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707.153
|
Pseudospin Magnetism in Graphene
|
We predict that neutral graphene bilayers are pseudospin magnets in which the
charge density-contribution from each valley and spin spontaneously shifts to
one of the two layers. The band structure of this system is characterized by a
momentum-space vortex which is responsible for unusual competition between band
and kinetic energies leading to symmetry breaking in the vortex core. We
discuss the possibility of realizing a pseudospin version of ferromagnetic
metal spintronics in graphene bilayers based on hysteresis associated with this
broken symmetry.
|
cond-mat.str-el
|
we predict that neutral graphene bilayers are pseudospin magnets in which the charge densitycontribution from each valley and spin spontaneously shifts to one of the two layers the band structure of this system is characterized by a momentumspace vortex which is responsible for unusual competition between band and kinetic energies leading to symmetry breaking in the vortex core we discuss the possibility of realizing a pseudospin version of ferromagnetic metal spintronics in graphene bilayers based on hysteresis associated with this broken symmetry
|
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|
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|
707.1531
|
Spin and orbital magnetic response in metals: susceptibility and NMR
shifts
|
A DFT-based method is presented which allows the computation of all-electron
NMR shifts of metallic compounds with periodic boundary conditions. NMR shifts
in metals measure two competing physical phenomena. Electrons interact with the
applied magnetic field (i) as magnetic dipoles (or spins), resulting in the
Knight shift, (ii) as moving electric charges, resulting in the chemical (or
orbital) shift. The latter is treated through an extension to metals of the
Gauge Invariant Projector Augment Wave(GIPAW) developed for insulators. The
former is modeled as the hyperfine interaction between the electronic spin
polarization and the nuclear dipoles. NMR shifts are obtained with respect to
the computed shieldings of reference compounds, yielding fully ab-initio
quantities which are directly comparable to experiment. The method is validated
by comparing the magnetic susceptibility of interacting and non-interacting
homogeneous gas with known analytical results, and by comparing the computed
NMR shifts of simple metals with experiment.
|
cond-mat.mtrl-sci
|
a dftbased method is presented which allows the computation of allelectron nmr shifts of metallic compounds with periodic boundary conditions nmr shifts in metals measure two competing physical phenomena electrons interact with the applied magnetic field i as magnetic dipoles or spins resulting in the knight shift ii as moving electric charges resulting in the chemical or orbital shift the latter is treated through an extension to metals of the gauge invariant projector augment wavegipaw developed for insulators the former is modeled as the hyperfine interaction between the electronic spin polarization and the nuclear dipoles nmr shifts are obtained with respect to the computed shieldings of reference compounds yielding fully abinitio quantities which are directly comparable to experiment the method is validated by comparing the magnetic susceptibility of interacting and noninteracting homogeneous gas with known analytical results and by comparing the computed nmr shifts of simple metals with experiment
|
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|
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|
707.1532
|
Sorting and Selection in Posets
|
Classical problems of sorting and searching assume an underlying linear
ordering of the objects being compared. In this paper, we study a more general
setting, in which some pairs of objects are incomparable. This generalization
is relevant in applications related to rankings in sports, college admissions,
or conference submissions. It also has potential applications in biology, such
as comparing the evolutionary fitness of different strains of bacteria, or
understanding input-output relations among a set of metabolic reactions or the
causal influences among a set of interacting genes or proteins. Our results
improve and extend results from two decades ago of Faigle and Tur\'{a}n.
A measure of complexity of a partially ordered set (poset) is its width. Our
algorithms obtain information about a poset by queries that compare two
elements. We present an algorithm that sorts, i.e. completely identifies, a
width w poset of size n and has query complexity O(wn + nlog(n)), which is
within a constant factor of the information-theoretic lower bound. We also show
that a variant of Mergesort has query complexity O(wn(log(n/w))) and total
complexity O((w^2)nlog(n/w)). Faigle and Tur\'{a}n have shown that the sorting
problem has query complexity O(wn(log(n/w))) but did not address its total
complexity.
For the related problem of determining the minimal elements of a poset, we
give efficient deterministic and randomized algorithms with O(wn) query and
total complexity, along with matching lower bounds for the query complexity up
to a factor of 2. We generalize these results to the k-selection problem of
determining the elements of height at most k. We also derive upper bounds on
the total complexity of some other problems of a similar flavor.
|
cs.DS cs.DM
|
classical problems of sorting and searching assume an underlying linear ordering of the objects being compared in this paper we study a more general setting in which some pairs of objects are incomparable this generalization is relevant in applications related to rankings in sports college admissions or conference submissions it also has potential applications in biology such as comparing the evolutionary fitness of different strains of bacteria or understanding inputoutput relations among a set of metabolic reactions or the causal influences among a set of interacting genes or proteins our results improve and extend results from two decades ago of faigle and turan a measure of complexity of a partially ordered set poset is its width our algorithms obtain information about a poset by queries that compare two elements we present an algorithm that sorts ie completely identifies a width w poset of size n and has query complexity own nlogn which is within a constant factor of the informationtheoretic lower bound we also show that a variant of mergesort has query complexity ownlognw and total complexity ow2nlognw faigle and turan have shown that the sorting problem has query complexity ownlognw but did not address its total complexity for the related problem of determining the minimal elements of a poset we give efficient deterministic and randomized algorithms with own query and total complexity along with matching lower bounds for the query complexity up to a factor of 2 we generalize these results to the kselection problem of determining the elements of height at most k we also derive upper bounds on the total complexity of some other problems of a similar flavor
|
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|
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|
707.1533
|
The Fate of Dwarf Galaxies in Clusters and the Origin of Intracluster
Stars. I. Isolated Clusters
|
The main goal of this paper is to compare the relative importance of
destruction by tides, vs. destruction by mergers, in order to assess if tidal
destruction of dwarf galaxies in clusters is a viable scenario for explaining
the origin of intracluster stars. We have designed a simple algorithm for
simulating the evolution of isolated clusters. The distribution of galaxies in
the cluster is evolved using a direct gravitational N-body algorithm combined
with a subgrid treatment of physical processes such as mergers, tidal
disruption, and galaxy harassment. Using this algorithm, we have performed a
total of 227 simulations. Our main results are (1) destruction of dwarf
galaxies by mergers dominates over destruction by tides, and (2) the
destruction of dwarf galaxies by tides is sufficient to explain the observed
intracluster light in clusters.
|
astro-ph
|
the main goal of this paper is to compare the relative importance of destruction by tides vs destruction by mergers in order to assess if tidal destruction of dwarf galaxies in clusters is a viable scenario for explaining the origin of intracluster stars we have designed a simple algorithm for simulating the evolution of isolated clusters the distribution of galaxies in the cluster is evolved using a direct gravitational nbody algorithm combined with a subgrid treatment of physical processes such as mergers tidal disruption and galaxy harassment using this algorithm we have performed a total of 227 simulations our main results are 1 destruction of dwarf galaxies by mergers dominates over destruction by tides and 2 the destruction of dwarf galaxies by tides is sufficient to explain the observed intracluster light in clusters
|
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|
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|
707.1534
|
An Architecture Framework for Complex Data Warehouses
|
Nowadays, many decision support applications need to exploit data that are
not only numerical or symbolic, but also multimedia, multistructure,
multisource, multimodal, and/or multiversion. We term such data complex data.
Managing and analyzing complex data involves a lot of different issues
regarding their structure, storage and processing, and metadata are a key
element in all these processes. Such problems have been addressed by classical
data warehousing (i.e., applied to "simple" data). However, data warehousing
approaches need to be adapted for complex data. In this paper, we first propose
a precise, though open, definition of complex data. Then we present a general
architecture framework for warehousing complex data. This architecture heavily
relies on metadata and domain-related knowledge, and rests on the XML language,
which helps storing data, metadata and domain-specific knowledge altogether,
and facilitates communication between the various warehousing processes.
|
cs.DB
|
nowadays many decision support applications need to exploit data that are not only numerical or symbolic but also multimedia multistructure multisource multimodal andor multiversion we term such data complex data managing and analyzing complex data involves a lot of different issues regarding their structure storage and processing and metadata are a key element in all these processes such problems have been addressed by classical data warehousing ie applied to simple data however data warehousing approaches need to be adapted for complex data in this paper we first propose a precise though open definition of complex data then we present a general architecture framework for warehousing complex data this architecture heavily relies on metadata and domainrelated knowledge and rests on the xml language which helps storing data metadata and domainspecific knowledge altogether and facilitates communication between the various warehousing processes
|
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|
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|
707.1535
|
Unparticle physics effects in B_s mixing
|
We investigate unparticle effects in B_s mixing. In particular we discuss the
possibility of reproducing the experimental result of \Delta M_s, while having
large effects on the mixing phase \phi_s, which might be visible in current
experiments.
|
hep-ph hep-ex
|
we investigate unparticle effects in b_s mixing in particular we discuss the possibility of reproducing the experimental result of delta m_s while having large effects on the mixing phase phi_s which might be visible in current experiments
|
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|
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|
707.1536
|
Dark Matter and Particle Physics
|
[A brief review intended for a general physics colloquium audience.]
Astrophysicists now know that 80% of the matter in the universe is `dark
matter', composed of neutral and weakly interacting elementary particles that
are not part of the Standard Model of particle physics. I will summarize the
evidence for dark matter. I will explain why I expect dark matter particles to
be produced at the CERN LHC. We will then need to characterize the new weakly
interacting particles and demonstrate that they are the same particles that are
found in the cosmos. I will describe how this might be done.
|
hep-ph astro-ph
|
a brief review intended for a general physics colloquium audience astrophysicists now know that 80 of the matter in the universe is dark matter composed of neutral and weakly interacting elementary particles that are not part of the standard model of particle physics i will summarize the evidence for dark matter i will explain why i expect dark matter particles to be produced at the cern lhc we will then need to characterize the new weakly interacting particles and demonstrate that they are the same particles that are found in the cosmos i will describe how this might be done
|
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|
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|
707.1537
|
Numerical Modeling of AGN Jets: Formation of Magnetically Dominated
Lobes and Stability Properties of Current-carrying Jets
|
We argue the behavior of Poynting flux-dominated outflows from AGN in the
galactic cluster systems by performing three-dimensional MHD simulations within
the framework of the "magnetic tower" model. Of particular interests are the
structure of MHD waves, the cylindrical radial force balance, the
(de)collimation, and the stability properties of magnetic tower jets.
Transition between the jet/lobe and the formation of wiggling jet by growing
current-driven instability are discussed.
|
astro-ph
|
we argue the behavior of poynting fluxdominated outflows from agn in the galactic cluster systems by performing threedimensional mhd simulations within the framework of the magnetic tower model of particular interests are the structure of mhd waves the cylindrical radial force balance the decollimation and the stability properties of magnetic tower jets transition between the jetlobe and the formation of wiggling jet by growing currentdriven instability are discussed
|
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|
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|
707.1538
|
Transition temperature of the homogeneous and dilute Bose gas in
D-dimensions
|
The phase transition temperature of the homogeneous and dilute Bose gas in
D-dimensions ($2 \le D \le 3$) is calculated by a mean field-based statistical
method. The shift of the phase transition temperature is written up to the
leading order as $\Delta T_c/T_c^0 = c \gam^{\al}$, where $\gam=n^{1/3}a$.
We derived Huang's result of the phase transition temperature in the
generalized dimensions. We show that $ c(D)$ is positive and
$\al(D)=2(D/2-1)^2$ in the short-wavelength range. The origin of the difference
between $\al=1/2$ and $\al=1$ at D=3 is discussed. The $T_c$ at D=2 is
calculated in the same scheme. The result is compared with Fisher and
Hohenberg's KT temperature.
|
cond-mat.stat-mech
|
the phase transition temperature of the homogeneous and dilute bose gas in ddimensions 2 le d le 3 is calculated by a mean fieldbased statistical method the shift of the phase transition temperature is written up to the leading order as delta t_ct_c0 c gamal where gamn13a we derived huangs result of the phase transition temperature in the generalized dimensions we show that cd is positive and ald2d212 in the shortwavelength range the origin of the difference between al12 and al1 at d3 is discussed the t_c at d2 is calculated in the same scheme the result is compared with fisher and hohenbergs kt temperature
|
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|
[-0.11017984084330737, 0.19049237839256725, -0.039844682088633086, 0.006820753869582333, 0.060551876900717616, -0.13246894937793852, 0.050390884316727225, 0.3411908399236078, -0.21787594797491444, -0.2696771312484463, 0.05283738402238883, -0.3180012229793504, -0.0862859286112236, 0.13305073846862012, 0.019366185395412294, 0.004928545779822504, -0.09876400317458034, 0.06959195235999775, -0.13289199304520427, -0.22631325853952006, 0.28989822607414395, 0.02630745797924807, 0.2623559661191322, 0.09408721355972446, 0.061487668979109504, -0.04745564478741703, 0.033630509952119754, 0.020099151222144857, -0.2028915913363687, -0.0038209635988060457, 0.2358113365703235, 0.035016564036007315, 0.17635943400947487, -0.29109578356877264, -0.21009182793033473, 0.08322162197802362, 0.12082989203433196, 0.0834881194656619, -0.007895326524899871, -0.24736431216382804, 0.06502747039000194, -0.1410036935452737, -0.14861930612424462, -0.044629801493868526, 0.03959113994941992, -0.014944910975720952, -0.29717940203936805, 0.1640729674882274, 0.08815111470974836, 0.07248727652340141, -0.03453653378928007, -0.16650721007118038, -0.02578385881212193, 0.07585685328105647, -0.0011400624917929664, 0.11123260156155619, 0.08144636450371906, -0.07856824020763822, -0.026397931962456628, 0.38462152868947563, -0.13287622675267688, -0.08191504756755688, 0.1490768257313974, -0.20386261628557215, -0.07034700653771413, 0.16991425477032202, 0.09637367525411879, 0.11634049476889036, -0.08237693757366608, 0.1246969385698036, 0.012854995498178052, 0.1821614038655717, 0.09833950860946275, -0.023553175497891418, 0.14872011958847425, 0.14695497044343866, 0.014279537814824531, 0.1194427560275311, -0.11135610468530406, -0.09562022407429621, -0.2959854395731407, -0.16927730652741066, -0.22449170782541236, 0.014652841505320632, -0.13816513354814722, -0.10305011274256543, 0.3193549372647206, 0.1295930078417501, 0.19800301329871894, 0.03300849584960744, 0.23001840065562112, 0.15457223631400505, -0.008297769940576936, 0.09515345937745902, 0.24486652195599734, 0.1678201737745172, 0.14086879031075275, -0.262894770545958, 0.011310726344841076, 0.09482268123275728]
|
707.1539
|
Conjugacy classes and invariant subrings of R-automorphisms of R[x]
|
We consider the group G of R-automorphisms of the polynomial ring R[x]
especially in the case where R is the ring of integers modulo n. We describe
conjugacy classes in G, and in the case where n = 4, we describe more
explicitly the structure of G and determine all rings of invariants of R[x]
with respect to subgroups of G.
|
math.AC
|
we consider the group g of rautomorphisms of the polynomial ring rx especially in the case where r is the ring of integers modulo n we describe conjugacy classes in g and in the case where n 4 we describe more explicitly the structure of g and determine all rings of invariants of rx with respect to subgroups of g
|
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|
[-0.2638378619449213, 0.038020723530927954, -0.03578283884010072, -0.025404139980279163, -0.030062103640067124, -0.14704470153329735, -0.04367646496048418, 0.35284048981838306, -0.312229418795619, -0.261896640556604, 0.07652752463887366, -0.2580973958059893, -0.10167335378306018, 0.16575269698228498, -0.053810920124336824, -0.07528269960213516, -0.003929510665268211, 0.16909825589539387, -0.06518391039917025, -0.3080859132174213, 0.37759761682758897, -0.05333845967711028, 0.11736953248846013, -0.027850520149883578, 0.03674703097697032, 0.021357048770523298, -0.04634600241621167, 0.005782939075350256, -0.15515525571181107, 0.0703601835086405, 0.29941419925603824, 0.07715540050067228, 0.17796243863353917, -0.38147665258749563, -0.0705327189416956, 0.24233135549446283, 0.13035476059352946, -0.05618628818083996, 0.048970198963908876, -0.19528103319107223, 0.1800313266033654, -0.2073285138329207, -0.14605922424047002, 0.0017206870114146653, 0.18621711058826265, 0.05813357391852444, -0.2602124383201491, -0.003845667876934601, 0.0742284721237118, 0.10229684464570324, 0.0012687461892679586, -0.10437855920044042, -8.848195863982378e-07, 0.09352334380402404, -0.01098799069167383, -0.008536442419735052, 0.05006362869546323, -0.1269012217930818, -0.08074383137814732, 0.4525804891550945, -0.0817137146526474, -0.16357188589744648, 0.11243461484436766, -0.27131509589883734, -0.19348673451439305, 0.08945090115322905, 0.11679295811928429, 0.2256771294652658, -0.0017911667266655397, 0.24643831118996554, -0.14548888911445768, 0.10175169501611489, 0.06960504993764778, 0.0032178853969957867, 0.11066815408609681, 0.07141313162016666, 0.06702259156983188, 0.19869532009933966, -0.01711716815450434, 0.0965873477428015, -0.35045697224342215, -0.16701641118438063, -0.14517756140498855, 0.09715379967938288, -0.10207066512064834, -0.11459335340660508, 0.43778089635958106, 0.08875614269715497, 0.18695001042116496, 0.07204546685472636, 0.1687685481067431, 0.03463367871561293, 0.04201064274598986, 0.13075949806499026, 0.07693993252844124, 0.21912487987744605, -0.11531213879332704, -0.23131318167009848, -0.03048254439796684, 0.1277194543568007]
|
707.154
|
Two-Frequency Radiative Transfer. II: Maxwell Equations in Random
Dielectrics
|
The paper addresses the space-frequency correlations of electromagnetic waves
in general random, bi-anisotropic media whose constitutive tensors are complex
Hermitian matrices. The two-frequency Wigner distribution (2f-WD) for polarized
waves is introduced to describe the space-frequency correlations and the closed
form Wigner-Moyal equation is derived from the Maxwell equations. Two-frequency
radiative transfer (2f-RT) equations is then derived from the Wigner-Moyal
equation by using the multiple scale expansion. For the simplest isotropic
medium, the result coincides with Chandrasekhar's transfer equation. In
birefringent media, the 2f-RT equations take the scalar form due to the absence
of depolarization. A number of birefringent media such as the chiral, uniaxial
and gyrotropic media are examined. For the unpolarized wave in the isotropic
medium the 2f-RT equations reduces to the Fokker-Planck equation previously
derived in Part I. A similar Fokker-Planck equation is derived from the scalar
2f-RT equation for the birefringent media.
|
physics.optics
|
the paper addresses the spacefrequency correlations of electromagnetic waves in general random bianisotropic media whose constitutive tensors are complex hermitian matrices the twofrequency wigner distribution 2fwd for polarized waves is introduced to describe the spacefrequency correlations and the closed form wignermoyal equation is derived from the maxwell equations twofrequency radiative transfer 2frt equations is then derived from the wignermoyal equation by using the multiple scale expansion for the simplest isotropic medium the result coincides with chandrasekhars transfer equation in birefringent media the 2frt equations take the scalar form due to the absence of depolarization a number of birefringent media such as the chiral uniaxial and gyrotropic media are examined for the unpolarized wave in the isotropic medium the 2frt equations reduces to the fokkerplanck equation previously derived in part i a similar fokkerplanck equation is derived from the scalar 2frt equation for the birefringent media
|
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|
[-0.15629944010990962, 0.15699448300332858, -0.05180513140713346, 0.05966106562971555, -0.13383851325187576, -0.1054760737400823, -0.1051764590553297, 0.309987485254633, -0.2793245396737395, -0.19674446711252475, 0.020731027800075966, -0.31537746696989855, -0.15276621299763693, 0.15781776881937323, 0.09336795378636954, 0.08910877242491677, -0.029091575616521054, -0.020069968475606936, -0.05895421684173675, -0.13636910073009545, 0.4016837223593531, -0.02075546181696499, 0.30306431481871626, -0.02559730087864566, 0.15850688677666516, 0.03759245253970911, -0.04525001717667127, -0.029115449769647216, -0.10728091858006243, 0.03245326447589644, 0.21625904497883186, 0.011083943003403216, 0.16841548060163342, -0.4600540205836296, -0.2865149348010791, 0.037778991280958574, 0.13965426948692264, 0.17884828349382714, -0.02568743647044075, -0.3271307142258718, -0.011343046900784148, -0.1562310842732931, -0.21857327564201992, -0.032083027122606494, 0.019346451727223806, 0.04858663705787782, -0.27465220615910046, 0.14314712716973033, 0.048736929888676464, -0.010310869082680037, -0.12929245424617467, -0.09695110318074324, -0.010924884927426947, 0.03010625512628206, 0.03488568767006027, -0.01961055275630848, 0.07834769135003845, -0.16225974327756157, -0.00754558317973439, 0.45719433646520663, -0.10748604122741982, -0.2845505637662678, 0.07206613465758233, -0.14749284963091386, -0.01826239917748447, 0.1853675693193258, 0.18682512997103662, 0.11207022799243187, -0.21015032227953961, 0.09501133650011415, -0.09516367422535228, 0.12553206876096926, 0.11520894447277333, -0.01268188837265339, 0.1310128399781112, 0.07284499202887046, -0.041469604369445606, 0.15438081761500957, 0.0067403747603811065, -0.12799237025259383, -0.3000754261553962, -0.15589344638383723, -0.19358691754750906, 0.12785583010037702, -0.1342741154010833, -0.17475613654944402, 0.3305571248144682, 0.10752212529167018, 0.06905802611646981, 0.01375714632329242, 0.2839893996795832, 0.2031867223430489, 0.01658577063474162, 0.0912983252570547, 0.2713642531042469, 0.281832162684215, 0.19850004450899775, -0.23792765010630004, 0.01283069491579101, 0.09234738673629432]
|
707.1541
|
Why we should teach the Bohr model and how to teach it effectively
|
Some education researchers have claimed that we should not teach the Bohr
model of the atom because it inhibits students' ability to learn the true
quantum nature of electrons in atoms. Although the evidence for this claim is
weak, many have accepted it. This claim has implications for how to present
atoms in classes ranging from elementary school to graduate school. We present
results from a study designed to test this claim by developing a curriculum on
models of the atom, including the Bohr and Schrodinger models. We examine
student descriptions of atoms on final exams in transformed modern physics
classes using various versions of this curriculum. We find that if the
curriculum does not include sufficient connections between different models,
many students still have a Bohr-like view of atoms, rather than a more accurate
Schrodinger model. However, with an improved curriculum designed to develop
model-building skills and with better integration between different models, it
is possible to get most students to describe atoms using the Schrodinger model.
In comparing our results with previous research, we find that comparing and
contrasting different models is a key feature of a curriculum that helps
students move beyond the Bohr model and adopt Schrodinger's view of the atom.
We find that understanding the reasons for the development of models is much
more difficult for students than understanding the features of the models. We
also present interactive computer simulations designed to help students build
models of the atom more effectively.
|
physics.ed-ph
|
some education researchers have claimed that we should not teach the bohr model of the atom because it inhibits students ability to learn the true quantum nature of electrons in atoms although the evidence for this claim is weak many have accepted it this claim has implications for how to present atoms in classes ranging from elementary school to graduate school we present results from a study designed to test this claim by developing a curriculum on models of the atom including the bohr and schrodinger models we examine student descriptions of atoms on final exams in transformed modern physics classes using various versions of this curriculum we find that if the curriculum does not include sufficient connections between different models many students still have a bohrlike view of atoms rather than a more accurate schrodinger model however with an improved curriculum designed to develop modelbuilding skills and with better integration between different models it is possible to get most students to describe atoms using the schrodinger model in comparing our results with previous research we find that comparing and contrasting different models is a key feature of a curriculum that helps students move beyond the bohr model and adopt schrodingers view of the atom we find that understanding the reasons for the development of models is much more difficult for students than understanding the features of the models we also present interactive computer simulations designed to help students build models of the atom more effectively
|
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|
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|
707.1542
|
Noncommutative geometry through monoidal categories I
|
After introducing a noncommutative counterpart of commutative algebraic
geometry based on monoidal categories of quasi-coherent sheaves we show that
various constructions in noncommutative geometry (e.g. Morita equivalences,
Hopf-Galois extensions) can be given geometric meaning extending their
geometric interpretations in the commutative case. On the other hand, we show
that some constructions in commutative geometry (e.g. faithfully flat descent
theory, principal fibrations, equivariant and infinitesimal geometry) can be
interpreted as noncommutative geometric constructions applied to commutative
objects. For such generalized geometry we define global invariants constructing
cyclic objects from which we derive Hochschild, cyclic and periodic cyclic
homology (with coefficients) in the standard way.
|
math.AG math.KT
|
after introducing a noncommutative counterpart of commutative algebraic geometry based on monoidal categories of quasicoherent sheaves we show that various constructions in noncommutative geometry eg morita equivalences hopfgalois extensions can be given geometric meaning extending their geometric interpretations in the commutative case on the other hand we show that some constructions in commutative geometry eg faithfully flat descent theory principal fibrations equivariant and infinitesimal geometry can be interpreted as noncommutative geometric constructions applied to commutative objects for such generalized geometry we define global invariants constructing cyclic objects from which we derive hochschild cyclic and periodic cyclic homology with coefficients in the standard way
|
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|
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|
707.1543
|
A New Experiment to Study Hyperon CP Violation and the Charmonium System
|
Fermilab operates the world's most intense antiproton source, now exclusively
dedicated to serving the needs of the Tevatron Collider. The anticipated 2009
shutdown of the Tevatron presents the opportunity for a world-leading low- and
medium-energy antiproton program. We summarize the status of the Fermilab
antiproton facility and review physics topics for which a future experiment
could make the world's best measurements.
|
hep-ex
|
fermilab operates the worlds most intense antiproton source now exclusively dedicated to serving the needs of the tevatron collider the anticipated 2009 shutdown of the tevatron presents the opportunity for a worldleading low and mediumenergy antiproton program we summarize the status of the fermilab antiproton facility and review physics topics for which a future experiment could make the worlds best measurements
|
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|
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|
707.1544
|
Quintessential Kination and Leptogenesis
|
Thermal leptogenesis induced by the CP-violating decay of a right-handed
neutrino (RHN) is discussed in the background of quintessential kination, i.e.,
in a cosmological model where the energy density of the early Universe is
assumed to be dominated by the kinetic term of a quintessence field during some
epoch of its evolution. This assumption may lead to very different
observational consequences compared to the case of a standard cosmology where
the energy density of the Universe is dominated by radiation. We show that,
depending on the choice of the temperature T_r above which kination dominates
over radiation, any situation between the strong and the super--weak wash--out
regime are equally viable for leptogenesis, even with the RHN Yukawa coupling
fixed to provide the observed atmospheric neutrino mass scale ~ 0.05 eV. For M<
T_r < M/100, i.e., when kination stops to dominate at a time which is not much
later than when leptogenesis takes place, the efficiency of the process,
defined as the ratio between the produced lepton asymmetry and the amount of CP
violation in the RHN decay, can be larger than in the standard scenario of
radiation domination. This possibility is limited to the case when the neutrino
mass scale is larger than about 0.01 eV. The super--weak wash--out regime is
obtained for T_r << M/100, and includes the case when T_r is close to the
nucleosynthesis temperature ~ 1 MeV. Irrespective of T_r, we always find a
sufficient window above the electroweak temperature T ~ 100 GeV for the
sphaleron transition to thermalize, so that the lepton asymmetry can always be
converted to the observed baryon asymmetry.
|
astro-ph hep-ph
|
thermal leptogenesis induced by the cpviolating decay of a righthanded neutrino rhn is discussed in the background of quintessential kination ie in a cosmological model where the energy density of the early universe is assumed to be dominated by the kinetic term of a quintessence field during some epoch of its evolution this assumption may lead to very different observational consequences compared to the case of a standard cosmology where the energy density of the universe is dominated by radiation we show that depending on the choice of the temperature t_r above which kination dominates over radiation any situation between the strong and the superweak washout regime are equally viable for leptogenesis even with the rhn yukawa coupling fixed to provide the observed atmospheric neutrino mass scale 005 ev for m t_r m100 ie when kination stops to dominate at a time which is not much later than when leptogenesis takes place the efficiency of the process defined as the ratio between the produced lepton asymmetry and the amount of cp violation in the rhn decay can be larger than in the standard scenario of radiation domination this possibility is limited to the case when the neutrino mass scale is larger than about 001 ev the superweak washout regime is obtained for t_r m100 and includes the case when t_r is close to the nucleosynthesis temperature 1 mev irrespective of t_r we always find a sufficient window above the electroweak temperature t 100 gev for the sphaleron transition to thermalize so that the lepton asymmetry can always be converted to the observed baryon asymmetry
|
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|
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|
707.1545
|
Dynamics in Nonlocal Cosmological Models Derived from String Field
Theory
|
A general class of nonlocal cosmological models is considered. A new method
for solving nonlocal Friedmann equations is proposed, and solutions of the
Friedmann equations with nonlocal operator are presented. The cosmological
properties of these solutions are discussed. Especially indicated is $p$-adic
cosmological model in which we have obtained nonsingular bouncing solution and
string field theory tachyon model in which we have obtained full solution of
nonlocal Friedmann equations with $w=-1$ at large times. The possibility of
obtaining realistic value of cosmological constant from nonlocal cosmological
models is also discussed.
|
hep-th astro-ph gr-qc
|
a general class of nonlocal cosmological models is considered a new method for solving nonlocal friedmann equations is proposed and solutions of the friedmann equations with nonlocal operator are presented the cosmological properties of these solutions are discussed especially indicated is padic cosmological model in which we have obtained nonsingular bouncing solution and string field theory tachyon model in which we have obtained full solution of nonlocal friedmann equations with w1 at large times the possibility of obtaining realistic value of cosmological constant from nonlocal cosmological models is also discussed
|
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|
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|
707.1546
|
Producing an Intense, Cool Muon Beam via e+e- Annihilation
|
We consider a highly unconventional approach to generating muon and antimuon
bunches for a neutrino factory or muon collider: electron-positron annihilation
just above muon-antimuon threshold. This approach can produce low-emittance
bunches at high energy, easing the muon-cooling and acceleration challenges in
such facilities. However, the small (< 1 $\mu$b) useable production cross
section means that extraordinary beam-power and targeting challenges would have
to be met. We speculate on what this might entail.
|
physics.acc-ph
|
we consider a highly unconventional approach to generating muon and antimuon bunches for a neutrino factory or muon collider electronpositron annihilation just above muonantimuon threshold this approach can produce lowemittance bunches at high energy easing the muoncooling and acceleration challenges in such facilities however the small 1 mub useable production cross section means that extraordinary beampower and targeting challenges would have to be met we speculate on what this might entail
|
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|
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|
707.1547
|
The Next Geminga: Search for Radio and X-ray Pulsations from the Neutron
Star Identified with 3EG J1835+5918
|
We report unsuccessful searches for pulsations from the neutron star RX
J1836.2+5925 identified with the EGRET source 3EG J1835+5918. A 24 hr
observation with the NRAO Green Bank Telescope at 820 MHz placed an upper limit
on flux density of 17 uJy for P > 10 ms, and gradually increasing limits for 1
< P < 10 ms. The equivalent luminosity is lower than that of any known pulsar
with the possible exception of the radio-quiet gamma-ray pulsar Geminga. A set
of observations with the Chandra X-ray Observatory HRC totaling 118 ks revealed
no pulsar with 1 ms < P < 10 s. The upper limit on its pulsed fraction is 35%
assuming a sinusoidal pulse shape. The position of RX J1836.2+5925 in Chandra
observations separated by 3 years is unchanged within errors, leading to an
upper limit on its proper motion of <0.14"/yr, or v < 530 km/s at d = 800 pc, a
maximum distance estimated from its thermal X-ray spectrum. With these null
results, the properties of 3EG J1835+5918 and its X-ray counterpart RX
J1836.2+5925 are consistent with a more distant or older version of Geminga, or
perhaps a recycled pulsar. Having nearly exhausted the capabilities of current
instrumentation at all wavelengths, it will likely fall to the Gamma-ray Large
Area Space Telescope to discover pulsations from 3EG J1835+5918.
|
astro-ph
|
we report unsuccessful searches for pulsations from the neutron star rx j183625925 identified with the egret source 3eg j18355918 a 24 hr observation with the nrao green bank telescope at 820 mhz placed an upper limit on flux density of 17 ujy for p 10 ms and gradually increasing limits for 1 p 10 ms the equivalent luminosity is lower than that of any known pulsar with the possible exception of the radioquiet gammaray pulsar geminga a set of observations with the chandra xray observatory hrc totaling 118 ks revealed no pulsar with 1 ms p 10 s the upper limit on its pulsed fraction is 35 assuming a sinusoidal pulse shape the position of rx j183625925 in chandra observations separated by 3 years is unchanged within errors leading to an upper limit on its proper motion of 014yr or v 530 kms at d 800 pc a maximum distance estimated from its thermal xray spectrum with these null results the properties of 3eg j18355918 and its xray counterpart rx j183625925 are consistent with a more distant or older version of geminga or perhaps a recycled pulsar having nearly exhausted the capabilities of current instrumentation at all wavelengths it will likely fall to the gammaray large area space telescope to discover pulsations from 3eg j18355918
|
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|
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|
707.1548
|
Data Mining-based Materialized View and Index Selection in Data
Warehouses
|
Materialized views and indexes are physical structures for accelerating data
access that are casually used in data warehouses. However, these data
structures generate some maintenance overhead. They also share the same storage
space. Most existing studies about materialized view and index selection
consider these structures separately. In this paper, we adopt the opposite
stance and couple materialized view and index selection to take view-index
interactions into account and achieve efficient storage space sharing.
Candidate materialized views and indexes are selected through a data mining
process. We also exploit cost models that evaluate the respective benefit of
indexing and view materialization, and help select a relevant configuration of
indexes and materialized views among the candidates. Experimental results show
that our strategy performs better than an independent selection of materialized
views and indexes.
|
cs.DB
|
materialized views and indexes are physical structures for accelerating data access that are casually used in data warehouses however these data structures generate some maintenance overhead they also share the same storage space most existing studies about materialized view and index selection consider these structures separately in this paper we adopt the opposite stance and couple materialized view and index selection to take viewindex interactions into account and achieve efficient storage space sharing candidate materialized views and indexes are selected through a data mining process we also exploit cost models that evaluate the respective benefit of indexing and view materialization and help select a relevant configuration of indexes and materialized views among the candidates experimental results show that our strategy performs better than an independent selection of materialized views and indexes
|
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|
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|
707.1549
|
Fermi arcs in cuprate superconductors: tracking the pseudogap below Tc
and above T*
|
Using an energy-momentum dispersion for Bi2Sr2CaCu2O8 obtained from
angle-resolved photoelectron spectroscopy we show that the shrinking Fermi arc
model of the pseudogap is inconsistent with Raman scattering below Tc and
specific heat near T*. By simulating the quasiparticle energy dispersion curves
we show that Fermi arcs are an artifact of a T-dependent scattering rate.
|
cond-mat.supr-con
|
using an energymomentum dispersion for bi2sr2cacu2o8 obtained from angleresolved photoelectron spectroscopy we show that the shrinking fermi arc model of the pseudogap is inconsistent with raman scattering below tc and specific heat near t by simulating the quasiparticle energy dispersion curves we show that fermi arcs are an artifact of a tdependent scattering rate
|
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|
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|
707.155
|
Search for Single Top Quark Production Using Likelihood Discriminants at
D0 in Run II
|
We present an improved search for single top quarks in two production modes,
s-channel (tb) and t-channel (tqb). The search is performed in the
electron+jets and muon+jets decay channels, with one or more b-tagged jets, on
nearly 370 pb^{-1} of D0 Run II data collected between August 2002 and October
2004. Impact-parameter based b-quark tagging is used to select signal-like
events. We use a likelihood discriminant method to separate signals from
backgrounds. The resulting expected/observed 95% confidence level upper limits
on the single top quark production cross sections are 3.3/5.0pb (s-channel) and
4.3/4.4pb (t-channel).
|
hep-ex
|
we present an improved search for single top quarks in two production modes schannel tb and tchannel tqb the search is performed in the electronjets and muonjets decay channels with one or more btagged jets on nearly 370 pb1 of d0 run ii data collected between august 2002 and october 2004 impactparameter based bquark tagging is used to select signallike events we use a likelihood discriminant method to separate signals from backgrounds the resulting expectedobserved 95 confidence level upper limits on the single top quark production cross sections are 3350pb schannel and 4344pb tchannel
|
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|
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|
707.1551
|
Regulatory Dynamics on Random Networks: Asymptotic Periodicity and
Modularity
|
We study the dynamics of discrete-time regulatory networks on random
digraphs. For this we define ensembles of deterministic orbits of random
regulatory networks, and introduce some statistical indicators related to the
long-term dynamics of the system. We prove that, in a random regulatory
network, initial conditions converge almost surely to a periodic attractor. We
study the subnetworks, which we call modules, where the periodic asymptotic
oscillations are concentrated. We proof that those modules are dynamically
equivalent to independent regulatory networks.
|
math.DS
|
we study the dynamics of discretetime regulatory networks on random digraphs for this we define ensembles of deterministic orbits of random regulatory networks and introduce some statistical indicators related to the longterm dynamics of the system we prove that in a random regulatory network initial conditions converge almost surely to a periodic attractor we study the subnetworks which we call modules where the periodic asymptotic oscillations are concentrated we proof that those modules are dynamically equivalent to independent regulatory networks
|
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|
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|
707.1552
|
Polynomials with a common composite
|
Let f and g be nonconstant polynomials over an arbitrary field K. In this
paper we study the intersection of the polynomial rings K[f] and K[g], and in
particular we ask whether this intersection is larger than K. We completely
resolve this question when K has characteristic zero, and in positive
characteristic we present various results, examples, and algorithms.
|
math.AG math.NT
|
let f and g be nonconstant polynomials over an arbitrary field k in this paper we study the intersection of the polynomial rings kf and kg and in particular we ask whether this intersection is larger than k we completely resolve this question when k has characteristic zero and in positive characteristic we present various results examples and algorithms
|
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|
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|
707.1553
|
Nonlinear Dirac Equations
|
We construct nonlinear extensions of Dirac's relativistic electron equation
that preserve its other desirable properties such as locality, separability,
conservation of probability and Poincar\'e invariance. We determine the
constraints that the nonlinear term must obey and classify the resultant
non-polynomial nonlinearities in a double expansion in the degree of
nonlinearity and number of derivatives. We give explicit examples of such
nonlinear equations, studying their discrete symmetries and other properties.
Motivated by some previously suggested applications we then consider nonlinear
terms that simultaneously violate Lorentz covariance and again study various
explicit examples. We contrast our equations and construction procedure with
others in the literature and also show that our equations are not gauge
equivalent to the linear Dirac equation. Finally we outline various physical
applications for these equations.
|
hep-th quant-ph
|
we construct nonlinear extensions of diracs relativistic electron equation that preserve its other desirable properties such as locality separability conservation of probability and poincare invariance we determine the constraints that the nonlinear term must obey and classify the resultant nonpolynomial nonlinearities in a double expansion in the degree of nonlinearity and number of derivatives we give explicit examples of such nonlinear equations studying their discrete symmetries and other properties motivated by some previously suggested applications we then consider nonlinear terms that simultaneously violate lorentz covariance and again study various explicit examples we contrast our equations and construction procedure with others in the literature and also show that our equations are not gauge equivalent to the linear dirac equation finally we outline various physical applications for these equations
|
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|
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|
707.1554
|
Exact Integration of the High Energy Scale in Doped Mott Insulators
|
We expand on our earlier work (cond-mat/0612130, Phys. Rev. Lett. {\bf 99},
46404 (2007)) in which we constructed the exact low-energy theory of a doped
Mott insulator by explicitly integrating (rather than projecting) out the
degrees of freedom far away from the chemical potential. The exact low-energy
theory contains degrees of freedom that cannot be obtained from projective
schemes. In particular a new charge $\pm 2e$ bosonic field emerges at low
energies that is not made out of elemental excitations. Such a field accounts
for dynamical spectral weight transfer across the Mott gap. At half-filling, we
show that two such excitations emerge which play a crucial role in preserving
the Luttinger surface along which the single-particle Green function vanishes.
In addition, the interactions with the bosonic fields defeat the artificial
local SU(2) symmetry that is present in the Heisenberg model. We also apply
this method to the Anderson-U impurity and show that in addition to the Kondo
interaction, bosonic degrees of freedom appear as well. Finally, we show that
as a result of the bosonic degree of freedom, the electron at low energies is
in a linear superposition of two excitations--one arising from the standard
projection into the low-energy sector and the other from the binding of a hole
and the boson.
|
cond-mat.str-el cond-mat.supr-con
|
we expand on our earlier work condmat0612130 phys rev lett bf 99 46404 2007 in which we constructed the exact lowenergy theory of a doped mott insulator by explicitly integrating rather than projecting out the degrees of freedom far away from the chemical potential the exact lowenergy theory contains degrees of freedom that cannot be obtained from projective schemes in particular a new charge pm 2e bosonic field emerges at low energies that is not made out of elemental excitations such a field accounts for dynamical spectral weight transfer across the mott gap at halffilling we show that two such excitations emerge which play a crucial role in preserving the luttinger surface along which the singleparticle green function vanishes in addition the interactions with the bosonic fields defeat the artificial local su2 symmetry that is present in the heisenberg model we also apply this method to the andersonu impurity and show that in addition to the kondo interaction bosonic degrees of freedom appear as well finally we show that as a result of the bosonic degree of freedom the electron at low energies is in a linear superposition of two excitationsone arising from the standard projection into the lowenergy sector and the other from the binding of a hole and the boson
|
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|
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|
707.1555
|
Changeover from Glassy ferromagnetism of the orbital domain state to
long range ferromagnetic ordering in La{_{0.9}}Sr_{0.1}MnO{_3}
|
An attempt is made to resolve the controversy related to the low temperature
phase (ground state) of the low-doped ferromagnetic (FM)- insulator(I)
manganite through bulk magnetic measurements on La${_{0.9}}$Sr$_{0.1}$MnO${_3}$
sample. It is shown that the FM phase, formed out of well defined transition in
the low-doped system, becomes inhomogeneous with decrease in temperature. This
inhomogeniety is considered to be an outcome of the formation of orbital domain
state of e$_g$-electrons having hole rich (metallic) walls separating the hole
deficient (insulating) regions. The resulting complexity brings in
metastability and glassy behaviour within the FM phase at low temperature,
however, with no resemblance to spin glass, cluster glass or reentrant phases.
It shows ageing effect without memory but magnetic relaxation shows signatures
of inter-cluster interaction. The energy landscape picture of this glassy phase
is described in terms of hierarchical model. Further, it is shown that this
inhomogeneity disappear in La${_{0.9}}$Sr$_{0.1}$MnO$_{3.08}$ where, the
orbital domain state is destroyed by self doping resulting in reduction of
Mn$^{3+}$ and hence e$_g$-electrons. The ferromagnetic phase of the
non-stoichiometric sample, does not show glassy behaviour. It neither follows
'hierarchical model' nor 'droplet model' generally used to explain glassy or
inhomogeneous systems. Its magnetic response can be explained simply from the
domain wall dynamics of otherwise homogeneous ferromagnet.
|
cond-mat.str-el cond-mat.mtrl-sci
|
an attempt is made to resolve the controversy related to the low temperature phase ground state of the lowdoped ferromagnetic fm insulatori manganite through bulk magnetic measurements on la_09sr_01mno_3 sample it is shown that the fm phase formed out of well defined transition in the lowdoped system becomes inhomogeneous with decrease in temperature this inhomogeniety is considered to be an outcome of the formation of orbital domain state of e_gelectrons having hole rich metallic walls separating the hole deficient insulating regions the resulting complexity brings in metastability and glassy behaviour within the fm phase at low temperature however with no resemblance to spin glass cluster glass or reentrant phases it shows ageing effect without memory but magnetic relaxation shows signatures of intercluster interaction the energy landscape picture of this glassy phase is described in terms of hierarchical model further it is shown that this inhomogeneity disappear in la_09sr_01mno_308 where the orbital domain state is destroyed by self doping resulting in reduction of mn3 and hence e_gelectrons the ferromagnetic phase of the nonstoichiometric sample does not show glassy behaviour it neither follows hierarchical model nor droplet model generally used to explain glassy or inhomogeneous systems its magnetic response can be explained simply from the domain wall dynamics of otherwise homogeneous ferromagnet
|
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|
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|
707.1556
|
How Magnetic is the Neutrino?
|
The existence of a neutrino magnetic moment implies contributions to the
neutrino mass via radiative corrections. We derive model-independent
"naturalness" upper bounds on the magnetic moments of Dirac and Majorana
neutrinos, generated by physics above the electroweak scale. For Dirac
neutrinos, the bound is several orders of magnitude more stringent than present
experimental limits. However, for Majorana neutrinos the magnetic moment bounds
are weaker than present experimental limits if $\mu_\nu$ is generated by new
physics at ~ 1 TeV, and surpass current experimental sensitivity only for new
physics scales > 10 -- 100 TeV. The discovery of a neutrino magnetic moment
near present limits would thus signify that neutrinos are Majorana particles.
|
hep-ph
|
the existence of a neutrino magnetic moment implies contributions to the neutrino mass via radiative corrections we derive modelindependent naturalness upper bounds on the magnetic moments of dirac and majorana neutrinos generated by physics above the electroweak scale for dirac neutrinos the bound is several orders of magnitude more stringent than present experimental limits however for majorana neutrinos the magnetic moment bounds are weaker than present experimental limits if mu_nu is generated by new physics at 1 tev and surpass current experimental sensitivity only for new physics scales 10 100 tev the discovery of a neutrino magnetic moment near present limits would thus signify that neutrinos are majorana particles
|
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|
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|
707.1557
|
Abiotic formation of O2 and O3 in high-CO2 terrestrial atmospheres
|
Previous research has indicated that high amounts of ozone (O3) and oxygen
(O2) may be produced abiotically in atmospheres with high concentrations of
CO2. The abiotic production of these two gases, which are also characteristic
of photosynthetic life processes, could pose a potential "false-positive" for
remote-sensing detection of life on planets around other stars.We show here
that such false positives are unlikely on any planet that possesses abundant
liquid water, as rainout of oxidized species onto a reduced planetary surface
should ensure that atmospheric H2 concentrations remain relatively high, and
that O2 and O3 remain low. Our aim is to determine the amount of O3 and O2
formed in a high CO2 atmosphere for a habitable planet without life. We use a
photochemical model that considers hydrogen (H2) escape and a detailed hydrogen
balance to calculate the O2 and O3 formed on planets with 0.2 of CO2 around the
Sun, and 0.02, 0.2 and 2 bars of CO2 around a young Sun-like star with higher
UV radiation. The concentrations obtained by the photochemical model were used
as input in a radiative transfer model that calculated the spectra of the
modeled planets. The O3 and O2 concentrations in the simulated planets are
extremely small, and unlikely to produce a detectable signature in the spectra
of those planets. We conclude that with a balanced hydrogen budget, and for
planets with an active hydrological cycle, abiotic formation of O2 and O3 is
unlikely to create a possible false positive for life detection in either the
visible/near-infrared or mid-infrared wavelength regimes.
|
astro-ph
|
previous research has indicated that high amounts of ozone o3 and oxygen o2 may be produced abiotically in atmospheres with high concentrations of co2 the abiotic production of these two gases which are also characteristic of photosynthetic life processes could pose a potential falsepositive for remotesensing detection of life on planets around other starswe show here that such false positives are unlikely on any planet that possesses abundant liquid water as rainout of oxidized species onto a reduced planetary surface should ensure that atmospheric h2 concentrations remain relatively high and that o2 and o3 remain low our aim is to determine the amount of o3 and o2 formed in a high co2 atmosphere for a habitable planet without life we use a photochemical model that considers hydrogen h2 escape and a detailed hydrogen balance to calculate the o2 and o3 formed on planets with 02 of co2 around the sun and 002 02 and 2 bars of co2 around a young sunlike star with higher uv radiation the concentrations obtained by the photochemical model were used as input in a radiative transfer model that calculated the spectra of the modeled planets the o3 and o2 concentrations in the simulated planets are extremely small and unlikely to produce a detectable signature in the spectra of those planets we conclude that with a balanced hydrogen budget and for planets with an active hydrological cycle abiotic formation of o2 and o3 is unlikely to create a possible false positive for life detection in either the visiblenearinfrared or midinfrared wavelength regimes
|
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|
[-0.055626725125695484, 0.20932223896296914, 0.04640323783610522, 0.08281813572969013, 0.029866554912955208, -0.09497480491150881, 0.09211489368512762, 0.38216203048912234, -0.1688184355972661, -0.34116273939406594, 0.11795595271969468, -0.2858597468113679, -0.09582740970677062, 0.16281664246106195, -0.0670565575296023, -0.005406111586161306, 0.08568608493531478, -0.04859466166398579, 0.005365443010751071, -0.2525100276337987, 0.22565524680503726, 0.09175557001214837, 0.1061730723853444, 0.05530128661535883, 0.02681807702468846, -0.12028897017175295, 0.0043485348906951455, -0.077837851047081, -0.13470429534401476, 0.09143583972735425, 0.2690536052945291, 0.1150039540538528, 0.17833509534626388, -0.45250775382748953, -0.3004726393923801, 0.09904810134865025, 0.10863712485716588, 0.0915003928164716, -0.0997699899213925, -0.20701920175888658, 0.059092225554011446, -0.16445412054152414, -0.1521563948719157, -0.007429324992812793, 0.05595280778148585, -0.015807548874979187, -0.2928552504353486, 0.07050731410224857, 0.0261567671874317, 0.13949410185663588, -0.16849757895754208, -0.15855278898617578, -0.18540335407458855, 0.0866726302407711, 0.029819746741369106, 0.012640717961636991, 0.2431866780072016, -0.11535964125825332, -0.009398736057853768, 0.45068397995533876, -0.16742490408380412, -0.08657992804415728, 0.30494187097155745, -0.20816982327869837, -0.16051853965906288, 0.23676930973578084, 0.1514625845296983, 0.12602730110606564, -0.13346493238735407, -0.009639836146459092, 0.003483623925869168, 0.19253243211881485, 0.10189576702851962, 0.01038208676697795, 0.3531602666593711, 0.14553797949859257, 0.0615238284471115, 0.07162516236695704, -0.19004741887351795, -0.030326149645868456, -0.16344430835388513, -0.2106322170251524, -0.12209256729545934, 0.07448717080102135, -0.05629812095768148, -0.1396119967048647, 0.3084613837696728, 0.12901933962757361, 0.15639683642834135, -0.0011844382859614283, 0.25757649597795207, 0.07686192912442777, 0.06679224417452494, 0.03357860827383654, 0.26330908892154403, 0.0956214995987841, 0.061666495998386396, -0.26896331383908306, 0.1349355379909509, -0.017136281452246792]
|
707.1558
|
Autonomy with regard to an Attribute
|
This paper presents a model of autonomy called autonomy with regard to an
attribute applicable to cognitive and not cognitive artificial agents. Three
criteria (global / partial, social / nonsocial, absolute / relative) are
defined and used to describe the main characteristics of this type of autonomy.
A software agent autonomous with regard to the mobility illustrates a possible
implementation of this model.
|
cs.MA
|
this paper presents a model of autonomy called autonomy with regard to an attribute applicable to cognitive and not cognitive artificial agents three criteria global partial social nonsocial absolute relative are defined and used to describe the main characteristics of this type of autonomy a software agent autonomous with regard to the mobility illustrates a possible implementation of this model
|
[['this', 'paper', 'presents', 'a', 'model', 'of', 'autonomy', 'called', 'autonomy', 'with', 'regard', 'to', 'an', 'attribute', 'applicable', 'to', 'cognitive', 'and', 'not', 'cognitive', 'artificial', 'agents', 'three', 'criteria', 'global', 'partial', 'social', 'nonsocial', 'absolute', 'relative', 'are', 'defined', 'and', 'used', 'to', 'describe', 'the', 'main', 'characteristics', 'of', 'this', 'type', 'of', 'autonomy', 'a', 'software', 'agent', 'autonomous', 'with', 'regard', 'to', 'the', 'mobility', 'illustrates', 'a', 'possible', 'implementation', 'of', 'this', 'model']]
|
[-0.14900858181839188, 0.0019568777393336252, -0.04079803343241414, 0.03944142845963749, -0.13108455231801297, -0.19117643611971288, 0.027883183368248864, 0.41397391830881436, -0.2711442389835914, -0.33442151077712573, 0.027503068818865963, -0.20344287269593528, -0.23718228011081616, 0.1319941831054166, -0.20515304389409722, 0.024958917397695284, 0.02738871534044544, 0.0962575895867, 0.03790091245027725, -0.22490794459978738, 0.3423254598242541, 0.0667126623292764, 0.28834424205124376, 0.03148870901204646, 0.12965617338971544, -0.014729110896587372, -0.04924419839323188, 0.016849333560094236, -0.09248670080366234, 0.21761306904954836, 0.33986379131674765, 0.1920591030580302, 0.36553552287320296, -0.3829781608035167, -0.19514732849784194, 0.11186871304331968, 0.12129883728145312, 0.04329621269134805, 0.02650946822638313, -0.3268306481807182, 0.06708465421882769, -0.24339200927255053, -0.18181586816596487, -0.04986024362345536, -0.025781310827005653, 0.022603508345976783, -0.24770091173704714, -0.04573693044173221, 0.06604940561871141, 0.14563004044272626, -0.12305249446847787, -0.07668050586556395, 0.01462528700940311, 0.1738683360706394, 0.023403715710931767, -0.016298130480572583, 0.13863241559981057, -0.1431666446888509, -0.19216773099421214, 0.40815042002747454, 0.03924884021592637, -0.20568636175206242, 0.2619755895808339, -0.01905645413789898, -0.1555265101371333, 0.06549633517861367, 0.21939713746930162, 0.028593190394652388, -0.22582499926599364, 0.011310019637069976, 0.0324478208902292, 0.18904696957518657, -0.03291782427501554, 0.017725215417643388, 0.13971679744621118, 0.23041951935738325, 0.10838713264092803, 0.08601419921033085, -0.005810179996963901, -0.09945088524157958, -0.25427816356532273, -0.18940882256720215, -0.11394261044527715, 0.04340291310824493, -0.033251744561130184, -0.1414189654402435, 0.4178993542989095, 0.24422842375934123, 0.1629780509509146, 0.07857366236081968, 0.31380541883409024, 0.07066591151524335, 0.04234167061652746, 0.03734783021112283, 0.17692731665447353, 0.05501143783718968, 0.16122580709246298, -0.21096069536870346, 0.14632487714989112, 0.001589124898115794]
|
707.1559
|
An accurate finite element method for elliptic interface problems
|
A finite element method for elliptic problems with discontinuous coefficients
is presented. The discontinuity is assumed to take place along a closed smooth
curve. The proposed method allows to deal with meshes that are not adapted to
the discontinuity line. The (nonconforming) finite element space is enriched
with local basis functions. We prove an optimal convergence rate in the
$H^1$--norm. Numerical tests confirm the theoretical results.
|
math.NA
|
a finite element method for elliptic problems with discontinuous coefficients is presented the discontinuity is assumed to take place along a closed smooth curve the proposed method allows to deal with meshes that are not adapted to the discontinuity line the nonconforming finite element space is enriched with local basis functions we prove an optimal convergence rate in the h1norm numerical tests confirm the theoretical results
|
[['a', 'finite', 'element', 'method', 'for', 'elliptic', 'problems', 'with', 'discontinuous', 'coefficients', 'is', 'presented', 'the', 'discontinuity', 'is', 'assumed', 'to', 'take', 'place', 'along', 'a', 'closed', 'smooth', 'curve', 'the', 'proposed', 'method', 'allows', 'to', 'deal', 'with', 'meshes', 'that', 'are', 'not', 'adapted', 'to', 'the', 'discontinuity', 'line', 'the', 'nonconforming', 'finite', 'element', 'space', 'is', 'enriched', 'with', 'local', 'basis', 'functions', 'we', 'prove', 'an', 'optimal', 'convergence', 'rate', 'in', 'the', 'h1norm', 'numerical', 'tests', 'confirm', 'the', 'theoretical', 'results']]
|
[-0.11495168147269975, 0.012166905162413252, -0.14302589258912837, 0.03142801612777861, -0.11763778673202703, -0.13231578930704432, 0.011539831602325043, 0.4167722278472149, -0.29138908958570525, -0.15655434542250904, 0.11118340074388085, -0.2524867509352837, -0.06918956874869764, 0.22637109771709552, -0.11363175607314616, 0.10760060467785507, 0.0933054556265812, 0.0031547672503317394, -0.13476460648234934, -0.2767447442888762, 0.3062740117029259, -0.01683225440369411, 0.29211756062101235, 0.07654418951521318, 0.11941887606217554, -0.08718084280774223, -0.04425523150006704, 0.06045127374245291, -0.12680198484028524, 0.10048836369462537, 0.3130876562755668, 0.023397597099767263, 0.2918501317811509, -0.42260993472441577, -0.24500122830045945, 0.11588349547519376, 0.11720246346808519, 0.07977054601140095, -0.08307160449101392, -0.2328897004199186, 0.14639634433004892, -0.11584577030699814, -0.2222053354436701, -0.067352046212887, -0.036323478784073486, 0.0686957643395572, -0.3679988404072708, 0.04218379028536605, 0.02317029240569382, 0.07509799795507481, -0.06592782854303633, -0.10058638645392476, 0.0018298466703995612, 0.06828015516370986, 0.01963166203561493, 0.03942723007816257, 0.05088845861257252, 0.022215649415033335, -0.05766516612052466, 0.38905374286696315, -0.07890366169952111, -0.3163453306981616, 0.15082513474661743, -0.15373234787275028, -0.08641289798966185, 0.20099338664757935, 0.1672037273617179, 0.17440117119501033, -0.0716106779097269, 0.1233740926854256, -0.02912508888226567, 0.17176765347407622, -0.0014944186920977452, -0.08801991510854075, 0.07201845938283385, 0.09965271990972036, 0.13399922260026814, 0.11069012221979034, -0.04806632349606265, -0.12770491330461067, -0.3882204833807367, -0.16370047425681894, -0.15948269341253873, -0.07783040469384463, -0.15180568215719453, -0.24174061084561277, 0.3274846656713635, 0.10380449304074953, 0.1637469350049893, 0.0707334891229755, 0.27840053005087556, 0.17692600369848538, 0.023654322055253117, 0.08546156463721259, 0.1886782052284671, 0.16522418074027606, 0.0529592466455969, -0.2287823738720776, 0.09415765196988077, 0.21952876963680892]
|
707.156
|
The Analysis of Penumbral Fine Structure Using an Advanced Inversion
Technique
|
We present a method to study the penumbral fine structure using data obtained
by the spectropolarimeter onboard HINODE. For the first time, the penumbral
filaments can be considered as resolved in spectropolarimetric measurements.
This enables us to use inversion codes with only one-component model
atmospheres, and thus assign the obtained stratifications of plasma parameters
directly to the penumbral fine structure. This approach is applied to the
limb-side part of the penumbra in active region NOAA 10923. The preliminary
results show a clear dependence of the plasma parameters on continuum intensity
in the inner penumbra, i.e. weaker and horizontal magnetic field along with
increased line-of-sight velocity are found in the low layers of the bright
filaments. The results in the mid penumbra are ambiguous and future analyses
are necessary to unveil the magnetic field structure and other plasma
parameters there.
|
astro-ph
|
we present a method to study the penumbral fine structure using data obtained by the spectropolarimeter onboard hinode for the first time the penumbral filaments can be considered as resolved in spectropolarimetric measurements this enables us to use inversion codes with only onecomponent model atmospheres and thus assign the obtained stratifications of plasma parameters directly to the penumbral fine structure this approach is applied to the limbside part of the penumbra in active region noaa 10923 the preliminary results show a clear dependence of the plasma parameters on continuum intensity in the inner penumbra ie weaker and horizontal magnetic field along with increased lineofsight velocity are found in the low layers of the bright filaments the results in the mid penumbra are ambiguous and future analyses are necessary to unveil the magnetic field structure and other plasma parameters there
|
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|
[-0.11269207202775819, 0.14045726495506844, -0.04820975582215854, 0.08211358638543957, -0.10783773098683667, -0.07378416862874794, -0.004182424928939385, 0.4652099668336429, -0.23593699950335392, -0.3532025141795601, 0.08158504024479646, -0.21427010730069748, -0.09843952708254508, 0.18017649549108147, -0.013114218024927252, 0.007643683714684929, 0.09086836308321293, -0.029262837448003266, -0.012291368606279222, -0.17063498073056502, 0.28607977696664283, 0.11801463979289686, 0.2378962381186781, 0.014051174766739173, 0.025130681868595666, -0.10392184501259233, -0.06804780934086378, 0.04775951589330388, -0.15256020770709303, 0.07621916787357157, 0.2000250649762427, 0.05905388373037358, 0.20083472191225468, -0.48638437154347736, -0.23347618513934904, -0.010130050183414556, 0.17399578718066538, 0.02642150271496327, -0.0058800796149030546, -0.30445209790101585, 0.07481339404136679, -0.05347846757466469, -0.1348543643654934, -0.016533363024241847, -0.015298143476448792, 0.006535141200343107, -0.279687347509915, 0.05804336871013796, -0.021322499592152003, 0.13154655890271283, -0.1216983381169262, -0.07955657135655018, -0.07447780408769203, 0.14873118584694192, 0.0801846214692383, 0.04332580709689223, 0.15820824505598788, -0.135080510793964, -0.04127500882445962, 0.33270205642438405, -0.08542580939929852, -0.07314055990226728, 0.1433727490856386, -0.2268857729433627, -0.1430145842358202, 0.1742760499255906, 0.13410452179101517, 0.09856447353691077, -0.07336252676984698, 0.024170187382545096, -0.10356813495670505, 0.17006021940397273, 0.047503367753150005, 0.0011337502531224876, 0.23925391819642977, 0.1042714313865244, 0.04799814748061861, 0.1436720778993934, -0.24758926534182693, -0.05646260896288931, -0.27638953025687296, -0.13411629739344763, -0.0873591827711077, -0.038454420368770045, -0.07308877761670046, -0.17611990157990523, 0.4119991430570539, 0.1803483920634168, 0.23862996335784575, -0.035269264691248, 0.33509390527824706, 0.06555694366282643, 0.10317217427634186, 0.12408197082565736, 0.29457089995710756, 0.21317808696055424, 0.19708627522688546, -0.21932024124460361, 0.05006210299262361, 0.045474913346467256]
|
707.1561
|
The Reionization and Galaxy Evolution Probed by z=7 Lyman Alpha Emitters
|
We made a narrowband NB973 (bandwidth of 200A at 9755A) imaging of the Subaru
Deep Field (SDF) and found two z=7 Lyman alpha emitter (LAE) candidates down to
NB973=24.9. Carrying out deep follow-up spectroscopy, we identified one of them
as a real z=6.96 LAE. This has shown that galaxy formation was in progress just
750 Myr after the Big Bang. Meanwhile, the Lyman alpha line luminosity function
of LAE is known to decline from z=5.7 to 6.6 in the SDF. L* at z=6.6 is 40-60%
of that at z=5.7. We also confirm that the number density of z=7 LAE is only
17% of the density at z=6.6 comparing the latest SDF LAE samples. This series
of significant decreases in LAE density with increasing redshift can be the
result of galaxy evolution during these epochs. However, using the UV continuum
luminosity functions of LAEs, those of Lyman break galaxies, and a LAE
evolution model based on the hierarchical clustering, we find that galaxy
evolution alone cannot explain all the decrease in density. This extra density
deficit can be interpreted as the attenuation of the Lyman alpha photons from
LAEs due to a rapid evolution of neutral hydrogen fraction during the ongoing
cosmic reionization at z~6.6-7.
|
astro-ph
|
we made a narrowband nb973 bandwidth of 200a at 9755a imaging of the subaru deep field sdf and found two z7 lyman alpha emitter lae candidates down to nb973249 carrying out deep followup spectroscopy we identified one of them as a real z696 lae this has shown that galaxy formation was in progress just 750 myr after the big bang meanwhile the lyman alpha line luminosity function of lae is known to decline from z57 to 66 in the sdf l at z66 is 4060 of that at z57 we also confirm that the number density of z7 lae is only 17 of the density at z66 comparing the latest sdf lae samples this series of significant decreases in lae density with increasing redshift can be the result of galaxy evolution during these epochs however using the uv continuum luminosity functions of laes those of lyman break galaxies and a lae evolution model based on the hierarchical clustering we find that galaxy evolution alone cannot explain all the decrease in density this extra density deficit can be interpreted as the attenuation of the lyman alpha photons from laes due to a rapid evolution of neutral hydrogen fraction during the ongoing cosmic reionization at z667
|
[['we', 'made', 'a', 'narrowband', 'nb973', 'bandwidth', 'of', '200a', 'at', '9755a', 'imaging', 'of', 'the', 'subaru', 'deep', 'field', 'sdf', 'and', 'found', 'two', 'z7', 'lyman', 'alpha', 'emitter', 'lae', 'candidates', 'down', 'to', 'nb973249', 'carrying', 'out', 'deep', 'followup', 'spectroscopy', 'we', 'identified', 'one', 'of', 'them', 'as', 'a', 'real', 'z696', 'lae', 'this', 'has', 'shown', 'that', 'galaxy', 'formation', 'was', 'in', 'progress', 'just', '750', 'myr', 'after', 'the', 'big', 'bang', 'meanwhile', 'the', 'lyman', 'alpha', 'line', 'luminosity', 'function', 'of', 'lae', 'is', 'known', 'to', 'decline', 'from', 'z57', 'to', '66', 'in', 'the', 'sdf', 'l', 'at', 'z66', 'is', '4060', 'of', 'that', 'at', 'z57', 'we', 'also', 'confirm', 'that', 'the', 'number', 'density', 'of', 'z7', 'lae', 'is', 'only', '17', 'of', 'the', 'density', 'at', 'z66', 'comparing', 'the', 'latest', 'sdf', 'lae', 'samples', 'this', 'series', 'of', 'significant', 'decreases', 'in', 'lae', 'density', 'with', 'increasing', 'redshift', 'can', 'be', 'the', 'result', 'of', 'galaxy', 'evolution', 'during', 'these', 'epochs', 'however', 'using', 'the', 'uv', 'continuum', 'luminosity', 'functions', 'of', 'laes', 'those', 'of', 'lyman', 'break', 'galaxies', 'and', 'a', 'lae', 'evolution', 'model', 'based', 'on', 'the', 'hierarchical', 'clustering', 'we', 'find', 'that', 'galaxy', 'evolution', 'alone', 'can', 'not', 'explain', 'all', 'the', 'decrease', 'in', 'density', 'this', 'extra', 'density', 'deficit', 'can', 'be', 'interpreted', 'as', 'the', 'attenuation', 'of', 'the', 'lyman', 'alpha', 'photons', 'from', 'laes', 'due', 'to', 'a', 'rapid', 'evolution', 'of', 'neutral', 'hydrogen', 'fraction', 'during', 'the', 'ongoing', 'cosmic', 'reionization', 'at', 'z667']]
|
[-0.022535393156899636, 0.09901056917946749, -0.06518383761913986, 0.08813425186459012, -0.07596395232733155, -0.08493730828331986, 0.05363077974398759, 0.4609857884899593, -0.10229279927097924, -0.35327468498029035, -0.0034575480176049452, -0.32229571486131686, -0.03772441838582111, 0.15417077223249334, 0.05168930439325741, 0.014169197116337606, -0.0028564366327580248, -0.1301641729222334, 0.006595392513857108, -0.3763920666735232, 0.26684359926730394, 0.09955700523753669, 0.19153090621261756, -0.024087362764818168, 0.09264362389383156, -0.07286527747804723, -0.10646498674010434, -0.01435396395160328, -0.16452781312322673, -0.018151521757660008, 0.25395407296352934, 0.1572916056559707, 0.3099446606518018, -0.318129448340007, -0.2077888089784255, 0.10146292353032783, 0.24307730386384052, 0.07469357465310852, -0.04064814801072001, -0.2905011398828413, 0.06324740598960273, -0.14215506658545582, -0.15457448621031525, 0.13122511229081318, 0.028712504320330734, 0.03519595720480187, -0.1956842174680931, 0.15508755547150688, -0.05219192237427255, 0.05731947127542929, -0.05548025930466333, -0.07049929123777564, -0.09847713895095973, 0.018140199605725927, -0.008033230540568544, 0.11168332551237159, 0.19719137686147992, -0.21821899520980176, -0.029119435100733202, 0.32913121587532285, -0.11548366618750727, 0.06967264519385431, 0.18819637966600458, -0.22012070872899292, -0.2372392618125028, 0.20806840224892342, 0.1304131014598764, 0.05066472832067399, -0.12082342442936532, 0.05629336392785893, -0.004592453554332588, 0.2909787738935487, 0.036951372653504115, 0.06346787616290961, 0.29881601794484525, 0.08812219944107116, 0.0285263449520721, 0.07726598300885797, -0.21241796376500025, 0.03798658157454453, -0.27846488846456724, -0.12721169801511903, -0.15703131175095142, 0.17189613564205322, -0.13249620641014045, -0.11322006286109802, 0.33811556302140106, 0.14405932386940584, 0.25394768495629033, 0.13069118896849674, 0.2667925794456744, 0.1717366158742098, 0.1407433162872117, 0.029116806218004092, 0.3162497539916952, 0.1266189998737306, 0.08233898643134531, -0.21764075074956918, 0.05123961263446893, -0.010262389085255563]
|
707.1562
|
Percolation cluster formation at ultrarelativistic heavy ion collisions
|
We expect that the experimental study of percolation cluster formation and
appearance of the critical transparency of the strongly interacting matter can
give the information about the onset state of deconfinement.
|
nucl-ex
|
we expect that the experimental study of percolation cluster formation and appearance of the critical transparency of the strongly interacting matter can give the information about the onset state of deconfinement
|
[['we', 'expect', 'that', 'the', 'experimental', 'study', 'of', 'percolation', 'cluster', 'formation', 'and', 'appearance', 'of', 'the', 'critical', 'transparency', 'of', 'the', 'strongly', 'interacting', 'matter', 'can', 'give', 'the', 'information', 'about', 'the', 'onset', 'state', 'of', 'deconfinement']]
|
[-0.1525915215512918, 0.222666296567167, -0.13851846389076355, 0.07998556998227874, -0.04928834724330133, -0.0553434825231952, 0.07000520897488441, 0.3212222447318415, -0.20116352304936416, -0.308532833211845, 0.09320226622625224, -0.28857978637660703, -0.1355229763824853, 0.0729640866479566, 0.05912988428627291, -0.008360890130842886, 0.036974481367055445, 0.15615353450900124, -0.0645321047218937, -0.24757788985246612, 0.38625313341617584, 0.025935211173829534, 0.2770880990691723, 0.1910445138571724, 0.00022327046721212326, 0.01102357389285199, 0.035672225688974706, -0.008926141241024579, -0.21127679163797555, 0.07688166285234113, 0.1979131000416894, 0.10617874310053359, 0.19481668765506438, -0.3896021524504308, -0.2509968659780439, 0.12514707497170857, 0.17423462298428338, 0.12904707533157161, -0.0679544661571497, -0.3398551316631417, 0.04740592584975304, -0.1358652485143994, -0.15363889136501857, -0.04779181004531922, -0.031840290663944136, 0.039103152042615316, -0.21184732855087327, 0.14701356768848434, 0.06868383778829969, -0.00461164888955893, -0.08056640976499166, -0.04809464060611302, -0.03686478421572716, 0.11801245132641446, -0.03349596234939752, 0.024909313997223733, 0.2205733999519819, -0.25185241586258333, -0.13038731462532474, 0.39286847664944585, -0.010870159325760699, 0.03046564343235185, 0.23370830519425292, -0.22932381708655628, -0.12187958316456887, 0.1338119707520931, 0.15315148138230847, 0.04612472767551099, -0.09441688876118391, -0.041743333130368904, -0.04686495126976121, 0.18096467005389352, 0.008799047449663762, 0.06541364737636139, 0.28717957178671516, 0.2516717966796169, 0.06713497209092302, 0.18242741135820265, -0.08338505366156178, -0.14634390493794794, -0.3448648989921616, -0.12247998027070876, -0.12141392169700514, 0.05083393317557151, -0.13354734208147537, -0.1689426701876425, 0.3979759898877913, 0.2502699282110458, 0.2161634291161693, -0.023173747621777076, 0.18349386162815556, 0.08486546125383146, -0.019049770919786345, 0.029905882558875507, 0.27582726188965384, 0.16500206808409384, 0.1111628157837737, -0.3182390434367041, 0.07744314194086098, 0.03675632941116008]
|
707.1563
|
Rare Decay Modes of Quarter BPS Dyons
|
The degeneracy of quarter BPS dyons in N=4 supersymmetric string theories is
known to jump across walls of marginal stability on which a quarter BPS dyon
can decay into a pair of half BPS dyons. We show that as long as the electric
and magnetic charges of the original dyon are primitive elements of the charge
lattice, the subspaces of the moduli space on which a quarter BPS dyon becomes
marginally unstable against decay into a pair of quarter BPS dyons or a half
BPS dyon and a quarter BPS dyon are of codimension two or more. As a result any
pair of generic points in the moduli space can be connected by a path avoiding
these subspaces and there is no jump in the spectrum associated with these
subspaces.
|
hep-th
|
the degeneracy of quarter bps dyons in n4 supersymmetric string theories is known to jump across walls of marginal stability on which a quarter bps dyon can decay into a pair of half bps dyons we show that as long as the electric and magnetic charges of the original dyon are primitive elements of the charge lattice the subspaces of the moduli space on which a quarter bps dyon becomes marginally unstable against decay into a pair of quarter bps dyons or a half bps dyon and a quarter bps dyon are of codimension two or more as a result any pair of generic points in the moduli space can be connected by a path avoiding these subspaces and there is no jump in the spectrum associated with these subspaces
|
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|
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|
707.1564
|
Orbital-Driven Electronic Structure Changes and the Resulting Optical
Anisotropy of the Quasi-Two-Dimensional Spin Gap Compound La4Ru2O10
|
We investigated the electronic response of the quasi-two-dimensional spin gap
compound La4Ru2O10 using optical spectroscopy. We observed drastic changes in
the optical spectra as the temperature decreased, resulting in anisotropy in
the electronic structure of the spin-singlet ground state. Using the
orbital-dependent hopping analysis, we found that orbital ordering plays a
crucial role in forming the spin gap state in the non-one-dimensional material.
|
cond-mat.str-el
|
we investigated the electronic response of the quasitwodimensional spin gap compound la4ru2o10 using optical spectroscopy we observed drastic changes in the optical spectra as the temperature decreased resulting in anisotropy in the electronic structure of the spinsinglet ground state using the orbitaldependent hopping analysis we found that orbital ordering plays a crucial role in forming the spin gap state in the nononedimensional material
|
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|
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|
707.1565
|
Quantum state of an injected TROPO above threshold : purity, Glauber
function and photon number distribution
|
In this paper we investigate several properties of the full signal-idler-pump
mode quantum state generated by a triply resonant non-degenerate Optical
Parametric Oscillator operating above threshold, with an injected wave on the
signal and idler modes in order to lock the phase diffusion process. We
determine and discuss the spectral purity of this state, which turns out not to
be always equal to 1 even though the three interacting modes have been taken
into account at the quantum level. We have seen that the purity is essentially
dependent on the weak intensity of the injected light and on an asymmetry of
the synchronization. We then derive the expression of its total three-mode
Glauber P-function, and calculate the joint signal-idler photon number
probability distribution and investigate their dependence on the injection.
|
quant-ph
|
in this paper we investigate several properties of the full signalidlerpump mode quantum state generated by a triply resonant nondegenerate optical parametric oscillator operating above threshold with an injected wave on the signal and idler modes in order to lock the phase diffusion process we determine and discuss the spectral purity of this state which turns out not to be always equal to 1 even though the three interacting modes have been taken into account at the quantum level we have seen that the purity is essentially dependent on the weak intensity of the injected light and on an asymmetry of the synchronization we then derive the expression of its total threemode glauber pfunction and calculate the joint signalidler photon number probability distribution and investigate their dependence on the injection
|
[['in', 'this', 'paper', 'we', 'investigate', 'several', 'properties', 'of', 'the', 'full', 'signalidlerpump', 'mode', 'quantum', 'state', 'generated', 'by', 'a', 'triply', 'resonant', 'nondegenerate', 'optical', 'parametric', 'oscillator', 'operating', 'above', 'threshold', 'with', 'an', 'injected', 'wave', 'on', 'the', 'signal', 'and', 'idler', 'modes', 'in', 'order', 'to', 'lock', 'the', 'phase', 'diffusion', 'process', 'we', 'determine', 'and', 'discuss', 'the', 'spectral', 'purity', 'of', 'this', 'state', 'which', 'turns', 'out', 'not', 'to', 'be', 'always', 'equal', 'to', '1', 'even', 'though', 'the', 'three', 'interacting', 'modes', 'have', 'been', 'taken', 'into', 'account', 'at', 'the', 'quantum', 'level', 'we', 'have', 'seen', 'that', 'the', 'purity', 'is', 'essentially', 'dependent', 'on', 'the', 'weak', 'intensity', 'of', 'the', 'injected', 'light', 'and', 'on', 'an', 'asymmetry', 'of', 'the', 'synchronization', 'we', 'then', 'derive', 'the', 'expression', 'of', 'its', 'total', 'threemode', 'glauber', 'pfunction', 'and', 'calculate', 'the', 'joint', 'signalidler', 'photon', 'number', 'probability', 'distribution', 'and', 'investigate', 'their', 'dependence', 'on', 'the', 'injection']]
|
[-0.13383299645845048, 0.18110646793006038, -0.0890020694865217, 0.050372433050537534, 0.005288913521135963, -0.10581888139334529, 0.060819957339450316, 0.3814477178650771, -0.2506635854464717, -0.25797472610463235, 0.07242309247403471, -0.27344772553923286, -0.062200531294901475, 0.17614305278019216, 0.02732058384188617, 0.04964005401630547, 0.024643326817123695, 0.06351655192110081, -0.023063456415841285, -0.20756290700329943, 0.33092058055434925, 0.058136895663545345, 0.3204096129268783, 0.042008774261199686, 0.1274517509876931, 0.0391285705683363, -0.0001987923701950746, -0.04328009574276994, -0.13087330714019074, 0.0505499555982014, 0.17796899768155675, 0.08266068801514861, 0.2260884181704632, -0.4149121125192605, -0.1834896525508876, 0.13788358758875105, 0.1494914207881851, 0.12277197116325328, -0.0071125226699956514, -0.27968007761826236, 0.06419269169875702, -0.16978492506223825, -0.11107475793101038, -0.06108690888527059, -0.019382321932750156, 0.020910117977349332, -0.2396529516992123, 0.04535322902135753, 0.07698189818784017, 0.0272469647777404, -0.027764265336161262, -0.07895109204344394, -0.04992835087766654, 0.11085026081996183, 0.005509634962253085, -0.034760932794315455, 0.11844468342551831, -0.12974923413766679, -0.0898487606977452, 0.34817394787895084, -0.08619842127907675, -0.18706910079706085, 0.1452271014935014, -0.19375096518156487, -0.07899931501308384, 0.15446591455409983, 0.17942959404832057, 0.07705242006295873, -0.12600785820535565, 0.02936295769132255, 0.011278304444782096, 0.20842206092594667, 0.09491557678814198, 0.10503889785992891, 0.2070199245579772, 0.10046968042179076, 0.029725619136940603, 0.19000477146252615, -0.13822722209025493, -0.08310216049439917, -0.30433866566285317, -0.13603263130129942, -0.19153777200998487, 0.07552454506666147, -0.023391785103148176, -0.13569961792190177, 0.4553478072115848, 0.12631263594727876, 0.20156612538898638, 0.017684250112529123, 0.29148646802533157, 0.23294516101248505, 0.011141819807217103, 0.030686900867943383, 0.3082080658222007, 0.16447324896512858, 0.05686555513498453, -0.2872299184488465, 0.03537149117032676, -0.007435883947669766]
|
707.1566
|
K theory of smooth complete toric varieties and related spaces
|
The K-rings of non-singular complex pro jective varieties as well as quasi-
toric manifolds were described in terms of generators and relations in an
earlier work of the author with V. Uma. In this paper we obtain a similar
description for complete non-singular toric varieties. Indeed, our approach
enables us to obtain such a description for the more general class of torus
manifolds with locally standard torus action and orbit space a homology
polytope.
|
math.AT math.AG
|
the krings of nonsingular complex pro jective varieties as well as quasi toric manifolds were described in terms of generators and relations in an earlier work of the author with v uma in this paper we obtain a similar description for complete nonsingular toric varieties indeed our approach enables us to obtain such a description for the more general class of torus manifolds with locally standard torus action and orbit space a homology polytope
|
[['the', 'krings', 'of', 'nonsingular', 'complex', 'pro', 'jective', 'varieties', 'as', 'well', 'as', 'quasi', 'toric', 'manifolds', 'were', 'described', 'in', 'terms', 'of', 'generators', 'and', 'relations', 'in', 'an', 'earlier', 'work', 'of', 'the', 'author', 'with', 'v', 'uma', 'in', 'this', 'paper', 'we', 'obtain', 'a', 'similar', 'description', 'for', 'complete', 'nonsingular', 'toric', 'varieties', 'indeed', 'our', 'approach', 'enables', 'us', 'to', 'obtain', 'such', 'a', 'description', 'for', 'the', 'more', 'general', 'class', 'of', 'torus', 'manifolds', 'with', 'locally', 'standard', 'torus', 'action', 'and', 'orbit', 'space', 'a', 'homology', 'polytope']]
|
[-0.12992391085143723, 0.002762031443425046, -0.09004293053015454, 0.07494485193117177, -0.10267795436722163, -0.14215167290977623, -0.058340776824928206, 0.326561714484267, -0.24040189243164167, -0.2487788075096395, 0.08424463576464977, -0.22701036815263637, -0.1894291382321246, 0.22889701423732794, -0.18321549554980576, -0.002484943309467133, 0.0716170654313205, 0.04498246040399352, -0.13186945111095294, -0.31676276671151593, 0.42393777053803205, 0.027278934024937758, 0.20550667373973824, 0.013583102952433776, 0.10550335482439052, 0.042356787383403274, -0.012716634843294343, 0.020862335243106066, -0.15869231256720137, 0.14983472973108292, 0.31216231373789377, 0.0544817930674308, 0.10047590023238365, -0.37315475342361487, -0.18855004645373724, 0.14547491596679982, 0.1045479653403163, 0.08763421573102066, 0.009634003485513099, -0.26521052889627955, 0.0706478962674737, -0.22612756358025826, -0.21546266226684802, -0.13223157937906377, 0.056169932925027526, 0.016399789333649693, -0.2356722009278936, -0.01682427391562968, 0.13328102300077524, 0.13583948448848948, -0.0732968939685148, -0.05055498524907058, -0.045153523922885117, 0.08841699812790915, -0.02703185553649721, 0.09481910961259106, 0.0567518406139355, -0.06426843374087284, -0.15105806965993285, 0.405726905657004, -0.0831638380170685, -0.23122615424584445, 0.1702680589458969, -0.1361807662075105, -0.1599301217468328, 0.13098611416971337, 0.12091787102670498, 0.19520201100266144, -0.07080539429483756, 0.13499426299377987, -0.09893196596674723, 0.032922842568552046, 0.06525476049784928, 0.012679730246181612, 0.17255810234848767, 0.11880173766985536, 0.07551920172847705, 0.11658717811822075, 0.009975277129815866, -0.09772506946927473, -0.3292435836302091, -0.21463320164443694, -0.08455949955084043, 0.17942765996829696, -0.1011821341342835, -0.20715299465578713, 0.3990156267616541, 0.013173160666268165, 0.23680538493399955, 0.11130378268298706, 0.2219542938042177, 0.022000280124364956, 0.013724352883761877, 0.08244646280646732, 0.12843634427384767, 0.17892116957267568, 0.016667139269921877, -0.10297222922505071, -0.016997759779022164, 0.19838180475906558]
|
707.1567
|
Theory for ultrafast nonequilibrium dynamics in d-wave superconductors
|
We use density-matrix theory to calculate the ultrafast dynamics of
unconventional superconductors from a microscopic viewpoint. We calculate the
time evolution of the optical conductivity as well as pump-probe spectra for a
d-wave order parameter. Three regimes can be distinguished in the spectra. The
Drude response at low photon energies is the only one of those which has been
measured experimentally so far. At higher energies, we predict two more
regimes: the pair-breaking peak, which is reduced as Cooper-pairs are broken up
by the exciting pulse; and a suppression above the pair-breaking peak due to
nonequilibrium quasiparticles. Furthermore, we consider the influence of the
electron-phonon coupling, and derive rate equations which have been widely used
so far.
|
cond-mat.supr-con cond-mat.str-el
|
we use densitymatrix theory to calculate the ultrafast dynamics of unconventional superconductors from a microscopic viewpoint we calculate the time evolution of the optical conductivity as well as pumpprobe spectra for a dwave order parameter three regimes can be distinguished in the spectra the drude response at low photon energies is the only one of those which has been measured experimentally so far at higher energies we predict two more regimes the pairbreaking peak which is reduced as cooperpairs are broken up by the exciting pulse and a suppression above the pairbreaking peak due to nonequilibrium quasiparticles furthermore we consider the influence of the electronphonon coupling and derive rate equations which have been widely used so far
|
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|
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|
707.1568
|
Rapidly Rotating Bose-Einstein Condensates in Homogeneous Traps
|
We extend the results of a previous paper on the Gross-Pitaevskii description
of rotating Bose-Einstein condensates in two-dimensional traps to confining
potentials of the form V(r) = r^s, $2<s <\infty$. Writing the coupling constant
as $1/\epsilon^2$ we study the limit $\epsilon \to 0$. We derive rigorously the
leading asymptotics of the ground state energy and the density profile when the
rotation velocity \Omega tends to infinity as a power of $1/\epsilon$. The case
of asymptotically homogeneous potentials is also discussed.
|
math-ph cond-mat.other cond-mat.stat-mech math.MP
|
we extend the results of a previous paper on the grosspitaevskii description of rotating boseeinstein condensates in twodimensional traps to confining potentials of the form vr rs 2s infty writing the coupling constant as 1epsilon2 we study the limit epsilon to 0 we derive rigorously the leading asymptotics of the ground state energy and the density profile when the rotation velocity omega tends to infinity as a power of 1epsilon the case of asymptotically homogeneous potentials is also discussed
|
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|
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|
707.1569
|
Cell-to-Cell stochastic fluctuations in apoptotic signaling can decide
between life and death
|
Apoptosis, or genetically programmed cell death, is a crucial cellular
process that maintains the balance between life and death in cells. The precise
molecular mechanism of apoptosis signaling and how these two pathways are
differentially activated under distinct apoptotic stimuli is poorly understood.
We developed a Monte Carlo-based stochastic simulation model that can
characterize distinct signaling behaviors in the two major pathways of
apoptotic signaling using a novel probability distribution-based approach.
Specifically, we show that for a weak death signal, such as low levels of death
ligand Fas (CD95) binding or under stress conditions, the type 2 mitochondrial
pathway dominates apoptotic signaling. Our results also show signaling in the
type 2 pathway is stochastic, where the population average over many cells does
not capture the cell-to-cell fluctuations in the time course (~1 - 10 hours) of
downstream caspase-3 activation. On the contrary, the probability distribution
of caspase-3 activation for the mitochondrial pathway shows a distinct bimodal
behavior that can be used to characterize the stochastic signaling in type 2
apoptosis. Interestingly, such stochastic fluctuations in apoptosis signaling
happen even in the presence of large numbers of signaling molecules. In a
fluctuating environment, such stochasticity in the timecourse of caspase-3
activation may be an adaptive mechanism for allowing a competing survival
signal to win over a weak death trigger before the critical cell fate decision
is made and thus minimizes the risk of pathologies.
|
q-bio.MN physics.bio-ph physics.med-ph
|
apoptosis or genetically programmed cell death is a crucial cellular process that maintains the balance between life and death in cells the precise molecular mechanism of apoptosis signaling and how these two pathways are differentially activated under distinct apoptotic stimuli is poorly understood we developed a monte carlobased stochastic simulation model that can characterize distinct signaling behaviors in the two major pathways of apoptotic signaling using a novel probability distributionbased approach specifically we show that for a weak death signal such as low levels of death ligand fas cd95 binding or under stress conditions the type 2 mitochondrial pathway dominates apoptotic signaling our results also show signaling in the type 2 pathway is stochastic where the population average over many cells does not capture the celltocell fluctuations in the time course 1 10 hours of downstream caspase3 activation on the contrary the probability distribution of caspase3 activation for the mitochondrial pathway shows a distinct bimodal behavior that can be used to characterize the stochastic signaling in type 2 apoptosis interestingly such stochastic fluctuations in apoptosis signaling happen even in the presence of large numbers of signaling molecules in a fluctuating environment such stochasticity in the timecourse of caspase3 activation may be an adaptive mechanism for allowing a competing survival signal to win over a weak death trigger before the critical cell fate decision is made and thus minimizes the risk of pathologies
|
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|
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|
707.157
|
About the isotropy constant of random convex sets
|
Let K be the symmetric convex hull of m independent random vectors uniformly
distributed on the unit sphere of R^n. We prove that, for every $\delta>0$, the
isotropy constant of K is bounded by a constant $c(\delta)$ with high
probability, provided that $m\geq (1+\delta)n$.
|
math.MG math.FA
|
let k be the symmetric convex hull of m independent random vectors uniformly distributed on the unit sphere of rn we prove that for every delta0 the isotropy constant of k is bounded by a constant cdelta with high probability provided that mgeq 1deltan
|
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|
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|
707.1571
|
Observations on the motion of a Tachyon
|
Some aspects of the motion of a tachyon is discussed. It is shown that the
inertial frame Sigma-Prime around which the tachyon switches the direction of
its motion, does not observe any movement of the tachyon at all. Inertial
frames on either side of Sigma-Prime observe the tachyon to be moving at very
large speeds but in opposite direction. Sigma-Prime itself observes only a
sudden appearance and immediate disappearance of a long rod like object. Thus
unbounded speeds in either direction give the same result in the limit. This
suggests that negative numbers as a physical quantity are not meaningful.
Subtraction can be used integral to a formula but the final result has to be
interpreted with a positive answer. This means the abstract quantity -infinity
indicating an unbounded negative number is not meaningful. The situation is
also compared with Tan (Pi/2)+ and Tan(Pi/2)-. The conclusion is that in the
limit, travel at unbounded speed is direction independent and gives the
connotation of many identities to the same particle.
|
physics.gen-ph
|
some aspects of the motion of a tachyon is discussed it is shown that the inertial frame sigmaprime around which the tachyon switches the direction of its motion does not observe any movement of the tachyon at all inertial frames on either side of sigmaprime observe the tachyon to be moving at very large speeds but in opposite direction sigmaprime itself observes only a sudden appearance and immediate disappearance of a long rod like object thus unbounded speeds in either direction give the same result in the limit this suggests that negative numbers as a physical quantity are not meaningful subtraction can be used integral to a formula but the final result has to be interpreted with a positive answer this means the abstract quantity infinity indicating an unbounded negative number is not meaningful the situation is also compared with tan pi2 and tanpi2 the conclusion is that in the limit travel at unbounded speed is direction independent and gives the connotation of many identities to the same particle
|
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|
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|
707.1572
|
Switched Control of Electron Nuclear Spin Systems
|
In this article, we study control of electron-nuclear spin dynamics at
magnetic field strengths where the Larmor frequency of the nucleus is
comparable to the hyperfine coupling strength. The quantization axis for the
nuclear spin differs from the static B_0 field direction and depends on the
state of the electron spin. The quantization axis can be switched by flipping
the state of electron spin, allowing for universal control on nuclear spin
states. We show that by performing a sequence of flips (each followed by a
suitable delay), we can perform any desired rotation on the nuclear spins,
which can also be conditioned on the state of the electron spin. These
operations, combined with electron spin rotations can be used to synthesize any
unitary transformation on the coupled electron-nuclear spin system. We discuss
how these methods can be used for design of experiments for transfer of
polarization from the electron to the nuclear spins.
|
quant-ph
|
in this article we study control of electronnuclear spin dynamics at magnetic field strengths where the larmor frequency of the nucleus is comparable to the hyperfine coupling strength the quantization axis for the nuclear spin differs from the static b_0 field direction and depends on the state of the electron spin the quantization axis can be switched by flipping the state of electron spin allowing for universal control on nuclear spin states we show that by performing a sequence of flips each followed by a suitable delay we can perform any desired rotation on the nuclear spins which can also be conditioned on the state of the electron spin these operations combined with electron spin rotations can be used to synthesize any unitary transformation on the coupled electronnuclear spin system we discuss how these methods can be used for design of experiments for transfer of polarization from the electron to the nuclear spins
|
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|
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|
707.1573
|
X-ray measured metallicities of the intra-cluster medium: a good measure
for the metal mass?
|
Aims. We investigate whether X-ray observations map heavy elements in the
Intra-Cluster Medium (ICM) well and whether the X-ray observations yield good
estimates for the metal mass, with respect to predictions on transport mech-
anisms of heavy elements from galaxies into the ICM. We further test the
accuracy of simulated metallicity maps. Methods. We extract synthetic X-ray
spectra from N-body/hydrodynamic simulations including metal enrichment pro-
cesses, which we then analyse with the same methods as are applied to
observations. By changing the metal distribution in the simulated galaxy
clusters, we investigate the dependence of the overall metallicity as a
function of the metal distribution. In addition we investigate the difference
of X-ray weighted metal maps produced by simulations and metal maps extracted
from artifcial X-ray spectra, which we calculate with SPEX2.0 and analyse with
XSPEC12.0. Results. The overall metallicity depends strongly on the
distribution of metals within the galaxy cluster. The more inhomogeneously the
metals are distributed within the cluster, the less accurate is the metallicity
as a measure for the true metal mass. The true metal mass is generally
underestimated by X-ray observations. The difference between the X-ray weighted
metal maps and the metal maps from synthetic X-ray spectra is on average less
than 7% in the temperature regime above T > 3E7 K, i.e. X-ray weighted metal
maps can be well used for comparison with observed metal maps. Extracting the
metal mass in the central parts (r < 500 kpc) of galaxy clusters with X-ray
observations results in metal mass underestimates up to a factor of three.
|
astro-ph
|
aims we investigate whether xray observations map heavy elements in the intracluster medium icm well and whether the xray observations yield good estimates for the metal mass with respect to predictions on transport mech anisms of heavy elements from galaxies into the icm we further test the accuracy of simulated metallicity maps methods we extract synthetic xray spectra from nbodyhydrodynamic simulations including metal enrichment pro cesses which we then analyse with the same methods as are applied to observations by changing the metal distribution in the simulated galaxy clusters we investigate the dependence of the overall metallicity as a function of the metal distribution in addition we investigate the difference of xray weighted metal maps produced by simulations and metal maps extracted from artifcial xray spectra which we calculate with spex20 and analyse with xspec120 results the overall metallicity depends strongly on the distribution of metals within the galaxy cluster the more inhomogeneously the metals are distributed within the cluster the less accurate is the metallicity as a measure for the true metal mass the true metal mass is generally underestimated by xray observations the difference between the xray weighted metal maps and the metal maps from synthetic xray spectra is on average less than 7 in the temperature regime above t 3e7 k ie xray weighted metal maps can be well used for comparison with observed metal maps extracting the metal mass in the central parts r 500 kpc of galaxy clusters with xray observations results in metal mass underestimates up to a factor of three
|
[['aims', 'we', 'investigate', 'whether', 'xray', 'observations', 'map', 'heavy', 'elements', 'in', 'the', 'intracluster', 'medium', 'icm', 'well', 'and', 'whether', 'the', 'xray', 'observations', 'yield', 'good', 'estimates', 'for', 'the', 'metal', 'mass', 'with', 'respect', 'to', 'predictions', 'on', 'transport', 'mech', 'anisms', 'of', 'heavy', 'elements', 'from', 'galaxies', 'into', 'the', 'icm', 'we', 'further', 'test', 'the', 'accuracy', 'of', 'simulated', 'metallicity', 'maps', 'methods', 'we', 'extract', 'synthetic', 'xray', 'spectra', 'from', 'nbodyhydrodynamic', 'simulations', 'including', 'metal', 'enrichment', 'pro', 'cesses', 'which', 'we', 'then', 'analyse', 'with', 'the', 'same', 'methods', 'as', 'are', 'applied', 'to', 'observations', 'by', 'changing', 'the', 'metal', 'distribution', 'in', 'the', 'simulated', 'galaxy', 'clusters', 'we', 'investigate', 'the', 'dependence', 'of', 'the', 'overall', 'metallicity', 'as', 'a', 'function', 'of', 'the', 'metal', 'distribution', 'in', 'addition', 'we', 'investigate', 'the', 'difference', 'of', 'xray', 'weighted', 'metal', 'maps', 'produced', 'by', 'simulations', 'and', 'metal', 'maps', 'extracted', 'from', 'artifcial', 'xray', 'spectra', 'which', 'we', 'calculate', 'with', 'spex20', 'and', 'analyse', 'with', 'xspec120', 'results', 'the', 'overall', 'metallicity', 'depends', 'strongly', 'on', 'the', 'distribution', 'of', 'metals', 'within', 'the', 'galaxy', 'cluster', 'the', 'more', 'inhomogeneously', 'the', 'metals', 'are', 'distributed', 'within', 'the', 'cluster', 'the', 'less', 'accurate', 'is', 'the', 'metallicity', 'as', 'a', 'measure', 'for', 'the', 'true', 'metal', 'mass', 'the', 'true', 'metal', 'mass', 'is', 'generally', 'underestimated', 'by', 'xray', 'observations', 'the', 'difference', 'between', 'the', 'xray', 'weighted', 'metal', 'maps', 'and', 'the', 'metal', 'maps', 'from', 'synthetic', 'xray', 'spectra', 'is', 'on', 'average', 'less', 'than', '7', 'in', 'the', 'temperature', 'regime', 'above', 't', '3e7', 'k', 'ie', 'xray', 'weighted', 'metal', 'maps', 'can', 'be', 'well', 'used', 'for', 'comparison', 'with', 'observed', 'metal', 'maps', 'extracting', 'the', 'metal', 'mass', 'in', 'the', 'central', 'parts', 'r', '500', 'kpc', 'of', 'galaxy', 'clusters', 'with', 'xray', 'observations', 'results', 'in', 'metal', 'mass', 'underestimates', 'up', 'to', 'a', 'factor', 'of', 'three']]
|
[0.00144591986923022, 0.11580392398195816, -0.05397228609003565, 0.10926053586972914, -0.004769396268780909, -0.060750750969072766, 0.0792009245654495, 0.4558026343437971, -0.2093737605228728, -0.348069858422512, 0.035194137122244666, -0.377709262474787, -0.05019577494731137, 0.21667470493920002, 0.013411128519595984, -0.014144547610068876, 0.029271579915475028, -0.08289891354301397, -0.12578419361117424, -0.2261686302137141, 0.3245883667992209, 0.06798130694375026, 0.23442767751129234, 0.009266987925066668, 0.04740640924257391, -0.06011822896658023, -0.0791527868138955, 0.02525853518323571, -0.14702860013782687, 0.058972234619032664, 0.21302622549747136, 0.05591967072812658, 0.20029769464596814, -0.3701326745288337, -0.20891721393986076, 0.06628024654426411, 0.1510570835431709, 0.04946957671850481, -0.09269008537709905, -0.23674969202382307, 0.06989266872634271, -0.13726537710457457, -0.1398369077752874, 0.013847835697051065, -0.020193303160953757, 0.07833269052755307, -0.25365500982631656, 0.1297372257594914, -0.014800204341893322, 0.07230927019982654, -0.11401317567546286, -0.11270105981943654, -0.07206854570529186, 0.10130117189814793, -0.006891869613900781, 0.049438243335587724, 0.20220208395747286, -0.12770615393186316, -0.013058350189570703, 0.4223531029534106, -0.1127838666517146, -0.04710639153479361, 0.20278418212763819, -0.2265122748856597, -0.12037491371453393, 0.11410695223740357, 0.16900482098845876, 0.10752313444436547, -0.15174456216102722, 0.016713681562310633, -0.0552069367347833, 0.22002240122095043, 0.02584395967697834, 0.025027446300145147, 0.2613259934035002, 0.1414306671002551, 0.003507588772724072, 0.11476592654134056, -0.17680725328459898, -0.005396831176225461, -0.17972513555786482, -0.13106041923205267, -0.14918767570645786, 0.054166684511081115, -0.14557603191123253, -0.16288385015419302, 0.3454238200779347, 0.1304817072864549, 0.2424350500052028, 0.0257274350260987, 0.31114154061868643, 0.09970092665924526, 0.07265601401153368, 0.08431109130272971, 0.23963204895091408, 0.21146743337021154, 0.07470444795429049, -0.23822820528465158, 0.10411325868986109, 0.0314452739386801]
|
707.1574
|
Three loop anomalous dimensions of twist-3 gauge operators in N=4 SYM
|
We propose a closed expression for the three loop anomalous dimension of a
class of twist-3 operators built with gauge fields and covariant derivatives.
To this aim, we solve the long-range Bethe Ansatz equations at finite spin and
provide a consistent analytical formula obtained assuming maximal
transcendentality violation as suggested by the known one-loop anomalous
dimension. The final result reproduces the universal cusp anomalous dimension
and obeys recursion relations inspired by the principle of reciprocity
invariance.
|
hep-th
|
we propose a closed expression for the three loop anomalous dimension of a class of twist3 operators built with gauge fields and covariant derivatives to this aim we solve the longrange bethe ansatz equations at finite spin and provide a consistent analytical formula obtained assuming maximal transcendentality violation as suggested by the known oneloop anomalous dimension the final result reproduces the universal cusp anomalous dimension and obeys recursion relations inspired by the principle of reciprocity invariance
|
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|
[-0.18803713963318028, 0.15272312434880356, -0.08979308799423866, 0.16668114624151617, -0.13017064295892947, -0.15659528182157756, 0.036488329378986044, 0.23285971660363047, -0.20605478798480412, -0.24039479309201278, 0.020161347093036103, -0.24632988705937015, -0.18513493552975552, 0.1481675536396276, 0.027962838774424438, 0.08196771501465455, -0.03958795938064883, 0.060031205504951925, -0.12999256828946895, -0.21338117652033506, 0.3813523154730271, -0.02134874561115315, 0.30226567642469154, 0.08744078834149006, 0.20893072072220475, 0.02571818525412757, -0.05257198709755597, 0.013504529763993463, -0.14539915091652228, 0.14198273465521388, 0.19906145616091395, 0.03987674792235913, 0.08877559116502341, -0.40329981786443997, -0.1682713899982015, 0.06885319627288386, 0.1705264346429, 0.12384595324309837, 0.009839947041320173, -0.276759368208188, 0.027872980290435646, -0.22428433467192868, -0.29768274543886564, -0.14733659790975875, 0.004558078393242077, -0.11016645760728831, -0.2967773634683047, 0.13358844934938183, 0.06410489914675341, 0.07818544447716129, -0.050304000060637725, -0.13066251632929043, -0.00422090804817057, 0.07287315719325929, 0.07385856313569668, 0.01933196865904488, 0.06319166700919404, -0.12659665318757393, -0.19592100555861466, 0.3164487402138643, -0.10125106008184191, -0.20178427485945194, 0.09906171933643666, -0.20484935614819588, -0.17694683544533818, 0.09821522317973799, 0.08432211146971799, 0.08367617173414481, -0.22371193985944907, 0.17999128261841466, -0.05482487714432768, 0.07159288305985301, 0.1157623322705101, 0.031364895584135265, 0.13504183655114552, 0.05765740836872474, 0.019328658750868942, 0.15586343785674361, 0.004750146044802693, -0.0979541948886196, -0.40684548515434327, -0.13183752326049694, -0.16862964333574237, 0.114826725391475, -0.15249723130412013, -0.15419211044086537, 0.32952094842728813, 0.10731095727533102, 0.16181551446942122, 0.15805421517181553, 0.2636992575992879, 0.20951243792507357, 0.13861707231952, 0.09628428702585791, 0.18153164410767586, 0.22701294943812841, 0.06251929569713723, -0.2699152467294449, 0.029704885851395756, 0.24189227743466435]
|
707.1575
|
Entanglement of a class of mixed two - qutrit states
|
We compute the measure of entanglement for some classes of states belonging
to the simplex of Bell - diagonal states of two qutrits.
|
quant-ph
|
we compute the measure of entanglement for some classes of states belonging to the simplex of bell diagonal states of two qutrits
|
[['we', 'compute', 'the', 'measure', 'of', 'entanglement', 'for', 'some', 'classes', 'of', 'states', 'belonging', 'to', 'the', 'simplex', 'of', 'bell', 'diagonal', 'states', 'of', 'two', 'qutrits']]
|
[-0.15554616329344836, 0.19499761192128062, -0.02156852985816923, 0.06925489194691181, 0.09294155087660659, -0.22192308196628635, 0.06759342652830211, 0.28885419565168297, -0.2237023834059073, -0.20647862943058665, 0.04615440683185377, -0.3349933996796608, -0.028094462542371315, 0.15875264363024721, -0.009898454585874622, 0.13016119878739119, 0.0288509832568128, 0.06963117369873957, -0.12735988131978296, -0.28266840284182265, 0.4633841162378138, -0.12013048983433029, 0.259103262796998, 0.012713865292343226, 0.08238491390577772, -0.07758114533498883, 0.02606314399533651, -0.04213623025200584, -0.094639021479948, 0.1838935077433813, 0.23814690333198418, 0.23267088237811218, 0.20388898287307133, -0.3747037105600942, -0.07215508302165703, 0.1973147257231176, 0.0438467917794531, 0.14144985657185316, 0.06083078452237797, -0.3576831831173463, -0.020790220492265442, -0.18498632955280217, -0.1755824408239939, -0.13926481320099396, 0.05671743989329447, -0.04509705779227344, -0.24599810859019106, 0.05790655416521159, 0.07005242927169258, 0.018330069385807623, -0.0031027785417708483, -0.10661090944300998, -0.00823911110108549, 0.1482866890940138, -0.06723104978234253, -0.08436081943694841, 0.06580806534144688, -0.0916448946703564, -0.2394781205803156, 0.3007557370107282, -0.005264220251278443, -0.26024816202169115, 0.1903613248670643, -0.19443084553561427, -0.16073668108914385, 0.006197780836373568, 0.14873230897567488, 0.1191217044199055, -0.08312861397015778, 0.005858200178904967, -0.12813687265257945, 0.09182682091539557, 0.13777687163515526, 0.19927641503851523, 0.11318339661441067, -0.04486485215073282, 0.1395010711117224, 0.312328258656304, -0.10095909178595651, -0.15126468444412405, -0.3559679312800819, -0.314560452984138, -0.3074799005619504, 0.0715656832749532, -0.09981446554460986, -0.18564728410406547, 0.5381710582666777, 0.056169402192939415, 0.17565855278040876, 0.045224859421564775, 0.11878713711418888, 0.060912332412871445, 0.03201558623484082, 0.08827756366438487, 0.22228470756487118, 0.23224384904923764, -0.06437881604175676, -0.24911343067122454, 0.036309449848803604, 0.10994832776486874]
|
707.1576
|
Symbol calculus and zeta--function regularized determinants
|
In this work, we use semigroup integral to evaluate zeta-function regularized
determinants. This is especially powerful for non--positive operators such as
the Dirac operator. In order to understand fully the quantum effective action
one should know not only the potential term but also the leading kinetic term.
In this purpose we use the Weyl type of symbol calculus to evaluate the
determinant as a derivative expansion. The technique is applied both to a
spin--0 bosonic operator and to the Dirac operator coupled to a scalar field.
|
math-ph math.MP
|
in this work we use semigroup integral to evaluate zetafunction regularized determinants this is especially powerful for nonpositive operators such as the dirac operator in order to understand fully the quantum effective action one should know not only the potential term but also the leading kinetic term in this purpose we use the weyl type of symbol calculus to evaluate the determinant as a derivative expansion the technique is applied both to a spin0 bosonic operator and to the dirac operator coupled to a scalar field
|
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|
[-0.12883705878359547, 0.0806458598479282, -0.07236691413116966, 0.15650980903761635, -0.1717286334145641, -0.1490408787124812, -0.005593076600086724, 0.3138846053828507, -0.2823436666918962, -0.2204145562380206, 0.10253487537793685, -0.29884030288735103, -0.20864512771368027, 0.11867262390550486, -0.036053422984645464, 0.04484886499013492, 0.018022714605078448, 0.1412808835603903, -0.09911280738319768, -0.23151053013929793, 0.38189310924864783, 0.04856071544155955, 0.20378033189796085, 0.10177069472495553, 0.09648739234111163, -0.013609714621981217, 0.0036102525380894888, -0.04740751012726579, -0.06686349719259238, 0.10723516275716383, 0.2524757757999523, 0.013526751053367937, 0.2819962939085049, -0.41345996734534585, -0.2081509345254406, 0.13616188998918893, 0.1732874843061815, 0.07612309059626314, -0.0037121305480426136, -0.2607374069670778, 0.07044963705959882, -0.21686425433645762, -0.17897834524892672, -0.13610984838221135, -0.03187686552937944, -0.08601826718510237, -0.2952031831955537, 0.04149597898453236, 0.025583594306480398, 0.011664608401397979, -0.05330877334994892, -0.08538226645743084, 0.026353895317676457, 0.10339269673906613, 0.06828741521877778, 0.05833591854329719, 0.07035131450894094, -0.11689578171201499, -0.09259072754689124, 0.3612836406371275, -0.15585983072023102, -0.30009211274946845, 0.1309167490947212, -0.14931870029080485, -0.1135280129911248, 0.05133028409205127, 0.12734979871108176, 0.17306035309745713, -0.19745503931284644, 0.13911118820718446, 0.037417683024825746, 0.11613373586713055, 0.0353485907016452, 0.042542910696072286, 0.15027908038694499, 0.06334892083176, 0.0664981480926102, 0.1318126995073155, -0.03315763511196818, -0.1282857122322068, -0.33694274515606637, -0.24034954361660882, -0.20585821124151088, 0.08677989540389484, -0.05459994461023936, -0.2178417618148202, 0.4316329919668131, 0.19119635666179102, 0.13626447932383176, 0.03902281682158625, 0.27290754041872745, 0.2104853773679108, 0.13770433883507585, 0.02694421610253495, 0.1908246898200623, 0.18318803045292234, 0.14566441750976927, -0.23876679601515968, -0.043198591791266616, 0.18408303573554338]
|
707.1577
|
k-Ordered Hamilton cycles in digraphs
|
Given a digraph D, the minimum semi-degree of D is the minimum of its minimum
indegree and its minimum outdegree. D is k-ordered Hamiltonian if for every
ordered sequence of k distinct vertices there is a directed Hamilton cycle
which encounters these vertices in this order. Our main result is that every
digraph D of sufficiently large order n with minimum semi-degree at least
(n+k)/2 -1 is k-ordered Hamiltonian. The bound on the minimum semi-degree is
best possible. An undirected version of this result was proved earlier by
Kierstead, S\'ark\"ozy and Selkow.
|
math.CO
|
given a digraph d the minimum semidegree of d is the minimum of its minimum indegree and its minimum outdegree d is kordered hamiltonian if for every ordered sequence of k distinct vertices there is a directed hamilton cycle which encounters these vertices in this order our main result is that every digraph d of sufficiently large order n with minimum semidegree at least nk2 1 is kordered hamiltonian the bound on the minimum semidegree is best possible an undirected version of this result was proved earlier by kierstead sarkozy and selkow
|
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|
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|
707.1578
|
Entangled multi-qubit states without higher-tangle
|
We analyze mixed multi-qubit states composed of a W class state and a product
state with all qubit in |0>. We find the optimal pure state decomposition and
convex roofs for higher-tangle with bipartite partition between one qubit and
the rest qubits for those mixed states. The optimality of the decomposition is
ensured by the Coffman-Kundu-Wootters (CKW) inequality which describes the
monogamy of quantum entanglement. The generalized monogamy inequality is found
to be true for W class states with arbitrary partitions between one qubit and
multi-qubit.
|
quant-ph
|
we analyze mixed multiqubit states composed of a w class state and a product state with all qubit in 0 we find the optimal pure state decomposition and convex roofs for highertangle with bipartite partition between one qubit and the rest qubits for those mixed states the optimality of the decomposition is ensured by the coffmankunduwootters ckw inequality which describes the monogamy of quantum entanglement the generalized monogamy inequality is found to be true for w class states with arbitrary partitions between one qubit and multiqubit
|
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|
[-0.13249268759699429, 0.21242623838924748, -0.03969350228195681, 0.04620753577362527, 0.0358923732467434, -0.275333089688245, 0.06023294597809367, 0.3118211338186965, -0.25157518261934025, -0.2640182458959958, 0.05280902494046399, -0.27015232966445824, -0.0474883757695994, 0.13441347660606398, -0.030758290190030547, 0.11597600971512935, 0.08620371774715536, 0.03246425729902352, -0.09074682149049991, -0.24704074933851028, 0.3687809121849782, -0.10003441662308486, 0.30904937040279895, 0.004598629764993401, 0.09581576962681378, 0.02537546178106876, 0.10482574143611333, -0.014305481774842038, -0.1102516474750112, 0.12000250853940515, 0.2926702475723098, 0.18019421387135107, 0.2323898301788551, -0.3649852970505462, -0.10759833130218527, 0.174805991225602, 0.03441113254384083, 0.13553945477367105, 0.020010396509486085, -0.36034507166375135, 0.01781865011982839, -0.19253128141383916, -0.10270520461284939, -0.08754881613285226, 0.02299586874432862, -0.07351803713861634, -0.30125720027615044, 0.1277577555135769, 0.07004757665700334, -0.030741083890418797, -0.04928894498768975, -0.09894248139770592, -0.030070328668636435, 0.08943630412823575, -0.11422908408567309, -0.010455750635660746, 0.07902345953180509, -0.09097411718000384, -0.171945773404749, 0.28694429570699437, -0.017460242615026586, -0.2702213034033775, 0.1344752402688541, -0.12477834297563223, -0.13422256012255435, -0.008023443379822899, 0.06688936525846229, 0.09543337933171321, -0.09734160390627734, 0.057790622145266216, -0.06767486795125639, 0.17977753381299622, 0.07714237393400468, 0.17189283698578092, 0.12487175534753238, 0.03801390841493712, 0.1652928444721243, 0.31064848416512286, -0.01346040119362228, -0.1583034900784054, -0.3334134741741068, -0.2651656865306637, -0.2530710976228447, 0.13350718985585605, -0.0860520288012648, -0.12035040248404531, 0.4123378308489919, -0.009222063727622085, 0.10681510878836407, 0.05870425634442226, 0.18742558810969487, 0.11865224975216038, 0.024409090804264826, 0.1263865790932494, 0.22364419863066254, 0.2238618844161358, 0.014589379245744032, -0.26297785614562386, 0.09140688729308108, 0.08563324536251671]
|
707.1579
|
Stable stochastic dynamics in yeast cell cycle
|
Chemical reactions in cell are subject to intense stochastic fluctuations. An
important question is how the fundamental physiological behavior of cell is
kept stable against those noisy perturbations. In this paper a stochastic model
of cell cycle of budding yeast is constructed to analyze the effects of noise
on the cell cycle oscillation. The model predicts intense noise in levels of
mRNAs and proteins, and the simulated protein levels explain the observed
statistical tendency of noise in populations of synchronous and asynchronous
cells. In spite of intense noise in levels of proteins and mRNAs, cell cycle is
stable enough to bring the largely perturbed cells back to the physiological
cyclic oscillation. The model shows that consecutively appearing fixed points
are the origin of this stability of cell cycle.
|
q-bio.MN
|
chemical reactions in cell are subject to intense stochastic fluctuations an important question is how the fundamental physiological behavior of cell is kept stable against those noisy perturbations in this paper a stochastic model of cell cycle of budding yeast is constructed to analyze the effects of noise on the cell cycle oscillation the model predicts intense noise in levels of mrnas and proteins and the simulated protein levels explain the observed statistical tendency of noise in populations of synchronous and asynchronous cells in spite of intense noise in levels of proteins and mrnas cell cycle is stable enough to bring the largely perturbed cells back to the physiological cyclic oscillation the model shows that consecutively appearing fixed points are the origin of this stability of cell cycle
|
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|
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|
707.158
|
Theoretical Analysis of Astronomical Phased Arrays
|
Low-noise phased arrays are essential for the next generation of microwave
and submillimetre wave astronomy. We analyze their behaviour from a functional
perspective, and show that their operation is intimately related to the
mathematical theory of frames. No assumptions are made about the orthogonality
or linear independence of the synthesised beams. Frame theory allows an
unambiguous assessment of whether the outputs of an array can be used to
observe a field or brightness distribution within a given class. Image
reconstruction is carried out using dual beams. We identify the natural modes
of phased arrays, and carry out an analysis of noise. The scheme allows the
expectation values, the mean-square fluctuations, and the correlations between
fluctuations at the output ports of a phased array to be determined for a
source in any state of spatial coherence. Both classical and photon-counting
statistics are included. Our model is conceptually powerful, and suggests many
simulation and image recovery techniques.
|
astro-ph
|
lownoise phased arrays are essential for the next generation of microwave and submillimetre wave astronomy we analyze their behaviour from a functional perspective and show that their operation is intimately related to the mathematical theory of frames no assumptions are made about the orthogonality or linear independence of the synthesised beams frame theory allows an unambiguous assessment of whether the outputs of an array can be used to observe a field or brightness distribution within a given class image reconstruction is carried out using dual beams we identify the natural modes of phased arrays and carry out an analysis of noise the scheme allows the expectation values the meansquare fluctuations and the correlations between fluctuations at the output ports of a phased array to be determined for a source in any state of spatial coherence both classical and photoncounting statistics are included our model is conceptually powerful and suggests many simulation and image recovery techniques
|
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|
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|
707.1581
|
Statistical Mechanics of the Fluctuating Lattice Boltzmann Equation
|
We propose a new formulation of the fluctuating lattice Boltzmann equation
that is consistent with both equilibrium statististical mechanics and
fluctuating hydrodynamics. The formalism is based on a generalized lattice-gas
model, with each velocity direction occupied by many particles. We show that
the most probable state of this model corresponds to the usual equilibrium
distribution of the lattice Boltzmann equation. Thermal fluctuations about this
equilibrium are controlled by the mean number of particles at a lattice site.
Stochastic collision rules are described by a Monte Carlo process satisfying
detailed balance. This allows for a straightforward derivation of discrete
Langevin equations for the fluctuating modes. It is shown that all
non-conserved modes should be thermalized, as first pointed out by Adhikari et
al.; any other choice violates the condition of detailed balance. A
Chapman-Enskog analysis is used to derive the equations of fluctuating
hydrodynamics on large length and time scales; the level of fluctuations is
shown to be thermodynamically consistent with the equation of state of an
isothermal, ideal gas. We believe this formalism will be useful in developing
new algorithms for thermal and multiphase flows.
|
cond-mat.soft
|
we propose a new formulation of the fluctuating lattice boltzmann equation that is consistent with both equilibrium statististical mechanics and fluctuating hydrodynamics the formalism is based on a generalized latticegas model with each velocity direction occupied by many particles we show that the most probable state of this model corresponds to the usual equilibrium distribution of the lattice boltzmann equation thermal fluctuations about this equilibrium are controlled by the mean number of particles at a lattice site stochastic collision rules are described by a monte carlo process satisfying detailed balance this allows for a straightforward derivation of discrete langevin equations for the fluctuating modes it is shown that all nonconserved modes should be thermalized as first pointed out by adhikari et al any other choice violates the condition of detailed balance a chapmanenskog analysis is used to derive the equations of fluctuating hydrodynamics on large length and time scales the level of fluctuations is shown to be thermodynamically consistent with the equation of state of an isothermal ideal gas we believe this formalism will be useful in developing new algorithms for thermal and multiphase flows
|
[['we', 'propose', 'a', 'new', 'formulation', 'of', 'the', 'fluctuating', 'lattice', 'boltzmann', 'equation', 'that', 'is', 'consistent', 'with', 'both', 'equilibrium', 'statististical', 'mechanics', 'and', 'fluctuating', 'hydrodynamics', 'the', 'formalism', 'is', 'based', 'on', 'a', 'generalized', 'latticegas', 'model', 'with', 'each', 'velocity', 'direction', 'occupied', 'by', 'many', 'particles', 'we', 'show', 'that', 'the', 'most', 'probable', 'state', 'of', 'this', 'model', 'corresponds', 'to', 'the', 'usual', 'equilibrium', 'distribution', 'of', 'the', 'lattice', 'boltzmann', 'equation', 'thermal', 'fluctuations', 'about', 'this', 'equilibrium', 'are', 'controlled', 'by', 'the', 'mean', 'number', 'of', 'particles', 'at', 'a', 'lattice', 'site', 'stochastic', 'collision', 'rules', 'are', 'described', 'by', 'a', 'monte', 'carlo', 'process', 'satisfying', 'detailed', 'balance', 'this', 'allows', 'for', 'a', 'straightforward', 'derivation', 'of', 'discrete', 'langevin', 'equations', 'for', 'the', 'fluctuating', 'modes', 'it', 'is', 'shown', 'that', 'all', 'nonconserved', 'modes', 'should', 'be', 'thermalized', 'as', 'first', 'pointed', 'out', 'by', 'adhikari', 'et', 'al', 'any', 'other', 'choice', 'violates', 'the', 'condition', 'of', 'detailed', 'balance', 'a', 'chapmanenskog', 'analysis', 'is', 'used', 'to', 'derive', 'the', 'equations', 'of', 'fluctuating', 'hydrodynamics', 'on', 'large', 'length', 'and', 'time', 'scales', 'the', 'level', 'of', 'fluctuations', 'is', 'shown', 'to', 'be', 'thermodynamically', 'consistent', 'with', 'the', 'equation', 'of', 'state', 'of', 'an', 'isothermal', 'ideal', 'gas', 'we', 'believe', 'this', 'formalism', 'will', 'be', 'useful', 'in', 'developing', 'new', 'algorithms', 'for', 'thermal', 'and', 'multiphase', 'flows']]
|
[-0.10644571749530175, 0.18426649670602827, -0.1528854499869656, 0.05520267455568975, -0.0659726056568932, -0.13532070634107146, 0.009943306913634802, 0.30366005544024316, -0.26941476511938556, -0.2672014294354164, 0.033483847043775626, -0.27299286803851, -0.07570308319839608, 0.14959677176565214, 0.004927347682456932, 0.0589345305855639, 0.07022833348626432, -0.012275420939777572, -0.04124263268085602, -0.20374040796330362, 0.2860930993939173, 0.11334879438673733, 0.28601427862683876, 0.020397321295129823, 0.14455770768488393, -0.0029057563743149135, -0.018115301679759083, 0.07477251336525154, -0.17861414165168832, 0.04915483914563716, 0.18063243866756395, 0.03754214392772511, 0.255619479900064, -0.45185310443174903, -0.2557485565978467, 0.06920187800373558, 0.134957124008234, 0.16063589486166957, -6.377186914703444e-05, -0.22617497431802686, 0.051742911832305886, -0.16062065407269352, -0.18400997748983133, -0.10128561901839693, 0.0012002036762525045, 0.034980765715970294, -0.27942454351274215, 0.14615700754549596, 0.05275610772071598, 0.03836471108092076, -0.06894471477900642, -0.10698420771286296, -0.049150476270132575, 0.034821069941086615, 0.0034404811295921127, 0.019201858724440884, 0.1323249791824745, -0.10135574774998847, -0.0910310780113239, 0.4189300188926332, -0.05617777657702707, -0.2408117361875433, 0.17267271466603826, -0.10879330247964548, -0.1279403016087599, 0.1499464482489123, 0.11228943496193412, 0.14563701700155987, -0.22182927508433553, 0.0512927764076148, -0.06533534272349915, 0.1466483533174893, -0.008998653130180648, -0.043526907747550664, 0.21874357053362156, 0.1693696943162333, 0.030504813903383405, 0.14426262060821857, -0.03367882658684444, -0.1978719697663505, -0.3356392055841001, -0.1581040725777316, -0.19991571904203106, 0.07719983492975387, -0.08645026492938443, -0.16004385749408317, 0.3242041939039431, 0.19000256463186815, 0.14844865515418781, 0.042327090911187595, 0.2599245887249708, 0.17019992261434116, -0.0015805474755799642, 0.11142445684052528, 0.21708926538438234, 0.15929448346508687, 0.1138868683053221, -0.2492146055193861, 0.05094043066429035, 0.10345432995413632]
|
707.1582
|
Stripe width and non-local domain walls in the two-dimensional Dipolar
Frustrated Ising Ferromagnet
|
We describe a novel type of magnetic domain wall which, in contrast to Bloch
or Neel walls, is non-localized and, in a certain temperature range,
non-monotonic. The wall appears as the mean-field solution of the
two-dimensional ferromagnetic Ising model frustrated by the long-ranged dipolar
interaction. We provide experimental evidence of this wall delocalization in
the stripe-domain phase of perpendicularly magnetized ultrathin magnetic films.
In agreement with experimental results, we find that the stripe width decreases
with increasing temperature and approaches a finite value at the
Curie-temperature following a power law. The same kind of wall and a similar
temperature dependence of the stripe width is expected in the mean-field
approximation of the two-dimensional Coulomb frustrated Ising ferromagnet.
|
cond-mat.stat-mech cond-mat.mtrl-sci
|
we describe a novel type of magnetic domain wall which in contrast to bloch or neel walls is nonlocalized and in a certain temperature range nonmonotonic the wall appears as the meanfield solution of the twodimensional ferromagnetic ising model frustrated by the longranged dipolar interaction we provide experimental evidence of this wall delocalization in the stripedomain phase of perpendicularly magnetized ultrathin magnetic films in agreement with experimental results we find that the stripe width decreases with increasing temperature and approaches a finite value at the curietemperature following a power law the same kind of wall and a similar temperature dependence of the stripe width is expected in the meanfield approximation of the twodimensional coulomb frustrated ising ferromagnet
|
[['we', 'describe', 'a', 'novel', 'type', 'of', 'magnetic', 'domain', 'wall', 'which', 'in', 'contrast', 'to', 'bloch', 'or', 'neel', 'walls', 'is', 'nonlocalized', 'and', 'in', 'a', 'certain', 'temperature', 'range', 'nonmonotonic', 'the', 'wall', 'appears', 'as', 'the', 'meanfield', 'solution', 'of', 'the', 'twodimensional', 'ferromagnetic', 'ising', 'model', 'frustrated', 'by', 'the', 'longranged', 'dipolar', 'interaction', 'we', 'provide', 'experimental', 'evidence', 'of', 'this', 'wall', 'delocalization', 'in', 'the', 'stripedomain', 'phase', 'of', 'perpendicularly', 'magnetized', 'ultrathin', 'magnetic', 'films', 'in', 'agreement', 'with', 'experimental', 'results', 'we', 'find', 'that', 'the', 'stripe', 'width', 'decreases', 'with', 'increasing', 'temperature', 'and', 'approaches', 'a', 'finite', 'value', 'at', 'the', 'curietemperature', 'following', 'a', 'power', 'law', 'the', 'same', 'kind', 'of', 'wall', 'and', 'a', 'similar', 'temperature', 'dependence', 'of', 'the', 'stripe', 'width', 'is', 'expected', 'in', 'the', 'meanfield', 'approximation', 'of', 'the', 'twodimensional', 'coulomb', 'frustrated', 'ising', 'ferromagnet']]
|
[-0.17390978481652664, 0.21094134028053618, -0.04005963565251822, 0.029214470588064208, -0.07881327220319032, -0.11569956181458486, 0.05011921188922535, 0.3911249661047397, -0.23873161915529134, -0.2574602275251828, 0.028396570528174975, -0.2995799964952186, -0.06999222919192358, 0.13816867019290682, 0.07127398278981704, 0.019109225241820616, -0.04202202045567462, -0.01160629470365981, -0.10569900676311025, -0.15888124996603564, 0.2523743182757934, -0.0551039365056003, 0.35083532167181114, 0.12451904459358674, 0.02132300018927018, -0.00035232983545625005, 0.1482618871538354, 0.08575033569499722, -0.21805061534648523, 0.0014166348625841583, 0.2027721585919639, -0.1393959262791684, 0.21065606326185937, -0.4354228747783807, -0.1998430455308247, 0.037943607918789674, 0.17670330975268936, 0.1708096443496821, -0.05971316090716723, -0.2761912707024623, 0.03856232108704842, -0.1699952631165145, -0.1751433942689769, -0.04036754819703517, -0.007866806792223761, 0.06275672614092714, -0.2809987584016575, 0.15749730669154688, 0.125927405199036, 0.10513741117580955, -0.12156522844050979, -0.08666604675818235, -0.059325837453923606, 0.0365525317550958, 0.06891526905960275, 0.1306847946654106, 0.1375280232329307, -0.1734539324815128, -0.1221740969440675, 0.3336235199300251, -0.07637526331959164, -0.11617904964730079, 0.1763401773661889, -0.2143685108909769, -0.04071060431607325, 0.16140932058072488, 0.12682178419571097, 0.08156600711268326, -0.0882928441920928, 0.09660957676457875, -0.05163621275027379, 0.20257323474928352, 0.016035894359510135, -0.004836254338254642, 0.25424956668826654, 0.24561214561831077, 0.035196689784462595, 0.2271077509684456, -0.12388143634246983, -0.14472340683227983, -0.26153882835381503, -0.12157607039211896, -0.2470532440247239, 0.038860296272544254, -0.13841200114495286, -0.24997778843028534, 0.3845747963574028, 0.17565012891808973, 0.18258761837958068, -0.0033587704498947053, 0.24510316670358437, 0.10161988439885418, 0.04024697292660331, 0.028419985749020146, 0.24709330272764482, 0.16876048276778952, 0.1698288540917866, -0.28131535878918806, 0.030903880944041985, 0.03677658967127831]
|
707.1583
|
A multi-blob representation of semi-dilute polymer solutions
|
A coarse-grained multi-blob description of polymer solutions is presented,
based on soft, transferable effective interactions between bonded and
non-bonded blobs. The number of blobs is chosen such that the blob density does
not exceed their overlap threshold, allowing polymer concentrations to be
explored deep into the semi-dilute regime. This quantitative multi-blob
description is shown to preserve known scaling laws of polymer solutions and
provides accurate estimates of amplitudes, while leading to orders of magnitude
increase of simulation efficiency and allowing analytic calculations of
structural and thermodynamic properties.
|
cond-mat.soft cond-mat.stat-mech
|
a coarsegrained multiblob description of polymer solutions is presented based on soft transferable effective interactions between bonded and nonbonded blobs the number of blobs is chosen such that the blob density does not exceed their overlap threshold allowing polymer concentrations to be explored deep into the semidilute regime this quantitative multiblob description is shown to preserve known scaling laws of polymer solutions and provides accurate estimates of amplitudes while leading to orders of magnitude increase of simulation efficiency and allowing analytic calculations of structural and thermodynamic properties
|
[['a', 'coarsegrained', 'multiblob', 'description', 'of', 'polymer', 'solutions', 'is', 'presented', 'based', 'on', 'soft', 'transferable', 'effective', 'interactions', 'between', 'bonded', 'and', 'nonbonded', 'blobs', 'the', 'number', 'of', 'blobs', 'is', 'chosen', 'such', 'that', 'the', 'blob', 'density', 'does', 'not', 'exceed', 'their', 'overlap', 'threshold', 'allowing', 'polymer', 'concentrations', 'to', 'be', 'explored', 'deep', 'into', 'the', 'semidilute', 'regime', 'this', 'quantitative', 'multiblob', 'description', 'is', 'shown', 'to', 'preserve', 'known', 'scaling', 'laws', 'of', 'polymer', 'solutions', 'and', 'provides', 'accurate', 'estimates', 'of', 'amplitudes', 'while', 'leading', 'to', 'orders', 'of', 'magnitude', 'increase', 'of', 'simulation', 'efficiency', 'and', 'allowing', 'analytic', 'calculations', 'of', 'structural', 'and', 'thermodynamic', 'properties']]
|
[-0.08868785817898682, 0.12184371321793945, -0.09796208369441266, 0.04646950962032652, -0.052733982689732194, -0.12671428068337598, 0.03333526192468473, 0.39456193926262445, -0.2016723103949736, -0.3101347360449533, 0.008561266430964073, -0.27490442888490085, -0.10743589669428552, 0.15559311850992, 0.014325895630379861, 0.07781773278939313, 0.04289506185778427, -0.02439511807678246, -0.06471685068574788, -0.1760798356463683, 0.18584603380583142, 0.08315857926660603, 0.29616767160551644, 0.10135418397171059, 0.12764043992535137, -0.00576287850566294, -0.010253240803963152, 0.08674285687163644, -0.2161456928458821, 0.14701492794864307, 0.24182763598168847, 0.029440605665032548, 0.20660501951887006, -0.4783574305260661, -0.2255070192482451, 0.05261184240493324, 0.20009535026332448, 0.1184802137973622, 0.013951191536803869, -0.21911784062889972, 0.08334017018573465, -0.17947253582720785, -0.15460194196637678, -0.1257430369264564, 0.02809075581380862, 0.10681290772740847, -0.25809120630374416, 0.13362409937531344, 0.03941788926356654, 0.003967649594331347, -0.060607142286139656, -0.08375983636012707, -0.04682156915680088, 0.126981511845885, 0.051178381556174025, -0.0012004228854744598, 0.23396898165944663, -0.1775483235304683, -0.030526719238052422, 0.37986991423631794, -0.003217568005510103, -0.17124604068471697, 0.27011331318792, -0.12737636133257685, -0.09582522051708622, 0.21987907281252503, 0.11039575417365494, 0.10401491263022261, -0.14031695856595006, 0.05092628074049864, 0.015185273995077044, 0.2365721564996859, 0.05751522995488739, 0.05581888606257994, 0.183676158704249, 0.19032708603631834, 0.01748772699321652, 0.14930011556703254, -0.03213958819022124, -0.13687058280746656, -0.2673344707394811, -0.11289154262206351, -0.16089532811237478, 0.03970674060210826, -0.11526104205103334, -0.2067105334165811, 0.3596367268534056, 0.15498625825362644, 0.17228354453697972, 0.10263856731076863, 0.2350904945506254, 0.10397424501762993, 0.07120833375448382, 0.03555468839175742, 0.2706337344415229, 0.15872154252111226, 0.05275347026803627, -0.21329197167129865, 0.08758661106774776, 0.11596445569864891]
|
707.1584
|
On the K^+D Interaction at Low Energies
|
The Kd reactions are considered in the impulse approximation with NN
final-state interactions (NN FSI) taken into account. The realistic parameters
for the KN phase shifts are used. The "quasi-elastic" energy region, in which
the elementary KN interaction is predominantly elastic, is considered. The
theoretical predictions are compared with the data on the K^+d->K^+pn,
K^+d->K^0pp, K^+d->K^+d and K^+d total cross sections. The NN FSI effect in the
reaction K^+d->K^+pn has been found to be large. The predictions for the Kd
cross sections are also given for slow kaons, produced from phi(1020) decays,
as the functions of the isoscalar KN scattering length a_0. These predictions
can be used to extract the value of a_0 from the data.
|
nucl-th
|
the kd reactions are considered in the impulse approximation with nn finalstate interactions nn fsi taken into account the realistic parameters for the kn phase shifts are used the quasielastic energy region in which the elementary kn interaction is predominantly elastic is considered the theoretical predictions are compared with the data on the kdkpn kdk0pp kdkd and kd total cross sections the nn fsi effect in the reaction kdkpn has been found to be large the predictions for the kd cross sections are also given for slow kaons produced from phi1020 decays as the functions of the isoscalar kn scattering length a_0 these predictions can be used to extract the value of a_0 from the data
|
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|
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|
707.1585
|
Experimental application of sum rules for electron energy loss magnetic
chiral dichroism
|
We present a derivation of the orbital and spin sum rules for magnetic
circular dichroic spectra measured by electron energy loss spectroscopy in a
transmission electron microscope. These sum rules are obtained from the
differential cross section calculated for symmetric positions in the
diffraction pattern. Orbital and spin magnetic moments are expressed explicitly
in terms of experimental spectra and dynamical diffraction coefficients. We
estimate the ratio of spin to orbital magnetic moments and discuss first
experimental results for the Fe L_{2,3} edge.
|
cond-mat.other
|
we present a derivation of the orbital and spin sum rules for magnetic circular dichroic spectra measured by electron energy loss spectroscopy in a transmission electron microscope these sum rules are obtained from the differential cross section calculated for symmetric positions in the diffraction pattern orbital and spin magnetic moments are expressed explicitly in terms of experimental spectra and dynamical diffraction coefficients we estimate the ratio of spin to orbital magnetic moments and discuss first experimental results for the fe l_23 edge
|
[['we', 'present', 'a', 'derivation', 'of', 'the', 'orbital', 'and', 'spin', 'sum', 'rules', 'for', 'magnetic', 'circular', 'dichroic', 'spectra', 'measured', 'by', 'electron', 'energy', 'loss', 'spectroscopy', 'in', 'a', 'transmission', 'electron', 'microscope', 'these', 'sum', 'rules', 'are', 'obtained', 'from', 'the', 'differential', 'cross', 'section', 'calculated', 'for', 'symmetric', 'positions', 'in', 'the', 'diffraction', 'pattern', 'orbital', 'and', 'spin', 'magnetic', 'moments', 'are', 'expressed', 'explicitly', 'in', 'terms', 'of', 'experimental', 'spectra', 'and', 'dynamical', 'diffraction', 'coefficients', 'we', 'estimate', 'the', 'ratio', 'of', 'spin', 'to', 'orbital', 'magnetic', 'moments', 'and', 'discuss', 'first', 'experimental', 'results', 'for', 'the', 'fe', 'l_23', 'edge']]
|
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|
707.1586
|
Charged-Particle Multiplicities in Charged-Current Neutrino-- and
Anti-Neutrino--Nucleus Interactions
|
The CHORUS experiment, designed to search for $\nu_{\mu}\to\nu_{\tau}$
oscillations, consists of a nuclear emulsion target and electronic detectors.
In this paper, results on the production of charged particles in a small sample
of charged-current neutrino-- and anti-neutrino--nucleus interactions at high
energy are presented. For each event, the emission angle and the ionization
features of the charged particles produced in the interaction are recorded,
while the standard kinematic variables are reconstructed using the electronic
detectors. The average multiplicities for charged tracks, the pseudo-rapidity
distributions, the dispersion in the multiplicity of charged particles and the
KNO scaling are studied in different kinematical regions. A study of
quasi-elastic topologies performed for the first time in nuclear emulsions is
also reported. The results are presented in a form suitable for use in the
validation of Monte Carlo generators of neutrino--nucleus interactions.
|
hep-ex
|
the chorus experiment designed to search for nu_mutonu_tau oscillations consists of a nuclear emulsion target and electronic detectors in this paper results on the production of charged particles in a small sample of chargedcurrent neutrino and antineutrinonucleus interactions at high energy are presented for each event the emission angle and the ionization features of the charged particles produced in the interaction are recorded while the standard kinematic variables are reconstructed using the electronic detectors the average multiplicities for charged tracks the pseudorapidity distributions the dispersion in the multiplicity of charged particles and the kno scaling are studied in different kinematical regions a study of quasielastic topologies performed for the first time in nuclear emulsions is also reported the results are presented in a form suitable for use in the validation of monte carlo generators of neutrinonucleus interactions
|
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|
[-0.08574067761129053, 0.21073846383033878, -0.07253029620033573, 0.131532893869618, 0.04627350762989508, -0.06452050243069275, -0.03555126793352873, 0.36191580689301456, -0.17843099888822023, -0.3421829672136011, -0.01573611213315795, -0.377622517410421, 0.014704196204016678, 0.1708152594926842, 0.072800475036739, 0.08379555061242006, 0.11599953522069556, 0.017363664133297485, -0.06586865988648395, -0.15889335843907793, 0.285122705897126, 0.11860263728312333, 0.250582650208669, 0.0711067424896751, 0.10766712798572138, 0.05963414965875542, -0.07511056270781755, 0.010357560603505504, -0.125058377568757, 0.06627785641977046, 0.2678324126372501, 0.05108055918661021, 0.1280045333100877, -0.4167576823652833, -0.12552075882707417, 0.11071535975189649, 0.14364007091741113, 0.06891229540431688, -0.1418507878089079, -0.31028400293898084, 0.05600396844190477, -0.17774657040569306, -0.11353506934387188, -0.02676271698199702, -0.005818930726471173, 0.09277375574167614, -0.2815308645095703, 0.09194425380101298, -0.03571393816046974, 0.037886328106392586, -0.07139080393903066, -0.1414961582457606, -0.008596634169374286, 0.08630519921816614, 0.07154557580743529, -0.024218152260176675, 0.1982965731847161, -0.16764246730004728, -0.14207024490936612, 0.3522473579191052, -0.0034794255387527446, -0.20048995081838356, 0.19010204959314073, -0.22401008948031134, -0.1325280966057041, 0.19493157613553433, 0.2385764165380358, 0.14456566984010658, -0.22685980753986723, 0.059112229817852815, -0.017687336262995308, 0.12905702004922948, 0.0402444957476789, 0.03201490369401056, 0.17447614488293872, 0.24141701449551722, -0.028928640570039486, 0.09607072348067415, -0.18016688414019988, -0.07966759427702122, -0.3543475226628302, -0.16076300318529627, -0.12866447302410855, -0.018982327513457922, -0.055531496375401494, -0.12466975099604277, 0.4029277314340193, 0.09835563773337333, 0.2067468808352077, -0.011693452328552295, 0.2828887878869572, 0.023942655061174482, 0.059917046083264855, 0.028462518866507025, 0.3192359720987487, 0.12929808328703155, 0.14097861812898657, -0.23257239272029404, 0.07866103392787767, 0.03794722924056551]
|
707.1587
|
Constraints on Neutralino masses and mixings from Cosmology and Collider
Physics
|
Bounds on cross section measurements of chargino pair production at LEP yield
a bound on the chargino mass. If the GUT relation is assumed, the lightest
neutralino must be heavier than $\approx 45 -50\GeV$. If no GUT relation is
assumed, no lower bound on the neutralino mass exists. I derive mass bounds on
the lightest neutralino from relic density measurements for relativistic and
non-relativistic neutralinos and I derive bounds on the selectron mass from the
observed limits on the cross section of the neutralino pair production process
$e^+e^-\to \x{1}\x{2}$ at LEP, if the lightest neutralino is massless. I
further discuss radiative neutralino production and its background at the
future ILC. Finally, I present a method to determine the neutralino couplings
to right and left handed selectrons and Z bosons from cross section
measurements of radiative neutralino production and neutralino pair production
at the ILC.
|
hep-ph
|
bounds on cross section measurements of chargino pair production at lep yield a bound on the chargino mass if the gut relation is assumed the lightest neutralino must be heavier than approx 45 50gev if no gut relation is assumed no lower bound on the neutralino mass exists i derive mass bounds on the lightest neutralino from relic density measurements for relativistic and nonrelativistic neutralinos and i derive bounds on the selectron mass from the observed limits on the cross section of the neutralino pair production process eeto x1x2 at lep if the lightest neutralino is massless i further discuss radiative neutralino production and its background at the future ilc finally i present a method to determine the neutralino couplings to right and left handed selectrons and z bosons from cross section measurements of radiative neutralino production and neutralino pair production at the ilc
|
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|
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|
707.1588
|
A Tight Lower Bound to the Outage Probability of Discrete-Input
Block-Fading Channels
|
In this correspondence, we propose a tight lower bound to the outage
probability of discrete-input Nakagami-m block-fading channels. The approach
permits an efficient method for numerical evaluation of the bound, providing an
additional tool for system design. The optimal rate-diversity trade-off for the
Nakagami-m block-fading channel is also derived and a tight upper bound is
obtained for the optimal coding gain constant.
|
cs.IT math.IT
|
in this correspondence we propose a tight lower bound to the outage probability of discreteinput nakagamim blockfading channels the approach permits an efficient method for numerical evaluation of the bound providing an additional tool for system design the optimal ratediversity tradeoff for the nakagamim blockfading channel is also derived and a tight upper bound is obtained for the optimal coding gain constant
|
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|
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|
707.1589
|
Analytic theory of narrow lattice solitons
|
The profiles of narrow lattice solitons are calculated analytically using
perturbation analysis. A stability analysis shows that solitons centered at a
lattice (potential) maximum are unstable, as they drift toward the nearest
lattice minimum. This instability can, however, be so weak that the soliton is
``mathematically unstable'' but ``physically stable''. Stability of solitons
centered at a lattice minimum depends on the dimension of the problem and on
the nonlinearity. In the subcritical and supercritical cases, the lattice does
not affect the stability, leaving the solitons stable and unstable,
respectively. In contrast, in the critical case (e.g., a cubic nonlinearity in
two transverse dimensions), the lattice stabilizes the (previously unstable)
solitons. The stability in this case can be so weak, however, that the soliton
is ``mathematically stable'' but ``physically unstable''.
|
nlin.PS
|
the profiles of narrow lattice solitons are calculated analytically using perturbation analysis a stability analysis shows that solitons centered at a lattice potential maximum are unstable as they drift toward the nearest lattice minimum this instability can however be so weak that the soliton is mathematically unstable but physically stable stability of solitons centered at a lattice minimum depends on the dimension of the problem and on the nonlinearity in the subcritical and supercritical cases the lattice does not affect the stability leaving the solitons stable and unstable respectively in contrast in the critical case eg a cubic nonlinearity in two transverse dimensions the lattice stabilizes the previously unstable solitons the stability in this case can be so weak however that the soliton is mathematically stable but physically unstable
|
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|
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|
707.159
|
Tidal and rotational effects in the perturbations of hierarchical triple
stellar systems. II. Eccentric systems - the case of AS Camelopardalis
|
We study the perturbations of a relatively close third star on a tidally
distorted eccentric eclipsing binary. We consider both the observational
consequences of the variations of the orbital elements and the interactions of
the stellar rotation with the orbital revolution in the presence of
dissipation. We concentrate mainly on the effect of a hypothetical third
companion on both the real, and the observed apsidal motion period. We
investigate how the observed period derived mainly from some variants of the
O-C relates to the real apsidal motion period. We carried out both analytical
and numerical investigations and give the time variations of the orbital
elements of the binary both in the dynamical and the observational reference
frames. We give the direct analytical form of an eclipsing O-C affected
simultaneously by the mutual tidal forces and the gravitational interactions
with a tertiary. We also integrated numerically simultaneously the orbital and
rotational equations for the possible hierarchical triple stellar system AS
Camelopardalis. We find that there is a significant domain of the possible
hierarchical triple system configurations, where both the dynamical and the
observational effects tend to measure longer apsidal advance rate than is
expected theoretically. This happens when the mutual inclination of the close
and the wide orbits is large, and the orbital plane of the tertiary almost
coincides with the plane of the sky. We also obtain new numerical results on
the interaction of the orbital evolution and stellar rotation in such triplets.
The most important fact is that resonances might occur as the stellar
rotational rate varies during the dissipation-driven synchronization process...
|
astro-ph
|
we study the perturbations of a relatively close third star on a tidally distorted eccentric eclipsing binary we consider both the observational consequences of the variations of the orbital elements and the interactions of the stellar rotation with the orbital revolution in the presence of dissipation we concentrate mainly on the effect of a hypothetical third companion on both the real and the observed apsidal motion period we investigate how the observed period derived mainly from some variants of the oc relates to the real apsidal motion period we carried out both analytical and numerical investigations and give the time variations of the orbital elements of the binary both in the dynamical and the observational reference frames we give the direct analytical form of an eclipsing oc affected simultaneously by the mutual tidal forces and the gravitational interactions with a tertiary we also integrated numerically simultaneously the orbital and rotational equations for the possible hierarchical triple stellar system as camelopardalis we find that there is a significant domain of the possible hierarchical triple system configurations where both the dynamical and the observational effects tend to measure longer apsidal advance rate than is expected theoretically this happens when the mutual inclination of the close and the wide orbits is large and the orbital plane of the tertiary almost coincides with the plane of the sky we also obtain new numerical results on the interaction of the orbital evolution and stellar rotation in such triplets the most important fact is that resonances might occur as the stellar rotational rate varies during the dissipationdriven synchronization process
|
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|
[-0.2104625896880042, 0.1212788910889744, -0.07354142869682806, 0.08728349935944099, -0.08615477985663503, -0.03968400994630906, 0.06039948983911045, 0.34395193624462467, -0.2550296829044004, -0.3046709519506436, 0.09058345074830895, -0.25906099651377124, -0.14756473857633232, 0.2108169587828332, -0.041394677418620525, 0.02573958475376433, 0.11163548407624671, 0.04030480886368654, -0.07591279894653566, -0.24170056518836536, 0.3182895221418131, 0.04492139474563159, 0.1231680690643321, -0.0035598040399045998, 0.07683357828519813, 0.015092991264590095, -0.028481826415358947, -0.04073824189973379, -0.16586904150741255, 0.08293526243083872, 0.15354407511286555, 0.09415798616939058, 0.1923211152406813, -0.3802762430129367, -0.16157489968552308, 0.06790844786791804, 0.15490143604137485, 0.11183759565164154, -0.05464098802209963, -0.26516784278644046, 0.049991766850467585, -0.19262597048761387, -0.14631336998059893, -0.018052465673677708, 0.09461445383330942, 0.05229037221142236, -0.23865490968732214, 0.0995505752576207, 0.09341298991052023, 0.1057123701573268, -0.1433383271393823, -0.08954435426603734, -0.08231615619964104, 0.12940016490845063, 0.09567768621900714, 0.029917535198562044, 0.10219967578619209, -0.06423410816833433, -0.07297054905366478, 0.42304862616406647, -0.07308809229947615, -0.1479767000500977, 0.22282122707653068, -0.21206683869572787, -0.10854967321559589, 0.11330282135898452, 0.19812393487703778, 0.1273083801119245, -0.14013878707164243, 0.020367509831750532, 0.010071945532504824, 0.19085930360431566, 0.06116744991880576, 0.03067520450793575, 0.3133138642210811, 0.12458177383178172, 0.022650958632894513, 0.12090781540609896, -0.19355325147637056, -0.12427655961798299, -0.24264249921964035, -0.08994075532173985, -0.1297119414378949, 0.0244036143488063, -0.12043100655358417, -0.13580922873782794, 0.39488889856579157, 0.13551480641248617, 0.20791942596492205, 0.01358908397134946, 0.2929323749128063, 0.1205893608882223, 0.05683918111906042, 0.06029069388795205, 0.3323773142263982, 0.14441508635172104, 0.07753896778414004, -0.30676893872463856, 0.08822922302346266, -0.013031192655062494]
|
707.1591
|
Invisibly decaying Higgs boson in the Littlest Higgs model with T-parity
|
We show that there are regions in the parameter space of the Littlest Higgs
model with T-parity, allowed by electroweak precision data, where the Higgs
boson can decay invisibly into a pair of heavy photons A_H with a substantial
branching ratio. For a symmetry breaking scale f in the range 450-600 GeV, the
BR(H -> A_H A_H) can be up to 95% for an intermediate mass Higgs, and from 20%
down to a few percents for a Higgs boson of mass 200 GeV or above. The total
decay width of the Higgs boson can thereby be enhanced by an order of magnitude
compared to the Standard Model for Higgs masses around 130 GeV.
|
hep-ph
|
we show that there are regions in the parameter space of the littlest higgs model with tparity allowed by electroweak precision data where the higgs boson can decay invisibly into a pair of heavy photons a_h with a substantial branching ratio for a symmetry breaking scale f in the range 450600 gev the brh a_h a_h can be up to 95 for an intermediate mass higgs and from 20 down to a few percents for a higgs boson of mass 200 gev or above the total decay width of the higgs boson can thereby be enhanced by an order of magnitude compared to the standard model for higgs masses around 130 gev
|
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|
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|
707.1592
|
Light Cone QCD Sum Rules Analysis of the Axial N -> Delta Transition
Form Factors
|
The axial N-> Delta(1232) transition form factors are calculated within the
light cone QCD sum rules method. A comparison of our results with predictions
of lattice theory and quark model calculations is pre- sented.
|
hep-ph
|
the axial n delta1232 transition form factors are calculated within the light cone qcd sum rules method a comparison of our results with predictions of lattice theory and quark model calculations is pre sented
|
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|
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|
707.1593
|
Impact of and constraints on PDFs at LHC
|
Uncertainties on parton distribution functions (PDFs) compromise discovery at
the LHC for any new physics which can be described as a contact-interaction.
PDF uncertainties also limit our ability to use W and Z cross-sections as an
accurate luminosity monitor. The impact of the current level of PDF uncertainty
on LHC physics is reviewed and the possibility of reducing this uncertainty
using LHC data is investigated.
|
hep-ph hep-ex
|
uncertainties on parton distribution functions pdfs compromise discovery at the lhc for any new physics which can be described as a contactinteraction pdf uncertainties also limit our ability to use w and z crosssections as an accurate luminosity monitor the impact of the current level of pdf uncertainty on lhc physics is reviewed and the possibility of reducing this uncertainty using lhc data is investigated
|
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|
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|
707.1594
|
Scale Transformations, Tree-level Perturbation Theory, and the
Cosmological Matter Bispectrum
|
Scale transformations have played an extremely successful role in studies of
cosmological large-scale structure by relating the non-linear spectrum of
cosmological density fluctuations to the linear primordial power at longer
wavelengths. Here we generalize this approach to investigate the usefulness of
scale transformations for nonlinear higher-order statistics, specifically the
bispectrum. We find that the bispectrum predicted by perturbation theory at
tree-level can be rescaled to match the results of full numerical simulations
in the weakly and intermediately nonlinear regimes, especially at high
redshifts, with an accuracy that is surprising given the simplicity of the
procedure used. This discovery not only offers a simple practical way of
calculating the matter bispectrum, but also suggests that scale transformations
may yet yield even deeper insights into the physics of hierarchical clustering.
|
astro-ph
|
scale transformations have played an extremely successful role in studies of cosmological largescale structure by relating the nonlinear spectrum of cosmological density fluctuations to the linear primordial power at longer wavelengths here we generalize this approach to investigate the usefulness of scale transformations for nonlinear higherorder statistics specifically the bispectrum we find that the bispectrum predicted by perturbation theory at treelevel can be rescaled to match the results of full numerical simulations in the weakly and intermediately nonlinear regimes especially at high redshifts with an accuracy that is surprising given the simplicity of the procedure used this discovery not only offers a simple practical way of calculating the matter bispectrum but also suggests that scale transformations may yet yield even deeper insights into the physics of hierarchical clustering
|
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|
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|
707.1595
|
Low Energy Supersymmetry from Non-Geometry
|
We study a class of flux compactifications that have all the moduli
stabilised, a high (GUT) string scale and a low (TeV) gravitino mass that is
generated dynamically. These non-geometric compactifications correspond to type
II string theories on SU(3)xSU(3) structure orientifolds. The resulting
superpotentials admit, excluding non-perturbative effects, supersymmetric
Minkowski vacua with any number of moduli stabilised. We argue that
non-perturbative effects are present and introduce terms in the superpotential
that are exponentially suppressed by the same moduli that appear
perturbatively. These deform the supersymmetric Minkowski vacua to
supersymmetric AdS vacua with an exponentially small gravitino mass. The
resulting vacua allow for low scale supersymmetry breaking which can be
realised by a number of mechanisms.
|
hep-th
|
we study a class of flux compactifications that have all the moduli stabilised a high gut string scale and a low tev gravitino mass that is generated dynamically these nongeometric compactifications correspond to type ii string theories on su3xsu3 structure orientifolds the resulting superpotentials admit excluding nonperturbative effects supersymmetric minkowski vacua with any number of moduli stabilised we argue that nonperturbative effects are present and introduce terms in the superpotential that are exponentially suppressed by the same moduli that appear perturbatively these deform the supersymmetric minkowski vacua to supersymmetric ads vacua with an exponentially small gravitino mass the resulting vacua allow for low scale supersymmetry breaking which can be realised by a number of mechanisms
|
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|
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|
707.1596
|
From Useful Algorithms for Slowly Convergent Series to Physical
Predictions Based on Divergent Perturbative Expansions
|
This review is focused on the borderline region of theoretical physics and
mathematics. First, we describe numerical methods for the acceleration of the
convergence of series. These provide a useful toolbox for theoretical physics
which has hitherto not received the attention it actually deserves. The
unifying concept for convergence acceleration methods is that in many cases,
one can reach much faster convergence than by adding a particular series term
by term. In some cases, it is even possible to use a divergent input series,
together with a suitable sequence transformation, for the construction of
numerical methods that can be applied to the calculation of special functions.
This review both aims to provide some practical guidance as well as a
groundwork for the study of specialized literature. As a second topic, we
review some recent developments in the field of Borel resummation, which is
generally recognized as one of the most versatile methods for the summation of
factorially divergent (perturbation) series. Here, the focus is on algorithms
which make optimal use of all information contained in a finite set of
perturbative coefficients. The unifying concept for the various aspects of the
Borel method investigated here is given by the singularities of the Borel
transform, which introduce ambiguities from a mathematical point of view and
lead to different possible physical interpretations. The two most important
cases are: (i) the residues at the singularities correspond to the decay width
of a resonance, and (ii) the presence of the singularities indicates the
existence of nonperturbative contributions which cannot be accounted for on the
basis of a Borel resummation and require generalizations toward resurgent
expansions. Both of these cases are illustrated by examples.
|
physics.comp-ph physics.atom-ph
|
this review is focused on the borderline region of theoretical physics and mathematics first we describe numerical methods for the acceleration of the convergence of series these provide a useful toolbox for theoretical physics which has hitherto not received the attention it actually deserves the unifying concept for convergence acceleration methods is that in many cases one can reach much faster convergence than by adding a particular series term by term in some cases it is even possible to use a divergent input series together with a suitable sequence transformation for the construction of numerical methods that can be applied to the calculation of special functions this review both aims to provide some practical guidance as well as a groundwork for the study of specialized literature as a second topic we review some recent developments in the field of borel resummation which is generally recognized as one of the most versatile methods for the summation of factorially divergent perturbation series here the focus is on algorithms which make optimal use of all information contained in a finite set of perturbative coefficients the unifying concept for the various aspects of the borel method investigated here is given by the singularities of the borel transform which introduce ambiguities from a mathematical point of view and lead to different possible physical interpretations the two most important cases are i the residues at the singularities correspond to the decay width of a resonance and ii the presence of the singularities indicates the existence of nonperturbative contributions which cannot be accounted for on the basis of a borel resummation and require generalizations toward resurgent expansions both of these cases are illustrated by examples
|
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|
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|
707.1597
|
Toric Resolutions of Heterotic Orbifolds
|
We investigate resolutions of heterotic orbifolds using toric geometry. Our
starting point is provided by the recently constructed heterotic models on
explicit blowup of C^n/Z_n singularities. We show that the values of the
relevant integrals, computed there, can be obtained as integrals of divisors
(complex codimension one hypersurfaces) interpreted as (1,1)-forms in toric
geometry. Motivated by this we give a self contained introduction to toric
geometry for non-experts, focusing on those issues relevant for the
construction of heterotic models on toric orbifold resolutions. We illustrate
the methods by building heterotic models on the resolutions of C^2/Z_3, C^3/Z_4
and C^3/Z_2xZ_2'. We are able to obtain a direct identification between them
and the known orbifold models. In the C^3/Z_2xZ_2' case we observe that, in
spite of the existence of two inequivalent resolutions, fully consistent blowup
models of heterotic orbifolds can only be constructed on one of them.
|
hep-th
|
we investigate resolutions of heterotic orbifolds using toric geometry our starting point is provided by the recently constructed heterotic models on explicit blowup of cnz_n singularities we show that the values of the relevant integrals computed there can be obtained as integrals of divisors complex codimension one hypersurfaces interpreted as 11forms in toric geometry motivated by this we give a self contained introduction to toric geometry for nonexperts focusing on those issues relevant for the construction of heterotic models on toric orbifold resolutions we illustrate the methods by building heterotic models on the resolutions of c2z_3 c3z_4 and c3z_2xz_2 we are able to obtain a direct identification between them and the known orbifold models in the c3z_2xz_2 case we observe that in spite of the existence of two inequivalent resolutions fully consistent blowup models of heterotic orbifolds can only be constructed on one of them
|
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|
[-0.13392807003239998, 0.011193505554628145, -0.04845404678619363, 0.15587146458629933, -0.05308705706718481, -0.17344407864665198, -0.03129576361970976, 0.34215617747718674, -0.20295679540787306, -0.239684178493917, 0.13482553735068198, -0.24006930215141942, -0.1389645461297025, 0.22130688148253183, -0.14814991337738725, -0.01385094524600087, 0.04950118043941782, -0.007207527607938068, -0.12848920748607875, -0.33315570104039377, 0.41875610660968554, 0.00935390881204512, 0.2437585015496653, 0.0685336452184452, 0.13776432266523544, -0.05009615802555345, -0.029113338529391006, 0.01014492878716232, -0.1970200271200358, 0.16575853417937955, 0.30727374308321487, 0.07881707616292664, 0.07672043589991517, -0.4507252905750647, -0.2339900007110474, 0.12328068719378077, 0.14066878797782717, 0.13711383890687204, -0.003801052853911339, -0.26392093873679795, 0.07648484915100401, -0.13260415704765668, -0.16268311115305145, -0.13575487437063, -0.042554111459240734, 0.017197371589847736, -0.18426133831962943, -0.0139245799542146, 0.0385656652183065, 0.10293046011874038, -0.029446771054103413, -0.1047123181892352, -0.0841470719040242, 0.08203375030360702, 0.059899370103570014, -0.007828684775934866, 0.06826075354668622, -0.15792729095927724, -0.18239877781727248, 0.3336061723400942, -0.04187098703550873, -0.25331565413701657, 0.1670553364092484, -0.09897658450063318, -0.14969314396471922, 0.1183988577233524, 0.09170642972458154, 0.20779929387046853, -0.04279072740529147, 0.1572981342509997, -0.052721720581757836, 0.08364517621622428, 0.11745701070483644, -0.017280272020596184, 0.23261760142082089, 0.13612570733271745, 0.03311398278714882, 0.10982855191590109, -0.03863583575204959, -0.11625336224096827, -0.40419383807521725, -0.11020874589889394, -0.117793034186535, 0.1751848518744939, -0.09551940530339682, -0.14854584351026764, 0.39841895343528855, 0.11048217986374059, 0.23964591073389682, 0.066555927028983, 0.22200985085995248, 0.04098615789795682, 0.05795000791476923, 0.030752912066721667, 0.1771436176463289, 0.1315090463144265, 0.009832990413997322, -0.1501233248927747, -0.07440901303683252, 0.21023297567929453]
|
707.1598
|
Theory of radiation trapping by the accelerating solitons in optical
fibers
|
We present a theory describing trapping of the normally dispersive radiation
by the Raman solitons in optical fibers. Frequency of the radiation component
is continuously blue shifting, while the soliton is red shifting. Underlying
physics of the trapping effect is in the existence of the inertial gravity-like
force acting on light in the accelerating frame of reference. We present
analytical calculations of the rate of the opposing frequency shifts of the
soliton and trapped radiation and find it to be greater than the rate of the
red shift of the bare Raman soliton. Our findings are essential for
understanding of the continuous shift of the high frequency edge of the
supercontinuum spectra generated in photonic crystal fibers towards higher
frequencies.
|
physics.optics nlin.PS
|
we present a theory describing trapping of the normally dispersive radiation by the raman solitons in optical fibers frequency of the radiation component is continuously blue shifting while the soliton is red shifting underlying physics of the trapping effect is in the existence of the inertial gravitylike force acting on light in the accelerating frame of reference we present analytical calculations of the rate of the opposing frequency shifts of the soliton and trapped radiation and find it to be greater than the rate of the red shift of the bare raman soliton our findings are essential for understanding of the continuous shift of the high frequency edge of the supercontinuum spectra generated in photonic crystal fibers towards higher frequencies
|
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|
[-0.15035131122373666, 0.21971242873890637, -0.08216859199795484, -0.016926257066855518, -0.0561472061323002, -0.08183955046891546, 0.038946334329860596, 0.4496273732278496, -0.21775846157688647, -0.21627463396483412, 0.038413017433291924, -0.2786622836991834, -0.10041752889713583, 0.23337970717887704, -0.002551923717889319, 0.005393657235739132, 0.013437120414649447, 0.030271255764334152, 0.009776325694595774, -0.12431104194838553, 0.31361343498186517, 0.08716375183624527, 0.31085361309039095, 0.04387742199663383, 0.06180241320980713, 0.003209364782863607, -0.036418469859442366, -0.06487744570864985, -0.12024469941970892, 0.14154002905415836, 0.20599779174663127, 0.016974427888635547, 0.26355324655305595, -0.40608818881834546, -0.2538882485421103, 0.0922275923541747, 0.13828600987132328, 0.17275332410936245, -0.07984724642107419, -0.27316818698309364, 0.02883112666507562, -0.09810754898935556, -0.18669802667961147, 0.004154693017092844, 0.022950917870427173, 0.08415354533353821, -0.19340037029857438, 0.08358654477633536, 0.08236436671965446, 0.051189789727201666, -0.11723692912006906, -0.03349197471009878, -0.07945959506129535, 0.09024813021145141, 0.019034775763672466, -6.647229893133044e-05, 0.1760362823183338, -0.13153689934212404, -0.07172590422754486, 0.4221317872482662, -0.1335680462949919, -0.09676109313343963, 0.13469887904939243, -0.19095636143756564, -1.819462171018434e-05, 0.18974395534023641, 0.14943586826896837, 0.1033212763722986, -0.05127267779413766, 0.014519143095822074, 0.03733975130598992, 0.1812534590717405, 0.16282209114093954, 0.11308286020842691, 0.23988318828633054, 0.18408940845013907, 0.04743669950403273, 0.14099805585477346, -0.10428129240171984, -0.05583148019310708, -0.29814427139547967, -0.12041396429607024, -0.173540208748697, 0.021607124782167374, -0.09826946872805517, -0.1638180937540407, 0.4333043811066697, 0.09021451620695492, 0.17335330778053806, -0.022039366078873475, 0.3360100919691225, 0.17153075677827775, 0.08673251043461884, 0.00613331615847225, 0.34536719679211575, 0.14390807335148564, 0.11006344376558748, -0.31225385994572813, -0.04406016820576042, 0.02724486825269802]
|
707.1599
|
Involutions on 3-Manifolds and Self-dual, Binary Codes
|
We study a correspondence between orientation reversing involutions on
compact 3-manifolds with only isolated fixed points and binary, self-dual
codes. We show in particular that every such code can be obtained from such an
involution. We further relate doubly even codes to Pin^- -structures and
Spin-manifolds.
|
math.AT
|
we study a correspondence between orientation reversing involutions on compact 3manifolds with only isolated fixed points and binary selfdual codes we show in particular that every such code can be obtained from such an involution we further relate doubly even codes to pin structures and spinmanifolds
|
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|
[-0.20360019183515207, 0.10316282698318979, -0.06763925751590211, 0.09230874495013901, -0.048854925917744964, -0.20516295174298727, 0.031045739660444466, 0.4629657068087355, -0.32912027759416757, -0.24103419146622004, 0.09886670003027614, -0.3103537520636683, -0.1863826230426481, 0.2179890330273496, -0.11873528049529894, -0.001857313448968141, 0.11584659613183011, 0.06573355432761752, -0.17780517887971972, -0.25433187988465245, 0.3856560537672561, 0.014484338178906752, 0.1657216079361008, 0.02442678001344852, 0.08049172762295474, 0.02729086262052474, -0.0004484208437371189, 0.057452013614870935, -0.15040066051274745, 0.049553837465203324, 0.26894478046375775, 0.07280619672256643, 0.06489463263879651, -0.38704376113689604, -0.16648019899857108, 0.17676100968990638, 0.13695177178748924, 0.14162004896966013, -0.08348197808094404, -0.2444848562109932, 0.1799736943743799, -0.14936762076357138, -0.1078189765913007, -0.05447013070806861, 0.020447021664079766, 0.04451346500655231, -0.23007670850695475, -0.09616126201075056, 0.11670700974924408, 0.11381228081882, -0.0800170221608942, -0.08141011754860697, -0.08421271130361635, 0.16001118807648512, -0.00812636548653245, 0.07724062603918593, 0.026824430196859834, -0.05004166880541522, -0.17498386455902262, 0.3238394128401642, -0.042221170242713844, -0.2642008085613665, 0.17538713307484335, -0.14882171534649705, -0.18776714031422592, 0.07607292068069396, 0.1762923375784379, 0.18413845678467466, -0.035934918438610824, 0.12400234421543048, -0.13057222661724233, 0.1903514893239607, 0.16071408011181199, -0.014019075872214593, 0.24242417263272015, 0.0520685663720107, 0.07271437037169286, 0.16354637332614916, -0.02511755232800446, -0.009803438214990108, -0.31775632203030196, -0.16610770409866032, -0.109753900187333, 0.14296978777881875, -0.10961061732213358, -0.1702588763816849, 0.3372902373742798, 0.0776221748623673, 0.19464369713450255, 0.07292336600063287, 0.17621559258955327, 0.007391082158352694, 0.10050597321242094, 0.16777882326151367, 0.10125258621638236, 0.16049327963517737, -0.13097551416443742, -0.16648430750280133, -0.03678689091263906, 0.1197140354298703]
|
707.16
|
Parameter Estimation in Manneville-Pomeau Processes
|
In this work we study a class of stochastic processes $\{X_t\}_{t\in\N}$,
where $X_t = (\phi \circ T_s^t)(X_0)$ is obtained from the iterations of the
transformation T_s, invariant for an ergodic probability \mu_s on [0,1] and a
continuous by part function $\phi:[0,1] \to \R$. We consider here $T_s:[0,1]\to
[0,1]$ the Manneville-Pomeau transformation. The autocorrelation function of
the resulting process decays hyperbolically (or polynomially) and we obtain
efficient methods to estimate the parameter s from a finite time series. As a
consequence we also estimate the rate of convergence of the autocorrelation
decay of these processes. We compare different estimation methods based on the
periodogram function, on the smoothed periodogram function, on the variance of
the partial sum and on the wavelet theory.
|
math.ST math.DS stat.TH
|
in this work we study a class of stochastic processes x_t_tinn where x_t phi circ t_stx_0 is obtained from the iterations of the transformation t_s invariant for an ergodic probability mu_s on 01 and a continuous by part function phi01 to r we consider here t_s01to 01 the mannevillepomeau transformation the autocorrelation function of the resulting process decays hyperbolically or polynomially and we obtain efficient methods to estimate the parameter s from a finite time series as a consequence we also estimate the rate of convergence of the autocorrelation decay of these processes we compare different estimation methods based on the periodogram function on the smoothed periodogram function on the variance of the partial sum and on the wavelet theory
|
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|
[-0.08380805585995062, 0.0953182893633319, -0.12542771120181578, 0.07599454311588115, -0.003299881142970079, -0.05418054282697093, 0.07654544771907644, 0.3584302939060662, -0.33261393149916685, -0.20078251401806235, 0.13066303370914495, -0.29460251789826614, -0.1447731902749222, 0.1991849776604173, -0.009878384661820963, 0.1038129940851886, 0.019418289228223074, 0.0479349596823892, -0.12866306777756947, -0.2135750680592739, 0.2967051302687798, 0.02034253653827418, 0.21509681047043866, -0.007206615597869341, 0.1337889092297763, 0.030859269050515104, -0.07112177155720882, -0.03765342809641973, -0.20874294265706697, 0.05427522955334976, 0.15112487379557046, 0.14091559877205226, 0.2898830991620437, -0.33880781767587376, -0.16477221459882635, 0.1416816082982044, 0.13907249189856558, 0.007258604869692244, -0.01479863689149706, -0.26525551072743714, 0.08173430393625082, -0.1389658375022312, -0.06646094353805877, -0.05668566163438253, 0.03859016367703931, 0.06263699182946011, -0.3490634259138989, 0.12365073562020379, 0.06823431625643857, 0.052630393026579715, -0.03507421091875523, -0.13364162283320713, 0.01934193612402703, 0.0704225372009648, 0.08781236658369303, 0.05945912173563121, 0.1415160139823635, -0.06002818105909496, -0.07642328828318506, 0.3178867971938517, -0.1494898287873938, -0.235250368141211, 0.14698756348270064, -0.17968740882988796, -0.14719930255355743, 0.12226097789616922, 0.2186939569650831, 0.18440830740982142, -0.11996476508231245, 0.12085088064474189, -0.019966329183254358, 0.16561632791661426, 0.03201601806327573, 0.01517374145710825, 0.12095314552450281, 0.11759933890792508, 0.11758744159492497, 0.15512986154828826, -0.09638692887746689, -0.0675303854732814, -0.346483735829337, -0.16286370298291883, -0.20860656595621735, 0.07777443559816441, -0.11748955560672499, -0.18908705416684732, 0.41471063565367305, 0.11456161070193172, 0.22682955391052315, 0.14640870941086456, 0.27698139539068073, 0.21664586403649938, -0.004665788872024188, 0.03018464921360724, 0.14245977744054145, 0.1380974079350917, 0.05486693457326191, -0.22479976127799758, 0.06174195848771522, 0.11090200636177681]
|
707.1601
|
Measurement of Prominent eta Decay Branching Fractions
|
The decay psi(2S) --> eta J/psi is used to measure, for the first time, all
prominent eta-meson branching fractions with the same experiment in the same
dataset, thereby providing a consistent treatment of systematics across
branching fractions. We present results for eta decays to gamma gamma,
pi+pi-pi0, 3 pi0, pi+ pi- gamma, and e+ e- gamma, accounting for 99.9% of all
eta decays. The precisions for several of the branching fractions and their
ratios are improved. Two channels, pi+ pi- gamma and e+ e- gamma, show results
that differ at the level of three standard deviations from those previously
determined.
|
hep-ex
|
the decay psi2s eta jpsi is used to measure for the first time all prominent etameson branching fractions with the same experiment in the same dataset thereby providing a consistent treatment of systematics across branching fractions we present results for eta decays to gamma gamma pipipi0 3 pi0 pi pi gamma and e e gamma accounting for 999 of all eta decays the precisions for several of the branching fractions and their ratios are improved two channels pi pi gamma and e e gamma show results that differ at the level of three standard deviations from those previously determined
|
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|
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|
707.1602
|
A 1.4-GHz Arecibo Survey for Pulsars in Globular Clusters
|
We have surveyed all 22 known Galactic globular clusters observable with the
Arecibo radio telescope and within 70kpc of the Sun for radio pulsations at
~1.4GHz. Data were taken with the Wideband Arecibo Pulsar Processor, which
provided the large bandwidth and high time and frequency resolution needed to
detect fast-spinning, faint pulsars. We have also employed advanced search
techniques to maintain sensitivity to short orbital period binaries. These
searches have discovered 11 new millisecond pulsars and 2 promising candidates
in 5 clusters, almost doubling the population of pulsars in the Arecibo-visible
globular clusters. Ten of these new pulsars are in binary systems, and 3 are
eclipsing. This survey has discovered significantly more very fast-spinning
pulsars (P_spin <~ 4ms) and short orbital period systems (P_orb <~ 6hr) than
previous surveys of the same clusters. We discuss some properties of these
systems, as well as some characteristics of the globular cluster pulsar
population in general, particularly its luminosity distribution.
|
astro-ph
|
we have surveyed all 22 known galactic globular clusters observable with the arecibo radio telescope and within 70kpc of the sun for radio pulsations at 14ghz data were taken with the wideband arecibo pulsar processor which provided the large bandwidth and high time and frequency resolution needed to detect fastspinning faint pulsars we have also employed advanced search techniques to maintain sensitivity to short orbital period binaries these searches have discovered 11 new millisecond pulsars and 2 promising candidates in 5 clusters almost doubling the population of pulsars in the arecibovisible globular clusters ten of these new pulsars are in binary systems and 3 are eclipsing this survey has discovered significantly more very fastspinning pulsars p_spin 4ms and short orbital period systems p_orb 6hr than previous surveys of the same clusters we discuss some properties of these systems as well as some characteristics of the globular cluster pulsar population in general particularly its luminosity distribution
|
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|
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|
707.1603
|
A simple formula for the conserved charges of soliton theories
|
We present a simple formula for all the conserved charges of soliton
theories, evaluated on the solutions belonging to the orbit of the vacuum under
the group of dressing transformations. For pedagogical reasons we perform the
explicit calculations for the case of the sine-Gordon model, taken as a
prototype of soliton theories. We show that the energy and momentum are
boundary terms for all the solutions on the orbit of the vacuum. That orbit
includes practically all the solutions of physical interest, namely solitons,
multi-solitons, breathers, and combinations of solitons and breathers. The
example of the mKdV equation is also given explicitly.
|
hep-th math-ph math.MP nlin.SI
|
we present a simple formula for all the conserved charges of soliton theories evaluated on the solutions belonging to the orbit of the vacuum under the group of dressing transformations for pedagogical reasons we perform the explicit calculations for the case of the sinegordon model taken as a prototype of soliton theories we show that the energy and momentum are boundary terms for all the solutions on the orbit of the vacuum that orbit includes practically all the solutions of physical interest namely solitons multisolitons breathers and combinations of solitons and breathers the example of the mkdv equation is also given explicitly
|
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|
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|
707.1604
|
Light Quasiparticles Dominate Electronic Transport in Molecular Crystal
Field-Effect Transistors
|
We report on an infrared spectroscopy study of mobile holes in the
accumulation layer of organic field-effect transistors based on rubrene single
crystals. Our data indicate that both transport and infrared properties of
these transistors at room temperature are governed by light quasiparticles in
molecular orbital bands with the effective masses m* comparable to free
electron mass. Furthermore, the m* values inferred from our experiments are in
agreement with those determined from band structure calculations. These
findings reveal no evidence for prominent polaronic effects, which is at
variance with the common beliefs of polaron formation in molecular solids.
|
cond-mat.mtrl-sci cond-mat.soft
|
we report on an infrared spectroscopy study of mobile holes in the accumulation layer of organic fieldeffect transistors based on rubrene single crystals our data indicate that both transport and infrared properties of these transistors at room temperature are governed by light quasiparticles in molecular orbital bands with the effective masses m comparable to free electron mass furthermore the m values inferred from our experiments are in agreement with those determined from band structure calculations these findings reveal no evidence for prominent polaronic effects which is at variance with the common beliefs of polaron formation in molecular solids
|
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|
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|
707.1605
|
Secant dimensions of low-dimensional homogeneous varieties
|
We completely describe the higher secant dimensions of all connected
homogeneous projective varieties of dimension at most 3, in all possible
equivariant embeddings. In particular, we calculate these dimensions for all
Segre-Veronese embeddings of P^1 * P^1, P^1 * P^1 * P^1, and P^2 * P^1, as well
as for the variety F of incident point-line pairs in P^2. For P^2 * P^1 and F
the results are new, while the proofs for the other two varieties are more
compact than existing proofs. Our main tool is the second author's tropical
approach to secant dimensions.
|
math.AG math.RT
|
we completely describe the higher secant dimensions of all connected homogeneous projective varieties of dimension at most 3 in all possible equivariant embeddings in particular we calculate these dimensions for all segreveronese embeddings of p1 p1 p1 p1 p1 and p2 p1 as well as for the variety f of incident pointline pairs in p2 for p2 p1 and f the results are new while the proofs for the other two varieties are more compact than existing proofs our main tool is the second authors tropical approach to secant dimensions
|
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|
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|
707.1606
|
Exchangeable partitions derived from Markovian coalescents with
simultaneous multiple collisions
|
Kingman derived the Ewens sampling formula for random partitions from the
genealogy model defined by a Poisson process of mutations along lines of
descent governed by a simple coalescent process. M\"ohle described the
recursion which determines the generalization of the Ewens sampling formula
when the lines of descent are governed by a coalescent with multiple
collisions. In a recent work by Dong, Gnedin and Pitman, authors exploit an
analogy with the theory of regenerative composition and partition structures,
and provide various characterizations of the associated exchangeable random
partitions. This paper gives parallel results for the further generalized model
with lines of descent following a coalescent with simultaneous multiple
collisions.
|
math.PR
|
kingman derived the ewens sampling formula for random partitions from the genealogy model defined by a poisson process of mutations along lines of descent governed by a simple coalescent process mohle described the recursion which determines the generalization of the ewens sampling formula when the lines of descent are governed by a coalescent with multiple collisions in a recent work by dong gnedin and pitman authors exploit an analogy with the theory of regenerative composition and partition structures and provide various characterizations of the associated exchangeable random partitions this paper gives parallel results for the further generalized model with lines of descent following a coalescent with simultaneous multiple collisions
|
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|
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|
707.1607
|
Cactus Framework: Black Holes to Gamma Ray Bursts
|
Gamma Ray Bursts (GRBs) are intense narrowly-beamed flashes of gamma-rays of
cosmological origin. They are among the most scientifically interesting
astrophysical systems, and the riddle concerning their central engines and
emission mechanisms is one of the most complex and challenging problems of
astrophysics today. In this article we outline our petascale approach to the
GRB problem and discuss the computational toolkits and numerical codes that are
currently in use and that will be scaled up to run on emerging petaflop scale
computing platforms in the near future.
Petascale computing will require additional ingredients over conventional
parallelism. We consider some of the challenges which will be caused by future
petascale architectures, and discuss our plans for the future development of
the Cactus framework and its applications to meet these challenges in order to
profit from these new architectures.
|
cs.DC
|
gamma ray bursts grbs are intense narrowlybeamed flashes of gammarays of cosmological origin they are among the most scientifically interesting astrophysical systems and the riddle concerning their central engines and emission mechanisms is one of the most complex and challenging problems of astrophysics today in this article we outline our petascale approach to the grb problem and discuss the computational toolkits and numerical codes that are currently in use and that will be scaled up to run on emerging petaflop scale computing platforms in the near future petascale computing will require additional ingredients over conventional parallelism we consider some of the challenges which will be caused by future petascale architectures and discuss our plans for the future development of the cactus framework and its applications to meet these challenges in order to profit from these new architectures
|
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|
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|
707.1608
|
Dimensional dependence of naked singularity formation in spherical
gravitational collapse
|
The complete spectrum of the endstates - naked singularities, or blackholes -
of gravitational collapse is analyzed for a wide class of $N$-dimensional
spacetimes in spherical symmetry, which includes and generalizes the dust
solutions and the case of vanishing radial stresses. The final fate of the
collapse is shown to be fully determined by the local behavior of a single
scalar function and by the dimension $N$ of the spacetime. In particular, the
``critical'' behavior of the N=4 spacetimes, where a sort of phase transition
from black hole to naked singularity can occur, is still present if N=5 but
does not occur if $N > 5$, independently from the initial data of the collapse.
Physically, the results turn out to be related to the kinematical properties of
the considered solutions.
|
gr-qc
|
the complete spectrum of the endstates naked singularities or blackholes of gravitational collapse is analyzed for a wide class of ndimensional spacetimes in spherical symmetry which includes and generalizes the dust solutions and the case of vanishing radial stresses the final fate of the collapse is shown to be fully determined by the local behavior of a single scalar function and by the dimension n of the spacetime in particular the critical behavior of the n4 spacetimes where a sort of phase transition from black hole to naked singularity can occur is still present if n5 but does not occur if n 5 independently from the initial data of the collapse physically the results turn out to be related to the kinematical properties of the considered solutions
|
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|
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|
707.1609
|
Equivariant monads and equivariant lifts versus a 2-category of
distributive laws
|
Fix a monoidal category C. The 2-category of monads in the 2-category of
C-actegories, colax C-equivarant functors, and C-equivariant natural
transformations of colax functors, may be recast in terms of pairs consisting
of a usual monad and a distributive law between the monad and the action of C,
morphisms of monads respecting the distributive law, and transformations of
monads satisfying some compatibility with the actions and distributive laws
involved. The monads in this picture may be generalized to actions of monoidal
categories, and actions of PRO-s in particular. If C is a PRO as well, then in
special cases one gets various distributive laws of a given classical type, for
example between a comonad and an endofunctor or between a monad and a comonad.
The usual pentagons are in general replaced by multigons, and there are also
``mixed'' multigons involving two distinct distributive laws. Beck's bijection
between the distributive laws and lifts of one monad to the Eilenberg-Moore
category of another monad is here extended to an isomorphism of 2-categories.
The lifts of maps of above mentioned pairs are colax C-equivariant. We finish
with a short treatment of relative distributive laws between two pseudoalgebra
structures which are relative with respect to the distributivity of two
pseudomonads involved, what gives a hint toward the generalizations.
|
math.CT
|
fix a monoidal category c the 2category of monads in the 2category of cactegories colax cequivarant functors and cequivariant natural transformations of colax functors may be recast in terms of pairs consisting of a usual monad and a distributive law between the monad and the action of c morphisms of monads respecting the distributive law and transformations of monads satisfying some compatibility with the actions and distributive laws involved the monads in this picture may be generalized to actions of monoidal categories and actions of pros in particular if c is a pro as well then in special cases one gets various distributive laws of a given classical type for example between a comonad and an endofunctor or between a monad and a comonad the usual pentagons are in general replaced by multigons and there are also mixed multigons involving two distinct distributive laws becks bijection between the distributive laws and lifts of one monad to the eilenbergmoore category of another monad is here extended to an isomorphism of 2categories the lifts of maps of above mentioned pairs are colax cequivariant we finish with a short treatment of relative distributive laws between two pseudoalgebra structures which are relative with respect to the distributivity of two pseudomonads involved what gives a hint toward the generalizations
|
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|
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|
707.161
|
How a Vicinal Layer of Solvent Modulates the Dynamics of Proteins
|
The dynamics of a folded protein is studied in water and glycerol at a series
of temperatures below and above their respective dynamical transition. The
system is modeled in two distinct states whereby the protein is decoupled from
the bulk solvent at low temperatures, and communicates with it through a
vicinal layer at physiological temperatures. A linear viscoelastic model
elucidates the less-than-expected increase in the relaxation times observed in
the backbone dynamics of the protein. The model further explains the increase
in the flexibility of the protein once the transition takes place and the
differences in the flexibility under the different solvent environments.
Coupling between the vicinal layer and the protein fluctuations is necessary to
interpret these observations. The vicinal layer is postulated to form once a
threshold for the volumetric fluctuations in the protein to accommodate
solvents of different sizes is reached. Compensation of entropic-energetic
contributions from the protein-coupled vicinal layer quantifies the scaling of
the dynamical transition temperatures in various solvents. The protein adapts
different conformational routes for organizing the required coupling to a
specific solvent, which is achieved by adjusting the amount of conformational
jumps in the surface-group dihedrals.
|
cond-mat.soft
|
the dynamics of a folded protein is studied in water and glycerol at a series of temperatures below and above their respective dynamical transition the system is modeled in two distinct states whereby the protein is decoupled from the bulk solvent at low temperatures and communicates with it through a vicinal layer at physiological temperatures a linear viscoelastic model elucidates the lessthanexpected increase in the relaxation times observed in the backbone dynamics of the protein the model further explains the increase in the flexibility of the protein once the transition takes place and the differences in the flexibility under the different solvent environments coupling between the vicinal layer and the protein fluctuations is necessary to interpret these observations the vicinal layer is postulated to form once a threshold for the volumetric fluctuations in the protein to accommodate solvents of different sizes is reached compensation of entropicenergetic contributions from the proteincoupled vicinal layer quantifies the scaling of the dynamical transition temperatures in various solvents the protein adapts different conformational routes for organizing the required coupling to a specific solvent which is achieved by adjusting the amount of conformational jumps in the surfacegroup dihedrals
|
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|
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|
707.1611
|
Probabilistic Cross-Identification of Astronomical Sources
|
We present a general probabilistic formalism for cross-identifying
astronomical point sources in multiple observations. Our Bayesian approach,
symmetric in all observations, is the foundation of a unified framework for
object matching, where not only spatial information, but physical properties,
such as colors, redshift and luminosity, can also be considered in a natural
way. We provide a practical recipe to implement an efficient recursive
algorithm to evaluate the Bayes factor over a set of catalogs with known
circular errors in positions. This new methodology is crucial for studies
leveraging the synergy of today's multi-wavelength observations and to enter
the time-domain science of the upcoming survey telescopes.
|
astro-ph
|
we present a general probabilistic formalism for crossidentifying astronomical point sources in multiple observations our bayesian approach symmetric in all observations is the foundation of a unified framework for object matching where not only spatial information but physical properties such as colors redshift and luminosity can also be considered in a natural way we provide a practical recipe to implement an efficient recursive algorithm to evaluate the bayes factor over a set of catalogs with known circular errors in positions this new methodology is crucial for studies leveraging the synergy of todays multiwavelength observations and to enter the timedomain science of the upcoming survey telescopes
|
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|
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|
707.1612
|
Accretion disc coronae in black hole binaries
|
Most of the luminosity of accreting black hole is emitted in the X-ray band.
This radiation is believed to emerge, through inverse Compton process, from a
hot (Te ~ 10^8 -10^9 K) optically thin (Thomson optical depth ~ 1) plasma
probably located in the immediate vicinity of the black hole. The mechanisms at
work in this so called Compton corona can be unveiled through hard X-ray
observations which have revealed a rich phenomenology. Depending on luminosity
different spectral states are observed suggesting that the nature and geometry
of the corona depends on mass accretion rate. In many instances the spectral
behaviour as a function of luminosity shows some degree of hysteresis. The
mechanisms triggering the transition between spectral states is very unclear
although it could be related to an evaporation/condensation equilibrium in an
accretion disc corona system. From the observation of correlation between the
X-ray and radio band, it appears that the Compton corona is intimately related
to the formation of compact jets and probably constitutes the base of the jet.
|
astro-ph
|
most of the luminosity of accreting black hole is emitted in the xray band this radiation is believed to emerge through inverse compton process from a hot te 108 109 k optically thin thomson optical depth 1 plasma probably located in the immediate vicinity of the black hole the mechanisms at work in this so called compton corona can be unveiled through hard xray observations which have revealed a rich phenomenology depending on luminosity different spectral states are observed suggesting that the nature and geometry of the corona depends on mass accretion rate in many instances the spectral behaviour as a function of luminosity shows some degree of hysteresis the mechanisms triggering the transition between spectral states is very unclear although it could be related to an evaporationcondensation equilibrium in an accretion disc corona system from the observation of correlation between the xray and radio band it appears that the compton corona is intimately related to the formation of compact jets and probably constitutes the base of the jet
|
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|
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|
707.1613
|
Morphologies of AGN host galaxies using HST/ACS in the CDFS-GOODS field
|
Using HST/ACS images in four bands F435W, F606W, F775W and F850LP, we
identify optical counterparts to the X-ray sources in the Chandra Deep Field
South in the GOODS South field. A detailed study has been made of these sources
to study their morphological types. We use methods like decomposition of galaxy
luminosity profiles, color maps and visual inspection of 192 galaxies which are
identified as possible optical counterparts of Chandra X-ray sources in the
CDFS-GOODS field. We find that most moderate luminosity AGN hosts are bulge
dominated in the redshift range (z \approx 0.4-1.3), but not
merging/interacting galaxies. This implies probable fueling of the moderate
luminosity AGN by mechanisms other than those merger driven.
|
astro-ph
|
using hstacs images in four bands f435w f606w f775w and f850lp we identify optical counterparts to the xray sources in the chandra deep field south in the goods south field a detailed study has been made of these sources to study their morphological types we use methods like decomposition of galaxy luminosity profiles color maps and visual inspection of 192 galaxies which are identified as possible optical counterparts of chandra xray sources in the cdfsgoods field we find that most moderate luminosity agn hosts are bulge dominated in the redshift range z approx 0413 but not merginginteracting galaxies this implies probable fueling of the moderate luminosity agn by mechanisms other than those merger driven
|
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|
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|
707.1614
|
Analysis of the accuracy and convergence of equation-free projection to
a slow manifold
|
In [C.W. Gear, T.J. Kaper, I.G. Kevrekidis, and A. Zagaris, Projecting to a
Slow Manifold: Singularly Perturbed Systems and Legacy Codes, SIAM J. Appl.
Dyn. Syst. 4 (2005) 711-732], we developed a class of iterative algorithms
within the context of equation-free methods to approximate low-dimensional,
attracting, slow manifolds in systems of differential equations with multiple
time scales. For user-specified values of a finite number of the observables,
the m-th member of the class of algorithms (m = 0, 1, ...) finds iteratively an
approximation of the appropriate zero of the (m+1)-st time derivative of the
remaining variables and uses this root to approximate the location of the point
on the slow manifold corresponding to these values of the observables. This
article is the first of two articles in which the accuracy and convergence of
the iterative algorithms are analyzed. Here, we work directly with explicit
fast--slow systems, in which there is an explicit small parameter, epsilon,
measuring the separation of time scales. We show that, for each m = 0, 1, ...,
the fixed point of the iterative algorithm approximates the slow manifold up to
and including terms of O(epsilon^m). Moreover, for each m, we identify
explicitly the conditions under which the m-th iterative algorithm converges to
this fixed point. Finally, we show that when the iteration is unstable (or
converges slowly) it may be stabilized (or its convergence may be accelerated)
by application of the Recursive Projection Method. Alternatively, the
Newton-Krylov Generalized Minimal Residual Method may be used. In the
subsequent article, we will consider the accuracy and convergence of the
iterative algorithms for a broader class of systems-in which there need not be
an explicit small parameter-to which the algorithms also apply.
|
math.DS math.NA
|
in cw gear tj kaper ig kevrekidis and a zagaris projecting to a slow manifold singularly perturbed systems and legacy codes siam j appl dyn syst 4 2005 711732 we developed a class of iterative algorithms within the context of equationfree methods to approximate lowdimensional attracting slow manifolds in systems of differential equations with multiple time scales for userspecified values of a finite number of the observables the mth member of the class of algorithms m 0 1 finds iteratively an approximation of the appropriate zero of the m1st time derivative of the remaining variables and uses this root to approximate the location of the point on the slow manifold corresponding to these values of the observables this article is the first of two articles in which the accuracy and convergence of the iterative algorithms are analyzed here we work directly with explicit fastslow systems in which there is an explicit small parameter epsilon measuring the separation of time scales we show that for each m 0 1 the fixed point of the iterative algorithm approximates the slow manifold up to and including terms of oepsilonm moreover for each m we identify explicitly the conditions under which the mth iterative algorithm converges to this fixed point finally we show that when the iteration is unstable or converges slowly it may be stabilized or its convergence may be accelerated by application of the recursive projection method alternatively the newtonkrylov generalized minimal residual method may be used in the subsequent article we will consider the accuracy and convergence of the iterative algorithms for a broader class of systemsin which there need not be an explicit small parameterto which the algorithms also apply
|
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|
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|
707.1615
|
Random-phase-approximation-based correlation energy functionals:
Benchmark results for atoms
|
The random phase approximation (RPA) for the correlation energy functional of
density functional theory has recently attracted renewed interest. Formulated
in terms of the Kohn-Sham (KS) orbitals and eigenvalues, it promises to resolve
some of the fundamental limitations of the local density and generalized
gradient approximations, as for instance their inability to account for
dispersion forces. First results for atoms, however, indicate that the RPA
overestimates correlation effects as much as the orbital-dependent functional
obtained by a second order perturbation expansion on the basis of the KS
Hamiltonian. In this contribution, three simple extensions of the RPA are
examined, (a) its augmentation by an LDA for short-range correlation, (b) its
combination with the second order exchange term, and (c) its combination with a
partial resummation of the perturbation series including the second order
exchange. It is found that the ground state and correlation energies as well as
the ionization potentials resulting from the extensions (a) and (c) for closed
sub-shell atoms are clearly superior to those obtained with the unmodified RPA.
Quite some effort is made to ensure highly converged RPA data, so that the
results may serve as benchmark data. The numerical techniques developed in this
context, in particular for the inherent frequency integration, should also be
useful for applications of RPA-type functionals to more complex systems.
|
cond-mat.other
|
the random phase approximation rpa for the correlation energy functional of density functional theory has recently attracted renewed interest formulated in terms of the kohnsham ks orbitals and eigenvalues it promises to resolve some of the fundamental limitations of the local density and generalized gradient approximations as for instance their inability to account for dispersion forces first results for atoms however indicate that the rpa overestimates correlation effects as much as the orbitaldependent functional obtained by a second order perturbation expansion on the basis of the ks hamiltonian in this contribution three simple extensions of the rpa are examined a its augmentation by an lda for shortrange correlation b its combination with the second order exchange term and c its combination with a partial resummation of the perturbation series including the second order exchange it is found that the ground state and correlation energies as well as the ionization potentials resulting from the extensions a and c for closed subshell atoms are clearly superior to those obtained with the unmodified rpa quite some effort is made to ensure highly converged rpa data so that the results may serve as benchmark data the numerical techniques developed in this context in particular for the inherent frequency integration should also be useful for applications of rpatype functionals to more complex systems
|
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|
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|
707.1616
|
Modularity and community detection in bipartite networks
|
The modularity of a network quantifies the extent, relative to a null model
network, to which vertices cluster into community groups. We define a null
model appropriate for bipartite networks, and use it to define a bipartite
modularity. The bipartite modularity is presented in terms of a modularity
matrix B; some key properties of the eigenspectrum of B are identified and used
to describe an algorithm for identifying modules in bipartite networks. The
algorithm is based on the idea that the modules in the two parts of the network
are dependent, with each part mutually being used to induce the vertices for
the other part into the modules. We apply the algorithm to real-world network
data, showing that the algorithm successfully identifies the modular structure
of bipartite networks.
|
physics.data-an cond-mat.stat-mech physics.soc-ph
|
the modularity of a network quantifies the extent relative to a null model network to which vertices cluster into community groups we define a null model appropriate for bipartite networks and use it to define a bipartite modularity the bipartite modularity is presented in terms of a modularity matrix b some key properties of the eigenspectrum of b are identified and used to describe an algorithm for identifying modules in bipartite networks the algorithm is based on the idea that the modules in the two parts of the network are dependent with each part mutually being used to induce the vertices for the other part into the modules we apply the algorithm to realworld network data showing that the algorithm successfully identifies the modular structure of bipartite networks
|
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|
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|
707.1617
|
Computation of the cover of Shimura curves $X_0(2) \to X(1)$ for the
cyclic cubic field of discriminant 13^2
|
We compute the canonical model of the cover of Shimura curves $X_0(2) \to
X(1)$ for the cubic field of discriminant 13^2 described at the end of Elkies'
paper "Shimura curves for level 3 subgroups of the (2,3,7) triangle group".
Last, we list the coordinates of some rational CM points on X(1).
|
math.NT math.AG
|
we compute the canonical model of the cover of shimura curves x_02 to x1 for the cubic field of discriminant 132 described at the end of elkies paper shimura curves for level 3 subgroups of the 237 triangle group last we list the coordinates of some rational cm points on x1
|
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|
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|
707.1618
|
The Trade-offs with Space Time Cube Representation of Spatiotemporal
Patterns
|
Space time cube representation is an information visualization technique
where spatiotemporal data points are mapped into a cube. Fast and correct
analysis of such information is important in for instance geospatial and social
visualization applications. Information visualization researchers have
previously argued that space time cube representation is beneficial in
revealing complex spatiotemporal patterns in a dataset to users. The argument
is based on the fact that both time and spatial information are displayed
simultaneously to users, an effect difficult to achieve in other
representations. However, to our knowledge the actual usefulness of space time
cube representation in conveying complex spatiotemporal patterns to users has
not been empirically validated. To fill this gap we report on a
between-subjects experiment comparing novice users error rates and response
times when answering a set of questions using either space time cube or a
baseline 2D representation. For some simple questions the error rates were
lower when using the baseline representation. For complex questions where the
participants needed an overall understanding of the spatiotemporal structure of
the dataset, the space time cube representation resulted in on average twice as
fast response times with no difference in error rates compared to the baseline.
These results provide an empirical foundation for the hypothesis that space
time cube representation benefits users when analyzing complex spatiotemporal
patterns.
|
cs.HC cs.GR
|
space time cube representation is an information visualization technique where spatiotemporal data points are mapped into a cube fast and correct analysis of such information is important in for instance geospatial and social visualization applications information visualization researchers have previously argued that space time cube representation is beneficial in revealing complex spatiotemporal patterns in a dataset to users the argument is based on the fact that both time and spatial information are displayed simultaneously to users an effect difficult to achieve in other representations however to our knowledge the actual usefulness of space time cube representation in conveying complex spatiotemporal patterns to users has not been empirically validated to fill this gap we report on a betweensubjects experiment comparing novice users error rates and response times when answering a set of questions using either space time cube or a baseline 2d representation for some simple questions the error rates were lower when using the baseline representation for complex questions where the participants needed an overall understanding of the spatiotemporal structure of the dataset the space time cube representation resulted in on average twice as fast response times with no difference in error rates compared to the baseline these results provide an empirical foundation for the hypothesis that space time cube representation benefits users when analyzing complex spatiotemporal patterns
|
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|
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|
707.1619
|
An Extremely Bright Echo Associated With SN 2002hh
|
We present new, very late-time optical photometry and spectroscopy of the
interesting Type II-P supernova, SN 2002hh, in NGC 6946. Gemini/GMOS-N has been
used to acquire visible spectra at six epochs between 2004 August and 2006
July, following the evolution of the SN from age 661 to 1358 days. Few optical
spectra of Type II supernovae with ages greater than one year exist. In
addition, g'r'i' images were acquired at all six epochs. The spectral and
photometric evolution of SN 2002hh has been very unusual. Measures of the
brightness of this SN, both in the R and I bands as well as in the H-alpha
emission flux, show no significant fading over an interval of nearly two years.
The most straightforward explanation for this behavior is that the light being
measured comes not only from the SN itself but also from an echo off of nearby
dust. Echoes have been detected previously around several SNe but these echoes,
at their brightest, were ~8 mag below the maximum brightness of the SN. At V~21
mag, the putative echo dominates the light of SN 2002hh and is only ~4 mag
below the outburst's peak brightness. There is an estimated 6 magnitudes of
total extinction in V towards SN 2002hh. The proposed explanation of a
differential echo/SN absorption is inconsistent with the observed BVRI colors.
|
astro-ph
|
we present new very latetime optical photometry and spectroscopy of the interesting type iip supernova sn 2002hh in ngc 6946 geminigmosn has been used to acquire visible spectra at six epochs between 2004 august and 2006 july following the evolution of the sn from age 661 to 1358 days few optical spectra of type ii supernovae with ages greater than one year exist in addition gri images were acquired at all six epochs the spectral and photometric evolution of sn 2002hh has been very unusual measures of the brightness of this sn both in the r and i bands as well as in the halpha emission flux show no significant fading over an interval of nearly two years the most straightforward explanation for this behavior is that the light being measured comes not only from the sn itself but also from an echo off of nearby dust echoes have been detected previously around several sne but these echoes at their brightest were 8 mag below the maximum brightness of the sn at v21 mag the putative echo dominates the light of sn 2002hh and is only 4 mag below the outbursts peak brightness there is an estimated 6 magnitudes of total extinction in v towards sn 2002hh the proposed explanation of a differential echosn absorption is inconsistent with the observed bvri colors
|
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|
[-0.02314330277357638, 0.06579224599046765, -0.08907429929569835, 0.07711905594261961, -0.06818859530949957, -0.15290251999486493, 0.037248322760214295, 0.4837749131377871, -0.15946589896088778, -0.3355193001121215, 0.09557205313454252, -0.3620692005452628, -0.04121474115961817, 0.21450789049752395, -0.08358847193617767, -0.0782688789915639, 0.08572295580135145, -0.05488899550758875, -0.080671271535766, -0.3241816133005772, 0.2197599963251316, 0.03316758195785342, 0.18546565785968247, -0.02820018917001885, 0.07440119768320098, -0.0799516588934103, -0.07865600549005924, -0.0665428367194749, -0.11539283719844722, 0.007374091990443781, 0.200383452166357, 0.14511083834383182, 0.17540248872172845, -0.33190689716968536, -0.2293165081198542, 0.11592034369336264, 0.1906097164030958, 0.03192398185963949, -0.006270435553389639, -0.26069852255908477, 0.032640699901917265, -0.16208124955129974, -0.1570071489149831, 0.12035740961581974, 0.12025400779022502, -0.0008345884871479478, -0.1654990738556969, 0.14528480157078605, -0.015514171791865546, 0.16530754805618383, -0.12004686160143718, -0.1277492962760758, -0.07577261495471371, 0.05271339675883564, 0.028985695775421295, 0.05512120616221927, 0.03210433984883298, -0.10868063766290159, -0.022833789702993712, 0.3774318242871215, -0.07768166361712983, 0.14152174897289654, 0.20814064975271668, -0.2084130633852078, -0.13516355175482808, 0.2177226663055109, 0.10288491444261871, 0.09629528008810165, -0.18634764775128115, -0.020544591212562996, -0.002927562378861044, 0.19040587999619865, 0.09135534351784315, 0.11184990519597285, 0.2682304389467168, 0.111465584252312, -0.016366755875350057, 0.031931575938186935, -0.302622470862761, 0.03588600427426431, -0.26773625364678816, -0.08276338179119572, -0.15172437817854934, 0.13851465682539407, -0.1407479340224648, -0.09294558940897801, 0.39020116026281504, 0.0694634904347495, 0.21858787790206324, -0.0009843427361288357, 0.2537262432816611, 0.08370852945014261, 0.10789967591166327, 0.11169295205325899, 0.36858619450764285, 0.15740520716644824, 0.16266611232306405, -0.19868543657565876, 0.07942669917260427, -0.005129735514403603]
|
707.162
|
Level Spacings in Random Matrix Theory and Coulomb Blockade Peaks in
Quantum Dots
|
We obtain analytic formulae for the spacing between conductance peaks in the
Coulomb blockade regime, based on the universal Hamiltonian model of quantum
dots. New random matrix theory results are developed in order to treat
correlations between two and three consecutive spacings in the energy level
spectrum. These are generalizations of the Wigner surmise for the probability
distribution of single level spacing. The analytic formulae are shown to be in
good agreement with numerical evaluation.
|
cond-mat.mes-hall
|
we obtain analytic formulae for the spacing between conductance peaks in the coulomb blockade regime based on the universal hamiltonian model of quantum dots new random matrix theory results are developed in order to treat correlations between two and three consecutive spacings in the energy level spectrum these are generalizations of the wigner surmise for the probability distribution of single level spacing the analytic formulae are shown to be in good agreement with numerical evaluation
|
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|
[-0.11901054908055812, 0.14678517554983653, -0.08986138329530756, 0.11391057079657912, 0.05209577274353554, -0.1459651982411742, 0.036697406186722216, 0.4022853082915147, -0.2045713705321153, -0.293381423416237, -0.010351032316684723, -0.30674416999022164, -0.1420931047697862, 0.21119078005043168, -0.0009116500988602638, 0.09176991457740466, 0.06211774858335654, 0.032042712792754176, -0.10078149029364189, -0.19619952326019605, 0.28525543499117095, 0.01776911491372933, 0.2942104113350312, 0.09982758238911629, 0.020180308582882087, 0.0034096366073936226, 0.0282523741821448, -0.026796076148748398, -0.15336628009371148, 0.10067810980370268, 0.24141878525416055, -0.02422725479428967, 0.22719551810373861, -0.43212021415432295, -0.14820289904251693, 0.04494624930123488, 0.13107506352787215, 0.1240163953555748, -0.0015737024399762353, -0.2610843473797043, 0.05747981456418832, -0.17370816487818957, -0.1354425708949566, -0.10406413400235276, -0.007372645021726688, 0.06224760937194029, -0.3057991789591809, 0.13946862060576679, -0.006849542300527294, 0.03766332548111677, -0.027953483139475186, -0.1502775257267058, 0.013570473374178013, 0.16920398586119215, 0.015291031771339477, -0.04609414874498422, 0.05615683987581482, -0.07479168860862652, -0.12771130804593364, 0.3371954675763845, -0.04534067763481289, -0.211536240230004, 0.12826359346819421, -0.22103209285686412, -0.12342662684619427, 0.10597089940061172, 0.10379645767621697, 0.05590107559226453, -0.13275431769279142, 0.06822645287262276, -0.015848669161399206, 0.15800156861543654, 0.105788268117855, 0.07575849349212756, 0.21383905984461307, 0.09382418446242809, 0.004025675319135189, 0.11073526919043312, -0.08889341913474103, -0.21555610420803228, -0.31953054348627724, -0.09014616744282344, -0.2329367340231935, 0.04330981169516841, -0.1125993601292915, -0.18982462167856284, 0.40524646726010055, 0.15274966796239217, 0.235829834829395, 0.08987171689669292, 0.2538779422144095, 0.21155952556679647, 0.022120668770124516, 0.0007133746830125649, 0.20734375136593977, 0.20740014307200907, 0.007741985840645308, -0.2232842351992925, -0.020614602932085592, 0.10041420112674435]
|
707.1621
|
Decoupling limits of N=4 super Yang-Mills on R x S^3
|
We find new decoupling limits of N=4 super Yang-Mills (SYM) on R x S^3 with
gauge group SU(N). These decoupling limits lead to decoupled theories that are
much simpler than the full N=4 SYM but still contain many of its interesting
features. The decoupling limits correspond to being in a near-critical region,
near a point with zero temperature and critical chemical potentials. The new
decoupling limits are found by generalizing the limits of hep-th/0605234 to
include not only the chemical potentials for the SU(4) R-symmetry of N=4 SYM
but also the chemical potentials corresponding to the SO(4) symmetry. In the
decoupled theories it is possible to take a strong coupling limit in a
controllable manner since the full effective Hamiltonian is known. For planar
N=4 SYM on R x S^3 all the decoupled theories correspond to fully integrable
spin chains. We study the thermodynamics of the decoupled theories and find the
Hagedorn temperature for small and large values of the effective coupling. We
find an alternative formulation of the decoupling limits in the microcanonical
ensemble. This leads to a characterization of certain regimes of weakly coupled
N=4 SYM in which there are string-like states. Finally, we find a similar
decoupling limit for pure Yang-Mills theory, which for the planar limit leads
to a fully integrable decoupled theory.
|
hep-th
|
we find new decoupling limits of n4 super yangmills sym on r x s3 with gauge group sun these decoupling limits lead to decoupled theories that are much simpler than the full n4 sym but still contain many of its interesting features the decoupling limits correspond to being in a nearcritical region near a point with zero temperature and critical chemical potentials the new decoupling limits are found by generalizing the limits of hepth0605234 to include not only the chemical potentials for the su4 rsymmetry of n4 sym but also the chemical potentials corresponding to the so4 symmetry in the decoupled theories it is possible to take a strong coupling limit in a controllable manner since the full effective hamiltonian is known for planar n4 sym on r x s3 all the decoupled theories correspond to fully integrable spin chains we study the thermodynamics of the decoupled theories and find the hagedorn temperature for small and large values of the effective coupling we find an alternative formulation of the decoupling limits in the microcanonical ensemble this leads to a characterization of certain regimes of weakly coupled n4 sym in which there are stringlike states finally we find a similar decoupling limit for pure yangmills theory which for the planar limit leads to a fully integrable decoupled theory
|
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|
[-0.13432309246531482, 0.20847109262838245, -0.06734329600436063, 0.07274332529858737, -0.019610631273179833, -0.16727508160423626, 0.015340758677296064, 0.32180004369001836, -0.18866871997198797, -0.24011868478178425, 0.09541910805219905, -0.28300796926379446, -0.12650785135445874, 0.10588227772084927, 0.002119527055954138, 0.02636867598340797, 0.004197532254221625, 0.06651767456356471, -0.1256797452755294, -0.23873990343094598, 0.26818186657059145, -0.026501512098884968, 0.2621958189335634, 0.07345846890799564, 0.09319886115554255, -0.007431190963230889, 0.055970301134948386, 0.0012874794090209805, -0.11785277060392184, 0.10759013442320456, 0.24171389786405834, 0.027300539978400425, 0.09940991451730952, -0.4485780730050195, -0.22418017528899428, 0.08565618774338402, 0.18897459422199367, 0.14863500133031737, 0.011501643085028735, -0.2444917069278071, 0.036473687968854966, -0.16071638001853394, -0.17649466482139864, -0.0966449064909722, 0.03226986975641921, -0.0844348303755935, -0.2680152606378585, 0.06955014366219446, 0.06327402723642687, 0.022833865472219057, -0.023956883317657263, -0.08079885557418931, -0.08592209866846032, 0.09737941775583075, 0.0603163564077544, 0.03841006449699678, 0.13134873607163577, -0.1896882150936613, -0.07405880960437504, 0.3657781961934503, -0.08154248262717037, -0.1944441355105179, 0.2515184775952043, -0.14995852406610977, -0.21631457364936876, 0.1265276015382605, 0.09483136477474882, 0.18003301166808577, -0.1612602201273182, 0.22573636218617643, -0.03666139451390201, 0.14332568983418578, 0.08586865654797293, 0.07039240179707391, 0.24436464879006423, 0.13032147887214604, 0.10317523832539639, 0.13414631064774263, 0.01473342084662161, -0.15389927244487572, -0.3635186420201703, -0.08635141136323067, -0.10616652131526887, 0.10647500305943443, -0.14556471924104833, -0.1806817228983467, 0.34043947058833307, 0.1568870685835093, 0.1852304525641052, 0.08389640059343677, 0.1732919541687739, 0.16661143195556682, 0.09273180715455157, 0.05721572580040191, 0.3000113627434547, 0.1982120218507825, 0.06304587308895188, -0.23691375135375117, -0.1204891097333058, 0.12224501818612528]
|
707.1622
|
Dynamic Failure in Amorphous Solids via a Cavitation Instability
|
The understanding of dynamic failure in amorphous materials via the
propagation of free boundaries like cracks and voids must go beyond elasticity
theory, since plasticity intervenes in a crucial and poorly understood manner
near the moving free boundary. In this Letter we focus on failure via a
cavitation instability in a radially-symmetric stressed material, set up the
free boundary dynamics taking both elasticity and visco-plasticity into
account, using the recently proposed athermal Shear Transformation Zone theory.
We demonstrate the existence (in amorphous systems) of fast cavitation modes
accompanied by extensive plastic deformations and discuss the revealed physics.
|
cond-mat.mtrl-sci cond-mat.dis-nn
|
the understanding of dynamic failure in amorphous materials via the propagation of free boundaries like cracks and voids must go beyond elasticity theory since plasticity intervenes in a crucial and poorly understood manner near the moving free boundary in this letter we focus on failure via a cavitation instability in a radiallysymmetric stressed material set up the free boundary dynamics taking both elasticity and viscoplasticity into account using the recently proposed athermal shear transformation zone theory we demonstrate the existence in amorphous systems of fast cavitation modes accompanied by extensive plastic deformations and discuss the revealed physics
|
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|
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|
707.1623
|
Derivation of the Quantum Probability Rule without the Frequency
Operator
|
We present an alternative frequencists' proof of the quantum probability rule
which does not make use of the frequency operator, with expectation that this
can circumvent the recent criticism against the previous proofs which use it.
We also argue that avoiding the frequency operator is not only for technical
merits for doing so but is closely related to what quantum mechanics is all
about from the viewpoint of many-world interpretation.
|
quant-ph
|
we present an alternative frequencists proof of the quantum probability rule which does not make use of the frequency operator with expectation that this can circumvent the recent criticism against the previous proofs which use it we also argue that avoiding the frequency operator is not only for technical merits for doing so but is closely related to what quantum mechanics is all about from the viewpoint of manyworld interpretation
|
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|
[-0.04756142078827986, 0.08824203538128843, -0.13205954055381985, 0.07123176311142743, -0.1693893904203846, -0.13678554197827328, 0.07793828713086744, 0.359424809101915, -0.2483344023956148, -0.24365164285552673, 0.11776104443234162, -0.23834201904094737, -0.1956724583481749, 0.19708921703040952, -0.15465658495499604, 0.028122463223078976, 0.062357822514098625, 0.06650695040066174, -0.047238308484193636, -0.22042417991737687, 0.3314121773641934, 0.10193763247799074, 0.28253138787450566, 0.0893316163978391, 0.0783788040685265, 0.004421760193139747, -0.027759538875703794, -0.00036632309438309807, -0.10449424513680625, 0.11902877635767926, 0.23566077158286952, 0.19263797094775498, 0.2928063822100344, -0.41310836355863273, -0.19166024660934572, 0.12615769882888897, 0.13164978812489173, 0.1649493094014031, -0.010935099397286556, -0.24540760640081935, 0.09033167517602282, -0.16323015504125235, -0.15014654640918193, -0.12074283668366463, 0.0032474803367116747, -0.05062208594619364, -0.20406265730929116, 0.064778583641822, 0.13136758219342734, 0.018439450571178528, -0.0006647131682468065, -0.1251096590489581, 0.06197865407212057, 0.07845113815172859, 0.07247822510206775, 0.02010049907055319, 0.09432848486914366, -0.09983104877376361, -0.1571697586796422, 0.3579311358971872, 0.026716232529260975, -0.22637853464381635, 0.18899501264567717, -0.12667655210226667, -0.15883995177548216, 0.04434740644596193, 0.014007117356295172, 0.10527134631368992, -0.13599273574241585, 0.08095828084396603, -0.061360013414768204, 0.2035859971580541, 0.06308249139861352, 0.08533376047684663, 0.1896839128078326, 0.04847501644837684, 0.08397554181030263, 0.08700861739318656, -0.01691572262865046, -0.16626989371075795, -0.34617873737453553, -0.17259284770251185, -0.20382782250501053, 0.10756598886117623, 0.0034710289100589957, -0.1800279878889737, 0.36003880144731293, 0.28665291785896907, 0.1987018912517722, 0.07983135195462492, 0.33309759512759635, 0.1527563850732817, 0.079825969527651, 0.04699709022795592, 0.2652296005491761, 0.09377017140766417, 0.0902224974706769, -0.1776148617449824, 0.09393226751632502, 0.07813609696492768]
|
707.1624
|
Sound beyond the speed of light: destructive interference, anomalous
dispersion and nonlocality of near field
|
Experimentally fixed sound pulse beyond of light speed in the region of
anomalous dispersion [W. M. Robertson, e. a. Appl. Phys. Lett, 90, 014102
(2007)] can be explained, as well as the similar superluminal phenomena, by
"the nonlocality in the small" of near electromagnetic field at transferring of
relevanted excitations.
|
physics.class-ph physics.optics
|
experimentally fixed sound pulse beyond of light speed in the region of anomalous dispersion w m robertson e a appl phys lett 90 014102 2007 can be explained as well as the similar superluminal phenomena by the nonlocality in the small of near electromagnetic field at transferring of relevanted excitations
|
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|
[-0.1296397201260742, 0.2188077083389674, -0.044165907228099446, -0.007790484769763995, -0.0726322278770029, -0.11234525926601217, 0.08749572037227989, 0.32489897202396273, -0.18554955918569954, -0.38572092057794943, -0.033286015811965476, -0.25761008369546307, -0.10222714588198127, 0.23497306258531706, -0.0828665445555163, 0.03574790113738605, -0.016514985860154336, -0.0028949913245682815, -0.015666474873314098, -0.16108776331518074, 0.15492818394808897, 0.10722454403508075, 0.25919028493214624, 0.07329496788811318, 0.09126805341137308, 0.046574041465943565, 0.014585583603807859, 0.01784727264347733, -0.0984756814182869, -0.009330508964402335, 0.22084511018225125, 0.022406979877387687, 0.21205801212665987, -0.3658841450375562, -0.2812439568948989, 0.06215706034278383, 0.13364523457724373, 0.11412199119067921, 0.04703270731379791, -0.3960006963081506, 0.021349762319302072, -0.16843303319598948, -0.19015085662011894, -0.03939141182951173, 0.15010795051621614, -0.005178791926983668, -0.19768624870600748, 0.18651432678939736, 0.08127375314135712, 0.06450479532763058, 0.049163027314887364, -0.06726733629344678, -0.07593286166214669, -0.026507160882940705, -0.01663861451409187, 0.07460865465810104, 0.12777607872778055, -0.11490624099589732, -0.14960128654326713, 0.38111353429908656, -0.14227105418638308, -0.09967317181278249, 0.18528652656823397, -0.19232884841039777, -0.02973058897697804, 0.164186833578409, 0.18228207371905636, 0.10840330022026082, -0.1254006112327001, 0.14600398596756312, -0.08875970782329594, 0.09574196948574817, 0.22304933577091718, 0.07861555232761466, 0.23654053928520608, 0.11268199923239192, -0.05181032594065277, 0.0634553651159097, -0.09829582064887699, -0.007130550705276581, -0.3879863714077035, -0.1535488422960043, -0.21605975675035496, 0.09966864735268209, -0.029922197669998703, -0.0700914059214446, 0.37422329803206483, 0.12290115837882064, 0.21049801625159323, -0.06626543296234948, 0.17818849223038677, 0.11003057933792625, 0.002602831213449945, 0.1995634824531723, 0.3627401030793482, 0.2023364223435293, 0.15074068108307465, -0.24578305607547565, -0.00017302352174812435, -0.012510414396849821]
|
707.1625
|
Double affine Hecke algebra in logarithmic conformal field theory
|
We construct the representation of Double Affine Hecke Algebra whose
symmetrization gives the center of the quantum group U_q(sl(2)) and by
Kazhdan--Lusztig duality the Verlinde algebra of (1,p) models of logarithmic
conformal field theory.
|
math.QA hep-th
|
we construct the representation of double affine hecke algebra whose symmetrization gives the center of the quantum group u_qsl2 and by kazhdanlusztig duality the verlinde algebra of 1p models of logarithmic conformal field theory
|
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|
[-0.15747262212886093, 0.08672272249617997, -0.12739435342304847, 0.04409007668180172, -0.1081786075990428, -0.2222658895942218, -0.010676495569093865, 0.24609514199854696, -0.4147370635148357, -0.15728910930235596, 0.04267363472814288, -0.21348516796441638, -0.21577948156525106, 0.11506447530187228, -0.1396496185060481, -0.004556272945859853, -0.02178520435357795, 0.16696827738162348, -0.1620848636581179, -0.2719002469059299, 0.4164422463543494, 0.060367331877761686, 0.28455158586011214, -0.0077139741795904495, 0.12749045747606194, 0.08316550225786426, -0.012382825398269822, -0.12536560796091661, -0.1446531795184402, 0.21953163082327912, 0.28733151066872403, 0.049155161332558185, 0.16611334971864433, -0.4040292019353193, -0.06439227531390156, 0.14079057397868702, 0.17475650497534148, 0.06133245538427111, -0.04772025691208375, -0.2961412764099591, 0.0389200378455879, -0.285783527090269, -0.20518992294776528, -0.055387719753472245, 0.03143818302915486, -0.07292885842787869, -0.21714583324158893, 0.040438879116931385, 0.06158314711030792, 0.15011627117500587, -0.11185953251140959, -0.09265579546199125, -0.07670478637823287, 0.05728827604188529, -0.07906338325975572, 0.07434556189486209, 0.17390671757268994, -0.1312359385740231, -0.25730986509691267, 0.3262327680473818, 0.00938826470690615, -0.20490064877359307, 0.043779911692528165, -0.26030070527785404, -0.17031527211999192, 0.03989038506851477, 0.010425390456529224, 0.04014345596763579, 0.02801396366318359, 0.31554516059558785, -0.1552124166970744, -0.06220770624521024, 0.1011189595412682, -0.03231129063950742, 0.14168933954309015, -0.02988305257852463, -0.0017438747728353039, 0.1426252631799263, 0.03476015386609908, -0.13593620779540608, -0.44474662730799003, -0.23726228186312845, -0.0908915216979735, 0.16062375968869994, -0.19815019229110262, -0.19889945054755492, 0.39271190899479036, 0.04400914179303286, 0.16351579550160644, 0.1322698254850419, 0.10869953825193293, 0.1872406062834403, 0.1917058040990549, -0.011986696517423671, 0.11482282208881396, 0.3797128160059562, -0.07093194198644008, -0.22922701684429364, -0.14350641516776866, 0.3644290341557387]
|
707.1626
|
Asymptotically nonexpansive mappings in uniformly convex hyperbolic
spaces
|
This paper provides a fixed point theorem for asymptotically nonexpansive
mappings in uniformly convex hyperbolic spaces as well as new effective results
on the Krasnoselski-Mann iterations of such mappings. The latter were found
using methods from logic and the paper continues a case study in the general
program of extracting effective data from prima-facie ineffective proofs in the
fixed point theory of such mappings.
|
math.FA math.LO
|
this paper provides a fixed point theorem for asymptotically nonexpansive mappings in uniformly convex hyperbolic spaces as well as new effective results on the krasnoselskimann iterations of such mappings the latter were found using methods from logic and the paper continues a case study in the general program of extracting effective data from primafacie ineffective proofs in the fixed point theory of such mappings
|
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|
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|
707.1627
|
Soft X-ray Circular Reflectivity from Ferromagnetic Transition-Metal
Films Near the Brewster's Angle: Theoretical and Numerical X-ray Resonant
Magnetic Scattering Study
|
We first report a novel phenomenon that manifests itself in a colossal
difference in soft x-ray reflectivity from ferromagnetic transition-metal films
between the left- and right-handed circular polarization (LCP and RCP) modes at
a resonance near normal Brewster's angle. Theoretical and numerical studies of
sft x-ray resonant magnetic scattering using the circular-polarization-mode
basis reveal that this effect arises from a totally destructive interference of
photons scattered individually from chargem orbital, and spin degrees of
freedom in magnetized thin films that selectively occurs only for one helicity
of the opposite circular modes when the required criteria are fulfilled. Across
the normal Brewster's angle. the polarization state of scattered soft x-ray is
continuously variable from the RCP to the LCP mode (or vice versa) through the
linear s polarization mode by changing the incidence angle of linear
p-polarized x rays at the resonance.
|
cond-mat.other
|
we first report a novel phenomenon that manifests itself in a colossal difference in soft xray reflectivity from ferromagnetic transitionmetal films between the left and righthanded circular polarization lcp and rcp modes at a resonance near normal brewsters angle theoretical and numerical studies of sft xray resonant magnetic scattering using the circularpolarizationmode basis reveal that this effect arises from a totally destructive interference of photons scattered individually from chargem orbital and spin degrees of freedom in magnetized thin films that selectively occurs only for one helicity of the opposite circular modes when the required criteria are fulfilled across the normal brewsters angle the polarization state of scattered soft xray is continuously variable from the rcp to the lcp mode or vice versa through the linear s polarization mode by changing the incidence angle of linear ppolarized x rays at the resonance
|
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|
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|
707.1628
|
On the solutions of a boundary value problem arising in free convection
with prescribed heat flux
|
For given $a\in\R$, c<0, we are concerned with the solution $f^{}_b$ of the
differential equation
$f^{\prime\prime\prime}+ff^{\prime\prime}+\g(f^{\prime})=0$, satisfying the
initial conditions $f(0)=a$, $f'(0)=b$, $f''(0)=c< 0$, where g is some
nonnegative subquadratic locally Lipschitz function. It is proven that there
exists $b_*>0$ such that $f^{}_b$ exists on $[0,+\infty)$ and is such that
$f'_b(t)\to 0$ as $t\to+\infty$, if and only if $b\geq b_*$. This allows to
answer questions about existence, uniqueness and boundedness of solutions to a
boundary value problem arising in fluid mechanics, and especially in boundary
layer theory.
|
math.DS
|
for given ainr c0 we are concerned with the solution f_b of the differential equation fprimeprimeprimeffprimeprimegfprime0 satisfying the initial conditions f0a f0b f0c 0 where g is some nonnegative subquadratic locally lipschitz function it is proven that there exists b_0 such that f_b exists on 0infty and is such that f_btto 0 as ttoinfty if and only if bgeq b_ this allows to answer questions about existence uniqueness and boundedness of solutions to a boundary value problem arising in fluid mechanics and especially in boundary layer theory
|
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|
707.1629
|
Storing quantum states in bosonic dissipative networks
|
Considering a network of dissipative quantum harmonic oscillators we deduce
and analyze the optimum topologies which are able to store, for the largest
period of time, a quantum superposition previously prepared in one of the
network oscillators. The storage of the superposition is made dynamically, in
that the state to be protected evolves through the network before being
retrieved back in the oscillator where it was prepared. The decoherence time
during the dynamic storage process is computed and we demonstrate that it is
proportional to the number of oscillators in the network for a particular
regime of parameters.
|
quant-ph
|
considering a network of dissipative quantum harmonic oscillators we deduce and analyze the optimum topologies which are able to store for the largest period of time a quantum superposition previously prepared in one of the network oscillators the storage of the superposition is made dynamically in that the state to be protected evolves through the network before being retrieved back in the oscillator where it was prepared the decoherence time during the dynamic storage process is computed and we demonstrate that it is proportional to the number of oscillators in the network for a particular regime of parameters
|
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|
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