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1,802.0726 | Deep Learning Classification in Asteroseismology Using an Improved
Neural Network: Results on 15000 Kepler Red Giants and Applications to K2 and
TESS Data | Deep learning in the form of 1D convolutional neural networks have previously
been shown to be capable of efficiently classifying the evolutionary state of
oscillating red giants into red giant branch stars and helium-core burning
stars by recognizing visual features in their asteroseismic frequency spectra.
We elaborate further on the deep learning method by developing an improved
convolutional neural network classifier. To make our method useful for current
and future space missions such as K2, TESS and PLATO, we train classifiers that
are able to classify the evolutionary states of lower frequency resolution
spectra expected from these missions. Additionally, we provide new
classifications for 8633 Kepler red giants, out of which 426 have previously
not been classified using asteroseismology. This brings the total to 14983
Kepler red giants classified with our new neural network. We also verify that
our classifiers are remarkably robust to suboptimal data, including low
signal-to-noise and incorrect training truth labels.
| astro-ph.IM astro-ph.SR | deep learning in the form of 1d convolutional neural networks have previously been shown to be capable of efficiently classifying the evolutionary state of oscillating red giants into red giant branch stars and heliumcore burning stars by recognizing visual features in their asteroseismic frequency spectra we elaborate further on the deep learning method by developing an improved convolutional neural network classifier to make our method useful for current and future space missions such as k2 tess and plato we train classifiers that are able to classify the evolutionary states of lower frequency resolution spectra expected from these missions additionally we provide new classifications for 8633 kepler red giants out of which 426 have previously not been classified using asteroseismology this brings the total to 14983 kepler red giants classified with our new neural network we also verify that our classifiers are remarkably robust to suboptimal data including low signaltonoise and incorrect training truth labels | [['deep', 'learning', 'in', 'the', 'form', 'of', '1d', 'convolutional', 'neural', 'networks', 'have', 'previously', 'been', 'shown', 'to', 'be', 'capable', 'of', 'efficiently', 'classifying', 'the', 'evolutionary', 'state', 'of', 'oscillating', 'red', 'giants', 'into', 'red', 'giant', 'branch', 'stars', 'and', 'heliumcore', 'burning', 'stars', 'by', 'recognizing', 'visual', 'features', 'in', 'their', 'asteroseismic', 'frequency', 'spectra', 'we', 'elaborate', 'further', 'on', 'the', 'deep', 'learning', 'method', 'by', 'developing', 'an', 'improved', 'convolutional', 'neural', 'network', 'classifier', 'to', 'make', 'our', 'method', 'useful', 'for', 'current', 'and', 'future', 'space', 'missions', 'such', 'as', 'k2', 'tess', 'and', 'plato', 'we', 'train', 'classifiers', 'that', 'are', 'able', 'to', 'classify', 'the', 'evolutionary', 'states', 'of', 'lower', 'frequency', 'resolution', 'spectra', 'expected', 'from', 'these', 'missions', 'additionally', 'we', 'provide', 'new', 'classifications', 'for', '8633', 'kepler', 'red', 'giants', 'out', 'of', 'which', '426', 'have', 'previously', 'not', 'been', 'classified', 'using', 'asteroseismology', 'this', 'brings', 'the', 'total', 'to', '14983', 'kepler', 'red', 'giants', 'classified', 'with', 'our', 'new', 'neural', 'network', 'we', 'also', 'verify', 'that', 'our', 'classifiers', 'are', 'remarkably', 'robust', 'to', 'suboptimal', 'data', 'including', 'low', 'signaltonoise', 'and', 'incorrect', 'training', 'truth', 'labels']] | [-0.00014608959272185244, 0.08804362568490003, -0.10122512577493724, 0.08982262080519975, -0.16874897462242333, -0.140415275402024, 0.10178816984530147, 0.46968023709364626, -0.18946247021047288, -0.355983964979379, 0.041293261871415826, -0.2806614215736964, -0.18731624935753644, 0.23219038807665607, -0.15272669409291426, 0.08066900416375383, 0.17962090759369617, -0.0015210368650227075, -0.006947739567534116, -0.3560800056201467, 0.2855283315048406, 0.034482213049302934, 0.21837855226017142, -0.12046673224540427, 0.024696707891723093, -0.14288633956886387, -0.04038103098834032, -0.03463547290658952, -0.10665815318105543, 0.11702092032148932, 0.33977823443925254, 0.22035517890349424, 0.271391699740075, -0.37915450493854125, -0.2479145225921744, 0.09919486632019184, 0.21017144704053767, 0.10254730904508554, -0.016169034542767087, -0.38171510145950477, 0.1110662906840413, -0.1759597951129667, -0.0718589160395296, -0.17785127601267672, 0.03231740055765074, 0.026988467111215487, -0.21762200433601575, -0.008084981445120465, 0.06958555559456152, 0.10340962951120578, -0.1198861438054959, -0.19982442056368055, -0.06482775294142284, 0.1721949686087962, -0.020357615999895835, 0.0385505429447604, 0.06216199800531429, -0.15751682111754475, -0.061481329989251925, 0.3005384490457608, -0.08615170560446322, -0.06725208589341491, 0.1963274639397002, -0.0612468050948289, -0.18324361058981403, 0.10448725869585025, 0.21807444993234976, 0.13525573210790753, -0.18516714485380553, -0.06823522468556276, 0.014866406404364266, 0.16802530887683756, 0.08245401274931091, 0.04936671681054194, 0.2848203270205934, 0.24914036968134737, 0.02050435980230472, 0.10521047438746073, -0.22727738491008304, -0.0003117740056232402, -0.16884208868233194, -0.07078463196950524, -0.161550466651342, 0.030353866001429485, -0.09411599354337484, -0.14451989806069546, 0.3652121361188428, 0.1800812392213725, 0.21015291026866945, 0.0988575751337186, 0.3421696781312532, 0.06756885273467847, 0.162399343397211, 0.1089760615615983, 0.30797927248242657, 0.12130410859581868, 0.1159359569397853, -0.2029265649019324, 0.02769403137867094, 0.033833070103642775] |
1,802.07261 | The Mathematics of Human Contact: Developing a Model for Social
Interaction in School Children | In this paper, we provide a statistical analysis of high-resolution contact
pattern data within primary and secondary schools as collected by the
SocioPatterns collaboration. Students are graphically represented as nodes in a
temporally evolving network, in which links represent proximity or interaction
between students. This article focuses on link- and node-level statistics, such
as the on- and off-durations of links as well as the activity potential of
nodes and links. Parametric models are fitted to the on- and off-durations of
links, inter-event times and node activity potentials and, based on these, we
propose a number of theoretical models that are able to reproduce the collected
data within varying levels of accuracy. By doing so, we aim to identify the
minimal network-level properties that are needed to closely match the
real-world data, with the aim of combining this contact pattern model with
epidemic models in future work.
| physics.soc-ph cond-mat.stat-mech | in this paper we provide a statistical analysis of highresolution contact pattern data within primary and secondary schools as collected by the sociopatterns collaboration students are graphically represented as nodes in a temporally evolving network in which links represent proximity or interaction between students this article focuses on link and nodelevel statistics such as the on and offdurations of links as well as the activity potential of nodes and links parametric models are fitted to the on and offdurations of links interevent times and node activity potentials and based on these we propose a number of theoretical models that are able to reproduce the collected data within varying levels of accuracy by doing so we aim to identify the minimal networklevel properties that are needed to closely match the realworld data with the aim of combining this contact pattern model with epidemic models in future work | [['in', 'this', 'paper', 'we', 'provide', 'a', 'statistical', 'analysis', 'of', 'highresolution', 'contact', 'pattern', 'data', 'within', 'primary', 'and', 'secondary', 'schools', 'as', 'collected', 'by', 'the', 'sociopatterns', 'collaboration', 'students', 'are', 'graphically', 'represented', 'as', 'nodes', 'in', 'a', 'temporally', 'evolving', 'network', 'in', 'which', 'links', 'represent', 'proximity', 'or', 'interaction', 'between', 'students', 'this', 'article', 'focuses', 'on', 'link', 'and', 'nodelevel', 'statistics', 'such', 'as', 'the', 'on', 'and', 'offdurations', 'of', 'links', 'as', 'well', 'as', 'the', 'activity', 'potential', 'of', 'nodes', 'and', 'links', 'parametric', 'models', 'are', 'fitted', 'to', 'the', 'on', 'and', 'offdurations', 'of', 'links', 'interevent', 'times', 'and', 'node', 'activity', 'potentials', 'and', 'based', 'on', 'these', 'we', 'propose', 'a', 'number', 'of', 'theoretical', 'models', 'that', 'are', 'able', 'to', 'reproduce', 'the', 'collected', 'data', 'within', 'varying', 'levels', 'of', 'accuracy', 'by', 'doing', 'so', 'we', 'aim', 'to', 'identify', 'the', 'minimal', 'networklevel', 'properties', 'that', 'are', 'needed', 'to', 'closely', 'match', 'the', 'realworld', 'data', 'with', 'the', 'aim', 'of', 'combining', 'this', 'contact', 'pattern', 'model', 'with', 'epidemic', 'models', 'in', 'future', 'work']] | [-0.1134583660673311, 0.06999661644490865, -0.05715336669079708, 0.0732299190192073, -0.06581227463780792, -0.13963790182870897, 0.09400262700644536, 0.40927793483178204, -0.22582992348311978, -0.39086514126861116, 0.07708774116932304, -0.31334128358459973, -0.1943834123437857, 0.1576498947203993, -0.06869115115149871, 0.043862935976236014, 0.07566801685484947, 0.06547111848396106, 0.013023537779031516, -0.2318809055137103, 0.3543675701830771, 0.10172797721270081, 0.2760463236941845, 0.037063643170221074, 0.049879667149706895, -0.008861007266580226, -0.08446726097783946, 0.03537731603686731, -0.12188660514643139, 0.14713198999008098, 0.28200357597236503, 0.14732044828743054, 0.22191072213691432, -0.4740028327682635, -0.21993858912321446, 0.08842413705754114, 0.14049204656776118, 0.05562725612955572, 0.002588071430531832, -0.29583183770764854, 0.08195366036477401, -0.17341286815390303, -0.07658461966206664, -0.06395855519295364, -0.026692698843178007, 0.10049062930503404, -0.23912759119371227, 0.06481722196225416, -0.0024123739897293018, 0.11485174074899275, -0.03162267267495602, -0.06524866245466389, -0.028392417361256438, 0.2074214897225969, 0.051734006082007365, 0.0035024506131095903, 0.09043946120744714, -0.1489249556195121, -0.14363777422561094, 0.36311137608791394, -0.03300002012792584, -0.17631789352549435, 0.2324739637401222, -0.09707732440031075, -0.1347360113746376, 0.05204433059137497, 0.26441596572489273, 0.05750014537447165, -0.19242557157579993, -0.02112093626096571, -0.015501610288344375, 0.14838091198394035, 0.031232926014393984, -0.00414900088982357, 0.20632515382021666, 0.20493418544732764, 0.022342882203784855, 0.09828567748215258, -0.09887929143501328, -0.09863421758734524, -0.28254830402849646, -0.0866775906911784, -0.17666767868441302, -0.0043200435356230485, -0.042929858353230745, -0.11892174282013536, 0.4346569369618709, 0.1658807701424702, 0.26161857012503004, 0.08561272296315332, 0.283724890989284, 0.04982901841542078, 0.06352094916620299, 0.06886830209539486, 0.18400142643717932, 0.09077171653906417, 0.10948853466946346, -0.15473506571334247, 0.09957018391379005, -0.014818209379755117] |
1,802.07262 | Stellar binaries incident on supermassive black hole binaries:
implications for double tidal disruption events, calcium-rich transients, and
hypervelocity stars | We analyze the outcome of the interaction between a stellar binary and a
supermassive black hole binary (SMBHB) by performing a large number of
gravitational scattering experiments. Most of the encounters result in either
the ejection of an intact binary or the ejection of two individual stars
following the tidal breakup of the binary. However, tidal disruption events
(TDEs) and mergers constitute a few percent of the outcomes, and double,
temporally distinct TDEs (i.e., separated by at least one orbit of the
supermassive black hole binary) occur at the percent level. We also demonstrate
that the properties of the ejected binaries are significantly altered through
the interaction with the SMBHB, and their large eccentricities increase the
merger rate and could lead to gravitational-wave inspirals far from the nucleus
of the host galaxy. We discuss our results in the context of observed tidal
disruption events, hypervelocity stars, and remote supernovae, such as
calcium-rich transients.
| astro-ph.GA astro-ph.HE | we analyze the outcome of the interaction between a stellar binary and a supermassive black hole binary smbhb by performing a large number of gravitational scattering experiments most of the encounters result in either the ejection of an intact binary or the ejection of two individual stars following the tidal breakup of the binary however tidal disruption events tdes and mergers constitute a few percent of the outcomes and double temporally distinct tdes ie separated by at least one orbit of the supermassive black hole binary occur at the percent level we also demonstrate that the properties of the ejected binaries are significantly altered through the interaction with the smbhb and their large eccentricities increase the merger rate and could lead to gravitationalwave inspirals far from the nucleus of the host galaxy we discuss our results in the context of observed tidal disruption events hypervelocity stars and remote supernovae such as calciumrich transients | [['we', 'analyze', 'the', 'outcome', 'of', 'the', 'interaction', 'between', 'a', 'stellar', 'binary', 'and', 'a', 'supermassive', 'black', 'hole', 'binary', 'smbhb', 'by', 'performing', 'a', 'large', 'number', 'of', 'gravitational', 'scattering', 'experiments', 'most', 'of', 'the', 'encounters', 'result', 'in', 'either', 'the', 'ejection', 'of', 'an', 'intact', 'binary', 'or', 'the', 'ejection', 'of', 'two', 'individual', 'stars', 'following', 'the', 'tidal', 'breakup', 'of', 'the', 'binary', 'however', 'tidal', 'disruption', 'events', 'tdes', 'and', 'mergers', 'constitute', 'a', 'few', 'percent', 'of', 'the', 'outcomes', 'and', 'double', 'temporally', 'distinct', 'tdes', 'ie', 'separated', 'by', 'at', 'least', 'one', 'orbit', 'of', 'the', 'supermassive', 'black', 'hole', 'binary', 'occur', 'at', 'the', 'percent', 'level', 'we', 'also', 'demonstrate', 'that', 'the', 'properties', 'of', 'the', 'ejected', 'binaries', 'are', 'significantly', 'altered', 'through', 'the', 'interaction', 'with', 'the', 'smbhb', 'and', 'their', 'large', 'eccentricities', 'increase', 'the', 'merger', 'rate', 'and', 'could', 'lead', 'to', 'gravitationalwave', 'inspirals', 'far', 'from', 'the', 'nucleus', 'of', 'the', 'host', 'galaxy', 'we', 'discuss', 'our', 'results', 'in', 'the', 'context', 'of', 'observed', 'tidal', 'disruption', 'events', 'hypervelocity', 'stars', 'and', 'remote', 'supernovae', 'such', 'as', 'calciumrich', 'transients']] | [-0.15559815832648086, 0.15103891125837954, -0.025419479126439375, 0.14974302866076136, -0.08621081555858741, -0.03472804555097242, 0.06377592880478178, 0.3244229087459983, -0.19564938673131727, -0.3358649709475002, 0.04210067782216261, -0.3464597577618715, -0.0869069615990727, 0.2464525956840078, -0.012979564157337805, -0.008927021622262115, 0.16538646271120563, -0.004765972616820553, -0.07817487647373449, -0.28911294499290435, 0.34417144597501925, 0.09443757570732166, 0.04676983585228133, -0.06840424291903474, 0.09639401317214946, 0.016429154841484977, -0.014139618686540357, -0.03414259345142865, -0.11548525979614009, 0.025516898228232963, 0.22752755990607992, 0.1800719736496997, 0.25593095421304113, -0.4140601352380674, -0.20606055971253298, 0.055484535607807584, 0.16778103087791332, 0.1136070694348294, -0.13315763302661746, -0.2930296642007306, 0.09322661956546986, -0.326491094547403, -0.1289395535839539, 0.07422033111485683, 0.06715904735028744, 0.08557028238725502, -0.20343955308564154, 0.16066699891234748, 0.1038304127857783, -0.03973145636857724, -0.12157636547455065, -0.02516191192214785, -0.0633597541098282, 0.10776943192525092, 0.14150276047092394, 0.03033681318952909, 0.22359178267918478, -0.12277745144301722, -0.1047217606938158, 0.4025348721717308, -0.02213260224636863, -0.01773607274334805, 0.27244239317837593, -0.256395077472857, -0.12875336751697913, 0.15462236689233216, 0.22025079722820592, 0.1605856379789294, -0.14640239735736565, -0.07843678394329484, 0.046195918560222864, 0.1859417761283397, 0.11673338004095736, 0.07033040920994169, 0.42935831427537635, 0.15738743837934985, -0.031212931161052455, 0.09495122764819587, -0.2239134893235233, -0.015244109814779626, -0.2205199260436595, -0.06713196453851422, -0.13795140359909852, 0.09539743042642287, -0.1601726729964938, -0.15352640540439488, 0.32235745275454, 0.07727530819296934, 0.24475936178921484, -0.007435098803279544, 0.24872380011148898, 0.056796661941060686, 0.08090424101367544, 0.0968954088318533, 0.3933601651182459, 0.12241231800236563, 0.014530546859734587, -0.26918567398569115, 0.11900894608336433, 0.019836465572463532] |
1,802.07263 | The Fate of Supernova-Heated Gas in Star-Forming Regions of the LMC:
Lessons for Galaxy Formation? | Galactic winds and fountains driven by supernova-heated gas play an integral
role in re-distributing gas in galaxies, depositing metals in the
circumgalactic medium (CGM), and quenching star formation. The interplay
between these outflows and ram pressure stripping due to the galaxy's motion
through an ambient medium may enhance these effects by converting fountain
flows into expelled gas. In this paper, we present controlled, 3D simulations
of ram pressure stripping combined with thermally driven, local outflows from
clustered supernovae in an isolated disk galaxy modeled on the Large Magellanic
Cloud (LMC), a dwarf satellite of the Milky Way on its first infall.
Observational evidence of local outflows emanating from supergiant shells in
the LMC and a trailing filament of HI gas originating from these regions - with
no obvious Leading Arm counterpart - may represent a perfect example of this
process. Our simulations present a proof-of-concept that ram pressure can
convert fountain flows into expelled gas. We find that fountains launched near
the peak star formation time of the LMC can comprise part of the LMC filament
in the Trailing Stream, but with lower column densities than observed. Larger,
more numerous outflows from the LMC may be possible and may contribute more
mass, but higher inertia gas will lengthen the timescale for this gas to be
swept away by ram pressure. Given the high resolution observations, increased
knowledge of star formation histories, and growing evidence of multiphase,
ionized outflows, the LMC is an ideal test-bed for future wind models.
| astro-ph.GA | galactic winds and fountains driven by supernovaheated gas play an integral role in redistributing gas in galaxies depositing metals in the circumgalactic medium cgm and quenching star formation the interplay between these outflows and ram pressure stripping due to the galaxys motion through an ambient medium may enhance these effects by converting fountain flows into expelled gas in this paper we present controlled 3d simulations of ram pressure stripping combined with thermally driven local outflows from clustered supernovae in an isolated disk galaxy modeled on the large magellanic cloud lmc a dwarf satellite of the milky way on its first infall observational evidence of local outflows emanating from supergiant shells in the lmc and a trailing filament of hi gas originating from these regions with no obvious leading arm counterpart may represent a perfect example of this process our simulations present a proofofconcept that ram pressure can convert fountain flows into expelled gas we find that fountains launched near the peak star formation time of the lmc can comprise part of the lmc filament in the trailing stream but with lower column densities than observed larger more numerous outflows from the lmc may be possible and may contribute more mass but higher inertia gas will lengthen the timescale for this gas to be swept away by ram pressure given the high resolution observations increased knowledge of star formation histories and growing evidence of multiphase ionized outflows the lmc is an ideal testbed for future wind models | [['galactic', 'winds', 'and', 'fountains', 'driven', 'by', 'supernovaheated', 'gas', 'play', 'an', 'integral', 'role', 'in', 'redistributing', 'gas', 'in', 'galaxies', 'depositing', 'metals', 'in', 'the', 'circumgalactic', 'medium', 'cgm', 'and', 'quenching', 'star', 'formation', 'the', 'interplay', 'between', 'these', 'outflows', 'and', 'ram', 'pressure', 'stripping', 'due', 'to', 'the', 'galaxys', 'motion', 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1,802.07264 | Stunted accretion growth of black holes by combined effect of the flow
angular momentum and radiation feedback | Accretion on to seed black holes (BHs) is believed to play a crucial role in
formation of supermassive BHs observed at high-redshift (z>6). Here, we
investigate the combined effect of gas angular momentum and radiation feedback
on the accretion flow, by performing 2D axially symmetric radiation
hydrodynamics simulations that solve the flow structure across the Bondi radius
and the outer part of the accretion disc simultaneously. The accreting gas with
finite angular momentum forms a rotationally-supported disc inside the Bondi
radius, where the accretion proceeds by the angular momentum transport due to
assumed alpha-type viscosity. We find that the interplay of radiation and
angular momentum significantly suppresses accretion even if the radiative
feedback is weakened in an equatorial shadowing region. The accretion rate is
O(alpha)\sim O(0.01-0.1) times the Bondi value, where alpha is the viscosity
parameter. By developing an analytical model, we show that such a great
reduction of the accretion rate persists unless the angular momentum is so
small that the corresponding centrifugal radius is \lesssim 0.04 times the
Bondi radius. We argue that BHs are hard to grow quickly via rapid mass
accretion considering the angular momentum barrier presented in this paper.
| astro-ph.GA astro-ph.CO | accretion on to seed black holes bhs is believed to play a crucial role in formation of supermassive bhs observed at highredshift z6 here we investigate the combined effect of gas angular momentum and radiation feedback on the accretion flow by performing 2d axially symmetric radiation hydrodynamics simulations that solve the flow structure across the bondi radius and the outer part of the accretion disc simultaneously the accreting gas with finite angular momentum forms a rotationallysupported disc inside the bondi radius where the accretion proceeds by the angular momentum transport due to assumed alphatype viscosity we find that the interplay of radiation and angular momentum significantly suppresses accretion even if the radiative feedback is weakened in an equatorial shadowing region the accretion rate is oalphasim o00101 times the bondi value where alpha is the viscosity parameter by developing an analytical model we show that such a great reduction of the accretion rate persists unless the angular momentum is so small that the corresponding centrifugal radius is lesssim 004 times the bondi radius we argue that bhs are hard to grow quickly via rapid mass accretion considering the angular momentum barrier presented in this paper | [['accretion', 'on', 'to', 'seed', 'black', 'holes', 'bhs', 'is', 'believed', 'to', 'play', 'a', 'crucial', 'role', 'in', 'formation', 'of', 'supermassive', 'bhs', 'observed', 'at', 'highredshift', 'z6', 'here', 'we', 'investigate', 'the', 'combined', 'effect', 'of', 'gas', 'angular', 'momentum', 'and', 'radiation', 'feedback', 'on', 'the', 'accretion', 'flow', 'by', 'performing', '2d', 'axially', 'symmetric', 'radiation', 'hydrodynamics', 'simulations', 'that', 'solve', 'the', 'flow', 'structure', 'across', 'the', 'bondi', 'radius', 'and', 'the', 'outer', 'part', 'of', 'the', 'accretion', 'disc', 'simultaneously', 'the', 'accreting', 'gas', 'with', 'finite', 'angular', 'momentum', 'forms', 'a', 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1,802.07265 | Hydrodynamic electron flow in a Weyl semimetal slab: Role of
Chern-Simons terms | The hydrodynamic flow of the chiral electron fluid in a Weyl semimetal slab
of finite thickness is studied by using the consistent hydrodynamic theory. The
latter includes viscous, anomalous, and vortical effects, as well as accounts
for dynamical electromagnetism. The energy and momentum separations between the
Weyl nodes are taken into account via the topological Chern-Simons
contributions in the electric current and charge densities in Maxwell's
equations. When an external electric field is applied parallel to the slab, it
is found that the electron fluid velocity has a nonuniform profile determined
by the viscosity and the no-slip boundary conditions. Most remarkably, the
fluid velocity field develops a nonzero component across the slab that
gradually dissipates when approaching the surfaces. This abnormal component of
the flow arises due to the anomalous Hall voltage induced by the topological
Chern-Simons current. Another signature feature of the hydrodynamics in Weyl
semimetals is a strong modification of the anomalous Hall current along the
slab in the direction perpendicular to the applied electric field.
Additionally, it is found that the topological current induces an electric
potential difference between the surfaces of the slab that is strongly affected
by the hydrodynamic flow.
| cond-mat.str-el cond-mat.mes-hall hep-th | the hydrodynamic flow of the chiral electron fluid in a weyl semimetal slab of finite thickness is studied by using the consistent hydrodynamic theory the latter includes viscous anomalous and vortical effects as well as accounts for dynamical electromagnetism the energy and momentum separations between the weyl nodes are taken into account via the topological chernsimons contributions in the electric current and charge densities in maxwells equations when an external electric field is applied parallel to the slab it is found that the electron fluid velocity has a nonuniform profile determined by the viscosity and the noslip boundary conditions most remarkably the fluid velocity field develops a nonzero component across the slab that gradually dissipates when approaching the surfaces this abnormal component of the flow arises due to the anomalous hall voltage induced by the topological chernsimons current another signature feature of the hydrodynamics in weyl semimetals is a strong modification of the anomalous hall current along the slab in the direction perpendicular to the applied electric field additionally it is found that the topological current induces an electric potential difference between the surfaces of the slab that is strongly affected by the hydrodynamic flow | [['the', 'hydrodynamic', 'flow', 'of', 'the', 'chiral', 'electron', 'fluid', 'in', 'a', 'weyl', 'semimetal', 'slab', 'of', 'finite', 'thickness', 'is', 'studied', 'by', 'using', 'the', 'consistent', 'hydrodynamic', 'theory', 'the', 'latter', 'includes', 'viscous', 'anomalous', 'and', 'vortical', 'effects', 'as', 'well', 'as', 'accounts', 'for', 'dynamical', 'electromagnetism', 'the', 'energy', 'and', 'momentum', 'separations', 'between', 'the', 'weyl', 'nodes', 'are', 'taken', 'into', 'account', 'via', 'the', 'topological', 'chernsimons', 'contributions', 'in', 'the', 'electric', 'current', 'and', 'charge', 'densities', 'in', 'maxwells', 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1,802.07266 | Effective stability against superradiance of Kerr black holes with
synchronised hair | Kerr black holes with synchronised hair [arXiv:1403.2757, arXiv:1603.02687]
are a counter example to the no hair conjecture, in General Relativity
minimally coupled to simple matter fields (with mass $\mu$) obeying all energy
conditions. Since these solutions have, like Kerr, an ergoregion it has been a
lingering possibility that they are afflicted by the superradiant instability,
the same process that leads to their dynamical formation from Kerr. A recent
breakthrough [arXiv:1711.08464] confirmed this instability and computed the
corresponding timescales for a sample of solutions. We discuss how these
results and other observations support two conclusions: $1)$ starting from the
Kerr limit, the increase of hair for fixed coupling $\mu M$ (where $M$ is the
BH mass) increases the timescale of the instability; $2)$ there are hairy
solutions for which this timescale, for astrophysical black hole masses, is
larger than the age of the Universe. The latter conclusion introduces the
limited, but physically relevant concept of effective stability. The former
conclusion, allows us to identify an astrophysically viable domain of such
effectively stable hairy black holes, occurring, conservatively, for $M\mu
\lesssim 0.25$. These are hairy BHs that form dynamically, from the
superradiant instability of Kerr, within an astrophysical timescale, but whose
own superradiant instability occurs only in a cosmological timescale.
| gr-qc astro-ph.HE hep-th | kerr black holes with synchronised hair arxiv14032757 arxiv160302687 are a counter example to the no hair conjecture in general relativity minimally coupled to simple matter fields with mass mu obeying all energy conditions since these solutions have like kerr an ergoregion it has been a lingering possibility that they are afflicted by the superradiant instability the same process that leads to their dynamical formation from kerr a recent breakthrough arxiv171108464 confirmed this instability and computed the corresponding timescales for a sample of solutions we discuss how these results and other observations support two conclusions 1 starting from the kerr limit the increase of hair for fixed coupling mu m where m is the bh mass increases the timescale of the instability 2 there are hairy solutions for which this timescale for astrophysical black hole masses is larger than the age of the universe the latter conclusion introduces the limited but physically relevant concept of effective stability the former conclusion allows us to identify an astrophysically viable domain of such effectively stable hairy black holes occurring conservatively for mmu lesssim 025 these are hairy bhs that form dynamically from the superradiant instability of kerr within an astrophysical timescale but whose own superradiant instability occurs only in a cosmological timescale | [['kerr', 'black', 'holes', 'with', 'synchronised', 'hair', 'arxiv14032757', 'arxiv160302687', 'are', 'a', 'counter', 'example', 'to', 'the', 'no', 'hair', 'conjecture', 'in', 'general', 'relativity', 'minimally', 'coupled', 'to', 'simple', 'matter', 'fields', 'with', 'mass', 'mu', 'obeying', 'all', 'energy', 'conditions', 'since', 'these', 'solutions', 'have', 'like', 'kerr', 'an', 'ergoregion', 'it', 'has', 'been', 'a', 'lingering', 'possibility', 'that', 'they', 'are', 'afflicted', 'by', 'the', 'superradiant', 'instability', 'the', 'same', 'process', 'that', 'leads', 'to', 'their', 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1,802.07267 | Analysis of constraints and their algebra in bimetric theory | We perform a canonical analysis of the bimetric theory in the metric
formulation, computing the constraints and their algebra explicitly. In
particular, we compute a secondary constraint, that has been argued to exist
earlier, and show that it has the correct form to eliminate the ghost. We also
identify a set of four first class constraints that generate the algebra of
general covariance. The covariance algebra naturally determines a spacetime
metric for the theory. However, in bimetric theory, this metric is not unique
but depends on how the first class constraints are identified.
| hep-th gr-qc | we perform a canonical analysis of the bimetric theory in the metric formulation computing the constraints and their algebra explicitly in particular we compute a secondary constraint that has been argued to exist earlier and show that it has the correct form to eliminate the ghost we also identify a set of four first class constraints that generate the algebra of general covariance the covariance algebra naturally determines a spacetime metric for the theory however in bimetric theory this metric is not unique but depends on how the first class constraints are identified | [['we', 'perform', 'a', 'canonical', 'analysis', 'of', 'the', 'bimetric', 'theory', 'in', 'the', 'metric', 'formulation', 'computing', 'the', 'constraints', 'and', 'their', 'algebra', 'explicitly', 'in', 'particular', 'we', 'compute', 'a', 'secondary', 'constraint', 'that', 'has', 'been', 'argued', 'to', 'exist', 'earlier', 'and', 'show', 'that', 'it', 'has', 'the', 'correct', 'form', 'to', 'eliminate', 'the', 'ghost', 'we', 'also', 'identify', 'a', 'set', 'of', 'four', 'first', 'class', 'constraints', 'that', 'generate', 'the', 'algebra', 'of', 'general', 'covariance', 'the', 'covariance', 'algebra', 'naturally', 'determines', 'a', 'spacetime', 'metric', 'for', 'the', 'theory', 'however', 'in', 'bimetric', 'theory', 'this', 'metric', 'is', 'not', 'unique', 'but', 'depends', 'on', 'how', 'the', 'first', 'class', 'constraints', 'are', 'identified']] | [-0.12717619707797884, 0.05867823783398395, -0.13760888512416553, 0.10263924492943671, -0.14914880808122377, -0.1124212581624267, -0.01628144229987576, 0.3211801375477745, -0.26440163100919417, -0.29470909651248683, 0.0972171464130052, -0.23458969865434914, -0.23644111363557718, 0.13220680740371507, -0.08264439781346629, -0.0037343305465514943, 0.030413812689823648, 0.09711587670389363, -0.1265131818025463, -0.24028754801619598, 0.37957180849707095, 0.04715411292929803, 0.2809740612183207, 0.031276471036616516, 0.13445056599354552, -0.023424035337533282, -0.054884753941047575, 0.06585065988943942, -0.12951160279991072, 0.09403613675260536, 0.2247142728608382, 0.2002566077481074, 0.25122044147342765, -0.38903265796922226, -0.21854930138716133, 0.1432053715851839, 0.11874194210395217, 0.1233080904880759, -0.01991680491920961, -0.2157312705712293, 0.11407275311883554, -0.1959106205632129, -0.10655106483427908, -0.10689327825281408, 0.021927624560331784, -0.07714290301232869, -0.2537361185807454, 0.033102413155927116, 0.05194920521750245, -0.017205857842039037, -0.08875043514204682, -0.05130149968724538, -0.0334304463674104, 0.10810305210711654, 0.052431817875013394, 0.03541962498478511, 0.10128694778228159, -0.10122519997837302, -0.10408187662163669, 0.3917715954444101, -0.04011253319600577, -0.2700556000314092, 0.1307413072315275, -0.15306656742818975, -0.2534555646550832, 0.06665935586657255, 0.14588028726278132, 0.14168226579704912, -0.16331397236314832, 0.190545892962555, -0.0936701141012412, 0.11851565625959186, 0.05186064784184739, 0.06420554575993509, 0.1883697267421471, 0.08879792674755056, 0.06645330391143278, 0.11055710663398106, -0.00676731028974617, -0.10625471024503631, -0.3580362086775162, -0.13891827171888724, -0.1606709604922642, 0.042118760560775646, -0.08592751888046292, -0.19645570126432244, 0.3771292675581951, 0.16557120779148674, 0.1522473783021973, 0.0699531111155226, 0.23668547265071382, 0.14026617830489657, 0.08129169826235583, 0.0665782556208151, 0.2953413752137974, 0.1510276332727924, 0.03597451541672952, -0.20375947715271445, -0.0022684440207016723, 0.07994741381156029] |
1,802.07268 | Scrambling in the Quantum Lifshitz Model | We study signatures of chaos in the quantum Lifshitz model through
out-of-time ordered correlators (OTOC) of current operators. This model is a
free scalar field theory with dynamical critical exponent $z=2$. It describes
the quantum phase transition in 2D systems, such as quantum dimer models,
between a phase with an uniform ground state to another one with a
spontaneously translation invariance. At the lowest temperatures the chaotic
dynamics are dominated by a marginally irrelevant operator which induces a
temperature dependent stiffness term. The numerical computations of OTOC
exhibit a non-zero Lyapunov exponent (LE) in a wide range of temperatures and
interaction strengths. The LE (in units of temperature) is a weakly
temperature-dependent function; it vanishes at weak interaction and saturates
for strong interaction. The Butterfly velocity increases monotonically with
interaction strength in the studied region while remaining smaller than the
interaction-induced velocity/stiffness.
| cond-mat.str-el cond-mat.stat-mech | we study signatures of chaos in the quantum lifshitz model through outoftime ordered correlators otoc of current operators this model is a free scalar field theory with dynamical critical exponent z2 it describes the quantum phase transition in 2d systems such as quantum dimer models between a phase with an uniform ground state to another one with a spontaneously translation invariance at the lowest temperatures the chaotic dynamics are dominated by a marginally irrelevant operator which induces a temperature dependent stiffness term the numerical computations of otoc exhibit a nonzero lyapunov exponent le in a wide range of temperatures and interaction strengths the le in units of temperature is a weakly temperaturedependent function it vanishes at weak interaction and saturates for strong interaction the butterfly velocity increases monotonically with interaction strength in the studied region while remaining smaller than the interactioninduced velocitystiffness | [['we', 'study', 'signatures', 'of', 'chaos', 'in', 'the', 'quantum', 'lifshitz', 'model', 'through', 'outoftime', 'ordered', 'correlators', 'otoc', 'of', 'current', 'operators', 'this', 'model', 'is', 'a', 'free', 'scalar', 'field', 'theory', 'with', 'dynamical', 'critical', 'exponent', 'z2', 'it', 'describes', 'the', 'quantum', 'phase', 'transition', 'in', '2d', 'systems', 'such', 'as', 'quantum', 'dimer', 'models', 'between', 'a', 'phase', 'with', 'an', 'uniform', 'ground', 'state', 'to', 'another', 'one', 'with', 'a', 'spontaneously', 'translation', 'invariance', 'at', 'the', 'lowest', 'temperatures', 'the', 'chaotic', 'dynamics', 'are', 'dominated', 'by', 'a', 'marginally', 'irrelevant', 'operator', 'which', 'induces', 'a', 'temperature', 'dependent', 'stiffness', 'term', 'the', 'numerical', 'computations', 'of', 'otoc', 'exhibit', 'a', 'nonzero', 'lyapunov', 'exponent', 'le', 'in', 'a', 'wide', 'range', 'of', 'temperatures', 'and', 'interaction', 'strengths', 'the', 'le', 'in', 'units', 'of', 'temperature', 'is', 'a', 'weakly', 'temperaturedependent', 'function', 'it', 'vanishes', 'at', 'weak', 'interaction', 'and', 'saturates', 'for', 'strong', 'interaction', 'the', 'butterfly', 'velocity', 'increases', 'monotonically', 'with', 'interaction', 'strength', 'in', 'the', 'studied', 'region', 'while', 'remaining', 'smaller', 'than', 'the', 'interactioninduced', 'velocitystiffness']] | [-0.20034954491144058, 0.28220863245745065, -0.06372311029662477, 0.04884712588362369, 0.02018227022725772, -0.19019476066472285, 0.018411244144365985, 0.31545663404390745, -0.2713797617280948, -0.23225853129220692, 0.02855927837890381, -0.31449399161291247, -0.13763257905391726, 0.1621479264853509, 0.08279529097139116, 0.03555380578436856, -0.03262020143719905, 0.05699978846353181, -0.12168725422444812, -0.16638047680595613, 0.3098075647032589, 0.053458925796481156, 0.2771756755541482, 0.06920025393479101, 0.06612620859387074, -0.0067554487391038144, 0.07175670571110034, 0.02696074763682823, -0.1683163602988348, -0.006573246725907563, 0.19259691843053459, -0.019823541220753117, 0.24418030865820692, -0.34792188796749773, -0.22208793465203294, 0.0959631785344174, 0.14511241905510108, 0.12902205484731005, -0.02913818589381953, -0.2915014008931974, 0.04195872824374877, -0.18111829150547373, -0.16496037919047876, -0.06781361413234514, 0.048143838607402296, -0.03047082461755234, -0.2646461995747865, 0.16999932030110176, 0.047589015695126066, 0.11215485976876836, -0.057065576486452975, -0.04937425777910555, -0.05972832301301314, 0.09950620999042908, 0.03749233185381138, 0.08119213736057942, 0.14987769501666862, -0.18840385999048379, -0.06685034371995044, 0.31706714622200804, -0.11059450116538994, -0.1460367079018384, 0.2117565521534453, -0.17788647568672367, -0.10487152398369896, 0.1585000731572773, 0.10595097547357386, 0.10201280187247387, -0.08122053011221454, 0.13492074575694607, 0.026113769316926917, 0.21562649234501868, 8.815892886185477e-07, 0.057942595838152984, 0.23796488965881316, 0.1330494674200073, 0.07414496777139948, 0.16118627160470536, -0.04388439846192057, -0.18619526962498664, -0.292309216122929, -0.11959889636817553, -0.19337518790617902, 0.05025718804673417, -0.13242226104224794, -0.1996786941325041, 0.38752622989911245, 0.1428760199911615, 0.22549826356562527, 0.047781015745469814, 0.24239866892932682, 0.1807139038912463, 0.08478725127254923, 0.0644368305513371, 0.2490392415165069, 0.16664513751058607, 0.12611131007611381, -0.2613049530761039, 0.029094121709518823, 0.09128124423404323] |
1,802.07269 | Late-time magnetogenesis driven by ALP dark matter and dark photon | We propose a mechanism generating primordial magnetic fields after the
$e^+e^-$ annihilations. Our mechanism involves an ultra-light axion-like
particle (ALP) which constitutes the dark matter, and a dark $U(1)_X$ gauge
boson introduced to bypass the obstacle placed by the conductivity of cosmic
plasma. In our scheme, a coherently oscillating ALP amplifies the dark photon
field, and part of the amplified dark photon field is concurrently converted to
the ordinary magnetic field through the ALP-induced magnetic mixing. For the
relevant ALP mass range $10^{-21} {\rm eV}\lesssim m_\phi\lesssim 10^{-17}{\rm
eV}$, our mechanism can generate $B\sim 10^{-24} \,{\rm G} \,(m_\phi/10^{-17}
{\rm eV})^{5/4}$ with a coherent length $\lambda \sim (m_\phi/10^{-17} {\rm
eV})^{-1/2}$ kpc, which is large enough to provide a seed of the galactic
magnetic fields. The mechanism also predicts a dark $U(1)_X$ electromagnetic
field $E_X \sim B_X\sim 80\,{\rm nG}\, (m_\phi/10^{-17}{\rm eV})^{-1/4}$, which
can result in interesting astrophysical/cosmological phenomena by inducing the
mixings between the ALP, ordinary photon, and dark photon states.
| hep-ph astro-ph.CO | we propose a mechanism generating primordial magnetic fields after the ee annihilations our mechanism involves an ultralight axionlike particle alp which constitutes the dark matter and a dark u1_x gauge boson introduced to bypass the obstacle placed by the conductivity of cosmic plasma in our scheme a coherently oscillating alp amplifies the dark photon field and part of the amplified dark photon field is concurrently converted to the ordinary magnetic field through the alpinduced magnetic mixing for the relevant alp mass range 1021 rm evlesssim m_philesssim 1017rm ev our mechanism can generate bsim 1024 rm g m_phi1017 rm ev54 with a coherent length lambda sim m_phi1017 rm ev12 kpc which is large enough to provide a seed of the galactic magnetic fields the mechanism also predicts a dark u1_x electromagnetic field e_x sim b_xsim 80rm ng m_phi1017rm ev14 which can result in interesting astrophysicalcosmological phenomena by inducing the mixings between the alp ordinary photon and dark photon states | [['we', 'propose', 'a', 'mechanism', 'generating', 'primordial', 'magnetic', 'fields', 'after', 'the', 'ee', 'annihilations', 'our', 'mechanism', 'involves', 'an', 'ultralight', 'axionlike', 'particle', 'alp', 'which', 'constitutes', 'the', 'dark', 'matter', 'and', 'a', 'dark', 'u1_x', 'gauge', 'boson', 'introduced', 'to', 'bypass', 'the', 'obstacle', 'placed', 'by', 'the', 'conductivity', 'of', 'cosmic', 'plasma', 'in', 'our', 'scheme', 'a', 'coherently', 'oscillating', 'alp', 'amplifies', 'the', 'dark', 'photon', 'field', 'and', 'part', 'of', 'the', 'amplified', 'dark', 'photon', 'field', 'is', 'concurrently', 'converted', 'to', 'the', 'ordinary', 'magnetic', 'field', 'through', 'the', 'alpinduced', 'magnetic', 'mixing', 'for', 'the', 'relevant', 'alp', 'mass', 'range', '1021', 'rm', 'evlesssim', 'm_philesssim', '1017rm', 'ev', 'our', 'mechanism', 'can', 'generate', 'bsim', '1024', 'rm', 'g', 'm_phi1017', 'rm', 'ev54', 'with', 'a', 'coherent', 'length', 'lambda', 'sim', 'm_phi1017', 'rm', 'ev12', 'kpc', 'which', 'is', 'large', 'enough', 'to', 'provide', 'a', 'seed', 'of', 'the', 'galactic', 'magnetic', 'fields', 'the', 'mechanism', 'also', 'predicts', 'a', 'dark', 'u1_x', 'electromagnetic', 'field', 'e_x', 'sim', 'b_xsim', '80rm', 'ng', 'm_phi1017rm', 'ev14', 'which', 'can', 'result', 'in', 'interesting', 'astrophysicalcosmological', 'phenomena', 'by', 'inducing', 'the', 'mixings', 'between', 'the', 'alp', 'ordinary', 'photon', 'and', 'dark', 'photon', 'states']] | [-0.1832887438875284, 0.3293948813029511, -0.032245863375519185, 0.15942964552815336, -0.11102311779430371, -0.09694866816874051, -0.00339254629890749, 0.3183230264008273, -0.22804398944490398, -0.3983399792395483, -0.05828525814141412, -0.22547815485382514, 0.0209092552660323, 0.1939355880180096, 0.0907547349905879, -0.03592145507415103, -0.06472453161525164, 0.005156253617363273, 0.0577254608113146, -0.19968674982402979, 0.2412973312492982, 0.06275217249890827, 0.20542482408503723, 0.05975938862226657, 0.14331139932812148, -0.03042718863719149, 0.0531792619962566, -0.12073864515204698, -0.1362468605040571, 0.051670402229072786, 0.17531166489957678, 0.053467960891757926, 0.18626909735088318, -0.39058345432596786, -0.2006314674343001, 0.16435409557160657, 0.1735811131755399, 0.07069861813408279, -0.12362676824979632, -0.34154072623477866, 0.08525546287827884, -0.19828813279430005, -0.08479859191455588, 0.007639332842513524, -0.017736719193442767, -0.0491033375717311, -0.3375180715221653, 0.1043421774915657, -0.014152031294717793, -0.07271640758887427, -0.024640911490045832, -0.08461997701496576, -0.02576528981772085, -0.08291618613563231, 0.12667864816886257, 0.09694546943419421, 0.2640750790169055, -0.2065349488009526, -0.07287756051399455, 0.4156836333240549, -0.15087217616460083, -0.08270478671700354, 0.0903905765986107, -0.11903387311204577, -0.10025082966960375, 0.19943406968069147, 0.13692044736879155, 0.10974978309877167, -0.0979792580782553, 0.16801254211618802, -0.06254677831685627, 0.22820985794764334, 0.05714210580466993, 0.06167511587086695, 0.3402126202273448, 0.13494612615931753, 0.06203766872748634, 0.05696012704503654, -0.13374616575445855, 0.006146623160912106, -0.3438569137869736, -0.12737601017271052, -0.08924316524817849, 0.11553262869845952, -0.09957882523843525, -0.10307591536162508, 0.3565754924141384, 0.14557958169476382, 0.201815050459214, -0.038886145791131387, 0.28812825358904504, 0.10863794206521345, 0.05913006903955232, 0.04163052659907335, 0.3056450227540702, 0.2212929044247278, 0.09264619912665387, -0.2299136513426271, -0.08836461510509253, 0.024993284997092375] |
1,802.0727 | Photoemission signature of excitons | Excitons - the particle-hole bound states - composed of localized
electron-hole states in semiconducting systems are crucial to explaining the
optical spectrum. Spectroscopic measurements can contain signatures of these
two particle bound states and can be particularly useful in determining the
characteristics of these excitons. We formulate an expression for evaluating
the angle-resolved photoemission spectrum arising from the ionization of
excitons given their steady-state distribution in a semiconductor. We show that
the spectrum contains information about the direct/indirect band gap nature of
the semiconductor and is located below the conduction band minimum displaced by
the binding energy. The dispersive features of the spectrum contains remnants
of the valence band while additional interesting features arise from different
exciton distributions. Our results indicate that for most exciton probability
distributions, the energy integrated photoemission spectrum provides an
estimate of the exciton Bohr radius.
| cond-mat.mes-hall cond-mat.mtrl-sci | excitons the particlehole bound states composed of localized electronhole states in semiconducting systems are crucial to explaining the optical spectrum spectroscopic measurements can contain signatures of these two particle bound states and can be particularly useful in determining the characteristics of these excitons we formulate an expression for evaluating the angleresolved photoemission spectrum arising from the ionization of excitons given their steadystate distribution in a semiconductor we show that the spectrum contains information about the directindirect band gap nature of the semiconductor and is located below the conduction band minimum displaced by the binding energy the dispersive features of the spectrum contains remnants of the valence band while additional interesting features arise from different exciton distributions our results indicate that for most exciton probability distributions the energy integrated photoemission spectrum provides an estimate of the exciton bohr radius | [['excitons', 'the', 'particlehole', 'bound', 'states', 'composed', 'of', 'localized', 'electronhole', 'states', 'in', 'semiconducting', 'systems', 'are', 'crucial', 'to', 'explaining', 'the', 'optical', 'spectrum', 'spectroscopic', 'measurements', 'can', 'contain', 'signatures', 'of', 'these', 'two', 'particle', 'bound', 'states', 'and', 'can', 'be', 'particularly', 'useful', 'in', 'determining', 'the', 'characteristics', 'of', 'these', 'excitons', 'we', 'formulate', 'an', 'expression', 'for', 'evaluating', 'the', 'angleresolved', 'photoemission', 'spectrum', 'arising', 'from', 'the', 'ionization', 'of', 'excitons', 'given', 'their', 'steadystate', 'distribution', 'in', 'a', 'semiconductor', 'we', 'show', 'that', 'the', 'spectrum', 'contains', 'information', 'about', 'the', 'directindirect', 'band', 'gap', 'nature', 'of', 'the', 'semiconductor', 'and', 'is', 'located', 'below', 'the', 'conduction', 'band', 'minimum', 'displaced', 'by', 'the', 'binding', 'energy', 'the', 'dispersive', 'features', 'of', 'the', 'spectrum', 'contains', 'remnants', 'of', 'the', 'valence', 'band', 'while', 'additional', 'interesting', 'features', 'arise', 'from', 'different', 'exciton', 'distributions', 'our', 'results', 'indicate', 'that', 'for', 'most', 'exciton', 'probability', 'distributions', 'the', 'energy', 'integrated', 'photoemission', 'spectrum', 'provides', 'an', 'estimate', 'of', 'the', 'exciton', 'bohr', 'radius']] | [-0.13306930132102276, 0.16258329350313178, -0.07923105339295285, 0.1136764442266397, -1.6640713168443114e-05, -0.14087545853850525, 0.05445403499069853, 0.39388193781791336, -0.2554487211577446, -0.3345001697256837, -0.028585319365948384, -0.3676730903655129, -0.07860475034154345, 0.18926204549084566, 0.04628269481000261, 0.0086194240138866, 0.06285999034696653, -0.0589517104048012, -0.06073061619257635, -0.11920653446746207, 0.33032150106315594, 0.06791098549476136, 0.26828175828373735, 0.15469778153161262, 0.0011738126842723484, 0.01580549418197378, 0.059274205819879106, -0.06981052454574492, -0.1383531531350657, 0.15521015587601933, 0.2853429636216142, 0.006739898436311362, 0.20650205298427507, -0.40349569452413614, -0.21305007113656704, 0.05586838410100967, 0.18343532416864933, 0.13811354631932615, -0.07040290533146565, -0.3043076221567943, 0.028804616195291444, -0.12288737157359719, -0.111076906144592, -0.04552784623692919, -0.02156412768839062, -0.0007540988233918999, -0.20298331313930196, 0.13808322168609966, 0.017259671200535842, -0.0006078415313242948, -0.1505691856837602, -0.15356540185018894, -0.10618567195606242, 0.11788620658563045, 0.0201658226045159, -0.059025727735454406, 0.16988671423219467, -0.15420629137551642, -0.11691903732244627, 0.3685885494898843, -0.07220310155147065, -0.07758071779043994, 0.14599470072425902, -0.17371911710411633, -0.06132720528926323, 0.20584504707864876, 0.09957971868604637, 0.1044385395826016, -0.11299224538463708, 0.06696819672546606, -0.056640166488131916, 0.21269892240483043, 0.0362904295105946, 0.2124963798189023, 0.2882665687011204, 0.13573050542829046, 0.05327179290664693, 0.1189726447573512, -0.1562259375089037, -0.04611177892302689, -0.26529535799678683, -0.14624898495621627, -0.27126402109591424, 0.07650946104305162, -0.02890194111577053, -0.17181707189782805, 0.4745165515637052, 0.08916034385818394, 0.21244144361749615, -0.029901124211365655, 0.2179772638027435, 0.16936696255647077, 0.0399217099926529, 0.06379779670522481, 0.2631681888107804, 0.14745869524810679, 0.06044384296072404, -0.27733727452426177, 0.03415395622479095, -0.02247634165468153] |
1,802.07271 | Self-Dual Skyrmions on the Spheres $S^{2N+1}$ | We construct self-dual sectors for scalar field theories on a
$(2N+2)$-dimensional Minkowski space-time with target space being the
$2N+1$-dimensional sphere $S^{2N+1}$. The construction of such self-dual
sectors is made possible by the introduction of an extra functional on the
action that renders the static energy and the self-duality equations
conformally invariant on the $(2N+1)$-dimensional spatial submanifold. The
conformal and target space symmetries are used to build an ansatz that leads to
an infinite number of exact self-dual solutions with arbitrary values of the
topological charge. The five dimensional case is discussed in detail where it
is shown that two types of theories admit self dual sectors. Our work
generalizes the known results in the three-dimensional case that leads to an
infinite set of self-dual Skyrmion solutions.
| hep-th math-ph math.MP nlin.SI nucl-th | we construct selfdual sectors for scalar field theories on a 2n2dimensional minkowski spacetime with target space being the 2n1dimensional sphere s2n1 the construction of such selfdual sectors is made possible by the introduction of an extra functional on the action that renders the static energy and the selfduality equations conformally invariant on the 2n1dimensional spatial submanifold the conformal and target space symmetries are used to build an ansatz that leads to an infinite number of exact selfdual solutions with arbitrary values of the topological charge the five dimensional case is discussed in detail where it is shown that two types of theories admit self dual sectors our work generalizes the known results in the threedimensional case that leads to an infinite set of selfdual skyrmion solutions | [['we', 'construct', 'selfdual', 'sectors', 'for', 'scalar', 'field', 'theories', 'on', 'a', '2n2dimensional', 'minkowski', 'spacetime', 'with', 'target', 'space', 'being', 'the', '2n1dimensional', 'sphere', 's2n1', 'the', 'construction', 'of', 'such', 'selfdual', 'sectors', 'is', 'made', 'possible', 'by', 'the', 'introduction', 'of', 'an', 'extra', 'functional', 'on', 'the', 'action', 'that', 'renders', 'the', 'static', 'energy', 'and', 'the', 'selfduality', 'equations', 'conformally', 'invariant', 'on', 'the', '2n1dimensional', 'spatial', 'submanifold', 'the', 'conformal', 'and', 'target', 'space', 'symmetries', 'are', 'used', 'to', 'build', 'an', 'ansatz', 'that', 'leads', 'to', 'an', 'infinite', 'number', 'of', 'exact', 'selfdual', 'solutions', 'with', 'arbitrary', 'values', 'of', 'the', 'topological', 'charge', 'the', 'five', 'dimensional', 'case', 'is', 'discussed', 'in', 'detail', 'where', 'it', 'is', 'shown', 'that', 'two', 'types', 'of', 'theories', 'admit', 'self', 'dual', 'sectors', 'our', 'work', 'generalizes', 'the', 'known', 'results', 'in', 'the', 'threedimensional', 'case', 'that', 'leads', 'to', 'an', 'infinite', 'set', 'of', 'selfdual', 'skyrmion', 'solutions']] | [-0.17750815681961646, 0.1471807831784688, -0.04258633394991713, 0.06300531119193202, -0.10132963759898549, -0.1276516130541466, -0.07272140707428908, 0.3127629241152179, -0.1862608585580592, -0.24128961919378195, 0.085396502978198, -0.2803652453502374, -0.16626392685556932, 0.1370838931613853, -0.05280088663234243, 0.021717989156304466, -0.012921411649412698, 0.11423013242523349, -0.11359804583064813, -0.30267127969908336, 0.3927298410322576, 0.0067901920031992686, 0.2922580912413578, 0.02099655731026793, 0.1498142494487443, 0.01835121428557036, 0.004030190784731762, 0.036260710662833255, -0.1541289496616671, 0.10945408767835783, 0.22901828894539486, 0.06528139060699484, 0.11772997587520097, -0.4252724253262083, -0.21818090900423057, 0.11280063617076459, 0.13748471303621218, 0.10485953814719641, -0.016256118168322637, -0.3081523364461545, 0.06537560074930153, -0.14861113179312457, -0.19561848425794215, -0.11785772850456101, 0.0245219223092251, -0.06783993324516194, -0.24634160986909318, -0.009289509864405745, 0.0642973840946243, 0.014744550071006257, -0.1272143866224233, -0.07102207824059334, -0.07257592693961684, 0.08679023026562636, 0.10979340562508219, 0.0811568556043009, 0.06447624498867385, -0.11414994512360574, -0.14269436415125955, 0.3562645469644358, -0.0554540853370868, -0.34017498859219136, 0.17525963119733784, -0.0928459300563508, -0.1288806312802499, 0.13249477147427757, 0.08968621895219835, 0.15911546454114456, -0.09842889861662, 0.23790251625431996, -0.086944011173078, 0.14300555208215623, 0.09352905553070799, 0.03873487357198009, 0.22783622753969024, 0.08720087392314796, 0.10230411901064808, 0.17314568828857904, -0.016024111960423252, -0.16726091269095103, -0.3766435535092439, -0.1744061251522489, -0.13490505601253566, 0.10645458468472556, -0.1393248803342142, -0.2181880933549976, 0.3685627330227622, 0.08111589334963817, 0.13484882029320394, 0.05531616169323642, 0.19637692628043985, 0.08186513407625691, 0.07526905873988105, 0.06946269355876933, 0.19835137141432377, 0.15511950662928736, 0.02737080022629853, -0.17687807215510734, -0.11102151181844491, 0.16559945542683144] |
1,802.07272 | From actinides to zinc: Using the full abundance pattern of the
brightest star in Reticulum II to distinguish between different r-process
sites | The ultra-faint dwarf galaxy Reticulum II was enriched by a rare and prolific
r-process event, such as a neutron star merger. To investigate the nature of
this event, we present high-resolution Magellan/MIKE spectroscopy of the
brightest star in this galaxy. The high signal-to-noise allows us to determine
the abundances of 41 elements, including the radioactive actinide element Th
and first ever detections of third r-process peak elements (Os and Ir) in a
star outside the Milky Way. The observed neutron-capture element abundances
closely match the solar r-process component, except for the first r-process
peak which is significantly lower than solar but matches other r-process
enhanced stars. The ratio of first peak to heavier r-process elements implies
the r-process site produces roughly equal masses of high and low electron
fraction ejecta, within a factor of 2. We compare the detailed abundance
pattern to predictions from nucleosynthesis calculations of neutron star
mergers and magneto-rotationally driven jet supernovae, finding that nuclear
physics uncertainties dominate over astrophysical uncertainties. We measure
$\log\mbox{Th/Eu} = -0.84 \pm 0.06\,\text{(stat)} \pm 0.22\,\text{(sys)}$,
somewhat lower than all previous Th/Eu observations. The youngest age we derive
from this ratio is $21.7 \pm 2.8\,\text{(stat)} \pm 10.3\,\text{(sys)}$ Gyr,
indicating that current initial production ratios do not well describe the
r-process event in Reticulum II. The abundance of light elements up to Zn are
consistent with extremely metal-poor Milky Way halo stars. They may eventually
provide a way to distinguish between neutron star mergers and
magneto-rotationally driven jet supernovae, but this would require more
detailed knowledge of the chemical evolution of Reticulum II.
| astro-ph.SR astro-ph.GA | the ultrafaint dwarf galaxy reticulum ii was enriched by a rare and prolific rprocess event such as a neutron star merger to investigate the nature of this event we present highresolution magellanmike spectroscopy of the brightest star in this galaxy the high signaltonoise allows us to determine the abundances of 41 elements including the radioactive actinide element th and first ever detections of third rprocess peak elements os and ir in a star outside the milky way the observed neutroncapture element abundances closely match the solar rprocess component except for the first rprocess peak which is significantly lower than solar but matches other rprocess enhanced stars the ratio of first peak to heavier rprocess elements implies the rprocess site produces roughly equal masses of high and low electron fraction ejecta within a factor of 2 we compare the detailed abundance pattern to predictions from nucleosynthesis calculations of neutron star mergers and magnetorotationally driven jet supernovae finding that nuclear physics uncertainties dominate over astrophysical uncertainties we measure logmboxtheu 084 pm 006textstat pm 022textsys somewhat lower than all previous theu observations the youngest age we derive from this ratio is 217 pm 28textstat pm 103textsys gyr indicating that current initial production ratios do not well describe the rprocess event in reticulum ii the abundance of light elements up to zn are consistent with extremely metalpoor milky way halo stars they may eventually provide a way to distinguish between neutron star mergers and magnetorotationally driven jet supernovae but this would require more detailed knowledge of the chemical evolution of reticulum ii | [['the', 'ultrafaint', 'dwarf', 'galaxy', 'reticulum', 'ii', 'was', 'enriched', 'by', 'a', 'rare', 'and', 'prolific', 'rprocess', 'event', 'such', 'as', 'a', 'neutron', 'star', 'merger', 'to', 'investigate', 'the', 'nature', 'of', 'this', 'event', 'we', 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1,802.07273 | Axion interferometry | We propose using interferometry of circularly polarized light as a mechanism
by which to test for axion dark matter. These interferometers differ from
standard interferometers only by the addition of a few quarter waveplates to
preserve the polarization of light upon reflection. We show that using current
technology, interferometers can probe new regions of axion parameter space up
to a couple orders of magnitude beyond current constraints.
| hep-ph | we propose using interferometry of circularly polarized light as a mechanism by which to test for axion dark matter these interferometers differ from standard interferometers only by the addition of a few quarter waveplates to preserve the polarization of light upon reflection we show that using current technology interferometers can probe new regions of axion parameter space up to a couple orders of magnitude beyond current constraints | [['we', 'propose', 'using', 'interferometry', 'of', 'circularly', 'polarized', 'light', 'as', 'a', 'mechanism', 'by', 'which', 'to', 'test', 'for', 'axion', 'dark', 'matter', 'these', 'interferometers', 'differ', 'from', 'standard', 'interferometers', 'only', 'by', 'the', 'addition', 'of', 'a', 'few', 'quarter', 'waveplates', 'to', 'preserve', 'the', 'polarization', 'of', 'light', 'upon', 'reflection', 'we', 'show', 'that', 'using', 'current', 'technology', 'interferometers', 'can', 'probe', 'new', 'regions', 'of', 'axion', 'parameter', 'space', 'up', 'to', 'a', 'couple', 'orders', 'of', 'magnitude', 'beyond', 'current', 'constraints']] | [-0.11560846844326648, 0.1946035621986627, -0.07731227764387184, 0.0426051152953461, -0.09849461874187883, -0.124238311778754, 0.07081167618813577, 0.4008329527369186, -0.2730779133514682, -0.38006444453303495, 0.07123798608724306, -0.2312744606925703, -0.06617276625596542, 0.26494802301749587, 0.01678001686041035, 0.019722995367387672, -0.01358457860439571, -0.05321912467479706, -0.07734634108327107, -0.2139669497177672, 0.3113235964842919, 0.01756187287895982, 0.23034197634169415, -0.010222190462831241, 0.12158783928338271, -0.018836267146546005, -0.04350460509755718, -0.012650038706878922, -0.06678753412633165, 0.09788508375467204, 0.1672693774340424, 0.09514385785337594, 0.16566340297585658, -0.4719786676230715, -0.22856831987068724, 0.10361218084094685, 0.12029716041575034, 0.14835745384464902, -0.03681963406948011, -0.324820826038607, 0.009450800616099542, -0.18459361606736235, -0.14450428227602102, -0.08835949882197736, -0.03652679474690734, 0.014844284021059301, -0.23526034363781784, 0.01862106709254544, -0.04293188138573027, -0.07165076596829206, 0.022312204961651073, -0.09556171753263074, 0.017272773511540978, 0.001138586325070529, 0.02325075887640549, 0.05855044767038146, 0.1661233702577206, -0.18598596214441887, -0.14693515272394045, 0.38609289380707845, -0.17186321648977584, -0.10355792417010265, 0.13144382499436388, -0.20625198392002886, -0.06289463955213997, 0.1220660671146948, 0.1806477875685069, 0.12678670354965907, -0.10996248200535774, 0.04586065039316665, -0.0400853002541212, 0.2301440770501521, 0.1453651862302378, 0.11791929821553293, 0.34785052894878743, 0.18554259415493526, 0.10180484217160674, 0.09718082350359034, -0.13060892180108757, -0.028154968979087338, -0.31627131383449064, -0.09318013476736065, -0.14256349547919053, 0.040553009915930124, -0.039373740546905726, -0.08703860345838675, 0.4090995853280287, 0.1980196922781196, 0.13707533463446506, -0.03142762347993288, 0.36615203332100343, 0.07979972158565617, 0.11060080285281387, -0.024547518731386803, 0.36131830574638807, 0.1171844364143908, 0.07977851994558056, -0.18093800581227154, -0.0417073674764095, -0.010866220699929034] |
1,802.07274 | Type IIB 7-branes in warped $AdS_6$: partition functions, brane webs and
probe limit | We study Type IIB supergravity solutions with spacetime of the form
$AdS_6\times S^2$ warped over a Riemann surface $\Sigma$, where $\Sigma$
includes punctures around which the supergravity fields have non-trivial
$SL(2,R)$ monodromy. Solutions without monodromy have a compelling
interpretation as near-horizon limits of $(p,q)$ 5-brane webs, and the
punctures have been interpreted as additional 7-branes in the web. In this work
we provide further support for this interpretation and clarify several aspects
of the identification of the supergravity solutions with brane webs. To further
support the identification of the punctures with 7-branes, we show that
punctures with infinitesimal monodromy match a probe 7-brane analysis using
$\kappa$-symmetry. We then construct families of solutions with fixed 5-brane
charges and punctures with finite monodromy, corresponding to fully backreacted
7-branes. We compute the sphere partition functions of the dual 5d SCFTs and
use the results to discuss concrete brane web interpretations of the
supergravity solutions.
| hep-th | we study type iib supergravity solutions with spacetime of the form ads_6times s2 warped over a riemann surface sigma where sigma includes punctures around which the supergravity fields have nontrivial sl2r monodromy solutions without monodromy have a compelling interpretation as nearhorizon limits of pq 5brane webs and the punctures have been interpreted as additional 7branes in the web in this work we provide further support for this interpretation and clarify several aspects of the identification of the supergravity solutions with brane webs to further support the identification of the punctures with 7branes we show that punctures with infinitesimal monodromy match a probe 7brane analysis using kappasymmetry we then construct families of solutions with fixed 5brane charges and punctures with finite monodromy corresponding to fully backreacted 7branes we compute the sphere partition functions of the dual 5d scfts and use the results to discuss concrete brane web interpretations of the supergravity solutions | [['we', 'study', 'type', 'iib', 'supergravity', 'solutions', 'with', 'spacetime', 'of', 'the', 'form', 'ads_6times', 's2', 'warped', 'over', 'a', 'riemann', 'surface', 'sigma', 'where', 'sigma', 'includes', 'punctures', 'around', 'which', 'the', 'supergravity', 'fields', 'have', 'nontrivial', 'sl2r', 'monodromy', 'solutions', 'without', 'monodromy', 'have', 'a', 'compelling', 'interpretation', 'as', 'nearhorizon', 'limits', 'of', 'pq', '5brane', 'webs', 'and', 'the', 'punctures', 'have', 'been', 'interpreted', 'as', 'additional', '7branes', 'in', 'the', 'web', 'in', 'this', 'work', 'we', 'provide', 'further', 'support', 'for', 'this', 'interpretation', 'and', 'clarify', 'several', 'aspects', 'of', 'the', 'identification', 'of', 'the', 'supergravity', 'solutions', 'with', 'brane', 'webs', 'to', 'further', 'support', 'the', 'identification', 'of', 'the', 'punctures', 'with', '7branes', 'we', 'show', 'that', 'punctures', 'with', 'infinitesimal', 'monodromy', 'match', 'a', 'probe', '7brane', 'analysis', 'using', 'kappasymmetry', 'we', 'then', 'construct', 'families', 'of', 'solutions', 'with', 'fixed', '5brane', 'charges', 'and', 'punctures', 'with', 'finite', 'monodromy', 'corresponding', 'to', 'fully', 'backreacted', '7branes', 'we', 'compute', 'the', 'sphere', 'partition', 'functions', 'of', 'the', 'dual', '5d', 'scfts', 'and', 'use', 'the', 'results', 'to', 'discuss', 'concrete', 'brane', 'web', 'interpretations', 'of', 'the', 'supergravity', 'solutions']] | [-0.16077420626156377, 0.042271751303700665, -0.05858401679094659, 0.09035769425523744, -0.13270447484712156, -0.1595662745758151, -0.014459034218298679, 0.2787802443278349, -0.13856500256128165, -0.26368531886340174, 0.14268780423217262, -0.30239377454515326, -0.1755490461348969, 0.1012672454747834, -0.10667622448962848, 0.010176112218482407, 0.004675546906185367, 0.0508888667768919, -0.1295585075226791, -0.2773396760820479, 0.38640154662791837, -0.04359824551479114, 0.23350762538858597, 0.03656798187297899, 0.0983023601738329, -0.04954070834726687, 0.001833874581147306, -0.01517123980324296, -0.18015529928476062, 0.1436507853552921, 0.26571130746858357, 0.11136918842163405, 0.03569134668946661, -0.49824450594305203, -0.24127375995061848, 0.13775648901374726, 0.22723501844837374, 0.10953233051437589, -0.031699475246352075, -0.30540652788978145, 0.07997332152444869, -0.1770152176440453, -0.21416343028798995, -0.09588242186517115, 0.005829905492827197, -0.04371126130722858, -0.17986308724237052, -0.00239896820241351, -0.011430412705907512, 0.062140222342795884, -0.11632846625188724, -0.04827210206221573, -0.13260786390450124, 0.06557600293154305, 0.1913833800558346, 0.03417767060840416, 0.09926156507225226, -0.17598196062635604, -0.16345802018463623, 0.301452110897725, -0.05681548918911953, -0.2640655739541283, 0.15255545157112724, -0.10456365347602435, -0.20692941610584195, 0.12003158571951042, 0.09968000332769376, 0.1734415834709086, -0.09743596001571378, 0.25208750397848917, -0.06161660943889608, 0.11850706399387576, 0.1388883330668045, 0.017455969502322918, 0.3011075367484957, 0.10929350750459148, 0.03286777623922916, 0.15492097434390412, -0.007744044883081085, -0.056249841079362574, -0.46580299274650533, -0.17312757386548433, -0.06136905950407763, 0.15282754084197125, -0.20314313071611836, -0.22059064166965764, 0.38743462977122933, 0.08502478547554636, 0.20761627360055876, 0.09047305950392284, 0.1493395571134343, 0.04700944791486277, 0.08988010334714458, 0.0450627939430195, 0.199284910308413, 0.12706014938307125, 0.03718934340991499, -0.1936361149897096, -0.18494504511808138, 0.21668840429147349] |
1,802.07275 | Phase transitions in 3D gravity and fractal dimension | We show that for three dimensional gravity with higher genus boundary
conditions, if the theory possesses a sufficiently light scalar, there is a
second order phase transition where the scalar field condenses. This three
dimensional version of the holographic superconducting phase transition occurs
even though the pure gravity solutions are locally AdS$_3$. This is in addition
to the first order Hawking-Page-like phase transitions between different
locally AdS$_3$ handlebodies. This implies that the R\'enyi entropies of
holographic CFTs will undergo phase transitions as the R\'enyi parameter is
varied, as long as the theory possesses a scalar operator which is lighter than
a certain critical dimension. We show that this critical dimension has an
elegant mathematical interpretation as the Hausdorff dimension of the limit set
of a quotient group of AdS$_3$, and use this to compute it, analytically near
the boundary of moduli space and numerically in the interior of moduli space.
We compare this to a CFT computation generalizing recent work of Belin, Keller
and Zadeh, bounding the critical dimension using higher genus conformal blocks,
and find a surprisingly good match.
| hep-th gr-qc math.GT | we show that for three dimensional gravity with higher genus boundary conditions if the theory possesses a sufficiently light scalar there is a second order phase transition where the scalar field condenses this three dimensional version of the holographic superconducting phase transition occurs even though the pure gravity solutions are locally ads_3 this is in addition to the first order hawkingpagelike phase transitions between different locally ads_3 handlebodies this implies that the renyi entropies of holographic cfts will undergo phase transitions as the renyi parameter is varied as long as the theory possesses a scalar operator which is lighter than a certain critical dimension we show that this critical dimension has an elegant mathematical interpretation as the hausdorff dimension of the limit set of a quotient group of ads_3 and use this to compute it analytically near the boundary of moduli space and numerically in the interior of moduli space we compare this to a cft computation generalizing recent work of belin keller and zadeh bounding the critical dimension using higher genus conformal blocks and find a surprisingly good match | [['we', 'show', 'that', 'for', 'three', 'dimensional', 'gravity', 'with', 'higher', 'genus', 'boundary', 'conditions', 'if', 'the', 'theory', 'possesses', 'a', 'sufficiently', 'light', 'scalar', 'there', 'is', 'a', 'second', 'order', 'phase', 'transition', 'where', 'the', 'scalar', 'field', 'condenses', 'this', 'three', 'dimensional', 'version', 'of', 'the', 'holographic', 'superconducting', 'phase', 'transition', 'occurs', 'even', 'though', 'the', 'pure', 'gravity', 'solutions', 'are', 'locally', 'ads_3', 'this', 'is', 'in', 'addition', 'to', 'the', 'first', 'order', 'hawkingpagelike', 'phase', 'transitions', 'between', 'different', 'locally', 'ads_3', 'handlebodies', 'this', 'implies', 'that', 'the', 'renyi', 'entropies', 'of', 'holographic', 'cfts', 'will', 'undergo', 'phase', 'transitions', 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-0.05600387805503111, 0.18738195697605278] |
1,802.07276 | The SINS/zC-SINF survey of z~2 galaxy kinematics: SINFONI adaptive
optics-assisted data and kiloparsec-scale emission line properties | We present the "SINS/zC-SINF AO survey" of 35 star-forming galaxies, the
largest sample with deep adaptive optics-assisted (AO) near-infrared integral
field spectroscopy at z~2. The observations, taken with SINFONI at the Very
Large Telescope, resolve the Ha and [NII] line emission and kinematics on
scales of ~1.5 kpc. In stellar mass, star formation rate, rest-optical colors
and size, the AO sample is representative of its parent seeing-limited sample
and probes the massive (M* ~ 2x10^9 - 3x10^11 Msun), actively star-forming (SFR
~ 10-600 Msun/yr) part of the z~2 galaxy population over a wide range in colors
((U-V)_rest ~ 0.15-1.5 mag) and half-light radii (R_e,H ~ 1-8.5 kpc). The
sample overlaps largely with the "main sequence" of star-forming galaxies in
the same redshift range to a similar K_AB = 23 magnitude limit; it has ~0.3 dex
higher median specific SFR, ~0.1 mag bluer median (U-V)_rest color, and ~10%
larger median rest-optical size. We describe the observations, data reduction,
and extraction of basic flux and kinematic properties. With typically 3-4 times
higher resolution and 4-5 times longer integrations (up to 23hr) than the
seeing-limited datasets of the same objects, the AO data reveal much more
detail in morphology and kinematics. The now complete AO observations confirm
the majority of kinematically-classified disks and the typically elevated disk
velocity dispersions previously reported based on subsets of the data. We
derive typically flat or slightly negative radial [NII]/Ha gradients, with no
significant trend with global galaxy properties, kinematic nature, or the
presence of an AGN. Azimuthal variations in [NII]/Ha are seen in several
sources and are associated with ionized gas outflows, and possible more
metal-poor star-forming clumps or small companions. [Abridged]
| astro-ph.GA | we present the sinszcsinf ao survey of 35 starforming galaxies the largest sample with deep adaptive opticsassisted ao nearinfrared integral field spectroscopy at z2 the observations taken with sinfoni at the very large telescope resolve the ha and nii line emission and kinematics on scales of 15 kpc in stellar mass star formation rate restoptical colors and size the ao sample is representative of its parent seeinglimited sample and probes the massive m 2x109 3x1011 msun actively starforming sfr 10600 msunyr part of the z2 galaxy population over a wide range in colors uv_rest 01515 mag and halflight radii r_eh 185 kpc the sample overlaps largely with the main sequence of starforming galaxies in the same redshift range to a similar k_ab 23 magnitude limit it has 03 dex higher median specific sfr 01 mag bluer median uv_rest color and 10 larger median restoptical size we describe the observations data reduction and extraction of basic flux and kinematic properties with typically 34 times higher resolution and 45 times longer integrations up to 23hr than the seeinglimited datasets of the same objects the ao data reveal much more detail in morphology and kinematics the now complete ao observations confirm the majority of kinematicallyclassified disks and the typically elevated disk velocity dispersions previously reported based on subsets of the data we derive typically flat or slightly negative radial niiha gradients with no significant trend with global galaxy properties kinematic nature or the presence of an agn azimuthal variations in niiha are seen in several sources and are associated with ionized gas outflows and possible more metalpoor starforming clumps or small companions abridged | [['we', 'present', 'the', 'sinszcsinf', 'ao', 'survey', 'of', '35', 'starforming', 'galaxies', 'the', 'largest', 'sample', 'with', 'deep', 'adaptive', 'opticsassisted', 'ao', 'nearinfrared', 'integral', 'field', 'spectroscopy', 'at', 'z2', 'the', 'observations', 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1,802.07277 | Exploring the limits of AGN feedback: black holes and the star formation
histories of low-mass galaxies | Energy feedback, either from active galactic nuclei (AGN) or from supernovae,
is required to understand galaxy formation within a $\Lambda$-Cold Dark Matter
cosmology. We study a sample of 127 low-mass galaxies, comparing their stellar
populations properties to the mass of the central supermassive black hole, in
order to investigate the effect of AGN feedback. We find a loose coupling
between star formation history and black hole mass, which seems to suggest that
AGN activity does not dominate baryonic cooling in low-mass galaxies. We also
find that a break in the $M_\bullet$-$\sigma$ relation marks a transitional
stellar mass, M$_\mathrm{trans}=3.4\pm2.1 \times 10^{10}$ M$_{\odot}$,
remarkably similar to M$_\star$. Our results are in agreement with a bi-modal
star formation process where the AGN-dominated feedback of high-mass galaxies
transitions towards a supernovae-driven regime in low-mass systems, as
suggested by numerical simulations.
| astro-ph.GA | energy feedback either from active galactic nuclei agn or from supernovae is required to understand galaxy formation within a lambdacold dark matter cosmology we study a sample of 127 lowmass galaxies comparing their stellar populations properties to the mass of the central supermassive black hole in order to investigate the effect of agn feedback we find a loose coupling between star formation history and black hole mass which seems to suggest that agn activity does not dominate baryonic cooling in lowmass galaxies we also find that a break in the m_bulletsigma relation marks a transitional stellar mass m_mathrmtrans34pm21 times 1010 m_odot remarkably similar to m_star our results are in agreement with a bimodal star formation process where the agndominated feedback of highmass galaxies transitions towards a supernovaedriven regime in lowmass systems as suggested by numerical simulations | [['energy', 'feedback', 'either', 'from', 'active', 'galactic', 'nuclei', 'agn', 'or', 'from', 'supernovae', 'is', 'required', 'to', 'understand', 'galaxy', 'formation', 'within', 'a', 'lambdacold', 'dark', 'matter', 'cosmology', 'we', 'study', 'a', 'sample', 'of', '127', 'lowmass', 'galaxies', 'comparing', 'their', 'stellar', 'populations', 'properties', 'to', 'the', 'mass', 'of', 'the', 'central', 'supermassive', 'black', 'hole', 'in', 'order', 'to', 'investigate', 'the', 'effect', 'of', 'agn', 'feedback', 'we', 'find', 'a', 'loose', 'coupling', 'between', 'star', 'formation', 'history', 'and', 'black', 'hole', 'mass', 'which', 'seems', 'to', 'suggest', 'that', 'agn', 'activity', 'does', 'not', 'dominate', 'baryonic', 'cooling', 'in', 'lowmass', 'galaxies', 'we', 'also', 'find', 'that', 'a', 'break', 'in', 'the', 'm_bulletsigma', 'relation', 'marks', 'a', 'transitional', 'stellar', 'mass', 'm_mathrmtrans34pm21', 'times', '1010', 'm_odot', 'remarkably', 'similar', 'to', 'm_star', 'our', 'results', 'are', 'in', 'agreement', 'with', 'a', 'bimodal', 'star', 'formation', 'process', 'where', 'the', 'agndominated', 'feedback', 'of', 'highmass', 'galaxies', 'transitions', 'towards', 'a', 'supernovaedriven', 'regime', 'in', 'lowmass', 'systems', 'as', 'suggested', 'by', 'numerical', 'simulations']] | [-0.06404937815473036, 0.12688277297204845, -0.06490300934658283, 0.1841882684954288, -0.11417150321175103, -0.048173067089239206, 0.07769521665069516, 0.4074273182010209, -0.07145778650624884, -0.3707445720348645, -0.002341220453726473, -0.2766998954444986, -0.0064231530211314005, 0.18516328234949875, -0.030353598099612068, -0.06412339538887694, 0.011495063453912735, -0.08835788217925088, -0.05390605713171816, -0.24877038334530813, 0.340156391221616, 0.0896482947523947, 0.12459885435937731, -0.060812637047773156, 0.04129873144060925, -0.15478600623879443, -0.043767726228193, -0.058359797620559456, -0.22672285513092194, -0.06324911643923432, 0.2727622161446898, 0.10392471253871918, 0.2564396415474928, -0.35988443729061315, -0.22659884053109972, 0.10762307905695505, 0.2564964738846929, 0.08412267789503353, -0.20362237283994478, -0.2236265221817626, 0.050398129781414926, -0.24730286049846284, -0.14470787081022368, 0.09496781291371142, 0.02538023215753061, 0.0323606901639222, -0.24381074078932957, 0.21742422223173047, 0.05129258752697044, -0.027391320039276724, -0.12399684904246694, -0.00737127436807862, -0.1154070571910038, 0.054066609386872085, 0.04287945246819786, 0.09260421949783686, 0.27827923521054565, -0.17944132583560768, -0.05335059481914397, 0.4204833951916684, -0.011066579478102977, 0.03606753630037592, 0.26705525572308236, -0.26388744551481474, -0.21310350909415218, 0.09803003923001664, 0.18331869224914246, 0.1092578817607352, -0.15615305207255814, -0.039405607010013666, -7.97137945752453e-05, 0.26927703837691636, -0.01624492482256351, 0.05148980755459181, 0.4257783045716308, 0.15736428528713683, -0.0050761162406868406, 0.061423285164939306, -0.12220719198920522, -0.08554482373443467, -0.1922805092021547, -0.06260370568682751, -0.10612625720462314, 0.14300155826268665, -0.1553171759504713, -0.08462025522840795, 0.2832286949924849, 0.07415851758172115, 0.2654570095999925, 0.08369974866768139, 0.282135815711485, 0.03555444576260117, 0.11316190593944932, 0.13303653618527783, 0.366311556942485, 0.20840714214266173, 0.04977438540749804, -0.3280928665496133, 0.030734724127170113, 0.013497828557673428] |
1,802.07278 | Exactly solvable gravitating perfect fluid solitons in (2+1) dimensions | The Bogomolnyi-Prasad-Sommerfield (BPS) baby Skyrme model coupled to gravity
is considered. We show that in an asymptotically flat space-time the model
still possesses the BPS property, i.e., admits a BPS reduction to first order
Bogomolnyi equations, which guarantees that the corresponding proper energy is
a linear function of the topological charge. We also find the mass-radius
relation as well as the maximal mass and radius. All these results are obtained
in an analytical manner, which implies the complete solvability of this
selfgravitating matter system. If a cosmological constant is added, then the
BPS property is lost. In de Sitter (dS) space-time both extremal and
non-extremal solutions are found, where the former correspond to finite
positive pressure solutions of the flat space-time model. For the asymptotic
anti-de Sitter (AdS) case, extremal solutions do not exist as there are no
negative pressure BPS baby Skyrmions in flat space-time. Non-extremal solutions
with AdS asymptotics do exist and may be constructed numerically. The impact of
the negative cosmological constant on the mass-radius relation is studied. We
also found two potentials for which exact multi-soliton solutions in the
external AdS space can be obtained. Finally, we elaborate on the implications
of these findings for certain three-dimensional models of holographic QCD.
| hep-th gr-qc | the bogomolnyiprasadsommerfield bps baby skyrme model coupled to gravity is considered we show that in an asymptotically flat spacetime the model still possesses the bps property ie admits a bps reduction to first order bogomolnyi equations which guarantees that the corresponding proper energy is a linear function of the topological charge we also find the massradius relation as well as the maximal mass and radius all these results are obtained in an analytical manner which implies the complete solvability of this selfgravitating matter system if a cosmological constant is added then the bps property is lost in de sitter ds spacetime both extremal and nonextremal solutions are found where the former correspond to finite positive pressure solutions of the flat spacetime model for the asymptotic antide sitter ads case extremal solutions do not exist as there are no negative pressure bps baby skyrmions in flat spacetime nonextremal solutions with ads asymptotics do exist and may be constructed numerically the impact of the negative cosmological constant on the massradius relation is studied we also found two potentials for which exact multisoliton solutions in the external ads space can be obtained finally we elaborate on the implications of these findings for certain threedimensional models of holographic qcd | [['the', 'bogomolnyiprasadsommerfield', 'bps', 'baby', 'skyrme', 'model', 'coupled', 'to', 'gravity', 'is', 'considered', 'we', 'show', 'that', 'in', 'an', 'asymptotically', 'flat', 'spacetime', 'the', 'model', 'still', 'possesses', 'the', 'bps', 'property', 'ie', 'admits', 'a', 'bps', 'reduction', 'to', 'first', 'order', 'bogomolnyi', 'equations', 'which', 'guarantees', 'that', 'the', 'corresponding', 'proper', 'energy', 'is', 'a', 'linear', 'function', 'of', 'the', 'topological', 'charge', 'we', 'also', 'find', 'the', 'massradius', 'relation', 'as', 'well', 'as', 'the', 'maximal', 'mass', 'and', 'radius', 'all', 'these', 'results', 'are', 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1,802.07279 | Angular momentum transfer in primordial discs and the rotation of the
first stars | We investigate the rotation velocity of the first stars by modelling the
angular momentum transfer in the primordial accretion disc.Assessing the impact
of magnetic braking, we consider the transition in angular momentum transport
mode at the Alfv$\acute{\rm e}$n radius, from the dynamically dominated
free-fall accretion to the magnetically dominated solid-body one.The accreting
protostar at the centre of the primordial star-forming cloud rotates with close
to breakup speed in the case without magnetic fields.Considering a
physically-motivated model for small-scale turbulent dynamo amplification, we
find that stellar rotation speed quickly declines if a large fraction of the
initial turbulent energy is converted to magnetic energy ($\gtrsim 0.14$).
Alternatively, if the dynamo process were inefficient, for amplification due to
flux-freezing, stars would become slow rotators if the pre-galactic magnetic
field strength is above a critical value, $\simeq 10^{-8.2}$G, evaluated at a
scale of $n_{\rm H} = 1 {\rm cm}^{-3}$, which is significantly higher than
plausible cosmological seed values ($\sim 10^{-15}$G). Because of the rapid
decline of the stellar rotational speed over a narrow range in model
parameters, the first stars encounter a bimodal fate: rapid rotation at almost
the breakup level, or the near absence of any rotation.
| astro-ph.GA | we investigate the rotation velocity of the first stars by modelling the angular momentum transfer in the primordial accretion discassessing the impact of magnetic braking we consider the transition in angular momentum transport mode at the alfvacuterm en radius from the dynamically dominated freefall accretion to the magnetically dominated solidbody onethe accreting protostar at the centre of the primordial starforming cloud rotates with close to breakup speed in the case without magnetic fieldsconsidering a physicallymotivated model for smallscale turbulent dynamo amplification we find that stellar rotation speed quickly declines if a large fraction of the initial turbulent energy is converted to magnetic energy gtrsim 014 alternatively if the dynamo process were inefficient for amplification due to fluxfreezing stars would become slow rotators if the pregalactic magnetic field strength is above a critical value simeq 1082g evaluated at a scale of n_rm h 1 rm cm3 which is significantly higher than plausible cosmological seed values sim 1015g because of the rapid decline of the stellar rotational speed over a narrow range in model parameters the first stars encounter a bimodal fate rapid rotation at almost the breakup level or the near absence of any rotation | [['we', 'investigate', 'the', 'rotation', 'velocity', 'of', 'the', 'first', 'stars', 'by', 'modelling', 'the', 'angular', 'momentum', 'transfer', 'in', 'the', 'primordial', 'accretion', 'discassessing', 'the', 'impact', 'of', 'magnetic', 'braking', 'we', 'consider', 'the', 'transition', 'in', 'angular', 'momentum', 'transport', 'mode', 'at', 'the', 'alfvacuterm', 'en', 'radius', 'from', 'the', 'dynamically', 'dominated', 'freefall', 'accretion', 'to', 'the', 'magnetically', 'dominated', 'solidbody', 'onethe', 'accreting', 'protostar', 'at', 'the', 'centre', 'of', 'the', 'primordial', 'starforming', 'cloud', 'rotates', 'with', 'close', 'to', 'breakup', 'speed', 'in', 'the', 'case', 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1,802.0728 | Simulating the Ridesharing Economy: The Individual Agent
Metro-Washington Area Ridesharing Model | The ridesharing economy is experiencing rapid growth and innovation.
Companies such as Uber and Lyft are continuing to grow at a considerable pace
while providing their platform as an organizing medium for ridesharing
services, increasing consumer utility as well as employing thousands in
part-time positions. However, many challenges remain in the modeling of
ridesharing services, many of which are not currently under wide consideration.
In this paper, an agent-based model is developed to simulate a ridesharing
service in the Washington D.C. metropolitan region. The model is used to
examine levels of utility gained for both riders (customers) and drivers
(service providers) of a generic ridesharing service. A description of the
Individual Agent Metro-Washington Area Ridesharing Model (IAMWARM) is provided,
as well as a description of a typical simulation run. We investigate the
financial gains of drivers for a 24-hour period under two scenarios and two
spatial movement behaviors. The two spatial behaviors were random movement and
Voronoi movement, which we describe. Both movement behaviors were tested under
a stationary run conditions scenario and a variable run conditions scenario. We
find that Voronoi movement increased drivers' utility gained but that emergence
of this system property was only viable under variable scenario conditions.
This result provides two important insights: The first is that driver movement
decisions prior to passenger pickup can impact financial gain for the service
and drivers, and consequently, rate of successful pickup for riders. The second
is that this phenomenon is only evident under experimentation conditions where
variability in passenger and driver arrival rates are administered.
| cs.MA nlin.AO | the ridesharing economy is experiencing rapid growth and innovation companies such as uber and lyft are continuing to grow at a considerable pace while providing their platform as an organizing medium for ridesharing services increasing consumer utility as well as employing thousands in parttime positions however many challenges remain in the modeling of ridesharing services many of which are not currently under wide consideration in this paper an agentbased model is developed to simulate a ridesharing service in the washington dc metropolitan region the model is used to examine levels of utility gained for both riders customers and drivers service providers of a generic ridesharing service a description of the individual agent metrowashington area ridesharing model iamwarm is provided as well as a description of a typical simulation run we investigate the financial gains of drivers for a 24hour period under two scenarios and two spatial movement behaviors the two spatial behaviors were random movement and voronoi movement which we describe both movement behaviors were tested under a stationary run conditions scenario and a variable run conditions scenario we find that voronoi movement increased drivers utility gained but that emergence of this system property was only viable under variable scenario conditions this result provides two important insights the first is that driver movement decisions prior to passenger pickup can impact financial gain for the service and drivers and consequently rate of successful pickup for riders the second is that this phenomenon is only evident under experimentation conditions where variability in passenger and driver arrival rates are administered | [['the', 'ridesharing', 'economy', 'is', 'experiencing', 'rapid', 'growth', 'and', 'innovation', 'companies', 'such', 'as', 'uber', 'and', 'lyft', 'are', 'continuing', 'to', 'grow', 'at', 'a', 'considerable', 'pace', 'while', 'providing', 'their', 'platform', 'as', 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1,802.07281 | Fairness of Exposure in Rankings | Rankings are ubiquitous in the online world today. As we have transitioned
from finding books in libraries to ranking products, jobs, job applicants,
opinions and potential romantic partners, there is a substantial precedent that
ranking systems have a responsibility not only to their users but also to the
items being ranked. To address these often conflicting responsibilities, we
propose a conceptual and computational framework that allows the formulation of
fairness constraints on rankings in terms of exposure allocation. As part of
this framework, we develop efficient algorithms for finding rankings that
maximize the utility for the user while provably satisfying a specifiable
notion of fairness. Since fairness goals can be application specific, we show
how a broad range of fairness constraints can be implemented using our
framework, including forms of demographic parity, disparate treatment, and
disparate impact constraints. We illustrate the effect of these constraints by
providing empirical results on two ranking problems.
| cs.IR cs.CY | rankings are ubiquitous in the online world today as we have transitioned from finding books in libraries to ranking products jobs job applicants opinions and potential romantic partners there is a substantial precedent that ranking systems have a responsibility not only to their users but also to the items being ranked to address these often conflicting responsibilities we propose a conceptual and computational framework that allows the formulation of fairness constraints on rankings in terms of exposure allocation as part of this framework we develop efficient algorithms for finding rankings that maximize the utility for the user while provably satisfying a specifiable notion of fairness since fairness goals can be application specific we show how a broad range of fairness constraints can be implemented using our framework including forms of demographic parity disparate treatment and disparate impact constraints we illustrate the effect of these constraints by providing empirical results on two ranking problems | [['rankings', 'are', 'ubiquitous', 'in', 'the', 'online', 'world', 'today', 'as', 'we', 'have', 'transitioned', 'from', 'finding', 'books', 'in', 'libraries', 'to', 'ranking', 'products', 'jobs', 'job', 'applicants', 'opinions', 'and', 'potential', 'romantic', 'partners', 'there', 'is', 'a', 'substantial', 'precedent', 'that', 'ranking', 'systems', 'have', 'a', 'responsibility', 'not', 'only', 'to', 'their', 'users', 'but', 'also', 'to', 'the', 'items', 'being', 'ranked', 'to', 'address', 'these', 'often', 'conflicting', 'responsibilities', 'we', 'propose', 'a', 'conceptual', 'and', 'computational', 'framework', 'that', 'allows', 'the', 'formulation', 'of', 'fairness', 'constraints', 'on', 'rankings', 'in', 'terms', 'of', 'exposure', 'allocation', 'as', 'part', 'of', 'this', 'framework', 'we', 'develop', 'efficient', 'algorithms', 'for', 'finding', 'rankings', 'that', 'maximize', 'the', 'utility', 'for', 'the', 'user', 'while', 'provably', 'satisfying', 'a', 'specifiable', 'notion', 'of', 'fairness', 'since', 'fairness', 'goals', 'can', 'be', 'application', 'specific', 'we', 'show', 'how', 'a', 'broad', 'range', 'of', 'fairness', 'constraints', 'can', 'be', 'implemented', 'using', 'our', 'framework', 'including', 'forms', 'of', 'demographic', 'parity', 'disparate', 'treatment', 'and', 'disparate', 'impact', 'constraints', 'we', 'illustrate', 'the', 'effect', 'of', 'these', 'constraints', 'by', 'providing', 'empirical', 'results', 'on', 'two', 'ranking', 'problems']] | [-0.10594920291347745, 0.010908125194392222, -0.09076267805747883, 0.10407796248282287, -0.1733492190730484, -0.15853688917640182, 0.13003175773846556, 0.4323976633985058, -0.24880148558721427, -0.3873144686069899, 0.07263717054483766, -0.29174190916258347, -0.13719985463650397, 0.14201488603040383, -0.1322465685372746, 0.03845887964749648, 0.09028057232986089, 0.034600068233736785, -0.0006291304931449369, -0.35260878671097623, 0.32353018475939926, 0.05080663277067585, 0.30463186342549187, 0.10444256638061085, 0.06334133987053255, -0.018561607022812357, -0.05395354456199771, 0.07674099315943964, -0.09079982139666837, 0.15569843372232675, 0.36756571707790536, 0.27695793371793687, 0.3990297347453295, -0.3975777999175335, -0.16158622989637983, 0.11397231969178892, 0.10546523003589386, 0.04513498834103005, -0.046758036891582845, -0.2740242208348088, 0.0632353164651279, -0.24029490606116702, -0.003837538484386564, -0.11921233885306744, -0.02473539362046746, 0.03942515229573473, -0.2889957141794654, 0.014070604040456352, 0.018714831502472044, 0.05102934783896784, -0.06874671074891998, -0.14090821765259737, 0.027129566169867378, 0.17161008188907312, 0.11093888172325891, -0.06252487990670393, 0.1414489219649208, -0.14413660106529158, -0.19685278331033057, 0.4402581108140522, 1.2663789580460468e-05, -0.2000630518887192, 0.17746261171266145, -0.04728771055884221, -0.18693918275214683, 0.05800335538981397, 0.24338167628845553, 0.06999962339999483, -0.187010994707569, 0.01531423181881276, -0.06462825070214427, 0.1471276482258272, 0.06517066948079303, 0.05118486275013804, 0.2090979298482363, 0.15127891891946396, 0.1017502793263084, 0.0946430045783404, 0.03816240636351841, -0.12398879743923792, -0.2358799407599506, -0.13027750220289758, -0.1340797133545933, -0.002656584751569313, -0.09561476132992634, -0.1356140747666359, 0.3887680884377629, 0.18652807195905635, 0.1396627326380291, 0.11600570255141779, 0.31346102435068757, 0.05879596674592642, 0.07776886796170931, 0.08755136289165105, 0.18197211182944087, 0.008936545383596025, 0.11440784972065184, -0.14479210524472827, 0.14602586947795418, -0.011795111335327034] |
1,802.07282 | Phase diagram of Hubbard-Holstein model on 4-leg tube system at
quarter-filling | We derive an effective electronic Hamiltonian for square lattice
Hubbard-Holstein model (HHM) in the strong electron-electron (e-e) and
electron-phonon (e-ph) coupling regime and under non-adiabatic conditions
($t/\omega_0 \leq 1$), $t$ and $\omega_0$ being the electron hopping and phonon
frequency respectively. Using Density Matrix Renormalization Group method, we
simulate this effective electronic model on $4-$Leg cylinder system at
quarter-filling and present a phase diagram in $g-U$ plane where $g$ and $U$
are being the e-ph coupling constant and Hubbard on-site interaction
respectively. For larger $g$, we find cluster of spins i.e. phase separation
(PS) gives way to a charge density wave (CDW) phase made of NN singlets which
abruptly goes to another CDW phase as we increase $U$. But for smaller $g$, we
find a metallic phase sandwiched between PS and singlet CDW phase. This phase
is characterized by vanishing charge gap but finite spin gap -- suggesting a
singlet superconducting phase.
| cond-mat.str-el | we derive an effective electronic hamiltonian for square lattice hubbardholstein model hhm in the strong electronelectron ee and electronphonon eph coupling regime and under nonadiabatic conditions tomega_0 leq 1 t and omega_0 being the electron hopping and phonon frequency respectively using density matrix renormalization group method we simulate this effective electronic model on 4leg cylinder system at quarterfilling and present a phase diagram in gu plane where g and u are being the eph coupling constant and hubbard onsite interaction respectively for larger g we find cluster of spins ie phase separation ps gives way to a charge density wave cdw phase made of nn singlets which abruptly goes to another cdw phase as we increase u but for smaller g we find a metallic phase sandwiched between ps and singlet cdw phase this phase is characterized by vanishing charge gap but finite spin gap suggesting a singlet superconducting phase | [['we', 'derive', 'an', 'effective', 'electronic', 'hamiltonian', 'for', 'square', 'lattice', 'hubbardholstein', 'model', 'hhm', 'in', 'the', 'strong', 'electronelectron', 'ee', 'and', 'electronphonon', 'eph', 'coupling', 'regime', 'and', 'under', 'nonadiabatic', 'conditions', 'tomega_0', 'leq', '1', 't', 'and', 'omega_0', 'being', 'the', 'electron', 'hopping', 'and', 'phonon', 'frequency', 'respectively', 'using', 'density', 'matrix', 'renormalization', 'group', 'method', 'we', 'simulate', 'this', 'effective', 'electronic', 'model', 'on', '4leg', 'cylinder', 'system', 'at', 'quarterfilling', 'and', 'present', 'a', 'phase', 'diagram', 'in', 'gu', 'plane', 'where', 'g', 'and', 'u', 'are', 'being', 'the', 'eph', 'coupling', 'constant', 'and', 'hubbard', 'onsite', 'interaction', 'respectively', 'for', 'larger', 'g', 'we', 'find', 'cluster', 'of', 'spins', 'ie', 'phase', 'separation', 'ps', 'gives', 'way', 'to', 'a', 'charge', 'density', 'wave', 'cdw', 'phase', 'made', 'of', 'nn', 'singlets', 'which', 'abruptly', 'goes', 'to', 'another', 'cdw', 'phase', 'as', 'we', 'increase', 'u', 'but', 'for', 'smaller', 'g', 'we', 'find', 'a', 'metallic', 'phase', 'sandwiched', 'between', 'ps', 'and', 'singlet', 'cdw', 'phase', 'this', 'phase', 'is', 'characterized', 'by', 'vanishing', 'charge', 'gap', 'but', 'finite', 'spin', 'gap', 'suggesting', 'a', 'singlet', 'superconducting', 'phase']] | [-0.24986329990128675, 0.26167064567959947, -0.027284004910228154, 0.03669054019497708, -0.021829057817036906, -0.20790552212546268, 0.12268980263111492, 0.41727394628028075, -0.2546978260747467, -0.24256297651678324, -0.03325448107168389, -0.32486905048290887, -0.09587770900844286, 0.08297074242650221, 0.11223659084566559, -0.03446296656363605, -0.03056774644802014, -0.019708404176247616, -0.16372111735399814, -0.18327580123984566, 0.26773635674568746, -0.04763167072087526, 0.24528038524712126, 0.11732098345295526, 0.04525483563542366, 0.04895897265989333, 0.14641667905185993, -0.02048256325845917, -0.19349150615123412, -0.027543801687813053, 0.2555657405720558, -0.12701718076753118, 0.19723816105475028, -0.41160002441455923, -0.19388825865384812, 0.05551776293044289, 0.14753712921248127, 0.12308171375266587, -0.013624587824257711, -0.2861602544443061, 0.019732927481333415, -0.23296782650674383, -0.1058601432821403, -0.07492837508985152, 0.0508123857419317, -0.0415331846040984, -0.30545976939921576, 0.163181949252806, 0.013861301369033754, 0.052931432959157976, -0.04227888620768984, -0.14386100155223783, -0.08153072441928089, 0.0269258601590991, 0.025337547520175575, 0.13381390710671742, 0.11937519649664562, -0.08194334625732154, -0.014430898856371641, 0.34819635157783824, -0.08776074406380455, -0.07909438018687069, 0.13719775718947252, -0.17058088433307905, -0.04321288683762153, 0.15193285250628832, 0.07783835962414741, 0.051947337426245216, -0.10956079041662936, 0.1407866085631152, 0.04203939778584754, 0.22184136209543795, 0.01846537525765598, 0.081882737390697, 0.18754160296171904, 0.18479315298143775, 0.10993538164844116, 0.11615635339985601, -0.09683449092321098, -0.06880712901552519, -0.26479866528262697, -0.10662962974980474, -0.2309852163113343, 0.05751839973216799, -0.1091732433772025, -0.16462072126567365, 0.3950637856653581, 0.13116252213406066, 0.17359782419167458, -0.01914455709901328, 0.19844546970600882, 0.13952388460980727, 0.027716143520859382, 0.07368653072044254, 0.22947734965321917, 0.1939942143376296, 0.06464573276229203, -0.3185955002019182, -0.01839651300261418, 0.09735134563253571] |
1,802.07283 | Nonuniversality and strongly interacting two-level systems in glasses at
low temperatures | Recent experimental results showing untypical nonlinear absorption and marked
deviations from well known universality in the low temperature acoustic and
dielectric losses in amorphous solids prove the need for improving the
understanding of the nature of two-level systems (TLSs) in these materials.
Here we suggest the study of TLSs focused on their properties which are
nonuniversal. Our theoretical analysis shows that the standard tunneling model
and the recently suggested Two-TLS model provide markedly different predictions
for the experimental outcome of these studies. Our results may be directly
tested in disordered lattices, e.g KBr:CN, where there is ample theoretical
support for the validity of the Two-TLS model, as well as in amorphous solids.
Verification of our results in the latter will significantly enhance
understanding of the nature of TLSs in amorphous solids, and the ability to
manipulate them and reduce their destructive effect in various cutting edge
applications including superconducting qubits.
| cond-mat.dis-nn | recent experimental results showing untypical nonlinear absorption and marked deviations from well known universality in the low temperature acoustic and dielectric losses in amorphous solids prove the need for improving the understanding of the nature of twolevel systems tlss in these materials here we suggest the study of tlss focused on their properties which are nonuniversal our theoretical analysis shows that the standard tunneling model and the recently suggested twotls model provide markedly different predictions for the experimental outcome of these studies our results may be directly tested in disordered lattices eg kbrcn where there is ample theoretical support for the validity of the twotls model as well as in amorphous solids verification of our results in the latter will significantly enhance understanding of the nature of tlss in amorphous solids and the ability to manipulate them and reduce their destructive effect in various cutting edge applications including superconducting qubits | [['recent', 'experimental', 'results', 'showing', 'untypical', 'nonlinear', 'absorption', 'and', 'marked', 'deviations', 'from', 'well', 'known', 'universality', 'in', 'the', 'low', 'temperature', 'acoustic', 'and', 'dielectric', 'losses', 'in', 'amorphous', 'solids', 'prove', 'the', 'need', 'for', 'improving', 'the', 'understanding', 'of', 'the', 'nature', 'of', 'twolevel', 'systems', 'tlss', 'in', 'these', 'materials', 'here', 'we', 'suggest', 'the', 'study', 'of', 'tlss', 'focused', 'on', 'their', 'properties', 'which', 'are', 'nonuniversal', 'our', 'theoretical', 'analysis', 'shows', 'that', 'the', 'standard', 'tunneling', 'model', 'and', 'the', 'recently', 'suggested', 'twotls', 'model', 'provide', 'markedly', 'different', 'predictions', 'for', 'the', 'experimental', 'outcome', 'of', 'these', 'studies', 'our', 'results', 'may', 'be', 'directly', 'tested', 'in', 'disordered', 'lattices', 'eg', 'kbrcn', 'where', 'there', 'is', 'ample', 'theoretical', 'support', 'for', 'the', 'validity', 'of', 'the', 'twotls', 'model', 'as', 'well', 'as', 'in', 'amorphous', 'solids', 'verification', 'of', 'our', 'results', 'in', 'the', 'latter', 'will', 'significantly', 'enhance', 'understanding', 'of', 'the', 'nature', 'of', 'tlss', 'in', 'amorphous', 'solids', 'and', 'the', 'ability', 'to', 'manipulate', 'them', 'and', 'reduce', 'their', 'destructive', 'effect', 'in', 'various', 'cutting', 'edge', 'applications', 'including', 'superconducting', 'qubits']] | [-0.06743400112803405, 0.13327199768585463, -0.05634206283915167, 0.03880927620145182, -0.025517740570940077, -0.14464274292811752, 0.05978166141547263, 0.37239848107720414, -0.22705059349536896, -0.31597260932127635, 0.04969216290861368, -0.29283263785764574, -0.17901798098968963, 0.23894288493475566, -0.026851669132399062, 0.1043361755212148, 0.032149369021256764, -0.060073225114610974, -0.03812975424807519, -0.23345225414338833, 0.2708520324900746, 0.04349472121646007, 0.3357917831124117, 0.1197350386949256, -0.01896767081692815, -0.0032667079102247955, -0.0041247844321575635, 0.014076703356113284, -0.11268954768025044, 0.11513194952470561, 0.2748812560116251, 0.019872984453104436, 0.2040405240872254, -0.4844865298147003, -0.277275912531962, 0.055568729174944265, 0.12343508392911948, 0.13894562917063014, -0.07064571894006803, -0.27794962873061496, 0.05274853455950506, -0.12648106133099646, -0.12867706805467605, -0.1046320473589003, 0.006121455843094736, 0.04744869539281353, -0.21999936241656542, 0.07119928462741276, 0.12016542516493549, 0.06368744814768433, -0.09006836918337892, -0.1353819465947648, -0.012759817775804549, 0.0836716210283339, 0.03887010931891079, -0.03635839305973301, 0.1553728698908041, -0.1476932993469139, -0.15103242537550007, 0.40172389095028244, -0.03161881028364102, -0.11711409412324429, 0.2745664160178664, -0.14630960029860338, -0.11764890008295575, 0.0953079111299788, 0.16708033941065273, 0.07665768462931738, -0.11548008557409048, 0.04402468206341534, -0.025142030456724265, 0.143835941106081, 0.0029448140567789475, 0.09731317948860427, 0.2243987139252325, 0.21534243260510266, -0.03342325755084554, 0.14622276426370567, -0.03792523337857953, -0.09659370673587546, -0.2518857742155281, -0.15207016724239414, -0.20186950506797682, 0.03651491738157347, -0.07844340994284721, -0.16204754999062668, 0.3857454995966206, 0.20660946607201672, 0.2060114745857815, 0.00812360290515547, 0.2712277069532623, 0.0737082694695952, 0.05509351922587181, 0.008296248114978274, 0.3191346573953827, 0.13316534627228976, 0.07208377230602006, -0.2393496525924032, 0.1040726164301547, -0.03414610280344883] |
1,802.07284 | Logic Programming Applications: What Are the Abstractions and
Implementations? | This article presents an overview of applications of logic programming,
classifying them based on the abstractions and implementations of logic
languages that support the applications. The three key abstractions are join,
recursion, and constraint. Their essential implementations are for-loops, fixed
points, and backtracking, respectively. The corresponding kinds of applications
are database queries, inductive analysis, and combinatorial search,
respectively. We also discuss language extensions and programming paradigms,
summarize example application problems by application areas, and touch on
example systems that support variants of the abstractions with different
implementations.
| cs.PL cs.AI cs.DB cs.LO | this article presents an overview of applications of logic programming classifying them based on the abstractions and implementations of logic languages that support the applications the three key abstractions are join recursion and constraint their essential implementations are forloops fixed points and backtracking respectively the corresponding kinds of applications are database queries inductive analysis and combinatorial search respectively we also discuss language extensions and programming paradigms summarize example application problems by application areas and touch on example systems that support variants of the abstractions with different implementations | [['this', 'article', 'presents', 'an', 'overview', 'of', 'applications', 'of', 'logic', 'programming', 'classifying', 'them', 'based', 'on', 'the', 'abstractions', 'and', 'implementations', 'of', 'logic', 'languages', 'that', 'support', 'the', 'applications', 'the', 'three', 'key', 'abstractions', 'are', 'join', 'recursion', 'and', 'constraint', 'their', 'essential', 'implementations', 'are', 'forloops', 'fixed', 'points', 'and', 'backtracking', 'respectively', 'the', 'corresponding', 'kinds', 'of', 'applications', 'are', 'database', 'queries', 'inductive', 'analysis', 'and', 'combinatorial', 'search', 'respectively', 'we', 'also', 'discuss', 'language', 'extensions', 'and', 'programming', 'paradigms', 'summarize', 'example', 'application', 'problems', 'by', 'application', 'areas', 'and', 'touch', 'on', 'example', 'systems', 'that', 'support', 'variants', 'of', 'the', 'abstractions', 'with', 'different', 'implementations']] | [-0.13375060602851296, -0.02094458394677876, -0.02159945741724009, 0.10298321558157218, -0.1562086156617593, -0.16403761856129456, 0.0717316227690745, 0.39667763509627046, -0.2861699145073178, -0.33422602359847775, 0.19819373628873935, -0.2773067631662406, -0.1832320067828157, 0.2593601557142476, -0.09279800812317722, 0.058324130203831814, 0.07260578857793676, -0.007152611357641631, -0.08525166329825712, -0.24434987341064487, 0.31247736410848026, -0.050754048743809774, 0.2661824890936928, 0.04550819730536006, 0.05456990582183346, 0.01838126019092983, -0.039302329639850676, 0.01725583909421988, -0.11389437001603307, 0.20113637092277065, 0.3654820455302452, 0.2582868275168384, 0.2798023236722782, -0.4442549876269253, -0.10343197608050815, 0.030789467104678524, 0.10785490755612652, 0.08917331956755156, -0.05335818310054126, -0.28489964597740736, 0.07518422896385021, -0.15959749441465426, -0.022332385540993392, -0.1553410323465179, 0.04067436345697691, 0.07836327008132277, -0.17714789158520128, -0.10955419601509936, 0.12228264792784835, 0.12681278530989998, -0.05302822896568426, -0.1763058217327999, 0.058184670155932164, 0.0863249571619277, 0.000952418936395097, -0.049226505740749084, 0.17146312624708504, -0.0773272346089669, -0.31274720061979866, 0.36751071749062375, 0.04250833282953706, -0.17328190880468994, 0.2763065536929316, 0.04492534305124233, -0.22136488063903204, 0.008428975029837811, 0.20238973486140885, 0.09979662560889947, -0.1423512745231133, 0.15809726441712602, 0.026253718904208863, 0.15749364088278736, 0.10503558954290895, 0.07941967352753741, 0.23482204284840102, 0.21126891107394777, 0.04045823122770793, 0.15130025617264467, 0.03219087267443056, -0.11043475305490282, -0.3222929838102782, -0.17829666558075055, -0.08567076296299353, -0.10541222401728703, -0.10165467463204926, -0.15981091584624915, 0.40139890483569823, 0.230515382145585, 0.11591483379751658, 0.12635104722964266, 0.36323592456421633, 0.07398445857688785, 0.07739550736197538, 0.11545632321965592, 0.0518492077873356, 0.10334036956091636, 0.12875836671212282, -0.12062593334857588, 0.062226437348016035, 0.06812208900014045] |
1,802.07285 | Developing a system for securely time-stamping and visualizing the
changes made to online news content | Nowadays, the Internet is indispensable when it comes to information
dissemination. People rely on the Internet to inform themselves on current news
events, as well as to verify facts. We, as a community, are quickly approaching
an 'electronic information age' where the majority of information will be
distributed electronically and tools to preserve this information will become
essential. While archiving online digital information is a good way to preserve
online information for future generations, it has many disadvantages including
the easy manipulation of archived information, e.g. by the archiving authority.
Online information is also prone to getting hacked or being taken offline.
Therefore, it is necessary that archived online news information is securely
time-stamped with the date and time when it was first archived in a way that
cannot be manipulated. The process of 'trusted timestamping' is an established
approach for claiming that particular digital information existed at a
particular 'point in time' in the past. However, traditional approaches for
trusted timestamping depend on the time-stamping authority's fidelity. Directly
embedding the hash of a digital file into the blockchain of a cryptocurrency is
a more recent method that allows for secure time-stamping, since digital
information is stored as part of the transaction information in, e.g.
Bitcoin's, blockchain, and not stored at a centralized time-stamping authority.
However, there is no system yet available, which uses this approach for
archiving and time-stamping online news articles. Therefore, the aim of this
thesis is to develop a system that 1) enables decentralized trusted
time-stamping of web and news articles as a means of making future manipulation
of online information identifiable, and 2) allows users to determine the
authenticity of articles by checking different versions of the same article
online.
| cs.DL cs.CY | nowadays the internet is indispensable when it comes to information dissemination people rely on the internet to inform themselves on current news events as well as to verify facts we as a community are quickly approaching an electronic information age where the majority of information will be distributed electronically and tools to preserve this information will become essential while archiving online digital information is a good way to preserve online information for future generations it has many disadvantages including the easy manipulation of archived information eg by the archiving authority online information is also prone to getting hacked or being taken offline therefore it is necessary that archived online news information is securely timestamped with the date and time when it was first archived in a way that cannot be manipulated the process of trusted timestamping is an established approach for claiming that particular digital information existed at a particular point in time in the past however traditional approaches for trusted timestamping depend on the timestamping authoritys fidelity directly embedding the hash of a digital file into the blockchain of a cryptocurrency is a more recent method that allows for secure timestamping since digital information is stored as part of the transaction information in eg bitcoins blockchain and not stored at a centralized timestamping authority however there is no system yet available which uses this approach for archiving and timestamping online news articles therefore the aim of this thesis is to develop a system that 1 enables decentralized trusted timestamping of web and news articles as a means of making future manipulation of online information identifiable and 2 allows users to determine the authenticity of articles by checking different versions of the same article online | [['nowadays', 'the', 'internet', 'is', 'indispensable', 'when', 'it', 'comes', 'to', 'information', 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1,802.07286 | Performance analysis of hybrid FSO/RF communication systems with
Alamouti Coding or Antenna Selection | In this work a novel dual-hop relay-assisted hybrid Free Space Optical /
Radio Frequency (FSO / RF) communication system is presented. In this system,
RF signal is transmitted from two antennas, and then forwarded by a single
antenna relay through FSO channel. This is the first time that performance of
using Alamouti Coding (AC) or Antenna Selection (AS) at the transmitter of a
hybrid FSO / RF system is investigated. FSO link has Gamma-Gamma atmospheric
turbulence, and in order to get closer to the actual results, the effect of
pointing error is also considered. For the first time closed-form expressions
are derived for Bit Error Rate (BER) and Outage Probability of the proposed
system and validated through MATLAB simulations. Results indicate that in this
structure, there is slight performance difference between AC and AS schemes.
Hence due to more complexity, power consumption and latency of AC, AS is
recommended. Dual-hop, hybrid FSO / RF system significantly improves
performance and reliability of the system, and is particularly suitable for
long-range applications that direct RF communication between source and
destination is not possible. Considering these advantages this structure is
particularly suitable for mobile communications which has power and processing
limitations.
| eess.SP | in this work a novel dualhop relayassisted hybrid free space optical radio frequency fso rf communication system is presented in this system rf signal is transmitted from two antennas and then forwarded by a single antenna relay through fso channel this is the first time that performance of using alamouti coding ac or antenna selection as at the transmitter of a hybrid fso rf system is investigated fso link has gammagamma atmospheric turbulence and in order to get closer to the actual results the effect of pointing error is also considered for the first time closedform expressions are derived for bit error rate ber and outage probability of the proposed system and validated through matlab simulations results indicate that in this structure there is slight performance difference between ac and as schemes hence due to more complexity power consumption and latency of ac as is recommended dualhop hybrid fso rf system significantly improves performance and reliability of the system and is particularly suitable for longrange applications that direct rf communication between source and destination is not possible considering these advantages this structure is particularly suitable for mobile communications which has power and processing limitations | [['in', 'this', 'work', 'a', 'novel', 'dualhop', 'relayassisted', 'hybrid', 'free', 'space', 'optical', 'radio', 'frequency', 'fso', 'rf', 'communication', 'system', 'is', 'presented', 'in', 'this', 'system', 'rf', 'signal', 'is', 'transmitted', 'from', 'two', 'antennas', 'and', 'then', 'forwarded', 'by', 'a', 'single', 'antenna', 'relay', 'through', 'fso', 'channel', 'this', 'is', 'the', 'first', 'time', 'that', 'performance', 'of', 'using', 'alamouti', 'coding', 'ac', 'or', 'antenna', 'selection', 'as', 'at', 'the', 'transmitter', 'of', 'a', 'hybrid', 'fso', 'rf', 'system', 'is', 'investigated', 'fso', 'link', 'has', 'gammagamma', 'atmospheric', 'turbulence', 'and', 'in', 'order', 'to', 'get', 'closer', 'to', 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1,802.07287 | {sigma, tau}-Rota-Baxter operators, infinitesimal Hom-bialgebras and the
associative (Bi)Hom-Yang-Baxter equation | We introduce the concept of {sigma, tau}-Rota-Baxter operator, as a twisted
version of a Rota-Baxter operator of weight zero. We show how to obtain a
certain {sigma, tau}-Rota-Baxter operator from a solution of the associative
(Bi)Hom-Yang-Baxter equation, and, in a compatible way, a Hom-pre-Lie algebra
from an infinitesimal Hom-bialgebra.
| math.QA | we introduce the concept of sigma taurotabaxter operator as a twisted version of a rotabaxter operator of weight zero we show how to obtain a certain sigma taurotabaxter operator from a solution of the associative bihomyangbaxter equation and in a compatible way a homprelie algebra from an infinitesimal hombialgebra | [['we', 'introduce', 'the', 'concept', 'of', 'sigma', 'taurotabaxter', 'operator', 'as', 'a', 'twisted', 'version', 'of', 'a', 'rotabaxter', 'operator', 'of', 'weight', 'zero', 'we', 'show', 'how', 'to', 'obtain', 'a', 'certain', 'sigma', 'taurotabaxter', 'operator', 'from', 'a', 'solution', 'of', 'the', 'associative', 'bihomyangbaxter', 'equation', 'and', 'in', 'a', 'compatible', 'way', 'a', 'homprelie', 'algebra', 'from', 'an', 'infinitesimal', 'hombialgebra']] | [-0.13518322296440602, 0.07445556394425996, -0.1383155850486623, 0.06579343502720197, -0.12441905558937126, -0.12209414299577474, 0.028144571392072572, 0.32565840813848707, -0.38643975406885145, -0.15894925110042096, 0.1137782178275908, -0.26708892757693925, -0.21010194685724046, 0.15439057480543852, -0.10755304656922818, -0.005613279032210509, 0.09618215678880612, 0.1633825197401974, -0.1430381144500441, -0.11295923741223911, 0.43817478641867635, 0.02924562773356835, 0.1807067956775427, 0.01468355196217696, 0.19491816469364695, -0.021565400953922006, 0.00983291394594643, 0.011576735807789697, -0.14811050279272928, 0.1503287727634112, 0.21287495502167278, 0.06436158625615968, 0.25376243963837625, -0.37130281180143354, -0.09299637300686704, 0.12046790046410429, 0.11742690828525358, 0.07118773168056375, -0.04362562681651778, -0.2509846185851428, 0.09943846546941333, -0.2902280843092336, -0.17597444380840493, -0.04004786184523255, 0.010493222499887149, -0.029744019193781748, -0.299188229524427, 0.05374242847578393, 0.09414407037612464, 0.08517128593391843, -0.12918832604255942, -0.07970127280180653, -0.06325181631578339, 0.031556875031027526, -0.08262530465920766, 0.04287007295837005, 0.08731760297798448, -0.11826789053674373, -0.14850258090041785, 0.3402331775882178, -0.1375891741986076, -0.28967838543984625, 0.03720789663493633, -0.13302347970376205, -0.11712574896713097, 0.014973102716936006, 0.08947725547477603, 0.12547722395134364, -0.1196482781941692, 0.18587241909440813, -0.12380271903756591, 0.12345091621908877, 0.044300588344534236, 0.009234455186459753, 0.13586705705771843, 0.12299221350500981, 0.13672352102067736, 0.20182763921717803, 0.05015778274585803, -0.025586184362570444, -0.39360953287945855, -0.21584852478570407, -0.08549752702626089, 0.19149839118536977, -0.08367297271648164, -0.22737682623167832, 0.43742166757583617, 0.14812575214697668, 0.2769774677438868, 0.10177251431677077, 0.1827234780622853, 0.17776738912022363, 0.1303109907441669, 0.04580949751867188, 0.08566114987350172, 0.24329971198716926, 0.09742843816056848, -0.15655784061592487, -0.09522811393964932, 0.18308378017197052] |
1,802.07288 | A note on a problem invoving a square in a curvilinear triangle | A problem involving a square in the curvilinear triangle made by two touching
congruent circles and their common tangent is generalized.
| math.HO | a problem involving a square in the curvilinear triangle made by two touching congruent circles and their common tangent is generalized | [['a', 'problem', 'involving', 'a', 'square', 'in', 'the', 'curvilinear', 'triangle', 'made', 'by', 'two', 'touching', 'congruent', 'circles', 'and', 'their', 'common', 'tangent', 'is', 'generalized']] | [-0.2161387892528659, 0.07456154482705253, -0.002340321162981646, 0.056214492950987606, -0.11477172179591089, -0.19495892981510787, 0.0199886682842459, 0.3679551091932115, -0.3422004811110951, -0.21102077584891094, 0.13034356804010236, -0.3866540124817264, -0.190588880064232, 0.1220107227563858, -0.09346481625522886, 0.11395360853168227, 0.02739305882936432, 0.07333042463731199, -0.09222678050753616, -0.2531745094096377, 0.34680440911047516, -0.08416888750313471, 0.19569976769742511, 0.029555124286118718, 0.09716800032627015, 0.06798443129463565, -0.023441998376732782, 0.13787801421823956, -0.10693100905267611, 0.20244771472200573, 0.20452392722169557, 0.043427232475507824, 0.29710754840856507, -0.45473170040973593, -0.07396604311430738, 0.13818570142168374, 0.1453743755285229, -0.07438462433804359, 0.01763459698607524, -0.23981235894773686, -0.03196815720626286, -0.015466122400192987, -0.23233194811092245, 0.03128397837281227, -0.020819749328352156, 0.03349143053804125, -0.16480318244014466, 0.05746737969595762, 0.11038552679210192, 0.14711359258563744, 0.009627957074415116, -0.16997153825303984, 0.012782814158570199, 0.05616145852088396, -0.005519360359314652, 0.032798551045180785, 0.024014511722184363, -0.014481258711644582, -0.1395521480590105, 0.503144465741657, 0.07086665821926934, -0.34968160110570135, 0.0897738595626184, -0.07916174773570328, -0.05562899421368327, 0.17972945860986198, 0.10507742936412494, 0.09606338984199933, -0.1353845681906456, 0.08238190230414537, -0.1283209105243995, 0.05638895853466931, 0.2264388988592795, -0.1653182924325977, 0.297193925916439, 0.0684232201338524, 0.0974370286844316, 0.19519108975128757, -0.09317248030787423, -0.12153489887714386, -0.295202915246288, -0.19846059315438783, -0.2322721742093563, -0.007561213602977139, -0.12504100548921132, -0.2424140584965547, 0.3717249045591979, -0.047548571335417886, 0.22459849001218876, -0.001752341166138649, 0.24884456786371412, 0.0030436042164053234, 0.08382104806202863, 0.04530239120746652, 0.21999976446940786, 0.10837560139286022, -0.03684404093239989, -0.09019513731999766, -0.07658500579141435, 0.15181418224459603] |
1,802.07289 | Quasilinear Schr\"odinger-Poisson system under an exponential critical
nonlinearity: existence and asymptotic of solutions | In this paper we consider the following quasilinear Schr\"odinger-Poisson
system in a bounded domain in $\mathbb{R}^{2}$: $$ \left\{ \begin{array}[c]{ll}
- \Delta u +\phi u = f(u) &\ \mbox{in } \Omega, -\Delta \phi -
\varepsilon^{4}\Delta_4 \phi = u^{2} & \ \mbox{in } \Omega, u=\phi=0 & \
\mbox{on } \partial\Omega \end{array}
\right. $$ depending on the parameter $\varepsilon>0$. The nonlinearity $f$
is assumed to have critical exponencial growth. We first prove existence of
nontrivial solutions $(u_{\varepsilon}, \phi_{\varepsilon})$ and then we show
that as $\varepsilon\to0^{+}$ these solutions converges to a nontrivial
solution of the associated Schr\"odinger-Poisson system, that is by making
$\varepsilon=0$ in the system above.
| math.AP | in this paper we consider the following quasilinear schrodingerpoisson system in a bounded domain in mathbbr2 left beginarraycll delta u phi u fu mboxin omega delta phi varepsilon4delta_4 phi u2 mboxin omega uphi0 mboxon partialomega endarray right depending on the parameter varepsilon0 the nonlinearity f is assumed to have critical exponencial growth we first prove existence of nontrivial solutions u_varepsilon phi_varepsilon and then we show that as varepsilonto0 these solutions converges to a nontrivial solution of the associated schrodingerpoisson system that is by making varepsilon0 in the system above | [['in', 'this', 'paper', 'we', 'consider', 'the', 'following', 'quasilinear', 'schrodingerpoisson', 'system', 'in', 'a', 'bounded', 'domain', 'in', 'mathbbr2', 'left', 'beginarraycll', 'delta', 'u', 'phi', 'u', 'fu', 'mboxin', 'omega', 'delta', 'phi', 'varepsilon4delta_4', 'phi', 'u2', 'mboxin', 'omega', 'uphi0', 'mboxon', 'partialomega', 'endarray', 'right', 'depending', 'on', 'the', 'parameter', 'varepsilon0', 'the', 'nonlinearity', 'f', 'is', 'assumed', 'to', 'have', 'critical', 'exponencial', 'growth', 'we', 'first', 'prove', 'existence', 'of', 'nontrivial', 'solutions', 'u_varepsilon', 'phi_varepsilon', 'and', 'then', 'we', 'show', 'that', 'as', 'varepsilonto0', 'these', 'solutions', 'converges', 'to', 'a', 'nontrivial', 'solution', 'of', 'the', 'associated', 'schrodingerpoisson', 'system', 'that', 'is', 'by', 'making', 'varepsilon0', 'in', 'the', 'system', 'above']] | [-0.28908800862209744, 0.05588785676437235, 0.004380291571494105, -0.03844583808677271, -0.08710584595669495, -0.20803801325518032, -0.015233894234772252, 0.30979558536891155, -0.34235521986387496, -0.1311721280325464, 0.12057860630975906, -0.42722923668144747, -0.09800065809665898, 0.14267502178513813, -0.07343105208345277, 0.0948610388576378, 0.0039038446212057458, 0.07925944386840646, -0.03565219400970395, -0.13567582276638943, 0.37192150255188694, -0.2498522993978546, 0.10256601586331461, 0.08354346759530694, 0.08167975892442776, -0.11084498085222359, 0.16578852206598535, -0.05789239121449375, -0.346284848037697, -0.04377580639841252, 0.1799054918215112, 0.05198293142724609, 0.38037140918679013, -0.3788477119361592, -0.14285031752931604, 0.19634953713001208, 0.21035770084275757, -0.09484943588329263, -0.004560429992717366, -0.36558312454888986, 0.15936981305902348, -0.0840507872662572, -0.185715431320416, -0.025702823440782552, 0.13277001709265765, 0.08101325833880299, -0.37129506523461014, 0.14596341725785372, 0.09550212569762194, -0.06069770879870237, -0.12878601837816628, -0.13677010680467627, -0.041537777314958876, 0.0028871788892375176, 0.03596908066199746, 0.2103671658524247, 0.004783970780324104, -0.12989871488440088, 0.05389505678376313, 0.3657744243134593, -0.13846594961847417, -0.3076075533794802, 0.055367919248203896, -0.2425173810888948, -0.14208726780380793, 0.0327985011566387, 0.12454634064234534, 0.18276872325601967, -0.10140110606812942, 0.321905671390786, -0.0836441976797962, 0.23481929606519814, 0.1412145759975321, -0.046721734604689966, -0.004708335374828515, 0.15969425311236274, 0.19193237553131334, 0.08311002155722574, 0.003836274685116138, -0.01256950912715564, -0.39698345664628715, -0.10661353441063574, -0.1176140470170351, 0.17191248957008842, -0.06223250775537752, -0.1799250935031058, 0.2950651258511772, 0.09989006979780835, 0.19038128106703245, 0.04396956445389362, 0.16792245915289536, 0.20214812026418702, -0.09398303402392844, 0.10885204179320744, 0.12394193616739019, 0.06927983044798292, 0.165776995059406, -0.29248025104251885, -0.019278951216662347, 0.11407856877705727] |
1,802.0729 | Growth of the analytic rank of modular elliptic curves over quintic
extensions | Given $F$ a totally real field and $E_{/F}$ a modular elliptic curve, we
denote by $G_5(E_{/F};X)$ the number of quintic extensions $K$ of $F$ such that
the norm of the relative discriminant is at most $X$ and the analytic rank of
$E$ grows over $K$, i.e., $r_\mathrm{an}(E/K)>r_\mathrm{an}(E/F)$. We show that
$G_5(E_{/F};X)\asymp_{+\infty} X$ when the elliptic curve $E_{/F}$ has odd
conductor and at least one prime of multiplicative reduction. As Bhargava,
Shankar and Wang \cite{BSW} showed that the number of quintic extensions of $F$
with norm of the relative discriminant at most $X$ is asymptotic to $c_{5,F} X$
for some positive constant $c_{5,F}$, our result exposes the growth of the
analytic rank as a very common circumstance over quintic extensions.
| math.NT | given f a totally real field and e_f a modular elliptic curve we denote by g_5e_fx the number of quintic extensions k of f such that the norm of the relative discriminant is at most x and the analytic rank of e grows over k ie r_mathrmanekr_mathrmanef we show that g_5e_fxasymp_infty x when the elliptic curve e_f has odd conductor and at least one prime of multiplicative reduction as bhargava shankar and wang citebsw showed that the number of quintic extensions of f with norm of the relative discriminant at most x is asymptotic to c_5f x for some positive constant c_5f our result exposes the growth of the analytic rank as a very common circumstance over quintic extensions | [['given', 'f', 'a', 'totally', 'real', 'field', 'and', 'e_f', 'a', 'modular', 'elliptic', 'curve', 'we', 'denote', 'by', 'g_5e_fx', 'the', 'number', 'of', 'quintic', 'extensions', 'k', 'of', 'f', 'such', 'that', 'the', 'norm', 'of', 'the', 'relative', 'discriminant', 'is', 'at', 'most', 'x', 'and', 'the', 'analytic', 'rank', 'of', 'e', 'grows', 'over', 'k', 'ie', 'r_mathrmanekr_mathrmanef', 'we', 'show', 'that', 'g_5e_fxasymp_infty', 'x', 'when', 'the', 'elliptic', 'curve', 'e_f', 'has', 'odd', 'conductor', 'and', 'at', 'least', 'one', 'prime', 'of', 'multiplicative', 'reduction', 'as', 'bhargava', 'shankar', 'and', 'wang', 'citebsw', 'showed', 'that', 'the', 'number', 'of', 'quintic', 'extensions', 'of', 'f', 'with', 'norm', 'of', 'the', 'relative', 'discriminant', 'at', 'most', 'x', 'is', 'asymptotic', 'to', 'c_5f', 'x', 'for', 'some', 'positive', 'constant', 'c_5f', 'our', 'result', 'exposes', 'the', 'growth', 'of', 'the', 'analytic', 'rank', 'as', 'a', 'very', 'common', 'circumstance', 'over', 'quintic', 'extensions']] | [-0.21972929890545315, 0.04611989566974603, -0.09130786564007091, 0.017101104822614344, -0.05281973300142247, -0.182871763198228, 0.017631964676343558, 0.27984639223289204, -0.3072569634573403, -0.23732672576187996, 0.054201728762372545, -0.3372517435386646, -0.12859591398910994, 0.24553839232478486, -0.0681183263363333, 0.00665125833709904, -0.026692894075000494, 0.1485989171554122, -0.0931170296430457, -0.36865572626457405, 0.34878774728266554, -0.037238923546841794, 0.14575391031572954, 0.05178827462154195, 0.08465622784161385, 0.02458561367453321, 0.03804744734722925, -0.009404631623622487, -0.10989892570062677, 0.13258670361532846, 0.30726766489903656, 0.06354146697476767, 0.2642644925304411, -0.30950641625544484, -0.1950917645815041, 0.20077023712362638, 0.09622651738882587, -0.03686755586807665, 0.006509270949959101, -0.16668238784921796, 0.16427468143305496, -0.1350580991752315, -0.17634654647196857, -0.0695402202555877, 0.10444007933409394, 0.04522914983783522, -0.2860770670844144, 0.030289477680956845, 0.10789734605567534, 0.15014368071212647, -0.030591837575724513, -0.1931278275268708, -0.07916787815108699, -0.028475955296910303, 0.072690321030422, 0.1112155256897064, 0.05423785518168619, -0.11828144015989413, -0.04071660630666373, 0.3366839492294259, -0.10938098887390081, -0.1556412690827672, 0.11743234589761287, -0.19780008831845694, -0.08712137387983762, 0.15408413574557034, 0.12486314953288488, 0.131974371906325, 0.03412799057670718, 0.21730234800519324, -0.09868120710266419, 0.1352806826726648, 0.13217303896192134, -0.038961952523606125, 0.11252588515880664, 0.08119466225412396, 0.103091327444928, 0.10314647072370638, -0.04564336149773577, 0.015481181238500173, -0.372364942049771, -0.1727046333212536, -0.17794197707910808, 0.13792638598304047, -0.1331277501502834, -0.13628145305668576, 0.40529795587389617, 0.031341094045752756, 0.24009239499195756, 0.09397069583728648, 0.22053651841308333, 0.09557555477326866, 0.022039490035048834, 0.08573092327487916, 0.09716802328674883, 0.19253626791147613, -0.020958175435417184, -0.1984307503474778, 0.03130798869798973, 0.10000314844543473] |
1,802.07291 | On spin distributions for generic p-spin models | We provide an alternative formula for spin distributions of generic p-spin
glass models. As a main application of this expression, we write spin
statistics as solutions of partial differential equations and we show that the
generic p-spin models satisfy multiscale Thouless-Anderson-Palmer equations as
originally predicted in the work of Mezard-Virasoro.
| math.PR math-ph math.MP | we provide an alternative formula for spin distributions of generic pspin glass models as a main application of this expression we write spin statistics as solutions of partial differential equations and we show that the generic pspin models satisfy multiscale thoulessandersonpalmer equations as originally predicted in the work of mezardvirasoro | [['we', 'provide', 'an', 'alternative', 'formula', 'for', 'spin', 'distributions', 'of', 'generic', 'pspin', 'glass', 'models', 'as', 'a', 'main', 'application', 'of', 'this', 'expression', 'we', 'write', 'spin', 'statistics', 'as', 'solutions', 'of', 'partial', 'differential', 'equations', 'and', 'we', 'show', 'that', 'the', 'generic', 'pspin', 'models', 'satisfy', 'multiscale', 'thoulessandersonpalmer', 'equations', 'as', 'originally', 'predicted', 'in', 'the', 'work', 'of', 'mezardvirasoro']] | [-0.08330544159386535, 0.07782805434752456, -0.12590413737319867, 0.12944744336086192, -0.06276850269309112, -0.13793763103039594, -0.05466226030293168, 0.27064021593862575, -0.2154336742657636, -0.29056926693159096, 0.09304444349076295, -0.23942988324074113, -0.21307932764139711, 0.172476424531517, -0.01682664256314842, 0.08579174915746766, -0.00937573237781774, -0.0008247693072842928, -0.12887149386355007, -0.19380400455271712, 0.32702282371892766, -0.04472062330008769, 0.2732186561868507, 0.030264069193175862, 0.19627790046589716, 0.051943504099487045, 0.06305897319499328, -0.005210870475394233, -0.20878821556834737, 0.09013865291312033, 0.24526946957188073, 0.09862316532383616, 0.15409993250113058, -0.4802170619368553, -0.21960921157911725, 0.08812566155719818, 0.13696201268241417, 0.21168502659669944, -0.0294572224166976, -0.22996887127507706, 0.06987985204525139, -0.2734929128949131, -0.21012967937074753, -0.1548059830936242, -0.01079869004232543, 0.07251614974621608, -0.2922884399375441, 0.11428211690211783, 0.15966895067760226, 0.07478256194320108, -0.13956698625139435, -0.14006593163904488, -0.01377964149020156, 0.060860507104697883, 0.042204133738592574, -0.03742386718109554, 0.0390608421222744, -0.1471708854993007, -0.16261282403554236, 0.34149470225888856, -0.12414739145992362, -0.2667074163957518, 0.139277045405945, -0.07130786432523509, -0.1779338444716164, 0.03925496645803962, 0.1613193992620372, 0.18635244336815512, -0.1854850202988909, 0.0876971261601952, -0.05797475336917809, 0.11071019753699704, 0.028089410834470575, -0.012044962695134538, 0.1761570704806292, 0.15916158760688742, 0.053906441324067356, 0.17767798872094373, -0.059137266243294795, -0.15227366565745704, -0.3065799075007743, -0.21644391284837405, -0.19000329081520287, 0.10526923485556428, -0.10831361322702926, -0.18922649361953445, 0.38353183827534015, 0.19750719441918238, 0.16427127522777538, 0.1294451705845339, 0.22991513711761455, 0.19722870068044915, 0.006147603285784016, 0.023742537394318045, 0.12730607675502495, 0.20801297658864332, 0.0964633535821827, -0.1744624632410705, 0.032219575661025485, 0.11099699067370015] |
1,802.07292 | Bots increase exposure to negative and inflammatory content in online
social systems | Societies are complex systems which tend to polarize into sub-groups of
individuals with dramatically opposite perspectives. This phenomenon is
reflected -- and often amplified -- in online social networks where, however,
humans are no more the only players, and co-exist alongside with social bots,
i.e., software-controlled accounts. Analyzing large-scale social data collected
during the Catalan referendum for independence on October 1, 2017, consisting
of nearly 4 millions Twitter posts generated by almost 1 million users, we
identify the two polarized groups of Independentists and Constitutionalists and
quantify the structural and emotional roles played by social bots. We show that
bots act from peripheral areas of the social system to target influential
humans of both groups, bombarding Independentists with violent contents,
increasing their exposure to negative and inflammatory narratives and
exacerbating social conflict online. Our findings stress the importance of
developing countermeasures to unmask these forms of automated social
manipulation.
| physics.soc-ph cs.CY cs.HC cs.MA cs.SI | societies are complex systems which tend to polarize into subgroups of individuals with dramatically opposite perspectives this phenomenon is reflected and often amplified in online social networks where however humans are no more the only players and coexist alongside with social bots ie softwarecontrolled accounts analyzing largescale social data collected during the catalan referendum for independence on october 1 2017 consisting of nearly 4 millions twitter posts generated by almost 1 million users we identify the two polarized groups of independentists and constitutionalists and quantify the structural and emotional roles played by social bots we show that bots act from peripheral areas of the social system to target influential humans of both groups bombarding independentists with violent contents increasing their exposure to negative and inflammatory narratives and exacerbating social conflict online our findings stress the importance of developing countermeasures to unmask these forms of automated social manipulation | [['societies', 'are', 'complex', 'systems', 'which', 'tend', 'to', 'polarize', 'into', 'subgroups', 'of', 'individuals', 'with', 'dramatically', 'opposite', 'perspectives', 'this', 'phenomenon', 'is', 'reflected', 'and', 'often', 'amplified', 'in', 'online', 'social', 'networks', 'where', 'however', 'humans', 'are', 'no', 'more', 'the', 'only', 'players', 'and', 'coexist', 'alongside', 'with', 'social', 'bots', 'ie', 'softwarecontrolled', 'accounts', 'analyzing', 'largescale', 'social', 'data', 'collected', 'during', 'the', 'catalan', 'referendum', 'for', 'independence', 'on', 'october', '1', '2017', 'consisting', 'of', 'nearly', '4', 'millions', 'twitter', 'posts', 'generated', 'by', 'almost', '1', 'million', 'users', 'we', 'identify', 'the', 'two', 'polarized', 'groups', 'of', 'independentists', 'and', 'constitutionalists', 'and', 'quantify', 'the', 'structural', 'and', 'emotional', 'roles', 'played', 'by', 'social', 'bots', 'we', 'show', 'that', 'bots', 'act', 'from', 'peripheral', 'areas', 'of', 'the', 'social', 'system', 'to', 'target', 'influential', 'humans', 'of', 'both', 'groups', 'bombarding', 'independentists', 'with', 'violent', 'contents', 'increasing', 'their', 'exposure', 'to', 'negative', 'and', 'inflammatory', 'narratives', 'and', 'exacerbating', 'social', 'conflict', 'online', 'our', 'findings', 'stress', 'the', 'importance', 'of', 'developing', 'countermeasures', 'to', 'unmask', 'these', 'forms', 'of', 'automated', 'social', 'manipulation']] | [-0.12452442510160229, 0.16697160178672574, -0.03859382138277093, 0.11007194071620081, -0.12389302670150452, -0.1464186157314139, 0.07077816556678347, 0.42978697042498326, -0.2283560147172668, -0.37130251257137087, 0.040399749862748045, -0.4044242524675307, -0.22657720897890007, 0.15257119977387548, -0.06408134836803786, -0.07279051727123766, 0.05639386858739373, 0.04787647464319081, 0.10575494877411984, -0.3409822669475236, 0.33036711940399577, 0.023906756827273057, 0.3116968594379917, 0.045427197593704075, 0.06376641524143957, 0.015853482979259245, -0.1113412137880611, 0.018274141611376155, -0.04710917486353436, 0.17362377092811382, 0.3887338623042322, 0.18586149693308268, 0.3843445168135481, -0.46855258057864074, -0.1645600469976974, 0.12001425648729007, 0.12966424186985628, 0.06641547646641913, -0.028679529353414383, -0.39080128284533405, 0.07126392579973778, -0.17913763491216944, -0.06242099489059506, -0.04717789551634471, 0.041321440215041444, 0.032147662034630126, -0.1927246313749088, 0.06309831811631739, 0.02341881322596843, 0.17248504423575164, -0.042300278118798613, -0.09907004531042832, -0.05024374171383291, 0.25797325963827056, 0.12235581169483743, -0.05546912029320891, 0.22306021364299036, -0.18022597190995132, -0.17231735647591348, 0.37104211031045353, 0.04221865316988745, -0.07121469097940765, 0.21724998590070754, -0.09210624587204722, -0.134650675707639, 0.09531652814621339, 0.2776915686521938, 0.06276432995865536, -0.15474460487166652, -0.0806739506462893, -0.03922677752820568, 0.1902470244878916, 0.13170347612079544, -0.027285809517100763, 0.1720537933223467, 0.16219464344774476, 0.051019680249737576, 0.044946102528936334, 0.018854493289836682, -0.09360613604399583, -0.15807494490743718, -0.10269288562408797, -0.08785695572926973, 0.05690975905680615, -0.10806703514723874, -0.10519177864302441, 0.3605072957369784, 0.127337769475869, 0.13926781125418428, 0.019857332968159527, 0.23032237837631125, -0.0529955146703287, 0.07655311557674496, 0.0957514506266711, 0.15588935607876112, 0.021466197731923684, 0.18605788708939347, -0.16023880910102484, 0.15346279563770318, -0.0476619709087471] |
1,802.07293 | Remarks on cosmological gravitational waves | We study the propagation of a gravitational wave in an Ads spacetime. We find
that, in presence of the cosmological constant, the graviton mass cannot be
measured with higher precision than the square root of the cosmological
constant.
| gr-qc | we study the propagation of a gravitational wave in an ads spacetime we find that in presence of the cosmological constant the graviton mass cannot be measured with higher precision than the square root of the cosmological constant | [['we', 'study', 'the', 'propagation', 'of', 'a', 'gravitational', 'wave', 'in', 'an', 'ads', 'spacetime', 'we', 'find', 'that', 'in', 'presence', 'of', 'the', 'cosmological', 'constant', 'the', 'graviton', 'mass', 'can', 'not', 'be', 'measured', 'with', 'higher', 'precision', 'than', 'the', 'square', 'root', 'of', 'the', 'cosmological', 'constant']] | [-0.19032534679923302, 0.16888841665805115, -0.02855599103256678, 0.06559497533509365, -0.10224687499113572, -0.06297835281405312, -0.06189486842889052, 0.3201199916119759, -0.2004044057849126, -0.2840807748576387, 0.1030508357231529, -0.25695201592185557, -0.11696289040339299, 0.17703172201529527, 0.032665999057010196, 0.0023839956818100735, -0.0038476488672387907, 0.12053086427159798, -0.1256783504743511, -0.27440796150133395, 0.3540298728367839, 0.13806870894936416, 0.18453272317464536, 0.03729220427787648, 0.1087515765371231, -0.0233813395174459, -0.031388416862449586, 0.06321621648012063, -0.1915313064500179, 0.03303928033281595, 0.1325546530290292, 0.105240332082105, 0.23308746354320112, -0.36863356246015966, -0.23910520711722663, 0.15357648904841298, 0.17648744055380425, 0.20289415799272367, -0.03986636186257387, -0.2687585530563807, 0.08961174075897688, -0.1891986585389345, -0.17386077619038331, 0.02312469728386555, -0.04195161710660427, -0.03693178736079389, -0.20933045763283586, 0.15662563596971524, -0.041137528677399345, -0.025067496423919994, -0.0927920948761778, -0.07454200361210567, -0.03063002572609828, 0.08077767946255895, 0.12623744004238874, 0.08095684695917253, 0.11285504670097278, -0.17347344116140634, -0.11517236267144863, 0.42172196115820837, -0.20056550273595627, -0.24391727512463546, 0.09946949746555243, -0.2704055052607332, -0.07015586579934908, 0.11214140067115808, 0.20095647116884208, 0.09495500707998872, -0.12317748716435371, 0.09952267187719162, -0.012190345101258479, 0.2288545693915624, 0.13321806359080932, 0.05630283818269769, 0.2775983263213092, 0.11000002975253245, 0.06847378920214489, 0.06842948469476631, -0.09241142783027428, -0.03066942473061574, -0.36499014812020153, -0.17040143532153124, -0.18589132436766073, 0.10965079652557436, -0.22553515288596734, -0.19942627780330488, 0.3384255395294764, 0.15017369173419398, 0.15135211807986101, 0.09177210530600487, 0.2355808560282756, 0.13386735595010507, 0.08278207390163189, 0.10424909473229678, 0.3816706574498079, 0.08871931711641642, 0.08778715059638788, -0.2606739323013104, -0.03375071524761808, 0.03386502223423658] |
1,802.07294 | GASP. V. Ram-pressure stripping of a ring Hoag's-like galaxy in a
massive cluster | Through an ongoing MUSE program dedicated to study gas removal processes in
galaxies (GAs Stripping Phenomena in galaxies with MUSE, GASP), we have
obtained deep and wide integral field spectroscopy of the galaxy JO171. This
galaxy resembles the Hoag's galaxy, one of the most spectacular examples of
ring galaxies, characterized by a completely detached ring of young stars
surrounding a central old spheroid. At odds with the isolated Hoag's galaxy,
JO171 is part of a dense environment, the cluster Abell 3667, which is causing
gas stripping along tentacles. Moreover, its ring counter-rotates with respect
to the central spheroid. The joint analysis of the stellar populations and the
gas/stellar kinematics shows that the origin of the ring was not due to an
internal mechanism, but was related to a gas accretion event that happened in
the distant past, prior to accretion onto Abell 3667, most probably within a
filament. More recently, since infall in the cluster, the gas in the ring has
been stripped by ram- pressure, causing the quenching of star formation in the
stripped half of the ring. This is the first observed case of ram pressure
stripping in action in a ring galaxy, and MUSE observations are able to reveal
both of the events (accretion and stripping) that caused dramatic
transformations in this galaxy.
| astro-ph.GA | through an ongoing muse program dedicated to study gas removal processes in galaxies gas stripping phenomena in galaxies with muse gasp we have obtained deep and wide integral field spectroscopy of the galaxy jo171 this galaxy resembles the hoags galaxy one of the most spectacular examples of ring galaxies characterized by a completely detached ring of young stars surrounding a central old spheroid at odds with the isolated hoags galaxy jo171 is part of a dense environment the cluster abell 3667 which is causing gas stripping along tentacles moreover its ring counterrotates with respect to the central spheroid the joint analysis of the stellar populations and the gasstellar kinematics shows that the origin of the ring was not due to an internal mechanism but was related to a gas accretion event that happened in the distant past prior to accretion onto abell 3667 most probably within a filament more recently since infall in the cluster the gas in the ring has been stripped by ram pressure causing the quenching of star formation in the stripped half of the ring this is the first observed case of ram pressure stripping in action in a ring galaxy and muse observations are able to reveal both of the events accretion and stripping that caused dramatic transformations in this galaxy | [['through', 'an', 'ongoing', 'muse', 'program', 'dedicated', 'to', 'study', 'gas', 'removal', 'processes', 'in', 'galaxies', 'gas', 'stripping', 'phenomena', 'in', 'galaxies', 'with', 'muse', 'gasp', 'we', 'have', 'obtained', 'deep', 'and', 'wide', 'integral', 'field', 'spectroscopy', 'of', 'the', 'galaxy', 'jo171', 'this', 'galaxy', 'resembles', 'the', 'hoags', 'galaxy', 'one', 'of', 'the', 'most', 'spectacular', 'examples', 'of', 'ring', 'galaxies', 'characterized', 'by', 'a', 'completely', 'detached', 'ring', 'of', 'young', 'stars', 'surrounding', 'a', 'central', 'old', 'spheroid', 'at', 'odds', 'with', 'the', 'isolated', 'hoags', 'galaxy', 'jo171', 'is', 'part', 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1,802.07295 | Attack Strength vs. Detectability Dilemma in Adversarial Machine
Learning | As the prevalence and everyday use of machine learning algorithms, along with
our reliance on these algorithms grow dramatically, so do the efforts to attack
and undermine these algorithms with malicious intent, resulting in a growing
interest in adversarial machine learning. A number of approaches have been
developed that can render a machine learning algorithm ineffective through
poisoning or other types of attacks. Most attack algorithms typically use
sophisticated optimization approaches, whose objective function is designed to
cause maximum damage with respect to accuracy and performance of the algorithm
with respect to some task. In this effort, we show that while such an objective
function is indeed brutally effective in causing maximum damage on an embedded
feature selection task, it often results in an attack mechanism that can be
easily detected with an embarrassingly simple novelty or outlier detection
algorithm. We then propose an equally simple yet elegant solution by adding a
regularization term to the attacker's objective function that penalizes
outlying attack points.
| stat.ML cs.LG | as the prevalence and everyday use of machine learning algorithms along with our reliance on these algorithms grow dramatically so do the efforts to attack and undermine these algorithms with malicious intent resulting in a growing interest in adversarial machine learning a number of approaches have been developed that can render a machine learning algorithm ineffective through poisoning or other types of attacks most attack algorithms typically use sophisticated optimization approaches whose objective function is designed to cause maximum damage with respect to accuracy and performance of the algorithm with respect to some task in this effort we show that while such an objective function is indeed brutally effective in causing maximum damage on an embedded feature selection task it often results in an attack mechanism that can be easily detected with an embarrassingly simple novelty or outlier detection algorithm we then propose an equally simple yet elegant solution by adding a regularization term to the attackers objective function that penalizes outlying attack points | [['as', 'the', 'prevalence', 'and', 'everyday', 'use', 'of', 'machine', 'learning', 'algorithms', 'along', 'with', 'our', 'reliance', 'on', 'these', 'algorithms', 'grow', 'dramatically', 'so', 'do', 'the', 'efforts', 'to', 'attack', 'and', 'undermine', 'these', 'algorithms', 'with', 'malicious', 'intent', 'resulting', 'in', 'a', 'growing', 'interest', 'in', 'adversarial', 'machine', 'learning', 'a', 'number', 'of', 'approaches', 'have', 'been', 'developed', 'that', 'can', 'render', 'a', 'machine', 'learning', 'algorithm', 'ineffective', 'through', 'poisoning', 'or', 'other', 'types', 'of', 'attacks', 'most', 'attack', 'algorithms', 'typically', 'use', 'sophisticated', 'optimization', 'approaches', 'whose', 'objective', 'function', 'is', 'designed', 'to', 'cause', 'maximum', 'damage', 'with', 'respect', 'to', 'accuracy', 'and', 'performance', 'of', 'the', 'algorithm', 'with', 'respect', 'to', 'some', 'task', 'in', 'this', 'effort', 'we', 'show', 'that', 'while', 'such', 'an', 'objective', 'function', 'is', 'indeed', 'brutally', 'effective', 'in', 'causing', 'maximum', 'damage', 'on', 'an', 'embedded', 'feature', 'selection', 'task', 'it', 'often', 'results', 'in', 'an', 'attack', 'mechanism', 'that', 'can', 'be', 'easily', 'detected', 'with', 'an', 'embarrassingly', 'simple', 'novelty', 'or', 'outlier', 'detection', 'algorithm', 'we', 'then', 'propose', 'an', 'equally', 'simple', 'yet', 'elegant', 'solution', 'by', 'adding', 'a', 'regularization', 'term', 'to', 'the', 'attackers', 'objective', 'function', 'that', 'penalizes', 'outlying', 'attack', 'points']] | [-0.05921521485732051, 0.013679455734080232, -0.08854485296348973, 0.06167933612099349, -0.14226502192876778, -0.21855716462951244, 0.07143236147367577, 0.4433364981212923, -0.26313265514802814, -0.3626208859304159, 0.10720754263456911, -0.2753779602786469, -0.23746412362627936, 0.1902329459503895, -0.17223630353479033, 0.11592803267114682, 0.06885553077402774, 0.04977942720231623, -0.021237550547528194, -0.3117758271329832, 0.2888119752950421, 0.05986667105292038, 0.2964284618771294, 0.03238966807768476, 0.06258127448452841, -0.0058670762909303715, 0.0005675947248208813, 0.03204639810251027, -0.044454694726460374, 0.12392120501140087, 0.3302880302980179, 0.24063212330106692, 0.39360138973953746, -0.41494202467317626, -0.1932851774021756, 0.15093781970293693, 0.17987357841935236, 0.1293284511321406, -0.06607710430540553, -0.2779819738416558, 0.10062839419615335, -0.20175626566480964, -0.06293361801114615, -0.12778637495258163, -0.03374220549821763, 0.003497733189028733, -0.25910890978340784, -0.0153881895319323, 0.0638422085917782, 0.048248131972419596, -0.01910361399016593, -0.08863875489659244, 0.036341203789783234, 0.08955256008293207, 0.11450801464791478, 0.06522864697035402, 0.17358548357435388, -0.15178840300607746, -0.17018097134522822, 0.33554355557099347, -0.03317368635907769, -0.23194400701535547, 0.2170218700981733, 0.03047052141926365, -0.1496413562549051, 0.1625007828924714, 0.24234422894262866, 0.1321455691231233, -0.1404548197382743, 0.003365568491905678, 0.03583675800118505, 0.18340437310299176, 0.02319180657064951, -0.0020039460324347246, 0.16307222784394626, 0.19235432492256754, 0.12020834109486114, 0.11867229340465955, -0.0718148511794691, -0.04540630199707954, -0.21445945444198825, -0.09922323554254524, -0.21243031685547223, 0.0017626521194626281, -0.06402446373364755, -0.18737497459245256, 0.34260220860028867, 0.21683895433315917, 0.20903128765029377, 0.08770516909738411, 0.38668024577995447, 0.05542234344785556, 0.12882134262131664, 0.13608880176864815, 0.21795589406211524, -0.0010840831276188354, 0.05366559183401078, -0.18991421622212795, 0.17861473956997165, 0.013642164458316274] |
1,802.07296 | GASP. VII. Gas accretion onto an isolated galaxy | Theoretically, inflowing filaments of gas are one of the main causes of
growth for a galaxy. Nonetheless, observationally, probing ongoing gas
accretion is challenging. As part of the Gas Stripping Phenomena in galaxies
with MUSE (GASP) program, we present the analysis of a spiral galaxy at
z=0.04648 whose characteristics indeed are consistent with a scenario in which
gas accretion plays a major role. The most salient indirect parts of evidence
that support this picture are: 1) The galaxy is isolated, its position rules
out the mechanisms expected in dense environments. 2) It shows a pronounced
lopsidedness extending toward West. According to the spatially resolved star
formation history, this component was formed <6x10^8 yr ago. 3) It has many
large and elongated HII regions that are indication of a fragmentation due to
disk instability. 4) The stellar and gas kinematics are quite symmetric around
the same axis, but in the gas the locus of negative velocities shows a
convexity toward East, as if new gas has been infalling with different
orientation and velocity. 5) The metallicity distribution is inhomogeneous and
shows exceptionally steep gradients from the center toward the outskirts,
especially in the South-West side. 6) The luminosity weighted age is generally
low (~8 Gyr) and particularly low (<7 Gyr) along a trail crossing the galaxy
from South-West toward North. It might trace the path of the accreted gas.
These findings point to an inflow of gas probably proceeding from the
South-West side of the galaxy.
| astro-ph.GA | theoretically inflowing filaments of gas are one of the main causes of growth for a galaxy nonetheless observationally probing ongoing gas accretion is challenging as part of the gas stripping phenomena in galaxies with muse gasp program we present the analysis of a spiral galaxy at z004648 whose characteristics indeed are consistent with a scenario in which gas accretion plays a major role the most salient indirect parts of evidence that support this picture are 1 the galaxy is isolated its position rules out the mechanisms expected in dense environments 2 it shows a pronounced lopsidedness extending toward west according to the spatially resolved star formation history this component was formed 6x108 yr ago 3 it has many large and elongated hii regions that are indication of a fragmentation due to disk instability 4 the stellar and gas kinematics are quite symmetric around the same axis but in the gas the locus of negative velocities shows a convexity toward east as if new gas has been infalling with different orientation and velocity 5 the metallicity distribution is inhomogeneous and shows exceptionally steep gradients from the center toward the outskirts especially in the southwest side 6 the luminosity weighted age is generally low 8 gyr and particularly low 7 gyr along a trail crossing the galaxy from southwest toward north it might trace the path of the accreted gas these findings point to an inflow of gas probably proceeding from the southwest side of the galaxy | [['theoretically', 'inflowing', 'filaments', 'of', 'gas', 'are', 'one', 'of', 'the', 'main', 'causes', 'of', 'growth', 'for', 'a', 'galaxy', 'nonetheless', 'observationally', 'probing', 'ongoing', 'gas', 'accretion', 'is', 'challenging', 'as', 'part', 'of', 'the', 'gas', 'stripping', 'phenomena', 'in', 'galaxies', 'with', 'muse', 'gasp', 'program', 'we', 'present', 'the', 'analysis', 'of', 'a', 'spiral', 'galaxy', 'at', 'z004648', 'whose', 'characteristics', 'indeed', 'are', 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1,802.07297 | GASP IX. Jellyfish galaxies in phase-space: an orbital study of intense
ram-pressure stripping in clusters | It is well known that galaxies falling into clusters can experience gas
stripping due to ram-pressure by the intra-cluster medium (ICM). The most
spectacular examples are galaxies with extended tails of optically-bright
stripped material known as "jellyfish". We use the first large homogeneous
compilation of jellyfish galaxies in clusters from the WINGS and OmegaWINGS
surveys, and follow-up MUSE observations from the GASP MUSE programme to
investigate the orbital histories of jellyfish galaxies in clusters and
reconstruct their stripping history through position vs. velocity phase- space
diagrams. We construct analytic models to define the regions in phase-space
where ram-pressure stripping is at play. We then study the distribution of
cluster galaxies in phase-space and find that jellyfish galaxies have on
average higher peculiar velocities (and higher cluster velocity dispersion)
than the overall population of cluster galaxies at all clustercentric radii,
which is indicative of recent infall into the cluster and radial orbits. In
particular, the jellyfish galaxies with the longest gas tails reside very near
the cluster cores (in projection) and are moving at very high speeds, which
coincides with the conditions of the most intense ram-pressure. We conclude
that many of the jellyfish galaxies seen in clusters likely formed via fast
(~1- 2 Gyr), incremental, outside-in ram-pressure stripping during first infall
into the cluster in highly radial orbits.
| astro-ph.GA | it is well known that galaxies falling into clusters can experience gas stripping due to rampressure by the intracluster medium icm the most spectacular examples are galaxies with extended tails of opticallybright stripped material known as jellyfish we use the first large homogeneous compilation of jellyfish galaxies in clusters from the wings and omegawings surveys and followup muse observations from the gasp muse programme to investigate the orbital histories of jellyfish galaxies in clusters and reconstruct their stripping history through position vs velocity phase space diagrams we construct analytic models to define the regions in phasespace where rampressure stripping is at play we then study the distribution of cluster galaxies in phasespace and find that jellyfish galaxies have on average higher peculiar velocities and higher cluster velocity dispersion than the overall population of cluster galaxies at all clustercentric radii which is indicative of recent infall into the cluster and radial orbits in particular the jellyfish galaxies with the longest gas tails reside very near the cluster cores in projection and are moving at very high speeds which coincides with the conditions of the most intense rampressure we conclude that many of the jellyfish galaxies seen in clusters likely formed via fast 1 2 gyr incremental outsidein rampressure stripping during first infall into the cluster in highly radial orbits | [['it', 'is', 'well', 'known', 'that', 'galaxies', 'falling', 'into', 'clusters', 'can', 'experience', 'gas', 'stripping', 'due', 'to', 'rampressure', 'by', 'the', 'intracluster', 'medium', 'icm', 'the', 'most', 'spectacular', 'examples', 'are', 'galaxies', 'with', 'extended', 'tails', 'of', 'opticallybright', 'stripped', 'material', 'known', 'as', 'jellyfish', 'we', 'use', 'the', 'first', 'large', 'homogeneous', 'compilation', 'of', 'jellyfish', 'galaxies', 'in', 'clusters', 'from', 'the', 'wings', 'and', 'omegawings', 'surveys', 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1,802.07298 | Attainable Regions of Dynamical Systems | We present a mathematical definition for the attainable region of a dynamical
system, with primary focus on mass action kinetics for chemical reactions. We
characterise this region for linear dynamical systems, and we report on
experiments and conjectures for weakly reversible systems with linkage class
one. A construction due to Vinzant is adapted to give a representation of faces
in the convex hull of trajectories.
| math.DS | we present a mathematical definition for the attainable region of a dynamical system with primary focus on mass action kinetics for chemical reactions we characterise this region for linear dynamical systems and we report on experiments and conjectures for weakly reversible systems with linkage class one a construction due to vinzant is adapted to give a representation of faces in the convex hull of trajectories | [['we', 'present', 'a', 'mathematical', 'definition', 'for', 'the', 'attainable', 'region', 'of', 'a', 'dynamical', 'system', 'with', 'primary', 'focus', 'on', 'mass', 'action', 'kinetics', 'for', 'chemical', 'reactions', 'we', 'characterise', 'this', 'region', 'for', 'linear', 'dynamical', 'systems', 'and', 'we', 'report', 'on', 'experiments', 'and', 'conjectures', 'for', 'weakly', 'reversible', 'systems', 'with', 'linkage', 'class', 'one', 'a', 'construction', 'due', 'to', 'vinzant', 'is', 'adapted', 'to', 'give', 'a', 'representation', 'of', 'faces', 'in', 'the', 'convex', 'hull', 'of', 'trajectories']] | [-0.12110334520156567, 0.08045638371258974, -0.07859636424825742, 0.02216786795224135, -0.030920761780670054, -0.12650808312643605, 0.06793203678770134, 0.3339459053169076, -0.2546534517350105, -0.2359422988903064, 0.10052661173081455, -0.24518073194731888, -0.1656243651245649, 0.21953594711824106, -0.09910633942345157, 0.05107148622091, 0.09554916730580422, 0.037528731322918944, -0.06261549263189618, -0.20502507873595907, 0.3683299011515024, 0.004590452197366036, 0.1965209051250265, 0.07602828073386962, 0.13994815736435928, 0.011535176151217177, 0.0009270192338870121, 0.013244403698123419, -0.17242539970634074, 0.15682681234410176, 0.23954068645834922, 0.13339892049821522, 0.21082633312505025, -0.3751967211468862, -0.2077966261041673, 0.10373682680611428, 0.07919907174811949, 0.12612224871722552, -0.08319801254591976, -0.23579406056266564, 0.0744876304999567, -0.13283631479224334, -0.14137710582894775, -0.08228968869035061, 0.04995994301369557, 0.0031046549431406533, -0.2911622121786842, 0.039561254470250926, 0.06508140676887705, 0.11643368024379015, -0.09744238869931836, -0.08522290542471007, 0.03587231820879074, 0.0831877121845117, -0.033460196784625834, 0.0037011602141249636, 0.15370015499110407, -0.1060034371375178, -0.1335468921237267, 0.41089957379019604, -0.029363209990641244, -0.2372186202985736, 0.2644756951440985, -0.15712549891322852, -0.19251637436951008, 0.10457157307805923, 0.232433457317977, 0.15562667315109419, -0.17669457134145958, 0.08681318016830258, -0.03346536430315329, 0.1374404683136023, 0.016541054382776983, 0.02594360990019945, 0.21498934643772932, 0.22224757730459366, 0.09493583496659994, 0.17210089813631316, -0.03657156085022367, -0.13561081214306447, -0.27716442429675503, -0.1576834777553673, -0.12325967696423713, 0.033833801984572066, -0.01148043878045148, -0.18187341840507892, 0.38608791621831745, 0.10979521038153997, 0.20661192876645007, 0.11525301518491828, 0.22752086004385583, 0.07567764715506481, 0.03875114953575226, 0.022551602118003826, 0.18718201260154063, 0.14823348510723847, 0.0653609313070774, -0.21867856812448455, 0.057153456962595765, 0.12724770116977968] |
1,802.07299 | The frequency of window damage caused by bolide airbursts: a quarter
century case study | We have empirically estimated how often fireball shocks produce overpressure
at the ground sufficient to damage windows. Our study used a numerical entry
model to estimate the energy deposition and shock production for a suite of 23
energetic fireballs reported by US Government sensors over the last quarter
century. For each of these events we estimated the peak overpressure on the
ground and the ground area above overpressure thresholds of 200 and 500 Pa
where light and heavy window damage, respectively, is expected. Our results
suggest that at the highest overpressure it is the rare, large fireballs (such
as the Chelyabinsk fireball) which dominate the long-term areal ground
footprints for heavy window damage. The height at the fireball peak brightness
and the fireball entry angle contribute to the variance in ground overpressure,
with lower heights and shallower angles producing larger ground footprints and
more potential damage. The effective threshold energy for fireballs to produce
heavy window damage is ~5 - 10 kT; such fireballs occur globally once every one
to two years. These largest annual bolide events, should they occur over a
major urban centre with large numbers of windows, can be expected to produce
economically significant window damage. However, the mean frequency of heavy
window damage (overpressure above 500 Pa) from fireball shock waves occurring
over urban areas is estimated to be approximately once every 5000 years. Light
window damage (overpressure above 200 Pa) is expected every ~600 years.
| astro-ph.EP | we have empirically estimated how often fireball shocks produce overpressure at the ground sufficient to damage windows our study used a numerical entry model to estimate the energy deposition and shock production for a suite of 23 energetic fireballs reported by us government sensors over the last quarter century for each of these events we estimated the peak overpressure on the ground and the ground area above overpressure thresholds of 200 and 500 pa where light and heavy window damage respectively is expected our results suggest that at the highest overpressure it is the rare large fireballs such as the chelyabinsk fireball which dominate the longterm areal ground footprints for heavy window damage the height at the fireball peak brightness and the fireball entry angle contribute to the variance in ground overpressure with lower heights and shallower angles producing larger ground footprints and more potential damage the effective threshold energy for fireballs to produce heavy window damage is 5 10 kt such fireballs occur globally once every one to two years these largest annual bolide events should they occur over a major urban centre with large numbers of windows can be expected to produce economically significant window damage however the mean frequency of heavy window damage overpressure above 500 pa from fireball shock waves occurring over urban areas is estimated to be approximately once every 5000 years light window damage overpressure above 200 pa is expected every 600 years | [['we', 'have', 'empirically', 'estimated', 'how', 'often', 'fireball', 'shocks', 'produce', 'overpressure', 'at', 'the', 'ground', 'sufficient', 'to', 'damage', 'windows', 'our', 'study', 'used', 'a', 'numerical', 'entry', 'model', 'to', 'estimate', 'the', 'energy', 'deposition', 'and', 'shock', 'production', 'for', 'a', 'suite', 'of', '23', 'energetic', 'fireballs', 'reported', 'by', 'us', 'government', 'sensors', 'over', 'the', 'last', 'quarter', 'century', 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1,802.073 | Problems in group theory motivated by cryptography | This is a survey of algorithmic problems in group theory, old and new,
motivated by applications to cryptography.
| math.GR cs.CR | this is a survey of algorithmic problems in group theory old and new motivated by applications to cryptography | [['this', 'is', 'a', 'survey', 'of', 'algorithmic', 'problems', 'in', 'group', 'theory', 'old', 'and', 'new', 'motivated', 'by', 'applications', 'to', 'cryptography']] | [-0.10345416047817303, 0.022900739684700966, -0.17074998664773172, 0.06949784668783347, -0.13545397782905233, -0.12397513618796235, 0.09089179235484658, 0.3091186000448134, -0.3524043510357539, -0.3453496398611201, 0.16816214142858776, -0.22274299313236648, -0.22785018839769894, 0.28687606958879364, -0.2724018637608323, 0.056523658542169467, -0.004275783689485656, -0.07275166890273492, -0.04925971762794587, -0.31622922648158336, 0.31798721435997224, 0.029624776500794623, 0.19445396111243302, 0.061448626323706575, 0.06153554412432843, 0.009705110297848782, -0.09665119906680451, 0.02974950811929173, -0.11544173805870944, 0.3020093376334343, 0.3617029154880179, 0.19448743833021986, 0.37332337184084785, -0.3487476016291314, -0.2602812053842677, 0.06766664402352439, 0.1619210665424665, 0.1492433071964317, -0.17678402369428012, -0.2773687593224976, 0.13510908026041257, -0.17312910221517086, -0.15018771943222317, -0.0037425456361638177, 0.06330556246555513, 0.006850665124754111, -0.18397457980447346, 0.04026693837820656, -0.02849009343319469, 0.15849483665078878, -0.0022934258191121947, -0.08920338129003842, 0.18671039326323402, 0.06969434465281665, 0.054456650111306876, 0.056472782873445086, 0.07484446828150088, -0.23333221289794892, -0.22035556183093125, 0.407923658274942, 0.04209784823211117, -0.05287113620175256, 0.14133555012651616, -0.021305976978813607, -0.25508000287744736, 0.03696597119819166, 0.1850785722749101, 0.1634268168773916, -0.1622906187031832, 0.17610417756239055, -0.0815636026673019, 0.1684012222621176, 0.013879862355275286, -0.0038858171966340807, 0.17839761368102497, 0.15309677650738093, 0.0993616307257778, 0.14557905898739895, 0.09751410803033246, -0.13303690496832132, -0.275930546844999, -0.1230568000011974, -0.15648736815071768, 0.057520123250368566, -0.007433597178735201, -0.14298689406779078, 0.3694714605808258, 0.16712538522875142, 0.10808111780271348, -0.012072263182037406, 0.30304211171136963, 0.011822017323639657, 0.04693668977253967, 0.04705685638408694, 0.16295202024694946, 0.2476236035969729, 0.1014120973025759, -0.10268436923312645, -0.038099296416880354, 0.07970222499635485] |
1,802.07301 | On the Connection Between Learning Two-Layers Neural Networks and Tensor
Decomposition | We establish connections between the problem of learning a two-layer neural
network and tensor decomposition. We consider a model with feature vectors
$\boldsymbol x \in \mathbb R^d$, $r$ hidden units with weights $\{\boldsymbol
w_i\}_{1\le i \le r}$ and output $y\in \mathbb R$, i.e., $y=\sum_{i=1}^r
\sigma( \boldsymbol w_i^{\mathsf T}\boldsymbol x)$, with activation functions
given by low-degree polynomials. In particular, if $\sigma(x) =
a_0+a_1x+a_3x^3$, we prove that no polynomial-time learning algorithm can
outperform the trivial predictor that assigns to each example the response
variable $\mathbb E(y)$, when $d^{3/2}\ll r\ll d^2$. Our conclusion holds for a
`natural data distribution', namely standard Gaussian feature vectors
$\boldsymbol x$, and output distributed according to a two-layer neural network
with random isotropic weights, and under a certain complexity-theoretic
assumption on tensor decomposition. Roughly speaking, we assume that no
polynomial-time algorithm can substantially outperform current methods for
tensor decomposition based on the sum-of-squares hierarchy.
We also prove generalizations of this statement for higher degree polynomial
activations, and non-random weight vectors. Remarkably, several existing
algorithms for learning two-layer networks with rigorous guarantees are based
on tensor decomposition. Our results support the idea that this is indeed the
core computational difficulty in learning such networks, under the stated
generative model for the data. As a side result, we show that under this model
learning the network requires accurate learning of its weights, a property that
does not hold in a more general setting.
| cs.LG cs.DS stat.ML | we establish connections between the problem of learning a twolayer neural network and tensor decomposition we consider a model with feature vectors boldsymbol x in mathbb rd r hidden units with weights boldsymbol w_i_1le i le r and output yin mathbb r ie ysum_i1r sigma boldsymbol w_imathsf tboldsymbol x with activation functions given by lowdegree polynomials in particular if sigmax a_0a_1xa_3x3 we prove that no polynomialtime learning algorithm can outperform the trivial predictor that assigns to each example the response variable mathbb ey when d32ll rll d2 our conclusion holds for a natural data distribution namely standard gaussian feature vectors boldsymbol x and output distributed according to a twolayer neural network with random isotropic weights and under a certain complexitytheoretic assumption on tensor decomposition roughly speaking we assume that no polynomialtime algorithm can substantially outperform current methods for tensor decomposition based on the sumofsquares hierarchy we also prove generalizations of this statement for higher degree polynomial activations and nonrandom weight vectors remarkably several existing algorithms for learning twolayer networks with rigorous guarantees are based on tensor decomposition our results support the idea that this is indeed the core computational difficulty in learning such networks under the stated generative model for the data as a side result we show that under this model learning the network requires accurate learning of its weights a property that does not hold in a more general setting | [['we', 'establish', 'connections', 'between', 'the', 'problem', 'of', 'learning', 'a', 'twolayer', 'neural', 'network', 'and', 'tensor', 'decomposition', 'we', 'consider', 'a', 'model', 'with', 'feature', 'vectors', 'boldsymbol', 'x', 'in', 'mathbb', 'rd', 'r', 'hidden', 'units', 'with', 'weights', 'boldsymbol', 'w_i_1le', 'i', 'le', 'r', 'and', 'output', 'yin', 'mathbb', 'r', 'ie', 'ysum_i1r', 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0.10281381440161938, 0.10082587744397796] |
1,802.07302 | A translation of Y. Benoist's "Actions propres sur les espaces
homog\`enes r\'eductifs" | This is a translation of Yves Benoist's "Actions propres sur les espaces
homog\`enes r\'eductifs", Ann. of Math., 144:315-347, 1996.
| math.GR math.DG | this is a translation of yves benoists actions propres sur les espaces homogenes reductifs ann of math 144315347 1996 | [['this', 'is', 'a', 'translation', 'of', 'yves', 'benoists', 'actions', 'propres', 'sur', 'les', 'espaces', 'homogenes', 'reductifs', 'ann', 'of', 'math', '144315347', '1996']] | [-0.12097236120866404, -0.010768171762012772, -0.14301619430383047, -0.02487958191583554, -0.0894947334503134, -0.08104403573088348, -0.13104423373523685, 0.12410297979497248, -0.13022256919389796, -0.32848171413772637, 0.10232139357443278, -0.31163657849861515, -0.23242293629381391, 0.1550238219400247, -0.4355778751584391, -0.02082389396511846, -0.03364681483556827, -0.19906431912548012, 0.10738681960437033, -0.3608891150603692, 0.14873826674496135, 0.13660935141767064, 0.3159095284839471, -0.05184318070920805, 0.22086608787584636, 0.14257214358076453, -0.018744324644406635, -0.22447931073192093, -0.27400833683916265, 0.14598932660495242, 0.38520205362389487, 0.09477852942008111, 0.2865615006950166, -0.20755249686125252, -0.05078269587829709, 0.08825073060062197, -0.057692219503223896, -0.026597682593597308, 0.1677300937784215, -0.4738883541689979, 0.1745597951456956, -0.21056605502963066, 0.04664280803667174, -0.08314470118946499, 0.03320863522175285, -0.009196077576941915, -0.2944217450502846, 0.1489421546769639, 0.2053907681773934, 0.3241246436826057, -0.007148028635937307, -0.2080261049171289, -0.23564255191013217, -0.004581944008047382, -0.09195848560840306, 0.21839898824691772, 0.02315112969113721, 0.037222768399967916, -0.1638318675880631, 0.27632204929573667, -0.04475508237050639, -0.08994004585676724, 0.24418550984046306, 0.08251166330753928, -0.28461118456390166, 0.01456092277334796, 0.1884337241192245, 0.12073780927393171, 0.11272735045188004, 0.3818355398770008, -0.15517553583615357, 0.05293398443609476, 0.26255590758389896, -0.28991856591569054, 0.020629875180828903, 0.03499566949903965, -0.10873080888349149, -0.18993893141547838, -0.04523917436341031, 0.03813505400386122, -0.18099575621050057, -0.3895878257850806, -0.0755164699189158, 0.17431179527193308, 0.0388838813200386, -0.2325344861795505, 0.2113804282465329, 0.04223578061080641, 0.049526582989427775, 0.1331792179391616, 0.029419386591244902, -0.14105091647555432, -0.08963269999043809, 0.18438230017717513, 0.13073591391245523, 0.10409091469935244, 0.28800614343749154, -0.1434682332393196, -0.12106665254880984, 0.37056578199068707] |
1,802.07303 | MoNet: Moments Embedding Network | Bilinear pooling has been recently proposed as a feature encoding layer,
which can be used after the convolutional layers of a deep network, to improve
performance in multiple vision tasks. Different from conventional global
average pooling or fully connected layer, bilinear pooling gathers 2nd order
information in a translation invariant fashion. However, a serious drawback of
this family of pooling layers is their dimensionality explosion. Approximate
pooling methods with compact properties have been explored towards resolving
this weakness. Additionally, recent results have shown that significant
performance gains can be achieved by adding 1st order information and applying
matrix normalization to regularize unstable higher order information. However,
combining compact pooling with matrix normalization and other order information
has not been explored until now. In this paper, we unify bilinear pooling and
the global Gaussian embedding layers through the empirical moment matrix. In
addition, we propose a novel sub-matrix square-root layer, which can be used to
normalize the output of the convolution layer directly and mitigate the
dimensionality problem with off-the-shelf compact pooling methods. Our
experiments on three widely used fine-grained classification datasets
illustrate that our proposed architecture, MoNet, can achieve similar or better
performance than with the state-of-art G2DeNet. Furthermore, when combined with
compact pooling technique, MoNet obtains comparable performance with encoded
features with 96% less dimensions.
| cs.CV | bilinear pooling has been recently proposed as a feature encoding layer which can be used after the convolutional layers of a deep network to improve performance in multiple vision tasks different from conventional global average pooling or fully connected layer bilinear pooling gathers 2nd order information in a translation invariant fashion however a serious drawback of this family of pooling layers is their dimensionality explosion approximate pooling methods with compact properties have been explored towards resolving this weakness additionally recent results have shown that significant performance gains can be achieved by adding 1st order information and applying matrix normalization to regularize unstable higher order information however combining compact pooling with matrix normalization and other order information has not been explored until now in this paper we unify bilinear pooling and the global gaussian embedding layers through the empirical moment matrix in addition we propose a novel submatrix squareroot layer which can be used to normalize the output of the convolution layer directly and mitigate the dimensionality problem with offtheshelf compact pooling methods our experiments on three widely used finegrained classification datasets illustrate that our proposed architecture monet can achieve similar or better performance than with the stateofart g2denet furthermore when combined with compact pooling technique monet obtains comparable performance with encoded features with 96 less dimensions | [['bilinear', 'pooling', 'has', 'been', 'recently', 'proposed', 'as', 'a', 'feature', 'encoding', 'layer', 'which', 'can', 'be', 'used', 'after', 'the', 'convolutional', 'layers', 'of', 'a', 'deep', 'network', 'to', 'improve', 'performance', 'in', 'multiple', 'vision', 'tasks', 'different', 'from', 'conventional', 'global', 'average', 'pooling', 'or', 'fully', 'connected', 'layer', 'bilinear', 'pooling', 'gathers', '2nd', 'order', 'information', 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1,802.07304 | TreeGrafter: phylogenetic tree-based annotation of proteins with Gene
Ontology terms and other annotations | Summary: TreeGrafter is a new software tool for annotating protein sequences
using annotated phylogenetic trees. Cur-rently, the tool provides annotations
to Gene Ontology terms, and PANTHER protein class, family and subfamily. The
ap-proach is generalizable to any annotations that have been made to internal
nodes of a reference phylogenetic tree. Tree-Grafter takes each input query
protein sequence, finds the best matching homologous family in a library of
pre-calculated, pre-annotated gene trees, and then grafts it to the best
location in the tree. It then annotates the sequence by propagating
anno-tations from its ancestral nodes in the reference tree. We show that
TreeGrafter outperforms subfamily HMM scoring for cor-rectly assigning
subfamily membership, and that it produces highly specific annotations of GO
terms based on annotated reference phylogenetic trees. This method will be
further inte-grated into InterProScan, enabling an even broader user
com-munity.
Availability: TreeGrafter is freely available on the web at
https://github.com/haimingt/TreeGrafting.
| q-bio.QM q-bio.GN | summary treegrafter is a new software tool for annotating protein sequences using annotated phylogenetic trees currently the tool provides annotations to gene ontology terms and panther protein class family and subfamily the approach is generalizable to any annotations that have been made to internal nodes of a reference phylogenetic tree treegrafter takes each input query protein sequence finds the best matching homologous family in a library of precalculated preannotated gene trees and then grafts it to the best location in the tree it then annotates the sequence by propagating annotations from its ancestral nodes in the reference tree we show that treegrafter outperforms subfamily hmm scoring for correctly assigning subfamily membership and that it produces highly specific annotations of go terms based on annotated reference phylogenetic trees this method will be further integrated into interproscan enabling an even broader user community availability treegrafter is freely available on the web at httpsgithubcomhaimingttreegrafting | [['summary', 'treegrafter', 'is', 'a', 'new', 'software', 'tool', 'for', 'annotating', 'protein', 'sequences', 'using', 'annotated', 'phylogenetic', 'trees', 'currently', 'the', 'tool', 'provides', 'annotations', 'to', 'gene', 'ontology', 'terms', 'and', 'panther', 'protein', 'class', 'family', 'and', 'subfamily', 'the', 'approach', 'is', 'generalizable', 'to', 'any', 'annotations', 'that', 'have', 'been', 'made', 'to', 'internal', 'nodes', 'of', 'a', 'reference', 'phylogenetic', 'tree', 'treegrafter', 'takes', 'each', 'input', 'query', 'protein', 'sequence', 'finds', 'the', 'best', 'matching', 'homologous', 'family', 'in', 'a', 'library', 'of', 'precalculated', 'preannotated', 'gene', 'trees', 'and', 'then', 'grafts', 'it', 'to', 'the', 'best', 'location', 'in', 'the', 'tree', 'it', 'then', 'annotates', 'the', 'sequence', 'by', 'propagating', 'annotations', 'from', 'its', 'ancestral', 'nodes', 'in', 'the', 'reference', 'tree', 'we', 'show', 'that', 'treegrafter', 'outperforms', 'subfamily', 'hmm', 'scoring', 'for', 'correctly', 'assigning', 'subfamily', 'membership', 'and', 'that', 'it', 'produces', 'highly', 'specific', 'annotations', 'of', 'go', 'terms', 'based', 'on', 'annotated', 'reference', 'phylogenetic', 'trees', 'this', 'method', 'will', 'be', 'further', 'integrated', 'into', 'interproscan', 'enabling', 'an', 'even', 'broader', 'user', 'community', 'availability', 'treegrafter', 'is', 'freely', 'available', 'on', 'the', 'web', 'at', 'httpsgithubcomhaimingttreegrafting']] | [-0.05251765890185394, 0.038194067276816825, -0.00989559867003983, 0.09924006480188738, -0.17040073160220542, -0.15784983111803444, 0.08729604651956391, 0.44600101132449266, -0.26125441987470194, -0.3239535212114051, 0.022096890184518603, -0.2843328328343813, -0.12545666465460248, 0.16937711542296047, -0.09005435286215632, 0.038850978420767304, 0.21896922468865365, 0.1107791839143878, 0.08277711764173079, -0.252847816124936, 0.2891284501796739, 0.06661751402409848, 0.29664739350492536, -0.021588858607149607, 0.11360260726714104, -0.021581317588366015, -0.06251944931510307, 0.01857659439367519, -0.11662808485163771, 0.17612731848635735, 0.3615005828009138, 0.3122652327135281, 0.26626980193336874, -0.3362352153383875, -0.15547666594864348, 0.09304137287875386, 0.16711370621782703, 0.1768523667894958, 0.0050205270637053295, -0.31843693331009837, 0.12544353406819692, -0.1625423768355914, -0.002524010223537885, -0.08919569626576393, 0.017154053728272382, -0.0023255139161404725, -0.25853591956311484, 0.0037619214382249157, 0.02345348976086825, 0.07339724976604024, -0.020674882079883654, -0.143223119422957, -0.08996166949902938, 0.19713240782919064, -0.016859331340104266, 0.10585662954395662, 0.12699929949500272, -0.074025241417395, -0.13781805128815608, 0.3309419967471685, -0.014169744845177676, -0.24098108038369165, 0.1705015722640186, -0.03767414585800489, -0.2387221772774324, 0.14037840196711793, 0.13434579830641882, 0.11473262120617202, -0.24619894182762583, 0.053177444882552466, -0.028551049735019537, 0.22097893764038343, 0.13492439848974952, -0.04787758908020584, 0.2077548145163156, 0.22487420689729923, 0.03288064497000714, 0.1597127545698911, -0.054888591371678015, -0.04405037362782939, -0.20962587884325232, -0.14717218196617338, -0.19359363059551027, -0.0465604964505277, -0.16829361821284103, -0.291004537986442, 0.4017035281537352, 0.15675735500544025, 0.12102369890497947, 0.15024997881846502, 0.24618883172641634, -0.045490429151450865, 0.112224793930796, 0.09136375750735956, 0.04144007862369354, 0.007861786982912972, 0.04305459143329613, -0.11197021528228966, 0.1815561994350188, 0.10262471065397148] |
1,802.07305 | Comparison of collimated blue light generation in ${}^{85}$Rb atoms via
the D${}_1$ and D${}_2$ lines | We experimentally studied the characteristics of the collimated blue light
(CBL) produced in ${}^{85}$Rb vapor by two resonant laser fields exciting atoms
into the $5D_{3/2}$ state, using either the $5P_{1/2}$ or the $5P_{3/2}$
intermediate state. We compared the CBL output at different values of frequency
detunings, powers, and polarizations of the pump lasers in these two cases, and
confirmed the observed trends using a simple theoretical model. We also
demonstrated that the addition of the repump laser, preventing the accumulation
of atomic population in the uncoupled hyperfine ground state, resulted in
nearly an order of magnitude increase in CBL power output. Overall, we found
that the $5S_{1/2} - 5P_{1/2} - 5D_{3/2}$ excitation pathway results in
stronger CBL generation, as we detected up to $4.25~\mu$W using two pumps of
the same linear polarization. The optimum CBL output for the $5S_{1/2} -
5P_{3/2} - 5D_{3/2}$ excitation pathway required the two pump lasers to have
the same circular polarization, but resulted only in a maximum CBL power of
$450$~nW.
| physics.atom-ph physics.optics | we experimentally studied the characteristics of the collimated blue light cbl produced in 85rb vapor by two resonant laser fields exciting atoms into the 5d_32 state using either the 5p_12 or the 5p_32 intermediate state we compared the cbl output at different values of frequency detunings powers and polarizations of the pump lasers in these two cases and confirmed the observed trends using a simple theoretical model we also demonstrated that the addition of the repump laser preventing the accumulation of atomic population in the uncoupled hyperfine ground state resulted in nearly an order of magnitude increase in cbl power output overall we found that the 5s_12 5p_12 5d_32 excitation pathway results in stronger cbl generation as we detected up to 425muw using two pumps of the same linear polarization the optimum cbl output for the 5s_12 5p_32 5d_32 excitation pathway required the two pump lasers to have the same circular polarization but resulted only in a maximum cbl power of 450nw | [['we', 'experimentally', 'studied', 'the', 'characteristics', 'of', 'the', 'collimated', 'blue', 'light', 'cbl', 'produced', 'in', '85rb', 'vapor', 'by', 'two', 'resonant', 'laser', 'fields', 'exciting', 'atoms', 'into', 'the', '5d_32', 'state', 'using', 'either', 'the', '5p_12', 'or', 'the', '5p_32', 'intermediate', 'state', 'we', 'compared', 'the', 'cbl', 'output', 'at', 'different', 'values', 'of', 'frequency', 'detunings', 'powers', 'and', 'polarizations', 'of', 'the', 'pump', 'lasers', 'in', 'these', 'two', 'cases', 'and', 'confirmed', 'the', 'observed', 'trends', 'using', 'a', 'simple', 'theoretical', 'model', 'we', 'also', 'demonstrated', 'that', 'the', 'addition', 'of', 'the', 'repump', 'laser', 'preventing', 'the', 'accumulation', 'of', 'atomic', 'population', 'in', 'the', 'uncoupled', 'hyperfine', 'ground', 'state', 'resulted', 'in', 'nearly', 'an', 'order', 'of', 'magnitude', 'increase', 'in', 'cbl', 'power', 'output', 'overall', 'we', 'found', 'that', 'the', '5s_12', '5p_12', '5d_32', 'excitation', 'pathway', 'results', 'in', 'stronger', 'cbl', 'generation', 'as', 'we', 'detected', 'up', 'to', '425muw', 'using', 'two', 'pumps', 'of', 'the', 'same', 'linear', 'polarization', 'the', 'optimum', 'cbl', 'output', 'for', 'the', '5s_12', '5p_32', '5d_32', 'excitation', 'pathway', 'required', 'the', 'two', 'pump', 'lasers', 'to', 'have', 'the', 'same', 'circular', 'polarization', 'but', 'resulted', 'only', 'in', 'a', 'maximum', 'cbl', 'power', 'of', '450nw']] | [-0.12469088767102221, 0.21218664106645518, -0.008626065359567291, -0.006627265259157866, 0.05955493202782236, -0.13064316059171688, 0.0917209272607579, 0.4521270353812724, -0.2216336978424806, -0.27906872165040114, -0.002930382605700288, -0.26595170137879903, -0.02657080021308502, 0.21414693839615212, 0.062270724290283394, 0.05357605026738384, 0.024219911321415565, -0.025018087081843988, 0.007538856523751747, -0.17623882916668662, 0.25522333269473163, 0.04082110766321421, 0.31849577216780744, 0.015688294437131843, 0.11622849924606271, -0.05591390631743707, 0.0651123546413146, -0.07424559615966472, -0.07730169114411183, 0.09003408943244721, 0.24158454798307502, 0.05394021333195269, 0.24580517998547294, -0.43366606322815643, -0.16805125837563537, 0.07800969915115274, 0.14756132958646048, 0.15646313844481483, -0.06126101985646528, -0.27327059443341567, 0.007134834691532888, -0.15746422453667036, -0.10723769903124776, -0.0320268930925522, -0.017984073678962886, 0.04551789203833323, -0.2898856084430008, 0.017949137526557024, 0.04362225328914064, 0.07998768803081475, -0.10131649846007348, -0.153482847964915, -0.0889522948069498, 0.08100061240111245, -0.008225889949972042, 0.020652753494505304, 0.1506896778006194, -0.12755454755388201, -0.12345394525532356, 0.3325754223544209, -0.14537411876153783, -0.05954578358796425, 0.14866332251694986, -0.20577681115537416, -0.05772533811395988, 0.17852874727977905, 0.11871490243065637, 0.12231395865092054, -0.06797410966464668, -0.04288381357982871, 0.03273932915762998, 0.2360587893635966, 0.1871526514412835, 0.09857273234520107, 0.17157957907838864, 0.13567657093226443, 0.0038807189303042833, 0.19151684417010983, -0.12622524851849448, -0.06574217716624844, -0.22524743136309552, -0.0990274607174797, -0.1548600499285385, 0.05562719309455133, -0.0339235523073512, -0.06084846279991325, 0.452228249120526, 0.11100306287116837, 0.1698353372148631, -0.03862240197922802, 0.33652835274115206, 0.14963084343398805, 0.02810055558657041, 0.018850156189728295, 0.3464621004124638, 0.1530937647083192, 0.09308144322567387, -0.29780693123466334, 0.041592257242882624, -0.05233090686015203] |
1,802.07306 | Spectrum of a linear differential equation with constant coefficients | In this paper we compute the spectrum, in the sense of Berkovich, of an
ultrametric linear differential equation with constant coefficients, defined
over an affinoid domain of the analytic affine line $A_k^{1,an}$. We show that
it is a finite union of either closed disks or topological closures of open
disks and that it satisfies a continuity property.
| math.NT math.SP | in this paper we compute the spectrum in the sense of berkovich of an ultrametric linear differential equation with constant coefficients defined over an affinoid domain of the analytic affine line a_k1an we show that it is a finite union of either closed disks or topological closures of open disks and that it satisfies a continuity property | [['in', 'this', 'paper', 'we', 'compute', 'the', 'spectrum', 'in', 'the', 'sense', 'of', 'berkovich', 'of', 'an', 'ultrametric', 'linear', 'differential', 'equation', 'with', 'constant', 'coefficients', 'defined', 'over', 'an', 'affinoid', 'domain', 'of', 'the', 'analytic', 'affine', 'line', 'a_k1an', 'we', 'show', 'that', 'it', 'is', 'a', 'finite', 'union', 'of', 'either', 'closed', 'disks', 'or', 'topological', 'closures', 'of', 'open', 'disks', 'and', 'that', 'it', 'satisfies', 'a', 'continuity', 'property']] | [-0.18179980031813361, 0.056755799455588986, -0.09949633856636605, 0.030425444677738205, -0.10348779209224242, -0.06298646272625774, -0.007545091026778599, 0.36512914948148784, -0.36856584902852774, -0.14796583760263665, 0.10261198768109482, -0.2625253041873553, -0.13942453811926367, 0.20627076569196237, -0.10986290413088032, 0.03461739447500024, 0.028668008553462902, 0.042532408385471045, -0.0979557215884727, -0.2869180101552047, 0.4092586958182177, -0.0648894210212997, 0.20326383822664087, 0.04443995793449825, 0.1617847220456627, -0.022943438342606117, -0.02196536771953106, 0.06761270709102973, -0.213823475751529, 0.12036232991210584, 0.285857085961782, 0.10004665343356985, 0.2156400307347732, -0.38292981662587927, -0.18635708886930452, 0.14731576355240708, 0.15293220317523396, -0.010474588755252106, -0.011184454573334992, -0.24424067292628543, 0.13759181224408426, -0.15630721761512437, -0.19168989691284619, -0.03367666933419449, 0.07845767391180354, 0.01841214658426387, -0.23761539796500333, -0.0059935852020446745, 0.17347784343707776, 0.13493044993707112, -0.13081611978122965, -0.016200405919724808, -0.030812332972085903, 0.06315334650571458, -0.015507488765121837, 0.07210040178948215, 0.07715712744642847, -0.10019869165677976, -0.08470286591494057, 0.3501027573698333, -0.13991140765470586, -0.2608649059797504, 0.12428288747988907, -0.1740203076083812, -0.11619253851157348, 0.10601201683415898, 0.10806293403896104, 0.1446775533258915, -0.0708789802489004, 0.24010265706186015, -0.12812643930997833, 0.11250180447366022, 0.07937945668319506, 0.009867418249736406, 0.14987287956422993, 0.07265884801745415, 0.13839947081786313, 0.13677435680957778, 0.010068636487371154, -0.1064795953986634, -0.35912464473066, -0.21913104900158942, -0.15078666563411908, 0.1140906766439522, -0.09964730649595108, -0.30671676369716544, 0.33845389171827783, 0.03715453514762755, 0.22809769816064676, 0.08532268198073975, 0.2634299412768866, 0.14918252426598752, 0.014860064893062892, 0.12804920890734398, 0.12313836344817121, 0.16493868940908993, 0.003020587466640531, -0.18139915274722235, 0.022679280697567656, 0.12051943852566183] |
1,802.07307 | Unsupervised Phase Mapping of X-ray Diffraction Data by Nonnegative
Matrix Factorization Integrated with Custom Clustering | Analyzing large X-ray diffraction (XRD) datasets is a key step in
high-throughput mapping of the compositional phase diagrams of combinatorial
materials libraries. Optimizing and automating this task can help accelerate
the process of discovery of materials with novel and desirable properties.
Here, we report a new method for pattern analysis and phase extraction of XRD
datasets. The method expands the Nonnegative Matrix Factorization method, which
has been used previously to analyze such datasets, by combining it with custom
clustering and cross-correlation algorithms. This new method is capable of
robust determination of the number of basis patterns present in the data which,
in turn, enables straightforward identification of any possible peak-shifted
patterns. Peak-shifting arises due to continuous change in the lattice
constants as a function of composition, and is ubiquitous in XRD datasets from
composition spread libraries. Successful identification of the peak-shifted
patterns allows proper quantification and classification of the basis XRD
patterns, which is necessary in order to decipher the contribution of each
unique single-phase structure to the multi-phase regions. The process can be
utilized to determine accurately the compositional phase diagram of a system
under study. The presented method is applied to one synthetic and one
experimental dataset, and demonstrates robust accuracy and identification
abilities.
| cond-mat.mtrl-sci stat.ML | analyzing large xray diffraction xrd datasets is a key step in highthroughput mapping of the compositional phase diagrams of combinatorial materials libraries optimizing and automating this task can help accelerate the process of discovery of materials with novel and desirable properties here we report a new method for pattern analysis and phase extraction of xrd datasets the method expands the nonnegative matrix factorization method which has been used previously to analyze such datasets by combining it with custom clustering and crosscorrelation algorithms this new method is capable of robust determination of the number of basis patterns present in the data which in turn enables straightforward identification of any possible peakshifted patterns peakshifting arises due to continuous change in the lattice constants as a function of composition and is ubiquitous in xrd datasets from composition spread libraries successful identification of the peakshifted patterns allows proper quantification and classification of the basis xrd patterns which is necessary in order to decipher the contribution of each unique singlephase structure to the multiphase regions the process can be utilized to determine accurately the compositional phase diagram of a system under study the presented method is applied to one synthetic and one experimental dataset and demonstrates robust accuracy and identification abilities | [['analyzing', 'large', 'xray', 'diffraction', 'xrd', 'datasets', 'is', 'a', 'key', 'step', 'in', 'highthroughput', 'mapping', 'of', 'the', 'compositional', 'phase', 'diagrams', 'of', 'combinatorial', 'materials', 'libraries', 'optimizing', 'and', 'automating', 'this', 'task', 'can', 'help', 'accelerate', 'the', 'process', 'of', 'discovery', 'of', 'materials', 'with', 'novel', 'and', 'desirable', 'properties', 'here', 'we', 'report', 'a', 'new', 'method', 'for', 'pattern', 'analysis', 'and', 'phase', 'extraction', 'of', 'xrd', 'datasets', 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1,802.07308 | On Pauli Reductions of Supergravities in Six and Five Dimensions | The dimensional reduction of a generic theory on a curved internal space such
as a sphere does not admit a consistent truncation to a finite set of fields
that includes the Yang-Mills gauge bosons of the isometry group. In rare cases,
for example the $S^7$ reduction of eleven-dimensional supergravity, such a
consistent "Pauli reduction" does exist. In this paper we study this existence
question in two examples of $S^2$ reductions of supergravities. We do this by
making use of a relation between certain $S^2$ reductions and group manifold
$S^3=SU(2)$ reductions of a theory in one dimension higher. By this means we
establish the non-existence of a consistent $S^2$ Pauli reduction of
five-dimensional minimal supergravity. We also show that a
previously-discovered consistent Pauli reduction of six-dimensional
Salam-Sezgin supergravity can be elegantly understood via a group-manifold
reduction from seven dimensions.
| hep-th | the dimensional reduction of a generic theory on a curved internal space such as a sphere does not admit a consistent truncation to a finite set of fields that includes the yangmills gauge bosons of the isometry group in rare cases for example the s7 reduction of elevendimensional supergravity such a consistent pauli reduction does exist in this paper we study this existence question in two examples of s2 reductions of supergravities we do this by making use of a relation between certain s2 reductions and group manifold s3su2 reductions of a theory in one dimension higher by this means we establish the nonexistence of a consistent s2 pauli reduction of fivedimensional minimal supergravity we also show that a previouslydiscovered consistent pauli reduction of sixdimensional salamsezgin supergravity can be elegantly understood via a groupmanifold reduction from seven dimensions | [['the', 'dimensional', 'reduction', 'of', 'a', 'generic', 'theory', 'on', 'a', 'curved', 'internal', 'space', 'such', 'as', 'a', 'sphere', 'does', 'not', 'admit', 'a', 'consistent', 'truncation', 'to', 'a', 'finite', 'set', 'of', 'fields', 'that', 'includes', 'the', 'yangmills', 'gauge', 'bosons', 'of', 'the', 'isometry', 'group', 'in', 'rare', 'cases', 'for', 'example', 'the', 's7', 'reduction', 'of', 'elevendimensional', 'supergravity', 'such', 'a', 'consistent', 'pauli', 'reduction', 'does', 'exist', 'in', 'this', 'paper', 'we', 'study', 'this', 'existence', 'question', 'in', 'two', 'examples', 'of', 's2', 'reductions', 'of', 'supergravities', 'we', 'do', 'this', 'by', 'making', 'use', 'of', 'a', 'relation', 'between', 'certain', 's2', 'reductions', 'and', 'group', 'manifold', 's3su2', 'reductions', 'of', 'a', 'theory', 'in', 'one', 'dimension', 'higher', 'by', 'this', 'means', 'we', 'establish', 'the', 'nonexistence', 'of', 'a', 'consistent', 's2', 'pauli', 'reduction', 'of', 'fivedimensional', 'minimal', 'supergravity', 'we', 'also', 'show', 'that', 'a', 'previouslydiscovered', 'consistent', 'pauli', 'reduction', 'of', 'sixdimensional', 'salamsezgin', 'supergravity', 'can', 'be', 'elegantly', 'understood', 'via', 'a', 'groupmanifold', 'reduction', 'from', 'seven', 'dimensions']] | [-0.1583758218152712, 0.12042198310647269, -0.024042301311376777, 0.10551454238114222, -0.0924162040293381, -0.103021240714417, 0.04493088766107308, 0.2955168342382154, -0.157862026918926, -0.24962369047160096, 0.1265587213325917, -0.25830559904331013, -0.18755389488925336, 0.15962670918473604, -0.13090776808231191, -0.019648671499453485, 0.029575985787874636, 0.05524397082798019, -0.18412423456645818, -0.2912047165172065, 0.3219603027631392, -0.045309770857837814, 0.24961422239978084, 0.01054364354486632, 0.16558916581904187, -0.0003497774262487998, 0.011135676378805382, 0.07523404137366603, -0.09873694984761482, 0.14817171809708646, 0.24281419637297993, 0.09221941804314744, 0.15124837899758645, -0.40596917008652406, -0.2614078185904552, 0.13514026712201646, 0.19066359679324224, 0.15904107670683196, -0.02018425083866425, -0.24519935959046157, 0.059036587412907356, -0.20751787943984656, -0.15956484567911555, -0.10879415795480941, -0.012175559246850967, -0.1043655489835039, -0.23693743147476412, 0.09277957784476765, 0.09753922305689604, 0.0828548106869943, -0.07531378462034113, -0.04431807774338214, -0.051488876104806826, 0.0347822445730665, 0.07323215514257111, 0.047260888302630255, 0.08461934419157092, -0.11657855854274898, -0.16970610862721086, 0.38088025650872354, -0.09214832887707469, -0.2527333416099496, 0.1836401332197163, -0.11818023875136585, -0.19898374644724434, 0.1487289034309523, 0.13411529439241243, 0.1351926223073593, -0.1259020368417944, 0.20967651492708897, -0.10355656416504644, 0.14450880830169327, 0.09949508248417474, 0.029287088867824745, 0.15707078619572498, 0.13067550326505786, 0.10042285091913072, 0.11692947600129307, -5.2275969852309896e-05, -0.06772885606487226, -0.449322446660303, -0.17604974443983176, -0.09704720184227507, 0.17513955081994936, -0.13892713609493512, -0.1574992726365214, 0.3351974299293943, 0.06744027535066432, 0.19881245849982782, 0.05453823376036085, 0.18230430465294323, 0.07483885775378868, 0.08743744399330086, 0.039836188285228086, 0.2227879787233713, 0.1521874926333754, -0.008844349769574097, -0.22516933357581045, -0.13841625385205536, 0.1532106409617614] |
1,802.07309 | Detection limits in the high-dimensional spiked rectangular model | We study the problem of detecting the presence of a single unknown spike in a
rectangular data matrix, in a high-dimensional regime where the spike has fixed
strength and the aspect ratio of the matrix converges to a finite limit. This
setup includes Johnstone's spiked covariance model. We analyze the likelihood
ratio of the spiked model against an "all noise" null model of reference, and
show it has asymptotically Gaussian fluctuations in a region below---but in
general not up to---the so-called BBP threshold from random matrix theory. Our
result parallels earlier findings of Onatski et al.\ (2013) and
Johnstone-Onatski (2015) for spherical spikes. We present a probabilistic
approach capable of treating generic product priors. In particular, sparsity in
the spike is allowed. Our approach is based on Talagrand's interpretation of
the cavity method from spin-glass theory. The question of the maximal parameter
region where asymptotic normality is expected to hold is left open. This region
is shaped by the prior in a non-trivial way. We conjecture that this is the
entire paramagnetic phase of an associated spin-glass model, and is defined by
the vanishing of the replica-symmetric solution of Lesieur et al.\ (2015).
| math.ST math.PR stat.ML stat.TH | we study the problem of detecting the presence of a single unknown spike in a rectangular data matrix in a highdimensional regime where the spike has fixed strength and the aspect ratio of the matrix converges to a finite limit this setup includes johnstones spiked covariance model we analyze the likelihood ratio of the spiked model against an all noise null model of reference and show it has asymptotically gaussian fluctuations in a region belowbut in general not up tothe socalled bbp threshold from random matrix theory our result parallels earlier findings of onatski et al 2013 and johnstoneonatski 2015 for spherical spikes we present a probabilistic approach capable of treating generic product priors in particular sparsity in the spike is allowed our approach is based on talagrands interpretation of the cavity method from spinglass theory the question of the maximal parameter region where asymptotic normality is expected to hold is left open this region is shaped by the prior in a nontrivial way we conjecture that this is the entire paramagnetic phase of an associated spinglass model and is defined by the vanishing of the replicasymmetric solution of lesieur et al 2015 | [['we', 'study', 'the', 'problem', 'of', 'detecting', 'the', 'presence', 'of', 'a', 'single', 'unknown', 'spike', 'in', 'a', 'rectangular', 'data', 'matrix', 'in', 'a', 'highdimensional', 'regime', 'where', 'the', 'spike', 'has', 'fixed', 'strength', 'and', 'the', 'aspect', 'ratio', 'of', 'the', 'matrix', 'converges', 'to', 'a', 'finite', 'limit', 'this', 'setup', 'includes', 'johnstones', 'spiked', 'covariance', 'model', 'we', 'analyze', 'the', 'likelihood', 'ratio', 'of', 'the', 'spiked', 'model', 'against', 'an', 'all', 'noise', 'null', 'model', 'of', 'reference', 'and', 'show', 'it', 'has', 'asymptotically', 'gaussian', 'fluctuations', 'in', 'a', 'region', 'belowbut', 'in', 'general', 'not', 'up', 'tothe', 'socalled', 'bbp', 'threshold', 'from', 'random', 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1,802.0731 | Simple proofs and expressions for the restricted partition function and
its polynomial part | In this note, we provide a simple derivation of expressions for the
restricted partition function and its polynomial part. Our proof relies on
elementary algebra on rational functions and a lemma that expresses the
polynomial part as an average of the partition function.
| math.CO | in this note we provide a simple derivation of expressions for the restricted partition function and its polynomial part our proof relies on elementary algebra on rational functions and a lemma that expresses the polynomial part as an average of the partition function | [['in', 'this', 'note', 'we', 'provide', 'a', 'simple', 'derivation', 'of', 'expressions', 'for', 'the', 'restricted', 'partition', 'function', 'and', 'its', 'polynomial', 'part', 'our', 'proof', 'relies', 'on', 'elementary', 'algebra', 'on', 'rational', 'functions', 'and', 'a', 'lemma', 'that', 'expresses', 'the', 'polynomial', 'part', 'as', 'an', 'average', 'of', 'the', 'partition', 'function']] | [-0.11768454187657944, -0.029809708703988837, -0.15678656932919524, 0.07092118136270709, -0.10881498061813587, -0.05067159371927034, 0.05340111938705885, 0.26377452494100084, -0.2861374984820222, -0.2117903206800652, 0.08494558852155108, -0.21350907245759182, -0.22538105589148133, 0.2298140201587663, -0.057736875879210094, -0.01662967445160977, 0.02525929339923138, 0.08212037141459215, -0.08791444250815657, -0.25739552721727726, 0.33110516492364017, 0.0031591976104780686, 0.207496308380478, 0.15297291908673075, 0.18485786399782397, 0.12240906782058436, -0.06199658357776528, -0.08244576963574388, -0.1540588787711174, 0.12239489864644616, 0.20968515432418086, 0.1619074034916107, 0.26089326944202185, -0.41130673192268197, -0.04194957953552867, 0.1428321396152294, 0.18391626609792544, 0.05403273258098336, -0.02906746889984365, -0.17007332559415075, 0.06313700831040393, -0.18822567922951178, -0.15951388979027437, -0.05243973338673281, 0.058804349778869815, 0.03633431139467067, -0.2894552559700123, 0.036188871664709826, 0.12478229052625424, 0.13544892630171637, -0.061734525370411575, -0.1533278816184679, 0.05215337475610161, 0.0825360112628618, -0.05601916891024556, 0.09148005700431937, 0.10773922356798551, -0.12591322902914917, -0.0849975006828128, 0.32658341429521176, -0.039495090694101745, -0.3187077315740807, 0.12970185918776794, -0.10984049769941458, -0.19204371847039045, 0.04503331627956657, 0.11690513799400178, 0.17267305993063506, -0.07592436684252218, 0.15688959400570238, -0.15817029293366644, 0.14342440815837404, 0.05869284168232319, 0.032326026592230384, 0.1437901425308028, 0.07025389293165402, 0.08048206847161055, 0.23237487275240032, 0.086270040085236, -0.08400332377573778, -0.4181754615396088, -0.19386888438359248, -0.2647383333248801, 0.07581910840777117, -0.1336943578769637, -0.2634908178777889, 0.4621425740594088, 0.056923068063550214, 0.18478267639875412, 0.2342697882938177, 0.2792570877733619, 0.22801684467988306, 0.07058701337163531, 0.009198862171277057, 0.138180011915866, 0.14859633984823906, 0.03417380775736515, -0.13720820795441435, 0.08389552637154973, 0.24026120261310838] |
1,802.07311 | Decameter Type III-Like Bursts | We report the first observations of Type III-like bursts at frequencies 10 30
MHz. More than 1000 such bursts during 2002 2004 have been analyzed. The
frequency drift of these bursts is several times that of decameter Type III
bursts. A typical duration of the Type III-like bursts is 1 2 s. These bursts
are mainly observed when the source active region is located within a few days
from the central meridian. The drift rate of the Type III-like bursts can take
a large value by considering the velocity of Type III electrons and the group
velocity of generated electromagnetic waves.
| astro-ph.SR | we report the first observations of type iiilike bursts at frequencies 10 30 mhz more than 1000 such bursts during 2002 2004 have been analyzed the frequency drift of these bursts is several times that of decameter type iii bursts a typical duration of the type iiilike bursts is 1 2 s these bursts are mainly observed when the source active region is located within a few days from the central meridian the drift rate of the type iiilike bursts can take a large value by considering the velocity of type iii electrons and the group velocity of generated electromagnetic waves | [['we', 'report', 'the', 'first', 'observations', 'of', 'type', 'iiilike', 'bursts', 'at', 'frequencies', '10', '30', 'mhz', 'more', 'than', '1000', 'such', 'bursts', 'during', '2002', '2004', 'have', 'been', 'analyzed', 'the', 'frequency', 'drift', 'of', 'these', 'bursts', 'is', 'several', 'times', 'that', 'of', 'decameter', 'type', 'iii', 'bursts', 'a', 'typical', 'duration', 'of', 'the', 'type', 'iiilike', 'bursts', 'is', '1', '2', 's', 'these', 'bursts', 'are', 'mainly', 'observed', 'when', 'the', 'source', 'active', 'region', 'is', 'located', 'within', 'a', 'few', 'days', 'from', 'the', 'central', 'meridian', 'the', 'drift', 'rate', 'of', 'the', 'type', 'iiilike', 'bursts', 'can', 'take', 'a', 'large', 'value', 'by', 'considering', 'the', 'velocity', 'of', 'type', 'iii', 'electrons', 'and', 'the', 'group', 'velocity', 'of', 'generated', 'electromagnetic', 'waves']] | [-0.14724883668488906, 0.19998396442520736, 0.037192876519875066, 0.1013303472842597, -0.08735767449252307, -0.10489686588194258, 0.05566387375964239, 0.4024705488492947, -0.22124098096789774, -0.3113190414808174, 0.12610429233530224, -0.29282331847272225, -0.034991801052474146, 0.26333833790596317, 0.002111496523398408, -0.09007364493047837, 0.06541940399346467, 0.0061688089079343445, -0.04192966102659333, -0.17907272563269822, 0.2538649878662891, 0.08900894848906463, 0.2266494242640415, -0.08431154767069782, 0.07334702643611939, -0.10540931392922112, -0.06753959083966542, -0.03604385524176725, -0.10123409363384979, 0.015202532718326934, 0.2116561105087547, 0.10654468879122103, 0.27977135845247914, -0.4185616861715323, -0.2552103789633896, 0.09340416758072258, 0.11872594270366474, 0.026200784029125578, -0.03810752147078482, -0.30327800943949584, 0.0922043265747183, -0.19227865130161073, -0.13472956480310844, 0.1529275978186933, 0.15203229069599125, 0.13470285793877032, -0.19218392821379227, 0.15485067410154804, 0.026120108238762558, 0.07831638929719972, -0.07156302936670214, -0.057541916589483176, 0.04226473912983985, 0.06794160231400401, 0.06470810080933763, 0.028578384106259534, 0.12853546993401233, -0.06461573507415481, -0.07680835644022958, 0.3549880192126378, -0.04677638568581741, 0.00605105890864783, 0.20648179161777297, -0.2233626923413191, -0.11568090436740382, 0.24762534953211204, 0.16128050021384613, 0.12062434365714689, -0.14607429830083685, -0.010228574908186341, 0.032561100964056386, 0.20461317122277647, 0.1052456030271726, 0.030453953191195385, 0.2274631082292388, 0.12391646965960096, -0.031264213204273195, 0.04750137262064779, -0.2874493060615098, 0.02962020036792106, -0.3229531701757932, -0.05964263822735831, -0.13013268127982128, 0.11638132495215477, -0.0765835573066298, -0.083757173505123, 0.4523277598442418, 0.039289598680553164, 0.1612721663775236, 0.044419971799551705, 0.17331752584933643, 0.10628088774841905, 0.09359753488258708, 0.12695292764490856, 0.32100904102225114, 0.1016594416480327, 0.1326920840483491, -0.14712629499752997, 0.06709281552011276, 0.046365346340001515] |
1,802.07312 | Why are Megaprojects, Including Nuclear Power Plants, Delivered
Overbudget and Late? Reasons and Remedies | In the first section, this report analyses Nuclear Power Plants (NPPs) in the
context of megaprojects, explaining why they are often delivered over budget
and late. In the second section, the report discusses how Small Modular
Reactors (SMRs) might address these issues. Megaprojects are extremely risky
and often implemented after a sub-optimal phase of project planning leading to
underestimations of the costs and overestimation of short-term benefits. When
considering adherence to schedule and budget, often megaprojects might be
considered a failure, and optimism bias, strategic mis-rapresentation,
complexity, poor planning, poor risk allocation, poor scope management are all
reasons to explain their over budget and delay. For megaprojects, especially in
the nuclear field, a key strategy to achieve good performances appears to be
the standardization. This standardization needs to be twofold: (i) technical
standardisation, i.e. the construction of very similar design over and over,
and (ii) the project delivery chain standardisation, i.e. the same stakeholders
involved in the delivery of a project that is replicable multiple times. Under
this perspective, given their size and standardisation potential, SMRs, might
be a suitable class of NPP for several countries. Yet, if the economy of scale
is the only driver considered, SMRs are hardly competitive with large NPPs (or
even with gas or coal power plants). However, a fleet of standard SMRs might
balance the lack of economy of scale with the economy of multiples, and the
delivery of several standardised SMR projects might be the key to achieve good
project management performances in the nuclear sector. However, the deployment
of SMRs faces a number of challenges from several perspectives, such as the
licencing, supply chain and financing ones. These challenges might be enormous,
but so are the potential rewards too.
| physics.soc-ph q-fin.GN | in the first section this report analyses nuclear power plants npps in the context of megaprojects explaining why they are often delivered over budget and late in the second section the report discusses how small modular reactors smrs might address these issues megaprojects are extremely risky and often implemented after a suboptimal phase of project planning leading to underestimations of the costs and overestimation of shortterm benefits when considering adherence to schedule and budget often megaprojects might be considered a failure and optimism bias strategic misrapresentation complexity poor planning poor risk allocation poor scope management are all reasons to explain their over budget and delay for megaprojects especially in the nuclear field a key strategy to achieve good performances appears to be the standardization this standardization needs to be twofold i technical standardisation ie the construction of very similar design over and over and ii the project delivery chain standardisation ie the same stakeholders involved in the delivery of a project that is replicable multiple times under this perspective given their size and standardisation potential smrs might be a suitable class of npp for several countries yet if the economy of scale is the only driver considered smrs are hardly competitive with large npps or even with gas or coal power plants however a fleet of standard smrs might balance the lack of economy of scale with the economy of multiples and the delivery of several standardised smr projects might be the key to achieve good project management performances in the nuclear sector however the deployment of smrs faces a number of challenges from several perspectives such as the licencing supply chain and financing ones these challenges might be enormous but so are the potential rewards too | [['in', 'the', 'first', 'section', 'this', 'report', 'analyses', 'nuclear', 'power', 'plants', 'npps', 'in', 'the', 'context', 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1,802.07313 | A Novel Hybrid Islanding Detection Method for Inverter-based DG | A novel method for achieving a better performance using the combination of
the available passive and active methods has been proposed. The algorithm
detects the islanding in proper time by using harmonic detection, the average
rate of change of voltage and shifting power generation. Harmonic detection in
this method decreases process time and also differentiates between islanding
and other power systems events. For harmonic detection, extended Kalman filter
has been used. Besides, the reliability of the method increases using the
average rate of change of the voltage. The proposed method uses a strategy for
decreasing the non-detection zone. In this strategy, minimum and maximum
average rates of change of voltage limits are defined to improve the security
of the system. Therefore, three main specifications of a proper method,
reliability, security and time of process are achievable by the combination of
these passive and active methods. By applying different power system events
under different power conditions, the proposed method has been verified in
Simulink software.
| eess.SP | a novel method for achieving a better performance using the combination of the available passive and active methods has been proposed the algorithm detects the islanding in proper time by using harmonic detection the average rate of change of voltage and shifting power generation harmonic detection in this method decreases process time and also differentiates between islanding and other power systems events for harmonic detection extended kalman filter has been used besides the reliability of the method increases using the average rate of change of the voltage the proposed method uses a strategy for decreasing the nondetection zone in this strategy minimum and maximum average rates of change of voltage limits are defined to improve the security of the system therefore three main specifications of a proper method reliability security and time of process are achievable by the combination of these passive and active methods by applying different power system events under different power conditions the proposed method has been verified in simulink software | [['a', 'novel', 'method', 'for', 'achieving', 'a', 'better', 'performance', 'using', 'the', 'combination', 'of', 'the', 'available', 'passive', 'and', 'active', 'methods', 'has', 'been', 'proposed', 'the', 'algorithm', 'detects', 'the', 'islanding', 'in', 'proper', 'time', 'by', 'using', 'harmonic', 'detection', 'the', 'average', 'rate', 'of', 'change', 'of', 'voltage', 'and', 'shifting', 'power', 'generation', 'harmonic', 'detection', 'in', 'this', 'method', 'decreases', 'process', 'time', 'and', 'also', 'differentiates', 'between', 'islanding', 'and', 'other', 'power', 'systems', 'events', 'for', 'harmonic', 'detection', 'extended', 'kalman', 'filter', 'has', 'been', 'used', 'besides', 'the', 'reliability', 'of', 'the', 'method', 'increases', 'using', 'the', 'average', 'rate', 'of', 'change', 'of', 'the', 'voltage', 'the', 'proposed', 'method', 'uses', 'a', 'strategy', 'for', 'decreasing', 'the', 'nondetection', 'zone', 'in', 'this', 'strategy', 'minimum', 'and', 'maximum', 'average', 'rates', 'of', 'change', 'of', 'voltage', 'limits', 'are', 'defined', 'to', 'improve', 'the', 'security', 'of', 'the', 'system', 'therefore', 'three', 'main', 'specifications', 'of', 'a', 'proper', 'method', 'reliability', 'security', 'and', 'time', 'of', 'process', 'are', 'achievable', 'by', 'the', 'combination', 'of', 'these', 'passive', 'and', 'active', 'methods', 'by', 'applying', 'different', 'power', 'system', 'events', 'under', 'different', 'power', 'conditions', 'the', 'proposed', 'method', 'has', 'been', 'verified', 'in', 'simulink', 'software']] | [-0.11516873335264191, 0.030466957818489612, -0.07093872027130933, -0.01574809734610448, -0.009817470908562494, -0.1486975804323376, 0.08679880401142305, 0.3965354480641531, -0.23125182753485604, -0.34399119762294905, 0.11133330082236903, -0.2306558007982037, -0.12331185691774164, 0.26506874517242357, -0.08528851607825788, 0.12176506756520944, 0.03736125280734197, 0.028047048997860854, -0.042824881648213214, -0.24998540776531872, 0.2540517112228838, 0.12326999371246684, 0.36780233903810744, 0.038350473028513965, 0.13005294742221693, -0.014640773623884853, -0.0653787307986399, 0.031740819345364664, -0.05853466299062924, 0.10649917859274599, 0.2089723757618652, 0.17150084919256453, 0.3124847728929414, -0.37252833438141375, -0.23227937974989776, 0.10657467421076101, 0.12584186066155004, 0.058983520113454174, -0.05607301314225102, -0.2683128722525974, 0.1129252327799161, -0.21532186253632352, -0.08030791596861601, -0.03708673988060072, -0.0029766472772036383, 0.0861716721336096, -0.2814296945296342, 0.0924912486124213, 0.0662801536254403, 0.074107069840155, -0.045061864279687586, -0.10145393511842618, -0.01778016418428728, 0.17023178989478677, 0.022888572721546176, -0.006906026502980328, 0.16869776428850344, -0.08868294176020909, -0.1471417959859004, 0.3265579643420784, -0.08668000274621768, -0.16780923532958075, 0.16575730354638724, -0.07704001832923783, -0.10638608723376997, 0.17565764592415312, 0.21189247092470617, 0.12369812710392403, -0.16374639476217875, 0.01978369500940927, 0.04843652019527082, 0.17578642506424974, 0.05821717228944891, 0.014807130269728965, 0.1694417691849195, 0.22510453371228878, 0.09370422681293837, 0.15040208582188536, -0.1374814023615838, -0.05078099880341963, -0.2318629249816806, -0.14653346763012318, -0.18137881944734013, -0.06563579656074403, -0.08220880522001209, -0.08136976034403211, 0.43802090491190915, 0.18147374014938022, 0.1262344882082444, 0.05740579948959327, 0.382088149582581, 0.17384844729903995, 0.07257666888010757, 0.05155092736183688, 0.26571845137173444, 0.07623542950732815, 0.11404774932292994, -0.2554305618765151, 0.09965613495740222, 0.0599856299529897] |
1,802.07314 | On the chemical abundances of Miras in clusters: V1 in the metal-rich
globular NGC 5927 | We present the first spectroscopic abundance determination of iron,
alpha-elements (Si, Ca and Ti) and sodium for the Mira variable V1 in the
metal-rich globular cluster NGC 5927. We use high-resolution (R~ 28,000), high
signal-to-noise ratio (~200) spectra collected with WINERED, a near-infrared
(NIR) spectrograph covering simultaneously the wavelength range 0.91--1.35
micron. The effective temperature and the surface gravity at the pulsation
phase of the spectroscopic observation were estimated using both optical (V)
and NIR time-series photometric data. We found that the Mira is metal-rich
([Fe/H]=-0.55 \pm 0.15) and moderately alpha-enhanced ([alpha/Fe]=0.15 \pm
0.01, sigma=0.2). These values agree quite well with the mean cluster
abundances based on high-resolution optical spectra of several cluster red
giants available in the literature ([Fe/H]=-0.47 \pm 0.06, [alpha/Fe]=+0.24 \pm
0.05). We also found a Na abundance of +0.35 \pm 0.20 that is higher than the
mean cluster abundance based on optical spectra (+0.18 \pm 0.13). However, the
lack of similar spectra for cluster red giants and that of corrections for
departures from local-thermodynamical equilibrium prevents us from establishing
whether the difference is intrinsic or connected with multiple populations.
These findings indicate a strong similarity between optical and NIR metallicity
scales in spite of the difference in the experimental equipment, data analysis
and in the adopted spectroscopic diagnostics.
| astro-ph.SR | we present the first spectroscopic abundance determination of iron alphaelements si ca and ti and sodium for the mira variable v1 in the metalrich globular cluster ngc 5927 we use highresolution r 28000 high signaltonoise ratio 200 spectra collected with winered a nearinfrared nir spectrograph covering simultaneously the wavelength range 091135 micron the effective temperature and the surface gravity at the pulsation phase of the spectroscopic observation were estimated using both optical v and nir timeseries photometric data we found that the mira is metalrich feh055 pm 015 and moderately alphaenhanced alphafe015 pm 001 sigma02 these values agree quite well with the mean cluster abundances based on highresolution optical spectra of several cluster red giants available in the literature feh047 pm 006 alphafe024 pm 005 we also found a na abundance of 035 pm 020 that is higher than the mean cluster abundance based on optical spectra 018 pm 013 however the lack of similar spectra for cluster red giants and that of corrections for departures from localthermodynamical equilibrium prevents us from establishing whether the difference is intrinsic or connected with multiple populations these findings indicate a strong similarity between optical and nir metallicity scales in spite of the difference in the experimental equipment data analysis and in the adopted spectroscopic diagnostics | [['we', 'present', 'the', 'first', 'spectroscopic', 'abundance', 'determination', 'of', 'iron', 'alphaelements', 'si', 'ca', 'and', 'ti', 'and', 'sodium', 'for', 'the', 'mira', 'variable', 'v1', 'in', 'the', 'metalrich', 'globular', 'cluster', 'ngc', '5927', 'we', 'use', 'highresolution', 'r', '28000', 'high', 'signaltonoise', 'ratio', '200', 'spectra', 'collected', 'with', 'winered', 'a', 'nearinfrared', 'nir', 'spectrograph', 'covering', 'simultaneously', 'the', 'wavelength', 'range', '091135', 'micron', 'the', 'effective', 'temperature', 'and', 'the', 'surface', 'gravity', 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1,802.07315 | A note concerning the modular valued von Neumann interaction operator | The modular valued operator $\widehat{V}_m$ of the von Neumann interaction
operator for a projector is defined. The properties of $\widehat{V}_m$ are
discussed and contrasted with those of the standard modular value of a
projector. The associated notion of a faux qubit is introduced and its possible
utility in quantum computation is noted. An experimental implementation of
$\widehat{V}_m$ is also highlighted.
| quant-ph | the modular valued operator widehatv_m of the von neumann interaction operator for a projector is defined the properties of widehatv_m are discussed and contrasted with those of the standard modular value of a projector the associated notion of a faux qubit is introduced and its possible utility in quantum computation is noted an experimental implementation of widehatv_m is also highlighted | [['the', 'modular', 'valued', 'operator', 'widehatv_m', 'of', 'the', 'von', 'neumann', 'interaction', 'operator', 'for', 'a', 'projector', 'is', 'defined', 'the', 'properties', 'of', 'widehatv_m', 'are', 'discussed', 'and', 'contrasted', 'with', 'those', 'of', 'the', 'standard', 'modular', 'value', 'of', 'a', 'projector', 'the', 'associated', 'notion', 'of', 'a', 'faux', 'qubit', 'is', 'introduced', 'and', 'its', 'possible', 'utility', 'in', 'quantum', 'computation', 'is', 'noted', 'an', 'experimental', 'implementation', 'of', 'widehatv_m', 'is', 'also', 'highlighted']] | [-0.15022006627017012, 0.10718231503293889, -0.06584929316304625, 0.04522218389902264, -0.05187048617129524, -0.1418905882164836, -0.044009664736222476, 0.32296683865521725, -0.27170447033519546, -0.18064791734019917, 0.11567928583632844, -0.2884611959413936, -0.14577586986124516, 0.2230870400244991, -0.08657364906539441, 0.11182515296677593, 0.07333575896530722, 0.12006306822877377, -0.12227332966964848, -0.2094103685580194, 0.37705244465420645, 0.07891167812631465, 0.22954694020639485, 0.06275928132236004, 0.08273150575502465, 0.010106851944389443, -0.040281025871324046, 0.00947222711207966, -0.08297700925419728, 0.14776008568393686, 0.2101556993564979, 0.13437953972412894, 0.276745365280658, -0.37516981263955435, -0.12532631745561956, 0.07250451526294152, 0.05497403466918816, 0.023323215078562498, -0.02310879238260289, -0.32719786760086816, 0.05228746203550448, -0.2124107786027404, -0.1560574853598761, -0.0628720093673716, 0.018269708333536982, -0.028369786605859797, -0.27822223616143066, 0.05270014251145767, 0.03376365412647526, 0.08759897605050355, -0.06487043898281021, -0.10826019727780173, -0.04177592060295865, 0.05259904158107626, -0.04180440966350337, 0.046651478740386665, 0.1178672319278121, -0.09597793493109445, -0.16115744756534695, 0.3719453940788905, -0.006989883406398197, -0.22680628864715496, 0.1268337073115011, -0.0758681477047503, -0.07281336294642339, 0.005174681241624057, 0.008803090701500574, 0.07969140700685481, -0.10328834362638493, 0.1658080295640199, -0.04758894257247448, 0.0993032429056863, 0.019007211201824248, 0.0818455661336581, 0.10059676577026645, 0.12434325554252913, 0.04713590741157532, 0.17510835632371405, -0.0006314374671395248, -0.14375962794777783, -0.32533390269769974, -0.23027848143440982, -0.23294968057113388, 0.03736288914612184, -0.05755469015130075, -0.19324468642783663, 0.4175109958741814, 0.11898981023890277, 0.17501494311727583, 0.048175647001092635, 0.23898696233906472, 0.20571841731046636, 0.08645292398675035, 0.018847822118550538, 0.19463776868457597, 0.2203794493339956, 0.05618385050135354, -0.23492883869136374, 0.04214337471251686, 0.09381052365448947] |
1,802.07316 | The search for radio emission from exoplanets using LOFAR beam-formed
observations: Jupiter as an exoplanet | $\textit{Context.}$ The magnetized Solar System planets are strong radio
emitters and theoretical studies suggest that the radio emission from nearby
exoplanets in close-in orbits could reach intensity levels $10^{3}-10^{7}$
times higher than Jupiter's decametric emission. Detection of exoplanets in the
radio domain would open up a brand new field of research, however, currently
there are no confirmed detections at radio frequencies.
$\textit{Aims.}$ We investigate the radio emission from Jupiter, scaled such
that it mimics emission coming from an exoplanet, with low-frequency
beam-formed observations using LOFAR. The goals are to define a set of
observables that can be used as a guideline in the search for exoplanetary
radio emission and to measure effectively the sensitivity limit for LOFAR
beam-formed observations.
$\textit{Methods.}$ We observe "Jupiter as an exoplanet" by dividing a LOFAR
observation of Jupiter by a down-scaling factor and adding this observation to
beam-formed data of the "sky background". Then we run this artificial dataset
through our total intensity (Stokes-I) and circular polarization (Stokes-V)
processing and post-processing pipelines and determine up to which down-scaling
factor Jupiter is still detected in the dataset.
$\textit{Results.}$ We find that exoplanetary radio bursts can be detected at
5 pc if the circularly polarized flux is $10^5$ times stronger than the typical
level of Jupiter's radio bursts during active emission events
($\sim4\times10^{5}$ Jy). Equivalently, circularly polarized radio bursts can
be detected up to a distance of 20 pc (encompassing the known exoplanets 55
Cnc, Tau Bo\"{o}tis, and Upsilon Andromedae) assuming the level of emission is
$10^{5}$ times stronger than the peak flux of Jupiter's decametric burst
emission ($\sim6\times10^{6}$ Jy).
| astro-ph.EP astro-ph.IM | textitcontext the magnetized solar system planets are strong radio emitters and theoretical studies suggest that the radio emission from nearby exoplanets in closein orbits could reach intensity levels 103107 times higher than jupiters decametric emission detection of exoplanets in the radio domain would open up a brand new field of research however currently there are no confirmed detections at radio frequencies textitaims we investigate the radio emission from jupiter scaled such that it mimics emission coming from an exoplanet with lowfrequency beamformed observations using lofar the goals are to define a set of observables that can be used as a guideline in the search for exoplanetary radio emission and to measure effectively the sensitivity limit for lofar beamformed observations textitmethods we observe jupiter as an exoplanet by dividing a lofar observation of jupiter by a downscaling factor and adding this observation to beamformed data of the sky background then we run this artificial dataset through our total intensity stokesi and circular polarization stokesv processing and postprocessing pipelines and determine up to which downscaling factor jupiter is still detected in the dataset textitresults we find that exoplanetary radio bursts can be detected at 5 pc if the circularly polarized flux is 105 times stronger than the typical level of jupiters radio bursts during active emission events sim4times105 jy equivalently circularly polarized radio bursts can be detected up to a distance of 20 pc encompassing the known exoplanets 55 cnc tau bootis and upsilon andromedae assuming the level of emission is 105 times stronger than the peak flux of jupiters decametric burst emission sim6times106 jy | [['textitcontext', 'the', 'magnetized', 'solar', 'system', 'planets', 'are', 'strong', 'radio', 'emitters', 'and', 'theoretical', 'studies', 'suggest', 'that', 'the', 'radio', 'emission', 'from', 'nearby', 'exoplanets', 'in', 'closein', 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1,802.07317 | Transport through a network of topological states in twisted bilayer
graphene | We explore a network of electronic quantum valley Hall (QVH) states in the
moir\'e crystal of minimally twisted bilayer graphene. In our transport
measurements we observe Fabry-P\'erot and Aharanov-Bohm oscillations which are
robust in magnetic fields ranging from 0 to 8T, in strong contrast to more
conventional 2D systems where trajectories in the bulk are bent by the Lorentz
force. This persistence in magnetic field and the linear spacing in density
indicate that charge carriers in the bulk flow in topologically protected, one
dimensional channels. With this work we demonstrate coherent electronic
transport in a lattice of topologically protected states.
| cond-mat.mes-hall quant-ph | we explore a network of electronic quantum valley hall qvh states in the moire crystal of minimally twisted bilayer graphene in our transport measurements we observe fabryperot and aharanovbohm oscillations which are robust in magnetic fields ranging from 0 to 8t in strong contrast to more conventional 2d systems where trajectories in the bulk are bent by the lorentz force this persistence in magnetic field and the linear spacing in density indicate that charge carriers in the bulk flow in topologically protected one dimensional channels with this work we demonstrate coherent electronic transport in a lattice of topologically protected states | [['we', 'explore', 'a', 'network', 'of', 'electronic', 'quantum', 'valley', 'hall', 'qvh', 'states', 'in', 'the', 'moire', 'crystal', 'of', 'minimally', 'twisted', 'bilayer', 'graphene', 'in', 'our', 'transport', 'measurements', 'we', 'observe', 'fabryperot', 'and', 'aharanovbohm', 'oscillations', 'which', 'are', 'robust', 'in', 'magnetic', 'fields', 'ranging', 'from', '0', 'to', '8t', 'in', 'strong', 'contrast', 'to', 'more', 'conventional', '2d', 'systems', 'where', 'trajectories', 'in', 'the', 'bulk', 'are', 'bent', 'by', 'the', 'lorentz', 'force', 'this', 'persistence', 'in', 'magnetic', 'field', 'and', 'the', 'linear', 'spacing', 'in', 'density', 'indicate', 'that', 'charge', 'carriers', 'in', 'the', 'bulk', 'flow', 'in', 'topologically', 'protected', 'one', 'dimensional', 'channels', 'with', 'this', 'work', 'we', 'demonstrate', 'coherent', 'electronic', 'transport', 'in', 'a', 'lattice', 'of', 'topologically', 'protected', 'states']] | [-0.233261025500251, 0.2614346362370998, -0.04352290155016817, -0.011288707584608346, 0.016291365628130734, -0.15700658614747226, 0.03761244219727814, 0.38645771803800016, -0.2947556338692084, -0.2625028226338327, -0.014198767354246229, -0.28600359819829463, -0.1798291512299329, 0.17940028635319322, -0.02489354743156582, 0.047119633262045685, -0.02053907441906631, -0.04794184634461999, -0.07324698275187984, -0.16611683517927303, 0.29675012435764075, -0.042921950408490374, 0.3388658618181944, 0.043886881321668625, 0.0004729840601794422, 0.002892638158518821, 0.08423081878107042, 0.05389231253298931, -0.13822451731823093, 0.07147426283336245, 0.2371104849735275, -0.15238734549377114, 0.17822357994038612, -0.5150820869207382, -0.21646855604834855, -0.013208131542705814, 0.11957470963738161, 0.1967976500687655, -0.0857345230349165, -0.30166006796061995, 0.06850297504337505, -0.13467075543478133, -0.08975514516001568, -0.09230069017969073, -0.026257575777126476, -0.04773870952427387, -0.22089639270678163, 0.13002271649893374, -0.00796070128097199, 0.09610097906086594, -0.08063845885917545, -0.06584318215725943, -0.11685042730998248, 0.07637990930350497, 0.029550132967124228, 0.045689340820536016, 0.17172973949927836, -0.18198528119108232, -0.1764515083213337, 0.3666519302688539, -0.06417759319767356, -0.17168855489231646, 0.18026107829529792, -0.24126583438832314, -0.08356703873956577, 0.13576773807406425, 0.14819749423244502, 0.08256926525849849, -0.09668595349416137, 0.06713365090894513, -0.06494889589608648, 0.1451755660586059, 0.04960567409172654, 0.13256196127389558, 0.261964434273541, 0.1331190128903836, 0.08322860204614699, 0.1509248197125271, -0.12100502737797797, -0.061759792952798306, -0.22151949317194522, -0.20826090165413916, -0.21454062616918235, 0.10935253062751144, -0.013041272298141848, -0.2114414306776598, 0.45628860203083604, 0.15694391508761327, 0.16387643644586206, -0.06834406658657827, 0.24871038746088744, 0.06623266769107432, 0.10024038530420512, 0.07720188780687749, 0.26966074891621244, 0.1699874871247448, 0.09753406771458685, -0.27863953918917106, -0.06632332515669986, -0.019549409139435737] |
1,802.07318 | High-temperature structural phase transition and infrared dielectric
features of La2CoMnO6 | Temperature-dependent FAR-infrared reflectivity spectra of partially ordered
magnetodielectric La2CoMnO6 is presented, from room temperature up to 675 K. A
clear first-ordered structural phase transition (SPT) from a monoclinic
structure with P2_1/n symmetry to a rhombohedral phase with R-3 symmetry was
evidenced from the behaviour of polar phonon modes at TC~590 K. The temperature
dependences of the transversal and longitudinal phonon branches, dielectric
strengths, and damping of the strongest dielectric modes confirm the
significant contribution of the phonon modes on the SPT, and revealed an
important lattice anharmonicity, particularly for the low frequency modes. In
addition, these investigations showed that structural ordering does not inhibit
the SPT, and provided valuable information towards the polar phonons, their
implications on intrinsic dielectric constant in double perovskites and in
related compounds.
| cond-mat.mtrl-sci | temperaturedependent farinfrared reflectivity spectra of partially ordered magnetodielectric la2comno6 is presented from room temperature up to 675 k a clear firstordered structural phase transition spt from a monoclinic structure with p2_1n symmetry to a rhombohedral phase with r3 symmetry was evidenced from the behaviour of polar phonon modes at tc590 k the temperature dependences of the transversal and longitudinal phonon branches dielectric strengths and damping of the strongest dielectric modes confirm the significant contribution of the phonon modes on the spt and revealed an important lattice anharmonicity particularly for the low frequency modes in addition these investigations showed that structural ordering does not inhibit the spt and provided valuable information towards the polar phonons their implications on intrinsic dielectric constant in double perovskites and in related compounds | [['temperaturedependent', 'farinfrared', 'reflectivity', 'spectra', 'of', 'partially', 'ordered', 'magnetodielectric', 'la2comno6', 'is', 'presented', 'from', 'room', 'temperature', 'up', 'to', '675', 'k', 'a', 'clear', 'firstordered', 'structural', 'phase', 'transition', 'spt', 'from', 'a', 'monoclinic', 'structure', 'with', 'p2_1n', 'symmetry', 'to', 'a', 'rhombohedral', 'phase', 'with', 'r3', 'symmetry', 'was', 'evidenced', 'from', 'the', 'behaviour', 'of', 'polar', 'phonon', 'modes', 'at', 'tc590', 'k', 'the', 'temperature', 'dependences', 'of', 'the', 'transversal', 'and', 'longitudinal', 'phonon', 'branches', 'dielectric', 'strengths', 'and', 'damping', 'of', 'the', 'strongest', 'dielectric', 'modes', 'confirm', 'the', 'significant', 'contribution', 'of', 'the', 'phonon', 'modes', 'on', 'the', 'spt', 'and', 'revealed', 'an', 'important', 'lattice', 'anharmonicity', 'particularly', 'for', 'the', 'low', 'frequency', 'modes', 'in', 'addition', 'these', 'investigations', 'showed', 'that', 'structural', 'ordering', 'does', 'not', 'inhibit', 'the', 'spt', 'and', 'provided', 'valuable', 'information', 'towards', 'the', 'polar', 'phonons', 'their', 'implications', 'on', 'intrinsic', 'dielectric', 'constant', 'in', 'double', 'perovskites', 'and', 'in', 'related', 'compounds']] | [-0.16869996663271672, 0.24292620584206556, -0.06039806335262718, -0.03210944689289179, -0.09662293362808191, -0.11404890023423211, 0.11633107299724268, 0.4286339452105855, -0.24298481125590607, -0.22006704343394154, 0.019231274350276512, -0.33227647958131185, -0.1539577964678525, 0.16805169752444185, 0.08661293155667711, 0.007608634107450526, -0.06328553073699512, -0.016701868937594726, -0.07985366719575333, -0.16013771592129378, 0.22042099396062512, 0.06824319511060677, 0.3381718930655292, 0.10418196798982246, 0.035603273015040605, -0.01878206616467131, 0.0664104534283517, 0.018942394929509315, -0.17150352341853986, 0.009721166630062351, 0.2812609023983694, -0.10794880334287882, 0.1452576688450155, -0.38193503816774677, -0.22259842880099776, -0.01194788246703822, 0.1205340268604073, 0.13366017589670798, -0.04464694270161942, -0.26531726800437483, 0.010737581148980156, -0.05289819501044731, -0.11855634922043436, -0.113128774296788, -0.019249154136530937, -0.05382055828037361, -0.2113989903245099, 0.1266582264890155, 0.08163989693783814, 0.1561409694526995, -0.14758651736857636, -0.19622749892675082, -0.12164808265746586, 0.07293805255303307, 0.07833849551296601, 0.0434449336681855, 0.12233349703998851, -0.05946905730247852, -0.08540318265468591, 0.40581328378036796, -0.05860122279744477, -0.017839131662474264, 0.18518541441629904, -0.22194012420045006, -0.10707448474648926, 0.2311346869738329, 0.11951935632775228, 0.04801450424554152, -0.09397700024234677, 0.07079030744457018, 0.05774605041277402, 0.24157515533697155, 0.08645840424356893, 0.12093265195347605, 0.26143909094943885, 0.1132416462207893, 0.010632426241442325, 0.17495258344339193, -0.0812258771925588, 0.012765023221690503, -0.23444277679340708, -0.12703335847860822, -0.19233102922786086, 0.024925300999524235, -0.11761905807419218, -0.19643926154729718, 0.3907405928679047, 0.07473433458659519, 0.1666048173903532, -0.03262498744186901, 0.23877404246013612, 0.041848975732194496, 0.10218543984136352, 0.031081833324158595, 0.2886982572944983, 0.2302234896369988, 0.125647332061023, -0.3515399096308217, 0.04514405501466836, -0.02574095887867438] |
1,802.07319 | The Updated BaSTI Stellar Evolution Models and Isochrones: I. Solar
Scaled Calculations | We present an updated release of the BaSTI (a Bag of Stellar Tracks and
Isochrones) stellar model and isochrone library for a solar scaled heavy
element distribution. The main input physics changed from the previous BaSTI
release include the solar metal mixture, electron conduction opacities, a few
nuclear reaction rates, bolometric corrections, and the treatment of the
overshooting efficiency for shrinking convective cores. The new model
calculations cover a mass range between 0.1 and 15 Msun, 22 initial chemical
compositions between [Fe/H]=-3.20 and +0.45, with helium to metal enrichment
ratio dY /dZ=1.31. The isochrones cover an age range between 20 Myr and 14.5
Gyr, take consistently into account the pre-main sequence phase, and have been
translated to a large number of popular photometric systems. Asteroseismic
properties of the theoretical models have also been calculated. We compare our
isochrones with results from independent databases and with several sets of
observations, to test the accuracy of the calculations. All stellar evolution
tracks, asteroseismic properties and isochrones are made available through a
dedicated Web site.
| astro-ph.GA astro-ph.SR | we present an updated release of the basti a bag of stellar tracks and isochrones stellar model and isochrone library for a solar scaled heavy element distribution the main input physics changed from the previous basti release include the solar metal mixture electron conduction opacities a few nuclear reaction rates bolometric corrections and the treatment of the overshooting efficiency for shrinking convective cores the new model calculations cover a mass range between 01 and 15 msun 22 initial chemical compositions between feh320 and 045 with helium to metal enrichment ratio dy dz131 the isochrones cover an age range between 20 myr and 145 gyr take consistently into account the premain sequence phase and have been translated to a large number of popular photometric systems asteroseismic properties of the theoretical models have also been calculated we compare our isochrones with results from independent databases and with several sets of observations to test the accuracy of the calculations all stellar evolution tracks asteroseismic properties and isochrones are made available through a dedicated web site | [['we', 'present', 'an', 'updated', 'release', 'of', 'the', 'basti', 'a', 'bag', 'of', 'stellar', 'tracks', 'and', 'isochrones', 'stellar', 'model', 'and', 'isochrone', 'library', 'for', 'a', 'solar', 'scaled', 'heavy', 'element', 'distribution', 'the', 'main', 'input', 'physics', 'changed', 'from', 'the', 'previous', 'basti', 'release', 'include', 'the', 'solar', 'metal', 'mixture', 'electron', 'conduction', 'opacities', 'a', 'few', 'nuclear', 'reaction', 'rates', 'bolometric', 'corrections', 'and', 'the', 'treatment', 'of', 'the', 'overshooting', 'efficiency', 'for', 'shrinking', 'convective', 'cores', 'the', 'new', 'model', 'calculations', 'cover', 'a', 'mass', 'range', 'between', '01', 'and', '15', 'msun', '22', 'initial', 'chemical', 'compositions', 'between', 'feh320', 'and', '045', 'with', 'helium', 'to', 'metal', 'enrichment', 'ratio', 'dy', 'dz131', 'the', 'isochrones', 'cover', 'an', 'age', 'range', 'between', '20', 'myr', 'and', '145', 'gyr', 'take', 'consistently', 'into', 'account', 'the', 'premain', 'sequence', 'phase', 'and', 'have', 'been', 'translated', 'to', 'a', 'large', 'number', 'of', 'popular', 'photometric', 'systems', 'asteroseismic', 'properties', 'of', 'the', 'theoretical', 'models', 'have', 'also', 'been', 'calculated', 'we', 'compare', 'our', 'isochrones', 'with', 'results', 'from', 'independent', 'databases', 'and', 'with', 'several', 'sets', 'of', 'observations', 'to', 'test', 'the', 'accuracy', 'of', 'the', 'calculations', 'all', 'stellar', 'evolution', 'tracks', 'asteroseismic', 'properties', 'and', 'isochrones', 'are', 'made', 'available', 'through', 'a', 'dedicated', 'web', 'site']] | [0.02371685857720235, 0.15547381966967164, -0.06175112877304748, 0.0915393615990658, -0.053931902658523004, -0.06222437384593136, 0.11403401329058825, 0.4298320760402609, -0.19802628296482214, -0.43755951738258936, 0.018453417165095316, -0.3053909831392743, 0.05577032594284152, 0.2098879065775477, -0.03500134800286854, 0.04058094974127872, 0.16976952198208037, -0.08250553925822982, -0.07472686857971199, -0.26672362020677504, 0.2621060912606909, 0.023491710438119137, 0.15279650816913037, -0.005891471701290678, 0.03709100329262369, -0.1336751978378743, -0.06719570109785042, -0.062095100772293174, -0.22233535861810463, 0.05435661497142385, 0.21122290318215914, 0.13874567207663752, 0.2018343842218575, -0.36864016527200444, -0.2315775534918751, 0.023757671162157375, 0.15053110244574355, 0.0663686625111629, -0.11414525087046272, -0.2097484793034656, 0.050642413856899916, -0.24259294519570712, -0.09726498959421673, 0.015136518707389341, 0.040474044468582555, 0.06694780367988107, -0.2817075347089592, 0.05310002876127221, -0.022202680736561033, 0.13578055405857467, -0.14842293436419876, -0.2502528606201796, -0.10030577568844927, 0.16532358771244832, 0.0060968353563700525, 0.06940986162739779, 0.13402388303622823, -0.07686199543668944, -0.003064730280654176, 0.39286561659263336, -0.09497819365796578, -0.04882521878325326, 0.19822392012266551, -0.13155705434927606, -0.14438739733167869, 0.10598483843564549, 0.1758752827099456, 0.10930705524378401, -0.21061635311583385, 0.039281932921628196, 0.03765776201616973, 0.24054589983185423, 0.013089497254558784, -0.020606192434206604, 0.291703546036254, 0.1943845895173795, -0.06373512225143392, 0.034818286203560145, -0.18474147398545243, -0.11274214430493029, -0.22959259871174306, -0.08597860275767744, -0.08632861977881369, 0.03715445090989199, -0.18507085000087767, -0.17728671908433385, 0.3563399818725884, 0.16746333206127234, 0.21756114185349468, 0.06134398932267419, 0.2883948548970854, 0.04400907675804132, 0.10235877316445112, 0.09141094304949922, 0.23962831976001753, 0.22917344701722064, 0.12116661328918246, -0.24559344379334053, 0.08261368636534933, 0.046428006854565704] |
1,802.0732 | Degrees of extensionality in the theory of B\"ohm trees and Sall\'e's
conjecture | The main observational equivalences of the untyped lambda-calculus have been
characterized in terms of extensional equalities between B\"ohm trees. It is
well known that the lambda-theory H*, arising by taking as observables the head
normal forms, equates two lambda-terms whenever their B\"ohm trees are equal up
to countably many possibly infinite eta-expansions. Similarly, two lambda-terms
are equal in Morris's original observational theory H+, generated by
considering as observable the beta-normal forms, whenever their B\"ohm trees
are equal up to countably many finite eta-expansions.
The lambda-calculus also possesses a strong notion of extensionality called
"the omega-rule", which has been the subject of many investigations. It is a
longstanding open problem whether the equivalence B-omega obtained by closing
the theory of B\"ohm trees under the omega-rule is strictly included in H+, as
conjectured by Sall\'e in the seventies. In this paper we demonstrate that the
two aforementioned theories actually coincide, thus disproving Sall\'e's
conjecture.
The proof technique we develop for proving the latter inclusion is general
enough to provide as a byproduct a new characterization, based on bounded
eta-expansions, of the least extensional equality between B\"ohm trees.
Together, these results provide a taxonomy of the different degrees of
extensionality in the theory of B\"ohm trees.
| cs.LO | the main observational equivalences of the untyped lambdacalculus have been characterized in terms of extensional equalities between bohm trees it is well known that the lambdatheory h arising by taking as observables the head normal forms equates two lambdaterms whenever their bohm trees are equal up to countably many possibly infinite etaexpansions similarly two lambdaterms are equal in morriss original observational theory h generated by considering as observable the betanormal forms whenever their bohm trees are equal up to countably many finite etaexpansions the lambdacalculus also possesses a strong notion of extensionality called the omegarule which has been the subject of many investigations it is a longstanding open problem whether the equivalence bomega obtained by closing the theory of bohm trees under the omegarule is strictly included in h as conjectured by salle in the seventies in this paper we demonstrate that the two aforementioned theories actually coincide thus disproving salles conjecture the proof technique we develop for proving the latter inclusion is general enough to provide as a byproduct a new characterization based on bounded etaexpansions of the least extensional equality between bohm trees together these results provide a taxonomy of the different degrees of extensionality in the theory of bohm trees | [['the', 'main', 'observational', 'equivalences', 'of', 'the', 'untyped', 'lambdacalculus', 'have', 'been', 'characterized', 'in', 'terms', 'of', 'extensional', 'equalities', 'between', 'bohm', 'trees', 'it', 'is', 'well', 'known', 'that', 'the', 'lambdatheory', 'h', 'arising', 'by', 'taking', 'as', 'observables', 'the', 'head', 'normal', 'forms', 'equates', 'two', 'lambdaterms', 'whenever', 'their', 'bohm', 'trees', 'are', 'equal', 'up', 'to', 'countably', 'many', 'possibly', 'infinite', 'etaexpansions', 'similarly', 'two', 'lambdaterms', 'are', 'equal', 'in', 'morriss', 'original', 'observational', 'theory', 'h', 'generated', 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1,802.07321 | Robustness in Consensus Networks | We consider the problem of robustness in large consensus networks that occur
in many areas such as distributed optimization. Robustness, in this context, is
the scaling of performance measures, e.g. H2-norm, as a function of network
dimension. We provide a formal framework to quantify the relation between such
performance scaling and the convergence speed of the network. Specifically, we
provide upper and lower bounds for the convergence speed in terms of robustness
and discuss how these bounds scale with the network topology. The main
contribution of this work is that we obtain tight bounds, that hold regardless
of network topology. The work here also encompasses some results in convergence
time analysis in previous literature.
| cs.SY | we consider the problem of robustness in large consensus networks that occur in many areas such as distributed optimization robustness in this context is the scaling of performance measures eg h2norm as a function of network dimension we provide a formal framework to quantify the relation between such performance scaling and the convergence speed of the network specifically we provide upper and lower bounds for the convergence speed in terms of robustness and discuss how these bounds scale with the network topology the main contribution of this work is that we obtain tight bounds that hold regardless of network topology the work here also encompasses some results in convergence time analysis in previous literature | [['we', 'consider', 'the', 'problem', 'of', 'robustness', 'in', 'large', 'consensus', 'networks', 'that', 'occur', 'in', 'many', 'areas', 'such', 'as', 'distributed', 'optimization', 'robustness', 'in', 'this', 'context', 'is', 'the', 'scaling', 'of', 'performance', 'measures', 'eg', 'h2norm', 'as', 'a', 'function', 'of', 'network', 'dimension', 'we', 'provide', 'a', 'formal', 'framework', 'to', 'quantify', 'the', 'relation', 'between', 'such', 'performance', 'scaling', 'and', 'the', 'convergence', 'speed', 'of', 'the', 'network', 'specifically', 'we', 'provide', 'upper', 'and', 'lower', 'bounds', 'for', 'the', 'convergence', 'speed', 'in', 'terms', 'of', 'robustness', 'and', 'discuss', 'how', 'these', 'bounds', 'scale', 'with', 'the', 'network', 'topology', 'the', 'main', 'contribution', 'of', 'this', 'work', 'is', 'that', 'we', 'obtain', 'tight', 'bounds', 'that', 'hold', 'regardless', 'of', 'network', 'topology', 'the', 'work', 'here', 'also', 'encompasses', 'some', 'results', 'in', 'convergence', 'time', 'analysis', 'in', 'previous', 'literature']] | [-0.12953256108193545, 0.016994076654347674, -0.06439257845723707, 0.0839227338305168, -0.0240468734654745, -0.08260576568519402, 0.07535342913807223, 0.3661611486438727, -0.26523861442610885, -0.3282708061385181, 0.13079785315622167, -0.2211195223294852, -0.22106895528799086, 0.22041664262743374, -0.11313497996072105, 0.08132852602182283, 0.05196941492817642, 0.03623884210103649, -0.07783902737336527, -0.26597468277414965, 0.3217794660472703, 0.061008691117821034, 0.32201416510680136, 0.11000586320695124, 0.03482675544198668, -0.0578093051608129, 0.0021171342569256298, 0.04165766846895087, -0.1655829460247141, 0.14188157445077146, 0.23673214889008945, 0.18415550153759683, 0.30183426761313487, -0.41439468717496647, -0.19949889906657567, 0.13017856583750823, 0.15398211411459334, 0.08246081892662403, -0.04311563090110818, -0.23706988833452525, 0.10807566847366265, -0.15915897830078998, -0.09905222813974608, -0.10070150001628096, -0.006672791372821258, 0.07426848839723359, -0.23957468856844985, 0.08125570258549455, 0.11812199370347355, 0.04232464844474299, -0.04601126665907111, -0.08113571035414281, 0.0463613150181788, 0.18077674106461927, 0.07767772192458149, 0.02031341127708162, 0.09289019280358364, -0.13565108311574972, -0.1367209676740969, 0.34133859107417885, -0.07958426245839514, -0.23365303697069625, 0.1901705640173117, -0.12093389434576557, -0.1988382657352639, 0.03700623537103335, 0.2613044635948251, 0.07921083333387383, -0.1208476217488121, 0.09763198220344636, -0.06639787656042659, 0.13150636791333295, 0.0372006461890251, 0.12931216414609367, 0.07376146590410683, 0.23231090616696237, 0.1490252053221124, 0.16895528768981694, -0.0789287720251371, -0.11373878868394777, -0.3026748391832307, -0.15432844332239606, -0.17401213748707323, -0.004855914926769114, -0.16325410765867882, -0.13964686896182238, 0.4076539340445347, 0.22455483862492992, 0.2323339921258913, 0.16569215657287523, 0.31515385132086904, 0.10729057418760485, 0.011748165607027579, 0.12449362381818917, 0.26589658455805765, 0.11773974957606315, 0.09147667361978899, -0.1821395618097628, 0.09749777762121276, 0.06682316860870312] |
1,802.07322 | Broyden's method for nonlinear eigenproblems | Broyden's method is a general method commonly used for nonlinear systems of
equations, when very little information is available about the problem. We
develop an approach based on Broyden's method for nonlinear eigenvalue
problems. Our approach is designed for problems where the evaluation of a
matrix vector product is computationally expensive, essentially as expensive as
solving the corresponding linear system of equations. We show how the structure
of the Jacobian matrix can be incorporated into the algorithm to improve
convergence. The algorithm exhibits local superlinear convergence for simple
eigenvalues, and we characterize the convergence. We show how deflation can be
integrated and combined such that the method can be used to compute several
eigenvalues. A specific problem in machine tool milling, coupled with a PDE is
used to illustrate the approach. The simulations are done in the julia
programming language, and are provided as publicly available module for
reproducability.
| math.NA | broydens method is a general method commonly used for nonlinear systems of equations when very little information is available about the problem we develop an approach based on broydens method for nonlinear eigenvalue problems our approach is designed for problems where the evaluation of a matrix vector product is computationally expensive essentially as expensive as solving the corresponding linear system of equations we show how the structure of the jacobian matrix can be incorporated into the algorithm to improve convergence the algorithm exhibits local superlinear convergence for simple eigenvalues and we characterize the convergence we show how deflation can be integrated and combined such that the method can be used to compute several eigenvalues a specific problem in machine tool milling coupled with a pde is used to illustrate the approach the simulations are done in the julia programming language and are provided as publicly available module for reproducability | [['broydens', 'method', 'is', 'a', 'general', 'method', 'commonly', 'used', 'for', 'nonlinear', 'systems', 'of', 'equations', 'when', 'very', 'little', 'information', 'is', 'available', 'about', 'the', 'problem', 'we', 'develop', 'an', 'approach', 'based', 'on', 'broydens', 'method', 'for', 'nonlinear', 'eigenvalue', 'problems', 'our', 'approach', 'is', 'designed', 'for', 'problems', 'where', 'the', 'evaluation', 'of', 'a', 'matrix', 'vector', 'product', 'is', 'computationally', 'expensive', 'essentially', 'as', 'expensive', 'as', 'solving', 'the', 'corresponding', 'linear', 'system', 'of', 'equations', 'we', 'show', 'how', 'the', 'structure', 'of', 'the', 'jacobian', 'matrix', 'can', 'be', 'incorporated', 'into', 'the', 'algorithm', 'to', 'improve', 'convergence', 'the', 'algorithm', 'exhibits', 'local', 'superlinear', 'convergence', 'for', 'simple', 'eigenvalues', 'and', 'we', 'characterize', 'the', 'convergence', 'we', 'show', 'how', 'deflation', 'can', 'be', 'integrated', 'and', 'combined', 'such', 'that', 'the', 'method', 'can', 'be', 'used', 'to', 'compute', 'several', 'eigenvalues', 'a', 'specific', 'problem', 'in', 'machine', 'tool', 'milling', 'coupled', 'with', 'a', 'pde', 'is', 'used', 'to', 'illustrate', 'the', 'approach', 'the', 'simulations', 'are', 'done', 'in', 'the', 'julia', 'programming', 'language', 'and', 'are', 'provided', 'as', 'publicly', 'available', 'module', 'for', 'reproducability']] | [-0.03682033499490295, -0.01823215344410949, -0.1152792510259334, 0.09270802081559454, -0.10528591027070812, -0.16333888631764074, -0.0333475798740358, 0.3891951297753609, -0.31674345085184846, -0.2832428327567825, 0.16204984332809863, -0.2527049424176748, -0.20412770822494222, 0.2595049235844772, -0.04740026592895789, 0.1346102312157218, 0.12194961530075177, 0.028148896868759453, -0.07349728233956, -0.26348448931489565, 0.29113404933463205, 0.025988205367286733, 0.26029852244865476, 0.05614273071339066, 0.1308732041682823, -0.03501188583928316, 0.006125646630839613, 0.04112517986221601, -0.08902551150505139, 0.1445996712701045, 0.2857336209611905, 0.18106317549831416, 0.30979117421252067, -0.4237234849520278, -0.15086612111620054, 0.091960364318259, 0.1780314161285958, 0.12193162623017827, -0.024297262350528582, -0.24655742221980687, 0.11322789214982733, -0.1439512816051509, -0.11347567986996981, -0.15839629713445902, -0.060885128783899664, 0.007600984036072389, -0.33194057774478447, 0.06048995146415378, 0.01919793841997849, 0.03707343051147541, -0.03157000433366071, -0.11854413644748196, 0.027659636154933363, 0.10247464081129502, 0.0014809376807045816, -0.0026409835914062373, 0.1025788271401215, -0.06049974229118018, -0.10939343707423482, 0.40797230651314625, -0.07554592507822602, -0.28452933075112735, 0.1620164326338985, -0.032707340746567955, -0.13007424829133954, 0.1071127813384437, 0.235728240865689, 0.17523752266991158, -0.1582723331362073, 0.1044461446733764, -0.023878393788515723, 0.17633567567314679, -0.002950749002770527, -0.049192577882923014, 0.09952537971704999, 0.2039028092353111, 0.09321160992371519, 0.16363884428369144, -0.012233406794413725, -0.08219089309041132, -0.25748483668512745, -0.1443811316268156, -0.2266902340788569, 0.0070436060547378635, -0.10111480228723599, -0.1700354829905617, 0.3842152200589244, 0.1876513166760365, 0.15515276552459237, 0.0665191293329988, 0.3159086844796352, 0.1802915057633072, 0.06895300369684729, 0.10629071982814961, 0.18666207452848455, 0.128465543538582, 0.09545870672055089, -0.22947802207699897, 0.06447935875836484, 0.11960110701495569] |
1,802.07323 | Parametric amplification and squeezing with an ac- and dc-voltage biased
superconducting junction | We theoretically investigate a near-quantum-limited parametric amplifier
based on the nonlinear dynamics of quasiparticles flowing through a
superconducting-insulator-superconducting junction. Photon-assisted tunneling,
resulting from the combination of dc- and ac-voltage bias, gives rise to a
strong parametric interaction for the electromagnetic modes reflected by the
junction coupled to a transmission line. We show phase-sensitive and
phase-preserving amplification, together with single- and two-mode squeezing.
For an aluminum junction pumped at twice the center frequency,
$\omega_0/2\pi=6$~GHz, we predict narrow-band phase-sensitive amplification of
microwaves signals to more than 20 dB, and broadband phase-preserving
amplification of 20 dB over a 1.2 GHz 3-dB bandwidth. We also predict single-
and two-mode squeezing reaching more than -12 dB over 5.3 GHz 3-dB bandwidth.
Moreover, with a simple impedance matching circuit, we demonstrate 3 dB
bandwidth reaching 4.3 GHz for 20 dB of gain. A key feature of the device is
that its performance can be controlled in-situ with the applied dc- and
ac-voltage biases.
| cond-mat.mes-hall | we theoretically investigate a nearquantumlimited parametric amplifier based on the nonlinear dynamics of quasiparticles flowing through a superconductinginsulatorsuperconducting junction photonassisted tunneling resulting from the combination of dc and acvoltage bias gives rise to a strong parametric interaction for the electromagnetic modes reflected by the junction coupled to a transmission line we show phasesensitive and phasepreserving amplification together with single and twomode squeezing for an aluminum junction pumped at twice the center frequency omega_02pi6ghz we predict narrowband phasesensitive amplification of microwaves signals to more than 20 db and broadband phasepreserving amplification of 20 db over a 12 ghz 3db bandwidth we also predict single and twomode squeezing reaching more than 12 db over 53 ghz 3db bandwidth moreover with a simple impedance matching circuit we demonstrate 3 db bandwidth reaching 43 ghz for 20 db of gain a key feature of the device is that its performance can be controlled insitu with the applied dc and acvoltage biases | [['we', 'theoretically', 'investigate', 'a', 'nearquantumlimited', 'parametric', 'amplifier', 'based', 'on', 'the', 'nonlinear', 'dynamics', 'of', 'quasiparticles', 'flowing', 'through', 'a', 'superconductinginsulatorsuperconducting', 'junction', 'photonassisted', 'tunneling', 'resulting', 'from', 'the', 'combination', 'of', 'dc', 'and', 'acvoltage', 'bias', 'gives', 'rise', 'to', 'a', 'strong', 'parametric', 'interaction', 'for', 'the', 'electromagnetic', 'modes', 'reflected', 'by', 'the', 'junction', 'coupled', 'to', 'a', 'transmission', 'line', 'we', 'show', 'phasesensitive', 'and', 'phasepreserving', 'amplification', 'together', 'with', 'single', 'and', 'twomode', 'squeezing', 'for', 'an', 'aluminum', 'junction', 'pumped', 'at', 'twice', 'the', 'center', 'frequency', 'omega_02pi6ghz', 'we', 'predict', 'narrowband', 'phasesensitive', 'amplification', 'of', 'microwaves', 'signals', 'to', 'more', 'than', '20', 'db', 'and', 'broadband', 'phasepreserving', 'amplification', 'of', '20', 'db', 'over', 'a', '12', 'ghz', '3db', 'bandwidth', 'we', 'also', 'predict', 'single', 'and', 'twomode', 'squeezing', 'reaching', 'more', 'than', '12', 'db', 'over', '53', 'ghz', '3db', 'bandwidth', 'moreover', 'with', 'a', 'simple', 'impedance', 'matching', 'circuit', 'we', 'demonstrate', '3', 'db', 'bandwidth', 'reaching', '43', 'ghz', 'for', '20', 'db', 'of', 'gain', 'a', 'key', 'feature', 'of', 'the', 'device', 'is', 'that', 'its', 'performance', 'can', 'be', 'controlled', 'insitu', 'with', 'the', 'applied', 'dc', 'and', 'acvoltage', 'biases']] | [-0.16692861379462204, 0.11151422717723049, 0.008111161758161841, -0.04194612979753724, -0.03821455583336853, -0.2146179753490874, 0.15251494061442153, 0.44185082416741117, -0.22595576311671925, -0.30114266052992356, 0.037232534680609414, -0.255452445570019, -0.07850126806766757, 0.28504870520423975, -0.02559702339311761, 0.03744432190095165, 0.024818211313216917, -0.030362399990460084, -0.040097266791628734, -0.15440907479984867, 0.20804252271810847, 0.06251327569386171, 0.3663603960341143, 0.013093719180793531, 0.14649589535528643, -0.012523810706672169, 0.06340852168298537, -0.03502060522122549, -0.07420508786007919, 0.035446682473224016, 0.23070060557933644, 0.026435559052192876, 0.24813598473406126, -0.38476500038297906, -0.2057483660417699, 0.06027231522565407, 0.12423415789530882, 0.15550968511210334, 0.007809150193239593, -0.28684258857561695, 0.08308103539109711, -0.20690370730514968, -0.07364946625706169, -0.019722126883965345, -0.037921461895588905, 0.008592976181347283, -0.31623275341886664, 0.08862400066779716, 0.04391164929275551, 0.0995157923789755, 0.024215433536653196, -0.07181881628367269, -0.019551707116226034, 0.013546382479609981, -0.1369369355526062, -0.0002219185323244141, 0.1961690839289898, -0.15071962948347772, -0.13439532514706615, 0.27981708312572373, -0.1461038735043633, -0.09231306801760389, 0.12619630886136643, -0.15812179146995467, 0.07442145809350956, 0.19995020295403176, 0.1394157317774971, 0.0432745176540207, -0.1445327480135846, -0.030098592872250706, 0.03436320882230516, 0.27826062794924983, 0.19796007209487498, 0.12256448233815571, 0.1835781303760145, 0.1878423201434705, 0.07560122196051863, 0.20102122542523448, -0.19007587454942687, 0.0038672040517051375, -0.2660840805991733, -0.09256539616373277, -0.13523269049943454, 0.15639197360573998, -0.07560080099680025, -0.0993648078142395, 0.45439870359616413, 0.16843166460223016, 0.1441171399828407, 0.021623786790446648, 0.35371202821693115, 0.20990512955092613, 0.07509049835404562, 0.06319756741605459, 0.3134119204756233, 0.20271832555562497, 0.10021395980861159, -0.23554507959183427, -0.060221250621121256, -0.1237336951878763] |
1,802.07324 | Using Semi-Supervised Learning for Predicting Metamorphic Relations | Software testing is difficult to automate, especially in programs which have
no oracle, or method of determining which output is correct. Metamorphic
testing is a solution this problem. Metamorphic testing uses metamorphic
relations to define test cases and expected outputs. A large amount of time is
needed for a domain expert to determine which metamorphic relations can be used
to test a given program. Metamorphic relation prediction removes this need for
such an expert. We propose a method using semi-supervised machine learning to
detect which metamorphic relations are applicable to a given code base. We
compare this semi-supervised model with a supervised model, and show that the
addition of unlabeled data improves the classification accuracy of the MR
prediction model.
| cs.SE | software testing is difficult to automate especially in programs which have no oracle or method of determining which output is correct metamorphic testing is a solution this problem metamorphic testing uses metamorphic relations to define test cases and expected outputs a large amount of time is needed for a domain expert to determine which metamorphic relations can be used to test a given program metamorphic relation prediction removes this need for such an expert we propose a method using semisupervised machine learning to detect which metamorphic relations are applicable to a given code base we compare this semisupervised model with a supervised model and show that the addition of unlabeled data improves the classification accuracy of the mr prediction model | [['software', 'testing', 'is', 'difficult', 'to', 'automate', 'especially', 'in', 'programs', 'which', 'have', 'no', 'oracle', 'or', 'method', 'of', 'determining', 'which', 'output', 'is', 'correct', 'metamorphic', 'testing', 'is', 'a', 'solution', 'this', 'problem', 'metamorphic', 'testing', 'uses', 'metamorphic', 'relations', 'to', 'define', 'test', 'cases', 'and', 'expected', 'outputs', 'a', 'large', 'amount', 'of', 'time', 'is', 'needed', 'for', 'a', 'domain', 'expert', 'to', 'determine', 'which', 'metamorphic', 'relations', 'can', 'be', 'used', 'to', 'test', 'a', 'given', 'program', 'metamorphic', 'relation', 'prediction', 'removes', 'this', 'need', 'for', 'such', 'an', 'expert', 'we', 'propose', 'a', 'method', 'using', 'semisupervised', 'machine', 'learning', 'to', 'detect', 'which', 'metamorphic', 'relations', 'are', 'applicable', 'to', 'a', 'given', 'code', 'base', 'we', 'compare', 'this', 'semisupervised', 'model', 'with', 'a', 'supervised', 'model', 'and', 'show', 'that', 'the', 'addition', 'of', 'unlabeled', 'data', 'improves', 'the', 'classification', 'accuracy', 'of', 'the', 'mr', 'prediction', 'model']] | [-0.03833150889089059, -0.007895649910278735, -0.0963334778129744, 0.11905151670507622, -0.1553807116288226, -0.21214952102939907, 0.08194432215144237, 0.3892751288910707, -0.2730633031615677, -0.391751248575747, 0.09283354448756048, -0.23317873366565134, -0.14352418692821325, 0.2033698003079432, -0.12172255829209462, 0.11829673249740154, 0.11422117742013142, 0.04552375391746561, -0.06462159701720036, -0.26916450361410776, 0.27761718885740266, 0.045205449811570965, 0.3279343587268765, -0.006565832154592499, 0.0952798224374419, -0.04155982360825874, -0.0316483969334513, 0.023056213576258717, -0.0903580221195322, 0.15011774898254468, 0.3430191233036263, 0.2378566826383273, 0.29910112243766585, -0.37580743681561823, -0.17441708697006106, 0.13304664137152333, 0.09701847226436561, 0.13432941973636237, -0.031049809737790687, -0.240274307395642, 0.11919829293037765, -0.1664759282100325, -0.046803466626685504, -0.12682308523605268, -0.01318964379800794, -0.05323366463805238, -0.3422062242558847, 0.029497437916385632, 0.0714341631392017, 0.07356816812728842, -0.04907463181686277, -0.053998743354653315, 0.042845226591452956, 0.18025804376035617, 0.027441250755024762, 0.06385779860817517, 0.10951633080064009, -0.1254624932635731, -0.14242057466569047, 0.38265847056172786, -0.019372427572185793, -0.2248235067895924, 0.21883808792626952, -0.02281345855832721, -0.15471723633430276, 0.05357620573292176, 0.24849267904646694, 0.14417550313907365, -0.2116739026202898, 0.02427554780054682, -0.044296789303189144, 0.24327057149106016, 0.04948958814299355, -0.11377518461958971, 0.18646017223751793, 0.24355079969391227, -0.02171066753314032, 0.1821408283964653, -0.11065348931758005, 0.01408112926389246, -0.2602817084795485, -0.20456992427352816, -0.1761105971527286, -0.025968205630003165, -0.08305178557226706, -0.20185980030025044, 0.3329163416618636, 0.2378653967054561, 0.16375918236250678, 0.1278091766522266, 0.2989045317963852, 0.07086823618737981, 0.1513404149717341, 0.0770665603224188, 0.18734403010845804, 0.02305783950141631, 0.05380567606383314, -0.19290383189800195, 0.15546762343340864, 0.04642587724762658] |
1,802.07325 | The chemical connection between damped Lyman-\alpha\ systems and Local
Group dwarf galaxies | Abundances of the volatile elements S and Zn have now been measured in around
80 individual stars in the Sculptor dwarf spheroidal galaxy, covering the
metallicity range $-2.4\leq\text{[Fe/H]}\leq-0.9$. These two elements are of
particular interest as they are not depleted onto dust in gas, and their ratio,
[S/Zn], has thus commonly been used as a proxy for [$\alpha$/Fe] in Damped
Lyman-$\alpha$ systems. The S abundances in Sculptor are similar to other
$\alpha$-elements in this galaxy, consistent with S being mainly created in
core-collapse supernovae, but also having some contribution from supernovae
Type Ia. However, our results show that Zn and Fe do not trace all the same
nucleosynthetic production channels. In particular, (contrary to Fe) Zn is not
significantly produced by supernovae Type Ia. Thus, [S/Zn] cannot be reliably
used as a proxy for [$\alpha$/Fe]. We propose [O/S] as a function of [S/H] as a
possible alternative. At higher metallicities, the values of [S/Zn] measured in
Damped Lyman-$\alpha$ systems are inconsistent with those in local dwarf
galaxies, and are more compatible with the Milky Way disk. Low-metallicity
Damped Lyman-$\alpha$ systems are, however, consistent with the most metal-poor
stars in Local Group dwarf spheroidal galaxies. Assuming that the dust
depletions of S and Zn are negligible, our comparison indicates that the star
formation histories of Damped Lyman-$\alpha$ systems are on average different
from both the Milky Way and the Sculptor dwarf spheroidal galaxy.
| astro-ph.GA | abundances of the volatile elements s and zn have now been measured in around 80 individual stars in the sculptor dwarf spheroidal galaxy covering the metallicity range 24leqtextfehleq09 these two elements are of particular interest as they are not depleted onto dust in gas and their ratio szn has thus commonly been used as a proxy for alphafe in damped lymanalpha systems the s abundances in sculptor are similar to other alphaelements in this galaxy consistent with s being mainly created in corecollapse supernovae but also having some contribution from supernovae type ia however our results show that zn and fe do not trace all the same nucleosynthetic production channels in particular contrary to fe zn is not significantly produced by supernovae type ia thus szn cannot be reliably used as a proxy for alphafe we propose os as a function of sh as a possible alternative at higher metallicities the values of szn measured in damped lymanalpha systems are inconsistent with those in local dwarf galaxies and are more compatible with the milky way disk lowmetallicity damped lymanalpha systems are however consistent with the most metalpoor stars in local group dwarf spheroidal galaxies assuming that the dust depletions of s and zn are negligible our comparison indicates that the star formation histories of damped lymanalpha systems are on average different from both the milky way and the sculptor dwarf spheroidal galaxy | [['abundances', 'of', 'the', 'volatile', 'elements', 's', 'and', 'zn', 'have', 'now', 'been', 'measured', 'in', 'around', '80', 'individual', 'stars', 'in', 'the', 'sculptor', 'dwarf', 'spheroidal', 'galaxy', 'covering', 'the', 'metallicity', 'range', '24leqtextfehleq09', 'these', 'two', 'elements', 'are', 'of', 'particular', 'interest', 'as', 'they', 'are', 'not', 'depleted', 'onto', 'dust', 'in', 'gas', 'and', 'their', 'ratio', 'szn', 'has', 'thus', 'commonly', 'been', 'used', 'as', 'a', 'proxy', 'for', 'alphafe', 'in', 'damped', 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1,802.07326 | Short-range antiferromagnetic interaction and spin-phonon coupling in
La2CoMnO6 double perovskite | Weak antiferromagnetic (AF) interaction in the ferromagnetic (FM) partially
ordered La2CoMnO6 (LCMO) was detected by Raman spectroscopy by monitoring
spin-phonon coupling. Because of the sensibility to probe short-range disorder
and lattice modifications, the Raman spectroscopy showed to be an useful tool
to indicate less remarkable magnetic transitions in LCMO compound. Apart from
the expected spin-phonon coupling due to the long-range FM superexchange
(Tc~230 K), phonons parameters pointed out an additional spin-phonon coupling
related to the short-range AF interaction at Tc~135 K, which was not detected
from the magnetic bulk response. These results reinforce the Raman spectroscopy
as a powerful technique to detect antisite disorder into A2B'B"O6 magnetic
double perovskites, whose magnetic properties are driven by superexchange
interactions.
| cond-mat.mtrl-sci | weak antiferromagnetic af interaction in the ferromagnetic fm partially ordered la2comno6 lcmo was detected by raman spectroscopy by monitoring spinphonon coupling because of the sensibility to probe shortrange disorder and lattice modifications the raman spectroscopy showed to be an useful tool to indicate less remarkable magnetic transitions in lcmo compound apart from the expected spinphonon coupling due to the longrange fm superexchange tc230 k phonons parameters pointed out an additional spinphonon coupling related to the shortrange af interaction at tc135 k which was not detected from the magnetic bulk response these results reinforce the raman spectroscopy as a powerful technique to detect antisite disorder into a2bbo6 magnetic double perovskites whose magnetic properties are driven by superexchange interactions | [['weak', 'antiferromagnetic', 'af', 'interaction', 'in', 'the', 'ferromagnetic', 'fm', 'partially', 'ordered', 'la2comno6', 'lcmo', 'was', 'detected', 'by', 'raman', 'spectroscopy', 'by', 'monitoring', 'spinphonon', 'coupling', 'because', 'of', 'the', 'sensibility', 'to', 'probe', 'shortrange', 'disorder', 'and', 'lattice', 'modifications', 'the', 'raman', 'spectroscopy', 'showed', 'to', 'be', 'an', 'useful', 'tool', 'to', 'indicate', 'less', 'remarkable', 'magnetic', 'transitions', 'in', 'lcmo', 'compound', 'apart', 'from', 'the', 'expected', 'spinphonon', 'coupling', 'due', 'to', 'the', 'longrange', 'fm', 'superexchange', 'tc230', 'k', 'phonons', 'parameters', 'pointed', 'out', 'an', 'additional', 'spinphonon', 'coupling', 'related', 'to', 'the', 'shortrange', 'af', 'interaction', 'at', 'tc135', 'k', 'which', 'was', 'not', 'detected', 'from', 'the', 'magnetic', 'bulk', 'response', 'these', 'results', 'reinforce', 'the', 'raman', 'spectroscopy', 'as', 'a', 'powerful', 'technique', 'to', 'detect', 'antisite', 'disorder', 'into', 'a2bbo6', 'magnetic', 'double', 'perovskites', 'whose', 'magnetic', 'properties', 'are', 'driven', 'by', 'superexchange', 'interactions']] | [-0.1822166053803496, 0.2512818327398829, -0.01749310167759414, 0.03924265716872785, -0.0820328547173868, -0.1917211310249632, 0.09169288312145711, 0.4355850308485653, -0.3292803523738099, -0.26397975747595015, -0.05227726834178295, -0.3516092054100464, -0.12704565079032404, 0.14953178188399127, 0.14924573431034452, -0.07100130845792592, -0.05134982873240243, -0.058975544905937885, -0.045682708944355985, -0.20759496413090306, 0.23518891665760588, 0.06718676284755297, 0.2716505428371222, 0.12533672803850926, -0.04420829354582921, 0.04549766154149952, 0.11883651979024644, 0.0032605767169076464, -0.1299873961813991, 0.005356702368463511, 0.2899034698058487, -0.1790909143589923, 0.19253446782898645, -0.40645672989928205, -0.2260124708890267, -0.020856696764088196, 0.13699313205332778, 0.11323771490006829, -0.022873098289837007, -0.3768546046102015, 0.03956544335460817, -0.11536643536275495, -0.10036763316070985, -0.18774663365608, -0.048326204069282695, -0.004046108553429012, -0.32283922088453954, 0.08295948592864949, 0.10316252878452044, 0.16469972579861464, -0.10848405081373842, -0.08962990606163183, -0.08910099504232083, 0.058238386538932506, 0.10240218005669506, 0.11107036630299104, 0.14318892057256205, -0.0564229739991867, -0.13586616720599326, 0.31421818345704156, -0.05834327181396277, 0.0006374269561923068, 0.20362724442662591, -0.1757721934751, -0.1120795298408231, 0.25403647857272754, 0.058568697784136495, 0.07580515387184594, -0.1956715657254276, 0.053279201428750124, 0.08468236951967296, 0.24492426210933405, 0.02012450033393891, 0.11724170852938424, 0.24492585544029008, 0.15972385738530884, 0.009712569763802964, 0.1616612791782245, -0.12061411666433307, -0.01586405328758385, -0.1431785349369697, -0.07717438864967098, -0.24503391891839388, 0.09574494527718659, -0.09728963208655604, -0.15185751988066604, 0.298228734108093, 0.17442645713960267, 0.12039461957047815, -0.1554115251465903, 0.21349325920252696, 0.03072888990762927, 0.12842912040650845, -0.05001636647983738, 0.34336527626880486, 0.2706458238783576, 0.12244941694257053, -0.3465312871353134, 0.10238356888901605, 0.019005143277994966] |
1,802.07327 | Asymmetric skyrmion Hall effect in systems with a hybrid
Dzyaloshinskii-Moriya interaction | We examine the current-induced dynamics of a skyrmion that is subject to both
structural and bulk inversion asymmetry. There arises a hybrid type of
Dzyaloshinskii-Moriya interaction (DMI) which is in the form of a mixture of
interfacial and bulk DMIs. Examples include crystals with symmetry classes
C$_n$ as well as magnetic multilayers composed of a ferromagnet with a
noncentrosymmetric crystal and a nonmagnet with strong spin-orbit coupling. As
a striking result, we find that, in systems with a hybrid DMI, the
spin-orbit-torque-induced skyrmion Hall angle is asymmetric for the two
different skyrmion polarities ($\pm 1$ given by out-of-plane core
magnetization), even allowing one of them to be tuned to zero. We propose
several experimental ways to achieve the necessary straight skyrmion motion
(with zero Hall angle) for racetrack memories, even without antiferromagnetic
interactions or any interaction with another magnet. Our results can be
understood within a simple picture by using a global spin rotation which maps
the hybrid DMI model to an effective model containing purely interfacial DMI.
The formalism directly reveals the effective spin torque and effective current
that result in qualitatively different dynamics. Our work provides a way to
utilize symmetry breaking to eliminate detrimental phenomena as hybrid DMI
eliminates the skyrmion Hall angle.
| cond-mat.mes-hall cond-mat.mtrl-sci | we examine the currentinduced dynamics of a skyrmion that is subject to both structural and bulk inversion asymmetry there arises a hybrid type of dzyaloshinskiimoriya interaction dmi which is in the form of a mixture of interfacial and bulk dmis examples include crystals with symmetry classes c_n as well as magnetic multilayers composed of a ferromagnet with a noncentrosymmetric crystal and a nonmagnet with strong spinorbit coupling as a striking result we find that in systems with a hybrid dmi the spinorbittorqueinduced skyrmion hall angle is asymmetric for the two different skyrmion polarities pm 1 given by outofplane core magnetization even allowing one of them to be tuned to zero we propose several experimental ways to achieve the necessary straight skyrmion motion with zero hall angle for racetrack memories even without antiferromagnetic interactions or any interaction with another magnet our results can be understood within a simple picture by using a global spin rotation which maps the hybrid dmi model to an effective model containing purely interfacial dmi the formalism directly reveals the effective spin torque and effective current that result in qualitatively different dynamics our work provides a way to utilize symmetry breaking to eliminate detrimental phenomena as hybrid dmi eliminates the skyrmion hall angle | [['we', 'examine', 'the', 'currentinduced', 'dynamics', 'of', 'a', 'skyrmion', 'that', 'is', 'subject', 'to', 'both', 'structural', 'and', 'bulk', 'inversion', 'asymmetry', 'there', 'arises', 'a', 'hybrid', 'type', 'of', 'dzyaloshinskiimoriya', 'interaction', 'dmi', 'which', 'is', 'in', 'the', 'form', 'of', 'a', 'mixture', 'of', 'interfacial', 'and', 'bulk', 'dmis', 'examples', 'include', 'crystals', 'with', 'symmetry', 'classes', 'c_n', 'as', 'well', 'as', 'magnetic', 'multilayers', 'composed', 'of', 'a', 'ferromagnet', 'with', 'a', 'noncentrosymmetric', 'crystal', 'and', 'a', 'nonmagnet', 'with', 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1,802.07328 | Gamma-ray burst models in light of the GRB 170817A - GW170817 connection | For the first time, a short gamma-ray burst (GRB) was unambiguously
associated with a gravitational wave (GW) observation from a binary neutron
star (NS) merger. This allows us to link the details of the central engine
properties to GRB emission models. We find that photospheric models (both
dissipative and non-dissipative variants) have difficulties accounting for the
observations. Internal shocks give the most natural account of the observed
peak energy, viewing angle and total energy. We also show that a simple
external shock model can reproduce the observed GRB pulse with parameters
consistent with those derived from the afterglow modeling. We find a simple
cocoon shock breakout model is in mild tension with the observed spectral
evolution, however it cannot be excluded based on gamma-ray data alone. Future
joint observations of brighter GRBs will pose even tighter constraints on
prompt emission models.
| astro-ph.HE | for the first time a short gammaray burst grb was unambiguously associated with a gravitational wave gw observation from a binary neutron star ns merger this allows us to link the details of the central engine properties to grb emission models we find that photospheric models both dissipative and nondissipative variants have difficulties accounting for the observations internal shocks give the most natural account of the observed peak energy viewing angle and total energy we also show that a simple external shock model can reproduce the observed grb pulse with parameters consistent with those derived from the afterglow modeling we find a simple cocoon shock breakout model is in mild tension with the observed spectral evolution however it cannot be excluded based on gammaray data alone future joint observations of brighter grbs will pose even tighter constraints on prompt emission models | [['for', 'the', 'first', 'time', 'a', 'short', 'gammaray', 'burst', 'grb', 'was', 'unambiguously', 'associated', 'with', 'a', 'gravitational', 'wave', 'gw', 'observation', 'from', 'a', 'binary', 'neutron', 'star', 'ns', 'merger', 'this', 'allows', 'us', 'to', 'link', 'the', 'details', 'of', 'the', 'central', 'engine', 'properties', 'to', 'grb', 'emission', 'models', 'we', 'find', 'that', 'photospheric', 'models', 'both', 'dissipative', 'and', 'nondissipative', 'variants', 'have', 'difficulties', 'accounting', 'for', 'the', 'observations', 'internal', 'shocks', 'give', 'the', 'most', 'natural', 'account', 'of', 'the', 'observed', 'peak', 'energy', 'viewing', 'angle', 'and', 'total', 'energy', 'we', 'also', 'show', 'that', 'a', 'simple', 'external', 'shock', 'model', 'can', 'reproduce', 'the', 'observed', 'grb', 'pulse', 'with', 'parameters', 'consistent', 'with', 'those', 'derived', 'from', 'the', 'afterglow', 'modeling', 'we', 'find', 'a', 'simple', 'cocoon', 'shock', 'breakout', 'model', 'is', 'in', 'mild', 'tension', 'with', 'the', 'observed', 'spectral', 'evolution', 'however', 'it', 'can', 'not', 'be', 'excluded', 'based', 'on', 'gammaray', 'data', 'alone', 'future', 'joint', 'observations', 'of', 'brighter', 'grbs', 'will', 'pose', 'even', 'tighter', 'constraints', 'on', 'prompt', 'emission', 'models']] | [-0.07609664490052932, 0.1093746710131699, -0.08538879943736108, 0.19390028971903236, -0.18352106839261004, -0.12189360518905361, 0.02649248859264665, 0.46190663450725483, -0.20173415913931947, -0.3273201853882941, 0.024734423701605484, -0.26232881549244474, -0.03308136842499895, 0.2536007097732066, 5.694566635598599e-05, -0.01766896440932842, 0.15021798055468152, -0.0455647757355596, -0.08662623366747628, -0.18277535114099575, 0.2661557901367007, 0.1315422867306731, 0.19131530854136938, 0.025933419088636275, 0.08777519230629173, -0.05664301834570926, -0.042378010162690154, -0.027111880057392984, -0.14077937501041188, 0.014967841151970583, 0.1996935288403927, 0.14231777014981456, 0.1471777509465079, -0.46201497606087055, -0.30796489153388545, 0.11146764802208668, 0.09909093553449591, 0.06705717179714374, -0.03475571467547717, -0.2901773489134478, 0.01720272244116567, -0.22856707419891856, -0.12666057264366726, 0.04974822215998257, 0.030815317095659055, 0.07529383603686013, -0.21278270915426103, 0.12775729701204167, 0.03523765915421061, -0.022811430011233185, -0.11552140335626179, -0.00010201021287800141, -0.04101849665445551, 0.03800481162361906, 0.09160049122546694, 0.06211365917107274, 0.13494869602785092, -0.14425803106245388, -0.08912373286947398, 0.42867835319246833, -0.07430348341995982, -0.031415666610946955, 0.18820112938402403, -0.19472023326260837, -0.20058253403871099, 0.1879880195909875, 0.13300735032690925, 0.06107409432871451, -0.15841564290802662, -0.03154251745551116, -0.013920101950262364, 0.2038823964310364, 0.01691461369578897, 0.02269746236909758, 0.3084628006482733, 0.14168332316453608, -0.01150824029726619, 0.09755418774373435, -0.22411244509874476, 0.003567655938087215, -0.32355679411270566, -0.049442492583258286, -0.1350547435536036, 0.11021466251064263, -0.13262282011511534, -0.10701006649981883, 0.41091949484494683, 0.14938734541975066, 0.19153501522320676, 0.07782503368634679, 0.28715309167516906, 0.1404765461564136, 0.049677207954490266, 0.12135027202738213, 0.3299838849081015, 0.12097084409439228, 0.09757324038300923, -0.22100549456532256, 0.14157953364963144, -0.0018378706471863346] |
1,802.07329 | Bayesian Incremental Learning for Deep Neural Networks | In industrial machine learning pipelines, data often arrive in parts.
Particularly in the case of deep neural networks, it may be too expensive to
train the model from scratch each time, so one would rather use a previously
learned model and the new data to improve performance. However, deep neural
networks are prone to getting stuck in a suboptimal solution when trained on
only new data as compared to the full dataset. Our work focuses on a continuous
learning setup where the task is always the same and new parts of data arrive
sequentially. We apply a Bayesian approach to update the posterior
approximation with each new piece of data and find this method to outperform
the traditional approach in our experiments.
| stat.ML cs.LG | in industrial machine learning pipelines data often arrive in parts particularly in the case of deep neural networks it may be too expensive to train the model from scratch each time so one would rather use a previously learned model and the new data to improve performance however deep neural networks are prone to getting stuck in a suboptimal solution when trained on only new data as compared to the full dataset our work focuses on a continuous learning setup where the task is always the same and new parts of data arrive sequentially we apply a bayesian approach to update the posterior approximation with each new piece of data and find this method to outperform the traditional approach in our experiments | [['in', 'industrial', 'machine', 'learning', 'pipelines', 'data', 'often', 'arrive', 'in', 'parts', 'particularly', 'in', 'the', 'case', 'of', 'deep', 'neural', 'networks', 'it', 'may', 'be', 'too', 'expensive', 'to', 'train', 'the', 'model', 'from', 'scratch', 'each', 'time', 'so', 'one', 'would', 'rather', 'use', 'a', 'previously', 'learned', 'model', 'and', 'the', 'new', 'data', 'to', 'improve', 'performance', 'however', 'deep', 'neural', 'networks', 'are', 'prone', 'to', 'getting', 'stuck', 'in', 'a', 'suboptimal', 'solution', 'when', 'trained', 'on', 'only', 'new', 'data', 'as', 'compared', 'to', 'the', 'full', 'dataset', 'our', 'work', 'focuses', 'on', 'a', 'continuous', 'learning', 'setup', 'where', 'the', 'task', 'is', 'always', 'the', 'same', 'and', 'new', 'parts', 'of', 'data', 'arrive', 'sequentially', 'we', 'apply', 'a', 'bayesian', 'approach', 'to', 'update', 'the', 'posterior', 'approximation', 'with', 'each', 'new', 'piece', 'of', 'data', 'and', 'find', 'this', 'method', 'to', 'outperform', 'the', 'traditional', 'approach', 'in', 'our', 'experiments']] | [-0.006561894510103558, -0.007403368828818202, -0.1120184300940667, 0.07182955222021116, -0.15052260503890452, -0.20156711430029303, 0.07269308147341257, 0.4193026788425861, -0.28261179840726564, -0.32021502633273724, 0.11139283618855397, -0.2682636067630021, -0.16602940306250677, 0.21839775716443163, -0.1202015527600392, 0.07950892450562755, 0.1633261835668236, 0.07131968340149424, -0.05058108669033915, -0.31369080083047757, 0.28647241034052623, 0.06422457955042893, 0.33859120953644883, -0.04062738654978543, 0.09024785273254192, -0.037496600569164776, -0.027408294410246316, -0.02977762035414821, -0.03855716837875423, 0.1523324358525121, 0.318858159797602, 0.1824511212037235, 0.3462335090229257, -0.47623182230125194, -0.20174319893274395, 0.12067492859491498, 0.14199856446949063, 0.14761042552160436, -0.0013783540334323513, -0.3025681422164542, 0.0632622845482356, -0.1582330288747173, -0.023097688671903777, -0.14431397736713777, -0.05211485391406373, -0.023786431528650773, -0.302330699672953, 0.017276933943455825, 0.03972749757107164, 0.0019993365696463427, -0.03319674327427552, -0.11130282772155325, 0.01566997434959182, 0.14603742784138227, 0.06266059712354155, 0.08628859875922198, 0.11722013822252877, -0.17364139480327379, -0.11464624399830756, 0.3610039149701107, -0.060463132882551826, -0.22531970080415734, 0.20357423351474535, -0.044579950779615365, -0.18710390565397797, 0.1223590239084738, 0.2616299814926308, 0.14634715639375395, -0.19504793461845887, 0.00344220260549413, -0.03162119365163667, 0.1708865627802939, 0.0021726777796160245, -0.05032884732621615, 0.1435101771389409, 0.2736260980027957, 0.039554334356312136, 0.1294811619626984, -0.10297738196572563, -0.08912898780258953, -0.21475944284647397, -0.0856782678442198, -0.23419869069742863, -0.021048679413487675, -0.06818892986508426, -0.14236374994640652, 0.361611484756052, 0.2551348042019765, 0.253175724366466, 0.12620785067117482, 0.38612517388537526, 0.027191041717801977, 0.14576954131213124, 0.11841878482306635, 0.22546766811054292, -0.015122709396967023, 0.15924818435164748, -0.10931689549260391, 0.08198633743068356, 0.010901164318831851] |
1,802.0733 | A folded model for compositional data analysis | A folded type model is developed for analyzing compositional data. The
proposed model involves an extension of the $\alpha$-transformation for
compositional data and provides a new and flexible class of distributions for
modeling data defined on the simplex sample space. Despite its rather seemingly
complex structure, employment of the EM algorithm guarantees efficient
parameter estimation. The model is validated through simulation studies and
examples which illustrate that the proposed model performs better in terms of
capturing the data structure, when compared to the popular logistic normal
distribution, and can be advantageous over a similar model without folding.
| stat.ML stat.ME | a folded type model is developed for analyzing compositional data the proposed model involves an extension of the alphatransformation for compositional data and provides a new and flexible class of distributions for modeling data defined on the simplex sample space despite its rather seemingly complex structure employment of the em algorithm guarantees efficient parameter estimation the model is validated through simulation studies and examples which illustrate that the proposed model performs better in terms of capturing the data structure when compared to the popular logistic normal distribution and can be advantageous over a similar model without folding | [['a', 'folded', 'type', 'model', 'is', 'developed', 'for', 'analyzing', 'compositional', 'data', 'the', 'proposed', 'model', 'involves', 'an', 'extension', 'of', 'the', 'alphatransformation', 'for', 'compositional', 'data', 'and', 'provides', 'a', 'new', 'and', 'flexible', 'class', 'of', 'distributions', 'for', 'modeling', 'data', 'defined', 'on', 'the', 'simplex', 'sample', 'space', 'despite', 'its', 'rather', 'seemingly', 'complex', 'structure', 'employment', 'of', 'the', 'em', 'algorithm', 'guarantees', 'efficient', 'parameter', 'estimation', 'the', 'model', 'is', 'validated', 'through', 'simulation', 'studies', 'and', 'examples', 'which', 'illustrate', 'that', 'the', 'proposed', 'model', 'performs', 'better', 'in', 'terms', 'of', 'capturing', 'the', 'data', 'structure', 'when', 'compared', 'to', 'the', 'popular', 'logistic', 'normal', 'distribution', 'and', 'can', 'be', 'advantageous', 'over', 'a', 'similar', 'model', 'without', 'folding']] | [-0.05601363843210887, -0.0024310546198358144, -0.10777858203725851, 0.10495644650954906, -0.09706190118047688, -0.15537229630635263, 0.041951822246588076, 0.36953516638616923, -0.26468278717288035, -0.3166937579007186, 0.09338082069862327, -0.23448426202995723, -0.16968206697522864, 0.24674419951913207, -0.06136699670868129, 0.06876117399516851, 0.09839568426832557, 0.01196686438159998, -0.06966723110430788, -0.20364149490649783, 0.28462873612885775, 0.10496932936870713, 0.3417816432294935, -0.04027781971327039, 0.12431855623120654, 0.03442713636520904, -0.051799145114329675, 0.03802906293103942, -0.09126640018833304, 0.14939206838367758, 0.21135040406694577, 0.17344801031417914, 0.26735479415384766, -0.3903360896423242, -0.26812897490087856, 0.09125089158841707, 0.1208431019745383, 0.06524995034056495, -0.05921585069244401, -0.27914781025466845, 0.08359157575351983, -0.16874340226508908, -0.10471218188782942, -0.15345774588088706, -0.018595435987850746, -0.012539850280274512, -0.32067640722590046, 0.0684882020529782, 0.06551310992991724, 0.06286351366410244, -0.0714748153455805, -0.1224377045945562, -0.03801147375716684, 0.08144595372621402, 0.021893953327233567, -0.0009183532500773976, 0.07076288376707997, -0.1179698447783276, -0.10599130668590978, 0.3892996732683219, -0.05254803345893923, -0.23304866361863835, 0.1933342328525542, -0.05941020248976258, -0.10770403972548462, 0.13726383117363625, 0.18450069321876333, 0.11461985317183677, -0.16445477487301555, 0.09088968172352568, -0.05499064960617803, 0.14816507390105002, -0.03698832859506005, -0.03870129696160708, 0.1337728975340724, 0.26562459889040857, 0.018641969789126793, 0.15025947691234232, -0.1059883156522494, -0.1628010595360166, -0.23749012415556564, -0.1459978076517726, -0.1825056489240186, -0.060589332552386695, -0.14040494325616368, -0.17075419644873166, 0.4335526839599551, 0.15283789863742733, 0.21883566827350057, 0.09518625144726722, 0.3162845302872437, 0.06075280442229021, 0.07673425448952799, 0.07106991225047056, 0.14927370527509562, 0.08352311316531957, 0.04671827033906215, -0.16832957855190545, 0.1547942038423852, 0.013318148880870533] |
1,802.07331 | Strongly enhanced tunneling at total charge neutrality in double bilayer
graphene-WSe$_2$ heterostructures | We report the experimental observation of strongly enhanced tunneling between
graphene bilayers through a WSe$_2$ barrier when the graphene bilayers are
populated with carriers of opposite polarity and equal density. The enhanced
tunneling increases sharply in strength with decreasing temperature, and the
tunneling current exhibits a vertical onset as a function of interlayer voltage
at a temperature of 1.5 K. The strongly enhanced tunneling at overall
neutrality departs markedly from single-particle model calculations that
otherwise match the measured tunneling current-voltage characteristics well,
and suggests the emergence of a many-body state with condensed interbilayer
excitons when electrons and holes of equal densities populate the two layers.
| cond-mat.mes-hall | we report the experimental observation of strongly enhanced tunneling between graphene bilayers through a wse_2 barrier when the graphene bilayers are populated with carriers of opposite polarity and equal density the enhanced tunneling increases sharply in strength with decreasing temperature and the tunneling current exhibits a vertical onset as a function of interlayer voltage at a temperature of 15 k the strongly enhanced tunneling at overall neutrality departs markedly from singleparticle model calculations that otherwise match the measured tunneling currentvoltage characteristics well and suggests the emergence of a manybody state with condensed interbilayer excitons when electrons and holes of equal densities populate the two layers | [['we', 'report', 'the', 'experimental', 'observation', 'of', 'strongly', 'enhanced', 'tunneling', 'between', 'graphene', 'bilayers', 'through', 'a', 'wse_2', 'barrier', 'when', 'the', 'graphene', 'bilayers', 'are', 'populated', 'with', 'carriers', 'of', 'opposite', 'polarity', 'and', 'equal', 'density', 'the', 'enhanced', 'tunneling', 'increases', 'sharply', 'in', 'strength', 'with', 'decreasing', 'temperature', 'and', 'the', 'tunneling', 'current', 'exhibits', 'a', 'vertical', 'onset', 'as', 'a', 'function', 'of', 'interlayer', 'voltage', 'at', 'a', 'temperature', 'of', '15', 'k', 'the', 'strongly', 'enhanced', 'tunneling', 'at', 'overall', 'neutrality', 'departs', 'markedly', 'from', 'singleparticle', 'model', 'calculations', 'that', 'otherwise', 'match', 'the', 'measured', 'tunneling', 'currentvoltage', 'characteristics', 'well', 'and', 'suggests', 'the', 'emergence', 'of', 'a', 'manybody', 'state', 'with', 'condensed', 'interbilayer', 'excitons', 'when', 'electrons', 'and', 'holes', 'of', 'equal', 'densities', 'populate', 'the', 'two', 'layers']] | [-0.16417237518443947, 0.25689305678409124, -0.03043877617012532, 0.026230982407217933, 0.06150440832688695, -0.20423319477676635, 0.12152483031331074, 0.3658664233982563, -0.234435825768326, -0.3243178672024182, -0.09402200221416673, -0.36578581773099444, -0.11632368805862608, 0.16367799997595803, 0.06870389916889724, -0.048991941953344005, -0.0010443483257577533, -0.056330474856353945, -0.09172446214860039, -0.17773916116206065, 0.27945414605838736, 0.039403201566476906, 0.3681427732642208, 0.14963124708405562, 0.015758800712813225, 0.0027189772397659476, 0.10122252464560526, 0.05721289456955024, -0.14114669003735927, 0.010973205639138109, 0.22269638086713495, -0.14213720456187037, 0.2150221541435236, -0.45992835638601154, -0.1725277291610837, -0.017463654790827562, 0.1968761835291627, 0.1449064699622492, -0.0720044091889923, -0.2703876358944745, 0.028761607142431395, -0.1356217352895155, -0.09267610197088548, 0.01113230897379773, 0.005233996982375781, 0.037618570708270585, -0.229459225120289, 0.16774274434096048, -0.001490627208148085, 0.05776648398958579, -0.10597186978196814, -0.1288825893045647, -0.1479337944383068, 0.04065325538977049, 0.0623392632086983, 0.05292299137051616, 0.27345321860075705, -0.1523310880093569, -0.09677396623772525, 0.29355765131435224, -0.09213085082315263, -0.0516445183594312, 0.18916361823988456, -0.23685705169503177, 0.023494107532037775, 0.17643049690162851, 0.04088898284854146, 0.10224208198820374, -0.07185648905606719, 0.050284396398014256, 0.011100727079125742, 0.16055330766497977, 0.08118096227935027, 0.08482195717681731, 0.3130955746863037, 0.18909415189465065, 0.051994677257191924, 0.11281724986287632, -0.1259923483378121, -0.058014190467518004, -0.2007004733064345, -0.13411639746045695, -0.21241916700133257, 0.09401222432830504, -0.047102070248885346, -0.21044645935208314, 0.4314838783726806, 0.1376727791325677, 0.25211277868421306, -0.0024465783454832575, 0.2932246767978497, 0.17012386568045865, 0.06601769579574465, 0.012998113665907156, 0.24729779526768697, 0.1701378925703466, 0.12751292463480718, -0.314200135202901, 0.08878720436422598, -0.05637164406611451] |
1,802.07332 | Achievability Bounds for T-Fold Irregular Repetition Slotted ALOHA
Scheme in the Gaussian MAC | We address the problem of uncoordinated massive random-access in the Gaussian
multiple access channel (MAC). The performance of low-complexity T-fold
irregular repetition slotted ALOHA (IRSA) scheme is investigated and
achievability bounds are derived. The main difference of this scheme in
comparison to IRSA is as follows: any collisions of order up to T can be
resolved with some probability of error introduced by noise. In order to
optimize the parameters of the scheme we combine the density evolution method
(DE) proposed by G. Liva and a finite length random coding bound for the
Gaussian MAC proposed by Y. Polyanskiy. As energy efficiency is of critical
importance for massive machine-type communication (mMTC), then our main goal is
to minimize the energy-per-bit required to achieve the target packet loss ratio
(PLR). We consider two scenarios: (a) the number of active users is fixed; (b)
the number of active users is a Poisson random variable.
| cs.IT math.IT | we address the problem of uncoordinated massive randomaccess in the gaussian multiple access channel mac the performance of lowcomplexity tfold irregular repetition slotted aloha irsa scheme is investigated and achievability bounds are derived the main difference of this scheme in comparison to irsa is as follows any collisions of order up to t can be resolved with some probability of error introduced by noise in order to optimize the parameters of the scheme we combine the density evolution method de proposed by g liva and a finite length random coding bound for the gaussian mac proposed by y polyanskiy as energy efficiency is of critical importance for massive machinetype communication mmtc then our main goal is to minimize the energyperbit required to achieve the target packet loss ratio plr we consider two scenarios a the number of active users is fixed b the number of active users is a poisson random variable | [['we', 'address', 'the', 'problem', 'of', 'uncoordinated', 'massive', 'randomaccess', 'in', 'the', 'gaussian', 'multiple', 'access', 'channel', 'mac', 'the', 'performance', 'of', 'lowcomplexity', 'tfold', 'irregular', 'repetition', 'slotted', 'aloha', 'irsa', 'scheme', 'is', 'investigated', 'and', 'achievability', 'bounds', 'are', 'derived', 'the', 'main', 'difference', 'of', 'this', 'scheme', 'in', 'comparison', 'to', 'irsa', 'is', 'as', 'follows', 'any', 'collisions', 'of', 'order', 'up', 'to', 't', 'can', 'be', 'resolved', 'with', 'some', 'probability', 'of', 'error', 'introduced', 'by', 'noise', 'in', 'order', 'to', 'optimize', 'the', 'parameters', 'of', 'the', 'scheme', 'we', 'combine', 'the', 'density', 'evolution', 'method', 'de', 'proposed', 'by', 'g', 'liva', 'and', 'a', 'finite', 'length', 'random', 'coding', 'bound', 'for', 'the', 'gaussian', 'mac', 'proposed', 'by', 'y', 'polyanskiy', 'as', 'energy', 'efficiency', 'is', 'of', 'critical', 'importance', 'for', 'massive', 'machinetype', 'communication', 'mmtc', 'then', 'our', 'main', 'goal', 'is', 'to', 'minimize', 'the', 'energyperbit', 'required', 'to', 'achieve', 'the', 'target', 'packet', 'loss', 'ratio', 'plr', 'we', 'consider', 'two', 'scenarios', 'a', 'the', 'number', 'of', 'active', 'users', 'is', 'fixed', 'b', 'the', 'number', 'of', 'active', 'users', 'is', 'a', 'poisson', 'random', 'variable']] | [-0.221457416419902, 0.07592585700446901, -0.04900365329612762, 0.05165609706961087, -0.03745296364804323, -0.19976126400457805, 0.11275635956052617, 0.3891677288215188, -0.2522719194742524, -0.2935608706578908, 0.06868826809481082, -0.21465679215551015, -0.1394154591075706, 0.13987695316195067, -0.1505135740616069, 0.09840094714135622, -0.0009499288284349324, 0.048616919654193305, -0.008812792563736932, -0.31733486332794936, 0.3030868311542154, 0.11688620763035207, 0.3181865424309419, 0.008171160662213697, 0.06881982404491957, 0.017731710790813784, -0.06232636095339198, -0.04950323585877257, -0.12089443051052705, 0.08407738611710394, 0.289263969108413, 0.14259194635742942, 0.2982656176060142, -0.34758302661442253, -0.2610881692045276, 0.08385540311847696, 0.16537852627795732, 0.06613640604380346, -0.0469366813645951, -0.2311303201717454, 0.19326387460741357, -0.21968842772705272, -0.07211202742926628, 0.04315850492690178, -0.04833170947995012, 0.09073464987207426, -0.3607690685755567, 0.02732813886685963, 0.0257038420423964, -0.018916610992260722, -0.015209085801190354, -0.11312581421283154, 0.0335315460946707, 0.13940946238473156, 0.0068687737205479025, 0.04060966136020343, 0.09608083073395175, -0.06232284050163449, -0.12961180679907172, 0.35826421678312964, -0.06204798925106741, -0.20688295257061917, 0.15417477023049214, -0.07066668868866681, -0.07960793093642504, 0.1689750041183553, 0.2319122680728108, 0.10274800440506232, -0.1507668308420292, 0.06373046831280264, -0.024253650646292858, 0.15743663597124202, 0.1080652803694521, 0.11385007330913417, 0.09753020542106339, 0.19155619741072077, 0.12240589129436293, 0.13966355437570135, -0.12428444130839594, -0.1121365407409319, -0.27128351389450506, -0.128871559916721, -0.23103873698050095, 0.017259657259611105, -0.12082226700839488, -0.07857171734964587, 0.3317926240792594, 0.1295695966572211, 0.16407548460727003, 0.09994188455297359, 0.3710968362503617, 0.10823929121344665, 0.0255144408658079, 0.14310850443269144, 0.15055188175621567, 0.1624220610243139, 0.09052073737199338, -0.22337860852442928, 0.05740487940350412, 0.05155214372041654] |
1,802.07333 | Modeling of Supersonic Radiative Marshak waves using Simple Models and
Advanced Simulations | We study the problem of radiative heat (Marshak) waves using advanced
approximate approaches. Supersonic radiative Marshak waves that are propagating
into a material are radiation dominated (i.e. hydrodynamic motion is
negligible), and can be described by the Boltzmann equation. However, the exact
thermal radiative transfer problem is a nontrivial one, and there still exists
a need for approximations that are simple to solve. The discontinuous
asymptotic $P_1$ approximation, which is a combination of the asymptotic $P_1$
and the discontinuous asymptotic diffusion approximations, was tested in
previous work via theoretical benchmarks. Here we analyze a fundamental and
typical experiment of a supersonic Marshak wave propagation in a low-density
$\mathrm{SiO_2}$ foam cylinder, embedded in gold walls. First, we offer a
simple analytic model, that grasps the main effects dominating the physical
system. We find the physics governing the system to be dominated by a simple,
one-dimensional effect, based on the careful observation of the different
radiation temperatures that are involved in the problem. The model is completed
with the main two-dimensional effect which is caused by the loss of energy to
the gold walls. Second, we examine the validity of the discontinuous asymptotic
$P_1$ approximation, comparing to exact simulations with good accuracy.
Specifically, the heat front position as a function of the time is reproduced
perfectly in compare to exact Boltzmann solutions.
| physics.comp-ph cond-mat.stat-mech physics.plasm-ph | we study the problem of radiative heat marshak waves using advanced approximate approaches supersonic radiative marshak waves that are propagating into a material are radiation dominated ie hydrodynamic motion is negligible and can be described by the boltzmann equation however the exact thermal radiative transfer problem is a nontrivial one and there still exists a need for approximations that are simple to solve the discontinuous asymptotic p_1 approximation which is a combination of the asymptotic p_1 and the discontinuous asymptotic diffusion approximations was tested in previous work via theoretical benchmarks here we analyze a fundamental and typical experiment of a supersonic marshak wave propagation in a lowdensity mathrmsio_2 foam cylinder embedded in gold walls first we offer a simple analytic model that grasps the main effects dominating the physical system we find the physics governing the system to be dominated by a simple onedimensional effect based on the careful observation of the different radiation temperatures that are involved in the problem the model is completed with the main twodimensional effect which is caused by the loss of energy to the gold walls second we examine the validity of the discontinuous asymptotic p_1 approximation comparing to exact simulations with good accuracy specifically the heat front position as a function of the time is reproduced perfectly in compare to exact boltzmann solutions | [['we', 'study', 'the', 'problem', 'of', 'radiative', 'heat', 'marshak', 'waves', 'using', 'advanced', 'approximate', 'approaches', 'supersonic', 'radiative', 'marshak', 'waves', 'that', 'are', 'propagating', 'into', 'a', 'material', 'are', 'radiation', 'dominated', 'ie', 'hydrodynamic', 'motion', 'is', 'negligible', 'and', 'can', 'be', 'described', 'by', 'the', 'boltzmann', 'equation', 'however', 'the', 'exact', 'thermal', 'radiative', 'transfer', 'problem', 'is', 'a', 'nontrivial', 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1,802.07334 | Multigap superconductivity in RbCa2Fe4As4F2 investigated using muSR
measurements | The superconducting properties of the recently discovered double Fe$_2$As$_2$
layered high-$T_c$ superconductor RbCa$_2$Fe$_4$As$_4$F$_2$ with $T_c\approx$
30~K have been investigated using magnetization, heat capacity,
transverse-field (TF) and zero-field (ZF) muon-spin rotation/relaxation
($\mu$SR) measurements. Our low field magnetization measurements and heat
capacity (C$_p$) reveal an onset of bulk superconductivity with $T_{\bf c}\sim$
30.0(4) K. Furthermore, the heat capacity exhibits a jump at $T_{\bf c}$ of
$\Delta$C$_p$/$T_{\bf c}$=94.6 (mJ/mole-K$^2$) and no clear effect of applied
magnetic fields was observed on C$_p$(T) up to 9 T between 2 K and 5 K. Our
analysis of the TF-$\mu$SR results shows that the temperature dependence of the
magnetic penetration depth is better described by a two-gap model, either
isotropic $s$+$s$-wave or $s$+$d$-wave than a single gap isotropic $s$-wave or
$d$-wave model for the superconducting gap. The presence of two superconducting
gaps in RbCa$_2$Fe$_4$As$_4$F$_2$ suggests a multiband nature of the
superconductivity, which is consistent with the multigap superconductivity
observed in other Fe-based superconductors, including ACa$_2$Fe$_4$As$_4$F$_2$
(A=K and Cs). Furthermore, from our TF-$\mu$SR study we have estimated an
in-plane penetration depth $\lambda_{\mathrm{ab}}$$(0)$ =231.5(3) nm,
superconducting carrier density $n_s = 7.45 \times 10^{26}~ $m$^{-3}$, and
carrier's effective-mass $m^*$ = 2.45\textit{m}$_{e}$. Our ZF $\mu$SR
measurements do not reveal a clear sign of time reversal symmetry breaking at
$T_{\bf c}$, but the temperature dependent relaxation between 150 K and 1.2 K
might indicate the presence of spin-fluctuations. The results of our present
study have been compared with those reported for other Fe pnictide
superconductors.
| cond-mat.supr-con | the superconducting properties of the recently discovered double fe_2as_2 layered hight_c superconductor rbca_2fe_4as_4f_2 with t_capprox 30k have been investigated using magnetization heat capacity transversefield tf and zerofield zf muonspin rotationrelaxation musr measurements our low field magnetization measurements and heat capacity c_p reveal an onset of bulk superconductivity with t_bf csim 3004 k furthermore the heat capacity exhibits a jump at t_bf c of deltac_pt_bf c946 mjmolek2 and no clear effect of applied magnetic fields was observed on c_pt up to 9 t between 2 k and 5 k our analysis of the tfmusr results shows that the temperature dependence of the magnetic penetration depth is better described by a twogap model either isotropic sswave or sdwave than a single gap isotropic swave or dwave model for the superconducting gap the presence of two superconducting gaps in rbca_2fe_4as_4f_2 suggests a multiband nature of the superconductivity which is consistent with the multigap superconductivity observed in other febased superconductors including aca_2fe_4as_4f_2 ak and cs furthermore from our tfmusr study we have estimated an inplane penetration depth lambda_mathrmab0 23153 nm superconducting carrier density n_s 745 times 1026 m3 and carriers effectivemass m 245textitm_e our zf musr measurements do not reveal a clear sign of time reversal symmetry breaking at t_bf c but the temperature dependent relaxation between 150 k and 12 k might indicate the presence of spinfluctuations the results of our present study have been compared with those reported for other fe pnictide superconductors | [['the', 'superconducting', 'properties', 'of', 'the', 'recently', 'discovered', 'double', 'fe_2as_2', 'layered', 'hight_c', 'superconductor', 'rbca_2fe_4as_4f_2', 'with', 't_capprox', '30k', 'have', 'been', 'investigated', 'using', 'magnetization', 'heat', 'capacity', 'transversefield', 'tf', 'and', 'zerofield', 'zf', 'muonspin', 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1,802.07335 | Performance Comparison of two novel Relay-Assisted Hybrid FSO / RF
Communication Systems | In this manuscript, two novel multi-hop relay-assisted hybrid Free Space
Optical / Radio Frequency (FSO / RF) communication systems are presented and
compared. In these structures, RF and FSO links, at each hop, are parallel and
send data simultaneously. This is the first time that in a multihop hybrid FSO
/ RF structure, Detect and Forward protocol is used. In the first structure, at
each hop, received signals with higher Signal to Noise Ratio (SNR) is selected.
But in the second structure, at each hop, received FSO and RF signals are
separately detected and forwarded and selection is done only at the last hop.
Considering FSO link in Negative Exponential atmospheric turbulence and RF link
in Rayleigh fading, for the first time, closed-form expressions are derived for
Outage Probability (P_out) and Bit Error Rate (BER) of the proposed structures.
MATLAB simulations are provided to verify derived expressions. The main
motivation of this work is to answer this question that how much is the
difference of selection at each hop and selection at the last hop. Results
indicate that the structure with selection at each hop has better performance
than the structure with selection at the last hop. At different target Outage
Probability, selection at the last hop consumes about two times (~3dB) more
power than selection at each hop. Both structures are particularly suitable for
long-range communications. However, selection at each hop, in the cost of more
complexity, is recommended for applications which have problem with supplying
the required power for communication.
| eess.SP | in this manuscript two novel multihop relayassisted hybrid free space optical radio frequency fso rf communication systems are presented and compared in these structures rf and fso links at each hop are parallel and send data simultaneously this is the first time that in a multihop hybrid fso rf structure detect and forward protocol is used in the first structure at each hop received signals with higher signal to noise ratio snr is selected but in the second structure at each hop received fso and rf signals are separately detected and forwarded and selection is done only at the last hop considering fso link in negative exponential atmospheric turbulence and rf link in rayleigh fading for the first time closedform expressions are derived for outage probability p_out and bit error rate ber of the proposed structures matlab simulations are provided to verify derived expressions the main motivation of this work is to answer this question that how much is the difference of selection at each hop and selection at the last hop results indicate that the structure with selection at each hop has better performance than the structure with selection at the last hop at different target outage probability selection at the last hop consumes about two times 3db more power than selection at each hop both structures are particularly suitable for longrange communications however selection at each hop in the cost of more complexity is recommended for applications which have problem with supplying the required power for communication | [['in', 'this', 'manuscript', 'two', 'novel', 'multihop', 'relayassisted', 'hybrid', 'free', 'space', 'optical', 'radio', 'frequency', 'fso', 'rf', 'communication', 'systems', 'are', 'presented', 'and', 'compared', 'in', 'these', 'structures', 'rf', 'and', 'fso', 'links', 'at', 'each', 'hop', 'are', 'parallel', 'and', 'send', 'data', 'simultaneously', 'this', 'is', 'the', 'first', 'time', 'that', 'in', 'a', 'multihop', 'hybrid', 'fso', 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1,802.07336 | Minimal group determinants and the Lind-Lehmer problem for dihedral
groups | We find the minimal non-trivial integer variable group determinant for any
dihedral group of order less than $3.79\times 10^{47}$. We think of this as the
Lind-Lehmer problem for the dihedral group. We give a complete description of
the determinants for some dihedral groups including $D_{2p}$ and $D_{4p}$.
| math.NT | we find the minimal nontrivial integer variable group determinant for any dihedral group of order less than 379times 1047 we think of this as the lindlehmer problem for the dihedral group we give a complete description of the determinants for some dihedral groups including d_2p and d_4p | [['we', 'find', 'the', 'minimal', 'nontrivial', 'integer', 'variable', 'group', 'determinant', 'for', 'any', 'dihedral', 'group', 'of', 'order', 'less', 'than', '379times', '1047', 'we', 'think', 'of', 'this', 'as', 'the', 'lindlehmer', 'problem', 'for', 'the', 'dihedral', 'group', 'we', 'give', 'a', 'complete', 'description', 'of', 'the', 'determinants', 'for', 'some', 'dihedral', 'groups', 'including', 'd_2p', 'and', 'd_4p']] | [-0.19427808670120106, 0.09394629785998, -0.036673058693607645, 0.11605939261563536, -0.13845509485238128, -0.10346314314131935, 0.03748712247858445, 0.37642509776891936, -0.251439862501704, -0.3040842273996936, 0.14881717998327482, -0.2637791136072742, -0.16318083451026016, 0.17628444789184464, -0.053403894416987896, -0.0501065928902891, -0.022312306819690597, 0.1558382575917575, -0.16481932197800941, -0.2286225768452924, 0.3365318325037758, -0.039348678787549336, 0.1202829198911786, 0.02199406741807858, 0.09896433398955398, 0.08640771341613597, -0.020479153319158488, -0.0599858043094476, -0.1530369580982046, 0.08668090677044044, 0.27392196808424263, 0.01637163520273235, 0.18766883180166286, -0.39567036618892515, -0.17420002792754935, 0.21697126945687664, 0.12909818748012186, 0.0806640100147989, -0.03133321164382829, -0.23223080937233237, 0.13497614639086855, -0.2442607039378749, -0.19102211987806691, -0.06363707813951704, 0.09502832314206494, -0.048775795764393275, -0.2321263692393485, 0.05295178492863973, 0.03034150373811523, 0.1550382626346416, -0.009980315508113968, -0.19197118195394675, 0.0233544937438435, 0.1619966853513486, 0.027552202343940735, 0.007466367735630936, 0.03209054754633042, -0.08326312224380672, -0.11290905446641974, 0.46771155372262, 0.016404062355286443, -0.19762299607197445, 0.06962517566151089, -0.1755694258130259, -0.22770232647243474, 0.13394863791763784, 0.10625230548903346, 0.18423886912771398, -0.006624289539953073, 0.0695164128090255, -0.1358733303637968, 0.1514202213535706, 0.054639608658746716, -0.00666883931391769, 0.05620217157734765, 0.08251399238490396, 0.1322328795368473, 0.10506295406570038, 0.036360453441739084, 0.022530269912547536, -0.3673745830025938, -0.24867432723856633, -0.08556583629300198, 0.11031363250480758, -0.16778592125790762, -0.174127391151463, 0.42224575794405406, 0.06578929531905386, 0.11055378000148469, 0.14949217163440254, 0.1388763026230865, 0.06193368726461712, 0.09727628690501054, 0.03905093166977167, 0.0978512965382025, 0.15833052810695436, -0.12531978558335038, -0.2006298414328032, -0.009096526861604717, 0.18227192473908266] |
1,802.07337 | NGC 4051: Black hole mass and photon index-mass accretion rate
correlation | We present a discovery of the correlation between the X-ray spectral (photon)
index and mass accretion rate observed in AGN NGC 4051. We analyzed spectral
transition episodes observed in NGC 4051 using XMM/Newton, Suzaku and RXTE. We
applied a scaling technique for a black hole (BH) mass evaluation which uses a
correlation between the photon index and normalization of the seed (disk)
component, which is proportional to a mass accretion rate. We developed an
analytical model that shows the spectral (photon) index of the BH emergent
spectrum undergoes an evolution from lower to higher values depending on
a mass accretion rate in the accretion disk. We considered Cygnus X-1 and
GRO~J1550-564 as reference sources for which distances, inclination angles and
the BH masses are evaluated by dynamical measurements. Application of the
scaling technique for the photon index-mass accretion rate correlation provides
an estimate of the black hole mass in NGC 4051 to be more than 6x10^5 solar
masses.
| astro-ph.GA astro-ph.HE | we present a discovery of the correlation between the xray spectral photon index and mass accretion rate observed in agn ngc 4051 we analyzed spectral transition episodes observed in ngc 4051 using xmmnewton suzaku and rxte we applied a scaling technique for a black hole bh mass evaluation which uses a correlation between the photon index and normalization of the seed disk component which is proportional to a mass accretion rate we developed an analytical model that shows the spectral photon index of the bh emergent spectrum undergoes an evolution from lower to higher values depending on a mass accretion rate in the accretion disk we considered cygnus x1 and groj1550564 as reference sources for which distances inclination angles and the bh masses are evaluated by dynamical measurements application of the scaling technique for the photon indexmass accretion rate correlation provides an estimate of the black hole mass in ngc 4051 to be more than 6x105 solar masses | [['we', 'present', 'a', 'discovery', 'of', 'the', 'correlation', 'between', 'the', 'xray', 'spectral', 'photon', 'index', 'and', 'mass', 'accretion', 'rate', 'observed', 'in', 'agn', 'ngc', '4051', 'we', 'analyzed', 'spectral', 'transition', 'episodes', 'observed', 'in', 'ngc', '4051', 'using', 'xmmnewton', 'suzaku', 'and', 'rxte', 'we', 'applied', 'a', 'scaling', 'technique', 'for', 'a', 'black', 'hole', 'bh', 'mass', 'evaluation', 'which', 'uses', 'a', 'correlation', 'between', 'the', 'photon', 'index', 'and', 'normalization', 'of', 'the', 'seed', 'disk', 'component', 'which', 'is', 'proportional', 'to', 'a', 'mass', 'accretion', 'rate', 'we', 'developed', 'an', 'analytical', 'model', 'that', 'shows', 'the', 'spectral', 'photon', 'index', 'of', 'the', 'bh', 'emergent', 'spectrum', 'undergoes', 'an', 'evolution', 'from', 'lower', 'to', 'higher', 'values', 'depending', 'on', 'a', 'mass', 'accretion', 'rate', 'in', 'the', 'accretion', 'disk', 'we', 'considered', 'cygnus', 'x1', 'and', 'groj1550564', 'as', 'reference', 'sources', 'for', 'which', 'distances', 'inclination', 'angles', 'and', 'the', 'bh', 'masses', 'are', 'evaluated', 'by', 'dynamical', 'measurements', 'application', 'of', 'the', 'scaling', 'technique', 'for', 'the', 'photon', 'indexmass', 'accretion', 'rate', 'correlation', 'provides', 'an', 'estimate', 'of', 'the', 'black', 'hole', 'mass', 'in', 'ngc', '4051', 'to', 'be', 'more', 'than', '6x105', 'solar', 'masses']] | [-0.09280754715592784, 0.07968208290869, -0.09101907017338239, 0.13888384090813624, -0.06490897762167985, -0.10045819396411133, 0.047042695602259724, 0.437043514363705, -0.12225051461511356, -0.34545975324407124, 0.06922142718960146, -0.3054309229301229, -0.005023854750929294, 0.2672764220924538, -0.015231871496957199, 0.01374962029151491, 0.01258928233840663, -0.05932724502851154, -0.09607677737689892, -0.18981022272069173, 0.3040267535467531, 0.1080326941220244, 0.17356068298671465, -0.00013128274185642314, 0.0945074165975497, -0.043695952022045174, -0.01799600245134466, -0.0663446639753451, -0.17286661846117765, 0.03565634112615304, 0.19982848852979623, 0.12104973194017342, 0.1873769290288495, -0.28298810149756537, -0.1968793293140876, 0.03353618951306744, 0.19755329143338998, -0.022426857926681115, -0.10039023485505186, -0.21513038187637734, 0.03455695351229826, -0.29879511988300617, -0.13880473074865093, 0.07582905423489346, 0.06699840357277993, -0.028401303686391398, -0.2911868276471972, 0.1935122713600849, 0.008448306649625242, -0.0024573816205997754, -0.16769707124312497, -0.017896089770321016, -0.05713321421603868, 0.09220600011313607, 0.11580402810188829, 0.049233815220487157, 0.21596905492412247, -0.09853650773074596, -0.09467808410983568, 0.3238409904223291, -0.0782228046302442, -0.02065540035403553, 0.16036651983477507, -0.23126527474552488, -0.15804385557877504, 0.14728277789541538, 0.16891010686945004, 0.13522346265269977, -0.1373203927055068, -0.00011629805639983084, -0.03207288362133275, 0.32357783899731507, 0.05462216502974984, 0.059126072613652915, 0.32003820228248026, 0.10056773474170073, 0.013723184164779582, 0.13162590560257126, -0.23211385214042843, -0.043547267414582, -0.20234027196457433, -0.08840101932406805, -0.16812326845558728, 0.14584025861636088, -0.19709493185993757, -0.11976317577560841, 0.353855782292285, 0.08190067124903012, 0.26401958615237175, 0.026778051771288797, 0.3009821498902977, 0.14690296277018253, 0.058541462682543476, 0.1565598924792591, 0.3330996427981622, 0.18553420076306887, 0.10455381570704234, -0.28177243364666393, 0.033290006852097764, 0.07439051726892305] |
1,802.07338 | Fertilizer usage and cadmium in soils, crops and food | Phosphate fertilizers were first implicated by Schroeder and Balassa in 1963
for increasing the Cd concentration in cultivated soils and crops. This
suggestion has become a part of the accepted paradigm on soil toxicity.
Consequently, stringent fertilizer control programs to monitor Cd have been
launched. Attempts to link Cd toxicity and fertilizers to chronic diseases are
common. A re-assessment of this "accepted" paradigm is timely, given the larger
body of data available today. The data show that both the input and output of
Cd per hectare from fertilizers are negligibly small compared to the total
amount of Cd/hectare usually present in the soil itself. Calculations based on
current agricultural practices are used to show that it will take about 18
centuries to double the ambient soil-cadmium level, and about 8 centuries to
double the soil-fluoride level, even after neglecting leaching and other
removal effects. Hence the concern of long-term agriculture should be the
depletion of available phosphate fertilizers, rather than the contamination of
the soil by trace metals or fluoride. This conclusion is confirmed by showing
that the claimed correlations between fertilizer input and cadmium accumulation
in crops are not robust. Alternative scenarios that explain the data are
examined. Thus soil acidulation on fertilizer loading, and the effect of
magnesium, zinc, and fluoride ions contained in fertilizers are considered
using recent Cd$^{2+}$, Mg$^{2+}$ and F$^-$ ion-association theories. The
protective role of ions like Zn, Se, Fe, etc., is emphasized, and the question
of cadmium toxicity in the presence of other ions is considered. These help to
clarify and rectify difficulties found in the standard point of view. This
analysis does not modify the accepted views on Cd contamination by airborne
delivery, smoking, and industrial activity, or P-contamination causing algal
blooms.
| q-bio.TO | phosphate fertilizers were first implicated by schroeder and balassa in 1963 for increasing the cd concentration in cultivated soils and crops this suggestion has become a part of the accepted paradigm on soil toxicity consequently stringent fertilizer control programs to monitor cd have been launched attempts to link cd toxicity and fertilizers to chronic diseases are common a reassessment of this accepted paradigm is timely given the larger body of data available today the data show that both the input and output of cd per hectare from fertilizers are negligibly small compared to the total amount of cdhectare usually present in the soil itself calculations based on current agricultural practices are used to show that it will take about 18 centuries to double the ambient soilcadmium level and about 8 centuries to double the soilfluoride level even after neglecting leaching and other removal effects hence the concern of longterm agriculture should be the depletion of available phosphate fertilizers rather than the contamination of the soil by trace metals or fluoride this conclusion is confirmed by showing that the claimed correlations between fertilizer input and cadmium accumulation in crops are not robust alternative scenarios that explain the data are examined thus soil acidulation on fertilizer loading and the effect of magnesium zinc and fluoride ions contained in fertilizers are considered using recent cd2 mg2 and f ionassociation theories the protective role of ions like zn se fe etc is emphasized and the question of cadmium toxicity in the presence of other ions is considered these help to clarify and rectify difficulties found in the standard point of view this analysis does not modify the accepted views on cd contamination by airborne delivery smoking and industrial activity or pcontamination causing algal blooms | [['phosphate', 'fertilizers', 'were', 'first', 'implicated', 'by', 'schroeder', 'and', 'balassa', 'in', '1963', 'for', 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1,802.07339 | Exclusive and diffractive $\mu^+ \mu^-$ production in $pp$ collisions at
the LHC | In this paper we estimate the production of dimuons ($\mu^+ \mu^-$) in
exclusive photon -- photon ($\gamma \gamma$) and diffractive Pomeron - Pomeron
$(I\!P I\!P)$, Pomeron - Reggeon $(I\!P I\!R)$ and Reggeon - Reggeon $(I\!R
I\!R)$ interactions in $pp$ collisions at the LHC energy. The invariant mass,
rapidity and tranverse momentum distributions are calculated using the Forward
Physics Monte Carlo (FPMC), which allows to obtain realistic predictions for
the dimuon production with two leading intact hadrons. In particular,
predictions taking into account the CMS and LHCb acceptances are presented.
Moreover, the contribution of the single diffraction for the dimuon production
also is estimated. Our results demonstrate that the experimental separation of
these different mechanisms is feasible. In particular, the events characterized
by pairs with large squared transverse momentum are dominated by diffractive
interactions, which allows to investigate the underlying assumptions present in
the description of these processes.
| hep-ph hep-ex | in this paper we estimate the production of dimuons mu mu in exclusive photon photon gamma gamma and diffractive pomeron pomeron ip ip pomeron reggeon ip ir and reggeon reggeon ir ir interactions in pp collisions at the lhc energy the invariant mass rapidity and tranverse momentum distributions are calculated using the forward physics monte carlo fpmc which allows to obtain realistic predictions for the dimuon production with two leading intact hadrons in particular predictions taking into account the cms and lhcb acceptances are presented moreover the contribution of the single diffraction for the dimuon production also is estimated our results demonstrate that the experimental separation of these different mechanisms is feasible in particular the events characterized by pairs with large squared transverse momentum are dominated by diffractive interactions which allows to investigate the underlying assumptions present in the description of these processes | [['in', 'this', 'paper', 'we', 'estimate', 'the', 'production', 'of', 'dimuons', 'mu', 'mu', 'in', 'exclusive', 'photon', 'photon', 'gamma', 'gamma', 'and', 'diffractive', 'pomeron', 'pomeron', 'ip', 'ip', 'pomeron', 'reggeon', 'ip', 'ir', 'and', 'reggeon', 'reggeon', 'ir', 'ir', 'interactions', 'in', 'pp', 'collisions', 'at', 'the', 'lhc', 'energy', 'the', 'invariant', 'mass', 'rapidity', 'and', 'tranverse', 'momentum', 'distributions', 'are', 'calculated', 'using', 'the', 'forward', 'physics', 'monte', 'carlo', 'fpmc', 'which', 'allows', 'to', 'obtain', 'realistic', 'predictions', 'for', 'the', 'dimuon', 'production', 'with', 'two', 'leading', 'intact', 'hadrons', 'in', 'particular', 'predictions', 'taking', 'into', 'account', 'the', 'cms', 'and', 'lhcb', 'acceptances', 'are', 'presented', 'moreover', 'the', 'contribution', 'of', 'the', 'single', 'diffraction', 'for', 'the', 'dimuon', 'production', 'also', 'is', 'estimated', 'our', 'results', 'demonstrate', 'that', 'the', 'experimental', 'separation', 'of', 'these', 'different', 'mechanisms', 'is', 'feasible', 'in', 'particular', 'the', 'events', 'characterized', 'by', 'pairs', 'with', 'large', 'squared', 'transverse', 'momentum', 'are', 'dominated', 'by', 'diffractive', 'interactions', 'which', 'allows', 'to', 'investigate', 'the', 'underlying', 'assumptions', 'present', 'in', 'the', 'description', 'of', 'these', 'processes']] | [-0.06429092379993519, 0.22903457340960215, -0.13190453354728415, 0.18279824471443085, -0.025212196730910897, -0.09902501573226044, 0.006893838121607847, 0.368120507687213, -0.23184018194271655, -0.2649477233709702, -0.06276926561258733, -0.34274386149897057, 0.024973698834305745, 0.12587708612526213, 0.0719461416161352, 0.09476478083280625, 0.09924793597375908, -0.03825868160782994, -0.014662020001234812, -0.16991727376500002, 0.32804855677279665, 0.05725909600203687, 0.22664580810359203, 0.16489217017445115, 0.07806656349098662, 0.138162008406907, -0.09732051448403187, -0.04189138611863283, -0.13933923892812988, 0.08288122811114539, 0.28438255339502716, 0.024637985030202182, 0.09990582771768625, -0.360953947880885, -0.10720914141828572, 0.09730332418038816, 0.16742248366541274, 0.035689630283537756, -0.0506216941232031, -0.2671150892282595, 0.10935777253503878, -0.21702651129840136, -0.08648281336690371, -0.06264497252780345, -0.017911896581755026, -0.0007255238031486531, -0.3466089387616416, 0.06574487077683647, -0.04650750977290026, 0.0006035091469416043, -0.023120612974955955, -0.16029712890919584, -0.07982610629291853, 0.04797862545046565, 0.11957801293852004, 0.08123447971705061, 0.17310552609192167, -0.15690178709663125, -0.21437070138387745, 0.33459274761925833, 0.022836527272642074, -0.1760907720292469, 0.16705333406327072, -0.21757829655938737, -0.14034116063983396, 0.19594111650452747, 0.2103023705255058, 0.06930187362420431, -0.24750470592790133, 0.1307154991843093, 0.02255018211744882, 0.13053807108239693, 0.06631280735486766, 0.10201623742843138, 0.16507233263944257, 0.20859558332932893, -0.07603914642354825, 0.08157679390071051, -0.16575791681074648, -0.12826486788543554, -0.4287358688685548, -0.09500202242044041, -0.09539887961000204, 0.05332050434561199, -0.09121888678910055, -0.06395397277978751, 0.3264590520997877, 0.11426727118302736, 0.27382886820062474, 0.02064022820742501, 0.34665019382312373, 0.13787161981258736, 0.059585897040299395, 0.0756172770813394, 0.3009693664466063, 0.13142929528677066, 0.17960836902469188, -0.2408840496262366, 0.04971427349308571, 0.052590562734049516] |
1,802.0734 | Influence of non-linearity of medium on the laser induced filamentation
instability in magnetized plasma | The effects of the non-linearity of the medium on the growth rate of
filamentation instability in a magnetized plasma interacting with an intense
laser pulse, is investigated. The non-linearity of the medium, modeled by Kerr
non-linearity, is an important factor, which determines the rate of instability
growth. Sensitivity of the rate of filamentation growth, to the Kerr non-linear
coefficient could be adjusted by the external magnetic field and laser
intensity.
| physics.plasm-ph physics.optics | the effects of the nonlinearity of the medium on the growth rate of filamentation instability in a magnetized plasma interacting with an intense laser pulse is investigated the nonlinearity of the medium modeled by kerr nonlinearity is an important factor which determines the rate of instability growth sensitivity of the rate of filamentation growth to the kerr nonlinear coefficient could be adjusted by the external magnetic field and laser intensity | [['the', 'effects', 'of', 'the', 'nonlinearity', 'of', 'the', 'medium', 'on', 'the', 'growth', 'rate', 'of', 'filamentation', 'instability', 'in', 'a', 'magnetized', 'plasma', 'interacting', 'with', 'an', 'intense', 'laser', 'pulse', 'is', 'investigated', 'the', 'nonlinearity', 'of', 'the', 'medium', 'modeled', 'by', 'kerr', 'nonlinearity', 'is', 'an', 'important', 'factor', 'which', 'determines', 'the', 'rate', 'of', 'instability', 'growth', 'sensitivity', 'of', 'the', 'rate', 'of', 'filamentation', 'growth', 'to', 'the', 'kerr', 'nonlinear', 'coefficient', 'could', 'be', 'adjusted', 'by', 'the', 'external', 'magnetic', 'field', 'and', 'laser', 'intensity']] | [-0.19859686918623212, 0.19218124964515612, -0.030580621478813037, 0.006655335000583104, -0.03973780771983521, -0.05758429492956826, -0.0727486317644694, 0.36059265565792364, -0.2834980615281633, -0.23917992732354573, 0.091888904370301, -0.23139261204549777, -0.06682467217823225, 0.248587214228298, 0.016825597932828323, 0.04885063466749021, -0.06154079078197745, -0.011972644725548369, 0.07475952489434608, -0.22034950444607862, 0.3497962195093611, 0.1765940357332251, 0.31459242150719674, 0.033044368401169776, 0.09638035516587219, -0.01616957489667194, 0.03318967425397464, -0.01805982757359743, -0.16017485623243763, 0.028732863574155738, 0.12565041573252528, 0.021747914385715765, 0.31415155629760455, -0.45120063134069954, -0.29605615036562083, -0.0015842151695064136, 0.13557956808113625, 0.11506363374813061, -0.12330154873197899, -0.2552117868060512, -0.017817923333495855, -0.1131572089823229, -0.18813838995327906, 0.03180551402536886, 0.028515192142887308, 0.11076610749504263, -0.3686304993927479, 0.11140696514131768, 0.09115734580638153, 0.018993915058672428, -0.058520149266613385, 0.05801327593092408, -0.06245581465108054, 0.009591012707512293, 0.09570662450444485, 0.06877621732918279, 0.22116134289785155, -0.21755482527826514, -0.03372143300782357, 0.369648606103978, -0.1354263687373272, -0.114979846190129, 0.13399081240807262, -0.2424472750962845, 0.049096913821995256, 0.2260122231274311, 0.2282836921679388, 0.1111398234963417, -0.09849816375145955, 0.02197482271835075, 0.039279112798560945, 0.22967664671928756, 0.1550025831043188, 0.052421067468822004, 0.20274268742650747, 0.23845886931355512, 0.0055647508573851414, 0.169913072516543, -0.058566859241441956, -0.003628135845065117, -0.2508676844782063, -0.0726388182358018, -0.14257339835166932, 0.09582962790238006, -0.1534698450603173, -0.13699631514526636, 0.4067942348109292, 0.11055301603462014, 0.11194742862800403, -0.12533924853861597, 0.2964309730433992, 0.2216658527098064, 0.04675261359661818, 0.02975855735130608, 0.3648681720984834, 0.19216491343852665, 0.09416015965731016, -0.3494786244883601, 0.08266550333771322, 0.011371201369911432] |
1,802.07341 | An entropy stable nodal discontinuous Galerkin method for the resistive
MHD equations. Part I: Theory and Numerical Verification | The first paper of this series presents a discretely entropy stable
discontinuous Galerkin (DG) method for the resistive magnetohydrodynamics (MHD)
equations on three-dimensional curvilinear unstructured hexahedral meshes.
Compared to other fluid dynamics systems such as the shallow water equations or
the compressible Navier-Stokes equations, the resistive MHD equations need
special considerations because of the divergence-free constraint on the
magnetic field. For instance, it is well known that for the symmetrization of
the ideal MHD system as well as the continuous entropy analysis a
non-conservative term proportional to the divergence of the magnetic field,
typically referred to as the Powell term, must be included. As a consequence,
the mimicry of the continuous entropy analysis in the discrete sense demands a
suitable DG approximation of the non-conservative terms in addition to the
ideal MHD terms.
This paper focuses on the resistive MHD equations: Our first contribution is
a proof that the resistive terms are symmetric and positive-definite when
formulated in entropy space as gradients of the entropy variables. This enables
us to show that the entropy inequality holds for the resistive MHD equations.
This continuous analysis is the key for our DG discretization and guides the
path for the construction of an approximation that discretely mimics the
entropy inequality, typically termed entropy stability. Our second contribution
is a detailed derivation and analysis of the discretization on
three-dimensional curvilinear meshes. The discrete analysis relies on the
summation-by-parts property, which is satisfied by the DG spectral element
method (DGSEM) with Legendre-Gauss-Lobatto (LGL) nodes. Although the
divergence-free constraint is included in the non-conservative terms, the
resulting method has no particular treatment of the magnetic field divergence
errors...
| math.NA | the first paper of this series presents a discretely entropy stable discontinuous galerkin dg method for the resistive magnetohydrodynamics mhd equations on threedimensional curvilinear unstructured hexahedral meshes compared to other fluid dynamics systems such as the shallow water equations or the compressible navierstokes equations the resistive mhd equations need special considerations because of the divergencefree constraint on the magnetic field for instance it is well known that for the symmetrization of the ideal mhd system as well as the continuous entropy analysis a nonconservative term proportional to the divergence of the magnetic field typically referred to as the powell term must be included as a consequence the mimicry of the continuous entropy analysis in the discrete sense demands a suitable dg approximation of the nonconservative terms in addition to the ideal mhd terms this paper focuses on the resistive mhd equations our first contribution is a proof that the resistive terms are symmetric and positivedefinite when formulated in entropy space as gradients of the entropy variables this enables us to show that the entropy inequality holds for the resistive mhd equations this continuous analysis is the key for our dg discretization and guides the path for the construction of an approximation that discretely mimics the entropy inequality typically termed entropy stability our second contribution is a detailed derivation and analysis of the discretization on threedimensional curvilinear meshes the discrete analysis relies on the summationbyparts property which is satisfied by the dg spectral element method dgsem with legendregausslobatto lgl nodes although the divergencefree constraint is included in the nonconservative terms the resulting method has no particular treatment of the magnetic field divergence errors | [['the', 'first', 'paper', 'of', 'this', 'series', 'presents', 'a', 'discretely', 'entropy', 'stable', 'discontinuous', 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1,802.07342 | A joint decomposition method for global optimization of multiscenario
nonconvex mixed-integer nonlinear programs | This paper proposes a joint decomposition method that combines La- grangian
decomposition and generalized Benders decomposition, to efficiently solve
multiscenario nonconvex mixed-integer nonlinear programming (MINLP) problems to
global optimality, without the need for explicit branch and bound search. In
this approach, we view the variables coupling the scenario dependent variables
and those causing nonconvexity as complicating variables. We systemat- ically
solve the Lagrangian decomposition subproblems and the generalized Ben- ders
decomposition subproblems in a unified framework. The method requires the
solution of a difficult relaxed master problem, but the problem is only solved
when necessary. Enhancements to the method are made to reduce the number of the
relaxed master problems to be solved and ease the solution of each relaxed
master problem. We consider two scenario-based, two-stage stochastic nonconvex
MINLP problems that arise from integrated design and operation of process net-
works in the case study, and we show that the proposed method can solve the two
problems significantly faster than state-of-the-art global optimization
solvers.
| math.OC | this paper proposes a joint decomposition method that combines la grangian decomposition and generalized benders decomposition to efficiently solve multiscenario nonconvex mixedinteger nonlinear programming minlp problems to global optimality without the need for explicit branch and bound search in this approach we view the variables coupling the scenario dependent variables and those causing nonconvexity as complicating variables we systemat ically solve the lagrangian decomposition subproblems and the generalized ben ders decomposition subproblems in a unified framework the method requires the solution of a difficult relaxed master problem but the problem is only solved when necessary enhancements to the method are made to reduce the number of the relaxed master problems to be solved and ease the solution of each relaxed master problem we consider two scenariobased twostage stochastic nonconvex minlp problems that arise from integrated design and operation of process net works in the case study and we show that the proposed method can solve the two problems significantly faster than stateoftheart global optimization solvers | [['this', 'paper', 'proposes', 'a', 'joint', 'decomposition', 'method', 'that', 'combines', 'la', 'grangian', 'decomposition', 'and', 'generalized', 'benders', 'decomposition', 'to', 'efficiently', 'solve', 'multiscenario', 'nonconvex', 'mixedinteger', 'nonlinear', 'programming', 'minlp', 'problems', 'to', 'global', 'optimality', 'without', 'the', 'need', 'for', 'explicit', 'branch', 'and', 'bound', 'search', 'in', 'this', 'approach', 'we', 'view', 'the', 'variables', 'coupling', 'the', 'scenario', 'dependent', 'variables', 'and', 'those', 'causing', 'nonconvexity', 'as', 'complicating', 'variables', 'we', 'systemat', 'ically', 'solve', 'the', 'lagrangian', 'decomposition', 'subproblems', 'and', 'the', 'generalized', 'ben', 'ders', 'decomposition', 'subproblems', 'in', 'a', 'unified', 'framework', 'the', 'method', 'requires', 'the', 'solution', 'of', 'a', 'difficult', 'relaxed', 'master', 'problem', 'but', 'the', 'problem', 'is', 'only', 'solved', 'when', 'necessary', 'enhancements', 'to', 'the', 'method', 'are', 'made', 'to', 'reduce', 'the', 'number', 'of', 'the', 'relaxed', 'master', 'problems', 'to', 'be', 'solved', 'and', 'ease', 'the', 'solution', 'of', 'each', 'relaxed', 'master', 'problem', 'we', 'consider', 'two', 'scenariobased', 'twostage', 'stochastic', 'nonconvex', 'minlp', 'problems', 'that', 'arise', 'from', 'integrated', 'design', 'and', 'operation', 'of', 'process', 'net', 'works', 'in', 'the', 'case', 'study', 'and', 'we', 'show', 'that', 'the', 'proposed', 'method', 'can', 'solve', 'the', 'two', 'problems', 'significantly', 'faster', 'than', 'stateoftheart', 'global', 'optimization', 'solvers']] | [-0.10581036805169566, -0.049382408163737415, -0.10067090955449313, 0.08883279115329193, -0.1621157840893763, -0.17899016152056524, 0.05651115614668148, 0.33510131656941844, -0.37465969283558237, -0.34396522506935207, 0.13851005985243983, -0.20103929535394943, -0.18055195803186153, 0.16399821700391973, -0.09269778949503855, 0.0982190831394003, 0.11114105921829255, -0.09342522511440443, -0.10283899002157651, -0.27116269628210676, 0.25866156954335323, -0.020356143542236034, 0.2800078333537208, 0.010444360768149903, 0.15923150179328444, 0.02143398392945528, 0.001743482068044747, 0.0628577781821283, -0.06310311724816374, 0.14077250244700712, 0.29814821697498967, 0.21086902486262615, 0.3541709634747992, -0.46122916663497143, -0.17000206243019642, 0.12926762763243282, 0.16970593937961584, 0.10393112833702528, 0.008705178701614098, -0.2164503493198625, 0.0746301477448447, -0.1349959214066763, -0.09843435466130514, -0.09505765352869497, -0.08351708590280174, -0.05404563194918787, -0.3340800410908897, 0.08204413116920212, 0.044319032765243474, -0.07044044637302982, -0.11504379902233756, -0.16764825731004793, 0.058631681132970785, 0.017843609823946126, 0.03689768996636991, 0.008136848039590049, 0.0887176268691447, -0.0886883143415084, -0.12803111536848563, 0.37485070763405687, -0.011419956585574787, -0.26309908502280893, 0.14521768090539475, 0.0031411207917078237, -0.1762300430251876, 0.13852952125414117, 0.2350423141083078, 0.21394593591046543, -0.20438055686907142, 0.10078119537147137, -0.03296672228848698, 0.12923917298456483, 0.04826447576221942, -0.045005298648370294, 0.10066614408158163, 0.1610369241325094, 0.1621735742849457, 0.195173185014183, 0.006494375254544316, -0.1462958707224305, -0.23451137405581682, -0.10903140110961586, -0.14541364822071046, -0.038479837314963974, -0.08987261859138237, -0.12572533311322331, 0.37322513243927413, 0.16644504431929463, 0.11932735986689605, 0.09197591686984752, 0.3354081500367057, 0.18754173040023733, 0.040134019027790624, 0.10920833308738088, 0.19036002056218865, 0.1300846366240166, 0.12594747773468176, -0.28214102601149776, 0.028401876972965534, 0.13151877724122618] |
1,802.07343 | Mass functions from the excursion set model | Aims. We aim to study the stochastic evolution of the smoothed overdensity
$\delta$ at scale $S$ of the form $\delta(S) = \int_{0}^S
K(S,u)\mathrm{d}W(u)$, where $K$ is a kernel and $\mathrm{d}W$ is the usual
Wiener process. Methods. For a Gaussian density field, smoothed by the top-hat
filter, in real space, we used a simple kernel that gives the correct
correlation between scales. A Monte Carlo procedure was used to construct
random walks and to calculate first crossing distributions and consequently
mass functions for a constant barrier. Results. We show that the evolution
considered here improves the agreement with the results of N-body simulations
relative to analytical approximations which have been proposed from the same
problem by other authors. In fact, we show that an evolution which is fully
consistent with the ideas of the excursion set model, describes accurately the
mass function of dark matter haloes for values of $\nu \leq 1$ and
underestimates the number of larger haloes. Finally, we show that a constant
threshold of collapse, lower than it is usually used, it is able to produce a
mass function which approximates the results of N-body simulations for a
variety of redshifts and for a wide range of masses. Conclusions. A mass
function in good agreement with N-body simulations can be obtained analytically
using a lower than usual constant collapse threshold.
| astro-ph.CO | aims we aim to study the stochastic evolution of the smoothed overdensity delta at scale s of the form deltas int_0s ksumathrmdwu where k is a kernel and mathrmdw is the usual wiener process methods for a gaussian density field smoothed by the tophat filter in real space we used a simple kernel that gives the correct correlation between scales a monte carlo procedure was used to construct random walks and to calculate first crossing distributions and consequently mass functions for a constant barrier results we show that the evolution considered here improves the agreement with the results of nbody simulations relative to analytical approximations which have been proposed from the same problem by other authors in fact we show that an evolution which is fully consistent with the ideas of the excursion set model describes accurately the mass function of dark matter haloes for values of nu leq 1 and underestimates the number of larger haloes finally we show that a constant threshold of collapse lower than it is usually used it is able to produce a mass function which approximates the results of nbody simulations for a variety of redshifts and for a wide range of masses conclusions a mass function in good agreement with nbody simulations can be obtained analytically using a lower than usual constant collapse threshold | [['aims', 'we', 'aim', 'to', 'study', 'the', 'stochastic', 'evolution', 'of', 'the', 'smoothed', 'overdensity', 'delta', 'at', 'scale', 's', 'of', 'the', 'form', 'deltas', 'int_0s', 'ksumathrmdwu', 'where', 'k', 'is', 'a', 'kernel', 'and', 'mathrmdw', 'is', 'the', 'usual', 'wiener', 'process', 'methods', 'for', 'a', 'gaussian', 'density', 'field', 'smoothed', 'by', 'the', 'tophat', 'filter', 'in', 'real', 'space', 'we', 'used', 'a', 'simple', 'kernel', 'that', 'gives', 'the', 'correct', 'correlation', 'between', 'scales', 'a', 'monte', 'carlo', 'procedure', 'was', 'used', 'to', 'construct', 'random', 'walks', 'and', 'to', 'calculate', 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1,802.07344 | Coconut: Threshold Issuance Selective Disclosure Credentials with
Applications to Distributed Ledgers | Coconut is a novel selective disclosure credential scheme supporting
distributed threshold issuance, public and private attributes,
re-randomization, and multiple unlinkable selective attribute revelations.
Coconut integrates with blockchains to ensure confidentiality, authenticity and
availability even when a subset of credential issuing authorities are malicious
or offline. We implement and evaluate a generic Coconut smart contract library
for Chainspace and Ethereum; and present three applications related to
anonymous payments, electronic petitions, and distribution of proxies for
censorship resistance. Coconut uses short and computationally efficient
credentials, and our evaluation shows that most Coconut cryptographic
primitives take just a few milliseconds on average, with verification taking
the longest time (10 milliseconds).
| cs.CR | coconut is a novel selective disclosure credential scheme supporting distributed threshold issuance public and private attributes rerandomization and multiple unlinkable selective attribute revelations coconut integrates with blockchains to ensure confidentiality authenticity and availability even when a subset of credential issuing authorities are malicious or offline we implement and evaluate a generic coconut smart contract library for chainspace and ethereum and present three applications related to anonymous payments electronic petitions and distribution of proxies for censorship resistance coconut uses short and computationally efficient credentials and our evaluation shows that most coconut cryptographic primitives take just a few milliseconds on average with verification taking the longest time 10 milliseconds | [['coconut', 'is', 'a', 'novel', 'selective', 'disclosure', 'credential', 'scheme', 'supporting', 'distributed', 'threshold', 'issuance', 'public', 'and', 'private', 'attributes', 'rerandomization', 'and', 'multiple', 'unlinkable', 'selective', 'attribute', 'revelations', 'coconut', 'integrates', 'with', 'blockchains', 'to', 'ensure', 'confidentiality', 'authenticity', 'and', 'availability', 'even', 'when', 'a', 'subset', 'of', 'credential', 'issuing', 'authorities', 'are', 'malicious', 'or', 'offline', 'we', 'implement', 'and', 'evaluate', 'a', 'generic', 'coconut', 'smart', 'contract', 'library', 'for', 'chainspace', 'and', 'ethereum', 'and', 'present', 'three', 'applications', 'related', 'to', 'anonymous', 'payments', 'electronic', 'petitions', 'and', 'distribution', 'of', 'proxies', 'for', 'censorship', 'resistance', 'coconut', 'uses', 'short', 'and', 'computationally', 'efficient', 'credentials', 'and', 'our', 'evaluation', 'shows', 'that', 'most', 'coconut', 'cryptographic', 'primitives', 'take', 'just', 'a', 'few', 'milliseconds', 'on', 'average', 'with', 'verification', 'taking', 'the', 'longest', 'time', '10', 'milliseconds']] | [-0.20518439324468235, -0.01883424546517362, -0.040542417562732073, 0.07626363655626252, -0.12656888659068635, -0.29063763467716835, 0.1705782713398999, 0.40159666880303735, -0.24202957869154862, -0.3094688809311418, 0.15795299162322254, -0.30389502244810007, -0.053871169053105135, 0.19059816093149237, -0.1299216519414543, 0.07225442601685525, 0.05972154465015481, -0.026191877653804894, 0.04050725087453829, -0.30508035947089995, 0.24570570075824621, 0.04883342674089091, 0.33567088276635265, 0.10021740123281413, 0.08569730839596312, 0.0557973029997165, -0.056342824710376355, -0.05831783012678481, -0.028953848832417996, 0.1140683984849602, 0.30902355080731564, 0.25896286100549537, 0.3775251624623213, -0.4281332283063191, -0.10876925325752279, 0.052971179354457165, 0.07524307139536636, 0.09478878945756321, -0.08574363709727703, -0.2907281548185187, 0.1557727998261836, -0.3145249029447403, -0.034052462826230534, -0.13986578553688722, 0.013204014610399049, 0.030886338488416414, -0.283014066700136, -0.011375562556601503, -0.04451481508369619, 0.11244295500915184, -0.02154047947994947, -0.05492547423378608, -0.013532871282528912, 0.1872967645913802, 0.014628057351779784, -0.027218295944523865, 0.20326703136338564, -0.07446709499963958, -0.16689987444954218, 0.36895813322930693, 0.017984687973022738, -0.09180068262095485, 0.16757379551244048, 0.035822880489177235, -0.1554625438978878, 0.06866315577318456, 0.19294974537322593, 0.12961689749662983, -0.17553126573778588, -0.031437318968460415, -0.021554192153858804, 0.26280439270782135, 0.08221424033399671, 0.07220360810354909, 0.18376836939236132, 0.16162853359209947, 0.06148625267713078, 0.10498688536670024, -0.044070594132416575, -0.12303415744208565, -0.2163811989567051, -0.16755356908793273, -0.12382284623884082, 0.026049358810507038, -0.08729647019337841, -0.172849678870717, 0.35889836511188855, 0.21732760379177946, 0.10470169543279945, 0.10820022301104303, 0.4005930315633522, -0.05304784290644854, 0.11920939363260692, 0.18233286769120632, 0.09821674442266888, -0.05000465623512168, 0.1431045844741862, -0.11489253624768875, 0.2390946958161821, 0.010217870516804804] |
1,802.07345 | On a class of solutions to the generalized KdV type equation | We consider the IVP associated to the generalized KdV equation with low
degree of non-linearity \begin{equation*} \partial_t u + \partial_x^3 u \pm
|u|^{\alpha}\partial_x u = 0,\; x,t \in \mathbb{R},\;\alpha \in (0,1).
\end{equation*} By using an argument similar to that introduced by Cazenave and
Naumkin [2] we establish the local well-posedness for a class of data in an
appropriate weighted Sobolev space. Also, we show that the solutions obtained
satisfy the propagation of regularity principle proven in [3] in solutions of
the $k$-generalized KdV equation.
| math.AP | we consider the ivp associated to the generalized kdv equation with low degree of nonlinearity beginequation partial_t u partial_x3 u pm ualphapartial_x u 0 xt in mathbbralpha in 01 endequation by using an argument similar to that introduced by cazenave and naumkin 2 we establish the local wellposedness for a class of data in an appropriate weighted sobolev space also we show that the solutions obtained satisfy the propagation of regularity principle proven in 3 in solutions of the kgeneralized kdv equation | [['we', 'consider', 'the', 'ivp', 'associated', 'to', 'the', 'generalized', 'kdv', 'equation', 'with', 'low', 'degree', 'of', 'nonlinearity', 'beginequation', 'partial_t', 'u', 'partial_x3', 'u', 'pm', 'ualphapartial_x', 'u', '0', 'xt', 'in', 'mathbbralpha', 'in', '01', 'endequation', 'by', 'using', 'an', 'argument', 'similar', 'to', 'that', 'introduced', 'by', 'cazenave', 'and', 'naumkin', '2', 'we', 'establish', 'the', 'local', 'wellposedness', 'for', 'a', 'class', 'of', 'data', 'in', 'an', 'appropriate', 'weighted', 'sobolev', 'space', 'also', 'we', 'show', 'that', 'the', 'solutions', 'obtained', 'satisfy', 'the', 'propagation', 'of', 'regularity', 'principle', 'proven', 'in', '3', 'in', 'solutions', 'of', 'the', 'kgeneralized', 'kdv', 'equation']] | [-0.16837216284173198, 0.03789705188121187, -0.01441195913696591, 0.07598247027755538, -0.043854351547440586, -0.15345395400625053, -0.0386775640440704, 0.27237500844499735, -0.3606518980917297, -0.19685438471917016, 0.10568465849036893, -0.342078054488837, -0.11143558102223693, 0.15902597597458318, -0.07903080933456179, 0.09728844292886273, 0.024061049252182623, 0.03279224398864221, -0.0770452176957521, -0.21896981827390108, 0.3768977292141394, -0.12054320249288002, 0.18701201421503402, 0.013183306808335871, 0.1578085241902655, -0.005446732598297958, 0.05451076234914834, -0.039994069852916335, -0.2917412482682819, 0.04987024275373809, 0.20430339123947616, 0.06024538519456275, 0.3298162653971511, -0.39757954810239093, -0.19147334928046675, 0.16269199334415077, 0.15155665511619063, 0.002626768920476301, -0.01865527774443072, -0.3603501114522732, 0.13470365369657078, -0.08929783016715134, -0.26188539812647843, -0.04015807271345601, 0.06922397572146374, 0.11876489236196384, -0.337877510917149, 0.16485935944402177, 0.08411118877267677, -0.01179510690979188, -0.15285167650944448, -0.10384217326093136, -0.05640333988173287, -0.02406289566992016, 0.01900338326563139, 0.10098384496979887, -0.0965603053204338, -0.1443263050345586, -0.013972483470717657, 0.3619755761155599, -0.14713549636351533, -0.27309388761950915, 0.057358502811174605, -0.15452519779593119, -0.16424925496825313, 0.07242677458620901, 0.12560851916286186, 0.13405345241197303, -0.13584038083547656, 0.18655770927736878, -0.05150433337976095, 0.16349435532819243, 0.1188116643365614, 0.0008205783647732644, -0.024730535365546806, 0.09763718037453445, 0.13174065116415673, 0.09383759249143209, -0.017220293679363036, -0.04481834789761637, -0.3285733042874291, -0.14246601763452532, -0.14425088969483688, 0.15857307031703524, -0.147564521577921, -0.10879727824932978, 0.3070152369209954, 0.14420363924737217, 0.18112043634387134, 0.07948972161010473, 0.11924507675539184, 0.2288537662582401, -0.03226896118714557, 0.11030544518622794, 0.16682899501646245, 0.1468430040816812, 0.18341217513042915, -0.2278651381618803, -0.01586073749003154, 0.20306034993285996] |
1,802.07346 | Cooperative Robot Localization Using Event-triggered Estimation | This paper describes a novel communication-spare cooperative localization
algorithm for a team of mobile unmanned robotic vehicles. Exploiting an
event-based estimation paradigm, robots only send measurements to neighbors
when the expected innovation for state estimation is high. Since agents know
the event-triggering condition for measurements to be sent, the lack of a
measurement is thus also informative and fused into state estimates. The robots
use a Covariance Intersection (CI) mechanism to occasionally synchronize their
local estimates of the full network state. In addition, heuristic balancing
dynamics on the robots' CI-triggering thresholds ensure that, in large diameter
networks, the local error covariances remains below desired bounds across the
network. Simulations on both linear and nonlinear dynamics/measurement models
show that the event-triggering approach achieves nearly optimal state
estimation performance in a wide range of operating conditions, even when using
only a fraction of the communication cost required by conventional full data
sharing. The robustness of the proposed approach to lossy communications, as
well as the relationship between network topology and CI-based synchronization
requirements, are also examined.
| cs.RO cs.SY eess.SP stat.AP | this paper describes a novel communicationspare cooperative localization algorithm for a team of mobile unmanned robotic vehicles exploiting an eventbased estimation paradigm robots only send measurements to neighbors when the expected innovation for state estimation is high since agents know the eventtriggering condition for measurements to be sent the lack of a measurement is thus also informative and fused into state estimates the robots use a covariance intersection ci mechanism to occasionally synchronize their local estimates of the full network state in addition heuristic balancing dynamics on the robots citriggering thresholds ensure that in large diameter networks the local error covariances remains below desired bounds across the network simulations on both linear and nonlinear dynamicsmeasurement models show that the eventtriggering approach achieves nearly optimal state estimation performance in a wide range of operating conditions even when using only a fraction of the communication cost required by conventional full data sharing the robustness of the proposed approach to lossy communications as well as the relationship between network topology and cibased synchronization requirements are also examined | [['this', 'paper', 'describes', 'a', 'novel', 'communicationspare', 'cooperative', 'localization', 'algorithm', 'for', 'a', 'team', 'of', 'mobile', 'unmanned', 'robotic', 'vehicles', 'exploiting', 'an', 'eventbased', 'estimation', 'paradigm', 'robots', 'only', 'send', 'measurements', 'to', 'neighbors', 'when', 'the', 'expected', 'innovation', 'for', 'state', 'estimation', 'is', 'high', 'since', 'agents', 'know', 'the', 'eventtriggering', 'condition', 'for', 'measurements', 'to', 'be', 'sent', 'the', 'lack', 'of', 'a', 'measurement', 'is', 'thus', 'also', 'informative', 'and', 'fused', 'into', 'state', 'estimates', 'the', 'robots', 'use', 'a', 'covariance', 'intersection', 'ci', 'mechanism', 'to', 'occasionally', 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1,802.07347 | Electron-Phonon Systems on a Universal Quantum Computer | We present an algorithm that extends existing quantum algorithms for
simulating fermion systems in quantum chemistry and condensed matter physics to
include bosons in general and phonons in particular. We introduce a qubit
representation for the low-energy subspace of phonons which allows an efficient
simulation of the evolution operator of the electron-phonon systems. As a
consequence of the Nyquist-Shannon sampling theorem, the phonons are
represented with exponential accuracy on a discretized Hilbert space with a
size that increases linearly with the cutoff of the maximum phonon number. The
additional number of qubits required by the presence of phonons scales linearly
with the size of the system. The additional circuit depth is constant for
systems with finite-range electron-phonon and phonon-phonon interactions and
linear for long-range electron-phonon interactions. Our algorithm for a
Holstein polaron problem was implemented on an Atos Quantum Learning Machine
(QLM) quantum simulator employing the Quantum Phase Estimation method. The
energy and the phonon number distribution of the polaron state agree with exact
diagonalization results for weak, intermediate and strong electron-phonon
coupling regimes.
| quant-ph cond-mat.str-el hep-ph | we present an algorithm that extends existing quantum algorithms for simulating fermion systems in quantum chemistry and condensed matter physics to include bosons in general and phonons in particular we introduce a qubit representation for the lowenergy subspace of phonons which allows an efficient simulation of the evolution operator of the electronphonon systems as a consequence of the nyquistshannon sampling theorem the phonons are represented with exponential accuracy on a discretized hilbert space with a size that increases linearly with the cutoff of the maximum phonon number the additional number of qubits required by the presence of phonons scales linearly with the size of the system the additional circuit depth is constant for systems with finiterange electronphonon and phononphonon interactions and linear for longrange electronphonon interactions our algorithm for a holstein polaron problem was implemented on an atos quantum learning machine qlm quantum simulator employing the quantum phase estimation method the energy and the phonon number distribution of the polaron state agree with exact diagonalization results for weak intermediate and strong electronphonon coupling regimes | [['we', 'present', 'an', 'algorithm', 'that', 'extends', 'existing', 'quantum', 'algorithms', 'for', 'simulating', 'fermion', 'systems', 'in', 'quantum', 'chemistry', 'and', 'condensed', 'matter', 'physics', 'to', 'include', 'bosons', 'in', 'general', 'and', 'phonons', 'in', 'particular', 'we', 'introduce', 'a', 'qubit', 'representation', 'for', 'the', 'lowenergy', 'subspace', 'of', 'phonons', 'which', 'allows', 'an', 'efficient', 'simulation', 'of', 'the', 'evolution', 'operator', 'of', 'the', 'electronphonon', 'systems', 'as', 'a', 'consequence', 'of', 'the', 'nyquistshannon', 'sampling', 'theorem', 'the', 'phonons', 'are', 'represented', 'with', 'exponential', 'accuracy', 'on', 'a', 'discretized', 'hilbert', 'space', 'with', 'a', 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1,802.07348 | A novel hybrid FSO / RF communication system with receive diversity | In mobile communication system, due to the limitations of mobile device such
as low power supply as well as small size, most of the processing should be
done at the Base Station. Using multi-receive structure at the Base Station
really helps better recovery of the original signal by combining different
received signals. In this paper, for the first time, receive diversity is used
in single-hop hybrid Free Space Optical / Radio Frequency (FSO / RF)
communication system. Also it is the first time that a single-hop hybrid FSO /
RF system is investigated at saturate atmospheric turbulence regime. For the
first time, closed-form expression is derived for Outage Probability of the
proposed system and verified through MATLAB simulation. Results indicate a
significant improvement in the performance of the proposed structure compared
with common FSO and RF systems with receive diversity. Therefore it can be
concluded that although the proposed structure requires a complex receiver, but
addition of this complexity could significantly reduce processing or power
consumption required for performance maintenance of the system.
| eess.SP | in mobile communication system due to the limitations of mobile device such as low power supply as well as small size most of the processing should be done at the base station using multireceive structure at the base station really helps better recovery of the original signal by combining different received signals in this paper for the first time receive diversity is used in singlehop hybrid free space optical radio frequency fso rf communication system also it is the first time that a singlehop hybrid fso rf system is investigated at saturate atmospheric turbulence regime for the first time closedform expression is derived for outage probability of the proposed system and verified through matlab simulation results indicate a significant improvement in the performance of the proposed structure compared with common fso and rf systems with receive diversity therefore it can be concluded that although the proposed structure requires a complex receiver but addition of this complexity could significantly reduce processing or power consumption required for performance maintenance of the system | [['in', 'mobile', 'communication', 'system', 'due', 'to', 'the', 'limitations', 'of', 'mobile', 'device', 'such', 'as', 'low', 'power', 'supply', 'as', 'well', 'as', 'small', 'size', 'most', 'of', 'the', 'processing', 'should', 'be', 'done', 'at', 'the', 'base', 'station', 'using', 'multireceive', 'structure', 'at', 'the', 'base', 'station', 'really', 'helps', 'better', 'recovery', 'of', 'the', 'original', 'signal', 'by', 'combining', 'different', 'received', 'signals', 'in', 'this', 'paper', 'for', 'the', 'first', 'time', 'receive', 'diversity', 'is', 'used', 'in', 'singlehop', 'hybrid', 'free', 'space', 'optical', 'radio', 'frequency', 'fso', 'rf', 'communication', 'system', 'also', 'it', 'is', 'the', 'first', 'time', 'that', 'a', 'singlehop', 'hybrid', 'fso', 'rf', 'system', 'is', 'investigated', 'at', 'saturate', 'atmospheric', 'turbulence', 'regime', 'for', 'the', 'first', 'time', 'closedform', 'expression', 'is', 'derived', 'for', 'outage', 'probability', 'of', 'the', 'proposed', 'system', 'and', 'verified', 'through', 'matlab', 'simulation', 'results', 'indicate', 'a', 'significant', 'improvement', 'in', 'the', 'performance', 'of', 'the', 'proposed', 'structure', 'compared', 'with', 'common', 'fso', 'and', 'rf', 'systems', 'with', 'receive', 'diversity', 'therefore', 'it', 'can', 'be', 'concluded', 'that', 'although', 'the', 'proposed', 'structure', 'requires', 'a', 'complex', 'receiver', 'but', 'addition', 'of', 'this', 'complexity', 'could', 'significantly', 'reduce', 'processing', 'or', 'power', 'consumption', 'required', 'for', 'performance', 'maintenance', 'of', 'the', 'system']] | [-0.2049292261318232, 0.04848290177767534, -0.016652432446693174, 0.007574629147754729, -0.060533937073681925, -0.1967143991427529, 0.08164461023248622, 0.3821271492179329, -0.25247468790328736, -0.31156312162332106, 0.10367282121731575, -0.21443921687445167, -0.17095306917016542, 0.23250545615457086, -0.09281208746675292, 0.06731249721921959, 0.07877838134575503, 0.07499290013702355, -0.024736333187234165, -0.24336774602460748, 0.23481460744873262, 0.17444714435414801, 0.3644991569474516, 0.02618570651958239, 0.08618757363474934, -0.0240904220597565, -0.006048971878023014, -0.010385631999867478, -0.03445750512825063, 0.061387670774718184, 0.3183971392252543, 0.1763470740878635, 0.2541221896966247, -0.4434192263929052, -0.29209945859530795, 0.07079559596553003, 0.1857722446476743, 0.04340270681571237, -0.06151329302752512, -0.24125896495237903, 0.11771155166258546, -0.24017032218777393, -0.05161746557162711, 0.006401099895606556, -0.04000099797694553, 0.06679935732611163, -0.2898881666154942, 0.01594338670476979, -0.0062295836885597495, 0.0621658456518684, -0.04317427433465095, -0.1159794402395557, -0.001469518188883126, 0.1883174179234823, 0.014289106224448634, 0.006289905085939275, 0.09949858203949132, -0.0884887092779859, -0.08046644171920313, 0.40158409443711474, -0.03321984345672002, -0.19924669841458723, 0.18963268108682477, -0.1285220156616625, -0.10579240831309522, 0.17887965294728111, 0.21933137311341142, 0.024036236749355785, -0.16299689036811918, 0.03102859038637108, 0.04600550853178875, 0.21254782707254077, 0.07972320755282362, 0.10996304968228707, 0.16602832326643477, 0.22982717795571664, 0.10148927302116297, 0.140754524030111, -0.11276812872232198, -0.06941247309872209, -0.21470658285591543, -0.14951813405037984, -0.240466918410546, 0.001995705260988876, -0.06116253973832823, -0.051822133433933444, 0.3639890891610033, 0.16354196310248612, 0.10880949034096574, 0.09344702728709878, 0.4334321510399411, 0.13382619583893832, 0.07167577533259403, 0.10880927191275729, 0.2251056593487359, 0.07377443165854501, 0.17370428371149496, -0.23823650495408202, 0.08710753222646402, -0.019873314258813328] |
1,802.07349 | New regime of plasma wake field acceleration in the extreme blowout
regime | Three dimensional particle in cell simulations are used for studying proton
driven plasma wake-field acceleration that uses a high-energy proton bunch to
drive a plasma wake-field for electron beam acceleration. A new parameter
regime was found which generates essentially constant electric field that is
three orders magnitudes larger than that of AWAKE design, i.e. of the order of
$2 \times 10^{3}$ GV/m. This is achieved in the the extreme blowout regime,
when number density of the driving proton bunch exceeds plasma electron number
density 100 times.
| physics.plasm-ph physics.acc-ph | three dimensional particle in cell simulations are used for studying proton driven plasma wakefield acceleration that uses a highenergy proton bunch to drive a plasma wakefield for electron beam acceleration a new parameter regime was found which generates essentially constant electric field that is three orders magnitudes larger than that of awake design ie of the order of 2 times 103 gvm this is achieved in the the extreme blowout regime when number density of the driving proton bunch exceeds plasma electron number density 100 times | [['three', 'dimensional', 'particle', 'in', 'cell', 'simulations', 'are', 'used', 'for', 'studying', 'proton', 'driven', 'plasma', 'wakefield', 'acceleration', 'that', 'uses', 'a', 'highenergy', 'proton', 'bunch', 'to', 'drive', 'a', 'plasma', 'wakefield', 'for', 'electron', 'beam', 'acceleration', 'a', 'new', 'parameter', 'regime', 'was', 'found', 'which', 'generates', 'essentially', 'constant', 'electric', 'field', 'that', 'is', 'three', 'orders', 'magnitudes', 'larger', 'than', 'that', 'of', 'awake', 'design', 'ie', 'of', 'the', 'order', 'of', '2', 'times', '103', 'gvm', 'this', 'is', 'achieved', 'in', 'the', 'the', 'extreme', 'blowout', 'regime', 'when', 'number', 'density', 'of', 'the', 'driving', 'proton', 'bunch', 'exceeds', 'plasma', 'electron', 'number', 'density', '100', 'times']] | [-0.11844431564244333, 0.33643847088827644, -0.013862854958143692, 0.07137492911343268, 0.04044104780092142, -0.1380817266945933, -0.05571482218477095, 0.38663283003450827, -0.1675855599663242, -0.3225533691299863, -0.0007761236331642194, -0.2217242170645054, 0.06422644483228755, 0.2665737998566244, 0.0427444514122705, 0.03445739894672189, 0.012493814363382583, -0.009821146510021632, -0.006727655123117878, -0.1705331044748079, 0.24607934798438882, 0.13225280033251227, 0.29471282665292886, 0.044211713380591815, 0.15202218041278767, -0.03624461010250068, 0.04818441069056822, 0.03250690281315338, -0.10453714743443714, 0.02424020530266124, 0.1974737131995214, 0.03699273865691624, 0.30447015359044766, -0.48266960520210656, -0.23512826653110774, 0.03946692936209052, 0.19272299069196505, 0.07917799364889128, -0.07810707876545399, -0.15078956934861665, 0.052327508840515, -0.2070002997250751, -0.1835494099163212, 0.007385406635030237, 0.055678820547506995, 0.06412275232981111, -0.3676679068824363, 0.07402491223521877, 0.002866469921955709, -0.014226410148102183, -0.0228428388999905, -0.09733744054967754, 0.05203325024177862, -0.0024665414330652417, 0.10904443693390592, 0.16585955217069145, 0.2682156905607689, -0.14549042396952985, -0.07251454968828448, 0.37900636626710726, -0.010472970613485559, -0.08312298314169396, 0.15385416780901684, -0.2920149686139857, -0.026870952128584303, 0.2379830951131014, 0.15356478788131891, 0.05249203217952231, -0.11450301904991393, 0.00995572497201867, 0.0010748038929345649, 0.20049508890613568, 0.18233809592256453, -0.009304156970925802, 0.17731341277790624, 0.2396573138959316, 0.0728831130274853, 0.07107830755845752, -0.16093221319796042, -0.014606678186980792, -0.2924010964478691, -0.07631008174313708, -0.1560564100807316, 0.06255814373265779, -0.09030008630090675, -0.1157659685948517, 0.4626870188797109, 0.17865048916292983, 0.10517701398592096, -0.059342805172998975, 0.3164325616820607, 0.15981790368163654, 0.013001289833228775, 0.11634347785459181, 0.25682624039608376, 0.12070812915755046, 0.11886546221767487, -0.2347340383485696, -0.0021227502892183702, 0.07105464783637937] |
1,802.0735 | Reimagine Procrastination: Music Preference and Health Habits as Factors
on Self-Perceived Procrastination of Young People | As the buzzword phenomenon, procrastination holds a continued need for a
comprehensive examination of its nature and the associated factors. The
presented study explores the potential relationship between music taste, life
style and the youngsters' procrastination through quantitative modelling. To
handle the big set of survey statistics and the uncertainty caused by the data
missingness, the combined methods of factor analysis, multiple imputation (MI)
and Ordered logit regression are employed. The result reveals that the music
preference for Hip-hop, AlternativeR and Opera have a significant effect on
procrastination. Concerning the living habits, the eating habit and local
authority (city/rural) also yield strong connection to the self-perceived
procrastination. Implications for this procrastination research is discussed.
| stat.AP | as the buzzword phenomenon procrastination holds a continued need for a comprehensive examination of its nature and the associated factors the presented study explores the potential relationship between music taste life style and the youngsters procrastination through quantitative modelling to handle the big set of survey statistics and the uncertainty caused by the data missingness the combined methods of factor analysis multiple imputation mi and ordered logit regression are employed the result reveals that the music preference for hiphop alternativer and opera have a significant effect on procrastination concerning the living habits the eating habit and local authority cityrural also yield strong connection to the selfperceived procrastination implications for this procrastination research is discussed | [['as', 'the', 'buzzword', 'phenomenon', 'procrastination', 'holds', 'a', 'continued', 'need', 'for', 'a', 'comprehensive', 'examination', 'of', 'its', 'nature', 'and', 'the', 'associated', 'factors', 'the', 'presented', 'study', 'explores', 'the', 'potential', 'relationship', 'between', 'music', 'taste', 'life', 'style', 'and', 'the', 'youngsters', 'procrastination', 'through', 'quantitative', 'modelling', 'to', 'handle', 'the', 'big', 'set', 'of', 'survey', 'statistics', 'and', 'the', 'uncertainty', 'caused', 'by', 'the', 'data', 'missingness', 'the', 'combined', 'methods', 'of', 'factor', 'analysis', 'multiple', 'imputation', 'mi', 'and', 'ordered', 'logit', 'regression', 'are', 'employed', 'the', 'result', 'reveals', 'that', 'the', 'music', 'preference', 'for', 'hiphop', 'alternativer', 'and', 'opera', 'have', 'a', 'significant', 'effect', 'on', 'procrastination', 'concerning', 'the', 'living', 'habits', 'the', 'eating', 'habit', 'and', 'local', 'authority', 'cityrural', 'also', 'yield', 'strong', 'connection', 'to', 'the', 'selfperceived', 'procrastination', 'implications', 'for', 'this', 'procrastination', 'research', 'is', 'discussed']] | [-0.10402400310912137, 0.03259681883459312, -0.09982935314058393, 0.13968500788489888, -0.13628928069998178, -0.09705915432173892, 0.1030286469197433, 0.3562479805550538, -0.2268588753649965, -0.3095945079278733, 0.11835051907941566, -0.303818893144905, -0.17335149424616247, 0.1720587968260848, -0.09000313950569502, 0.013038206997797326, 0.07299007046302515, 0.014119422402083208, -0.0007413763856415503, -0.2496021834626195, 0.30111503962793257, 0.08049490806219442, 0.31879515422250343, 0.0932634649611178, 0.0806308079741679, 0.045096713012234044, -0.1182022308390255, 0.014339789221204617, -0.11140503863530934, 0.13554846561341297, 0.25424214153151425, 0.18196274401270784, 0.33418165820018786, -0.38872065466629074, -0.18701328219114138, 0.11569863320827219, 0.08721182105832018, 0.04406454455394331, -0.08505369561836622, -0.31933065018217477, 0.0429124334685704, -0.17515101959413318, -0.09264317377320756, -0.07823755569240477, 0.013128674561033091, 0.022165721328097528, -0.23521398319696477, 0.10515461816534558, 0.07131857500020747, 0.14571167725703812, -0.055694658836208485, -0.1451463602300334, 0.0006788571627112105, 0.1761269798527272, 0.12267155062311628, 0.009124819690311727, 0.10834071451037224, -0.15068775947396976, -0.13398467179337917, 0.39093374136635767, -0.005793083762650245, -0.13692304784945009, 0.1685996141448933, -0.11061616600324799, -0.13961380056571215, 0.049405118803926076, 0.19458766949017964, 0.020490219226173525, -0.13497474096116743, 0.01302750163865442, -0.016930965251438983, 0.15513346000183706, 0.059771873842692, -0.002067282257615131, 0.20559541105675244, 0.1827696237814962, 0.008332800700113044, 0.08206542792530465, -0.04737212633075875, -0.10202434971662504, -0.231333823197409, -0.15093914638107112, -0.10225538687934334, 0.00036900131401905255, -0.10224574083284617, -0.1428565498208627, 0.37310431268581723, 0.15083754371984728, 0.15904505360439153, 0.036294854723174855, 0.2568602855483602, 0.045853359718421416, 0.054297701802819835, -0.011609763293693374, 0.18483708923408163, 0.1001334799657343, 0.15988678711333446, -0.23274115849302948, 0.1556934339252101, -0.0019103876236061166] |
1,802.07351 | Devon: Deformable Volume Network for Learning Optical Flow | State-of-the-art neural network models estimate large displacement optical
flow in multi-resolution and use warping to propagate the estimation between
two resolutions. Despite their impressive results, it is known that there are
two problems with the approach. First, the multi-resolution estimation of
optical flow fails in situations where small objects move fast. Second, warping
creates artifacts when occlusion or dis-occlusion happens. In this paper, we
propose a new neural network module, Deformable Cost Volume, which alleviates
the two problems. Based on this module, we designed the Deformable Volume
Network (Devon) which can estimate multi-scale optical flow in a single high
resolution. Experiments show Devon is more suitable in handling small objects
moving fast and achieves comparable results to the state-of-the-art methods in
public benchmarks.
| cs.CV | stateoftheart neural network models estimate large displacement optical flow in multiresolution and use warping to propagate the estimation between two resolutions despite their impressive results it is known that there are two problems with the approach first the multiresolution estimation of optical flow fails in situations where small objects move fast second warping creates artifacts when occlusion or disocclusion happens in this paper we propose a new neural network module deformable cost volume which alleviates the two problems based on this module we designed the deformable volume network devon which can estimate multiscale optical flow in a single high resolution experiments show devon is more suitable in handling small objects moving fast and achieves comparable results to the stateoftheart methods in public benchmarks | [['stateoftheart', 'neural', 'network', 'models', 'estimate', 'large', 'displacement', 'optical', 'flow', 'in', 'multiresolution', 'and', 'use', 'warping', 'to', 'propagate', 'the', 'estimation', 'between', 'two', 'resolutions', 'despite', 'their', 'impressive', 'results', 'it', 'is', 'known', 'that', 'there', 'are', 'two', 'problems', 'with', 'the', 'approach', 'first', 'the', 'multiresolution', 'estimation', 'of', 'optical', 'flow', 'fails', 'in', 'situations', 'where', 'small', 'objects', 'move', 'fast', 'second', 'warping', 'creates', 'artifacts', 'when', 'occlusion', 'or', 'disocclusion', 'happens', 'in', 'this', 'paper', 'we', 'propose', 'a', 'new', 'neural', 'network', 'module', 'deformable', 'cost', 'volume', 'which', 'alleviates', 'the', 'two', 'problems', 'based', 'on', 'this', 'module', 'we', 'designed', 'the', 'deformable', 'volume', 'network', 'devon', 'which', 'can', 'estimate', 'multiscale', 'optical', 'flow', 'in', 'a', 'single', 'high', 'resolution', 'experiments', 'show', 'devon', 'is', 'more', 'suitable', 'in', 'handling', 'small', 'objects', 'moving', 'fast', 'and', 'achieves', 'comparable', 'results', 'to', 'the', 'stateoftheart', 'methods', 'in', 'public', 'benchmarks']] | [-0.1014742090497393, 0.04828045377129219, -0.059332674649369914, 0.04920662373301528, -0.0735293385587875, -0.17822662135964729, -0.045075133210284696, 0.464658998763113, -0.29955653412403854, -0.30369637022930673, 0.10710221750101423, -0.2358535021482929, -0.20312475699957885, 0.21002760406666837, -0.17553113200285328, 0.0856752056870761, 0.15757033341692958, -0.008855190309809476, -0.08853522218561284, -0.23711717119289002, 0.2700941353682353, 0.0275747547365301, 0.3303030520541275, 0.035893227844461195, 0.16470189103326663, -0.030006822709721034, -0.04670857404154248, 0.036050486890409836, -0.06820423362192904, 0.17251210890680066, 0.246591562506885, 0.08733234058391696, 0.31365347803547616, -0.4363113887365756, -0.2257672381716046, 0.09456819471641921, 0.1345697115591871, 0.12641094730053914, -0.034694697260804576, -0.2720224546586595, 0.0824757303618561, -0.15992485110958418, -0.0334296085288733, -0.12239961396350063, -0.03603404867500672, 0.01376572300536119, -0.2710823928483012, 0.08658165976261281, 0.03250120084626767, 0.03494143184668165, -0.051363737099024094, -0.05979906337911157, 0.03112469282667569, 0.15580154488329792, 0.0090274471691166, 0.050070807301795216, 0.13143111031021681, -0.20103403536330272, -0.09789316865759409, 0.394003852565841, -0.06410803009445469, -0.22986917350653227, 0.23444851781847334, -0.09006203295344986, -0.12683449823757617, 0.1584608201921834, 0.23735859694822534, 0.1401364183842727, -0.10303203563068188, -0.007572143733296998, -0.04658335968861508, 0.1828984265609425, 0.05585029928536132, -0.0157659034835311, 0.16613086230477425, 0.26509096433135976, 0.09197339023382033, 0.13712172972973496, -0.19684277849112888, -0.061299498828991154, -0.23936396230739065, -0.08531315538727459, -0.17135164502069233, -0.05774600838776678, -0.1269148749304553, -0.16719863427484907, 0.35552979780103616, 0.20478193485367346, 0.2109083965026993, 0.08016288893229169, 0.3928659084268157, 0.026976783285712506, 0.12120926452656769, 0.1281316711991359, 0.2150664414635034, 0.02688292163231115, 0.12413480329825126, -0.16159215578795183, 0.026133148298727545, 0.08545449004334406] |
1,802.07352 | Crystal graphs for shifted tableaux | We define crystal operators on semistandard shifted tableaux, giving a new
proof that Schur $P$-functions are Schur positive. We define a queer crystal
operator to construct a connected queer crystal on semistandard shifted
tableaux of a given shape, providing a new proof that products of Schur
$P$-functions are Schur $P$-positive. We also give a rectification map from
shifted tableaux to Young tableaux that commutes with the crystal operators and
provides a dual algorithm to shifted insertion.
| math.CO math.RT | we define crystal operators on semistandard shifted tableaux giving a new proof that schur pfunctions are schur positive we define a queer crystal operator to construct a connected queer crystal on semistandard shifted tableaux of a given shape providing a new proof that products of schur pfunctions are schur ppositive we also give a rectification map from shifted tableaux to young tableaux that commutes with the crystal operators and provides a dual algorithm to shifted insertion | [['we', 'define', 'crystal', 'operators', 'on', 'semistandard', 'shifted', 'tableaux', 'giving', 'a', 'new', 'proof', 'that', 'schur', 'pfunctions', 'are', 'schur', 'positive', 'we', 'define', 'a', 'queer', 'crystal', 'operator', 'to', 'construct', 'a', 'connected', 'queer', 'crystal', 'on', 'semistandard', 'shifted', 'tableaux', 'of', 'a', 'given', 'shape', 'providing', 'a', 'new', 'proof', 'that', 'products', 'of', 'schur', 'pfunctions', 'are', 'schur', 'ppositive', 'we', 'also', 'give', 'a', 'rectification', 'map', 'from', 'shifted', 'tableaux', 'to', 'young', 'tableaux', 'that', 'commutes', 'with', 'the', 'crystal', 'operators', 'and', 'provides', 'a', 'dual', 'algorithm', 'to', 'shifted', 'insertion']] | [-0.10375239957418096, 0.13433810018346107, -0.13235787868401722, 0.04803998687451607, -0.22949014381677107, -0.1931721931629765, 0.10066348189291985, 0.4364218373635882, -0.33362593767723364, -0.17561761683808932, 0.03543357723270004, -0.20999382094382063, -0.15309264253530847, 0.1521964387134894, -0.18994134849574612, -0.05901407871983553, 0.04781028145532075, -0.011375713480734512, -0.17146128428315646, -0.1780645677966899, 0.33295950542302116, 0.005937681508887755, 0.1772222237563447, -0.000502488146977205, 0.11786996999657467, -0.017141259419364167, -0.02959809768607987, -0.043294003919551245, -0.1578796110344755, 0.1963934525847435, 0.24154500817683966, 0.09755184480577316, 0.1565766204148531, -0.3506757196369826, 0.08225964304476388, 0.1631878525674294, 0.2345311125237985, 0.0013475785963237286, -0.13611904356787963, -0.29933240365138963, 0.012595587431477677, -0.21043627844483126, -0.17597833208396638, -0.06951065708294903, 0.004402549477833274, 0.046155344131157586, -0.31603631857586534, -0.06403090018437452, 0.11861238136005245, 0.09610918454678827, -0.03307333169505, -0.23638808879217035, -0.0054171417447689335, 0.006876934313607451, -0.14456668743667633, 0.05883248350246025, 0.13994021214373215, -0.07756916227701463, -0.2231496252658728, 0.31410758914793596, 0.030103481815833794, -0.28631580765604187, 0.0642478650215229, -0.19006798203152261, -0.16606749583795472, 0.1294088800756359, 0.0038388530619589516, 0.1113026422987643, -0.017797555333297504, 0.11516606864001676, -0.20795533764421156, 0.08369380027349842, 0.20899770542440055, 0.011771587526278668, 0.18436467703922013, 0.025349220064909833, 0.06289800151104205, 0.29756023565699397, 0.07378797158353816, -0.049390277083914136, -0.2967428883635684, -0.2292115675763374, -0.11727202358949733, 0.07528510627238766, -0.14075801250089026, -0.3372146480373646, 0.41499277763068676, 0.05131651371515258, 0.15256330294620343, 0.17780534419427185, 0.11257781050976758, 0.1575022700830902, 0.1934049641100788, -0.09590997814053767, 0.048006328496787896, 0.31432529814896715, 0.0547805678859157, -0.15336100022786445, -0.03968375753366241, 0.2976097755661038] |
1,802.07353 | Non-relativistic Arbitrary l-states of Quarkonium through Asymptotic
Iteration Method | The energy eigenvalues with any l-states and mass of heavy quark- antiquark
system (quarkonium) are obtained by using Asymptotic Iteration Method in the
view of non-relativistic quantum chromodynamics, in which the quarks are
considered as spinless for easiness, and are bounded by Cornell potential. A
semi-analytical formula for energy eigenvalues and mass is achieved via the
method in scope of the perturbation theory. The accuracy of this formula is
checked by comparing the eigenvalues with the ones numerically obtained in this
study, and with exact ones in literature. Furthermore, semi-analytical formula
is applied to some meson systems for comparing the masses with the experimental
data.
| physics.gen-ph | the energy eigenvalues with any lstates and mass of heavy quark antiquark system quarkonium are obtained by using asymptotic iteration method in the view of nonrelativistic quantum chromodynamics in which the quarks are considered as spinless for easiness and are bounded by cornell potential a semianalytical formula for energy eigenvalues and mass is achieved via the method in scope of the perturbation theory the accuracy of this formula is checked by comparing the eigenvalues with the ones numerically obtained in this study and with exact ones in literature furthermore semianalytical formula is applied to some meson systems for comparing the masses with the experimental data | [['the', 'energy', 'eigenvalues', 'with', 'any', 'lstates', 'and', 'mass', 'of', 'heavy', 'quark', 'antiquark', 'system', 'quarkonium', 'are', 'obtained', 'by', 'using', 'asymptotic', 'iteration', 'method', 'in', 'the', 'view', 'of', 'nonrelativistic', 'quantum', 'chromodynamics', 'in', 'which', 'the', 'quarks', 'are', 'considered', 'as', 'spinless', 'for', 'easiness', 'and', 'are', 'bounded', 'by', 'cornell', 'potential', 'a', 'semianalytical', 'formula', 'for', 'energy', 'eigenvalues', 'and', 'mass', 'is', 'achieved', 'via', 'the', 'method', 'in', 'scope', 'of', 'the', 'perturbation', 'theory', 'the', 'accuracy', 'of', 'this', 'formula', 'is', 'checked', 'by', 'comparing', 'the', 'eigenvalues', 'with', 'the', 'ones', 'numerically', 'obtained', 'in', 'this', 'study', 'and', 'with', 'exact', 'ones', 'in', 'literature', 'furthermore', 'semianalytical', 'formula', 'is', 'applied', 'to', 'some', 'meson', 'systems', 'for', 'comparing', 'the', 'masses', 'with', 'the', 'experimental', 'data']] | [-0.056955764664425736, 0.12159632309561684, -0.10049950330562535, 0.0989761047830273, 0.007400399162655785, -0.1332815238540726, 0.051539863995276394, 0.33891469030862764, -0.15214363691352661, -0.2978146003115745, 0.04708690460483056, -0.29023414076793763, -0.04517072048925218, 0.20558677845290818, 0.009457609665003561, 0.12900233039898532, 0.0974510336028678, 0.07002373180086059, -0.08296983181055458, -0.23440309580238092, 0.34802584785835017, 0.02362467693054073, 0.20107264733607216, 0.12097865955105849, 0.03500894006629962, 0.0052276876333746175, -0.013220924467203164, -0.00645748677973946, -0.09691850852132552, 0.11517446680615345, 0.22453584604885518, 0.06335209658635514, 0.20024316327291586, -0.388421757217674, -0.17277236172618965, 0.0710554071569017, 0.15389608580264308, 0.14415391601422536, -0.0838786698079535, -0.32015268360929827, 0.12446591584898886, -0.22213635840231463, -0.20539197564302455, -0.09974420146927947, -0.005264485499355942, 0.025528285228869036, -0.2919329485368161, 0.12312935678554433, -0.03260190089765404, 0.038198477242674146, -0.07668414093287927, -0.17886614907155968, -0.022892596838729722, 0.05961581688108189, 0.0912718742753246, 0.02290547317381771, 0.09031689243745945, -0.13651958376257903, -0.1256374534441247, 0.40398242525933753, -0.06591821257246747, -0.22461746730730825, 0.11625953398290134, -0.14620244037359953, -0.06828944759798192, 0.08433946428731794, 0.12011022507240773, 0.12538229762354777, -0.19633220339282637, 0.15746161386237612, -0.01697892031321923, 0.08523776229648362, 0.08103171347063921, 0.016586838822279657, 0.17721259499057418, 0.13416958446170957, -0.03201338611543179, 0.12443417872612675, -0.01600415011690486, -0.1294871133530424, -0.30850541738881954, -0.1238400029317875, -0.23431046140335854, 0.0008738849045974868, -0.11760343022234294, -0.10704697531736677, 0.39080040772401153, 0.11511330365070276, 0.2066180400018181, 0.08882455147159773, 0.3356709636481745, 0.19850416701353554, 0.02905310420762925, 0.08340035906238925, 0.2622889802006761, 0.1760854890015686, 0.12394282337100733, -0.2549419670121833, -0.016089135896237124, 0.1527363710952202] |
1,802.07354 | Quality Assurance of Bioinformatics Software: A Case Study of Testing a
Biomedical Text Processing Tool Using Metamorphic Testing | Bioinformatics software plays a very important role in making critical
decisions within many areas including medicine and health care. However, most
of the research is directed towards developing tools, and little time and
effort is spent on testing the software to assure its quality. In testing, a
test oracle is used to determine whether a test is passed or failed during
testing, and unfortunately, for much of bioinformatics software, the exact
expected outcomes are not well defined. Thus, the main challenge associated
with conducting systematic testing on bioinformatics software is the oracle
problem.
Metamorphic testing (MT) is a technique used to test programs that face the
oracle problem. MT uses metamorphic relations (MRs) to determine whether a test
has passed or failed and specifies how the output should change according to a
specific change made to the input. In this work, we use MT to test LingPipe, a
tool for processing text using computational linguistics, often used in
bioinformatics for bio-entity recognition from biomedical literature.
First, we identify a set of MRs for testing any bio-entity recognition
program. Then we develop a set of test cases that can be used to test
LingPipe's bio-entity recognition functionality using these MRs. To evaluate
the effectiveness of this testing process, we automatically generate a set of
faulty versions of LingPipe. According to our analysis of the experimental
results, we observe that our MRs can detect the majority of these faulty
versions, which shows the utility of this testing technique for quality
assurance of bioinformatics software.
| cs.SE | bioinformatics software plays a very important role in making critical decisions within many areas including medicine and health care however most of the research is directed towards developing tools and little time and effort is spent on testing the software to assure its quality in testing a test oracle is used to determine whether a test is passed or failed during testing and unfortunately for much of bioinformatics software the exact expected outcomes are not well defined thus the main challenge associated with conducting systematic testing on bioinformatics software is the oracle problem metamorphic testing mt is a technique used to test programs that face the oracle problem mt uses metamorphic relations mrs to determine whether a test has passed or failed and specifies how the output should change according to a specific change made to the input in this work we use mt to test lingpipe a tool for processing text using computational linguistics often used in bioinformatics for bioentity recognition from biomedical literature first we identify a set of mrs for testing any bioentity recognition program then we develop a set of test cases that can be used to test lingpipes bioentity recognition functionality using these mrs to evaluate the effectiveness of this testing process we automatically generate a set of faulty versions of lingpipe according to our analysis of the experimental results we observe that our mrs can detect the majority of these faulty versions which shows the utility of this testing technique for quality assurance of bioinformatics software | [['bioinformatics', 'software', 'plays', 'a', 'very', 'important', 'role', 'in', 'making', 'critical', 'decisions', 'within', 'many', 'areas', 'including', 'medicine', 'and', 'health', 'care', 'however', 'most', 'of', 'the', 'research', 'is', 'directed', 'towards', 'developing', 'tools', 'and', 'little', 'time', 'and', 'effort', 'is', 'spent', 'on', 'testing', 'the', 'software', 'to', 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1,802.07355 | Controlling magnetism in 2D CrI3 by electrostatic doping | The atomic thickness of two-dimensional (2D) materials provides a unique
opportunity to control material properties and engineer new functionalities by
electrostatic doping. Electrostatic doping has been demonstrated to tune the
electrical and optical properties of 2D materials in a wide range, as well as
to drive the electronic phase transitions. The recent discovery of atomically
thin magnetic insulators has opened up the prospect of electrical control of
magnetism and new devices with unprecedented performance. Here we demonstrate
control of the magnetic properties of monolayer and bilayer CrI3 by
electrostatic doping using a dual-gate field-effect device structure. In
monolayer CrI3, doping significantly modifies the saturation magnetization,
coercive force and Curie temperature, showing strengthened (weakened) magnetic
order with hole (electron) doping. Remarkably, in bilayer CrI3 doping
drastically changes the interlayer magnetic order, causing a transition from an
antiferromagnetic ground state in the pristine form to a ferromagnetic ground
state above a critical electron density. The result reveals a strongly
doping-dependent interlayer exchange coupling, which enables robust switching
of magnetization in bilayer CrI3 by small gate voltages.
| cond-mat.mtrl-sci | the atomic thickness of twodimensional 2d materials provides a unique opportunity to control material properties and engineer new functionalities by electrostatic doping electrostatic doping has been demonstrated to tune the electrical and optical properties of 2d materials in a wide range as well as to drive the electronic phase transitions the recent discovery of atomically thin magnetic insulators has opened up the prospect of electrical control of magnetism and new devices with unprecedented performance here we demonstrate control of the magnetic properties of monolayer and bilayer cri3 by electrostatic doping using a dualgate fieldeffect device structure in monolayer cri3 doping significantly modifies the saturation magnetization coercive force and curie temperature showing strengthened weakened magnetic order with hole electron doping remarkably in bilayer cri3 doping drastically changes the interlayer magnetic order causing a transition from an antiferromagnetic ground state in the pristine form to a ferromagnetic ground state above a critical electron density the result reveals a strongly dopingdependent interlayer exchange coupling which enables robust switching of magnetization in bilayer cri3 by small gate voltages | [['the', 'atomic', 'thickness', 'of', 'twodimensional', '2d', 'materials', 'provides', 'a', 'unique', 'opportunity', 'to', 'control', 'material', 'properties', 'and', 'engineer', 'new', 'functionalities', 'by', 'electrostatic', 'doping', 'electrostatic', 'doping', 'has', 'been', 'demonstrated', 'to', 'tune', 'the', 'electrical', 'and', 'optical', 'properties', 'of', '2d', 'materials', 'in', 'a', 'wide', 'range', 'as', 'well', 'as', 'to', 'drive', 'the', 'electronic', 'phase', 'transitions', 'the', 'recent', 'discovery', 'of', 'atomically', 'thin', 'magnetic', 'insulators', 'has', 'opened', 'up', 'the', 'prospect', 'of', 'electrical', 'control', 'of', 'magnetism', 'and', 'new', 'devices', 'with', 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1,802.07356 | Hydrodynamic fluctuations in quasi-two dimensional diffusion | We study diffusion of colloids on a fluid-fluid interface using particle
simulations and fluctuating hydrodynamics. Diffusion on a two-dimensional
interface with three-dimensional hydrodynamics is known to be anomalous, with
the collective diffusion coefficient diverging like the inverse of the
wavenumber. This unusual collective effect arises because of the
compressibility of the fluid flow in the plane of the interface, and leads to a
nonlinear nonlocal convolution term in the diffusion equation for the
ensemble-averaged concentration. We extend the previous hydrodynamic theory to
account for a species/color labeling of the particles, as necessary to model
experiments based on fluorescent techniques. We study the magnitude and
dynamics of density and color density fluctuations using a novel Brownian
dynamics algorithm, as well as fluctuating hydrodynamics theory and simulation.
We find that hydrodynamic coupling between a single tagged particle and
collective density fluctuations leads to a reduction of the long-time
self-diffusion coefficient, even for an ideal gas of non-interacting particles.
Using linearized fluctuating hydrodynamics theory, we show that for diffusion
on a fluid-fluid interface, nonequilibrium fluctuations of the total density
are small compared to the equilibrium fluctuations, but fluctuations of color
density are giant and exhibit a spectrum that decays as the inverse cubed power
of the wavenumber. We confirm these predictions through Brownian dynamics
simulations of diffusive mixing with two indistinguishable species. We also
examine nonequilibrium fluctuations in systems with two-dimensional
hydrodynamics, such as thin smectic films in vacuum. We find that
nonequilibrium fluctuations are colossal and comparable in magnitude to the
mean, and can be accurately modeled using numerical solvers for the nonlinear
equations of fluctuating hydrodynamics.
| cond-mat.stat-mech cond-mat.soft | we study diffusion of colloids on a fluidfluid interface using particle simulations and fluctuating hydrodynamics diffusion on a twodimensional interface with threedimensional hydrodynamics is known to be anomalous with the collective diffusion coefficient diverging like the inverse of the wavenumber this unusual collective effect arises because of the compressibility of the fluid flow in the plane of the interface and leads to a nonlinear nonlocal convolution term in the diffusion equation for the ensembleaveraged concentration we extend the previous hydrodynamic theory to account for a speciescolor labeling of the particles as necessary to model experiments based on fluorescent techniques we study the magnitude and dynamics of density and color density fluctuations using a novel brownian dynamics algorithm as well as fluctuating hydrodynamics theory and simulation we find that hydrodynamic coupling between a single tagged particle and collective density fluctuations leads to a reduction of the longtime selfdiffusion coefficient even for an ideal gas of noninteracting particles using linearized fluctuating hydrodynamics theory we show that for diffusion on a fluidfluid interface nonequilibrium fluctuations of the total density are small compared to the equilibrium fluctuations but fluctuations of color density are giant and exhibit a spectrum that decays as the inverse cubed power of the wavenumber we confirm these predictions through brownian dynamics simulations of diffusive mixing with two indistinguishable species we also examine nonequilibrium fluctuations in systems with twodimensional hydrodynamics such as thin smectic films in vacuum we find that nonequilibrium fluctuations are colossal and comparable in magnitude to the mean and can be accurately modeled using numerical solvers for the nonlinear equations of fluctuating hydrodynamics | [['we', 'study', 'diffusion', 'of', 'colloids', 'on', 'a', 'fluidfluid', 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1,802.07357 | Tien Shan data on inelastic proton-air cross section at 10 PeV | New data on the absolute value on the inelastic proton-air cross section at
10 PeV are presented. Conclusion is made about the growth with energy of the
inelastic proton-air cross section according to comparisons with experimental
data were obtained at the Tien Shan complex array on various components of
extensive air showers: hadrons, Cherenkov light and electrons with many
different calculated models of cosmic rays interactions at the atmosphere. The
analysis showed that the rise conforms to 7-9 % per one order of the energy
from 0.2 TeV (accelerators with fixed targets) to 10 PeV (EAS cosmic rays).
That corresponds to around 350 mb at 1 PeV and 380 mb at 10 PeV of primary
cosmic rays. These data corresponds better to the QGSJET-II-04 model version.
| astro-ph.HE hep-ex | new data on the absolute value on the inelastic protonair cross section at 10 pev are presented conclusion is made about the growth with energy of the inelastic protonair cross section according to comparisons with experimental data were obtained at the tien shan complex array on various components of extensive air showers hadrons cherenkov light and electrons with many different calculated models of cosmic rays interactions at the atmosphere the analysis showed that the rise conforms to 79 per one order of the energy from 02 tev accelerators with fixed targets to 10 pev eas cosmic rays that corresponds to around 350 mb at 1 pev and 380 mb at 10 pev of primary cosmic rays these data corresponds better to the qgsjetii04 model version | [['new', 'data', 'on', 'the', 'absolute', 'value', 'on', 'the', 'inelastic', 'protonair', 'cross', 'section', 'at', '10', 'pev', 'are', 'presented', 'conclusion', 'is', 'made', 'about', 'the', 'growth', 'with', 'energy', 'of', 'the', 'inelastic', 'protonair', 'cross', 'section', 'according', 'to', 'comparisons', 'with', 'experimental', 'data', 'were', 'obtained', 'at', 'the', 'tien', 'shan', 'complex', 'array', 'on', 'various', 'components', 'of', 'extensive', 'air', 'showers', 'hadrons', 'cherenkov', 'light', 'and', 'electrons', 'with', 'many', 'different', 'calculated', 'models', 'of', 'cosmic', 'rays', 'interactions', 'at', 'the', 'atmosphere', 'the', 'analysis', 'showed', 'that', 'the', 'rise', 'conforms', 'to', '79', 'per', 'one', 'order', 'of', 'the', 'energy', 'from', '02', 'tev', 'accelerators', 'with', 'fixed', 'targets', 'to', '10', 'pev', 'eas', 'cosmic', 'rays', 'that', 'corresponds', 'to', 'around', '350', 'mb', 'at', '1', 'pev', 'and', '380', 'mb', 'at', '10', 'pev', 'of', 'primary', 'cosmic', 'rays', 'these', 'data', 'corresponds', 'better', 'to', 'the', 'qgsjetii04', 'model', 'version']] | [-0.027970893265213816, 0.1947477618306875, -0.03377956928918138, 0.13193164450768383, -0.0008458994571119547, -0.032648652851581576, -0.016837071292102337, 0.3881254926845431, -0.20914889140427112, -0.4417500936090946, 0.00012930460087954998, -0.4319968581199646, 0.06677350515127183, 0.20981251404248177, 0.06485645200312137, 0.024242609885521234, 0.11733239306835458, 0.015268133488483727, 0.01010972935333848, -0.22966657510399818, 0.24374229064583777, 0.21306456567347049, 0.26011329419910906, 0.12826104891300202, 0.1265741677461192, -0.0023068772554397585, -0.05024615496984916, -0.09395729322970146, -0.134114803551347, 0.11091935446672141, 0.23724894353878334, 0.06960495265945792, 0.10346438889205456, -0.40080953054130075, -0.17578801776468753, 0.1049053420200944, 0.09605497489869595, -0.012212569538503885, -0.001578548594377935, -0.2826710409410298, 0.14626536417752503, -0.16187705481983722, -0.1587721993252635, 0.06934583620727063, -0.05571245892858133, 0.026043942735996098, -0.20629658473748713, 0.06032314848341048, -0.06068098807707429, 0.06185641677025706, -0.09820830388367176, -0.21925898426026105, 0.006105978519539349, 0.011785265609622002, 0.11682083841133863, 0.07473559620976448, 0.1688839767538011, -0.08785541185364128, -0.12330718921124935, 0.369818136587739, -0.04535449724365026, -0.06022762442752719, 0.20231508915126323, -0.19017387527227403, -0.13699328650534154, 0.2975338999755913, 0.19119477273896338, 0.02358814337477088, -0.19660998682677747, 0.05306210664939135, 0.02978199749486521, 0.1995771748330444, 0.1199898176304996, -0.05410257857106626, 0.23306166774779558, 0.20067307666689158, 0.06237839650822571, 0.011697641387581826, -0.18704617510922253, -0.009125471808016301, -0.3320364393852651, -0.07657716551423073, -0.11491673350520432, 0.10496032517874847, -0.09793226944259367, -0.04038624599017203, 0.3802259986381978, 0.11964619621634483, 0.23758940380066634, 0.01703394651785493, 0.28474210798740385, 0.020051563769578933, 0.03830211038142443, 0.0851376105779782, 0.29274338315054776, 0.12474592174403369, 0.17885244236513972, -0.143915218712762, 0.006288480468094349, -0.023879219394177198] |
1,802.07358 | Magnetize Topological Surface States of Bi2Se3 with a CrI3 Monolayer | To magnetize surfaces of topological insulators without damaging their
topological feature is a crucial step for the realization of the quantum
anomalous Hall effect (QAHE), and still remains as a challenging task. Through
density functional calculations, we found that adsorption of a two-dimensional
van der Waals (2D-vdW) ferromagnetic insulator CrI3 monolayer can create a
sizable spin splitting at the Dirac point of the topological surface states of
Bi2Se3 films. Furthermore, general rules that connect different quantum and
topological parameters are established through model analyses. This work
provides a useful guideline for the realization of QAHE at high temperature in
heterostructures of 2D-vdW magnetic monolayers and topological insulators.
| cond-mat.mes-hall cond-mat.mtrl-sci | to magnetize surfaces of topological insulators without damaging their topological feature is a crucial step for the realization of the quantum anomalous hall effect qahe and still remains as a challenging task through density functional calculations we found that adsorption of a twodimensional van der waals 2dvdw ferromagnetic insulator cri3 monolayer can create a sizable spin splitting at the dirac point of the topological surface states of bi2se3 films furthermore general rules that connect different quantum and topological parameters are established through model analyses this work provides a useful guideline for the realization of qahe at high temperature in heterostructures of 2dvdw magnetic monolayers and topological insulators | [['to', 'magnetize', 'surfaces', 'of', 'topological', 'insulators', 'without', 'damaging', 'their', 'topological', 'feature', 'is', 'a', 'crucial', 'step', 'for', 'the', 'realization', 'of', 'the', 'quantum', 'anomalous', 'hall', 'effect', 'qahe', 'and', 'still', 'remains', 'as', 'a', 'challenging', 'task', 'through', 'density', 'functional', 'calculations', 'we', 'found', 'that', 'adsorption', 'of', 'a', 'twodimensional', 'van', 'der', 'waals', '2dvdw', 'ferromagnetic', 'insulator', 'cri3', 'monolayer', 'can', 'create', 'a', 'sizable', 'spin', 'splitting', 'at', 'the', 'dirac', 'point', 'of', 'the', 'topological', 'surface', 'states', 'of', 'bi2se3', 'films', 'furthermore', 'general', 'rules', 'that', 'connect', 'different', 'quantum', 'and', 'topological', 'parameters', 'are', 'established', 'through', 'model', 'analyses', 'this', 'work', 'provides', 'a', 'useful', 'guideline', 'for', 'the', 'realization', 'of', 'qahe', 'at', 'high', 'temperature', 'in', 'heterostructures', 'of', '2dvdw', 'magnetic', 'monolayers', 'and', 'topological', 'insulators']] | [-0.19854416440107991, 0.21299483309544268, -0.06731536767578551, 0.032224175351716226, -0.061741839828235764, -0.21963757176750473, 0.11304008984228685, 0.36965295249330143, -0.23075244378830706, -0.29278832778689406, -0.04588034077702711, -0.29534830608006035, -0.21769388230473158, 0.22495051026566043, 0.032153889306244396, 0.10870033398802792, -0.03819126301400718, -0.13591856261094412, -0.1169532985138219, -0.22479695294917162, 0.3041497521745484, -0.011945145286708361, 0.34566680439526126, 0.1497842586776685, 0.030333617265291865, -0.03691535335300224, 0.16260294083372823, 0.034128615277863684, -0.19327559765231508, 0.0841570095513903, 0.3075758928344363, -0.1896561290270516, 0.21592409543338276, -0.4768304293531747, -0.2429251101333648, -0.04039559369640691, 0.08519762495887422, 0.20396119877696037, -0.12419901522142547, -0.32429247056799276, 0.11225033505331902, -0.15879376274311827, -0.08437065319823367, -0.1576740252430595, -0.006433025836235001, -0.1018683782246496, -0.17920037747992734, 0.06361249412986494, 0.07533073713060558, 0.10110918801614649, -0.05561527827133735, -0.09825788194291471, -0.14328274121064516, 0.1092893375837732, 0.006053083493108196, 0.03140824978638972, 0.1764753496318701, -0.18766367159384703, -0.16296224126680975, 0.4092009328749208, -0.035064811561079254, -0.11587502899624053, 0.19213553145971327, -0.1340519585336248, -0.11642846413222807, 0.10399620011005373, 0.11143872787998546, 0.09287617466013347, -0.10230653237196662, 0.1183727425018636, -0.009955659097371002, 0.14282296779038872, 0.025449289181934936, 0.1037936167907901, 0.3413613667800313, 0.19800992884362736, 0.0928861957597768, 0.13683230241405822, -0.09069567225607378, -0.009493950246611522, -0.22922723857419833, -0.28958507435662406, -0.29219223190365096, 0.10909322186240128, -0.04467091416632424, -0.2468118884467653, 0.4227343782959949, 0.14937224734042373, 0.14387706329497243, -0.07378072645515203, 0.24480909489405653, 0.0960132951083194, 0.05894845839190696, -0.03940890698438688, 0.21979828195735102, 0.16199406701184454, 0.0993567037662225, -0.2315154924633957, 0.09689209284704356, 0.052799018543391] |
1,802.07359 | Positive temperature dynamics on Gelfand-Tsetlin patterns restricted by
wall | The thesis focuses on processes on symplectic Gelfand-Tsetlin patterns. In
chapter 4, a process with dynamics inspired by the Berele correspondence
[Ber86] is presented. It is proved that the shape of the pattern is a Doob
$h$-transform of independent random walks with $h$ given by the symplectic
Schur function. This is followed by an extension to a $q$-weighted version.
This randomised version has itself a branching structure and is related to a
$q$-deformation of the $so_{2n+1}$-Whittaker functions. In chapter 5, we
present a fully randomised process. This process $q$-deforms a process proposed
in [WW09]. In chapter 7 we prove the convergence of the $q$-deformation of the
$so_{2n+1}$-Whittaker functions to the classical $so_{2n+1}$-Whittaker
functions when $q \to 1$. Finally, in chapter 8 we turn our interest to the
continuous setting and construct a process on patterns which contains a
positive temperature analogue of the Dyson's Brownian motion of type $B/C$. The
processes obtained are $h$-transforms of Brownian motions killed at a
continuous rate that depends on their distance from the boundary of the Weyl
chamber of type $B/C$, with $h$ related with the $so_{2n+1}$-Whittaker
functions.
| math.PR math.CO math.RT | the thesis focuses on processes on symplectic gelfandtsetlin patterns in chapter 4 a process with dynamics inspired by the berele correspondence ber86 is presented it is proved that the shape of the pattern is a doob htransform of independent random walks with h given by the symplectic schur function this is followed by an extension to a qweighted version this randomised version has itself a branching structure and is related to a qdeformation of the so_2n1whittaker functions in chapter 5 we present a fully randomised process this process qdeforms a process proposed in ww09 in chapter 7 we prove the convergence of the qdeformation of the so_2n1whittaker functions to the classical so_2n1whittaker functions when q to 1 finally in chapter 8 we turn our interest to the continuous setting and construct a process on patterns which contains a positive temperature analogue of the dysons brownian motion of type bc the processes obtained are htransforms of brownian motions killed at a continuous rate that depends on their distance from the boundary of the weyl chamber of type bc with h related with the so_2n1whittaker functions | [['the', 'thesis', 'focuses', 'on', 'processes', 'on', 'symplectic', 'gelfandtsetlin', 'patterns', 'in', 'chapter', '4', 'a', 'process', 'with', 'dynamics', 'inspired', 'by', 'the', 'berele', 'correspondence', 'ber86', 'is', 'presented', 'it', 'is', 'proved', 'that', 'the', 'shape', 'of', 'the', 'pattern', 'is', 'a', 'doob', 'htransform', 'of', 'independent', 'random', 'walks', 'with', 'h', 'given', 'by', 'the', 'symplectic', 'schur', 'function', 'this', 'is', 'followed', 'by', 'an', 'extension', 'to', 'a', 'qweighted', 'version', 'this', 'randomised', 'version', 'has', 'itself', 'a', 'branching', 'structure', 'and', 'is', 'related', 'to', 'a', 'qdeformation', 'of', 'the', 'so_2n1whittaker', 'functions', 'in', 'chapter', '5', 'we', 'present', 'a', 'fully', 'randomised', 'process', 'this', 'process', 'qdeforms', 'a', 'process', 'proposed', 'in', 'ww09', 'in', 'chapter', '7', 'we', 'prove', 'the', 'convergence', 'of', 'the', 'qdeformation', 'of', 'the', 'so_2n1whittaker', 'functions', 'to', 'the', 'classical', 'so_2n1whittaker', 'functions', 'when', 'q', 'to', '1', 'finally', 'in', 'chapter', '8', 'we', 'turn', 'our', 'interest', 'to', 'the', 'continuous', 'setting', 'and', 'construct', 'a', 'process', 'on', 'patterns', 'which', 'contains', 'a', 'positive', 'temperature', 'analogue', 'of', 'the', 'dysons', 'brownian', 'motion', 'of', 'type', 'bc', 'the', 'processes', 'obtained', 'are', 'htransforms', 'of', 'brownian', 'motions', 'killed', 'at', 'a', 'continuous', 'rate', 'that', 'depends', 'on', 'their', 'distance', 'from', 'the', 'boundary', 'of', 'the', 'weyl', 'chamber', 'of', 'type', 'bc', 'with', 'h', 'related', 'with', 'the', 'so_2n1whittaker', 'functions']] | [-0.0966725114733624, 0.11501227796647906, -0.10333489926367258, 0.013413486790577434, -0.044721160099445455, -0.08917495596495287, 0.03874414333512811, 0.33815420186404366, -0.3099045204513228, -0.2096395267389756, 0.12350289726845962, -0.23952125014032324, -0.17713151545166064, 0.17071678035748475, -0.09529093801151982, 0.02501988833389394, 0.04096469604950501, 0.04421624648693476, -0.043457039530280954, -0.25063676283005315, 0.3407139725036384, 0.045334462786494695, 0.22643660614459946, 0.009312723795445996, 0.11538797242500053, 0.0385498255182531, -0.06125801535662861, -0.03128827441463154, -0.15622451264471993, 0.10982386382471626, 0.17730079604909646, 0.09384660187169482, 0.24876717208545057, -0.34960172777141324, -0.14836991412143186, 0.108462353149501, 0.1331795156953949, 0.056682585240135905, -0.038904228218115906, -0.29362087449552854, 0.0803980743821237, -0.1480145913301787, -0.15198197237149044, 0.017991095369692008, 0.05476381643083544, 0.024073792042632623, -0.2796015354784756, 0.07883538860565267, 0.11843350275486543, 0.05653928342475993, -0.005778895665310035, -0.10587649110534861, 0.01466301484522281, 0.06333578604570003, -0.0016266184452810525, 0.06714489739594044, 0.12392299229186543, -0.09926776331190139, -0.1783205887665509, 0.3494953276301369, -0.05878695032529749, -0.2416509476577791, 0.17766588681392906, -0.1734007304786442, -0.15258872922695144, 0.12169052123282496, 0.13832096218836407, 0.13154391863625187, -0.15189141849802296, 0.12595761594560656, -0.04588762173899938, 0.11307289040240959, 0.06537691660956042, -0.03661614924525194, 0.11561618880651768, 0.15647009217427293, 0.06752668198446347, 0.1902775800997875, -0.023532102889129224, -0.12441441840466462, -0.3450276587217614, -0.17852461388982957, -0.1734599904105767, 0.0995849427028729, -0.08250503594107869, -0.17626327637953487, 0.40031872870843055, 0.08781051170434648, 0.22380088139788468, 0.07730925589534891, 0.20335061956732148, 0.13255257351203045, 0.029242934933117495, 0.03737201186884915, 0.13789416887641123, 0.17764278941206346, 0.10676744616801404, -0.14262278227634645, 0.05521627974012115, 0.15130140345919238] |
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