevertheless we find evidence suggesting that the source is located in the far disk if correct this would be the first source star of a microlensing event to be identified as belonging to the far disk we estimate the lens mass and distance using a bayesian analysis to find that the planets mass is 128037_044m_j and it orbits a 081021_027m_odot star at an instantaneous projected separation of 418096_088 au the system is at a distance of 6316_21 kpc and so likely resides in the galactic bulge in addition we find a nonstandard extinction curve in this field in agreement with previous results toward highextinction fields near the galactic center | [['we', 'report', 'the', 'discovery', 'of', 'a', 'giant', 'planet', 'in', 'event', 'ukirt2017blg001', 'detected', 'by', 'the', 'ukirt', 'microlensing', 'survey', 'the', 'mass', 'ratio', 'between', 'the', 'planet', 'and', 'its', 'host', 'is', 'q150_014017times103', 'about', '15', 'times', 'the', 'jupitersun', 'mass', 'ratio', 'the', 'event', 'lies', '035circ', 'from', 'the', 'galactic', 'center', 'and', 'suffers', 'from', 'high', 'extinction', 'of', 'a_k168', 'therefore', 'it', 'could', 'be', 'detected', 'only', 'by', 'a', 'nearinfrared', 'survey', 'the', 'field', 'also', 'suffers', 'from', 'large', 'spatial', 'differential', 'extinction', 'which', 'makes', 'it', 'difficult', 'to', 'estimate', 'the', 'source', 'properties', 'required', 'to', 'derive', 'the', 'angular', 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1,802.06796 | Semiclassical echo dynamics in the Sachdev-Ye-Kitaev model | The existence of a quantum butterfly effect in the form of exponential
sensitivity to small perturbations has been under debate for a long time.
Lately, this question gained increased interest due to the proposal to probe
chaotic dynamics and scrambling using out-of-time-order correlators. In this
work we study echo dynamics in the Sachdev-Ye-Kitaev model under effective time
reversal in a semiclassical approach. We demonstrate that small imperfections
introduced in the time-reversal procedure result in an exponential divergence
from the perfect echo, which allows to identify a Lyapunov exponent
$\lambda_L$. In particular, we find that $\lambda_L$ is twice the Lyapunov
exponent of the semiclassical equations of motion. This behavior is attributed
to the growth of an out-of-time-order double commutator that resembles an
out-of-time-order correlator.
| cond-mat.stat-mech cond-mat.dis-nn cond-mat.str-el hep-th quant-ph | the existence of a quantum butterfly effect in the form of exponential sensitivity to small perturbations has been under debate for a long time lately this question gained increased interest due to the proposal to probe chaotic dynamics and scrambling using outoftimeorder correlators in this work we study echo dynamics in the sachdevyekitaev model under effective time reversal in a semiclassical approach we demonstrate that small imperfections introduced in the timereversal procedure result in an exponential divergence from the perfect echo which allows to identify a lyapunov exponent lambda_l in particular we find that lambda_l is twice the lyapunov exponent of the semiclassical equations of motion this behavior is attributed to the growth of an outoftimeorder double commutator that resembles an outoftimeorder correlator | [['the', 'existence', 'of', 'a', 'quantum', 'butterfly', 'effect', 'in', 'the', 'form', 'of', 'exponential', 'sensitivity', 'to', 'small', 'perturbations', 'has', 'been', 'under', 'debate', 'for', 'a', 'long', 'time', 'lately', 'this', 'question', 'gained', 'increased', 'interest', 'due', 'to', 'the', 'proposal', 'to', 'probe', 'chaotic', 'dynamics', 'and', 'scrambling', 'using', 'outoftimeorder', 'correlators', 'in', 'this', 'work', 'we', 'study', 'echo', 'dynamics', 'in', 'the', 'sachdevyekitaev', 'model', 'under', 'effective', 'time', 'reversal', 'in', 'a', 'semiclassical', 'approach', 'we', 'demonstrate', 'that', 'small', 'imperfections', 'introduced', 'in', 'the', 'timereversal', 'procedure', 'result', 'in', 'an', 'exponential', 'divergence', 'from', 'the', 'perfect', 'echo', 'which', 'allows', 'to', 'identify', 'a', 'lyapunov', 'exponent', 'lambda_l', 'in', 'particular', 'we', 'find', 'that', 'lambda_l', 'is', 'twice', 'the', 'lyapunov', 'exponent', 'of', 'the', 'semiclassical', 'equations', 'of', 'motion', 'this', 'behavior', 'is', 'attributed', 'to', 'the', 'growth', 'of', 'an', 'outoftimeorder', 'double', 'commutator', 'that', 'resembles', 'an', 'outoftimeorder', 'correlator']] | [-0.1657106500588418, 0.1559915808402144, -0.16864876141695956, 0.09542303051462594, -0.014343976600633222, -0.12454691550474827, -0.003283527480983516, 0.29876219697402623, -0.2787951391153142, -0.19756677474190548, 0.06907041652631621, -0.2507766575792216, -0.21071910616426873, 0.1993333291606902, -0.0653538388650622, 0.12114651964379217, -0.016399197978898883, 0.04124747368893245, -0.06757013293975071, -0.2339185448401282, 0.2730366306614161, 0.06517042318733818, 0.31840186067894705, 0.07154745496411967, 0.07086234263189864, -0.005011948923451629, 0.02428382925113769, 0.005198826805150848, -0.15895509704226027, 0.04743055694138374, 0.18035138893824704, 0.06306386993047063, 0.2808045218793327, -0.40814131343873533, -0.20026132627958204, 0.122566525239452, 0.18366616580075001, 0.13627928191686156, -0.04766438154852003, -0.28489712831692965, 0.0679764583843147, -0.1885059083607502, -0.2000169448054782, -0.08262404298970127, 0.06935786678478485, -0.06642786484747383, -0.26527400905024107, 0.12131095436998886, 0.07735149216330875, 0.04861162803173671, -0.02395323578815347, 0.01708233058149737, 0.055427333181042496, 0.10108253880161641, 0.0975064660197245, 0.04032087709321224, 0.10459876656380852, -0.11823254101531111, -0.14020966110009003, 0.30908596330905347, -0.12570623019937335, -0.18121826291468554, 0.13421251621793925, -0.18815683773378047, -0.12405533035762789, 0.09688835559655132, 0.14330207187742963, 0.11359832280625899, -0.14978350558870934, 0.11506929738414891, -0.0345939720481089, 0.1754044889835868, 0.06348137280381308, 0.10633942219845163, 0.1715227280160397, 0.14708764025207033, 0.06257439958219363, 0.20087607397993162, -0.07618463495216234, -0.17016299522095701, -0.25222238101920763, -0.13323106510636618, -0.22515871814580832, 0.1309551408332659, -0.07629393906570589, -0.19026113942462375, 0.4214846036506711, 0.17216741560193582, 0.20150137996126904, 0.05402152700732061, 0.2607093016764649, 0.15504096066120188, 0.0941244508366941, 0.06214414319490571, 0.24129310619877273, 0.13761336844777916, 0.11958821353358709, -0.3086658929554155, 0.06244907656881383, 0.09113769347559873] |
1,802.06797 | Confining graphene plasmons to the ultimate limit | Graphene plasmons have recently attracted a great deal of attention because
of their tunability, long lifetime, and high degree of field confinement in the
vertical direction. Nearby metal gates have been shown to modify the graphene
plasmon dispersion and further confine their electric field. We study the
plasmons of a graphene sheet deposited on a metal, in the regime in which metal
bands do not hybridize with massless Dirac fermion bands. We derive exact
results for the dispersion and lifetime of the plasmons of such hybrid system,
taking into account metal nonlocalities. The graphene plasmon dispersion is
found to be acoustic and pushed down in energy towards the upper boundary of
the intraband graphene particle-hole continuum, thereby strongly enhancing the
vertical confinement of these excitations. Landau damping of such acoustic
plasmons due to particle-hole excitations in the metal gate is found to be
surprisingly weak, with quality factors exceeding $Q = 10^{2}$.
| cond-mat.mes-hall | graphene plasmons have recently attracted a great deal of attention because of their tunability long lifetime and high degree of field confinement in the vertical direction nearby metal gates have been shown to modify the graphene plasmon dispersion and further confine their electric field we study the plasmons of a graphene sheet deposited on a metal in the regime in which metal bands do not hybridize with massless dirac fermion bands we derive exact results for the dispersion and lifetime of the plasmons of such hybrid system taking into account metal nonlocalities the graphene plasmon dispersion is found to be acoustic and pushed down in energy towards the upper boundary of the intraband graphene particlehole continuum thereby strongly enhancing the vertical confinement of these excitations landau damping of such acoustic plasmons due to particlehole excitations in the metal gate is found to be surprisingly weak with quality factors exceeding q 102 | [['graphene', 'plasmons', 'have', 'recently', 'attracted', 'a', 'great', 'deal', 'of', 'attention', 'because', 'of', 'their', 'tunability', 'long', 'lifetime', 'and', 'high', 'degree', 'of', 'field', 'confinement', 'in', 'the', 'vertical', 'direction', 'nearby', 'metal', 'gates', 'have', 'been', 'shown', 'to', 'modify', 'the', 'graphene', 'plasmon', 'dispersion', 'and', 'further', 'confine', 'their', 'electric', 'field', 'we', 'study', 'the', 'plasmons', 'of', 'a', 'graphene', 'sheet', 'deposited', 'on', 'a', 'metal', 'in', 'the', 'regime', 'in', 'which', 'metal', 'bands', 'do', 'not', 'hybridize', 'with', 'massless', 'dirac', 'fermion', 'bands', 'we', 'derive', 'exact', 'results', 'for', 'the', 'dispersion', 'and', 'lifetime', 'of', 'the', 'plasmons', 'of', 'such', 'hybrid', 'system', 'taking', 'into', 'account', 'metal', 'nonlocalities', 'the', 'graphene', 'plasmon', 'dispersion', 'is', 'found', 'to', 'be', 'acoustic', 'and', 'pushed', 'down', 'in', 'energy', 'towards', 'the', 'upper', 'boundary', 'of', 'the', 'intraband', 'graphene', 'particlehole', 'continuum', 'thereby', 'strongly', 'enhancing', 'the', 'vertical', 'confinement', 'of', 'these', 'excitations', 'landau', 'damping', 'of', 'such', 'acoustic', 'plasmons', 'due', 'to', 'particlehole', 'excitations', 'in', 'the', 'metal', 'gate', 'is', 'found', 'to', 'be', 'surprisingly', 'weak', 'with', 'quality', 'factors', 'exceeding', 'q', '102']] | [-0.15515659476818505, 0.20651773366744056, -0.022570007295649966, 0.03004377816486888, -0.056328996877179835, -0.1607596621823972, 0.09291250091847895, 0.43543304887211676, -0.21208328710381708, -0.2931130695409629, -0.07253356248607538, -0.30118580340771683, -0.11549132497401426, 0.18340459042490886, 0.011533174287974091, 0.019250124344441868, -0.0027577597000296938, -0.08886727783366397, -0.041996697445757784, -0.174048525824008, 0.24844811167197905, 0.01730987196479807, 0.36369142227417584, 0.1561509556143193, 0.011475960261478329, -0.029513443568844767, 0.09224088546906332, -0.013502187772487469, -0.12069172908965227, 0.07829571349873202, 0.21760400575786112, -0.15400606591026267, 0.26044511048443963, -0.48296826826223477, -0.24939498949228533, -0.008013021830000624, 0.2259880933118059, 0.17228039070911433, -0.0658474149874763, -0.3064730225858704, 0.043151122243421165, -0.13292195569095125, -0.14813068953022016, -0.042010905531031505, 0.010907113635357445, -0.007996499851432365, -0.1913338278717861, 0.061428671396670506, 0.07423229482246946, 0.03426668955000049, -0.05666489987356576, -0.12478155713290938, -0.13402396770169503, 0.06774348386606535, 0.0876861621983448, 0.023222306481522466, 0.17872511755076811, -0.15528662897498402, -0.04061139727763782, 0.41257541796920316, -0.07595118174995512, -0.1730036632595769, 0.18752155488122577, -0.22008579407403453, -0.00017848986182485195, 0.20054434588030967, 0.18600994406656565, 0.054331893048909126, -0.11627338661978774, 0.10585827703297829, 0.002295736076205426, 0.1247730522620066, 0.11539957642135833, 0.18017512493896365, 0.3009840918624687, 0.16176800356425394, 0.03751033527733425, 0.10433024727694677, -0.09716125100693783, 0.03216308969171681, -0.18044630975912737, -0.18633013846127575, -0.19668829281018763, 0.06608342670919204, -0.015891766411927685, -0.2370382134456863, 0.43904051520177073, 0.11973789840048513, 0.15610630065202713, -0.01951953212326602, 0.25022423984822106, 0.18859131767920262, 0.14028324751146384, 0.03597644036820787, 0.318728998681185, 0.20070938186701512, 0.0706133657838187, -0.28393556300353334, -0.02979235118563404, -0.005282995889321069] |
1,802.06798 | Classification of Tidal Disruption Events Based on Stellar Orbital
Properties | We study the rates of tidal disruption of stars by intermediate-mass to
supermassive black holes on bound to unbound orbits by using high-accuracy
direct N-body experiments. The approaching stars from the star cluster to the
black hole can take three types of orbit: eccentric, parabolic, and hyperbolic
orbits. Since the mass fallback rate shows a different variability depending on
these orbital types, we can classify tidal disruption events (TDEs) into three
main categories: eccentric, parabolic, and hyperbolic TDEs. Respective TDEs are
characterized by two critical values of the orbital eccentricity: the lower
critical eccentricity is the one below which the stars on eccentric orbits
cause the finite, intense accretion, and the higher critical eccentricity above
which the stars on hyperbolic orbits cause no accretion. Moreover, we find that
the parabolic TDEs are divided into three subclasses: precisely parabolic,
marginally eccentric, and marginally hyperbolic TDEs. We analytically derive
that the mass fallback rate of the marginally eccentric TDEs can be flatter and
slightly higher than the standard fallback rate proportional to $t^{-5/3}$,
whereas it can be flatter and lower for the marginally hyperbolic TDEs. We
confirm by N-body experiments that only few eccentric, precisely parabolic, and
hyperbolic TDEs can occur in a spherical stellar system with a single
intermediate-mass to supermassive black hole. A substantial fraction of the
stars approaching to the black hole would cause the marginally eccentric or
marginally hyperbolic TDEs.
| astro-ph.HE astro-ph.GA gr-qc | we study the rates of tidal disruption of stars by intermediatemass to supermassive black holes on bound to unbound orbits by using highaccuracy direct nbody experiments the approaching stars from the star cluster to the black hole can take three types of orbit eccentric parabolic and hyperbolic orbits since the mass fallback rate shows a different variability depending on these orbital types we can classify tidal disruption events tdes into three main categories eccentric parabolic and hyperbolic tdes respective tdes are characterized by two critical values of the orbital eccentricity the lower critical eccentricity is the one below which the stars on eccentric orbits cause the finite intense accretion and the higher critical eccentricity above which the stars on hyperbolic orbits cause no accretion moreover we find that the parabolic tdes are divided into three subclasses precisely parabolic marginally eccentric and marginally hyperbolic tdes we analytically derive that the mass fallback rate of the marginally eccentric tdes can be flatter and slightly higher than the standard fallback rate proportional to t53 whereas it can be flatter and lower for the marginally hyperbolic tdes we confirm by nbody experiments that only few eccentric precisely parabolic and hyperbolic tdes can occur in a spherical stellar system with a single intermediatemass to supermassive black hole a substantial fraction of the stars approaching to the black hole would cause the marginally eccentric or marginally hyperbolic tdes | [['we', 'study', 'the', 'rates', 'of', 'tidal', 'disruption', 'of', 'stars', 'by', 'intermediatemass', 'to', 'supermassive', 'black', 'holes', 'on', 'bound', 'to', 'unbound', 'orbits', 'by', 'using', 'highaccuracy', 'direct', 'nbody', 'experiments', 'the', 'approaching', 'stars', 'from', 'the', 'star', 'cluster', 'to', 'the', 'black', 'hole', 'can', 'take', 'three', 'types', 'of', 'orbit', 'eccentric', 'parabolic', 'and', 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1,802.06799 | Stellar Populations of over one thousand $z\sim0.8$ Galaxies from
LEGA-C: Ages and Star Formation Histories from D$_n$4000 and H$\delta$ | Drawing from the LEGA-C dataset, we present the spectroscopic view of the
stellar population across a large volume- and mass-selected sample of galaxies
at large lookback time. We measure the 4000\AA\ break (D$_n$4000) and Balmer
absorption line strengths (probed by H$\delta$) from 1019 high-quality spectra
of $z=0.6 - 1.0$ galaxies with $M_\ast = 2 \times 10^{10} M_\odot - 3 \times
10^{11} M_\odot$. Our analysis serves as a first illustration of the power of
high-resolution, high-S/N continuum spectroscopy at intermediate redshifts as a
qualitatively new tool to constrain galaxy formation models. The observed
D$_n$4000-EW(H$\delta$) distribution of our sample overlaps with the
distribution traced by present-day galaxies, but $z\sim 0.8$ galaxies populate
that locus in a fundamentally different manner. While old galaxies dominate the
present-day population at all stellar masses $> 2\times10^{10} M_\odot$, we see
a bimodal D$_n$4000-EW(H$\delta$) distribution at $z\sim0.8$, implying a
bimodal light-weighted age distribution. The light-weighted age depends
strongly on stellar mass, with the most massive galaxies
$>1\times10^{11}M_\odot$ being almost all older than 2 Gyr. At the same time we
estimate that galaxies in this high mass range are only $\sim3$ Gyr younger
than their $z\sim0.1$ counterparts, at odd with pure passive evolution given a
difference in lookback time of $>5$ Gyr; younger galaxies must grow to
$>10^{11}M_\odot$ in the meantime, and/or small amounts of young stars must
keep the light-weighted ages young. Star-forming galaxies at $z\sim0.8$ have
stronger H$\delta$ absorption than present-day galaxies with the same
D$_n$4000, implying larger short-term variations in star-formation activity.
| astro-ph.GA | drawing from the legac dataset we present the spectroscopic view of the stellar population across a large volume and massselected sample of galaxies at large lookback time we measure the 4000aa break d_n4000 and balmer absorption line strengths probed by hdelta from 1019 highquality spectra of z06 10 galaxies with m_ast 2 times 1010 m_odot 3 times 1011 m_odot our analysis serves as a first illustration of the power of highresolution highsn continuum spectroscopy at intermediate redshifts as a qualitatively new tool to constrain galaxy formation models the observed d_n4000ewhdelta distribution of our sample overlaps with the distribution traced by presentday galaxies but zsim 08 galaxies populate that locus in a fundamentally different manner while old galaxies dominate the presentday population at all stellar masses 2times1010 m_odot we see a bimodal d_n4000ewhdelta distribution at zsim08 implying a bimodal lightweighted age distribution the lightweighted age depends strongly on stellar mass with the most massive galaxies 1times1011m_odot being almost all older than 2 gyr at the same time we estimate that galaxies in this high mass range are only sim3 gyr younger than their zsim01 counterparts at odd with pure passive evolution given a difference in lookback time of 5 gyr younger galaxies must grow to 1011m_odot in the meantime andor small amounts of young stars must keep the lightweighted ages young starforming galaxies at zsim08 have stronger hdelta absorption than presentday galaxies with the same d_n4000 implying larger shortterm variations in starformation activity | [['drawing', 'from', 'the', 'legac', 'dataset', 'we', 'present', 'the', 'spectroscopic', 'view', 'of', 'the', 'stellar', 'population', 'across', 'a', 'large', 'volume', 'and', 'massselected', 'sample', 'of', 'galaxies', 'at', 'large', 'lookback', 'time', 'we', 'measure', 'the', '4000aa', 'break', 'd_n4000', 'and', 'balmer', 'absorption', 'line', 'strengths', 'probed', 'by', 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1,802.068 | Testing the accuracy of reflection-based supermassive black hole spin
measurements in AGN | X-ray reflection is a very powerful method to assess the spin of supermassive
black holes (SMBHs) in active galactic nuclei (AGN), yet this technique is not
universally accepted. Indeed, complex reprocessing (absorption, scattering) of
the intrinsic spectra along the line of sight can mimic the relativistic
effects on which the spin measure is based. In this work, we test the
reliability of SMBH spin measurements that can currently be achieved through
the simulations of high-quality XMM-Newton and NuSTAR spectra. Each member of
our group simulated ten spectra with multiple components that are typically
seen in AGN, such as warm and (partial-covering) neutral absorbers,
relativistic and distant reflection, and thermal emission. The resulting
spectra were blindly analysed by the other two members. Out of the 60 fits, 42
turn out to be physically accurate when compared to the input model. The SMBH
spin is retrieved with success in 31 cases, some of which (9) are even found
among formally inaccurate fits (although with looser constraints). We show
that, at the high signal-to-noise ratio assumed in our simulations, neither the
complexity of the multi-layer, partial-covering absorber nor the input value of
the spin are the major drivers of our results. The height of the X-ray source
(in a lamp-post geometry) instead plays a crucial role in recovering the spin.
In particular, a success rate of 16 out of 16 is found among the accurate fits
for a dimensionless spin parameter larger than 0.8 and a lamp-post height lower
than five gravitational radii.
| astro-ph.HE | xray reflection is a very powerful method to assess the spin of supermassive black holes smbhs in active galactic nuclei agn yet this technique is not universally accepted indeed complex reprocessing absorption scattering of the intrinsic spectra along the line of sight can mimic the relativistic effects on which the spin measure is based in this work we test the reliability of smbh spin measurements that can currently be achieved through the simulations of highquality xmmnewton and nustar spectra each member of our group simulated ten spectra with multiple components that are typically seen in agn such as warm and partialcovering neutral absorbers relativistic and distant reflection and thermal emission the resulting spectra were blindly analysed by the other two members out of the 60 fits 42 turn out to be physically accurate when compared to the input model the smbh spin is retrieved with success in 31 cases some of which 9 are even found among formally inaccurate fits although with looser constraints we show that at the high signaltonoise ratio assumed in our simulations neither the complexity of the multilayer partialcovering absorber nor the input value of the spin are the major drivers of our results the height of the xray source in a lamppost geometry instead plays a crucial role in recovering the spin in particular a success rate of 16 out of 16 is found among the accurate fits for a dimensionless spin parameter larger than 08 and a lamppost height lower than five gravitational radii | [['xray', 'reflection', 'is', 'a', 'very', 'powerful', 'method', 'to', 'assess', 'the', 'spin', 'of', 'supermassive', 'black', 'holes', 'smbhs', 'in', 'active', 'galactic', 'nuclei', 'agn', 'yet', 'this', 'technique', 'is', 'not', 'universally', 'accepted', 'indeed', 'complex', 'reprocessing', 'absorption', 'scattering', 'of', 'the', 'intrinsic', 'spectra', 'along', 'the', 'line', 'of', 'sight', 'can', 'mimic', 'the', 'relativistic', 'effects', 'on', 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1,802.06801 | Globular Clusters in High-Redshift Dwarf Galaxies: A Case Study from the
Local Group | We present the reconstructed evolution of rest-frame ultra-violet (UV)
luminosities of the most massive Milky Way dwarf spheroidal satellite galaxy,
Fornax, and its five globular clusters (GCs) across redshift, based on analysis
of the stellar fossil record and stellar population synthesis modeling. We find
that (1) Fornax's (proto-)GCs can generate $10-100$ times more UV flux than the
field population, despite comprising $<\sim 5\%$ of the stellar mass at the
relevant redshifts; (2) due to their respective surface brightnesses, it is
more likely that faint, compact sources in the Hubble Frontier Fields (HFFs)
are GCs hosted by faint galaxies, than faint galaxies themselves. This may
significantly complicate the construction of a galaxy UV luminosity function at
$z>3$. (3) GC formation can introduce order-of-magnitude errors in abundance
matching. We also find that some compact HFF objects are consistent with the
reconstructed properties of Fornax's GCs at the same redshifts (e.g., surface
brightness, star formation rate), suggesting we may already have detected
proto-GCs in the early Universe. Finally, we discuss the prospects for
improving the connections between local GCs and proto-GCs detected in the early
Universe.
| astro-ph.GA | we present the reconstructed evolution of restframe ultraviolet uv luminosities of the most massive milky way dwarf spheroidal satellite galaxy fornax and its five globular clusters gcs across redshift based on analysis of the stellar fossil record and stellar population synthesis modeling we find that 1 fornaxs protogcs can generate 10100 times more uv flux than the field population despite comprising sim 5 of the stellar mass at the relevant redshifts 2 due to their respective surface brightnesses it is more likely that faint compact sources in the hubble frontier fields hffs are gcs hosted by faint galaxies than faint galaxies themselves this may significantly complicate the construction of a galaxy uv luminosity function at z3 3 gc formation can introduce orderofmagnitude errors in abundance matching we also find that some compact hff objects are consistent with the reconstructed properties of fornaxs gcs at the same redshifts eg surface brightness star formation rate suggesting we may already have detected protogcs in the early universe finally we discuss the prospects for improving the connections between local gcs and protogcs detected in the early universe | [['we', 'present', 'the', 'reconstructed', 'evolution', 'of', 'restframe', 'ultraviolet', 'uv', 'luminosities', 'of', 'the', 'most', 'massive', 'milky', 'way', 'dwarf', 'spheroidal', 'satellite', 'galaxy', 'fornax', 'and', 'its', 'five', 'globular', 'clusters', 'gcs', 'across', 'redshift', 'based', 'on', 'analysis', 'of', 'the', 'stellar', 'fossil', 'record', 'and', 'stellar', 'population', 'synthesis', 'modeling', 'we', 'find', 'that', '1', 'fornaxs', 'protogcs', 'can', 'generate', '10100', 'times', 'more', 'uv', 'flux', 'than', 'the', 'field', 'population', 'despite', 'comprising', 'sim', '5', 'of', 'the', 'stellar', 'mass', 'at', 'the', 'relevant', 'redshifts', '2', 'due', 'to', 'their', 'respective', 'surface', 'brightnesses', 'it', 'is', 'more', 'likely', 'that', 'faint', 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1,802.06802 | The Cosmic Web Around The Brightest Galaxies During The Epoch Of
Reionization | The most luminous galaxies at high-redshift are generally considered to be
hosted in massive dark-matter halos of comparable number density, hence
residing at the center of overdensities/protoclusters. We assess the validity
of this assumption by investigating the clustering around the brightest
galaxies populating the cosmic web at redshift $z\sim8-9$ through a combination
of semi-analytic modeling and Monte Carlo simulations of mock Hubble Space
Telescope WFC3 observations. The innovative aspect of our approach is the
inclusion of a log-normal scatter parameter $\Sigma$ in the galaxy luminosity
versus halo mass relation, extending to high-$z$ the conditional luminosity
function framework extensively used at low redshift. Our analysis shows that
the larger the value of $\Sigma$, the less likely that the brightest source in
a given volume is hosted in the most massive halo, and hence the weaker the
overdensity of neighbors. We derive a minimum value of $\Sigma$ as a function
of redshift by considering stochasticity in the halo assembly times, which
affects galaxy ages and star formation rates in our modeling. We show that
$\Sigma_{min}(z)\sim0.15-0.3$, with $\Sigma_{min}$ increasing with redshift as
a consequence of shorter halo assembly periods at higher redshifts. Current
observations ($m_{AB}\sim27$) of the environment of spectroscopically confirmed
bright sources at $z>7.5$ do not show strong evidence of clustering and are
consistent with our modeling predictions for $\Sigma\geq\Sigma_{min}$. Deeper
future observations reaching $m_{AB}\sim28.2-29$ would have the opportunity to
clearly quantify the clustering strength, and hence to constrain $\Sigma$,
investigating the physical processes that drive star formation in the early
Universe.
| astro-ph.GA | the most luminous galaxies at highredshift are generally considered to be hosted in massive darkmatter halos of comparable number density hence residing at the center of overdensitiesprotoclusters we assess the validity of this assumption by investigating the clustering around the brightest galaxies populating the cosmic web at redshift zsim89 through a combination of semianalytic modeling and monte carlo simulations of mock hubble space telescope wfc3 observations the innovative aspect of our approach is the inclusion of a lognormal scatter parameter sigma in the galaxy luminosity versus halo mass relation extending to highz the conditional luminosity function framework extensively used at low redshift our analysis shows that the larger the value of sigma the less likely that the brightest source in a given volume is hosted in the most massive halo and hence the weaker the overdensity of neighbors we derive a minimum value of sigma as a function of redshift by considering stochasticity in the halo assembly times which affects galaxy ages and star formation rates in our modeling we show that sigma_minzsim01503 with sigma_min increasing with redshift as a consequence of shorter halo assembly periods at higher redshifts current observations m_absim27 of the environment of spectroscopically confirmed bright sources at z75 do not show strong evidence of clustering and are consistent with our modeling predictions for sigmageqsigma_min deeper future observations reaching m_absim28229 would have the opportunity to clearly quantify the clustering strength and hence to constrain sigma investigating the physical processes that drive star formation in the early universe | [['the', 'most', 'luminous', 'galaxies', 'at', 'highredshift', 'are', 'generally', 'considered', 'to', 'be', 'hosted', 'in', 'massive', 'darkmatter', 'halos', 'of', 'comparable', 'number', 'density', 'hence', 'residing', 'at', 'the', 'center', 'of', 'overdensitiesprotoclusters', 'we', 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1,802.06803 | Lepton flavour violation in the MSSM: exact diagonalization vs mass
expansion | The forthcoming precision data on lepton flavour violating decays require
precise and efficient calculations in New Physics models. In this article
lepton flavour violating processes within the Minimal Supersymmetric Standard
Model (MSSM) are calculated using the method based on the Flavour Expansion
Theorem, a recently developed technique performing a purely algebraic
mass-insertion expansion of the amplitudes. The expansion in both
flavour-violating and flavour-conserving off-diagonal terms of sfermion and
supersymmetric fermion mass matrices is considered. In this way the relevant
processes are expressed directly in terms of the parameters of the MSSM
Lagrangian. We also study the decoupling properties of the amplitudes. The
results are compared to the corresponding calculations in the mass eigenbasis
(i.e. using the exact diagonalization of the mass matrices). Using these
methods, we consider the following processes: $\ell \to \ell' \gamma$, $\ell
\to 3 \ell'$, $\ell \to 2\ell'\ell"$, $h \to \ell\ell'$ as well as $\mu \to e$
conversion in nuclei. In the numerical analysis we update the bounds on the
flavour changing parameters of the MSSM and examine the sensitivity to the
forthcoming experimental results. We find that flavour violating muon decays
provide the most stringent bounds on supersymmetric effects and will continue
to do so in the future. Radiative $\ell\to\ell^\prime\gamma$ decays and
leptonic three-body decays $\ell\to 3\ell^\prime$ show an interesting
complementarity in eliminating "blind spots" in the parameter space. In our
analysis we also include the effects of non-holomorphic $A$-terms which are
important for the study of LFV Higgs decays.
| hep-ph | the forthcoming precision data on lepton flavour violating decays require precise and efficient calculations in new physics models in this article lepton flavour violating processes within the minimal supersymmetric standard model mssm are calculated using the method based on the flavour expansion theorem a recently developed technique performing a purely algebraic massinsertion expansion of the amplitudes the expansion in both flavourviolating and flavourconserving offdiagonal terms of sfermion and supersymmetric fermion mass matrices is considered in this way the relevant processes are expressed directly in terms of the parameters of the mssm lagrangian we also study the decoupling properties of the amplitudes the results are compared to the corresponding calculations in the mass eigenbasis ie using the exact diagonalization of the mass matrices using these methods we consider the following processes ell to ell gamma ell to 3 ell ell to 2ellell h to ellell as well as mu to e conversion in nuclei in the numerical analysis we update the bounds on the flavour changing parameters of the mssm and examine the sensitivity to the forthcoming experimental results we find that flavour violating muon decays provide the most stringent bounds on supersymmetric effects and will continue to do so in the future radiative elltoellprimegamma decays and leptonic threebody decays ellto 3ellprime show an interesting complementarity in eliminating blind spots in the parameter space in our analysis we also include the effects of nonholomorphic aterms which are important for the study of lfv higgs decays | [['the', 'forthcoming', 'precision', 'data', 'on', 'lepton', 'flavour', 'violating', 'decays', 'require', 'precise', 'and', 'efficient', 'calculations', 'in', 'new', 'physics', 'models', 'in', 'this', 'article', 'lepton', 'flavour', 'violating', 'processes', 'within', 'the', 'minimal', 'supersymmetric', 'standard', 'model', 'mssm', 'are', 'calculated', 'using', 'the', 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1,802.06804 | Azimuthal Anisotropies at High Momentum from Purely Non-Hydrodynamic
Transport | In the limit of short mean free path, relativistic kinetic theory gives rise
to hydrodynamics through a systematically improvable gradient expansion. In the
present work, a systematically improvable expansion in the opposite limit of
large mean free path is considered, describing the dynamics of particles which
are almost, but not quite, non-interacting. This non-hydrodynamic "eremitic"
expansion does not break down for large gradients, and may be useful in
situations where a hydrodynamic treatment is not applicable. As applications,
azimuthal anisotropies at high transverse momentum in Pb+Pb and p+Pb collisions
at $\sqrt{s}=5.02$ TeV are calculated from the first order eremitic expansion
of kinetic theory in the relaxation time approximation.
| nucl-th astro-ph.HE hep-ph | in the limit of short mean free path relativistic kinetic theory gives rise to hydrodynamics through a systematically improvable gradient expansion in the present work a systematically improvable expansion in the opposite limit of large mean free path is considered describing the dynamics of particles which are almost but not quite noninteracting this nonhydrodynamic eremitic expansion does not break down for large gradients and may be useful in situations where a hydrodynamic treatment is not applicable as applications azimuthal anisotropies at high transverse momentum in pbpb and ppb collisions at sqrts502 tev are calculated from the first order eremitic expansion of kinetic theory in the relaxation time approximation | [['in', 'the', 'limit', 'of', 'short', 'mean', 'free', 'path', 'relativistic', 'kinetic', 'theory', 'gives', 'rise', 'to', 'hydrodynamics', 'through', 'a', 'systematically', 'improvable', 'gradient', 'expansion', 'in', 'the', 'present', 'work', 'a', 'systematically', 'improvable', 'expansion', 'in', 'the', 'opposite', 'limit', 'of', 'large', 'mean', 'free', 'path', 'is', 'considered', 'describing', 'the', 'dynamics', 'of', 'particles', 'which', 'are', 'almost', 'but', 'not', 'quite', 'noninteracting', 'this', 'nonhydrodynamic', 'eremitic', 'expansion', 'does', 'not', 'break', 'down', 'for', 'large', 'gradients', 'and', 'may', 'be', 'useful', 'in', 'situations', 'where', 'a', 'hydrodynamic', 'treatment', 'is', 'not', 'applicable', 'as', 'applications', 'azimuthal', 'anisotropies', 'at', 'high', 'transverse', 'momentum', 'in', 'pbpb', 'and', 'ppb', 'collisions', 'at', 'sqrts502', 'tev', 'are', 'calculated', 'from', 'the', 'first', 'order', 'eremitic', 'expansion', 'of', 'kinetic', 'theory', 'in', 'the', 'relaxation', 'time', 'approximation']] | [-0.10108318251671868, 0.23124564005905446, -0.1704763757978689, 0.12180261982644398, -0.022055029996477488, -0.07388123896693424, -0.07307781156521502, 0.34531227605557946, -0.2450287034954735, -0.28560958416113313, -0.0026154508616529266, -0.26913187877749495, 1.8751196000935897e-05, 0.15904843204496605, 0.03423094160784528, 0.008783033130831033, 0.06176333533564828, 0.01712396397378366, -0.0775502606933137, -0.19848797541498295, 0.204411069080585, 0.0946017629906254, 0.24102443508487545, 0.1036243820453133, 0.07051468822437357, 0.02311119124433904, -0.006037265444525851, 0.0806747580228268, -0.1626788077629962, 0.05440521595877692, 0.2747704525882343, -0.025107177839842888, 0.24737418179382692, -0.42336672477265996, -0.20508505861749346, 0.07114844678303683, 0.2322721414285589, 0.17563029678147463, -0.01714627083636961, -0.17120649025968784, 0.04853761748340473, -0.21722357774610226, -0.16782083634269546, -0.09564963430341966, 0.014992342692940443, 0.023436663648166326, -0.2663760363730549, 0.18697526103395196, 0.030861665599623625, 0.06545691088337302, -0.02705061785110167, -0.09687188730733294, -0.0063931218629597495, 0.06805680983893152, 0.07855175737563942, 0.06348140876002188, 0.12469553619289314, -0.149968604143173, -0.07232970135058013, 0.4355842621188681, -0.07760564609263795, -0.18885487627308323, 0.19112117607410084, -0.2184996109736978, -0.13920184028475494, 0.18646571414439744, 0.20557328052203752, 0.15594961343965721, -0.2008493989091015, 0.09968804265701932, 0.03677448500299229, 0.12839717094189013, 0.0772112746687852, 0.03341483862033852, 0.19520465147921504, 0.11450545930848369, 0.04141512908533497, 0.08364759644664789, -0.04001814923315081, -0.1336856157483779, -0.38887337897464913, -0.09124382087117378, -0.1941404004212258, 0.08384889254238312, -0.09606044750879211, -0.15428087241807073, 0.3418278882965305, 0.15814665582949156, 0.20990627819566793, 0.04227687011776, 0.28058152524578683, 0.15683469305886835, 0.06187659866650993, 0.11800500095760415, 0.273208221315213, 0.14192014516173107, 0.15847542132953849, -0.22708004336356064, 0.03392590643433889, 0.10183507124981228] |
1,802.06805 | exocartographer: A Bayesian Framework for Mapping Exoplanets in
Reflected Light | Future space telescopes will directly image extrasolar planets at visible
wavelengths. Time-resolved reflected light from an exoplanet encodes
information about atmospheric and surface inhomogeneities. Previous research
has shown that the light curve of an exoplanet can be inverted to obtain a
low-resolution map of the planet, as well as constraints on its spin
orientation. Estimating the uncertainty on 2D albedo maps has so far remained
elusive. Here we present exocartographer, a flexible open-source Bayesian
framework for solving the exo-cartography inverse problem. The map is
parameterized with equal-area HEALPix pixels. For a fiducial map resolution of
192 pixels, a four-parameter Gaussian process describing the spatial scale of
albedo variations, and two unknown planetary spin parameters, exocartographer
explores a 198-dimensional parameter space. To test the code, we produce a
light curve for a cloudless Earth in a face-on orbit with a 90$^\circ$
obliquity. We produce synthetic white light observations of the planet: 5
epochs of observations throughout the planet's orbit, each consisting of 24
hourly observations with a photometric uncertainty of $1\%$ (120 data). We
retrieve an albedo map and$-$for the first time$-$its uncertainties, along with
spin constraints. The albedo map is recognizably of Earth, with typical
uncertainty of $30\%$. The retrieved characteristic length scale is 88$\pm 7
^\circ$, or 9800 km. The obliquity is recovered with a $1-\sigma$ uncertainty
of $0.8^\circ$. Despite the uncertainty in the retrieved albedo map, we
robustly identify a high albedo region (the Sahara desert) and a large
low-albedo region (the Pacific Ocean).
| astro-ph.EP astro-ph.IM | future space telescopes will directly image extrasolar planets at visible wavelengths timeresolved reflected light from an exoplanet encodes information about atmospheric and surface inhomogeneities previous research has shown that the light curve of an exoplanet can be inverted to obtain a lowresolution map of the planet as well as constraints on its spin orientation estimating the uncertainty on 2d albedo maps has so far remained elusive here we present exocartographer a flexible opensource bayesian framework for solving the exocartography inverse problem the map is parameterized with equalarea healpix pixels for a fiducial map resolution of 192 pixels a fourparameter gaussian process describing the spatial scale of albedo variations and two unknown planetary spin parameters exocartographer explores a 198dimensional parameter space to test the code we produce a light curve for a cloudless earth in a faceon orbit with a 90circ obliquity we produce synthetic white light observations of the planet 5 epochs of observations throughout the planets orbit each consisting of 24 hourly observations with a photometric uncertainty of 1 120 data we retrieve an albedo map andfor the first timeits uncertainties along with spin constraints the albedo map is recognizably of earth with typical uncertainty of 30 the retrieved characteristic length scale is 88pm 7 circ or 9800 km the obliquity is recovered with a 1sigma uncertainty of 08circ despite the uncertainty in the retrieved albedo map we robustly identify a high albedo region the sahara desert and a large lowalbedo region the pacific ocean | [['future', 'space', 'telescopes', 'will', 'directly', 'image', 'extrasolar', 'planets', 'at', 'visible', 'wavelengths', 'timeresolved', 'reflected', 'light', 'from', 'an', 'exoplanet', 'encodes', 'information', 'about', 'atmospheric', 'and', 'surface', 'inhomogeneities', 'previous', 'research', 'has', 'shown', 'that', 'the', 'light', 'curve', 'of', 'an', 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1,802.06806 | Divide, Denoise, and Defend against Adversarial Attacks | Deep neural networks, although shown to be a successful class of machine
learning algorithms, are known to be extremely unstable to adversarial
perturbations. Improving the robustness of neural networks against these
attacks is important, especially for security-critical applications. To defend
against such attacks, we propose dividing the input image into multiple
patches, denoising each patch independently, and reconstructing the image,
without losing significant image content. We call our method D3. This proposed
defense mechanism is non-differentiable which makes it non-trivial for an
adversary to apply gradient-based attacks. Moreover, we do not fine-tune the
network with adversarial examples, making it more robust against unknown
attacks. We present an analysis of the tradeoff between accuracy and robustness
against adversarial attacks. We evaluate our method under black-box, grey-box,
and white-box settings. On the ImageNet dataset, our method outperforms the
state-of-the-art by 19.7% under grey-box setting, and performs comparably under
black-box setting. For the white-box setting, the proposed method achieves
34.4% accuracy compared to the 0% reported in the recent works.
| cs.CV cs.AI | deep neural networks although shown to be a successful class of machine learning algorithms are known to be extremely unstable to adversarial perturbations improving the robustness of neural networks against these attacks is important especially for securitycritical applications to defend against such attacks we propose dividing the input image into multiple patches denoising each patch independently and reconstructing the image without losing significant image content we call our method d3 this proposed defense mechanism is nondifferentiable which makes it nontrivial for an adversary to apply gradientbased attacks moreover we do not finetune the network with adversarial examples making it more robust against unknown attacks we present an analysis of the tradeoff between accuracy and robustness against adversarial attacks we evaluate our method under blackbox greybox and whitebox settings on the imagenet dataset our method outperforms the stateoftheart by 197 under greybox setting and performs comparably under blackbox setting for the whitebox setting the proposed method achieves 344 accuracy compared to the 0 reported in the recent works | [['deep', 'neural', 'networks', 'although', 'shown', 'to', 'be', 'a', 'successful', 'class', 'of', 'machine', 'learning', 'algorithms', 'are', 'known', 'to', 'be', 'extremely', 'unstable', 'to', 'adversarial', 'perturbations', 'improving', 'the', 'robustness', 'of', 'neural', 'networks', 'against', 'these', 'attacks', 'is', 'important', 'especially', 'for', 'securitycritical', 'applications', 'to', 'defend', 'against', 'such', 'attacks', 'we', 'propose', 'dividing', 'the', 'input', 'image', 'into', 'multiple', 'patches', 'denoising', 'each', 'patch', 'independently', 'and', 'reconstructing', 'the', 'image', 'without', 'losing', 'significant', 'image', 'content', 'we', 'call', 'our', 'method', 'd3', 'this', 'proposed', 'defense', 'mechanism', 'is', 'nondifferentiable', 'which', 'makes', 'it', 'nontrivial', 'for', 'an', 'adversary', 'to', 'apply', 'gradientbased', 'attacks', 'moreover', 'we', 'do', 'not', 'finetune', 'the', 'network', 'with', 'adversarial', 'examples', 'making', 'it', 'more', 'robust', 'against', 'unknown', 'attacks', 'we', 'present', 'an', 'analysis', 'of', 'the', 'tradeoff', 'between', 'accuracy', 'and', 'robustness', 'against', 'adversarial', 'attacks', 'we', 'evaluate', 'our', 'method', 'under', 'blackbox', 'greybox', 'and', 'whitebox', 'settings', 'on', 'the', 'imagenet', 'dataset', 'our', 'method', 'outperforms', 'the', 'stateoftheart', 'by', '197', 'under', 'greybox', 'setting', 'and', 'performs', 'comparably', 'under', 'blackbox', 'setting', 'for', 'the', 'whitebox', 'setting', 'the', 'proposed', 'method', 'achieves', '344', 'accuracy', 'compared', 'to', 'the', '0', 'reported', 'in', 'the', 'recent', 'works']] | [-0.06461240585006685, -0.07872843407955395, -0.051971316433784935, 0.10217176179588398, -0.08493463351658942, -0.26689679156933094, 0.04991416125502549, 0.44501545015599825, -0.20680737266216628, -0.32908929401763276, 0.08694950233891183, -0.26977497108369886, -0.23536807613190777, 0.2356953423415885, -0.19801510144080856, 0.15260760566152767, 0.07593636083121072, -0.004701278589297822, -0.026595228655587236, -0.3721975346673057, 0.3137020399713119, 0.06897130267381596, 0.35404498052565814, -0.006109442012203288, 0.09958624754736792, -0.03915873458985418, 0.006419850833306903, -0.015399555748880668, -0.02958284199661659, 0.09311765506668407, 0.30941865913049543, 0.20593958660056758, 0.340660551788765, -0.40240772719868645, -0.2328310164784689, 0.13714929755629335, 0.11864363566922125, 0.17682911014716937, -0.06738649650041535, -0.39094574729393344, 0.1765597917872877, -0.18431085688312968, -0.007477863468850187, -0.21974447586512316, -0.03274212299684386, -0.05053653068837715, -0.3152578447654029, 0.007912548900230559, 0.09984133700968441, 0.02386135203083475, -0.04481631730164507, -0.09956013164510895, 0.027265819064257835, 0.12633529579556899, 0.061006613767254136, 0.0501737043311719, 0.1935758057279055, -0.1655388975394928, -0.1506941268571881, 0.32998625607882254, -0.0576749965632167, -0.2158498817226643, 0.21497094573754216, 0.05811996101875773, -0.16397693183574225, 0.10174285625748916, 0.22847581168212844, 0.15803753415368008, -0.09724243844351815, 0.009751314599858877, -0.019236581466958193, 0.18930471554108544, 0.045839808417015716, -0.0005394986211628971, 0.08027570668474107, 0.2450034330769102, 0.09942016318512935, 0.17788554845840676, -0.15344729798589415, -0.07680343360149351, -0.2000849865754079, -0.05161820482992439, -0.18494234751898816, -0.012083502906610949, -0.09501634743085555, -0.13254600335634034, 0.39587157335087747, 0.2928356679552374, 0.18222398452968253, 0.1383979730315027, 0.4160550409805275, -0.020876693704533586, 0.08212196237190131, 0.15605332041549647, 0.22891337554595115, 0.01622110677319774, 0.07779623816817341, -0.15900253719499635, 0.16358282429676413, 0.011850400758812394] |
1,802.06807 | On the Complexity of Opinions and Online Discussions | In an increasingly polarized world, demagogues who reduce complexity down to
simple arguments based on emotion are gaining in popularity. Are opinions and
online discussions falling into demagoguery? In this work, we aim to provide
computational tools to investigate this question and, by doing so, explore the
nature and complexity of online discussions and their space of opinions,
uncovering where each participant lies.
More specifically, we present a modeling framework to construct latent
representations of opinions in online discussions which are consistent with
human judgements, as measured by online voting. If two opinions are close in
the resulting latent space of opinions, it is because humans think they are
similar. Our modeling framework is theoretically grounded and establishes a
surprising connection between opinions and voting models and the sign-rank of a
matrix. Moreover, it also provides a set of practical algorithms to both
estimate the dimension of the latent space of opinions and infer where opinions
expressed by the participants of an online discussion lie in this space.
Experiments on a large dataset from Yahoo! News, Yahoo! Finance, Yahoo! Sports,
and the Newsroom app suggest that unidimensional opinion models may often be
unable to accurately represent online discussions, provide insights into human
judgements and opinions, and show that our framework is able to circumvent
language nuances such as sarcasm or humor by relying on human judgements
instead of textual analysis.
| cs.SI cs.CY stat.ML | in an increasingly polarized world demagogues who reduce complexity down to simple arguments based on emotion are gaining in popularity are opinions and online discussions falling into demagoguery in this work we aim to provide computational tools to investigate this question and by doing so explore the nature and complexity of online discussions and their space of opinions uncovering where each participant lies more specifically we present a modeling framework to construct latent representations of opinions in online discussions which are consistent with human judgements as measured by online voting if two opinions are close in the resulting latent space of opinions it is because humans think they are similar our modeling framework is theoretically grounded and establishes a surprising connection between opinions and voting models and the signrank of a matrix moreover it also provides a set of practical algorithms to both estimate the dimension of the latent space of opinions and infer where opinions expressed by the participants of an online discussion lie in this space experiments on a large dataset from yahoo news yahoo finance yahoo sports and the newsroom app suggest that unidimensional opinion models may often be unable to accurately represent online discussions provide insights into human judgements and opinions and show that our framework is able to circumvent language nuances such as sarcasm or humor by relying on human judgements instead of textual analysis | [['in', 'an', 'increasingly', 'polarized', 'world', 'demagogues', 'who', 'reduce', 'complexity', 'down', 'to', 'simple', 'arguments', 'based', 'on', 'emotion', 'are', 'gaining', 'in', 'popularity', 'are', 'opinions', 'and', 'online', 'discussions', 'falling', 'into', 'demagoguery', 'in', 'this', 'work', 'we', 'aim', 'to', 'provide', 'computational', 'tools', 'to', 'investigate', 'this', 'question', 'and', 'by', 'doing', 'so', 'explore', 'the', 'nature', 'and', 'complexity', 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1,802.06808 | Corrections to Newton's law of gravitation - application to hybrid Bloch
brane | We present in this work, the calculations of corrections in the Newton's law
of gravitation due to Kaluza-Klein gravitons in five-dimensional warped thick
braneworld scenarios. We consider here a recently proposed model, namely, the
hybrid Bloch brane. This model couples two scalar fields to gravity and is
engendered from a domain wall-like defect. Also, two other models the so-called
asymmetric hybrid brane and compact brane are considered. As a matter of fact,
these models are obtained from deformations of the phi4 and sine-Gordon
topological defects. Then, we constructed the branes upon such defects, and the
corresponding corrections in Newton's law of gravitation are computed. In order
to attain the mass spectrum and its corresponding eigenfunctions which are the
essential quantities for computing the correction to the Newtonian potential,
we develop a suitable numerical technique.
| gr-qc hep-th | we present in this work the calculations of corrections in the newtons law of gravitation due to kaluzaklein gravitons in fivedimensional warped thick braneworld scenarios we consider here a recently proposed model namely the hybrid bloch brane this model couples two scalar fields to gravity and is engendered from a domain walllike defect also two other models the socalled asymmetric hybrid brane and compact brane are considered as a matter of fact these models are obtained from deformations of the phi4 and sinegordon topological defects then we constructed the branes upon such defects and the corresponding corrections in newtons law of gravitation are computed in order to attain the mass spectrum and its corresponding eigenfunctions which are the essential quantities for computing the correction to the newtonian potential we develop a suitable numerical technique | [['we', 'present', 'in', 'this', 'work', 'the', 'calculations', 'of', 'corrections', 'in', 'the', 'newtons', 'law', 'of', 'gravitation', 'due', 'to', 'kaluzaklein', 'gravitons', 'in', 'fivedimensional', 'warped', 'thick', 'braneworld', 'scenarios', 'we', 'consider', 'here', 'a', 'recently', 'proposed', 'model', 'namely', 'the', 'hybrid', 'bloch', 'brane', 'this', 'model', 'couples', 'two', 'scalar', 'fields', 'to', 'gravity', 'and', 'is', 'engendered', 'from', 'a', 'domain', 'walllike', 'defect', 'also', 'two', 'other', 'models', 'the', 'socalled', 'asymmetric', 'hybrid', 'brane', 'and', 'compact', 'brane', 'are', 'considered', 'as', 'a', 'matter', 'of', 'fact', 'these', 'models', 'are', 'obtained', 'from', 'deformations', 'of', 'the', 'phi4', 'and', 'sinegordon', 'topological', 'defects', 'then', 'we', 'constructed', 'the', 'branes', 'upon', 'such', 'defects', 'and', 'the', 'corresponding', 'corrections', 'in', 'newtons', 'law', 'of', 'gravitation', 'are', 'computed', 'in', 'order', 'to', 'attain', 'the', 'mass', 'spectrum', 'and', 'its', 'corresponding', 'eigenfunctions', 'which', 'are', 'the', 'essential', 'quantities', 'for', 'computing', 'the', 'correction', 'to', 'the', 'newtonian', 'potential', 'we', 'develop', 'a', 'suitable', 'numerical', 'technique']] | [-0.1234749621197359, 0.12930829227908947, -0.09267936123590638, 0.11002984872468358, -0.08363124813689891, -0.15476820484470966, -0.037048105093122306, 0.3039161228964022, -0.21182017091925798, -0.2712028294023293, 0.0686027665445303, -0.2793494404168494, -0.16048842621619688, 0.14748534358127405, -0.06018451207887326, 0.05922133717625124, -0.04089690848434372, 0.019463284418105024, -0.04508761719647628, -0.21543371911445605, 0.37179509962825524, 0.021326724581957758, 0.2459818992273771, 0.04703720069817031, 0.0696668991325562, -0.0817307680532503, 0.0031251312031952746, 0.040492546948805844, -0.16351343981171054, 0.1355213158550662, 0.17231511522968232, 0.034521751428968205, 0.1643179560552782, -0.4464034558649161, -0.24841846935815914, 0.08439259656440856, 0.16312813667107873, 0.1876345206071178, -0.07096043099916832, -0.2821804002664094, 0.06572593803997082, -0.20749258562755674, -0.15363393544650344, -0.07173815764809972, -0.00296007446013391, -0.03813979211402362, -0.24110162992433493, 0.09038953055126363, 0.03133958378726783, -0.03854194207777445, -0.10327972724092012, -0.07035194260742404, -0.05085461957505279, 0.05146209300676389, 0.11741134871071927, -0.004655066716012114, 0.1405943819815154, -0.12506307590598198, -0.1447933706526172, 0.42596451910699146, -0.10476369949304429, -0.2409199902217891, 0.15892094737196813, -0.1203425341092898, -0.11561776330666755, 0.06484703578527516, 0.15333073500868752, 0.17109521060937463, -0.140032946752426, 0.1838181306961611, 0.03498811789426897, 0.11772527184281777, 0.0809429871446606, 0.03822346538333083, 0.27878435035826943, 0.1140199434933072, -0.007264988573351458, 0.14066246997803075, -0.07142618300963137, -0.14240811790909563, -0.36526564063605116, -0.14342419179364926, -0.16876031165775746, 0.048027915574276624, -0.13954020164150713, -0.19653088553572323, 0.380889754950889, 0.11597086339076954, 0.15239491873966363, 0.033926696176883944, 0.24836741563683348, 0.10593831220228198, 0.07920145706635025, 0.04821570059840581, 0.30154856103263905, 0.13544471572681482, 0.10409001169079887, -0.22974675055810445, -0.12705035761881397, 0.11971563549795702] |
1,802.06809 | Flat holography and Carrollian fluids | We show that a holographic description of four-dimensional asymptotically
locally flat spacetimes is reached smoothly from the zero-cosmological-constant
limit of anti-de Sitter holography. To this end, we use the derivative
expansion of fluid/gravity correspondence. From the boundary perspective, the
vanishing of the bulk cosmological constant appears as the zero velocity of
light limit. This sets how Carrollian geometry emerges in flat holography. The
new boundary data are a two-dimensional spatial surface, identified with the
null infinity of the bulk Ricci-flat spacetime, accompanied with a Carrollian
time and equipped with a Carrollian structure, plus the dynamical observables
of a conformal Carrollian fluid. These are the energy, the viscous stress
tensors and the heat currents, whereas the Carrollian geometry is gathered by a
two-dimensional spatial metric, a frame connection and a scale factor. The
reconstruction of Ricci-flat spacetimes from Carrollian boundary data is
conducted with a flat derivative expansion, resummed in a closed form in
Eddington-Finkelstein gauge under further integrability conditions inherited
from the ancestor anti-de Sitter set-up. These conditions are hinged on a
duality relationship among fluid friction tensors and Cotton-like geometric
data. We illustrate these results in the case of conformal Carrollian perfect
fluids and Robinson-Trautman viscous hydrodynamics. The former are dual to the
asymptotically flat Kerr-Taub-NUT family, while the latter leads to the
homonymous class of algebraically special Ricci-flat spacetimes.
| hep-th gr-qc | we show that a holographic description of fourdimensional asymptotically locally flat spacetimes is reached smoothly from the zerocosmologicalconstant limit of antide sitter holography to this end we use the derivative expansion of fluidgravity correspondence from the boundary perspective the vanishing of the bulk cosmological constant appears as the zero velocity of light limit this sets how carrollian geometry emerges in flat holography the new boundary data are a twodimensional spatial surface identified with the null infinity of the bulk ricciflat spacetime accompanied with a carrollian time and equipped with a carrollian structure plus the dynamical observables of a conformal carrollian fluid these are the energy the viscous stress tensors and the heat currents whereas the carrollian geometry is gathered by a twodimensional spatial metric a frame connection and a scale factor the reconstruction of ricciflat spacetimes from carrollian boundary data is conducted with a flat derivative expansion resummed in a closed form in eddingtonfinkelstein gauge under further integrability conditions inherited from the ancestor antide sitter setup these conditions are hinged on a duality relationship among fluid friction tensors and cottonlike geometric data we illustrate these results in the case of conformal carrollian perfect fluids and robinsontrautman viscous hydrodynamics the former are dual to the asymptotically flat kerrtaubnut family while the latter leads to the homonymous class of algebraically special ricciflat spacetimes | [['we', 'show', 'that', 'a', 'holographic', 'description', 'of', 'fourdimensional', 'asymptotically', 'locally', 'flat', 'spacetimes', 'is', 'reached', 'smoothly', 'from', 'the', 'zerocosmologicalconstant', 'limit', 'of', 'antide', 'sitter', 'holography', 'to', 'this', 'end', 'we', 'use', 'the', 'derivative', 'expansion', 'of', 'fluidgravity', 'correspondence', 'from', 'the', 'boundary', 'perspective', 'the', 'vanishing', 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1,802.0681 | Ships Passing in the Night: Spectroscopic Analysis of Two Ultra-Faint
Satellites in the Constellation Carina | We present Magellan/IMACS, Anglo-Australian Telescope/AAOmega+2dF, and Very
Large Telescope/GIRAFFE+FLAMES spectroscopy of the CarinaII (Car II) & Carina
III (Car III) dwarf galaxy candidates, recently discovered in the Magellanic
Satellites Survey (MagLiteS). We identify 18 member stars in Car II, including
2 binaries with variable radial velocities and 2 RR Lyrae stars. The other 14
members have a mean heliocentric velocity $v_{\rm hel} = 477.2 \pm 1.2$ km/s
and a velocity dispersion of $\sigma_v = 3.4^{+1.2}_{-0.8}$ km/s. Assuming Car
II is in dynamical equilibrium, we derive a total mass within the half-light
radius of $1.0^{+0.8}_{-0.4} \times 10^{6} M_\odot$, indicating a mass-to-light
ratio of $369^{+309}_{-161} M_\odot/L_\odot$. From equivalent width
measurements of the calcium triplet lines of 9 RGB stars, we derive a mean
metallicity of [Fe/H] = $-2.44 \pm 0.09$ with dispersion $\sigma_{\rm [Fe/H]} =
0.22 ^{+0.10}_{-0.07}$. Considering both the kinematic and chemical properties,
we conclude that Car II is a dark-matter-dominated dwarf galaxy. For Car III,
we identify 4 member stars, from which we calculate a systemic velocity of
$v_{\rm hel} = 284.6^{+3.4}_{-3.1}$ km/s. The brightest RGB member of Car III
has a metallicity of [Fe/H] $= -1.97 \pm 0.12$. Due to the small size of the
Car III spectroscopic sample, we cannot conclusively determine its nature.
Although these two systems have the smallest known physical separation ($\Delta
d\sim10~kpc$) among Local Group satellites, the large difference in their
systemic velocities, $\sim200$ km/s, indicates that they are unlikely to be a
bound pair. One or both systems are likely associated with the Large Magellanic
Cloud (LMC), and may remain LMC satellites today. No statistically significant
excess of $\gamma$-rays emission is found at the locations of Car II and Car
III in eight years of Fermi-LAT data.
| astro-ph.GA | we present magellanimacs angloaustralian telescopeaaomega2df and very large telescopegiraffeflames spectroscopy of the carinaii car ii carina iii car iii dwarf galaxy candidates recently discovered in the magellanic satellites survey maglites we identify 18 member stars in car ii including 2 binaries with variable radial velocities and 2 rr lyrae stars the other 14 members have a mean heliocentric velocity v_rm hel 4772 pm 12 kms and a velocity dispersion of sigma_v 3412_08 kms assuming car ii is in dynamical equilibrium we derive a total mass within the halflight radius of 1008_04 times 106 m_odot indicating a masstolight ratio of 369309_161 m_odotl_odot from equivalent width measurements of the calcium triplet lines of 9 rgb stars we derive a mean metallicity of feh 244 pm 009 with dispersion sigma_rm feh 022 010_007 considering both the kinematic and chemical properties we conclude that car ii is a darkmatterdominated dwarf galaxy for car iii we identify 4 member stars from which we calculate a systemic velocity of v_rm hel 284634_31 kms the brightest rgb member of car iii has a metallicity of feh 197 pm 012 due to the small size of the car iii spectroscopic sample we cannot conclusively determine its nature although these two systems have the smallest known physical separation delta dsim10kpc among local group satellites the large difference in their systemic velocities sim200 kms indicates that they are unlikely to be a bound pair one or both systems are likely associated with the large magellanic cloud lmc and may remain lmc satellites today no statistically significant excess of gammarays emission is found at the locations of car ii and car iii in eight years of fermilat data | [['we', 'present', 'magellanimacs', 'angloaustralian', 'telescopeaaomega2df', 'and', 'very', 'large', 'telescopegiraffeflames', 'spectroscopy', 'of', 'the', 'carinaii', 'car', 'ii', 'carina', 'iii', 'car', 'iii', 'dwarf', 'galaxy', 'candidates', 'recently', 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1,802.06811 | Scaling Relations for Dark Matter Annihilation and Decay Profiles in
Dwarf Spheroidal Galaxies | Measuring the dark matter distribution in dwarf spheroidal galaxies (dSphs)
from stellar kinematics is crucial for indirect dark matter searches, as these
distributions set the fluxes for both dark matter annihilation (J-Factor) and
decay (D-Factor). Here we produce a compilation of J and D-Factors for dSphs,
including new calculations for several newly-discovered Milky Way (MW)
satellites, for dSphs outside of the MW virial radius, and for M31 satellites.
From this compilation we test for scaling relations between the J and D-factors
and physical properties of the dSphs such as the velocity dispersion
($\sigma_{\mathrm{los}}$), the distance ($d$), and the stellar half-light
radius ($r_{1/2}$). We find that the following scaling relation minimizes the
residuals as compared to different functional dependencies on the observed
dSphs properties $J(0.5 {\rm deg}) = 10^{17.72}
\left(\sigma_{\mathrm{los}}/5\,{\rm km \, s^{-1}}\right)^4 \left(d / 100\,{\rm
kpc}\right)^{-2}\left( r_{1/2}/100 \,{\rm pc} \right)^{-1}$. We find this
relation has considerably smaller scatter as compared to the simpler relations
that scale only as $1/d^2$. We further explore scalings with luminosity
($L_V$), and find that the data do not strongly prefer a scaling including
$L_V$ as compared to a pure $1/d^2$ scaling. The scaling relations we derive
can be used to estimate the J-Factor without the full dynamical analysis, and
will be useful for estimating limits on particle dark matter properties from
new systems that do not have high-quality stellar kinematics.
| astro-ph.GA | measuring the dark matter distribution in dwarf spheroidal galaxies dsphs from stellar kinematics is crucial for indirect dark matter searches as these distributions set the fluxes for both dark matter annihilation jfactor and decay dfactor here we produce a compilation of j and dfactors for dsphs including new calculations for several newlydiscovered milky way mw satellites for dsphs outside of the mw virial radius and for m31 satellites from this compilation we test for scaling relations between the j and dfactors and physical properties of the dsphs such as the velocity dispersion sigma_mathrmlos the distance d and the stellar halflight radius r_12 we find that the following scaling relation minimizes the residuals as compared to different functional dependencies on the observed dsphs properties j05 rm deg 101772 leftsigma_mathrmlos5rm km s1right4 leftd 100rm kpcright2left r_12100 rm pc right1 we find this relation has considerably smaller scatter as compared to the simpler relations that scale only as 1d2 we further explore scalings with luminosity l_v and find that the data do not strongly prefer a scaling including l_v as compared to a pure 1d2 scaling the scaling relations we derive can be used to estimate the jfactor without the full dynamical analysis and will be useful for estimating limits on particle dark matter properties from new systems that do not have highquality stellar kinematics | [['measuring', 'the', 'dark', 'matter', 'distribution', 'in', 'dwarf', 'spheroidal', 'galaxies', 'dsphs', 'from', 'stellar', 'kinematics', 'is', 'crucial', 'for', 'indirect', 'dark', 'matter', 'searches', 'as', 'these', 'distributions', 'set', 'the', 'fluxes', 'for', 'both', 'dark', 'matter', 'annihilation', 'jfactor', 'and', 'decay', 'dfactor', 'here', 'we', 'produce', 'a', 'compilation', 'of', 'j', 'and', 'dfactors', 'for', 'dsphs', 'including', 'new', 'calculations', 'for', 'several', 'newlydiscovered', 'milky', 'way', 'mw', 'satellites', 'for', 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1,802.06812 | Spectral band degeneracies of $\frac{\pi}{2}-$rotationally invariant
periodic Schr\"odinger operators | The dynamics of waves in periodic media is determined by the band structure
of the underlying periodic Hamiltonian. Symmetries of the Hamiltonian can give
rise to novel properties of the band structure. Here we consider a class of
periodic Schr\"odinger operators, $H_V=-\Delta+V$, where $V$ is periodic with
respect to the lattice of translates $\Lambda=\mathbb{Z}^2$. The potential is
also assumed to be real-valued, sufficiently regular and such that, with
respect to some origin of coordinates, inversion symmetric (even) and invariant
under $\pi/2$ rotation. The present results are the $\mathbb{Z}^2-$ analogue of
results obtained for conical degenerate points (Dirac points) in honeycomb
structures. Our proofs make use of the framework developed by
Fefferman-Weinstein and Fefferman-Lee-Thorp-Weinstein.
| math.AP cond-mat.mtrl-sci | the dynamics of waves in periodic media is determined by the band structure of the underlying periodic hamiltonian symmetries of the hamiltonian can give rise to novel properties of the band structure here we consider a class of periodic schrodinger operators h_vdeltav where v is periodic with respect to the lattice of translates lambdamathbbz2 the potential is also assumed to be realvalued sufficiently regular and such that with respect to some origin of coordinates inversion symmetric even and invariant under pi2 rotation the present results are the mathbbz2 analogue of results obtained for conical degenerate points dirac points in honeycomb structures our proofs make use of the framework developed by feffermanweinstein and feffermanleethorpweinstein | [['the', 'dynamics', 'of', 'waves', 'in', 'periodic', 'media', 'is', 'determined', 'by', 'the', 'band', 'structure', 'of', 'the', 'underlying', 'periodic', 'hamiltonian', 'symmetries', 'of', 'the', 'hamiltonian', 'can', 'give', 'rise', 'to', 'novel', 'properties', 'of', 'the', 'band', 'structure', 'here', 'we', 'consider', 'a', 'class', 'of', 'periodic', 'schrodinger', 'operators', 'h_vdeltav', 'where', 'v', 'is', 'periodic', 'with', 'respect', 'to', 'the', 'lattice', 'of', 'translates', 'lambdamathbbz2', 'the', 'potential', 'is', 'also', 'assumed', 'to', 'be', 'realvalued', 'sufficiently', 'regular', 'and', 'such', 'that', 'with', 'respect', 'to', 'some', 'origin', 'of', 'coordinates', 'inversion', 'symmetric', 'even', 'and', 'invariant', 'under', 'pi2', 'rotation', 'the', 'present', 'results', 'are', 'the', 'mathbbz2', 'analogue', 'of', 'results', 'obtained', 'for', 'conical', 'degenerate', 'points', 'dirac', 'points', 'in', 'honeycomb', 'structures', 'our', 'proofs', 'make', 'use', 'of', 'the', 'framework', 'developed', 'by', 'feffermanweinstein', 'and', 'feffermanleethorpweinstein']] | [-0.17493956122246204, 0.1327938407012304, -0.05502520600726845, 0.03110690418857261, -0.09233454219920031, -0.12206723045027994, 0.01952531718255935, 0.3904804466035935, -0.2892808119228127, -0.2207955942850201, 0.1104254862293601, -0.26667470908766494, -0.18674809173809007, 0.16694207779140374, -0.02075307832501077, 0.04209388594074739, 0.046042462825826413, 0.029471656057658956, -0.11372749169929586, -0.19862670720332737, 0.36929544526229213, -0.0059404556656581, 0.22301487774596712, 0.024007694451287902, 0.051578000081070795, 0.011334093894228476, 0.02824520297485207, 0.011801349802301565, -0.14185730055426599, 0.12155661698208627, 0.18181004804140383, -0.006930288867255963, 0.185545104427622, -0.43886677830249343, -0.1951241999856034, 0.077409433747787, 0.09793640545424108, 0.09990410102368973, -0.054396465407906595, -0.31851388223537613, 0.0962961404157136, -0.09316162076360042, -0.24302987973932005, -0.08875009725126651, 0.026110400526929613, 0.05421983014894735, -0.2717834425066948, 0.05448216463224492, 0.10112803585511214, 0.059563173859064046, -0.08731932874657897, -0.06433831282609373, -0.07663040695105329, 0.093858763438846, 0.036946722478264034, 0.02276704943986661, 0.037313964316160034, -0.06179951396642612, -0.13122314580934072, 0.4668580766664733, -0.06670738202989648, -0.23704320627746361, 0.1558978737656608, -0.1475687188709394, -0.09541356417034334, 0.15296927909793998, 0.1504463483622178, 0.09375763762691015, -0.1170868015593909, 0.15527240502479306, -0.07244831741864391, 0.12792665427956526, 0.06806302332712355, 0.054052624415708794, 0.1959116824586457, 0.09258294990286231, 0.13007125977871067, 0.1456037258778468, -0.053498086446913284, -0.11217159290003394, -0.2978288003354581, -0.11107188030445111, -0.1979276410201479, 0.0858350131455638, -0.06567211157373695, -0.212405305065283, 0.4545142794745641, 0.10507602490689777, 0.2146385957961133, 0.016178921616952353, 0.17946324652966555, 0.14759205606949746, 0.032835461036942966, 0.0638165486893198, 0.18958989477533753, 0.15279686890559596, 0.041278084731498445, -0.1983439887087758, -0.005159825150675456, 0.08698805991491866] |
1,802.06813 | Stellar populations of galaxies in the ALHAMBRA survey up to $z \sim 1$.
III. The stellar content of the quiescent galaxy population during the last
$8$ Gyr | We aim at constraining the stellar population properties of quiescent
galaxies. These properties reveal how these galaxies evolved and assembled
since $z\sim1$ up to the present time. Combining the ALHAMBRA multi-filter
photo-spectra with the SED-fitting code MUFFIT, we build a complete catalogue
of quiescent galaxies via the dust-corrected stellar mass vs colour diagram.
This catalogue includes stellar population properties, such as age,
metallicity, extinction, stellar mass and photometric redshift, retrieved from
the analysis of composited populations based on two independent sets of SSP
models. We develop and apply a novel methodology to provide, for the first
time, the analytic probability distribution functions (PDFs) of mass-weighted
age, metallicity, and extinction of quiescent galaxies as a function of
redshift and stellar mass. We adopt different star formation histories to
discard potential systematics in the analysis. The number density of quiescent
galaxies is found to increase since $z\sim1$, with a more substantial variation
at lower mass. Quiescent galaxies feature extinction $A_V<0.6$, with median
values in the range $A_V = 0.15\mathrm{-}0.3$. At increasing stellar mass,
quiescent galaxies are older and more metal rich since $z\sim1$. A detailed
analysis of the PDFs reveals that the evolution of quiescent galaxies is not
compatible with passive evolution and a slight decrease is hinted at median
metallicity $0.1\mathrm{-}0.2$~dex. The intrinsic dispersion of the age and
metallicity PDFs show a dependence with stellar mass and/or redshift. These
results are consistent with both sets of SSP models and the alternative SFH
assumptions explored. Consequently, the quiescent population must undergo an
evolutive pathway including mergers and/or remnants of star formation to
reconcile the observed trends, where the `progenitor' bias should also be taken
into account.
| astro-ph.GA | we aim at constraining the stellar population properties of quiescent galaxies these properties reveal how these galaxies evolved and assembled since zsim1 up to the present time combining the alhambra multifilter photospectra with the sedfitting code muffit we build a complete catalogue of quiescent galaxies via the dustcorrected stellar mass vs colour diagram this catalogue includes stellar population properties such as age metallicity extinction stellar mass and photometric redshift retrieved from the analysis of composited populations based on two independent sets of ssp models we develop and apply a novel methodology to provide for the first time the analytic probability distribution functions pdfs of massweighted age metallicity and extinction of quiescent galaxies as a function of redshift and stellar mass we adopt different star formation histories to discard potential systematics in the analysis the number density of quiescent galaxies is found to increase since zsim1 with a more substantial variation at lower mass quiescent galaxies feature extinction a_v06 with median values in the range a_v 015mathrm03 at increasing stellar mass quiescent galaxies are older and more metal rich since zsim1 a detailed analysis of the pdfs reveals that the evolution of quiescent galaxies is not compatible with passive evolution and a slight decrease is hinted at median metallicity 01mathrm02dex the intrinsic dispersion of the age and metallicity pdfs show a dependence with stellar mass andor redshift these results are consistent with both sets of ssp models and the alternative sfh assumptions explored consequently the quiescent population must undergo an evolutive pathway including mergers andor remnants of star formation to reconcile the observed trends where the progenitor bias should also be taken into account | [['we', 'aim', 'at', 'constraining', 'the', 'stellar', 'population', 'properties', 'of', 'quiescent', 'galaxies', 'these', 'properties', 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1,802.06814 | Next Generation Virgo Cluster Survey (NGVS). XXXII:~Search for a
Globular Cluster Substructure in the Virgo Galaxy Cluster Core | Substructure in globular cluster (GC) populations around large galaxies is
expected in galaxy formation scenarios that involve accretion or merger events,
and it has been searched for using direct associations between GCs and
structure in the diffuse galaxy light, or with GC kinematics. Here, we present
a search for candidate substructures in the GC population around the Virgo cD
galaxy M87 through the analysis of the spatial distribution of the GC
colors.~The study is based on a sample of $\sim\!1800$ bright GCs with
high-quality $u,g,r,i,z,K_s$ photometry, selected to ensure a low contamination
by foreground stars or background galaxies.~The spectral energy distributions
of the GCs are associated with formal estimates of age and metallicity, which
are representative of its position in a 4-D color-space relative to standard
single stellar population models.~Dividing the sample into broad bins based on
the relative formal ages, we observe inhomogeneities which reveal signatures of
GC substructures.~The most significant of these is a spatial overdensity of GCs
with relatively young age labels, of diameter $\sim\!0.1$\,deg
($\sim\!30\,$kpc), located to the south of M87.~The significance of this
detection is larger than about 5$\sigma$ after accounting for estimates of
random and systematic errors.~Surprisingly, no large Virgo galaxy is present in
this area, that could potentially host these GCs.~But candidate substructures
in the M87 halo with equally elusive hosts have been described based on
kinematic studies in the past.~The number of GC spectra available around M87 is
currently insufficient to clarify the nature of the new candidate substructure.
| astro-ph.GA | substructure in globular cluster gc populations around large galaxies is expected in galaxy formation scenarios that involve accretion or merger events and it has been searched for using direct associations between gcs and structure in the diffuse galaxy light or with gc kinematics here we present a search for candidate substructures in the gc population around the virgo cd galaxy m87 through the analysis of the spatial distribution of the gc colorsthe study is based on a sample of sim1800 bright gcs with highquality ugrizk_s photometry selected to ensure a low contamination by foreground stars or background galaxiesthe spectral energy distributions of the gcs are associated with formal estimates of age and metallicity which are representative of its position in a 4d colorspace relative to standard single stellar population modelsdividing the sample into broad bins based on the relative formal ages we observe inhomogeneities which reveal signatures of gc substructuresthe most significant of these is a spatial overdensity of gcs with relatively young age labels of diameter sim01deg sim30kpc located to the south of m87the significance of this detection is larger than about 5sigma after accounting for estimates of random and systematic errorssurprisingly no large virgo galaxy is present in this area that could potentially host these gcsbut candidate substructures in the m87 halo with equally elusive hosts have been described based on kinematic studies in the pastthe number of gc spectra available around m87 is currently insufficient to clarify the nature of the new candidate substructure | [['substructure', 'in', 'globular', 'cluster', 'gc', 'populations', 'around', 'large', 'galaxies', 'is', 'expected', 'in', 'galaxy', 'formation', 'scenarios', 'that', 'involve', 'accretion', 'or', 'merger', 'events', 'and', 'it', 'has', 'been', 'searched', 'for', 'using', 'direct', 'associations', 'between', 'gcs', 'and', 'structure', 'in', 'the', 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1,802.06815 | Floquet engineering of optical solenoids and quantized charge pumping
along tailored paths in two-dimensional Chern insulators | The insertion of a local magnetic flux, as the one created by a thin
solenoid, plays an important role in gedanken experiments of quantum Hall
physics. By combining Floquet engineering of artificial magnetic fields with
the ability of single-site addressing in quantum-gas microscopes, we propose a
scheme for the realization of such local solenoid-type magnetic fields in
optical lattices. We show that it can be employed to manipulate and probe
elementary excitations of a topological Chern insulator. This includes
quantized adiabatic charge pumping along tailored paths inside the bulk, as
well as the controlled population of edge modes.
| cond-mat.quant-gas cond-mat.mes-hall physics.atom-ph quant-ph | the insertion of a local magnetic flux as the one created by a thin solenoid plays an important role in gedanken experiments of quantum hall physics by combining floquet engineering of artificial magnetic fields with the ability of singlesite addressing in quantumgas microscopes we propose a scheme for the realization of such local solenoidtype magnetic fields in optical lattices we show that it can be employed to manipulate and probe elementary excitations of a topological chern insulator this includes quantized adiabatic charge pumping along tailored paths inside the bulk as well as the controlled population of edge modes | [['the', 'insertion', 'of', 'a', 'local', 'magnetic', 'flux', 'as', 'the', 'one', 'created', 'by', 'a', 'thin', 'solenoid', 'plays', 'an', 'important', 'role', 'in', 'gedanken', 'experiments', 'of', 'quantum', 'hall', 'physics', 'by', 'combining', 'floquet', 'engineering', 'of', 'artificial', 'magnetic', 'fields', 'with', 'the', 'ability', 'of', 'singlesite', 'addressing', 'in', 'quantumgas', 'microscopes', 'we', 'propose', 'a', 'scheme', 'for', 'the', 'realization', 'of', 'such', 'local', 'solenoidtype', 'magnetic', 'fields', 'in', 'optical', 'lattices', 'we', 'show', 'that', 'it', 'can', 'be', 'employed', 'to', 'manipulate', 'and', 'probe', 'elementary', 'excitations', 'of', 'a', 'topological', 'chern', 'insulator', 'this', 'includes', 'quantized', 'adiabatic', 'charge', 'pumping', 'along', 'tailored', 'paths', 'inside', 'the', 'bulk', 'as', 'well', 'as', 'the', 'controlled', 'population', 'of', 'edge', 'modes']] | [-0.1736708427209179, 0.2477499436899219, -0.04979796289010163, 0.03457330462251961, -0.03250584649444767, -0.1421394539968472, 0.04016801045627846, 0.3707683737180671, -0.2673701023521396, -0.3213470243867867, 0.021335178671395217, -0.22288610945854867, -0.13582091024252396, 0.22828322604336604, -0.006948985508643091, 0.06635032836240906, -0.02963368342809227, -0.036646777253160824, -0.028915363981635595, -0.1812526513964926, 0.2862701214561435, 0.031555942405842016, 0.3086082923359105, 0.05308180604111023, 0.08133244530145763, 0.06060753934018846, 0.04380681600489378, 0.0480968373428498, -0.09639126615759464, 0.09591978503960157, 0.2498297012049933, -0.03509758639253904, 0.23835800389987322, -0.5118078059915986, -0.22022134491850678, 0.030145915500743657, 0.14907430548562992, 0.17204757645840243, -0.1111843126911518, -0.2901609740885241, 0.027730653618405363, -0.14955732760931917, -0.15965247121924647, -0.1296831952141864, -0.020089347390648053, 0.000700685961233756, -0.23679188766804218, 0.037197641797876935, 0.08121628942899406, 0.10121821525639721, -0.06030536971140501, -0.033514435897220154, -0.04014582139658457, 0.10024513379309555, -0.019159759261778424, 0.04870528850124731, 0.20071085119543938, -0.1811071080084396, -0.20681986045472475, 0.36711636843749, -0.08429179917450766, -0.14547645190863737, 0.16436263039822177, -0.10581725691112556, -0.0633270112769108, 0.08754611155730957, 0.12523417965786968, 0.09334382076025466, -0.08344619899360957, 0.09216137148133403, -0.040097568407464694, 0.12622981410644643, 0.03551178248551655, 0.11432337006839106, 0.31000953350140126, 0.17059286690925304, 0.07859425635934732, 0.18770497464170985, -0.11978476888881621, -0.05538642839338554, -0.2787689336775137, -0.2192289681953131, -0.2593183170657187, 0.09799136966466904, 0.005276703499215988, -0.196797906178791, 0.42309999659701875, 0.16065028627707187, 0.1733657700693881, -0.1308034809344277, 0.2950114541715581, 0.11052247145770318, 0.10370427108968475, 0.01945600708309865, 0.2369494302345592, 0.1834889486318036, 0.10339218934262005, -0.2789228335117959, -0.018339634510659973, 0.0647913076135577] |
1,802.06816 | Shield: Fast, Practical Defense and Vaccination for Deep Learning using
JPEG Compression | The rapidly growing body of research in adversarial machine learning has
demonstrated that deep neural networks (DNNs) are highly vulnerable to
adversarially generated images. This underscores the urgent need for practical
defense that can be readily deployed to combat attacks in real-time. Observing
that many attack strategies aim to perturb image pixels in ways that are
visually imperceptible, we place JPEG compression at the core of our proposed
Shield defense framework, utilizing its capability to effectively "compress
away" such pixel manipulation. To immunize a DNN model from artifacts
introduced by compression, Shield "vaccinates" a model by re-training it with
compressed images, where different compression levels are applied to generate
multiple vaccinated models that are ultimately used together in an ensemble
defense. On top of that, Shield adds an additional layer of protection by
employing randomization at test time that compresses different regions of an
image using random compression levels, making it harder for an adversary to
estimate the transformation performed. This novel combination of vaccination,
ensembling, and randomization makes Shield a fortified multi-pronged
protection. We conducted extensive, large-scale experiments using the ImageNet
dataset, and show that our approaches eliminate up to 94% of black-box attacks
and 98% of gray-box attacks delivered by the recent, strongest attacks, such as
Carlini-Wagner's L2 and DeepFool. Our approaches are fast and work without
requiring knowledge about the model.
| cs.CV cs.AI cs.CR | the rapidly growing body of research in adversarial machine learning has demonstrated that deep neural networks dnns are highly vulnerable to adversarially generated images this underscores the urgent need for practical defense that can be readily deployed to combat attacks in realtime observing that many attack strategies aim to perturb image pixels in ways that are visually imperceptible we place jpeg compression at the core of our proposed shield defense framework utilizing its capability to effectively compress away such pixel manipulation to immunize a dnn model from artifacts introduced by compression shield vaccinates a model by retraining it with compressed images where different compression levels are applied to generate multiple vaccinated models that are ultimately used together in an ensemble defense on top of that shield adds an additional layer of protection by employing randomization at test time that compresses different regions of an image using random compression levels making it harder for an adversary to estimate the transformation performed this novel combination of vaccination ensembling and randomization makes shield a fortified multipronged protection we conducted extensive largescale experiments using the imagenet dataset and show that our approaches eliminate up to 94 of blackbox attacks and 98 of graybox attacks delivered by the recent strongest attacks such as carliniwagners l2 and deepfool our approaches are fast and work without requiring knowledge about the model | [['the', 'rapidly', 'growing', 'body', 'of', 'research', 'in', 'adversarial', 'machine', 'learning', 'has', 'demonstrated', 'that', 'deep', 'neural', 'networks', 'dnns', 'are', 'highly', 'vulnerable', 'to', 'adversarially', 'generated', 'images', 'this', 'underscores', 'the', 'urgent', 'need', 'for', 'practical', 'defense', 'that', 'can', 'be', 'readily', 'deployed', 'to', 'combat', 'attacks', 'in', 'realtime', 'observing', 'that', 'many', 'attack', 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1,802.06817 | Bulk hydrodynamic stability and turbulent saturation in compressing hot
spots | For hot spots compressed at constant velocity, we give a hydrodynamic
stability criterion that describes the expected energy behavior of non-radial
hydrodynamic motion for different classes of trajectories (in $\rho R$ --- $T$
space). For a given compression velocity, this criterion depends on $\rho R$,
$T$, and $\mathrm{d}T/\mathrm{d}(\rho R)$ (the trajectory slope), and applies
point-wise, so that the expected behavior can be determined instantaneously
along the trajectory. Among the classes of trajectories are those where the
hydromotion is guaranteed to decrease, and those where the hydromotion is
bounded by a saturated value. We calculate this saturated value, and find the
compression velocities for which hydromotion may be a substantial fraction of
hot-spot energy at burn time. The Lindl "attractor" trajectory (Lindl, 1995) is
shown to experience non-radial hydrodynamic energy that grows towards this
saturated state. Comparing the saturation value to available detailed 3D
simulation results, we find that the fluctuating velocities in these
simulations reach substantial fractions of the saturated value.
| physics.plasm-ph | for hot spots compressed at constant velocity we give a hydrodynamic stability criterion that describes the expected energy behavior of nonradial hydrodynamic motion for different classes of trajectories in rho r t space for a given compression velocity this criterion depends on rho r t and mathrmdtmathrmdrho r the trajectory slope and applies pointwise so that the expected behavior can be determined instantaneously along the trajectory among the classes of trajectories are those where the hydromotion is guaranteed to decrease and those where the hydromotion is bounded by a saturated value we calculate this saturated value and find the compression velocities for which hydromotion may be a substantial fraction of hotspot energy at burn time the lindl attractor trajectory lindl 1995 is shown to experience nonradial hydrodynamic energy that grows towards this saturated state comparing the saturation value to available detailed 3d simulation results we find that the fluctuating velocities in these simulations reach substantial fractions of the saturated value | [['for', 'hot', 'spots', 'compressed', 'at', 'constant', 'velocity', 'we', 'give', 'a', 'hydrodynamic', 'stability', 'criterion', 'that', 'describes', 'the', 'expected', 'energy', 'behavior', 'of', 'nonradial', 'hydrodynamic', 'motion', 'for', 'different', 'classes', 'of', 'trajectories', 'in', 'rho', 'r', 't', 'space', 'for', 'a', 'given', 'compression', 'velocity', 'this', 'criterion', 'depends', 'on', 'rho', 'r', 't', 'and', 'mathrmdtmathrmdrho', 'r', 'the', 'trajectory', 'slope', 'and', 'applies', 'pointwise', 'so', 'that', 'the', 'expected', 'behavior', 'can', 'be', 'determined', 'instantaneously', 'along', 'the', 'trajectory', 'among', 'the', 'classes', 'of', 'trajectories', 'are', 'those', 'where', 'the', 'hydromotion', 'is', 'guaranteed', 'to', 'decrease', 'and', 'those', 'where', 'the', 'hydromotion', 'is', 'bounded', 'by', 'a', 'saturated', 'value', 'we', 'calculate', 'this', 'saturated', 'value', 'and', 'find', 'the', 'compression', 'velocities', 'for', 'which', 'hydromotion', 'may', 'be', 'a', 'substantial', 'fraction', 'of', 'hotspot', 'energy', 'at', 'burn', 'time', 'the', 'lindl', 'attractor', 'trajectory', 'lindl', '1995', 'is', 'shown', 'to', 'experience', 'nonradial', 'hydrodynamic', 'energy', 'that', 'grows', 'towards', 'this', 'saturated', 'state', 'comparing', 'the', 'saturation', 'value', 'to', 'available', 'detailed', '3d', 'simulation', 'results', 'we', 'find', 'that', 'the', 'fluctuating', 'velocities', 'in', 'these', 'simulations', 'reach', 'substantial', 'fractions', 'of', 'the', 'saturated', 'value']] | [-0.14594197806495143, 0.17118524459231668, -0.10398494332820857, 0.03076039378841718, -0.04580617943520909, -0.10435179642067766, 0.03911121476459194, 0.3384789003574717, -0.2750567694387908, -0.2804513438926928, 0.07008314639206906, -0.2569357175145697, -0.040538702783930416, 0.18525800764349834, -0.04171698814241368, 0.037387793385804446, 0.08939470703942033, 0.07615191321644299, -0.045398701196126406, -0.2117227282574248, 0.25614795963274045, 0.05504305691182988, 0.25239038107178685, 0.028342096588966793, 0.06189481837888403, -0.049125483963907986, -0.006711616106155627, 0.08259455407453473, -0.21302787270839912, 0.030550555639414105, 0.21187560617815376, 0.09344905700663445, 0.24887962790744952, -0.36092520314825216, -0.2125569246855781, 0.1117159817865669, 0.1463005550193993, 0.08396446179677644, -0.022965299017557513, -0.22511439717743756, 0.1148543297957465, -0.14726103769993093, -0.1698126674208017, -0.04880246394694601, 0.0779018617826719, 0.045704807682043755, -0.29811343859365713, 0.1333781203793936, 0.03352641155826127, 0.03528663210436093, -0.08961310986511456, -0.10749207316376504, -0.07343794440165302, 0.10416334993044887, 0.04878960828642425, 0.050447142349099215, 0.15849050585145377, -0.1440477354068356, -0.010021979746309185, 0.36139211255424425, -0.0919248539392116, -0.1545037068289327, 0.1895566465400464, -0.17059585734698102, -0.08801046596348004, 0.18967999998808094, 0.1713151188696143, 0.12119922996059342, -0.08693296804075253, 0.03440605517793095, -0.050722355043527276, 0.15553081867946955, 0.06908251831575982, -0.005722139191772765, 0.2031775798133147, 0.09875764629258862, 0.07426350770529898, 0.11045651546161059, -0.1000058574670832, -0.10708972985516507, -0.31424993412706814, -0.13486800488646863, -0.15259092597220586, 0.04179942688125672, -0.08674159479648191, -0.12047442148711222, 0.3460303720104385, 0.11585801068997983, 0.23640731005466678, 0.0952936114615954, 0.2782486844507673, 0.14490912981387544, 0.014501585371780602, 0.15184903648863518, 0.26702817332046397, 0.08629811448689387, 0.11765792471160468, -0.2532654061368754, 0.07425586825200801, 0.06859664291129872] |
1,802.06818 | Cuscuton Bounce | In general relativity producing a regular bounce entails violation of Null
Energy Condition for a dynamical source in the model. That generically
indicates existence of ghosts or other instabilities. However, in cuscuton
modification of gravity, the correspondence between a background bounce and
violation of Null Energy Condition for dynamical sources is broken. Cuscuton is
an Infra Red modification and it can make the background go through a regular
bounce. At the same time, since it does not contain any dynamical degrees of
freedom, it does not lead to ghosts or other instabilities. Here, we present a
toy scenario of a regular bouncing cosmology and prove this claim. Our model is
presented as a proof of concept at this point and does not aim to explain
observations in late time cosmology.
| gr-qc hep-th | in general relativity producing a regular bounce entails violation of null energy condition for a dynamical source in the model that generically indicates existence of ghosts or other instabilities however in cuscuton modification of gravity the correspondence between a background bounce and violation of null energy condition for dynamical sources is broken cuscuton is an infra red modification and it can make the background go through a regular bounce at the same time since it does not contain any dynamical degrees of freedom it does not lead to ghosts or other instabilities here we present a toy scenario of a regular bouncing cosmology and prove this claim our model is presented as a proof of concept at this point and does not aim to explain observations in late time cosmology | [['in', 'general', 'relativity', 'producing', 'a', 'regular', 'bounce', 'entails', 'violation', 'of', 'null', 'energy', 'condition', 'for', 'a', 'dynamical', 'source', 'in', 'the', 'model', 'that', 'generically', 'indicates', 'existence', 'of', 'ghosts', 'or', 'other', 'instabilities', 'however', 'in', 'cuscuton', 'modification', 'of', 'gravity', 'the', 'correspondence', 'between', 'a', 'background', 'bounce', 'and', 'violation', 'of', 'null', 'energy', 'condition', 'for', 'dynamical', 'sources', 'is', 'broken', 'cuscuton', 'is', 'an', 'infra', 'red', 'modification', 'and', 'it', 'can', 'make', 'the', 'background', 'go', 'through', 'a', 'regular', 'bounce', 'at', 'the', 'same', 'time', 'since', 'it', 'does', 'not', 'contain', 'any', 'dynamical', 'degrees', 'of', 'freedom', 'it', 'does', 'not', 'lead', 'to', 'ghosts', 'or', 'other', 'instabilities', 'here', 'we', 'present', 'a', 'toy', 'scenario', 'of', 'a', 'regular', 'bouncing', 'cosmology', 'and', 'prove', 'this', 'claim', 'our', 'model', 'is', 'presented', 'as', 'a', 'proof', 'of', 'concept', 'at', 'this', 'point', 'and', 'does', 'not', 'aim', 'to', 'explain', 'observations', 'in', 'late', 'time', 'cosmology']] | [-0.16769808946320644, 0.13630961271533473, -0.18103914400204443, 0.12664820472082983, -0.12211325347710114, -0.17630723476177082, 0.006224010616111068, 0.29468443896263263, -0.21444023015535024, -0.278511017618271, 0.09046582976499429, -0.23596076891363527, -0.11560929900106902, 0.12920653168828442, -0.08345333246442561, -0.03362585199423707, 0.05273608165936401, 0.05406023605655019, -0.06255303075214705, -0.20577600265208346, 0.31151120103268815, 0.09312243498145388, 0.23658352637878405, 0.06242754471201736, 0.08875325269495639, -0.03613953785970807, -0.011454594443337275, 0.02014109200009933, -0.11031970955781827, -0.02542701166552993, 0.19078314955203005, 0.16244813542490683, 0.2513470048801257, -0.43359107865880314, -0.27504268954866207, 0.1745753443423802, 0.13154322128528012, 0.17238789478388544, -0.06332562897318544, -0.22942587432379907, 0.04903320954539455, -0.1383025865760059, -0.22100614681839942, -0.03950892893615394, -0.011066702341374296, -0.0798459791408207, -0.2519140006257938, 0.1383332524054612, 0.09211776499443938, 0.013421598800386373, -0.03156599309653617, -0.0034622878176518357, -0.03031182900751726, 0.030774778317516814, 0.07677749110600696, 0.02334415154495778, 0.09863245418438545, -0.13237777622058414, -0.08571929987161779, 0.4083808299440604, -0.07974674129375042, -0.19389899753822157, 0.20333202266349243, -0.17274406926276592, -0.1764112108064672, 0.11011347463175368, 0.09446831706714315, 0.10408363028501089, -0.1340018344255021, 0.10611044705952875, 0.01665660794824362, 0.17060063331087943, 0.11134091694481098, 0.033234621595609214, 0.3064598272053095, 0.12190880801958534, 0.055439300460812566, 0.07560052998596803, -0.0361833542621193, -0.09546976418306048, -0.42161804017825766, -0.13059012147669607, -0.15279583469606361, 0.08376000856548602, -0.08680700866030887, -0.2126571164354503, 0.3534126906225888, 0.1413973443245945, 0.14219531565188215, 0.042634265447178715, 0.26572156960073, 0.043017140712786034, 0.07893764351924451, 0.09052332500354028, 0.3029980369342061, 0.07830808431250401, 0.10280827020044224, -0.20422080077875693, -0.0031365304719656708, 0.04431113546463446] |
1,802.06819 | Breakdown of magnetic order in the pressurized Kitaev iridate
$\beta$-Li$_2$IrO$_3$ | Temperature-pressure phase diagram of the Kitaev hyperhoneycomb iridate
$\beta$-Li$_2$IrO$_3$ is explored using magnetization, thermal expansion,
magnetostriction, and muon spin rotation ($\mu$SR) measurements, as well as
single-crystal x-ray diffraction under pressure and ab initio calculations. The
Neel temperature of $\beta$-Li$_2$IrO$_3$ increases with the slope of 0.9 K/GPa
upon initial compression, but the reduction in the polarization field $H_c$
reflects a growing instability of the incommensurate order. At 1.4 GPa, the
ordered state breaks down upon a first-order transition giving way to a new
ground state marked by the coexistence of dynamically correlated and frozen
spins. This partial freezing in the absence of any conspicuous structural
defects may indicate classical nature of the resulting pressure-induced spin
liquid, an observation paralleled to the increase in the nearest-neighbor
off-diagonal exchange $\Gamma$ under pressure.
| cond-mat.str-el cond-mat.mtrl-sci | temperaturepressure phase diagram of the kitaev hyperhoneycomb iridate betali_2iro_3 is explored using magnetization thermal expansion magnetostriction and muon spin rotation musr measurements as well as singlecrystal xray diffraction under pressure and ab initio calculations the neel temperature of betali_2iro_3 increases with the slope of 09 kgpa upon initial compression but the reduction in the polarization field h_c reflects a growing instability of the incommensurate order at 14 gpa the ordered state breaks down upon a firstorder transition giving way to a new ground state marked by the coexistence of dynamically correlated and frozen spins this partial freezing in the absence of any conspicuous structural defects may indicate classical nature of the resulting pressureinduced spin liquid an observation paralleled to the increase in the nearestneighbor offdiagonal exchange gamma under pressure | [['temperaturepressure', 'phase', 'diagram', 'of', 'the', 'kitaev', 'hyperhoneycomb', 'iridate', 'betali_2iro_3', 'is', 'explored', 'using', 'magnetization', 'thermal', 'expansion', 'magnetostriction', 'and', 'muon', 'spin', 'rotation', 'musr', 'measurements', 'as', 'well', 'as', 'singlecrystal', 'xray', 'diffraction', 'under', 'pressure', 'and', 'ab', 'initio', 'calculations', 'the', 'neel', 'temperature', 'of', 'betali_2iro_3', 'increases', 'with', 'the', 'slope', 'of', '09', 'kgpa', 'upon', 'initial', 'compression', 'but', 'the', 'reduction', 'in', 'the', 'polarization', 'field', 'h_c', 'reflects', 'a', 'growing', 'instability', 'of', 'the', 'incommensurate', 'order', 'at', '14', 'gpa', 'the', 'ordered', 'state', 'breaks', 'down', 'upon', 'a', 'firstorder', 'transition', 'giving', 'way', 'to', 'a', 'new', 'ground', 'state', 'marked', 'by', 'the', 'coexistence', 'of', 'dynamically', 'correlated', 'and', 'frozen', 'spins', 'this', 'partial', 'freezing', 'in', 'the', 'absence', 'of', 'any', 'conspicuous', 'structural', 'defects', 'may', 'indicate', 'classical', 'nature', 'of', 'the', 'resulting', 'pressureinduced', 'spin', 'liquid', 'an', 'observation', 'paralleled', 'to', 'the', 'increase', 'in', 'the', 'nearestneighbor', 'offdiagonal', 'exchange', 'gamma', 'under', 'pressure']] | [-0.1835703763211969, 0.2949579930242716, -0.06511424742855651, -0.008323954844255318, -0.05426510758679938, -0.08427099303465134, 0.14969645558798672, 0.3706260803135296, -0.279934499672679, -0.2700535476987445, 0.04097384743955593, -0.32961830948732157, -0.0682378800066058, 0.11640041430711803, 0.09753904460618894, 0.026484044407703734, -0.06383701104692421, -0.00596246090194196, -0.18373404041134803, -0.22006948406685345, 0.2422230655800997, 0.04680099398756847, 0.31334574501095125, 0.0661469999486003, 0.04142566157916431, 0.03616104285005307, 0.1338025593278251, 0.022932788104454215, -0.1760453096655912, -0.02953668176593591, 0.251069812557133, -0.08658381738941828, 0.1098474984909155, -0.4073680200895598, -0.21377088418555013, 0.006683344826419917, 0.11265689545119716, 0.14253412933601428, -0.05707768042474379, -0.28832122055062837, 0.02980459326798775, -0.14442041915500275, -0.15934859157734832, -0.14846789859264165, -0.0357392078018278, -0.03212033769196123, -0.23389830660659733, 0.17238483625615753, 0.09050012141007699, 0.15364273127420877, -0.1509615292830407, -0.1475458639392326, -0.07914179296218321, -0.006399386340405705, 0.06271283103373305, 0.15659535344953598, 0.17257203119843043, -0.10556432015854547, -0.12558287244232358, 0.3385617775813669, -0.04018817999934445, 0.011900651889542738, 0.15200840264501037, -0.20516360265585457, -0.11643513256089234, 0.2374747940970859, 0.06516924073879947, 0.04538290421009179, -0.09147363854572177, 0.06079792895385014, 0.03615276964540167, 0.24087001202815725, 0.0592033853140739, -0.00690491363232912, 0.2617168500405816, 0.1951094412365784, 0.03955097980580704, 0.18536890291991506, -0.13564792944681506, -0.09905891326913076, -0.22088859733482896, -0.1392189266630304, -0.18920022959986976, 0.0829508994640999, -0.13449819649056652, -0.20228302994627476, 0.34070150445525843, 0.11806911794521102, 0.15530334701833798, -0.08022641494196511, 0.22550484272669424, 0.07425544146076567, 0.032979498306910195, 0.03558136158092164, 0.24685874112787864, 0.23645122553846373, 0.14635993577106748, -0.35985931907527785, 0.13318106890570322, -0.0016455418963162156] |
1,802.0682 | Tools for higher-order network analysis | Networks are a fundamental model of complex systems throughout the sciences,
and network datasets are typically analyzed through lower-order connectivity
patterns described at the level of individual nodes and edges. However,
higher-order connectivity patterns captured by small subgraphs, also called
network motifs, describe the fundamental structures that control and mediate
the behavior of many complex systems. We develop three tools for network
analysis that use higher-order connectivity patterns to gain new insights into
network datasets: (1) a framework to cluster nodes into modules based on joint
participation in network motifs; (2) a generalization of the clustering
coefficient measurement to investigate higher-order closure patterns; and (3) a
definition of network motifs for temporal networks and fast algorithms for
counting them. Using these tools, we analyze data from biology, ecology,
economics, neuroscience, online social networks, scientific collaborations,
telecommunications, transportation, and the World Wide Web.
| cs.SI cond-mat.stat-mech cs.NA physics.soc-ph stat.ML | networks are a fundamental model of complex systems throughout the sciences and network datasets are typically analyzed through lowerorder connectivity patterns described at the level of individual nodes and edges however higherorder connectivity patterns captured by small subgraphs also called network motifs describe the fundamental structures that control and mediate the behavior of many complex systems we develop three tools for network analysis that use higherorder connectivity patterns to gain new insights into network datasets 1 a framework to cluster nodes into modules based on joint participation in network motifs 2 a generalization of the clustering coefficient measurement to investigate higherorder closure patterns and 3 a definition of network motifs for temporal networks and fast algorithms for counting them using these tools we analyze data from biology ecology economics neuroscience online social networks scientific collaborations telecommunications transportation and the world wide web | [['networks', 'are', 'a', 'fundamental', 'model', 'of', 'complex', 'systems', 'throughout', 'the', 'sciences', 'and', 'network', 'datasets', 'are', 'typically', 'analyzed', 'through', 'lowerorder', 'connectivity', 'patterns', 'described', 'at', 'the', 'level', 'of', 'individual', 'nodes', 'and', 'edges', 'however', 'higherorder', 'connectivity', 'patterns', 'captured', 'by', 'small', 'subgraphs', 'also', 'called', 'network', 'motifs', 'describe', 'the', 'fundamental', 'structures', 'that', 'control', 'and', 'mediate', 'the', 'behavior', 'of', 'many', 'complex', 'systems', 'we', 'develop', 'three', 'tools', 'for', 'network', 'analysis', 'that', 'use', 'higherorder', 'connectivity', 'patterns', 'to', 'gain', 'new', 'insights', 'into', 'network', 'datasets', '1', 'a', 'framework', 'to', 'cluster', 'nodes', 'into', 'modules', 'based', 'on', 'joint', 'participation', 'in', 'network', 'motifs', '2', 'a', 'generalization', 'of', 'the', 'clustering', 'coefficient', 'measurement', 'to', 'investigate', 'higherorder', 'closure', 'patterns', 'and', '3', 'a', 'definition', 'of', 'network', 'motifs', 'for', 'temporal', 'networks', 'and', 'fast', 'algorithms', 'for', 'counting', 'them', 'using', 'these', 'tools', 'we', 'analyze', 'data', 'from', 'biology', 'ecology', 'economics', 'neuroscience', 'online', 'social', 'networks', 'scientific', 'collaborations', 'telecommunications', 'transportation', 'and', 'the', 'world', 'wide', 'web']] | [-0.13700628222595954, 0.05214693302511644, -0.033387180663723974, 0.13284354294243622, -0.0828962986108283, -0.13648456969941167, 0.04935432451409878, 0.38575512414771906, -0.3235437997065904, -0.3283682562096018, 0.0729769420413248, -0.2831323631009428, -0.2915502415484631, 0.17323027089284077, -0.03912381526463154, 0.040579718342510014, 0.11387331700477173, 0.01707934805939735, 0.05396478687098224, -0.2016216706300915, 0.3154975561274242, 0.02451079076444599, 0.361045153693519, 0.033266704408189574, 0.07117200019182375, 0.014411559436653912, -0.07049191978507557, 0.04647742074251857, -0.12097310235866912, 0.21323608309948738, 0.3376063967933616, 0.23294102738637634, 0.3114316132391842, -0.4680272986404073, -0.26081019468625194, 0.10889169268152664, 0.1562302840765382, 0.07484499399708486, 0.03577663308963783, -0.31196698213560164, 0.10341890050511493, -0.16032028576673965, -0.048702125227682184, -0.14818778147422512, 0.005870035524860444, 0.05303318505782083, -0.22499154503194904, 0.032093538107263564, 0.008088021514556882, 0.11257291820712312, 0.0027942369105032, -0.09764683382375769, -0.013089581451732928, 0.20619374391635958, -0.022897238756446364, -0.05493487087123483, 0.1694919679110581, -0.18114509985414923, -0.20372626177546843, 0.35269775511828105, 0.03139448586956296, -0.15360479883219993, 0.19340402971703927, -0.060633590884349296, -0.22543106012006986, 0.08435535773759524, 0.28841016485526316, 0.0362246741809633, -0.20302154371042697, 0.013569606362375133, -0.0011157289960644615, 0.18808364175738845, 0.06790230834600844, 0.03597800014540553, 0.16792250721400578, 0.23421844272730005, 0.06344242413933257, 0.0748136546110249, -0.04475037484371569, -0.11544815105595954, -0.16841276043789907, -0.06980492911157264, -0.17122541139604078, -0.030879421624466514, -0.16885272499676432, -0.15278935907851302, 0.4404813627791132, 0.11817357979688636, 0.16808074946895663, 0.08933922025689882, 0.28010921115973886, -0.0012793101298189918, 0.1163208239259277, 0.08099603326827236, 0.12503996315169555, 0.12311934436586174, 0.1808183405213845, -0.12407918032307938, 0.06439424377561113, 0.03606578623580838] |
1,802.06821 | Integrated Tools for Engineering Ontologies | The article presents an overview of current specialized ontology engineering
tools, as well as texts' annotation tools based on ontologies. The main
functions and features of these tools, their advantages and disadvantages are
discussed. A systematic comparative analysis of means for engineering
ontologies is presented.
| cs.AI | the article presents an overview of current specialized ontology engineering tools as well as texts annotation tools based on ontologies the main functions and features of these tools their advantages and disadvantages are discussed a systematic comparative analysis of means for engineering ontologies is presented | [['the', 'article', 'presents', 'an', 'overview', 'of', 'current', 'specialized', 'ontology', 'engineering', 'tools', 'as', 'well', 'as', 'texts', 'annotation', 'tools', 'based', 'on', 'ontologies', 'the', 'main', 'functions', 'and', 'features', 'of', 'these', 'tools', 'their', 'advantages', 'and', 'disadvantages', 'are', 'discussed', 'a', 'systematic', 'comparative', 'analysis', 'of', 'means', 'for', 'engineering', 'ontologies', 'is', 'presented']] | [-0.03655568440250742, -0.054786692815509415, -0.03648752487238704, 0.12178685155102155, -0.1470759588500692, -0.05694959837322434, 0.014846633798960182, 0.40304025312264763, -0.2612168507857455, -0.3223430360563927, 0.1251884228653378, -0.30340387707369193, -0.16392913394504124, 0.2699957609176636, -0.09199444649534093, 0.08081370014697313, 0.09570879963123136, -0.041062490724855, -0.06710916375741363, -0.17655535261664126, 0.3426808340681924, 0.038547114645027455, 0.3994332609905137, 0.09843868706375361, 0.039944744813773365, -0.02329201472716199, -0.19456626964319085, -0.008168058138754633, -0.13841742087776462, 0.20880452475200098, 0.4327784517262545, 0.30009267730638384, 0.3389884252515104, -0.42919852191375363, -0.16226953674728672, -0.038588941397352354, 0.18188354587182404, 0.10081562420560254, -0.07392674892778611, -0.33598975831021866, 0.040973757869667476, -0.18495096507896153, -0.0937790070556932, -0.17718218341469766, 0.013798256642702553, 0.11154180560261011, -0.15519810645944543, -0.038439658284187314, 0.09404998799630751, 0.2252913009789255, -0.007195562631305721, -0.24725449757857454, 0.06349494121451345, 0.16237841732800007, 0.05573082302903964, 0.008947084326710967, 0.1684227511493696, -0.125847105236931, -0.23075338948725, 0.36433711116098694, 0.010834380673865477, -0.22221685238958647, 0.2349157251469377, 0.05713984943512413, -0.18776678334300717, 0.005542206039859189, 0.14146364952127138, 0.08204948163280884, -0.24583192761573527, 0.05815797691595637, 0.1134613062772486, 0.18361899728576342, 0.003923086728900671, 0.06780788290003935, 0.20529948870340983, 0.2941848274734285, -0.03306678736375438, 0.13512161018119917, 0.02347566690813336, -0.06732251695874665, -0.35209599269760977, -0.18557984781348044, -0.14494580290176803, -0.04848010624603679, -0.04624665195005946, -0.19964044669436085, 0.42853362725840677, 0.18739326630925968, 0.04536157939583063, 0.010712805307573743, 0.3962468864603175, 0.029753303222565187, 0.05127435388147003, 0.005682869079626269, 0.13742576663692793, 0.09391530147857136, 0.1822370067756209, -0.07429694180480308, 0.0796356610643367, 0.04420036023172239] |
1,802.06822 | Online Detection of Action Start in Untrimmed, Streaming Videos | We aim to tackle a novel task in action detection - Online Detection of
Action Start (ODAS) in untrimmed, streaming videos. The goal of ODAS is to
detect the start of an action instance, with high categorization accuracy and
low detection latency. ODAS is important in many applications such as early
alert generation to allow timely security or emergency response. We propose
three novel methods to specifically address the challenges in training ODAS
models: (1) hard negative samples generation based on Generative Adversarial
Network (GAN) to distinguish ambiguous background, (2) explicitly modeling the
temporal consistency between data around action start and data succeeding
action start, and (3) adaptive sampling strategy to handle the scarcity of
training data. We conduct extensive experiments using THUMOS'14 and
ActivityNet. We show that our proposed methods lead to significant performance
gains and improve the state-of-the-art methods. An ablation study confirms the
effectiveness of each proposed method.
| cs.CV | we aim to tackle a novel task in action detection online detection of action start odas in untrimmed streaming videos the goal of odas is to detect the start of an action instance with high categorization accuracy and low detection latency odas is important in many applications such as early alert generation to allow timely security or emergency response we propose three novel methods to specifically address the challenges in training odas models 1 hard negative samples generation based on generative adversarial network gan to distinguish ambiguous background 2 explicitly modeling the temporal consistency between data around action start and data succeeding action start and 3 adaptive sampling strategy to handle the scarcity of training data we conduct extensive experiments using thumos14 and activitynet we show that our proposed methods lead to significant performance gains and improve the stateoftheart methods an ablation study confirms the effectiveness of each proposed method | [['we', 'aim', 'to', 'tackle', 'a', 'novel', 'task', 'in', 'action', 'detection', 'online', 'detection', 'of', 'action', 'start', 'odas', 'in', 'untrimmed', 'streaming', 'videos', 'the', 'goal', 'of', 'odas', 'is', 'to', 'detect', 'the', 'start', 'of', 'an', 'action', 'instance', 'with', 'high', 'categorization', 'accuracy', 'and', 'low', 'detection', 'latency', 'odas', 'is', 'important', 'in', 'many', 'applications', 'such', 'as', 'early', 'alert', 'generation', 'to', 'allow', 'timely', 'security', 'or', 'emergency', 'response', 'we', 'propose', 'three', 'novel', 'methods', 'to', 'specifically', 'address', 'the', 'challenges', 'in', 'training', 'odas', 'models', '1', 'hard', 'negative', 'samples', 'generation', 'based', 'on', 'generative', 'adversarial', 'network', 'gan', 'to', 'distinguish', 'ambiguous', 'background', '2', 'explicitly', 'modeling', 'the', 'temporal', 'consistency', 'between', 'data', 'around', 'action', 'start', 'and', 'data', 'succeeding', 'action', 'start', 'and', '3', 'adaptive', 'sampling', 'strategy', 'to', 'handle', 'the', 'scarcity', 'of', 'training', 'data', 'we', 'conduct', 'extensive', 'experiments', 'using', 'thumos14', 'and', 'activitynet', 'we', 'show', 'that', 'our', 'proposed', 'methods', 'lead', 'to', 'significant', 'performance', 'gains', 'and', 'improve', 'the', 'stateoftheart', 'methods', 'an', 'ablation', 'study', 'confirms', 'the', 'effectiveness', 'of', 'each', 'proposed', 'method']] | [-0.0723295721661998, 0.004790998785950554, -0.03978885363166531, 0.07783126336988061, -0.10728714023561527, -0.15749506861902773, 0.04246832512629529, 0.44573806886871653, -0.22538431148820867, -0.371628319422404, 0.11227349798815946, -0.2951247794957211, -0.18409353928795705, 0.16557377710472793, -0.19044994654133915, 0.07925582844763994, 0.14196100978180767, 0.050277534370155384, -0.04147820410473893, -0.3065704802175363, 0.282325118232208, 0.08339505399266879, 0.36749985278894504, 0.04932407662272453, 0.12163373253230626, -0.026260976726965358, -0.07931186228680114, -0.03588140863692388, -0.0416617762138776, 0.14478937232789274, 0.324408921049447, 0.2144465415397038, 0.3513736362134417, -0.4279841055845221, -0.2308725359601279, 0.09473959770674507, 0.1097172014748988, 0.09351320472390702, -0.08940033713433271, -0.34013960933623216, 0.11383418845633665, -0.19849291519882778, -0.010465844015901287, -0.14722034936770798, -0.02770919708845516, -0.044926135779048006, -0.2996774028862516, 0.02718308016192168, 0.0548897883699586, 0.05341692842853566, -0.08380582021161292, -0.04838631363585591, 0.07098224441986531, 0.19289319434047988, 0.06696264792544146, 0.04442541566832612, 0.10711226920209205, -0.1984905276540667, -0.1841088747306882, 0.37405143505583205, -0.0968703589697058, -0.15675523712396777, 0.23255306175754717, -0.02773880218466123, -0.18327340853090088, 0.13806414761270086, 0.27568927584836883, 0.15109250724936524, -0.14002333664024869, -0.03146841889421921, 0.03745840090482185, 0.1758841112193962, 0.0466247460913534, -0.023325040261358176, 0.15759713735586653, 0.2725044390062491, 0.046398498887429016, 0.14287740377398828, -0.16076851976569742, -0.025295023319001, -0.21506180233942965, -0.08616075739264488, -0.14560240562384327, -0.015572818831230203, -0.06640781773516209, -0.09803914500866086, 0.3847093714835743, 0.3032765756143878, 0.19824397815857084, 0.08150470208066206, 0.3604277533541123, 0.005905156036218008, 0.051616863343709456, 0.07556706988446725, 0.16490748179766038, -0.029678863271450005, 0.10206889104408523, -0.2236777632900824, 0.046065425372992956, 0.03959622800971071] |
1,802.06823 | Entropy-Isomap: Manifold Learning for High-dimensional Dynamic Processes | Scientific and engineering processes deliver massive high-dimensional data
sets that are generated as non-linear transformations of an initial state and
few process parameters. Mapping such data to a low-dimensional manifold
facilitates better understanding of the underlying processes, and enables their
optimization. In this paper, we first show that off-the-shelf non-linear
spectral dimensionality reduction methods, e.g., Isomap, fail for such data,
primarily due to the presence of strong temporal correlations. Then, we propose
a novel method, Entropy-Isomap, to address the issue. The proposed method is
successfully applied to large data describing a fabrication process of organic
materials. The resulting low-dimensional representation correctly captures
process control variables, allows for low-dimensional visualization of the
material morphology evolution, and provides key insights to improve the
process.
| stat.ML cs.LG | scientific and engineering processes deliver massive highdimensional data sets that are generated as nonlinear transformations of an initial state and few process parameters mapping such data to a lowdimensional manifold facilitates better understanding of the underlying processes and enables their optimization in this paper we first show that offtheshelf nonlinear spectral dimensionality reduction methods eg isomap fail for such data primarily due to the presence of strong temporal correlations then we propose a novel method entropyisomap to address the issue the proposed method is successfully applied to large data describing a fabrication process of organic materials the resulting lowdimensional representation correctly captures process control variables allows for lowdimensional visualization of the material morphology evolution and provides key insights to improve the process | [['scientific', 'and', 'engineering', 'processes', 'deliver', 'massive', 'highdimensional', 'data', 'sets', 'that', 'are', 'generated', 'as', 'nonlinear', 'transformations', 'of', 'an', 'initial', 'state', 'and', 'few', 'process', 'parameters', 'mapping', 'such', 'data', 'to', 'a', 'lowdimensional', 'manifold', 'facilitates', 'better', 'understanding', 'of', 'the', 'underlying', 'processes', 'and', 'enables', 'their', 'optimization', 'in', 'this', 'paper', 'we', 'first', 'show', 'that', 'offtheshelf', 'nonlinear', 'spectral', 'dimensionality', 'reduction', 'methods', 'eg', 'isomap', 'fail', 'for', 'such', 'data', 'primarily', 'due', 'to', 'the', 'presence', 'of', 'strong', 'temporal', 'correlations', 'then', 'we', 'propose', 'a', 'novel', 'method', 'entropyisomap', 'to', 'address', 'the', 'issue', 'the', 'proposed', 'method', 'is', 'successfully', 'applied', 'to', 'large', 'data', 'describing', 'a', 'fabrication', 'process', 'of', 'organic', 'materials', 'the', 'resulting', 'lowdimensional', 'representation', 'correctly', 'captures', 'process', 'control', 'variables', 'allows', 'for', 'lowdimensional', 'visualization', 'of', 'the', 'material', 'morphology', 'evolution', 'and', 'provides', 'key', 'insights', 'to', 'improve', 'the', 'process']] | [-0.05580480813918527, 0.031629751133467915, -0.08462111707314972, 0.07204233627788739, -0.13371225117036134, -0.1153692034658137, 0.025411044319125647, 0.39132496408256123, -0.3425778263856557, -0.33190375419856966, 0.09964667275559527, -0.24281366072291574, -0.20277652209470712, 0.2093593191417042, -0.07641474279182509, 0.11478048456401742, 0.09591144258310356, -0.06197334919509686, -0.05871324144469282, -0.20924898249497406, 0.331704478633921, 0.06277366393545936, 0.359075326980515, 0.014197964775414506, 0.1471000975652113, 0.029837994393700166, -0.04198203340157374, -0.026653747513028216, -0.07105179782247283, 0.17540106810398462, 0.3072643442818325, 0.17849201231440606, 0.2927337416008977, -0.4493255548887263, -0.2685698966287877, 0.0899394383415395, 0.15228410897339206, 0.1327313350221096, -0.05872508697404164, -0.2759815680771327, 0.056650069588410464, -0.11178398787713617, -0.10136813867436953, -0.19823501376081104, -0.024727541364513893, -0.006483511353673583, -0.30245021525154675, 0.04533821491770877, 0.10345331250597561, 0.015205046181010914, -0.06021195548742409, -0.07151646118934367, -0.008658726876678546, 0.163516193154953, 0.012320212655208143, 0.007522775664586912, 0.1391226030763023, -0.1259490513793108, -0.11619221521656929, 0.3869779714698757, -0.032795590171513476, -0.1931375938752466, 0.23380678914264152, -0.08243555098402598, -0.1528706013933132, 0.14372385803163668, 0.2710087560309667, 0.09456500247282491, -0.19998624769986167, 0.06755234697287178, 0.03812863909801053, 0.1859547988904163, -0.049448936396424684, 0.04624840474017888, 0.15759008954479245, 0.2531616364832783, 0.04151347347281196, 0.131926841771207, -0.10099697845010472, -0.07797980673364864, -0.2206354279317393, -0.16143208366533943, -0.17489087549307622, 0.014205208956456382, -0.11096787187107261, -0.17050373079332193, 0.4052562554316857, 0.20657639747123765, 0.23321473663518869, -0.02240762603661615, 0.2950890347484715, 0.09528499991683027, 0.054487961296315404, 0.040408730249051464, 0.15544182119105965, 0.10558280254875825, 0.10510702855300066, -0.1943763339149281, 0.09739624813664705, 0.01277413575194222] |
1,802.06824 | Tailoring multipolar Mie scattering with helicity and angular momentum | Linear scattering processes are usually described as a function of the
parameters of the incident beam. The wavelength, the intensity distribution,
the polarization or the phase are among them. Here, we discuss and
experimentally demonstrate how the angular momentum and the helicity of light
influence the light scattering of spherical particles. We measure the
backscattering of a $4\mu m$ TiO$_2$ single particle deposited on a glass
substrate. The particle is probed at different wavelengths by different beams
with total angular momenta ranging from $-8$ to $+8$ units. It is observed that
the spectral behavior of the particle is highly dependent on the angular
momentum and helicity of the incoming beam. While some of the properties of the
scattered field can be described with a simple resonator model, the scattering
of high angular momentum beams requires a deeper understanding of the
multipolar modes induced in the sphere. We observe that tailoring these induced
multipolar modes can cause a shift and a spectral narrowing of the peaks of the
scattering spectrum. Furthermore, specific combinations of helicity and angular
momentum for the excitation lead to differences in the conservation of helicity
by the system, which has clear consequences on the scattering pattern.
| physics.optics | linear scattering processes are usually described as a function of the parameters of the incident beam the wavelength the intensity distribution the polarization or the phase are among them here we discuss and experimentally demonstrate how the angular momentum and the helicity of light influence the light scattering of spherical particles we measure the backscattering of a 4mu m tio_2 single particle deposited on a glass substrate the particle is probed at different wavelengths by different beams with total angular momenta ranging from 8 to 8 units it is observed that the spectral behavior of the particle is highly dependent on the angular momentum and helicity of the incoming beam while some of the properties of the scattered field can be described with a simple resonator model the scattering of high angular momentum beams requires a deeper understanding of the multipolar modes induced in the sphere we observe that tailoring these induced multipolar modes can cause a shift and a spectral narrowing of the peaks of the scattering spectrum furthermore specific combinations of helicity and angular momentum for the excitation lead to differences in the conservation of helicity by the system which has clear consequences on the scattering pattern | [['linear', 'scattering', 'processes', 'are', 'usually', 'described', 'as', 'a', 'function', 'of', 'the', 'parameters', 'of', 'the', 'incident', 'beam', 'the', 'wavelength', 'the', 'intensity', 'distribution', 'the', 'polarization', 'or', 'the', 'phase', 'are', 'among', 'them', 'here', 'we', 'discuss', 'and', 'experimentally', 'demonstrate', 'how', 'the', 'angular', 'momentum', 'and', 'the', 'helicity', 'of', 'light', 'influence', 'the', 'light', 'scattering', 'of', 'spherical', 'particles', 'we', 'measure', 'the', 'backscattering', 'of', 'a', '4mu', 'm', 'tio_2', 'single', 'particle', 'deposited', 'on', 'a', 'glass', 'substrate', 'the', 'particle', 'is', 'probed', 'at', 'different', 'wavelengths', 'by', 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1,802.06825 | Multi-resolution Tensor Learning for Large-Scale Spatial Data | High-dimensional tensor models are notoriously computationally expensive to
train. We present a meta-learning algorithm, MMT, that can significantly speed
up the process for spatial tensor models. MMT leverages the property that
spatial data can be viewed at multiple resolutions, which are related by
coarsening and finegraining from one resolution to another. Using this
property, MMT learns a tensor model by starting from a coarse resolution and
iteratively increasing the model complexity. In order to not "over-train" on
coarse resolution models, we investigate an information-theoretic fine-graining
criterion to decide when to transition into higher-resolution models. We
provide both theoretical and empirical evidence for the advantages of this
approach. When applied to two real-world large-scale spatial datasets for
basketball player and animal behavior modeling, our approach demonstrate 3 key
benefits: 1) it efficiently captures higher-order interactions (i.e., tensor
latent factors), 2) it is orders of magnitude faster than fixed resolution
learning and scales to very fine-grained spatial resolutions, and 3) it
reliably yields accurate and interpretable models.
| cs.LG | highdimensional tensor models are notoriously computationally expensive to train we present a metalearning algorithm mmt that can significantly speed up the process for spatial tensor models mmt leverages the property that spatial data can be viewed at multiple resolutions which are related by coarsening and finegraining from one resolution to another using this property mmt learns a tensor model by starting from a coarse resolution and iteratively increasing the model complexity in order to not overtrain on coarse resolution models we investigate an informationtheoretic finegraining criterion to decide when to transition into higherresolution models we provide both theoretical and empirical evidence for the advantages of this approach when applied to two realworld largescale spatial datasets for basketball player and animal behavior modeling our approach demonstrate 3 key benefits 1 it efficiently captures higherorder interactions ie tensor latent factors 2 it is orders of magnitude faster than fixed resolution learning and scales to very finegrained spatial resolutions and 3 it reliably yields accurate and interpretable models | [['highdimensional', 'tensor', 'models', 'are', 'notoriously', 'computationally', 'expensive', 'to', 'train', 'we', 'present', 'a', 'metalearning', 'algorithm', 'mmt', 'that', 'can', 'significantly', 'speed', 'up', 'the', 'process', 'for', 'spatial', 'tensor', 'models', 'mmt', 'leverages', 'the', 'property', 'that', 'spatial', 'data', 'can', 'be', 'viewed', 'at', 'multiple', 'resolutions', 'which', 'are', 'related', 'by', 'coarsening', 'and', 'finegraining', 'from', 'one', 'resolution', 'to', 'another', 'using', 'this', 'property', 'mmt', 'learns', 'a', 'tensor', 'model', 'by', 'starting', 'from', 'a', 'coarse', 'resolution', 'and', 'iteratively', 'increasing', 'the', 'model', 'complexity', 'in', 'order', 'to', 'not', 'overtrain', 'on', 'coarse', 'resolution', 'models', 'we', 'investigate', 'an', 'informationtheoretic', 'finegraining', 'criterion', 'to', 'decide', 'when', 'to', 'transition', 'into', 'higherresolution', 'models', 'we', 'provide', 'both', 'theoretical', 'and', 'empirical', 'evidence', 'for', 'the', 'advantages', 'of', 'this', 'approach', 'when', 'applied', 'to', 'two', 'realworld', 'largescale', 'spatial', 'datasets', 'for', 'basketball', 'player', 'and', 'animal', 'behavior', 'modeling', 'our', 'approach', 'demonstrate', '3', 'key', 'benefits', '1', 'it', 'efficiently', 'captures', 'higherorder', 'interactions', 'ie', 'tensor', 'latent', 'factors', '2', 'it', 'is', 'orders', 'of', 'magnitude', 'faster', 'than', 'fixed', 'resolution', 'learning', 'and', 'scales', 'to', 'very', 'finegrained', 'spatial', 'resolutions', 'and', '3', 'it', 'reliably', 'yields', 'accurate', 'and', 'interpretable', 'models']] | [-0.010873030953495422, 0.05847569527013991, -0.11229284072086136, 0.11042717836693466, -0.10710732647780011, -0.1926901878550558, -0.006838767447156786, 0.45175818089259473, -0.3046818222600694, -0.33301684396375514, 0.0875774997864316, -0.24624856636204995, -0.15527558499924476, 0.1690811951241524, -0.06132711938556806, 0.049125782235400615, 0.10174358647640386, -0.012150485472996412, -0.039066239081255, -0.25878496280666896, 0.2889704450726418, 0.06917416966497535, 0.3131356864525914, 0.014345255314099898, 0.16820757721458304, -0.04249793947702728, -0.03041368882915732, 0.05281770414468355, -0.09216911214584465, 0.1464851959892435, 0.28593341856075555, 0.18089614781301197, 0.29271859442247306, -0.4169233824444435, -0.2251505137750561, 0.06662173002884474, 0.1498798604092061, 0.11440041939248459, 0.040936748262582826, -0.28426682742641923, 0.12132288210474454, -0.16211657699413326, -0.05132701426244727, -0.18992818041318438, -0.029696353952536676, -0.04865956894354895, -0.311152469153834, 0.06995651418365902, 0.05185402366446286, 0.060125571968056624, -0.03972665696808069, -0.10392865477833987, 0.009156676478507906, 0.14581047539867564, 0.01304644175429641, 0.012059772395665145, 0.072665480828685, -0.15567298966073773, -0.11697825244713075, 0.36752822474298275, -0.053231809276639536, -0.2045695788919835, 0.2398808161478217, -0.0955079171193264, -0.14160660361280528, 0.14830392967659708, 0.19794866941846545, 0.12336307494310526, -0.10487565124587002, 0.015149001313569365, -0.0013293726483314503, 0.24563450955433724, 0.04614757370237806, 0.002715056976473822, 0.15834658285148623, 0.21709949731338407, 0.06225873357843517, 0.09439938009373003, -0.11556782343328317, -0.09566811469054168, -0.21082550867371228, -0.09779699007679195, -0.17144637876871702, 0.027797049397078097, -0.16731789242414113, -0.08817925077022576, 0.3690772933499297, 0.24300704896166103, 0.2222002200489841, 0.12250303437936165, 0.3508706871085096, 0.04928981066928472, 0.09074453372371996, 0.07641821173757951, 0.14942505977843412, 0.055096903069103816, 0.09817479642551029, -0.1642367118109222, 0.05142580678902294, 0.0735992395727918] |
1,802.06826 | $GW$ self-screening error and its correction using a local density
functional | The self-screening error in electronic structure theory is the part of the
self-interaction error that would remain within the $GW$ approximation if the
exact dynamically screened Coulomb interaction, $W$, were used, causing each
electron to artificially screen its own presence. This introduces error into
the electron density and ionization potential. We propose a simple,
computationally efficient correction to $GW$ calculations in the form of a
local density functional, obtained using a series of finite training systems;
in tests, this eliminates the self-screening errors in the electron density and
ionization potential.
| cond-mat.mtrl-sci | the selfscreening error in electronic structure theory is the part of the selfinteraction error that would remain within the gw approximation if the exact dynamically screened coulomb interaction w were used causing each electron to artificially screen its own presence this introduces error into the electron density and ionization potential we propose a simple computationally efficient correction to gw calculations in the form of a local density functional obtained using a series of finite training systems in tests this eliminates the selfscreening errors in the electron density and ionization potential | [['the', 'selfscreening', 'error', 'in', 'electronic', 'structure', 'theory', 'is', 'the', 'part', 'of', 'the', 'selfinteraction', 'error', 'that', 'would', 'remain', 'within', 'the', 'gw', 'approximation', 'if', 'the', 'exact', 'dynamically', 'screened', 'coulomb', 'interaction', 'w', 'were', 'used', 'causing', 'each', 'electron', 'to', 'artificially', 'screen', 'its', 'own', 'presence', 'this', 'introduces', 'error', 'into', 'the', 'electron', 'density', 'and', 'ionization', 'potential', 'we', 'propose', 'a', 'simple', 'computationally', 'efficient', 'correction', 'to', 'gw', 'calculations', 'in', 'the', 'form', 'of', 'a', 'local', 'density', 'functional', 'obtained', 'using', 'a', 'series', 'of', 'finite', 'training', 'systems', 'in', 'tests', 'this', 'eliminates', 'the', 'selfscreening', 'errors', 'in', 'the', 'electron', 'density', 'and', 'ionization', 'potential']] | [-0.13194360254435902, 0.08479660003342562, -0.09484367089139091, 0.13290241108560522, 0.0011222301464941767, -0.11808240190148353, 0.08500805728318583, 0.35211551457436546, -0.26392070008441804, -0.29335560821410683, 0.0034309027613037162, -0.2756417941509022, -0.12230560045637605, 0.11967713452823873, -0.012204112177197303, 0.03271615298193258, 0.04345449164458033, 3.7283584889438415e-06, -0.13107694994606492, -0.24863375338156604, 0.25722083687885766, 0.10233540288690064, 0.2031752682885983, 0.07184169974902438, 0.054041664224738876, 0.0531670023376743, 0.006665910423422853, 0.028835199038601583, -0.09207330284835835, 0.11939823728882604, 0.22774288128453513, 0.03473226264533069, 0.3515040344791487, -0.4689115334198707, -0.22125084117675822, 0.034720001462847, 0.13642442223305504, 0.17763835372817185, -0.1025987270107079, -0.2727510615458919, 0.048458300427430205, -0.2153512639200522, -0.11787553365445799, -0.09030362629435129, -0.0012447725250644402, 0.03000129089794225, -0.28955955474650386, 0.13616868853051628, -0.03371281088847253, -0.03897697757743623, -0.08884141312834497, -0.09123040133207623, 0.008272140379995107, 0.08402631834873722, 0.022159427743301624, 0.052610501284814544, 0.20010316266885234, -0.10672496054838929, -0.026363529327015082, 0.38139697794492045, -0.08867043021665369, -0.19923047866517057, 0.13168197324913408, -0.1443513205067979, -0.08822315910106732, 0.1984380118134949, 0.1456897516010536, 0.050090244045067164, -0.15357822996835846, 0.14111508949426935, 0.07454477321589366, 0.18854542299458343, 0.03798749257758674, 0.03886697713492645, 0.19811800071038305, 0.13593326307212314, 0.031023535732593803, 0.0741680900255839, -0.16259204497457377, -0.037105917552899985, -0.31945365849468443, -0.1091487643140782, -0.1945387157301108, 0.04380284626968205, -0.05622945999590835, -0.24818790044842495, 0.40778977666211885, 0.1576090327774485, 0.12122125855595288, -0.01221321400225861, 0.3496759263229453, 0.14676174505924186, 0.06870049382559955, 0.07426177057107755, 0.2521708439828621, 0.13738757386648406, 0.010625477124833398, -0.26315280825106635, 0.07899866550675748, 0.06888905317367365] |
1,802.06827 | Theory of Morphogenesis | A model of morphogenesis is proposed based on seven explicit postulates. The
mathematical import and biological significance of the postulates are explored
and discussed.
| q-bio.QM | a model of morphogenesis is proposed based on seven explicit postulates the mathematical import and biological significance of the postulates are explored and discussed | [['a', 'model', 'of', 'morphogenesis', 'is', 'proposed', 'based', 'on', 'seven', 'explicit', 'postulates', 'the', 'mathematical', 'import', 'and', 'biological', 'significance', 'of', 'the', 'postulates', 'are', 'explored', 'and', 'discussed']] | [-0.060530498410419874, 0.05649863835424185, -0.07379436706348012, 0.1303418888952971, -0.10435646500748892, -0.1557615917408839, 0.04724894277751446, 0.31366834700262797, -0.1297589330933988, -0.26397265198950964, 0.08641235732162993, -0.22533180320169777, -0.277327429347982, 0.21070463628469346, -0.08153169318878402, 0.10392311576288193, 0.026030755252577364, 0.06532259092394573, 0.006903309064606826, -0.20677224034443498, 0.2859030565887224, 0.060926871141418815, 0.33292717300355434, 0.05851619504392147, 0.21143213426694274, -0.025003881853384275, -0.14458532278270772, 0.014723992440849543, -0.12792388803791255, 0.2034726693139722, 0.2032506794979175, 0.26682951959082857, 0.25859487274040777, -0.49604802710625034, -0.2651679114205763, 0.02592603866166125, 0.058080425000904747, 0.07786532064589362, -0.043130669573050305, -0.25003299458573264, -0.0043508756983404355, -0.1398483645170927, -0.12148657293679814, -0.05614191836987933, 0.05014288844540715, -0.007685949016983311, -0.20746803345779577, 0.09103258862160146, 0.08129549864679575, 0.14250713175473115, -0.11261392813563968, -0.18009834624050805, -0.05176816364595046, 0.08493843981220077, 0.017241304648147587, -0.10604640026576817, 0.2061217645338426, -0.08547797461505979, -0.22205996047705412, 0.4234064742922783, 0.07037759168694417, -0.23444276101266345, 0.22820007899038805, -0.07214438857045025, -0.20169045467628166, 0.048480750216792025, 0.11843051544080178, 0.039228919272621475, -0.21941801191618046, 0.07571460282876312, -0.029625681539376576, 0.1464171096061667, 0.05501260493959611, -0.02116941559749345, 0.22015297094670436, 0.2610813543821375, -0.1388773574338605, 0.09494547794262569, -0.010117679708249247, -0.20029239108165106, -0.35790274819980067, -0.15846023382619023, -0.12213133585949738, 0.008553702112597724, -0.06968562355298975, -0.11173349506376933, 0.4398806520427267, 0.16549637905942896, 0.13359216352303824, 0.04570004382791618, 0.22789648446875313, 0.04657716649429252, 0.051039252701836325, -0.04660099129735803, 0.3048206876264885, 0.17944496936009577, 0.06515777555371945, -0.1484824350142541, 0.1421253678854555, 0.09445642656525403] |
1,802.06828 | Quantifying the Trade-offs between Energy Consumption and Salt Removal
Rate in Membrane-free Cation Intercalation Desalination | Electrochemical desalination devices that use redox-active cation
intercalation electrodes show promise for desalination of salt-rich water
resources with high water recovery and low energy consumption. While previous
modeling and experiments used ion-exchange membranes to maximize charge
efficiency, here a membrane-free alternative is evaluated to reduce capital
cost by using a porous diaphragm to separate Na$_{1+x}$NiFe(CN)$_6$ electrodes.
Two-dimensional porous-electrode modeling shows that, while charge efficiency
losses are inherent to a diaphragm-based architecture, charge efficiency values
approaching the anion transference number (61$\%$ for NaCl) are achievable for
diaphragms with sufficiently low salt conductance. Closed-form equations are
thereby derived that relate charge efficiency to the non-dimensional P\`{e}clet
and Damk\"ohler numbers that enable the selection of current and flow velocity
to produce a desired degree of desalination. Simulations using these conditions
are used to quantify the tradeoffs between energy consumption and salt removal
rate for diaphragm-based cells operated at a range of currents. The simulated
distributions of reactions are shown to result from the local salt
concentration variations within electrodes using diffusion-potential theory. We
also simulate the cycling dynamics of various flow configurations and show that
flow-through electrodes exceed the degree-of-desalination compared with flow-by
and flow-behind configurations due to solution stagnation within electrodes.
| physics.app-ph | electrochemical desalination devices that use redoxactive cation intercalation electrodes show promise for desalination of saltrich water resources with high water recovery and low energy consumption while previous modeling and experiments used ionexchange membranes to maximize charge efficiency here a membranefree alternative is evaluated to reduce capital cost by using a porous diaphragm to separate na_1xnifecn_6 electrodes twodimensional porouselectrode modeling shows that while charge efficiency losses are inherent to a diaphragmbased architecture charge efficiency values approaching the anion transference number 61 for nacl are achievable for diaphragms with sufficiently low salt conductance closedform equations are thereby derived that relate charge efficiency to the nondimensional peclet and damkohler numbers that enable the selection of current and flow velocity to produce a desired degree of desalination simulations using these conditions are used to quantify the tradeoffs between energy consumption and salt removal rate for diaphragmbased cells operated at a range of currents the simulated distributions of reactions are shown to result from the local salt concentration variations within electrodes using diffusionpotential theory we also simulate the cycling dynamics of various flow configurations and show that flowthrough electrodes exceed the degreeofdesalination compared with flowby and flowbehind configurations due to solution stagnation within electrodes | [['electrochemical', 'desalination', 'devices', 'that', 'use', 'redoxactive', 'cation', 'intercalation', 'electrodes', 'show', 'promise', 'for', 'desalination', 'of', 'saltrich', 'water', 'resources', 'with', 'high', 'water', 'recovery', 'and', 'low', 'energy', 'consumption', 'while', 'previous', 'modeling', 'and', 'experiments', 'used', 'ionexchange', 'membranes', 'to', 'maximize', 'charge', 'efficiency', 'here', 'a', 'membranefree', 'alternative', 'is', 'evaluated', 'to', 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1,802.06829 | Principles of design and software development models of
ontological-driven computer systems | This paper describes the design principles of methodology of
knowledge-oriented information systems based on ontological approach. Such
systems implement technology subject-oriented extraction of knowledge from the
set of natural language texts and their formal and logical presentation and
application processing
| cs.AI | this paper describes the design principles of methodology of knowledgeoriented information systems based on ontological approach such systems implement technology subjectoriented extraction of knowledge from the set of natural language texts and their formal and logical presentation and application processing | [['this', 'paper', 'describes', 'the', 'design', 'principles', 'of', 'methodology', 'of', 'knowledgeoriented', 'information', 'systems', 'based', 'on', 'ontological', 'approach', 'such', 'systems', 'implement', 'technology', 'subjectoriented', 'extraction', 'of', 'knowledge', 'from', 'the', 'set', 'of', 'natural', 'language', 'texts', 'and', 'their', 'formal', 'and', 'logical', 'presentation', 'and', 'application', 'processing']] | [-0.07380590078537352, -0.06121499741566368, -0.07534455015993444, 0.04923040969006252, -0.1571105658542365, -0.11729337819851934, 0.08713031341612805, 0.33457124084234235, -0.29711776981130245, -0.35659439573064444, 0.09645428539952264, -0.24482198145415168, -0.22171000009402633, 0.23500751545652748, -0.12975868192734197, 0.08887937477556988, 0.07377177719026803, 0.05014413424069062, -0.04082673692610115, -0.15572243372444064, 0.374108258553315, 0.0008277117274701595, 0.3963802108541131, 0.029974312940612435, 0.15175708020105957, 0.03575780242681503, -0.12227395343361422, -0.08373806322924793, -0.0898165172431618, 0.28142406782135365, 0.3343555419705808, 0.3407290275092237, 0.2884485974092968, -0.4476487748324871, -0.14054665726143867, -0.019277163222432135, 0.08143266180995852, 0.14215751360170542, -0.012219400648609735, -0.3219513087067753, 0.04414468472241424, -0.24361928142025135, -0.014401129435282201, -0.129665285628289, 0.01945884325541556, -0.004103043302893639, -0.17556630572944415, -0.03653898648917675, 0.16923063297290356, 0.18754657021490856, -0.020788125623948873, -0.11169175532413647, 0.06922301133454312, 0.1584330374142155, -0.04162620840361342, -0.001169130313792266, 0.1924674015492201, -0.06431041154428385, -0.2026672713458538, 0.42912710439413787, 0.021600696753012016, -0.18928870814852417, 0.19719417989836074, -0.00961953634978272, -0.19038991018896922, 0.0041054502129554745, 0.22408752816263586, 0.06766416914761067, -0.2275100959232077, 0.0912295339818229, 0.05356782558374107, 0.207071588980034, 0.058791975333588195, 0.10170004351530224, 0.2418403533345554, 0.28519620773149656, -0.04260172483045608, 0.07881894577294588, 0.04810377758112736, -0.09037418686784804, -0.3099145812448114, -0.2051330389454961, -0.19904863550327717, 0.010048268636455759, -0.035006147703461464, -0.16851778919808566, 0.3709440904669464, 0.2726645071990788, 0.05526693807914853, 0.06662894616601989, 0.3541534140240401, 0.025800990147763513, 0.03826730194850825, 0.018655435799155386, 0.06638377527706325, 0.08913715856615453, 0.19852438691304997, -0.11904803795623593, 0.08040496974717826, 0.06608944623949356] |
1,802.0683 | Strong coupling between excitons in transition metal dichalcogenides and
optical bound states in the continuum | Being motivated by recent achievements in the rapidly developing fields of
optical bound states in the continuum (BICs) and excitons in monolayers of
transition metal dichalcogenides, we analyze strong coupling between BICs in
$\rm Ta_2O_5$ periodic photonic structures and excitons in $\rm WSe_2$
monolayers. We demonstrate that giant radiative lifetime of BICs allow to
engineer the exciton-polariton lifetime enhancing it three orders of magnitude
compared to a bare exciton. We show that maximal lifetime of hybrid
light-matter state can be achieved at any point of $\mathbf{k}$-space by
shaping the geometry of the photonic structure. Our findings open new route for
the realization of the moving exciton-polariton condensates with non-resonant
pump and without the Bragg mirrors which is of paramount importance for
polaritonic devices.
| cond-mat.mes-hall physics.optics | being motivated by recent achievements in the rapidly developing fields of optical bound states in the continuum bics and excitons in monolayers of transition metal dichalcogenides we analyze strong coupling between bics in rm ta_2o_5 periodic photonic structures and excitons in rm wse_2 monolayers we demonstrate that giant radiative lifetime of bics allow to engineer the excitonpolariton lifetime enhancing it three orders of magnitude compared to a bare exciton we show that maximal lifetime of hybrid lightmatter state can be achieved at any point of mathbfkspace by shaping the geometry of the photonic structure our findings open new route for the realization of the moving excitonpolariton condensates with nonresonant pump and without the bragg mirrors which is of paramount importance for polaritonic devices | [['being', 'motivated', 'by', 'recent', 'achievements', 'in', 'the', 'rapidly', 'developing', 'fields', 'of', 'optical', 'bound', 'states', 'in', 'the', 'continuum', 'bics', 'and', 'excitons', 'in', 'monolayers', 'of', 'transition', 'metal', 'dichalcogenides', 'we', 'analyze', 'strong', 'coupling', 'between', 'bics', 'in', 'rm', 'ta_2o_5', 'periodic', 'photonic', 'structures', 'and', 'excitons', 'in', 'rm', 'wse_2', 'monolayers', 'we', 'demonstrate', 'that', 'giant', 'radiative', 'lifetime', 'of', 'bics', 'allow', 'to', 'engineer', 'the', 'excitonpolariton', 'lifetime', 'enhancing', 'it', 'three', 'orders', 'of', 'magnitude', 'compared', 'to', 'a', 'bare', 'exciton', 'we', 'show', 'that', 'maximal', 'lifetime', 'of', 'hybrid', 'lightmatter', 'state', 'can', 'be', 'achieved', 'at', 'any', 'point', 'of', 'mathbfkspace', 'by', 'shaping', 'the', 'geometry', 'of', 'the', 'photonic', 'structure', 'our', 'findings', 'open', 'new', 'route', 'for', 'the', 'realization', 'of', 'the', 'moving', 'excitonpolariton', 'condensates', 'with', 'nonresonant', 'pump', 'and', 'without', 'the', 'bragg', 'mirrors', 'which', 'is', 'of', 'paramount', 'importance', 'for', 'polaritonic', 'devices']] | [-0.163878712591117, 0.2226087039003406, 0.0010337730447526991, -0.0005100355422071265, -0.0025351613502555747, -0.14049876872185102, 0.09030837901348317, 0.4629390386304235, -0.21235723838179818, -0.2796076902423084, -0.008084725691724902, -0.25716963929040887, -0.13738131301280687, 0.21623774659933476, 0.043839105965221316, 0.06103165678649656, 0.010009904058907575, -0.12953389873463145, -0.010501296952275968, -0.17299078779514668, 0.30133235510489553, -0.028969233113575757, 0.3318082474823284, 0.12967112364353445, 0.013441815603206434, -0.021001068742688353, 0.10362564562961868, -0.08413281379555299, -0.14070762600430298, 0.14421648983190563, 0.25793800828599833, -0.059897567614973564, 0.2447562594727681, -0.46851593375630013, -0.22014738158729852, 0.03926329687758296, 0.19383001187437676, 0.18915024469133346, -0.10005259757286043, -0.339070282195036, 0.04886342973137895, -0.13586532222902084, -0.1585521050746604, -0.07111328040444617, 0.010692805937695794, 0.002488027013009187, -0.21000187416093394, 0.029577527119497942, 0.04654845717548567, 0.012214066498587287, -0.0730553347683877, -0.07826846182451402, -0.07954967046739549, 0.04588260872259251, -0.020606409399618764, -0.012287185110939227, 0.15940244215525445, -0.1743414381488673, -0.1714011946488626, 0.38771580242953163, -0.1116749500284138, -0.07010317655522527, 0.16956037230509508, -0.15665015052034845, -0.01440037795289503, 0.15389077223807088, 0.15991795382167145, 0.1165985750049595, -0.0761874715426825, 0.05212693289537513, -0.014834303586796774, 0.1869370517885498, 0.10054679196025056, 0.20386485717963518, 0.2672068721754855, 0.22240971681487753, 0.03313791717031622, 0.14536009067518077, -0.05871101762205968, -0.06787432988393839, -0.21001129069676003, -0.19200932369160473, -0.20454934329491078, 0.10269522145996249, -0.05435540761414828, -0.14097748880418456, 0.40036248332040947, 0.11972550777112687, 0.16096022684217953, -0.04412482312323934, 0.26228336257693485, 0.11715347057575648, 0.09251199922395673, 0.023168465754819838, 0.33626643518493243, 0.18000999749713859, 0.05993995489931204, -0.27590196570987263, -0.01401192872080861, -0.013644998948036776] |
1,802.06831 | Comments on: "Lyapunov matrices for a class of time delay systems" by V.
L. Kharitonov | We prove that an auxiliary two-point boundary value problem presented in V.
L. Kharitonov, Lyapunov matrices for a class of time delay systems, Systems &
Control Letters 55 (2006) 610-617 has linearly dependent boundary conditions,
and consequently a unique solution does not exist. Therefore, the two-point
boundary value problem presented therein fails to be a basis for constructing
Lyapunov matrices for the class of time delay systems investigated.
| cs.SY math.OC | we prove that an auxiliary twopoint boundary value problem presented in v l kharitonov lyapunov matrices for a class of time delay systems systems control letters 55 2006 610617 has linearly dependent boundary conditions and consequently a unique solution does not exist therefore the twopoint boundary value problem presented therein fails to be a basis for constructing lyapunov matrices for the class of time delay systems investigated | [['we', 'prove', 'that', 'an', 'auxiliary', 'twopoint', 'boundary', 'value', 'problem', 'presented', 'in', 'v', 'l', 'kharitonov', 'lyapunov', 'matrices', 'for', 'a', 'class', 'of', 'time', 'delay', 'systems', 'systems', 'control', 'letters', '55', '2006', '610617', 'has', 'linearly', 'dependent', 'boundary', 'conditions', 'and', 'consequently', 'a', 'unique', 'solution', 'does', 'not', 'exist', 'therefore', 'the', 'twopoint', 'boundary', 'value', 'problem', 'presented', 'therein', 'fails', 'to', 'be', 'a', 'basis', 'for', 'constructing', 'lyapunov', 'matrices', 'for', 'the', 'class', 'of', 'time', 'delay', 'systems', 'investigated']] | [-0.23521709435788746, 0.07260786095183434, -0.06728147644775384, 0.04403109326394218, -0.06769333928329588, -0.18530219432784978, 0.03495850194612461, 0.3464203611242049, -0.2802769162244107, -0.21912364426746286, 0.16133528363725141, -0.21804357269976402, -0.14245843988927928, 0.204984994492296, -0.0639893478064826, 0.15829576973831563, 0.07832308408493797, 0.01940391184479901, -0.10437321189127749, -0.2470537029968744, 0.33571392593369115, -0.003287957332125216, 0.2488248779396103, 0.03243231838286826, 0.12213468913383126, 0.01406645296480168, -0.011954135811803017, 0.060843672285872424, -0.1363359239367128, 0.008134444417065066, 0.27275803932482656, 0.11858536630064588, 0.2989085399065957, -0.34336042186866206, -0.20994258813461233, 0.16098966470665552, 0.11808090776938832, 0.08142612223287649, -0.01792063589814599, -0.23580119995202756, 0.08607874257546483, -0.11352080316282809, -0.18686749273911119, -0.01854660130585685, 0.14109610540397238, -0.03567056625968579, -0.3439357903941224, 0.08848853060044348, 0.02192585596419645, 0.029790288553516748, -0.10262113228920057, -0.12719561225932205, -0.010897577253424308, 0.09552480931531383, -0.029024947999101696, 0.01703565706724696, 0.0874877513146423, -0.05807004620631536, -0.10832682222297246, 0.3261299556735056, -0.030874696433205496, -0.2608976988686305, 0.16677221225461725, -0.09736776514557388, -0.13527302353671103, 0.12352894287147193, 0.175988477682977, 0.14506631230081743, -0.20882842775829363, 0.13201122098711715, -0.0649274466047769, 0.22847619291507837, 0.07097066213574374, 0.039515546219649186, 0.11941943026966217, 0.06603317800027346, 0.180114401885393, 0.07394906170983714, 0.026888364400347753, -0.07565742276721832, -0.32231546639267245, -0.1526139827275818, -0.2091811957458655, 0.06396643658345882, -0.06680113131292412, -0.20109323503195561, 0.3771975227405853, 0.11416476734942108, 0.1765098575904796, 0.12593364261556417, 0.16814956060526046, 0.19393439292484385, 0.004565416299032442, 0.1246630483673829, 0.17543862568158092, 0.14906794849119967, 0.1442580180803568, -0.22413163344908477, 0.04008982232489595, 0.14574176740522185] |
1,802.06832 | Deep Learning for Joint Source-Channel Coding of Text | We consider the problem of joint source and channel coding of structured data
such as natural language over a noisy channel. The typical approach to this
problem in both theory and practice involves performing source coding to first
compress the text and then channel coding to add robustness for the
transmission across the channel. This approach is optimal in terms of
minimizing end-to-end distortion with arbitrarily large block lengths of both
the source and channel codes when transmission is over discrete memoryless
channels. However, the optimality of this approach is no longer ensured for
documents of finite length and limitations on the length of the encoding. We
will show in this scenario that we can achieve lower word error rates by
developing a deep learning based encoder and decoder. While the approach of
separate source and channel coding would minimize bit error rates, our approach
preserves semantic information of sentences by first embedding sentences in a
semantic space where sentences closer in meaning are located closer together,
and then performing joint source and channel coding on these embeddings.
| cs.IT cs.AI cs.LG math.IT | we consider the problem of joint source and channel coding of structured data such as natural language over a noisy channel the typical approach to this problem in both theory and practice involves performing source coding to first compress the text and then channel coding to add robustness for the transmission across the channel this approach is optimal in terms of minimizing endtoend distortion with arbitrarily large block lengths of both the source and channel codes when transmission is over discrete memoryless channels however the optimality of this approach is no longer ensured for documents of finite length and limitations on the length of the encoding we will show in this scenario that we can achieve lower word error rates by developing a deep learning based encoder and decoder while the approach of separate source and channel coding would minimize bit error rates our approach preserves semantic information of sentences by first embedding sentences in a semantic space where sentences closer in meaning are located closer together and then performing joint source and channel coding on these embeddings | [['we', 'consider', 'the', 'problem', 'of', 'joint', 'source', 'and', 'channel', 'coding', 'of', 'structured', 'data', 'such', 'as', 'natural', 'language', 'over', 'a', 'noisy', 'channel', 'the', 'typical', 'approach', 'to', 'this', 'problem', 'in', 'both', 'theory', 'and', 'practice', 'involves', 'performing', 'source', 'coding', 'to', 'first', 'compress', 'the', 'text', 'and', 'then', 'channel', 'coding', 'to', 'add', 'robustness', 'for', 'the', 'transmission', 'across', 'the', 'channel', 'this', 'approach', 'is', 'optimal', 'in', 'terms', 'of', 'minimizing', 'endtoend', 'distortion', 'with', 'arbitrarily', 'large', 'block', 'lengths', 'of', 'both', 'the', 'source', 'and', 'channel', 'codes', 'when', 'transmission', 'is', 'over', 'discrete', 'memoryless', 'channels', 'however', 'the', 'optimality', 'of', 'this', 'approach', 'is', 'no', 'longer', 'ensured', 'for', 'documents', 'of', 'finite', 'length', 'and', 'limitations', 'on', 'the', 'length', 'of', 'the', 'encoding', 'we', 'will', 'show', 'in', 'this', 'scenario', 'that', 'we', 'can', 'achieve', 'lower', 'word', 'error', 'rates', 'by', 'developing', 'a', 'deep', 'learning', 'based', 'encoder', 'and', 'decoder', 'while', 'the', 'approach', 'of', 'separate', 'source', 'and', 'channel', 'coding', 'would', 'minimize', 'bit', 'error', 'rates', 'our', 'approach', 'preserves', 'semantic', 'information', 'of', 'sentences', 'by', 'first', 'embedding', 'sentences', 'in', 'a', 'semantic', 'space', 'where', 'sentences', 'closer', 'in', 'meaning', 'are', 'located', 'closer', 'together', 'and', 'then', 'performing', 'joint', 'source', 'and', 'channel', 'coding', 'on', 'these', 'embeddings']] | [-0.12821526339622946, 0.027018766340098522, -0.05567244794272054, 0.08041828349062628, -0.059675158939345246, -0.21001879959053288, 0.11935861936111129, 0.4420085319035341, -0.3416184953706904, -0.27432651974763095, 0.1034475153729351, -0.25372634824166557, -0.12169117670443454, 0.17219352848262767, -0.13434267589813256, 0.0876963346532096, 0.08381022539629412, 0.08996984477840322, -0.0783468273800557, -0.2676833508172585, 0.3152661259165766, 0.0904223327523325, 0.3336551261887875, 0.02742694205018493, 0.13287903769582698, 0.02232112193197598, -0.06383253287346091, -0.06703612870445835, -0.0740703370259356, 0.14810041727869655, 0.33675361439334545, 0.19717884810871622, 0.2730629461283764, -0.40052350331621056, -0.26668731750020486, 0.05116829228014528, 0.17254660488269816, 0.15109248910219608, -0.011284426893264558, -0.2938433610180163, 0.14451019746235708, -0.15537061309441924, 0.08560762304310383, 0.003308985633461663, -0.0223813961270485, -0.011645079329753755, -0.3098596202809981, 0.061339541717714975, 0.0917427282717623, 0.031560550365345864, -0.049824770440588174, -0.09587569147337939, 0.057445054971926916, 0.1872238382506459, 0.042317621569473586, 0.07666784373381479, 0.06641563850329414, -0.12096662750844372, -0.10837485747453704, 0.34561045997347056, -0.05195913451469995, -0.2514859555221131, 0.11976593253863295, -0.06027572341734188, -0.09312087886841193, 0.13462703517086155, 0.23561154481735122, 0.07686792245773033, -0.1577518864923446, 0.0300182278926636, -0.0340060835725136, 0.2383299070106966, 0.09703389581114974, 0.11567392393101655, 0.16362453561297127, 0.19156399211621308, 0.06030291432431072, 0.1866560241539722, -0.13139793378094294, -0.09728922777589452, -0.2840646956105497, -0.11580953275486618, -0.20235753829036368, -0.039475270361231454, -0.11774117065771167, -0.10695530179092723, 0.3461971300565167, 0.1649239869406342, 0.1631666949264747, 0.14593231788521838, 0.34519697790128295, 0.038935303746910996, 0.058281552098858894, 0.1476122216004983, 0.13859418915778274, 0.09599857933798366, 0.06046245054844139, -0.1699967172913766, 0.09147696704420606, 0.03672392336191254] |
1,802.06833 | Seasonal Web Search Query Selection for Influenza-Like Illness (ILI)
Estimation | Influenza-like illness (ILI) estimation from web search data is an important
web analytics task. The basic idea is to use the frequencies of queries in web
search logs that are correlated with past ILI activity as features when
estimating current ILI activity. It has been noted that since influenza is
seasonal, this approach can lead to spurious correlations with features/queries
that also exhibit seasonality, but have no relationship with ILI. Spurious
correlations can, in turn, degrade performance. To address this issue, we
propose modeling the seasonal variation in ILI activity and selecting queries
that are correlated with the residual of the seasonal model and the observed
ILI signal. Experimental results show that re-ranking queries obtained by
Google Correlate based on their correlation with the residual strongly favours
ILI-related queries.
| cs.IR | influenzalike illness ili estimation from web search data is an important web analytics task the basic idea is to use the frequencies of queries in web search logs that are correlated with past ili activity as features when estimating current ili activity it has been noted that since influenza is seasonal this approach can lead to spurious correlations with featuresqueries that also exhibit seasonality but have no relationship with ili spurious correlations can in turn degrade performance to address this issue we propose modeling the seasonal variation in ili activity and selecting queries that are correlated with the residual of the seasonal model and the observed ili signal experimental results show that reranking queries obtained by google correlate based on their correlation with the residual strongly favours ilirelated queries | [['influenzalike', 'illness', 'ili', 'estimation', 'from', 'web', 'search', 'data', 'is', 'an', 'important', 'web', 'analytics', 'task', 'the', 'basic', 'idea', 'is', 'to', 'use', 'the', 'frequencies', 'of', 'queries', 'in', 'web', 'search', 'logs', 'that', 'are', 'correlated', 'with', 'past', 'ili', 'activity', 'as', 'features', 'when', 'estimating', 'current', 'ili', 'activity', 'it', 'has', 'been', 'noted', 'that', 'since', 'influenza', 'is', 'seasonal', 'this', 'approach', 'can', 'lead', 'to', 'spurious', 'correlations', 'with', 'featuresqueries', 'that', 'also', 'exhibit', 'seasonality', 'but', 'have', 'no', 'relationship', 'with', 'ili', 'spurious', 'correlations', 'can', 'in', 'turn', 'degrade', 'performance', 'to', 'address', 'this', 'issue', 'we', 'propose', 'modeling', 'the', 'seasonal', 'variation', 'in', 'ili', 'activity', 'and', 'selecting', 'queries', 'that', 'are', 'correlated', 'with', 'the', 'residual', 'of', 'the', 'seasonal', 'model', 'and', 'the', 'observed', 'ili', 'signal', 'experimental', 'results', 'show', 'that', 'reranking', 'queries', 'obtained', 'by', 'google', 'correlate', 'based', 'on', 'their', 'correlation', 'with', 'the', 'residual', 'strongly', 'favours', 'ilirelated', 'queries']] | [-0.08106979819593996, 0.09920508033647771, -0.06559832066326864, 0.11865024191261393, -0.092969418826007, -0.14952947545473969, 0.055015069381223886, 0.43575233309053063, -0.2374126462441847, -0.3652377161160698, 0.10573699021634947, -0.36723001746600126, -0.213625306380898, 0.17096296713071488, -0.1102981930965279, -0.000995015593494956, 0.09299292044134766, 0.027426331854007377, -0.02871668457665928, -0.29683058517325056, 0.24929396359169284, 0.11385102084045863, 0.30615059959548196, 0.058751941931719974, 0.01183749235319487, -0.006300227619399588, -0.12386750765364822, 0.006380851510692183, -0.038538996962150726, 0.10914988984815835, 0.31870820471562267, 0.21057959776701712, 0.2695683639415899, -0.4000746191453599, -0.2494140503502737, 0.11598539280734486, 0.14061997778801702, 0.08210096896995468, -0.036659825817813844, -0.3131815039316537, 0.05690615584223172, -0.15862915144983944, -0.008838468823420603, -0.10956184967149665, 0.04130534152317, 0.03331368715744319, -0.2677223313761156, 0.13491733875432727, 0.02652036051053231, 0.10397814985687338, -0.027496482729618476, -0.07686543008165918, -0.017862473915177066, 0.16814139740120831, 0.1325356540037319, 0.05487620218942954, 0.14117194213134449, -0.10073241959582632, -0.16248769231652108, 0.33183411303467636, -0.06692908445417177, -0.12503127038742848, 0.1678564810986066, -0.11522036025164957, -0.15762415854260325, 0.13682943858264937, 0.21037021044671067, 0.018644444802115988, -0.18152339861594877, -0.017403828404572476, -0.04107675649680373, 0.23137666266704873, 0.03747473262235757, 0.024021887600854566, 0.21533513962525844, 0.18161823580914185, 0.04455781723445971, 0.08735963703210164, -0.14400302114397814, -0.056911306420898464, -0.1580712611193028, -0.04942451015584112, -0.11961375421103765, -0.037045362671309215, -0.08968248476772056, -0.18677476936525952, 0.394579376292041, 0.27531838606251036, 0.1962888596898429, 0.05907754172703002, 0.2876099752863561, 0.07062419536101859, 0.10552713433720583, 0.09039594284414615, 0.1795583462019957, -0.019915945041470054, 0.14909271063928412, -0.22189202071094197, 0.2198157720341105, -0.02277430130616124] |
1,802.06834 | Spin current and spin transfer torque in ferromagnet/superconductor spin
valves | Using fully self consistent methods, we study spin transport in realistic,
fabricable experimental spin valve systems consisting of two magnetic layers, a
superconducting layer, and a spacer normal layer between the ferromagnets. Our
methods ensure that the proper relations between spin current gradients and
spin transfer torques are satisfied. We present results as a function of
geometrical parameters, interfacial barrier values, misalignment angle between
the ferromagnets, and bias voltage. Our main results are for the spin current
and spin accumulation as functions of position within the spin valve structure.
We see precession of the spin current about the exchange fields within the
ferromagnets, and penetration of the spin current into the superconductor for
biases greater than the critical bias, defined in the text. The spin
accumulation exhibits oscillating behavior in the normal metal, with a strong
dependence on the physical parameters both as to the structure and formation of
the peaks. We also study the bias dependence of the spatially averaged spin
transfer torque and spin accumulation. We examine the critical bias effect of
these quantities, and their dependence on the physical parameters. Our results
are predictive of the outcome of future experiments, as they take into account
imperfect interfaces and a realistic geometry.
| cond-mat.supr-con | using fully self consistent methods we study spin transport in realistic fabricable experimental spin valve systems consisting of two magnetic layers a superconducting layer and a spacer normal layer between the ferromagnets our methods ensure that the proper relations between spin current gradients and spin transfer torques are satisfied we present results as a function of geometrical parameters interfacial barrier values misalignment angle between the ferromagnets and bias voltage our main results are for the spin current and spin accumulation as functions of position within the spin valve structure we see precession of the spin current about the exchange fields within the ferromagnets and penetration of the spin current into the superconductor for biases greater than the critical bias defined in the text the spin accumulation exhibits oscillating behavior in the normal metal with a strong dependence on the physical parameters both as to the structure and formation of the peaks we also study the bias dependence of the spatially averaged spin transfer torque and spin accumulation we examine the critical bias effect of these quantities and their dependence on the physical parameters our results are predictive of the outcome of future experiments as they take into account imperfect interfaces and a realistic geometry | [['using', 'fully', 'self', 'consistent', 'methods', 'we', 'study', 'spin', 'transport', 'in', 'realistic', 'fabricable', 'experimental', 'spin', 'valve', 'systems', 'consisting', 'of', 'two', 'magnetic', 'layers', 'a', 'superconducting', 'layer', 'and', 'a', 'spacer', 'normal', 'layer', 'between', 'the', 'ferromagnets', 'our', 'methods', 'ensure', 'that', 'the', 'proper', 'relations', 'between', 'spin', 'current', 'gradients', 'and', 'spin', 'transfer', 'torques', 'are', 'satisfied', 'we', 'present', 'results', 'as', 'a', 'function', 'of', 'geometrical', 'parameters', 'interfacial', 'barrier', 'values', 'misalignment', 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1,802.06835 | Bregman Parallel Direction Method of Multipliers for Distributed
Optimization via Mirror Averaging | Distributed optimization aims to optimize a global objective formed by a sum
of coupled local convex functions over a graph via only local computation and
communication. In this paper, we propose the Bregman parallel direction method
of multipliers (PDMM) based on a generalized averaging step named mirror
averaging. We establish the global convergence and $O(1/T)$ convergence rate of
the Bregman PDMM, along with its $O(n/\ln n)$ improvement over existing PDMM,
where $T$ denotes the number of iterations and $n$ the dimension of solution
variable. In addition, we can enhance its performance by optimizing the
spectral gap of the averaging matrix. We demonstrate our results via a
numerical example.
| math.OC | distributed optimization aims to optimize a global objective formed by a sum of coupled local convex functions over a graph via only local computation and communication in this paper we propose the bregman parallel direction method of multipliers pdmm based on a generalized averaging step named mirror averaging we establish the global convergence and o1t convergence rate of the bregman pdmm along with its onln n improvement over existing pdmm where t denotes the number of iterations and n the dimension of solution variable in addition we can enhance its performance by optimizing the spectral gap of the averaging matrix we demonstrate our results via a numerical example | [['distributed', 'optimization', 'aims', 'to', 'optimize', 'a', 'global', 'objective', 'formed', 'by', 'a', 'sum', 'of', 'coupled', 'local', 'convex', 'functions', 'over', 'a', 'graph', 'via', 'only', 'local', 'computation', 'and', 'communication', 'in', 'this', 'paper', 'we', 'propose', 'the', 'bregman', 'parallel', 'direction', 'method', 'of', 'multipliers', 'pdmm', 'based', 'on', 'a', 'generalized', 'averaging', 'step', 'named', 'mirror', 'averaging', 'we', 'establish', 'the', 'global', 'convergence', 'and', 'o1t', 'convergence', 'rate', 'of', 'the', 'bregman', 'pdmm', 'along', 'with', 'its', 'onln', 'n', 'improvement', 'over', 'existing', 'pdmm', 'where', 't', 'denotes', 'the', 'number', 'of', 'iterations', 'and', 'n', 'the', 'dimension', 'of', 'solution', 'variable', 'in', 'addition', 'we', 'can', 'enhance', 'its', 'performance', 'by', 'optimizing', 'the', 'spectral', 'gap', 'of', 'the', 'averaging', 'matrix', 'we', 'demonstrate', 'our', 'results', 'via', 'a', 'numerical', 'example']] | [-0.15720877266075048, -0.0003284172497741464, -0.08665288190564348, 0.0011455925920960941, -0.048562631265398254, -0.11281842320588314, 0.09122996578204308, 0.3962694326225944, -0.3455428441951948, -0.2712581823924901, 0.11237421422049886, -0.22491379468098144, -0.14394434263144998, 0.14935882882585888, -0.08000302504876379, 0.09602946180018114, 0.06936300941742957, 0.03483832210164379, -0.14119253148911176, -0.31451788887568033, 0.2663277071928692, 0.04012513692227744, 0.2751254024786047, 0.013910533889968603, 0.14104141926940497, 0.06259037842715366, -0.031395885580288316, 0.033340207378690444, -0.10622572869114164, 0.17020714024073202, 0.22275590079974522, 0.15802456965212952, 0.35622691332052153, -0.392804445649273, -0.15164442138780873, 0.1387629114712278, 0.21388502173229224, 0.023540070487393275, -0.05515601810313658, -0.2318434023850218, 0.1088431115053094, -0.13627127746844458, -0.060243953605768855, -0.09357125069557999, -0.08467003848205355, 0.08471886379023393, -0.3470602450866459, 0.05045495737027118, 0.06579790657593144, 0.03879336035310256, -0.021636562296879238, -0.11953252160714732, 0.044980933344319324, 0.05207514020730741, 0.05406558191990135, 0.06701328483392933, 0.13337268594100518, -0.04610517848050222, -0.12596996427789606, 0.3151654791716417, -0.11719893577349096, -0.23004503826248562, 0.1281714087952558, -0.06099399713006009, -0.09386046294605842, 0.10870052672301729, 0.2058480295990766, 0.20699316111427765, -0.12150172142881072, 0.11285519764027817, -0.05201567876739083, 0.1264145178720355, 0.05272867711674836, 0.021232393371907098, 0.07730683006984354, 0.16720722832589538, 0.20644080452620983, 0.1785984412150962, -0.08328537318501966, -0.12729519470681058, -0.3117562480857251, -0.16708534900788907, -0.22631034491307758, 0.011473962524043466, -0.1485812870686695, -0.10787428594711754, 0.4411788173192353, 0.12578559320644234, 0.21285607122505704, 0.1377065182249579, 0.31520368348531147, 0.10960802693389943, 0.05848580446197755, 0.14149917491401234, 0.18993201296392795, 0.14074858899995754, 0.0720759198841363, -0.27089691874829847, 0.044641430220239, 0.16459409699395852] |
1,802.06836 | Motivic Euler products and motivic height zeta functions | A motivic height zeta function associated to a family of varieties
parametrised by a curve is the generating series of the classes, in the
Grothendieck ring of varieties, of moduli spaces of sections of this family
with varying degrees. This text is devoted to the study of the motivic height
zeta function associated to a family of varieties with generic fiber having the
structure of an equivariant compactification of a vector group. Our main
theorem describes the convergence of this motivic height zeta function with
respect to a topology on the Grothendieck ring of varieties coming from the
theory of weights in cohomology. We deduce from it the asymptotic behaviour, as
the degree goes to infinity, of a positive proportion of the coefficients of
the Hodge-Deligne polynomial of the above moduli spaces: in particular, we get
an estimate for their dimension and the number of components of maximal
dimension. The main tools for this are a notion of motivic Euler product for
series with coefficients in the Grothendieck ring of varieties, an extension of
Hrushovski and Kazhdan's motivic Poisson summation formula, and a motivic
measure on the Grothendieck ring of varieties with exponentials constructed
using Denef and Loeser's motivic vanishing cycles.
| math.AG | a motivic height zeta function associated to a family of varieties parametrised by a curve is the generating series of the classes in the grothendieck ring of varieties of moduli spaces of sections of this family with varying degrees this text is devoted to the study of the motivic height zeta function associated to a family of varieties with generic fiber having the structure of an equivariant compactification of a vector group our main theorem describes the convergence of this motivic height zeta function with respect to a topology on the grothendieck ring of varieties coming from the theory of weights in cohomology we deduce from it the asymptotic behaviour as the degree goes to infinity of a positive proportion of the coefficients of the hodgedeligne polynomial of the above moduli spaces in particular we get an estimate for their dimension and the number of components of maximal dimension the main tools for this are a notion of motivic euler product for series with coefficients in the grothendieck ring of varieties an extension of hrushovski and kazhdans motivic poisson summation formula and a motivic measure on the grothendieck ring of varieties with exponentials constructed using denef and loesers motivic vanishing cycles | [['a', 'motivic', 'height', 'zeta', 'function', 'associated', 'to', 'a', 'family', 'of', 'varieties', 'parametrised', 'by', 'a', 'curve', 'is', 'the', 'generating', 'series', 'of', 'the', 'classes', 'in', 'the', 'grothendieck', 'ring', 'of', 'varieties', 'of', 'moduli', 'spaces', 'of', 'sections', 'of', 'this', 'family', 'with', 'varying', 'degrees', 'this', 'text', 'is', 'devoted', 'to', 'the', 'study', 'of', 'the', 'motivic', 'height', 'zeta', 'function', 'associated', 'to', 'a', 'family', 'of', 'varieties', 'with', 'generic', 'fiber', 'having', 'the', 'structure', 'of', 'an', 'equivariant', 'compactification', 'of', 'a', 'vector', 'group', 'our', 'main', 'theorem', 'describes', 'the', 'convergence', 'of', 'this', 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1,802.06837 | Accurate Contact Localization and Indentation Depth Prediction With an
Optics-based Tactile Sensor | Traditional methods to achieve high localization accuracy with tactile
sensors usually use a matrix of miniaturized individual sensors distributed on
the area of interest. This approach usually comes at a price of increased
complexity in fabrication and circuitry, and can be hard to adapt for non
planar geometries. We propose to use low cost optic components mounted on the
edges of the sensing area to measure how light traveling through an elastomer
is affected by touch. Multiple light emitters and receivers provide us with a
rich signal set that contains the necessary information to pinpoint both the
location and depth of an indentation with high accuracy. We demonstrate
sub-millimeter accuracy on location and depth on a 20mm by 20mm active sensing
area. Our sensor provides high depth sensitivity as a result of two different
modalities in how light is guided through our elastomer. This method results in
a low cost, easy to manufacture sensor. We believe this approach can be adapted
to cover non-planar surfaces, simplifying future integration in robot skin
applications.
| cs.RO | traditional methods to achieve high localization accuracy with tactile sensors usually use a matrix of miniaturized individual sensors distributed on the area of interest this approach usually comes at a price of increased complexity in fabrication and circuitry and can be hard to adapt for non planar geometries we propose to use low cost optic components mounted on the edges of the sensing area to measure how light traveling through an elastomer is affected by touch multiple light emitters and receivers provide us with a rich signal set that contains the necessary information to pinpoint both the location and depth of an indentation with high accuracy we demonstrate submillimeter accuracy on location and depth on a 20mm by 20mm active sensing area our sensor provides high depth sensitivity as a result of two different modalities in how light is guided through our elastomer this method results in a low cost easy to manufacture sensor we believe this approach can be adapted to cover nonplanar surfaces simplifying future integration in robot skin applications | [['traditional', 'methods', 'to', 'achieve', 'high', 'localization', 'accuracy', 'with', 'tactile', 'sensors', 'usually', 'use', 'a', 'matrix', 'of', 'miniaturized', 'individual', 'sensors', 'distributed', 'on', 'the', 'area', 'of', 'interest', 'this', 'approach', 'usually', 'comes', 'at', 'a', 'price', 'of', 'increased', 'complexity', 'in', 'fabrication', 'and', 'circuitry', 'and', 'can', 'be', 'hard', 'to', 'adapt', 'for', 'non', 'planar', 'geometries', 'we', 'propose', 'to', 'use', 'low', 'cost', 'optic', 'components', 'mounted', 'on', 'the', 'edges', 'of', 'the', 'sensing', 'area', 'to', 'measure', 'how', 'light', 'traveling', 'through', 'an', 'elastomer', 'is', 'affected', 'by', 'touch', 'multiple', 'light', 'emitters', 'and', 'receivers', 'provide', 'us', 'with', 'a', 'rich', 'signal', 'set', 'that', 'contains', 'the', 'necessary', 'information', 'to', 'pinpoint', 'both', 'the', 'location', 'and', 'depth', 'of', 'an', 'indentation', 'with', 'high', 'accuracy', 'we', 'demonstrate', 'submillimeter', 'accuracy', 'on', 'location', 'and', 'depth', 'on', 'a', '20mm', 'by', '20mm', 'active', 'sensing', 'area', 'our', 'sensor', 'provides', 'high', 'depth', 'sensitivity', 'as', 'a', 'result', 'of', 'two', 'different', 'modalities', 'in', 'how', 'light', 'is', 'guided', 'through', 'our', 'elastomer', 'this', 'method', 'results', 'in', 'a', 'low', 'cost', 'easy', 'to', 'manufacture', 'sensor', 'we', 'believe', 'this', 'approach', 'can', 'be', 'adapted', 'to', 'cover', 'nonplanar', 'surfaces', 'simplifying', 'future', 'integration', 'in', 'robot', 'skin', 'applications']] | [-0.08816096088903155, 0.07855078631042108, -0.05738246212659274, -0.03586394307108834, -0.1115960840455278, -0.17985673248429437, 0.049831085790999145, 0.4722125303693289, -0.25415938316172987, -0.35112020799749377, 0.119893919219003, -0.2869299784069881, -0.15978321796932884, 0.21958250896788614, -0.17146268395198033, 0.07636456399462944, 0.06419406128576198, -0.003193501391018968, -0.009950972861355864, -0.21864878136169186, 0.21367200838908185, 0.0716306582498662, 0.32181428882380037, 0.08573511393394234, 0.1394217346475438, 0.038851305368616314, 0.010028518833826447, 0.034958882782564954, -0.08897282622980805, 0.18247552844831114, 0.30692394860738587, 0.11263676982936124, 0.2514578590851797, -0.46074499342547254, -0.218568287264599, 0.05032789320305943, 0.11787812576390976, 0.07354294712016315, -0.05284873472234278, -0.27170446674274495, 0.07690169187878572, -0.12263866645543901, -0.12963762470428983, -0.06474792873784684, -0.02721089375107874, 0.014873801394863877, -0.2339102742492308, -0.006252740796785368, -0.030477969066597263, 0.06650572219798558, -0.036736349304488235, -0.0691606856538741, 0.040877420597352346, 0.1605241482882479, -0.023951130560436826, 0.017581688716999513, 0.20478835513782795, -0.15374465602389834, -0.08886947479575526, 0.3462673055961035, -0.030200384231013528, -0.20997512378448316, 0.2147587982607399, -0.11283935031983568, -0.09050647826150579, 0.1682557095854738, 0.2389367350788657, 0.10519457085404632, -0.13397918108222617, 0.017018738445056993, 0.048563802593149415, 0.21642663781152127, 0.08316972734796446, 0.041220253411962025, 0.211564781507044, 0.2321847508076665, 0.11448168286306311, 0.16445506657582037, -0.1507903755734523, 0.01745502303928397, -0.24226064584522541, -0.14297682833235148, -0.19814282801911928, 0.014370899087733178, -0.11671164725068889, -0.1466786512227859, 0.3569378236546939, 0.20261856198289194, 0.20453319466282982, 0.05439901291825917, 0.37765731972772193, 0.042679433118051786, 0.10145411447169757, 0.02704074871888774, 0.2525719582687977, 0.07329528301488608, 0.12566588752697286, -0.17329875892840413, 0.04240382145440509, -0.011496302472741539] |
1,802.06838 | Cocycles in Local Higher Category Theory | We develop a model structure on presheaves of small simplicially enriched
categories on a site $\mathscr{C}$, for which the weak equivalences are
'stalkwise' weak equivalences for the Bergner model structure. This model
structure is right proper, and can be connected via a zig-zag of Quillen
equivalences to local analogues of the Joyal and Rezk model structures.
Because the local Bergner model structure is right proper, we can apply
Jardine's cocycle categories to study its homotopy category. As an application
of the cocycle theory, we describe the maps $[*, X]$ in the homotopy category
of the Jardine model structure as the path components of a category of torsors,
where $X$ is a presheaf of Kan complexes. In the case where $X$ is obtained by
applying the nerve construction sectionwise to a sheaf of groups, this
description recovers classical non-abelian $H^{1}$.
| math.CT | we develop a model structure on presheaves of small simplicially enriched categories on a site mathscrc for which the weak equivalences are stalkwise weak equivalences for the bergner model structure this model structure is right proper and can be connected via a zigzag of quillen equivalences to local analogues of the joyal and rezk model structures because the local bergner model structure is right proper we can apply jardines cocycle categories to study its homotopy category as an application of the cocycle theory we describe the maps x in the homotopy category of the jardine model structure as the path components of a category of torsors where x is a presheaf of kan complexes in the case where x is obtained by applying the nerve construction sectionwise to a sheaf of groups this description recovers classical nonabelian h1 | [['we', 'develop', 'a', 'model', 'structure', 'on', 'presheaves', 'of', 'small', 'simplicially', 'enriched', 'categories', 'on', 'a', 'site', 'mathscrc', 'for', 'which', 'the', 'weak', 'equivalences', 'are', 'stalkwise', 'weak', 'equivalences', 'for', 'the', 'bergner', 'model', 'structure', 'this', 'model', 'structure', 'is', 'right', 'proper', 'and', 'can', 'be', 'connected', 'via', 'a', 'zigzag', 'of', 'quillen', 'equivalences', 'to', 'local', 'analogues', 'of', 'the', 'joyal', 'and', 'rezk', 'model', 'structures', 'because', 'the', 'local', 'bergner', 'model', 'structure', 'is', 'right', 'proper', 'we', 'can', 'apply', 'jardines', 'cocycle', 'categories', 'to', 'study', 'its', 'homotopy', 'category', 'as', 'an', 'application', 'of', 'the', 'cocycle', 'theory', 'we', 'describe', 'the', 'maps', 'x', 'in', 'the', 'homotopy', 'category', 'of', 'the', 'jardine', 'model', 'structure', 'as', 'the', 'path', 'components', 'of', 'a', 'category', 'of', 'torsors', 'where', 'x', 'is', 'a', 'presheaf', 'of', 'kan', 'complexes', 'in', 'the', 'case', 'where', 'x', 'is', 'obtained', 'by', 'applying', 'the', 'nerve', 'construction', 'sectionwise', 'to', 'a', 'sheaf', 'of', 'groups', 'this', 'description', 'recovers', 'classical', 'nonabelian', 'h1']] | [-0.14479556077704353, 0.022383778832911903, -0.08343263400499434, 0.12981781252036692, -0.08223384432623039, -0.11862335020936478, -0.009991748094976442, 0.407905408879742, -0.42124319709631997, -0.18212636809124993, 0.0695370272399433, -0.18881011842613055, -0.1254322288064834, 0.13129946402862996, -0.16824162079651347, -0.11315467310701291, 0.05480916953563471, 0.09565551945193232, -0.03510078340717454, -0.21044281935439144, 0.4073595680700451, 0.018847089151249212, 0.25964137567071327, 0.010759443161077797, 0.11078542177839314, -0.017220403952866465, 0.032925227259778804, 0.03711004839758115, -0.13923954093393953, 0.17370817346690112, 0.26543629012988224, 0.04120141299705103, 0.17567242579003933, -0.36742158051963675, -0.12751971153685351, 0.12525524846825967, 0.06765119140276082, 0.06511697032307412, 0.01609583749771392, -0.36688888301518197, 0.14911056694108993, -0.2194975614650449, -0.07309639439336024, -0.08747803605750532, 0.05184419242911698, 0.028691643915782848, -0.25318060263089137, -0.022764781729646903, 0.09561667607083697, 0.08979786189464743, -0.10157416272405125, -0.00884346999501919, -0.12159289371715311, 0.1246420418679276, -0.047175475884133074, 0.045113935428055224, 0.15738617370644695, -0.12843009542591652, -0.12481107780374312, 0.3967272371348158, -0.07635741787003901, -0.18244159469374127, 0.1542667577673188, -0.11382095305966419, -0.18498222689788021, 0.11378093720208306, 0.007258623671505655, 0.1674001106122673, -0.06500094111962586, 0.2344328666727319, -0.15095845556146847, 0.10134361581602956, 0.05907262223669985, -0.00559016247279942, 0.12738798466248494, 0.1800680789849995, 0.05490850559079477, 0.12422627613876316, -0.014858626301729065, -0.047223394572296566, -0.3401574268663192, -0.16700129034121775, -0.033503118285272436, 0.12764346787405564, -0.07851324314127422, -0.20370201311957584, 0.40296615333542884, 0.11467052562126329, 0.22278749919496477, 0.11822199766774087, 0.23347469670561088, 0.0009594549996750977, 0.05326259669827243, -0.038356252528234, 0.1365410392806071, 0.27995281313333714, -0.02868617467003573, -0.04462660779929994, 0.02388442458708168, 0.26788255329730043] |
1,802.06839 | Human-in-the-Loop Mixed-Initiative Control under Temporal Tasks | This paper considers the motion control and task planning problem of mobile
robots under complex high-level tasks and human initiatives. The assigned task
is specified as Linear Temporal Logic (LTL) formulas that consist of hard and
soft constraints. The human initiative influences the robot autonomy in two
explicit ways: with additive terms in the continuous controller and with
contingent task assignments. We propose an online coordination scheme that
encapsulates (i) a mixed-initiative continuous controller that ensures all-time
safety despite of possible human errors, (ii) a plan adaptation scheme that
accommodates new features discovered in the workspace and short-term tasks
assigned by the operator during run time, and (iii) an iterative inverse
reinforcement learning (IRL) algorithm that allows the robot to asymptotically
learn the human preference on the parameters during the plan synthesis. The
results are demonstrated by both realistic human-in-the-loop simulations and
experiments.
| cs.RO | this paper considers the motion control and task planning problem of mobile robots under complex highlevel tasks and human initiatives the assigned task is specified as linear temporal logic ltl formulas that consist of hard and soft constraints the human initiative influences the robot autonomy in two explicit ways with additive terms in the continuous controller and with contingent task assignments we propose an online coordination scheme that encapsulates i a mixedinitiative continuous controller that ensures alltime safety despite of possible human errors ii a plan adaptation scheme that accommodates new features discovered in the workspace and shortterm tasks assigned by the operator during run time and iii an iterative inverse reinforcement learning irl algorithm that allows the robot to asymptotically learn the human preference on the parameters during the plan synthesis the results are demonstrated by both realistic humanintheloop simulations and experiments | [['this', 'paper', 'considers', 'the', 'motion', 'control', 'and', 'task', 'planning', 'problem', 'of', 'mobile', 'robots', 'under', 'complex', 'highlevel', 'tasks', 'and', 'human', 'initiatives', 'the', 'assigned', 'task', 'is', 'specified', 'as', 'linear', 'temporal', 'logic', 'ltl', 'formulas', 'that', 'consist', 'of', 'hard', 'and', 'soft', 'constraints', 'the', 'human', 'initiative', 'influences', 'the', 'robot', 'autonomy', 'in', 'two', 'explicit', 'ways', 'with', 'additive', 'terms', 'in', 'the', 'continuous', 'controller', 'and', 'with', 'contingent', 'task', 'assignments', 'we', 'propose', 'an', 'online', 'coordination', 'scheme', 'that', 'encapsulates', 'i', 'a', 'mixedinitiative', 'continuous', 'controller', 'that', 'ensures', 'alltime', 'safety', 'despite', 'of', 'possible', 'human', 'errors', 'ii', 'a', 'plan', 'adaptation', 'scheme', 'that', 'accommodates', 'new', 'features', 'discovered', 'in', 'the', 'workspace', 'and', 'shortterm', 'tasks', 'assigned', 'by', 'the', 'operator', 'during', 'run', 'time', 'and', 'iii', 'an', 'iterative', 'inverse', 'reinforcement', 'learning', 'irl', 'algorithm', 'that', 'allows', 'the', 'robot', 'to', 'asymptotically', 'learn', 'the', 'human', 'preference', 'on', 'the', 'parameters', 'during', 'the', 'plan', 'synthesis', 'the', 'results', 'are', 'demonstrated', 'by', 'both', 'realistic', 'humanintheloop', 'simulations', 'and', 'experiments']] | [-0.094192037078832, 0.054393942476212785, -0.056071427575853115, 0.026917981196331656, -0.15338970048652661, -0.1969686581629452, 0.058654142741498154, 0.47829080518934275, -0.262101496628427, -0.3642869232730432, 0.07845135475753097, -0.20566414156776017, -0.19858813661938676, 0.15715995673220473, -0.18308756191401915, 0.13753660731147843, 0.12647673138091667, 0.04825567546255001, -0.0070611906284303565, -0.23287807706046615, 0.2560114552058488, 0.022361277615638463, 0.2822105631662103, -0.007681490059280964, 0.18983842337250031, 0.04811654443741887, -0.020102815884914433, -0.031088366238335212, -0.05986945782150052, 0.14398645735231808, 0.34447019574577575, 0.2287558236654353, 0.3636540241011946, -0.45394394965516727, -0.16098237464569146, 0.0927288641638637, 0.10011687423399701, 0.029434135579951823, -0.009625543714045072, -0.3554955764536883, 0.05341401525245575, -0.18882135512332524, -0.04703413100483326, -0.09782111874970419, 0.011889027366479794, -0.01657783031427803, -0.31389745991755197, -0.01560131923972883, 0.08302127219853805, 0.07033631778029087, -0.12438525892330099, -0.05890435132790695, 0.017104132726163297, 0.1780156251702497, 0.045691753599232623, 0.005643939910581908, 0.19136360193231514, -0.16477497000331906, -0.23393382580455888, 0.37672276253375664, 0.03366596882485531, -0.2064884366285238, 0.15976158759419942, -0.019235104732736423, -0.15374076075793303, 0.10746369072581297, 0.207846127300673, 0.1271228750653148, -0.1883888011277243, 0.07304155850869284, -0.0142737011249353, 0.2052367633319349, 0.012983028185097957, -0.042304895245111905, 0.16370097245578166, 0.22983232767718448, 0.10496553158960663, 0.12658252260790995, -0.03512382425426447, -0.12612803917992013, -0.2634242197589858, -0.0939293292744274, -0.1267734218284592, -0.07485605825562604, -0.0861541827729703, -0.09694962006624401, 0.3695101618843208, 0.1907608272651067, 0.14008183093941803, 0.14582588918949965, 0.3472428808861471, 0.06317634455830354, 0.06306978711415526, 0.08546866809866241, 0.15291341381811804, -0.04089336966691943, 0.1712954391487646, -0.28339468701123877, 0.15764552953333913, 0.027551078537179457] |
1,802.0684 | Voice Impersonation using Generative Adversarial Networks | Voice impersonation is not the same as voice transformation, although the
latter is an essential element of it. In voice impersonation, the resultant
voice must convincingly convey the impression of having been naturally produced
by the target speaker, mimicking not only the pitch and other perceivable
signal qualities, but also the style of the target speaker. In this paper, we
propose a novel neural network based speech quality- and style- mimicry
framework for the synthesis of impersonated voices. The framework is built upon
a fast and accurate generative adversarial network model. Given spectrographic
representations of source and target speakers' voices, the model learns to
mimic the target speaker's voice quality and style, regardless of the
linguistic content of either's voice, generating a synthetic spectrogram from
which the time domain signal is reconstructed using the Griffin-Lim method. In
effect, this model reframes the well-known problem of style-transfer for images
as the problem of style-transfer for speech signals, while intrinsically
addressing the problem of durational variability of speech sounds. Experiments
demonstrate that the model can generate extremely convincing samples of
impersonated speech. It is even able to impersonate voices across different
genders effectively. Results are qualitatively evaluated using standard
procedures for evaluating synthesized voices.
| cs.SD eess.AS | voice impersonation is not the same as voice transformation although the latter is an essential element of it in voice impersonation the resultant voice must convincingly convey the impression of having been naturally produced by the target speaker mimicking not only the pitch and other perceivable signal qualities but also the style of the target speaker in this paper we propose a novel neural network based speech quality and style mimicry framework for the synthesis of impersonated voices the framework is built upon a fast and accurate generative adversarial network model given spectrographic representations of source and target speakers voices the model learns to mimic the target speakers voice quality and style regardless of the linguistic content of eithers voice generating a synthetic spectrogram from which the time domain signal is reconstructed using the griffinlim method in effect this model reframes the wellknown problem of styletransfer for images as the problem of styletransfer for speech signals while intrinsically addressing the problem of durational variability of speech sounds experiments demonstrate that the model can generate extremely convincing samples of impersonated speech it is even able to impersonate voices across different genders effectively results are qualitatively evaluated using standard procedures for evaluating synthesized voices | [['voice', 'impersonation', 'is', 'not', 'the', 'same', 'as', 'voice', 'transformation', 'although', 'the', 'latter', 'is', 'an', 'essential', 'element', 'of', 'it', 'in', 'voice', 'impersonation', 'the', 'resultant', 'voice', 'must', 'convincingly', 'convey', 'the', 'impression', 'of', 'having', 'been', 'naturally', 'produced', 'by', 'the', 'target', 'speaker', 'mimicking', 'not', 'only', 'the', 'pitch', 'and', 'other', 'perceivable', 'signal', 'qualities', 'but', 'also', 'the', 'style', 'of', 'the', 'target', 'speaker', 'in', 'this', 'paper', 'we', 'propose', 'a', 'novel', 'neural', 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1,802.06841 | Full Virtualization of Renault's Engine Management Software and
Application to System Development | Virtualization allows the simulation of automotive ECUs on a Windows PC
executing in closed-loop with a vehicle simulation model. This approach enables
to move certain development tasks from road or test rigs and HiL (Hardware in
the loop) to PCs, where they can often be performed faster and cheaper. Renault
has recently established such a virtualization process for powertrain control
software based on Simulink models. If the number of runnables exceeds a
threshold (about 1500) the execution of the virtual ECU is no longer straight
forward and specific techniques are required. This paper describes the
motivation behind a Simulink model based process, the virtualization process
and applications of the resulting virtual ECUs. Domain: Critical Transportation
Systems Topic: Processes, methods and tools, in particular: virtual engineering
and simulation 1. Motivation Since 2010, Renault has established a framework to
develop engine control software for Diesel and Gasoline engines [6]. The
framework is heavily based on MATLAB/Simulink and the idea of model-based
development, which facilitates the carry-over and carry-across of application
software between software projects. In the Renault EMS architecture software is
composed in to about 20 functions, such as Air System, Combustion etc. A
function consists of modules. A module is the smallest testable software unit
and contains runnables to be scheduled and executed by the Operating System
(Os) of the ECU. The Renault EMS development process includes basically the
following steps [5]. 1. Specification of about 200 generic configurable modules
per ECU using MATLAB/Simulink. 2. Generation of C code (EMS application
software) from all module specifications using MATLAB/Simulink Embedded Coder.
3. MiL (Model in the Loop) test and validation of the resulting executable
specifications at module level in a simulated system environment, considering
only essential interactions with other modules and system environment. This is
essentially a back-to-back test to make sure that the Simulink model of a
module and the corresponding production C code show equivalent and intended
behaviour. To insure software quality, this step is repeatedly performed with
steps 1 and 2, based on the simulation capabilities of MATLAB/Simulink. 4.
Configuration of modules to fit to the specific needs of a software project,
such as absence or presence of certain components. 5. Integration of generated
configured C code and hand-coded platform software (basic software) on supplied
target hardware, a real ECU that communicates with other controllers via CAN
and other busses. 6. Validation and test of all modules on system level using
the real ECU. In contrast to step 3, the interactions of all modules and
interactions with the system environment are visible then and subject to
testing. For example, the Os runs all scheduled runnables then, not just those
of the modules considered to be 'essential' for a module under test. Critical
assessment of the above process shows that there is a considerable delay
between delivery of a set of specifications to the software project team (at
the end of step 3) and system-level tests based on an ECU that runs entire
software (step 6). Typical delays are weeks or months.
| cs.SE | virtualization allows the simulation of automotive ecus on a windows pc executing in closedloop with a vehicle simulation model this approach enables to move certain development tasks from road or test rigs and hil hardware in the loop to pcs where they can often be performed faster and cheaper renault has recently established such a virtualization process for powertrain control software based on simulink models if the number of runnables exceeds a threshold about 1500 the execution of the virtual ecu is no longer straight forward and specific techniques are required this paper describes the motivation behind a simulink model based process the virtualization process and applications of the resulting virtual ecus domain critical transportation systems topic processes methods and tools in particular virtual engineering and simulation 1 motivation since 2010 renault has established a framework to develop engine control software for diesel and gasoline engines 6 the framework is heavily based on matlabsimulink and the idea of modelbased development which facilitates the carryover and carryacross of application software between software projects in the renault ems architecture software is composed in to about 20 functions such as air system combustion etc a function consists of modules a module is the smallest testable software unit and contains runnables to be scheduled and executed by the operating system os of the ecu the renault ems development process includes basically the following steps 5 1 specification of about 200 generic configurable modules per ecu using matlabsimulink 2 generation of c code ems application software from all module specifications using matlabsimulink embedded coder 3 mil model in the loop test and validation of the resulting executable specifications at module level in a simulated system environment considering only essential interactions with other modules and system environment this is essentially a backtoback test to make sure that the simulink model of a module and the corresponding production c code show equivalent and intended behaviour to insure software quality this step is repeatedly performed with steps 1 and 2 based on the simulation capabilities of matlabsimulink 4 configuration of modules to fit to the specific needs of a software project such as absence or presence of certain components 5 integration of generated configured c code and handcoded platform software basic software on supplied target hardware a real ecu that communicates with other controllers via can and other busses 6 validation and test of all modules on system level using the real ecu in contrast to step 3 the interactions of all modules and interactions with the system environment are visible then and subject to testing for example the os runs all scheduled runnables then not just those of the modules considered to be essential for a module under test critical assessment of the above process shows that there is a considerable 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1,802.06842 | Zero-Shot Question Generation from Knowledge Graphs for Unseen
Predicates and Entity Types | We present a neural model for question generation from knowledge base triples
in a "Zero-Shot" setup, that is generating questions for triples containing
predicates, subject types or object types that were not seen at training time.
Our model leverages triples occurrences in the natural language corpus in an
encoder-decoder architecture, paired with an original part-of-speech copy
action mechanism to generate questions. Benchmark and human evaluation show
that our model sets a new state-of-the-art for zero-shot QG.
| cs.CL | we present a neural model for question generation from knowledge base triples in a zeroshot setup that is generating questions for triples containing predicates subject types or object types that were not seen at training time our model leverages triples occurrences in the natural language corpus in an encoderdecoder architecture paired with an original partofspeech copy action mechanism to generate questions benchmark and human evaluation show that our model sets a new stateoftheart for zeroshot qg | [['we', 'present', 'a', 'neural', 'model', 'for', 'question', 'generation', 'from', 'knowledge', 'base', 'triples', 'in', 'a', 'zeroshot', 'setup', 'that', 'is', 'generating', 'questions', 'for', 'triples', 'containing', 'predicates', 'subject', 'types', 'or', 'object', 'types', 'that', 'were', 'not', 'seen', 'at', 'training', 'time', 'our', 'model', 'leverages', 'triples', 'occurrences', 'in', 'the', 'natural', 'language', 'corpus', 'in', 'an', 'encoderdecoder', 'architecture', 'paired', 'with', 'an', 'original', 'partofspeech', 'copy', 'action', 'mechanism', 'to', 'generate', 'questions', 'benchmark', 'and', 'human', 'evaluation', 'show', 'that', 'our', 'model', 'sets', 'a', 'new', 'stateoftheart', 'for', 'zeroshot', 'qg']] | [-0.061538587716457094, 0.0009275785694051976, -0.01998167257376113, 0.10866508893607381, -0.13190435221430993, -0.1658743027855005, 0.035514937575882005, 0.4238965923064633, -0.2765568344559717, -0.36958353517356474, -0.04019685668448035, -0.3119442573944597, -0.1616072431543695, 0.21582026385064973, -0.1673160231255583, 0.024692552464425956, 0.2240171139618676, 0.09980111639015377, 0.003475937180490674, -0.28528100619778823, 0.3647379180091727, -0.020651220294990037, 0.3083203657481231, -0.013374252870753958, 0.12263120371407192, -0.05916202848311514, -0.0007726239794129995, -0.062019765475078634, -0.029314349805166496, 0.14911383084070526, 0.3093830104243304, 0.2616277032188679, 0.28028547981950014, -0.3809931742174453, -0.24184990016204355, 0.07774997006268486, 0.09104268712383744, 0.11923088726440542, -0.05640138410595491, -0.34010388913922823, 0.11127843340172579, -0.19959368205960154, 0.04820831538496637, -0.13170440579568476, 0.02494065710465963, -0.06362102170379857, -0.34348257380310987, -0.0016419405522021023, 0.1620881844091376, 0.09806447385160841, -0.07097063396787762, -0.08682874279513367, 0.06469591725372563, 0.13444423223049135, 0.0022198082419651512, 0.08553989313689894, 0.08315648439288213, -0.1706846373448283, -0.24803120690385663, 0.37971011338461386, -0.05553668080583999, -0.24719782271667531, 0.1937061119824648, -0.007790714747419483, -0.20410029805804553, 0.030644338516714543, 0.19442842866441137, 0.14719286482585103, -0.16261677099636904, 0.022354250013258456, -0.13044415516043573, 0.2499960812151824, 0.11066775963837772, 0.0024629446469541442, 0.24843047973454782, 0.2608465355304744, -0.04924258856887096, 0.15231921619392538, -0.055319020916756834, -0.04579207138464737, -0.2742656557422474, -0.09202798118349165, -0.13133264130814687, -0.004008906390816647, -0.046811277886023926, -0.19018142578486158, 0.39485102610074374, 0.24955922775705786, 0.20128387551583155, 0.11319952011476025, 0.29477111924145566, -0.028248512734487457, 0.13959565595953455, 0.08629548802089534, 0.06104762156304021, -0.0402546263679764, 0.07296392238257747, -0.12495122607613571, 0.036615386157982835, 0.1243732989532873] |
1,802.06843 | Two mechanisms of formation of asthenospheric layers | The theory of plate tectonics describes some basic global tectonic processes
as a result of motion of lithospheric plates. The boundary between lithosphere
and asthenosphere (LAB) is defined by a difference in response to stress.
Position of LAB is determined by: (i) the ratio (melting temperature)/(
temperature) and (ii) an invariant of the stress tensor. We consider the role
of these both factors for origin and decay of asthenosphere. We find that the
asthenosphere of shear stress origin could be a transient, time-dependent
feature.
| physics.geo-ph | the theory of plate tectonics describes some basic global tectonic processes as a result of motion of lithospheric plates the boundary between lithosphere and asthenosphere lab is defined by a difference in response to stress position of lab is determined by i the ratio melting temperature temperature and ii an invariant of the stress tensor we consider the role of these both factors for origin and decay of asthenosphere we find that the asthenosphere of shear stress origin could be a transient timedependent feature | [['the', 'theory', 'of', 'plate', 'tectonics', 'describes', 'some', 'basic', 'global', 'tectonic', 'processes', 'as', 'a', 'result', 'of', 'motion', 'of', 'lithospheric', 'plates', 'the', 'boundary', 'between', 'lithosphere', 'and', 'asthenosphere', 'lab', 'is', 'defined', 'by', 'a', 'difference', 'in', 'response', 'to', 'stress', 'position', 'of', 'lab', 'is', 'determined', 'by', 'i', 'the', 'ratio', 'melting', 'temperature', 'temperature', 'and', 'ii', 'an', 'invariant', 'of', 'the', 'stress', 'tensor', 'we', 'consider', 'the', 'role', 'of', 'these', 'both', 'factors', 'for', 'origin', 'and', 'decay', 'of', 'asthenosphere', 'we', 'find', 'that', 'the', 'asthenosphere', 'of', 'shear', 'stress', 'origin', 'could', 'be', 'a', 'transient', 'timedependent', 'feature']] | [-0.1440999444984343, 0.19926293284810354, -0.10089691334758841, 0.002887007483791205, -0.043673233389632686, -0.05178543647551643, -0.006647639449164714, 0.33202742736986174, -0.29295771611144855, -0.24644148519672898, 0.10857297332231178, -0.2403171549418143, -0.15105201633802304, 0.15628708604102334, -0.03153899931792347, 0.02778004781742181, -0.005561007408513909, 0.0010135390440977755, -0.05868149141038191, -0.13749919807083816, 0.30914785929711625, 0.07500855384638444, 0.2873227712698281, 0.10738265429002543, 0.08351088327998739, -0.03194590650188426, -0.0337600749929455, 0.05400464009670984, -0.15887365706718506, 0.028866426392813168, 0.21815296382244145, 0.08120482207630716, 0.21921617874232607, -0.45275454052413505, -0.18590755378162221, 0.041599421917150416, 0.05641937342062149, 0.05230160124448871, -0.00820408005356079, -0.22550072183921224, 0.025103722868065927, -0.1185405751845489, -0.16238028351550124, -0.017459950698096128, 0.07141109001601026, 0.0071475812721820105, -0.25870146083512474, 0.1684119618120825, 0.06831818718152742, 0.12352279609157926, -0.15989875117139446, -0.1150667020396906, -0.05013614593051551, 0.1283335222618743, 0.11473070375532621, 0.014294479086640336, 0.22708040221949063, -0.15675157787544386, -0.03803502790452469, 0.3862326473795942, -0.09577966643735722, -0.1556144577400465, 0.17590064185649334, -0.1589665424987851, -0.03408953559673613, 0.13212077166619046, 0.1901963315682397, 0.06275457867221641, -0.1675900120753795, 0.01342004322283347, -0.0007447937179157245, 0.11981347167221386, 0.09408147548258837, -0.0647300517663271, 0.25490971320375266, 0.1817111143609509, 0.013152844522015325, 0.1247435205025665, -0.13549289839976977, -0.03802710098014878, -0.37003320260416894, -0.2033349578324262, -0.1259029206329225, 0.03758847821016042, -0.08963404874087982, -0.19839507135163462, 0.3569821010238402, 0.1009204137316417, 0.1866155816789528, 0.012455777292849407, 0.22275584619048805, 0.09319642721536747, 0.05932803194792498, 0.0655333032343714, 0.31587747528413146, 0.1596737397291387, 0.12177248472081763, -0.2712722205102355, 0.1143935714963369, 0.06486055621921662] |
1,802.06844 | On Generalization of Definitional Equivalence to Languages with
Non-Disjoint Signatures | For simplicity, most of the literature introduces the concept of definitional
equivalence only to languages with disjoint signatures. In a recent paper,
Barrett and Halvorson introduce a straightforward generalization to languages
with non-disjoint signatures and they show that their generalization is not
equivalent to intertranslatability in general. In this paper, we show that
their generalization is not transitive and hence it is not an equivalence
relation. Then we introduce the Andr\'eka and N\'emeti generalization as one of
the many equivalent formulations for languages with disjoint signatures. We
show that the Andr\'eka-N\'emeti generalization is the smallest equivalence
relation containing the Barrett-Halvorson generalization and it is equivalent
to intertranslatability even for languages with non-disjoint signatures.
Finally, we investigate which definitions for definitional equivalences remain
equivalent when we generalize them for theories with non-disjoint signatures.
| math.LO | for simplicity most of the literature introduces the concept of definitional equivalence only to languages with disjoint signatures in a recent paper barrett and halvorson introduce a straightforward generalization to languages with nondisjoint signatures and they show that their generalization is not equivalent to intertranslatability in general in this paper we show that their generalization is not transitive and hence it is not an equivalence relation then we introduce the andreka and nemeti generalization as one of the many equivalent formulations for languages with disjoint signatures we show that the andrekanemeti generalization is the smallest equivalence relation containing the barretthalvorson generalization and it is equivalent to intertranslatability even for languages with nondisjoint signatures finally we investigate which definitions for definitional equivalences remain equivalent when we generalize them for theories with nondisjoint signatures | [['for', 'simplicity', 'most', 'of', 'the', 'literature', 'introduces', 'the', 'concept', 'of', 'definitional', 'equivalence', 'only', 'to', 'languages', 'with', 'disjoint', 'signatures', 'in', 'a', 'recent', 'paper', 'barrett', 'and', 'halvorson', 'introduce', 'a', 'straightforward', 'generalization', 'to', 'languages', 'with', 'nondisjoint', 'signatures', 'and', 'they', 'show', 'that', 'their', 'generalization', 'is', 'not', 'equivalent', 'to', 'intertranslatability', 'in', 'general', 'in', 'this', 'paper', 'we', 'show', 'that', 'their', 'generalization', 'is', 'not', 'transitive', 'and', 'hence', 'it', 'is', 'not', 'an', 'equivalence', 'relation', 'then', 'we', 'introduce', 'the', 'andreka', 'and', 'nemeti', 'generalization', 'as', 'one', 'of', 'the', 'many', 'equivalent', 'formulations', 'for', 'languages', 'with', 'disjoint', 'signatures', 'we', 'show', 'that', 'the', 'andrekanemeti', 'generalization', 'is', 'the', 'smallest', 'equivalence', 'relation', 'containing', 'the', 'barretthalvorson', 'generalization', 'and', 'it', 'is', 'equivalent', 'to', 'intertranslatability', 'even', 'for', 'languages', 'with', 'nondisjoint', 'signatures', 'finally', 'we', 'investigate', 'which', 'definitions', 'for', 'definitional', 'equivalences', 'remain', 'equivalent', 'when', 'we', 'generalize', 'them', 'for', 'theories', 'with', 'nondisjoint', 'signatures']] | [-0.06914173027930351, 0.07472774876883845, -0.046617780367915446, 0.12959701699348022, -0.12098198623503917, -0.16649849666998937, 0.01604518631222443, 0.3727056889866407, -0.30521832222136885, -0.2659161028882059, 0.07749162521661045, -0.2778124668993629, -0.18079420275842914, 0.19719160752227674, -0.1582145630614832, -0.03181672184280335, 0.08354546538769053, 0.02274839562865404, -0.09840692386407261, -0.2419567322036108, 0.3528732764176451, -0.00854348679108975, 0.24537752578751398, 0.07932863878623511, 0.09163835926044088, -0.011644358629396615, -0.008547914278908417, 0.10600495271456356, -0.1435641309165266, 0.1146653966476711, 0.2855426120929993, 0.21266196189591519, 0.22934494041837752, -0.3480809518207724, -0.13111338534464057, 0.1563822636416612, 0.09846700569614768, 0.10915017566339184, 0.012894851141251051, -0.261247206128274, 0.13691413134981234, -0.19295413439842657, -0.05659699928230391, -0.09641765061353978, 0.06547482104685444, -0.007179445264717707, -0.20241305340582935, 0.005347672464827506, 0.16626341935390462, 0.07522165284183127, -0.028176358039490878, -0.0447290803780421, 0.035232548315364584, 0.0739089587732451, 0.03872745670199108, -0.008335797270186818, 0.01155463487912829, -0.09146023631060066, -0.17203212143638386, 0.4022448644042015, -0.057175412092160864, -0.2578208630761275, 0.2749219581269874, -0.08891992787673819, -0.2177211910342941, 0.013466387772216247, 0.0704179318048633, 0.11695116056630818, -0.12024278692204882, 0.08853789807718175, -0.11793898773164703, 0.138315169312633, 0.1001852609288807, 0.09209451173441126, 0.1959285485594032, 0.10501620835947016, 0.06359249521002101, 0.1733996384884589, 0.03258609067303881, -0.07117417532807359, -0.3098525889576055, -0.19747214579883104, -0.07595458152489021, 0.009787448503126283, -0.021190330077549262, -0.18151457749392227, 0.3675363259963118, 0.1953845058603642, 0.16478900988228046, 0.1795459840598946, 0.25719416500069203, 0.08212677888267746, 0.10277724139607297, 0.09669157898483369, 0.18582618618025804, 0.15112510087828224, 0.013030446041375399, -0.12911872059787408, 0.06500008849946495, 0.11467886125812164] |
1,802.06845 | Wall-bounded flow over a realistically rough superhydrophobic surface | Direct numerical simulations (DNS) are performed for two wall-bounded flow
configurations: laminar Couette flow at $Re=740$ and turbulent channel flow at
$Re_{\tau}=180$, where $\tau$ is the shear stress at the wall. The top wall is
smooth and the bottom wall is a realistically rough superhydrophobic surface
(SHS), generated from a three-dimensional surface profile measurement. The
air-water interface, which is assumed to be flat, is simulated using the
volume-of-fluid (VOF) approach. The laminar Couette flow is studied with
varying interface heights $h$ to understand the effect on slip and drag
reduction ($DR$). The presence of the surface roughness is felt up to $40\%$ of
the channel height in the wall-normal direction. A nonlinear dependence of $DR$
on $h$ is observed with three distinct regions. The DNS results are used to
obtain a nonlinear curve fit for gas fraction $\phi_g$ as a function of $h$,
where $\phi_g$ determines the amount of slip area exposed to the flow. A power
law linear regression fit is used to obtain $b_{eff}$ as a function of
$\phi_g$. For the turbulent channel flow, statistics of the flow field are
compared to that of a smooth wall to understand the effects of roughness and
$h$. Two interface heights, $h=h_{rms}$ and $h=h_{max}$ are simulated to study
their effect on the behaviour of the flow, where $h_{rms}$ and $h_{max}$ are
the rms and maximum peak of the roughness heights respectively. Results show
that the presence of trapped air in the cavities significantly alters near wall
flow physics. The fully wetted roughness increases the peak value in turbulent
intensities, whereas the presence of the interface suppresses them. Overall,
there exists a competing effect between the interface and the asperities, where
the interface suppresses turbulence whereas the asperities enhance them.
| physics.flu-dyn | direct numerical simulations dns are performed for two wallbounded flow configurations laminar couette flow at re740 and turbulent channel flow at re_tau180 where tau is the shear stress at the wall the top wall is smooth and the bottom wall is a realistically rough superhydrophobic surface shs generated from a threedimensional surface profile measurement the airwater interface which is assumed to be flat is simulated using the volumeoffluid vof approach the laminar couette flow is studied with varying interface heights h to understand the effect on slip and drag reduction dr the presence of the surface roughness is felt up to 40 of the channel height in the wallnormal direction a nonlinear dependence of dr on h is observed with three distinct regions the dns results are used to obtain a nonlinear curve fit for gas fraction phi_g as a function of h where phi_g determines the amount of slip area exposed to the flow a power law linear regression fit is used to obtain b_eff as a function of phi_g for the turbulent channel flow statistics of the flow field are compared to that of a smooth wall to understand the effects of roughness and h two interface heights hh_rms and hh_max are simulated to study their effect on the behaviour of the flow where h_rms and h_max are the rms and maximum peak of the roughness heights respectively results show that the presence of trapped air in the cavities significantly alters near wall flow physics the fully wetted roughness increases the peak value in turbulent intensities whereas the presence of the interface suppresses them overall there exists a competing effect between the interface and the asperities where the interface suppresses turbulence whereas the asperities enhance them | [['direct', 'numerical', 'simulations', 'dns', 'are', 'performed', 'for', 'two', 'wallbounded', 'flow', 'configurations', 'laminar', 'couette', 'flow', 'at', 're740', 'and', 'turbulent', 'channel', 'flow', 'at', 're_tau180', 'where', 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1,802.06846 | Are DY\,Persei stars cooler cousins of R Coronae Borealis stars? | In this paper we present for the first time, the study of low resolution $H$-
and $K$- band spectra of 7 DY\,Per type and suspects stars as well as
DY\,Persei itself. We also observed $H$- and $K$- band spectra of 3 R Coronae
Borealis (RCB) stars, 1 hydrogen-deficient carbon (HdC) star and 14 cool carbon
stars including normal giants as comparisons. High $^{12}$C/$^{13}$C and low
$^{16}$O/$^{18}$O ratios are characteristic features of majority RCBs and HdCs.
We have estimated $^{16}$O/$^{18}$O ratios of the programme stars from the
relative strengths of the $^{12}$C$^{16}$O and $^{12}$C$^{18}$O molecular bands
observed in $K$- band. Our preliminary analysis suggest that a quartet of the
DY\,Per suspects along with DY\,Persei itself seems to show isotopic ratio
strength consistent with the ones of RCB/HdC stars whereas two of them do not
show significant $^{13}$C and $^{18}$O in their atmospheres. Our analysis
provides further indications that DY\,Per type stars could be related to
RCB/HdC class of stars.
| astro-ph.SR | in this paper we present for the first time the study of low resolution h and k band spectra of 7 dyper type and suspects stars as well as dypersei itself we also observed h and k band spectra of 3 r coronae borealis rcb stars 1 hydrogendeficient carbon hdc star and 14 cool carbon stars including normal giants as comparisons high 12c13c and low 16o18o ratios are characteristic features of majority rcbs and hdcs we have estimated 16o18o ratios of the programme stars from the relative strengths of the 12c16o and 12c18o molecular bands observed in k band our preliminary analysis suggest that a quartet of the dyper suspects along with dypersei itself seems to show isotopic ratio strength consistent with the ones of rcbhdc stars whereas two of them do not show significant 13c and 18o in their atmospheres our analysis provides further indications that dyper type stars could be related to rcbhdc class of stars | [['in', 'this', 'paper', 'we', 'present', 'for', 'the', 'first', 'time', 'the', 'study', 'of', 'low', 'resolution', 'h', 'and', 'k', 'band', 'spectra', 'of', '7', 'dyper', 'type', 'and', 'suspects', 'stars', 'as', 'well', 'as', 'dypersei', 'itself', 'we', 'also', 'observed', 'h', 'and', 'k', 'band', 'spectra', 'of', '3', 'r', 'coronae', 'borealis', 'rcb', 'stars', '1', 'hydrogendeficient', 'carbon', 'hdc', 'star', 'and', '14', 'cool', 'carbon', 'stars', 'including', 'normal', 'giants', 'as', 'comparisons', 'high', '12c13c', 'and', 'low', '16o18o', 'ratios', 'are', 'characteristic', 'features', 'of', 'majority', 'rcbs', 'and', 'hdcs', 'we', 'have', 'estimated', '16o18o', 'ratios', 'of', 'the', 'programme', 'stars', 'from', 'the', 'relative', 'strengths', 'of', 'the', '12c16o', 'and', '12c18o', 'molecular', 'bands', 'observed', 'in', 'k', 'band', 'our', 'preliminary', 'analysis', 'suggest', 'that', 'a', 'quartet', 'of', 'the', 'dyper', 'suspects', 'along', 'with', 'dypersei', 'itself', 'seems', 'to', 'show', 'isotopic', 'ratio', 'strength', 'consistent', 'with', 'the', 'ones', 'of', 'rcbhdc', 'stars', 'whereas', 'two', 'of', 'them', 'do', 'not', 'show', 'significant', '13c', 'and', '18o', 'in', 'their', 'atmospheres', 'our', 'analysis', 'provides', 'further', 'indications', 'that', 'dyper', 'type', 'stars', 'could', 'be', 'related', 'to', 'rcbhdc', 'class', 'of', 'stars']] | [-0.05599193194625424, 0.12746062878370162, -0.008381170677203759, 0.05664554253156644, -0.05342936491764157, -0.09783592102805676, 0.12909912931492393, 0.42768365268905956, -0.15743065295852052, -0.3608616871966256, 0.02778696885037242, -0.30797101406295313, -0.04812168652569157, 0.15649747192219365, -0.04062940978925992, -0.07646480593160769, 0.11391450328298912, -0.029071619186331246, -0.036261313100302825, -0.2298268604882098, 0.27455494301454497, 0.04726856071623712, 0.13812966808506283, 0.0051074072694272, -0.042197946449924334, -0.14467514228696624, -0.05450659578063471, -0.006791382948898412, -0.14483160318951716, 0.050192440503879505, 0.2782706165552334, 0.12481176277646928, 0.15635840756076028, -0.3217843031827239, -0.18127118985418206, 0.06063228146800029, 0.21161767188763989, 0.026914193010371592, -0.04647488991297733, -0.22119919639354682, 0.12848645049791016, -0.16395534471200865, -0.1549555197406828, -0.02328480173775841, 0.06889868198834616, 0.05207958809949238, -0.23176650457035483, 0.08325599119891991, 0.08308762420537415, 0.15502090742994173, -0.12620998465523026, -0.25818575172398994, -0.07677757682954418, 0.058599955411445276, 0.042959195494749185, 0.010913906876131698, 0.13216013096716542, -0.0917546064882034, -0.01868259228288129, 0.4162005336918667, -0.16082854224277623, 0.03806080476813067, 0.25058930793326667, -0.2029063001615939, -0.21896036741707256, 0.13326391461276788, 0.10366907837843291, 0.18909317800726475, -0.1346451629857149, 0.0004154656974909206, -0.009636692424286521, 0.17085315339918572, 0.05613885977262863, 0.08053088130344169, 0.27661582307123084, 0.09935402824525155, -0.01996144147443713, 0.07637213938336916, -0.22938627359975478, 0.0030180518911067955, -0.22435129564133735, -0.1825871132466382, -0.08285242279464976, 0.053693311222090104, -0.11672602624334151, -0.11775619241034649, 0.3137558973285908, 0.07068781589452341, 0.2246119147592705, 0.007575770191775233, 0.23830304065950556, 0.06348652595249339, 0.10857634464723173, 0.1041459638345378, 0.27394278662194027, 0.23983086102940385, 0.10422806251258437, -0.25019537310840356, 0.0751075342060158, -0.038289665740616374] |
1,802.06847 | Distribution Matching in Variational Inference | With the increasingly widespread deployment of generative models, there is a
mounting need for a deeper understanding of their behaviors and limitations. In
this paper, we expose the limitations of Variational Autoencoders (VAEs), which
consistently fail to learn marginal distributions in both latent and visible
spaces. We show this to be a consequence of learning by matching conditional
distributions, and the limitations of explicit model and posterior
distributions. It is popular to consider Generative Adversarial Networks (GANs)
as a means of overcoming these limitations, leading to hybrids of VAEs and
GANs. We perform a large-scale evaluation of several VAE-GAN hybrids and
analyze the implications of class probability estimation for learning
distributions. While promising, we conclude that at present, VAE-GAN hybrids
have limited applicability: they are harder to scale, evaluate, and use for
inference compared to VAEs; and they do not improve over the generation quality
of GANs.
| stat.ML cs.LG | with the increasingly widespread deployment of generative models there is a mounting need for a deeper understanding of their behaviors and limitations in this paper we expose the limitations of variational autoencoders vaes which consistently fail to learn marginal distributions in both latent and visible spaces we show this to be a consequence of learning by matching conditional distributions and the limitations of explicit model and posterior distributions it is popular to consider generative adversarial networks gans as a means of overcoming these limitations leading to hybrids of vaes and gans we perform a largescale evaluation of several vaegan hybrids and analyze the implications of class probability estimation for learning distributions while promising we conclude that at present vaegan hybrids have limited applicability they are harder to scale evaluate and use for inference compared to vaes and they do not improve over the generation quality of gans | [['with', 'the', 'increasingly', 'widespread', 'deployment', 'of', 'generative', 'models', 'there', 'is', 'a', 'mounting', 'need', 'for', 'a', 'deeper', 'understanding', 'of', 'their', 'behaviors', 'and', 'limitations', 'in', 'this', 'paper', 'we', 'expose', 'the', 'limitations', 'of', 'variational', 'autoencoders', 'vaes', 'which', 'consistently', 'fail', 'to', 'learn', 'marginal', 'distributions', 'in', 'both', 'latent', 'and', 'visible', 'spaces', 'we', 'show', 'this', 'to', 'be', 'a', 'consequence', 'of', 'learning', 'by', 'matching', 'conditional', 'distributions', 'and', 'the', 'limitations', 'of', 'explicit', 'model', 'and', 'posterior', 'distributions', 'it', 'is', 'popular', 'to', 'consider', 'generative', 'adversarial', 'networks', 'gans', 'as', 'a', 'means', 'of', 'overcoming', 'these', 'limitations', 'leading', 'to', 'hybrids', 'of', 'vaes', 'and', 'gans', 'we', 'perform', 'a', 'largescale', 'evaluation', 'of', 'several', 'vaegan', 'hybrids', 'and', 'analyze', 'the', 'implications', 'of', 'class', 'probability', 'estimation', 'for', 'learning', 'distributions', 'while', 'promising', 'we', 'conclude', 'that', 'at', 'present', 'vaegan', 'hybrids', 'have', 'limited', 'applicability', 'they', 'are', 'harder', 'to', 'scale', 'evaluate', 'and', 'use', 'for', 'inference', 'compared', 'to', 'vaes', 'and', 'they', 'do', 'not', 'improve', 'over', 'the', 'generation', 'quality', 'of', 'gans']] | [0.009400583170694901, 0.02249066946635238, -0.08305400386009187, 0.16757843918745172, -0.11464960249711056, -0.13693938851926704, 0.04655212080217011, 0.47562980305935654, -0.24333906283944237, -0.32734362454768146, 0.07088341971472868, -0.2539288633685958, -0.18599785011274372, 0.16534995332401448, -0.14965003303435892, 0.11028347181815172, 0.09219461554648722, -0.025004660728115108, -0.0863000177746626, -0.24351171008944764, 0.32757586544081824, 0.030055731528622356, 0.3507964762029092, 0.03358579605982519, 0.1049926940788876, -0.053478924486291955, -0.002955050442089029, -0.01227695542406671, -0.08695953054739468, 0.2054353850469196, 0.2835919445765501, 0.19322145177799016, 0.3703090876854044, -0.4341306177911913, -0.2872892209411073, 0.14971068007618088, 0.16084785931300194, 0.0935542183131499, -0.05336860011705533, -0.3076141521550056, 0.11265440678642112, -0.2079023702741683, -0.018518395173889236, -0.19855750613801537, -0.0470891584258932, 0.03238630588411917, -0.2803807197784891, 0.025840045447100182, 0.098000991753727, 0.033566941950647605, -0.02445655624813014, -0.13952795829826675, 0.010685523396174164, 0.14943594668934845, 0.06410518171246715, 0.013988009676159848, 0.07583648662303011, -0.2248136943730753, -0.144599837352376, 0.33535102569200353, -0.0411993679178714, -0.21259640334617524, 0.21949081995514963, -0.05391429932661304, -0.1788629747857498, 0.05883034298728619, 0.21109104602158918, 0.13758933565660134, -0.1388243997634268, 0.007572828525943416, 0.015279908138675755, 0.08885795205552764, 0.026328500581202, 0.06359783510303721, 0.18529252597561652, 0.21432988177414755, 0.032584910512249286, 0.11449832763906163, -0.1158215495390298, -0.10619415731927963, -0.23398747590060034, -0.1286334426642782, -0.17338634087533064, 0.023865362166107924, -0.058672114470213345, -0.17963345770276276, 0.3699652720274416, 0.2523006004103947, 0.22575710112305017, 0.13064009975087607, 0.3105818366973984, 0.05275692049529543, 0.09198791302936975, 0.09454386932521958, 0.20915503096038185, 0.10306937969606496, 0.07487854470267613, -0.12268410451222389, 0.12060862427203581, -0.03752393712017204] |
1,802.06848 | Stable constant mean curvature surfaces with free boundary in slabs | We study stable constant mean curvature (CMC) hypersurfaces $\Sigma$ in slabs
in a product space $M\times\r,$ where $M$ is an orientable Riemannian manifold.
We obtain a characterization of stable cylinders and prove that if $\Sigma$ is
not a cylinder then it is locally a vertical graph. Moreover, in case $M$ is
$\h^n,\r^n$ or $\s_+^n$ and each of its boundary components is embedded then
$\Sigma$ is rotationally invariant. When $M$ has dimension 2 and Gaussian
curvature bounded from below by a positive constant $\kappa,$ we prove there is
no stable CMC with free boundary connecting the boundary components of a slab
of width $l>4\pi/\sqrt{3\kappa}.$ We also show that a stable capillary surface
of genus 0 in a warped product $[0,l]\times_f M$ where $M=\r^2, \h^2$ or
$\s^2,$ is rotationally invariant. Finally, we prove that a stable closed CMC
surface in $M\times\s^1(r),$ where $M$ is a surface with Gaussian curvature
bounded from below by a positive constant $\kappa$ and $\s^1(r)$ the circle of
radius $r,$ lifts to $M\times\r$ provided $r>4/\sqrt{3\kappa}.$
| math.DG | we study stable constant mean curvature cmc hypersurfaces sigma in slabs in a product space mtimesr where m is an orientable riemannian manifold we obtain a characterization of stable cylinders and prove that if sigma is not a cylinder then it is locally a vertical graph moreover in case m is hnrn or s_n and each of its boundary components is embedded then sigma is rotationally invariant when m has dimension 2 and gaussian curvature bounded from below by a positive constant kappa we prove there is no stable cmc with free boundary connecting the boundary components of a slab of width l4pisqrt3kappa we also show that a stable capillary surface of genus 0 in a warped product 0ltimes_f m where mr2 h2 or s2 is rotationally invariant finally we prove that a stable closed cmc surface in mtimess1r where m is a surface with gaussian curvature bounded from below by a positive constant kappa and s1r the circle of radius r lifts to mtimesr provided r4sqrt3kappa | [['we', 'study', 'stable', 'constant', 'mean', 'curvature', 'cmc', 'hypersurfaces', 'sigma', 'in', 'slabs', 'in', 'a', 'product', 'space', 'mtimesr', 'where', 'm', 'is', 'an', 'orientable', 'riemannian', 'manifold', 'we', 'obtain', 'a', 'characterization', 'of', 'stable', 'cylinders', 'and', 'prove', 'that', 'if', 'sigma', 'is', 'not', 'a', 'cylinder', 'then', 'it', 'is', 'locally', 'a', 'vertical', 'graph', 'moreover', 'in', 'case', 'm', 'is', 'hnrn', 'or', 's_n', 'and', 'each', 'of', 'its', 'boundary', 'components', 'is', 'embedded', 'then', 'sigma', 'is', 'rotationally', 'invariant', 'when', 'm', 'has', 'dimension', '2', 'and', 'gaussian', 'curvature', 'bounded', 'from', 'below', 'by', 'a', 'positive', 'constant', 'kappa', 'we', 'prove', 'there', 'is', 'no', 'stable', 'cmc', 'with', 'free', 'boundary', 'connecting', 'the', 'boundary', 'components', 'of', 'a', 'slab', 'of', 'width', 'l4pisqrt3kappa', 'we', 'also', 'show', 'that', 'a', 'stable', 'capillary', 'surface', 'of', 'genus', '0', 'in', 'a', 'warped', 'product', '0ltimes_f', 'm', 'where', 'mr2', 'h2', 'or', 's2', 'is', 'rotationally', 'invariant', 'finally', 'we', 'prove', 'that', 'a', 'stable', 'closed', 'cmc', 'surface', 'in', 'mtimess1r', 'where', 'm', 'is', 'a', 'surface', 'with', 'gaussian', 'curvature', 'bounded', 'from', 'below', 'by', 'a', 'positive', 'constant', 'kappa', 'and', 's1r', 'the', 'circle', 'of', 'radius', 'r', 'lifts', 'to', 'mtimesr', 'provided', 'r4sqrt3kappa']] | [-0.20824851378522538, 0.18292290231949193, -0.05528509286658071, 0.026295560950350107, -0.050496701498941324, -0.19863802586670642, -0.024819392682179624, 0.39765891395969155, -0.24262678952036817, -0.18680924249606, 0.1377743465163354, -0.2685368142067742, -0.12766161565611392, 0.14225524561163497, -0.09390792059913323, -0.004691578704004325, 0.04513778590689195, 0.13164586765565162, -0.08996068926982259, -0.21178989206317864, 0.4054142116183806, -0.0734418570107125, 0.15535272407937611, 0.09016488489829992, 0.11288761517556131, -0.061026889741719686, 0.051231060872705264, 0.08314891204645392, -0.2561197435119269, 0.08713915527591275, 0.1902092455420643, 0.02834720820846772, 0.21531169762458352, -0.33378884056583047, -0.22196290180761058, 0.15721535650484356, 0.11488041273651668, -0.020778226180370025, -0.00899587415681899, -0.24967227188473637, 0.15887423270212395, -0.06618584592159792, -0.17529037115911458, -0.006190631509885008, 0.10889511808959974, -0.05723433051241079, -0.25987404704174416, 0.05757408462487086, 0.12513095886664993, 0.07270869141858485, -0.08584945663352739, -0.10080739509107338, -0.11816955204294236, 0.0637594907629709, 0.030479843554339935, 0.10036106910384088, 0.10622311171351208, -0.046490078481535115, -0.010608731826514374, 0.329525886275978, -0.18428859412332388, -0.29789142216337317, 0.10080198731192928, -0.17755162437377428, -0.08095648423423646, 0.15393946280151052, 0.10350325442620634, 0.17918428839299322, -0.025256060453776392, 0.22143842503974606, -0.09515771695504678, 0.18643910353888332, 0.13815928896728122, -0.08853801412372793, 0.18674034633052847, 0.10934176916158815, 0.2005735490647005, 0.12930154130667632, -0.07193825260971753, -0.02816602677454666, -0.3461340929577012, -0.23427728694478442, -0.1783230383089962, 0.16294195099719758, -0.12881972824106924, -0.21980118048434824, 0.30563575617773575, -0.04895009159075993, 0.2238308486809313, 0.1210043888228635, 0.25738211729230337, 0.0563589634379533, 0.013658949934279569, 0.1811756492782108, 0.15328116920046556, 0.20308822145064673, -0.03870034782376922, -0.11494991786341056, -0.04878180585140477, 0.07371556870463264] |
1,802.06849 | The World Space Observatory Ultraviolet (WSO-UV), as a bridge to future
UV astronomy | The ultraviolet (UV) astronomy is a very demanded branch of space astronomy.
Many dozens of short-term UV-experiments in space, as well as long-term
observatories, have brought a very important knowledge on the physics and
chemistry of the Universe during the last decades. Unfortunately, no large
UV-observatories are planned to be launched by most of space agencies in the
coming 10 -- 15 years. Conversely, the large UVOIR observatories of the future
will appear not earlier than in 2030s. This paper briefly describes the
projects that have been proposed by various groups. We conclude that the World
Space Observatory -- Ultraviolet (WSO-UV) will be the only 2-m class UV
telescope with capabilities similar to those of the HST for the next decade.
The WSO-UV has been described in detail in previous publications, and this
paper updates the main characteristics of its instruments and the current state
of the whole project. It also addresses the major science topics that have been
included in the core program of the WSO-UV, making this core program very
relevant to the current state of the UV-astronomy. Finally, we also present
here the ground segment architecture that will implement this program.
| astro-ph.IM | the ultraviolet uv astronomy is a very demanded branch of space astronomy many dozens of shortterm uvexperiments in space as well as longterm observatories have brought a very important knowledge on the physics and chemistry of the universe during the last decades unfortunately no large uvobservatories are planned to be launched by most of space agencies in the coming 10 15 years conversely the large uvoir observatories of the future will appear not earlier than in 2030s this paper briefly describes the projects that have been proposed by various groups we conclude that the world space observatory ultraviolet wsouv will be the only 2m class uv telescope with capabilities similar to those of the hst for the next decade the wsouv has been described in detail in previous publications and this paper updates the main characteristics of its instruments and the current state of the whole project it also addresses the major science topics that have been included in the core program of the wsouv making this core program very relevant to the current state of the uvastronomy finally we also present here the ground segment architecture that will implement this program | [['the', 'ultraviolet', 'uv', 'astronomy', 'is', 'a', 'very', 'demanded', 'branch', 'of', 'space', 'astronomy', 'many', 'dozens', 'of', 'shortterm', 'uvexperiments', 'in', 'space', 'as', 'well', 'as', 'longterm', 'observatories', 'have', 'brought', 'a', 'very', 'important', 'knowledge', 'on', 'the', 'physics', 'and', 'chemistry', 'of', 'the', 'universe', 'during', 'the', 'last', 'decades', 'unfortunately', 'no', 'large', 'uvobservatories', 'are', 'planned', 'to', 'be', 'launched', 'by', 'most', 'of', 'space', 'agencies', 'in', 'the', 'coming', '10', '15', 'years', 'conversely', 'the', 'large', 'uvoir', 'observatories', 'of', 'the', 'future', 'will', 'appear', 'not', 'earlier', 'than', 'in', '2030s', 'this', 'paper', 'briefly', 'describes', 'the', 'projects', 'that', 'have', 'been', 'proposed', 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1,802.0685 | Educational Architecture and Emerging Technologies: Innovative Classroom
Models | This article has as its main objective to emphasize the importance that
physical spaces and architecture should have for a correct pedagogical
integration of the ICT, including in this concept all the current means of
communication and, in particular, the emerging technologies. Not only is it
because, as has been demonstrated, learning environments have a decisive impact
on teaching processes and students' own learning, but it is also imperative
that they be adapted for digital literacy, inevitable today in a society
dominated by ICT. The use of post-structural theoretical methodology offers an
analysis of the current situation in relation to immediate educational needs,
obtaining as a result that a redefinition of physical learning spaces is
urgently needed if we really want to carry out an education that responds to
the social impact of emerging technologies. In this sense, and focusing on the
physical classroom or traditional classroom as the basic space unit of the
centers - and in general of the educational system on the whole - which has
practically not changed its traditional structure, one points towards an
innovative model of the more versatile and flexible, adapted to the current
needs of a new curriculum and a new education for the citizens of the 21st
century.
| physics.ed-ph | this article has as its main objective to emphasize the importance that physical spaces and architecture should have for a correct pedagogical integration of the ict including in this concept all the current means of communication and in particular the emerging technologies not only is it because as has been demonstrated learning environments have a decisive impact on teaching processes and students own learning but it is also imperative that they be adapted for digital literacy inevitable today in a society dominated by ict the use of poststructural theoretical methodology offers an analysis of the current situation in relation to immediate educational needs obtaining as a result that a redefinition of physical learning spaces is urgently needed if we really want to carry out an education that responds to the social impact of emerging technologies in this sense and focusing on the physical classroom or traditional classroom as the basic space unit of the centers and in general of the educational system on the whole which has practically not changed its traditional structure one points towards an innovative model of the more versatile and flexible adapted to the current needs of a new curriculum and a new education for the citizens of the 21st century | [['this', 'article', 'has', 'as', 'its', 'main', 'objective', 'to', 'emphasize', 'the', 'importance', 'that', 'physical', 'spaces', 'and', 'architecture', 'should', 'have', 'for', 'a', 'correct', 'pedagogical', 'integration', 'of', 'the', 'ict', 'including', 'in', 'this', 'concept', 'all', 'the', 'current', 'means', 'of', 'communication', 'and', 'in', 'particular', 'the', 'emerging', 'technologies', 'not', 'only', 'is', 'it', 'because', 'as', 'has', 'been', 'demonstrated', 'learning', 'environments', 'have', 'a', 'decisive', 'impact', 'on', 'teaching', 'processes', 'and', 'students', 'own', 'learning', 'but', 'it', 'is', 'also', 'imperative', 'that', 'they', 'be', 'adapted', 'for', 'digital', 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1,802.06851 | Educational Research and Teaching Strategies in the Digital Society | To achieve digital literacy nowadays a media education is required. The
digital revolution breaks the barriers of space and time, and information has
become the most valuable commodity. The new digital reality favours the
convergence of all communicative media in existence and becomes the most
powerful instrument, resource, means and message in globalized society. In this
new reality education could be the catalyst of change, not only continuity. It
is imperative to break this tendency and analyze it in a real and critical way,
in all its complexity and dimensions. This is something which should be
essential in the formation of teaching professionals in search of an authentic
education for the needs of the contemporary world, and a fundamental pillar of
a correct literacy of a citizen of the 21st century. In this work we offer a
theoretical analysis of the educational research models and teaching strategies
in this question.
| physics.ed-ph | to achieve digital literacy nowadays a media education is required the digital revolution breaks the barriers of space and time and information has become the most valuable commodity the new digital reality favours the convergence of all communicative media in existence and becomes the most powerful instrument resource means and message in globalized society in this new reality education could be the catalyst of change not only continuity it is imperative to break this tendency and analyze it in a real and critical way in all its complexity and dimensions this is something which should be essential in the formation of teaching professionals in search of an authentic education for the needs of the contemporary world and a fundamental pillar of a correct literacy of a citizen of the 21st century in this work we offer a theoretical analysis of the educational research models and teaching strategies in this question | [['to', 'achieve', 'digital', 'literacy', 'nowadays', 'a', 'media', 'education', 'is', 'required', 'the', 'digital', 'revolution', 'breaks', 'the', 'barriers', 'of', 'space', 'and', 'time', 'and', 'information', 'has', 'become', 'the', 'most', 'valuable', 'commodity', 'the', 'new', 'digital', 'reality', 'favours', 'the', 'convergence', 'of', 'all', 'communicative', 'media', 'in', 'existence', 'and', 'becomes', 'the', 'most', 'powerful', 'instrument', 'resource', 'means', 'and', 'message', 'in', 'globalized', 'society', 'in', 'this', 'new', 'reality', 'education', 'could', 'be', 'the', 'catalyst', 'of', 'change', 'not', 'only', 'continuity', 'it', 'is', 'imperative', 'to', 'break', 'this', 'tendency', 'and', 'analyze', 'it', 'in', 'a', 'real', 'and', 'critical', 'way', 'in', 'all', 'its', 'complexity', 'and', 'dimensions', 'this', 'is', 'something', 'which', 'should', 'be', 'essential', 'in', 'the', 'formation', 'of', 'teaching', 'professionals', 'in', 'search', 'of', 'an', 'authentic', 'education', 'for', 'the', 'needs', 'of', 'the', 'contemporary', 'world', 'and', 'a', 'fundamental', 'pillar', 'of', 'a', 'correct', 'literacy', 'of', 'a', 'citizen', 'of', 'the', '21st', 'century', 'in', 'this', 'work', 'we', 'offer', 'a', 'theoretical', 'analysis', 'of', 'the', 'educational', 'research', 'models', 'and', 'teaching', 'strategies', 'in', 'this', 'question']] | [-0.08284317715656167, 0.08709694976074388, -0.1283063383338352, 0.09882762234502783, -0.14556520476316412, -0.1145177488711973, 0.06596406548594436, 0.3461075922722618, -0.252154204309918, -0.3318663786351681, 0.1343781699364384, -0.25700552539899946, -0.1571767991098265, 0.2015897472621873, -0.12413993728347122, 0.013941249519508953, 0.011245339751864473, 0.0345395238014559, 0.003272785114434858, -0.30123206895776095, 0.28389275463297964, 0.0639351499484231, 0.33745539693317067, 0.08442838748140881, 0.046559114269912244, -0.0031215168659885725, -0.04366543340108668, -0.01987781644507777, -0.07477955570056413, 0.18054846346067885, 0.35292873943023245, 0.23322834049661953, 0.413367553340892, -0.4162735291942954, -0.17055761479229356, 0.09746950424586732, 0.1664169777239052, 0.10888676866500949, -0.08557956184570988, -0.2700750378434168, 0.03895223988220096, -0.17925498875478904, -0.14278051663190128, -0.05895509018873175, 0.029912353418767454, -0.04622219853103161, -0.1991936075128615, 0.008244474977254867, 0.04237471555359661, 0.14287452132130662, -0.032357038884268455, -0.06199340078514069, -0.015362116770508388, 0.2282088988274336, 0.04982312296982855, 0.047249918580831336, 0.11004840456570188, -0.19208171568500498, -0.11601351549538473, 0.4534639962017536, 0.02144081386582305, -0.13167224587562185, 0.20006032292149029, -0.14393827179369206, -0.13826177950948476, 0.0598891175177414, 0.20895329418902595, 0.06401557958374421, -0.17728838119034965, 0.07450377228393336, 0.01011444191603611, 0.18530397394982476, 0.030944637190550565, 0.02891907896225651, 0.23987337260196606, 0.2441736535076052, 0.0780411082226783, 0.05671723790001124, -0.001954503580927849, -0.10986436844492951, -0.24651778280890235, -0.26679512972012165, -0.1532671058829874, 0.0347353955724005, -0.06405598899029429, -0.14270344158634543, 0.37626101983943955, 0.17178841253121693, 0.07760975838095571, -0.020825076738838107, 0.32990328105942657, 0.060099260850499076, 0.09631355425653358, 0.08691830223736664, 0.23560147990569627, 0.041178036640242985, 0.23075242315108577, -0.1088326337840408, 0.11562801144085824, -0.02715314714354463] |
1,802.06852 | Be-Educated: Multimedia Learning through 3D Animation | Multimedia learning tools and techniques are placing its importance with
large scale in education sector. With the help of multimedia learning, various
complex phenomenon and theories can be explained and taught easily and
conveniently. This project aims to teach and spread the importance of education
and respecting the tools of education: pen, paper, pencil, rubber. To achieve
this cognitive learning, a 3D animated movie has been developed using
principles of multimedia learning with 3D cartoon characters resembling the
actual educational objects, where the buildings have also been modelled to
resemble real books and diaries. For modelling and animation of these
characters, polygon mesh tools are used in 3D Studio Max. Additionally, the
final composition of video and audio is performed in adobe premiere. This 3D
animated video aims to highlight a message of importance for education and
stationary. The Moral of movie is that do not waste your stationary material,
use your Pen and Paper for the purpose they are made for. To be a good citizen
you have to Be-Educated yourself and for that you need to give value to Pen.
The final rendered and composited 3D animated video reflects this moral and
portrays the intended message with very vibrant visuals
| cs.GR cs.MM | multimedia learning tools and techniques are placing its importance with large scale in education sector with the help of multimedia learning various complex phenomenon and theories can be explained and taught easily and conveniently this project aims to teach and spread the importance of education and respecting the tools of education pen paper pencil rubber to achieve this cognitive learning a 3d animated movie has been developed using principles of multimedia learning with 3d cartoon characters resembling the actual educational objects where the buildings have also been modelled to resemble real books and diaries for modelling and animation of these characters polygon mesh tools are used in 3d studio max additionally the final composition of video and audio is performed in adobe premiere this 3d animated video aims to highlight a message of importance for education and stationary the moral of movie is that do not waste your stationary material use your pen and paper for the purpose they are made for to be a good citizen you have to beeducated yourself and for that you need to give value to pen the final rendered and composited 3d animated video reflects this moral and portrays the intended message with very vibrant visuals | [['multimedia', 'learning', 'tools', 'and', 'techniques', 'are', 'placing', 'its', 'importance', 'with', 'large', 'scale', 'in', 'education', 'sector', 'with', 'the', 'help', 'of', 'multimedia', 'learning', 'various', 'complex', 'phenomenon', 'and', 'theories', 'can', 'be', 'explained', 'and', 'taught', 'easily', 'and', 'conveniently', 'this', 'project', 'aims', 'to', 'teach', 'and', 'spread', 'the', 'importance', 'of', 'education', 'and', 'respecting', 'the', 'tools', 'of', 'education', 'pen', 'paper', 'pencil', 'rubber', 'to', 'achieve', 'this', 'cognitive', 'learning', 'a', '3d', 'animated', 'movie', 'has', 'been', 'developed', 'using', 'principles', 'of', 'multimedia', 'learning', 'with', '3d', 'cartoon', 'characters', 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1,802.06853 | Professional Practice in Higher Education: A Case Study in Faculty
Training and Development in Brazil | One of the most important debates is currently focusing on specifying the
training that university teachers must receive for their professional practice.
Improving it in higher education is extremely important not only for the
scientific production generated by university but also for the adequacy of the
training that future graduates will be offered; professionals facing an
increasingly demanding labour market with new needs. University teachers
training, thus, should be a priority in academic policies due to their
influence and the role played in the evolution of society, as well as being the
basis of the quality of Higher Education. This research, a case study in the
State of Goias (Brazil), is focused on a sample of practicing university
teachers from different fields of knowledge, and has as main objective to know
the characteristics of the training received for their professional practice,
both in the field of scientific education and their educational role and
ability to transfer knowledge. The methodology used has been mixed, not
experimental and descriptive, with the help of instruments for data collection
and analysis of quantitative and qualitative nature (questionnaires,
interviews, monitoring, checklists, documentary analysis, etc.). The results
confirmed the initial hypothesis, which stated that university teachers current
training is primarily scientific and technical, and has gaps in the teacher
training required today for a more effective work in the classroom. In this
area teachers often use teaching methodologies supported by previous
experiences with traditional features. Finally, to optimize this situation,
different strategies for university teachers training are proposed seeking to
improve both their reflection and teaching practice.
| physics.ed-ph | one of the most important debates is currently focusing on specifying the training that university teachers must receive for their professional practice improving it in higher education is extremely important not only for the scientific production generated by university but also for the adequacy of the training that future graduates will be offered professionals facing an increasingly demanding labour market with new needs university teachers training thus should be a priority in academic policies due to their influence and the role played in the evolution of society as well as being the basis of the quality of higher education this research a case study in the state of goias brazil is focused on a sample of practicing university teachers from different fields of knowledge and has as main objective to know the characteristics of the training received for their professional practice both in the field of scientific education and their educational role and ability to transfer knowledge the methodology used has been mixed not experimental and descriptive with the help of instruments for data collection and analysis of quantitative and qualitative nature questionnaires interviews monitoring checklists documentary analysis etc the results confirmed the initial hypothesis which stated that university teachers current training is primarily scientific and technical and has gaps in the teacher training required today for a more effective work in the classroom in this area teachers often use teaching methodologies supported by previous experiences with traditional features finally to optimize this situation different strategies for university teachers training are proposed seeking to improve both their reflection and teaching practice | [['one', 'of', 'the', 'most', 'important', 'debates', 'is', 'currently', 'focusing', 'on', 'specifying', 'the', 'training', 'that', 'university', 'teachers', 'must', 'receive', 'for', 'their', 'professional', 'practice', 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1,802.06854 | Magnetic monopoles in noncommutative quantum mechanics 2 | In this paper we extend the analysis of magnetic monopoles in quantum
mechanics in three dimensional rotationally invariant noncommutative space
$\textbf{R}^3_\lambda$. We construct the model step-by-step and observe that
physical objects known from previous studies appear in a very natural way.
Nonassociativity became a topic of great interest lately, often in a connection
with magnetic monopoles. We show that this model does not possess this
property.
| math-ph hep-th math.MP | in this paper we extend the analysis of magnetic monopoles in quantum mechanics in three dimensional rotationally invariant noncommutative space textbfr3_lambda we construct the model stepbystep and observe that physical objects known from previous studies appear in a very natural way nonassociativity became a topic of great interest lately often in a connection with magnetic monopoles we show that this model does not possess this property | [['in', 'this', 'paper', 'we', 'extend', 'the', 'analysis', 'of', 'magnetic', 'monopoles', 'in', 'quantum', 'mechanics', 'in', 'three', 'dimensional', 'rotationally', 'invariant', 'noncommutative', 'space', 'textbfr3_lambda', 'we', 'construct', 'the', 'model', 'stepbystep', 'and', 'observe', 'that', 'physical', 'objects', 'known', 'from', 'previous', 'studies', 'appear', 'in', 'a', 'very', 'natural', 'way', 'nonassociativity', 'became', 'a', 'topic', 'of', 'great', 'interest', 'lately', 'often', 'in', 'a', 'connection', 'with', 'magnetic', 'monopoles', 'we', 'show', 'that', 'this', 'model', 'does', 'not', 'possess', 'this', 'property']] | [-0.11698753813711496, 0.14622566191336284, -0.10826861838308664, 0.09772521403725618, -0.09781674725505021, -0.09359460443688127, -0.0050140957545059235, 0.4105627382890536, -0.22566409472089546, -0.30435839066138637, 0.04889688288721328, -0.21077772196955405, -0.24565069096592757, 0.15940422592684628, -0.13271393429201384, 0.002811827009113935, 0.03819407666675173, 0.06171890339599206, -0.08743975359516648, -0.2149217996889582, 0.3269855447973196, 0.013044540173947239, 0.2786446079540138, 0.022033757544480836, 0.0648053727327631, -0.024208778830674977, -0.03638116725935386, 0.04748331662222671, -0.13596219252190517, 0.10590608647236457, 0.2543241263868717, 0.06859707087278366, 0.24606126963805694, -0.4222813531756401, -0.24446776057951725, 0.1373811243692986, 0.15990845325331277, 0.13662294349991358, -0.11052243533329321, -0.2532999550780425, 0.046057281241967125, -0.17801882601701297, -0.14108233007674034, -0.1270224105853301, 0.025357490183355716, -0.05822483974580581, -0.18936489381325933, 0.0406578304246068, 0.14958098106659376, 0.08064693010483796, -0.06828470124075046, -0.033689663673822694, 0.024222613090219405, 0.07379651937562112, 0.08081321896483692, 0.04000078226224734, 0.07294414667412638, -0.11318410242014439, -0.1472790276004861, 0.4013481660817678, -0.029003194232399648, -0.21634165103045794, 0.22040383932538904, -0.19791478016055547, -0.25833297656275905, 0.07642902516258451, 0.15144265047632732, 0.14570226091891528, -0.13275127456021996, 0.14653915274225604, -0.11654529537145908, 0.1309786610878431, 0.02541341914866979, 0.06479781817358274, 0.2708613793437298, 0.135678767799758, 0.029529225568358713, 0.139743159740017, -0.03487393263584146, -0.14228114733615746, -0.295906144925035, -0.1817065258599961, -0.1690731780245327, 0.09499893241691797, -0.007819660115190065, -0.18976148454329142, 0.3633936844407939, 0.19870305380407863, 0.22516429252349413, -0.020096700495252244, 0.24981223468023997, 0.05367328932938668, 0.08745509674056218, 0.05677885113713833, 0.2580397091519374, 0.1422254075940985, 0.15803038211396106, -0.10720121689642279, -0.0317322185379453, 0.060997914107373125] |
1,802.06855 | Comets in UV | Comets are important "eyewitnesses" of Solar System formation and evolution.
Important tests to determine the chemical composition and to study the physical
processes in cometary nuclei and coma need data in the UV range of the
electromagnetic spectrum. Comprehensive and complete studies require for
additional ground-based observations and in-situ experiments. We briefly review
observations of comets in the ultraviolet (UV) and discuss the prospects of UV
observations of comets and exocomets with space-born instruments. A special
refer is made to the World Space Observatory-Ultraviolet (WSO-UV) project.
| astro-ph.EP | comets are important eyewitnesses of solar system formation and evolution important tests to determine the chemical composition and to study the physical processes in cometary nuclei and coma need data in the uv range of the electromagnetic spectrum comprehensive and complete studies require for additional groundbased observations and insitu experiments we briefly review observations of comets in the ultraviolet uv and discuss the prospects of uv observations of comets and exocomets with spaceborn instruments a special refer is made to the world space observatoryultraviolet wsouv project | [['comets', 'are', 'important', 'eyewitnesses', 'of', 'solar', 'system', 'formation', 'and', 'evolution', 'important', 'tests', 'to', 'determine', 'the', 'chemical', 'composition', 'and', 'to', 'study', 'the', 'physical', 'processes', 'in', 'cometary', 'nuclei', 'and', 'coma', 'need', 'data', 'in', 'the', 'uv', 'range', 'of', 'the', 'electromagnetic', 'spectrum', 'comprehensive', 'and', 'complete', 'studies', 'require', 'for', 'additional', 'groundbased', 'observations', 'and', 'insitu', 'experiments', 'we', 'briefly', 'review', 'observations', 'of', 'comets', 'in', 'the', 'ultraviolet', 'uv', 'and', 'discuss', 'the', 'prospects', 'of', 'uv', 'observations', 'of', 'comets', 'and', 'exocomets', 'with', 'spaceborn', 'instruments', 'a', 'special', 'refer', 'is', 'made', 'to', 'the', 'world', 'space', 'observatoryultraviolet', 'wsouv', 'project']] | [-0.05027902999156436, 0.1433463957442274, -0.046816426513413355, 0.09029560972162154, -0.06902677591261995, -0.03184143859394934, 0.035722786744753286, 0.4252107098135491, -0.14092495326537552, -0.3501338548525128, 0.1318119347195661, -0.29886510464915095, -0.11933889587715724, 0.18755675529584634, -0.07046933441834394, 0.05796712798846149, 0.10777625326760286, -0.09619810962020744, -0.015962196348863113, -0.2286421376778636, 0.28724914818439024, 0.14510401889010396, 0.1248960496944397, 0.023534817945991836, 0.027155081201398874, -0.03699905735841238, -0.14004730445543997, -0.07750713313573722, -0.18944361326176412, 0.0899806795970044, 0.2636026137530111, 0.2124497497882044, 0.18799268998757956, -0.45379882931795923, -0.2508222478398577, 0.06279580185709652, 0.09498967674864066, 0.0033894253239512098, -0.04313768078248168, -0.2765204853833068, -0.03258297396390591, -0.13067935779690742, -0.21069294863196394, -0.010348805697461548, 0.0586292052446583, 0.04280918634897315, -0.24002265354055305, -0.022546011345396036, -0.04023248263158251, 0.13467152843381777, -0.1706992322592563, -0.10560054892841943, -0.03375020003769287, 0.14393189320405728, 0.06265450590344276, -0.0031247713446054, 0.17696391523079297, -0.12353721936774809, -0.07680810522829551, 0.4298630286939442, -0.07717793648263852, 0.019026538227186647, 0.2357186230568237, -0.22720640291308247, -0.2194464013987589, 0.11837398451563447, 0.17865766907587302, 0.10218592612939172, -0.18790818371831677, 0.08573183492110327, -0.01462337780245688, 0.14541524494889863, 0.0068238283653721905, 0.1379732578711281, 0.285992665308376, 0.17519277693747087, -0.010721068011683434, 0.09017389546538335, -0.15680335706836263, -0.02373730561639816, -0.28590869247306916, -0.16582344608857882, -0.09235163669231845, 0.05201455419558252, -0.05409728221292066, -0.10142794901472625, 0.34499700000336353, 0.17357708506156191, 0.17130818501450554, -0.04394242776081313, 0.31270262971520424, -0.020275393338484125, 0.07803873924625128, 0.024044379640673828, 0.3240006236619381, 0.08968360481653796, 0.13802511396622935, -0.20607569132021866, 0.04997812889971186, -0.02433800629101867] |
1,802.06856 | The Habitable Zone of Kepler-16: Impact of Binarity and Climate Models | We continue to investigate the binary system Kepler-16, consisting of a
K-type main-sequence star, a red dwarf, and a circumbinary Saturnian planet. As
part of our study, we describe the system's habitable zone based on different
climate models. We also report on stability investigations for possible
Earth-mass Trojans while expanding a previous study by B. L. Quarles and
collaborators given in 2012. For the climate models we carefully consider the
relevance of the system's parameters. Furthermore, we pursue new stability
simulations for the Earth-mass objects starting along the orbit of Kepler-16b.
The eccentricity distribution as obtained prefers values close to circular,
whereas the inclination distribution remains flat. The stable solutions are
distributed near the co-orbital Lagrangian points, thus enhancing the
plausibility that Earth-mass Trojans might be able to exist in the
Kepler-16(AB) system.
| astro-ph.EP astro-ph.SR | we continue to investigate the binary system kepler16 consisting of a ktype mainsequence star a red dwarf and a circumbinary saturnian planet as part of our study we describe the systems habitable zone based on different climate models we also report on stability investigations for possible earthmass trojans while expanding a previous study by b l quarles and collaborators given in 2012 for the climate models we carefully consider the relevance of the systems parameters furthermore we pursue new stability simulations for the earthmass objects starting along the orbit of kepler16b the eccentricity distribution as obtained prefers values close to circular whereas the inclination distribution remains flat the stable solutions are distributed near the coorbital lagrangian points thus enhancing the plausibility that earthmass trojans might be able to exist in the kepler16ab system | [['we', 'continue', 'to', 'investigate', 'the', 'binary', 'system', 'kepler16', 'consisting', 'of', 'a', 'ktype', 'mainsequence', 'star', 'a', 'red', 'dwarf', 'and', 'a', 'circumbinary', 'saturnian', 'planet', 'as', 'part', 'of', 'our', 'study', 'we', 'describe', 'the', 'systems', 'habitable', 'zone', 'based', 'on', 'different', 'climate', 'models', 'we', 'also', 'report', 'on', 'stability', 'investigations', 'for', 'possible', 'earthmass', 'trojans', 'while', 'expanding', 'a', 'previous', 'study', 'by', 'b', 'l', 'quarles', 'and', 'collaborators', 'given', 'in', '2012', 'for', 'the', 'climate', 'models', 'we', 'carefully', 'consider', 'the', 'relevance', 'of', 'the', 'systems', 'parameters', 'furthermore', 'we', 'pursue', 'new', 'stability', 'simulations', 'for', 'the', 'earthmass', 'objects', 'starting', 'along', 'the', 'orbit', 'of', 'kepler16b', 'the', 'eccentricity', 'distribution', 'as', 'obtained', 'prefers', 'values', 'close', 'to', 'circular', 'whereas', 'the', 'inclination', 'distribution', 'remains', 'flat', 'the', 'stable', 'solutions', 'are', 'distributed', 'near', 'the', 'coorbital', 'lagrangian', 'points', 'thus', 'enhancing', 'the', 'plausibility', 'that', 'earthmass', 'trojans', 'might', 'be', 'able', 'to', 'exist', 'in', 'the', 'kepler16ab', 'system']] | [-0.16686060507499584, 0.105267999376255, -0.0673058786320105, 0.05233771943533087, -0.07514403124029438, -0.06731040357386298, 0.10415769389576533, 0.3298968858029129, -0.16573335015864082, -0.30165893429533974, 0.10930628103916674, -0.26136191266899306, -0.1363544762134552, 0.18109457999834735, -0.10615223268696079, 0.05914442644246843, 0.14954661667015348, -0.02538609234122277, -0.04104247537419393, -0.24765323401097153, 0.31789890529365616, 0.06777006476609544, 0.06718896681823852, -0.061559837544336915, 0.025522029348366865, -0.04407985588168782, 0.015021083072166552, -0.04893913326051199, -0.21379254172252055, 0.06159445874869341, 0.21495819997967788, 0.10847734423904595, 0.23451256871957218, -0.3689746976068074, -0.2296827431930455, 0.091317400115782, 0.15419403730298986, 0.06219190982786434, -0.03538164359722004, -0.2969559375364263, 0.1299833263231752, -0.21231741841995355, -0.2296184059585247, -0.03375445944821519, 0.09845349152050348, 0.011701924383735539, -0.24911062214276614, 0.04520327231478983, 0.10789254905698313, 0.11427997805047639, -0.16595864157319407, -0.13775766348628554, -0.0848346163261202, 0.1043627228686863, 0.017392459669446744, -0.018278347257750505, 0.17267930582447938, -0.06611484009904829, -0.07330159847906818, 0.399648030147408, -0.09844280614616406, -0.10834378822509086, 0.26320310207401315, -0.17097371919821439, -0.11787148536126496, 0.08547948879034568, 0.22590488173900117, 0.16132445399522444, -0.13408670745521897, 0.04058495701456471, -0.040809214880661755, 0.16572153161343356, 0.0862764236323225, 0.0006419002875742135, 0.4062092126872757, 0.16984819592890385, 0.07854947328010123, 0.10098740357506993, -0.158842200014712, -0.11321050698108703, -0.20047006683395893, -0.12306386856961939, -0.12432803860406927, 0.007401532176035372, -0.04887466986683924, -0.14088910577155536, 0.3886924918430547, 0.18867300274414997, 0.21965726124560178, 0.040186033178487734, 0.2748157223739492, 0.046161409604158536, 0.04403873589674759, 0.11177700287733001, 0.327180672324065, 0.09503050362620728, 0.08026196032402698, -0.22855722095251127, 0.07345337189547012, 0.012995193797079] |
1,802.06857 | Global Pose Estimation with an Attention-based Recurrent Network | The ability for an agent to localize itself within an environment is crucial
for many real-world applications. For unknown environments, Simultaneous
Localization and Mapping (SLAM) enables incremental and concurrent building of
and localizing within a map. We present a new, differentiable architecture,
Neural Graph Optimizer, progressing towards a complete neural network solution
for SLAM by designing a system composed of a local pose estimation model, a
novel pose selection module, and a novel graph optimization process. The entire
architecture is trained in an end-to-end fashion, enabling the network to
automatically learn domain-specific features relevant to the visual odometry
and avoid the involved process of feature engineering. We demonstrate the
effectiveness of our system on a simulated 2D maze and the 3D ViZ-Doom
environment.
| cs.CV cs.LG cs.RO | the ability for an agent to localize itself within an environment is crucial for many realworld applications for unknown environments simultaneous localization and mapping slam enables incremental and concurrent building of and localizing within a map we present a new differentiable architecture neural graph optimizer progressing towards a complete neural network solution for slam by designing a system composed of a local pose estimation model a novel pose selection module and a novel graph optimization process the entire architecture is trained in an endtoend fashion enabling the network to automatically learn domainspecific features relevant to the visual odometry and avoid the involved process of feature engineering we demonstrate the effectiveness of our system on a simulated 2d maze and the 3d vizdoom environment | [['the', 'ability', 'for', 'an', 'agent', 'to', 'localize', 'itself', 'within', 'an', 'environment', 'is', 'crucial', 'for', 'many', 'realworld', 'applications', 'for', 'unknown', 'environments', 'simultaneous', 'localization', 'and', 'mapping', 'slam', 'enables', 'incremental', 'and', 'concurrent', 'building', 'of', 'and', 'localizing', 'within', 'a', 'map', 'we', 'present', 'a', 'new', 'differentiable', 'architecture', 'neural', 'graph', 'optimizer', 'progressing', 'towards', 'a', 'complete', 'neural', 'network', 'solution', 'for', 'slam', 'by', 'designing', 'a', 'system', 'composed', 'of', 'a', 'local', 'pose', 'estimation', 'model', 'a', 'novel', 'pose', 'selection', 'module', 'and', 'a', 'novel', 'graph', 'optimization', 'process', 'the', 'entire', 'architecture', 'is', 'trained', 'in', 'an', 'endtoend', 'fashion', 'enabling', 'the', 'network', 'to', 'automatically', 'learn', 'domainspecific', 'features', 'relevant', 'to', 'the', 'visual', 'odometry', 'and', 'avoid', 'the', 'involved', 'process', 'of', 'feature', 'engineering', 'we', 'demonstrate', 'the', 'effectiveness', 'of', 'our', 'system', 'on', 'a', 'simulated', '2d', 'maze', 'and', 'the', '3d', 'vizdoom', 'environment']] | [-0.09973744411074473, -0.05851549780191721, -0.033898145268951366, -0.0024886935932703254, -0.10698935693523627, -0.185781829755723, 0.01888005754141879, 0.46610864500204724, -0.3135551091556142, -0.32050139358554913, 0.07454650445057578, -0.20189946485641677, -0.25027021543857286, 0.18103167611908744, -0.13427987264235786, 0.1255600354142063, 0.1395301702337688, 0.01040547106621363, -0.042133587414429075, -0.19074710013157484, 0.27882115489886544, 0.05188751818112484, 0.29176805187319593, -0.0004946688015952827, 0.19663374878397985, 0.052290412680647234, -0.0012860634417189815, -0.026297334522932647, -0.015320866375336258, 0.19989415485321022, 0.30961611108642406, 0.21848381949565943, 0.336434840762276, -0.4232837758140593, -0.235641482041967, 0.0695327241087287, 0.15297815209345483, 0.0958860207862993, -0.07136261670157404, -0.3995954636181515, 0.07985309480662965, -0.15835564787243114, -0.04082013101021691, -0.12541961412483116, -0.006210066182671372, -0.04551629253428399, -0.3252928391921455, -0.043217048147405554, 0.06084103798810809, 0.04877637126634458, -0.0823645814382509, -0.016311687222356354, 0.02474341130573151, 0.22967289510841776, -0.08450821417098017, 0.09221537406291298, 0.21027118564257777, -0.20428845537182821, -0.12577139894001005, 0.3635549902522225, -0.012319086770227982, -0.20176836596309713, 0.22891990158979486, 0.0404325223156834, -0.16988434938607905, 0.13585146621429944, 0.26774670553916113, 0.12824195538973057, -0.22157422552354694, 0.0378592142095123, -0.034062127476724664, 0.19799452748460075, -0.0488565717445217, -0.03811720028761926, 0.2218592082163531, 0.3163119257405037, 0.11211042155036552, 0.15782353946772532, -0.11148329711201169, -0.05848838078478972, -0.23070265932720366, -0.15707163306755748, -0.18661572815608082, -0.04313341208461036, -0.10812436936709961, -0.17607394127306297, 0.44755680613764903, 0.2524423197941567, 0.22159607360533218, 0.11357295075507183, 0.35676362241307896, 0.016486494742311175, 0.09364038434379347, 0.09668690094731869, 0.14060594084837316, -0.004154462973034479, 0.13778750886534893, -0.17866050045960014, 0.09404180675926732, 0.08604894627294526] |
1,802.06858 | Congestion analysis of unsignalized intersections | This paper considers an unsignalized intersection used by two traffic
streams. A stream of cars is using a primary road, and has priority over the
other, low-priority, stream. Cars belonging to the latter stream cross the
primary road if the gaps between two subsequent cars on the primary road is
larger than their critical headways. Questions that naturally arise are: given
the arrival pattern of the cars on the primary road, what is the maximum
arrival rate of low-priority cars such that the number of such cars remains
stable? In the second place, what can be said about the delay experienced by a
typical car at the secondary road? This paper addresses such issues by
considering a compact model that sheds light on the dynamics of the considered
unsignalized intersection. The model, which is of a queueing-theoretic nature,
reveals interesting insights into the impact of the user behavior on the above
stability and delay issues. The contribution of this paper is twofold. First,
we obtain new results for the aforementioned model with driver impatience.
Secondly, we reveal some surprising aspects that have remained unobserved in
the existing literature so far, many of which are caused by the fact that the
capacity of the minor road cannot be expressed in terms of the \emph{mean} gap
size; instead more detailed characteristics of the critical headway
distribution play a role.
| math.OC math.PR physics.soc-ph | this paper considers an unsignalized intersection used by two traffic streams a stream of cars is using a primary road and has priority over the other lowpriority stream cars belonging to the latter stream cross the primary road if the gaps between two subsequent cars on the primary road is larger than their critical headways questions that naturally arise are given the arrival pattern of the cars on the primary road what is the maximum arrival rate of lowpriority cars such that the number of such cars remains stable in the second place what can be said about the delay experienced by a typical car at the secondary road this paper addresses such issues by considering a compact model that sheds light on the dynamics of the considered unsignalized intersection the model which is of a queueingtheoretic nature reveals interesting insights into the impact of the user behavior on the above stability and delay issues the contribution of this paper is twofold first we obtain new results for the aforementioned model with driver impatience secondly we reveal some surprising aspects that have remained unobserved in the existing literature so far many of which are caused by the fact that the capacity of the minor road cannot be expressed in terms of the emphmean gap size instead more detailed characteristics of the critical headway distribution play a role | [['this', 'paper', 'considers', 'an', 'unsignalized', 'intersection', 'used', 'by', 'two', 'traffic', 'streams', 'a', 'stream', 'of', 'cars', 'is', 'using', 'a', 'primary', 'road', 'and', 'has', 'priority', 'over', 'the', 'other', 'lowpriority', 'stream', 'cars', 'belonging', 'to', 'the', 'latter', 'stream', 'cross', 'the', 'primary', 'road', 'if', 'the', 'gaps', 'between', 'two', 'subsequent', 'cars', 'on', 'the', 'primary', 'road', 'is', 'larger', 'than', 'their', 'critical', 'headways', 'questions', 'that', 'naturally', 'arise', 'are', 'given', 'the', 'arrival', 'pattern', 'of', 'the', 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1,802.06859 | Maximum value of the standardized log of odds ratio and celestial
mechanics | The odds ratio (OR) is a widely used measure of the effect size in
observational research. ORs reflect statistical association between a binary
outcome, such as the presence of a health condition, and a binary predictor,
such as an exposure to a pollutant. Statistical significance and interval
estimates are often computed for the logarithm of OR, ln(OR), and depend on the
asymptotic standard error of ln(OR). For a sample of size N, the standard error
can be written as a ratio of sigma over square root of N, where sigma is the
population standard deviation of ln(OR). The ratio of ln(OR) over sigma is a
standardized effect size. Unlike correlation, that is another familiar
standardized statistic, the standardized ln(OR) cannot reach values of minus
one or one. We find that its maximum possible value is given by the Laplace
Limit Constant, (LLC=0.6627...), that appears as a condition in solutions to
Kepler equation -- one of the central equations in celestial mechanics. The
range of the standardized ln(OR) is bounded by minus LLC to LLC, reaching its
maximum for ln(OR)~4.7987. This range has implications for analysis of
epidemiological associations, affecting the behavior of the reasonable prior
distribution for the standardized ln(OR).
| stat.ME | the odds ratio or is a widely used measure of the effect size in observational research ors reflect statistical association between a binary outcome such as the presence of a health condition and a binary predictor such as an exposure to a pollutant statistical significance and interval estimates are often computed for the logarithm of or lnor and depend on the asymptotic standard error of lnor for a sample of size n the standard error can be written as a ratio of sigma over square root of n where sigma is the population standard deviation of lnor the ratio of lnor over sigma is a standardized effect size unlike correlation that is another familiar standardized statistic the standardized lnor cannot reach values of minus one or one we find that its maximum possible value is given by the laplace limit constant llc06627 that appears as a condition in solutions to kepler equation one of the central equations in celestial mechanics the range of the standardized lnor is bounded by minus llc to llc reaching its maximum for lnor47987 this range has implications for analysis of epidemiological associations affecting the behavior of the reasonable prior distribution for the standardized lnor | [['the', 'odds', 'ratio', 'or', 'is', 'a', 'widely', 'used', 'measure', 'of', 'the', 'effect', 'size', 'in', 'observational', 'research', 'ors', 'reflect', 'statistical', 'association', 'between', 'a', 'binary', 'outcome', 'such', 'as', 'the', 'presence', 'of', 'a', 'health', 'condition', 'and', 'a', 'binary', 'predictor', 'such', 'as', 'an', 'exposure', 'to', 'a', 'pollutant', 'statistical', 'significance', 'and', 'interval', 'estimates', 'are', 'often', 'computed', 'for', 'the', 'logarithm', 'of', 'or', 'lnor', 'and', 'depend', 'on', 'the', 'asymptotic', 'standard', 'error', 'of', 'lnor', 'for', 'a', 'sample', 'of', 'size', 'n', 'the', 'standard', 'error', 'can', 'be', 'written', 'as', 'a', 'ratio', 'of', 'sigma', 'over', 'square', 'root', 'of', 'n', 'where', 'sigma', 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