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801.4173
Manuel Linares
Manuel Linares, Rudy Wijnands, Michiel van der Klis (Amsterdam), Hans Krimm, Craig Markwardt (GSFC), Deepto Chakrabarty (MIT)
Timing and spectral properties of the accreting millisecond pulsar SWIFT J1756.9-2508
Accepted for publication in The Astrophysical Journal. Scheduled for the ApJ May 10, 2008, v678n 2 issue. 6 pages, 5 figures. Uses \emulateapj
null
10.1086/533498
null
astro-ph
null
SWIFT J1756.9-2508 is one of the few accreting millisecond pulsars (AMPs) discovered to date. We report here the results of our analysis of its aperiodic X-ray variability, as measured with the Rossi X-ray Timing Explorer during the 2007 outburst of the source. We detect strong (~35%) flat-topped broadband noise throughout the outburst with low characteristic frequencies (~0.1 Hz). This makes SWIFT J1756.9-2508 similar to the rest of AMPs and to other low luminosity accreting neutron stars when they are in their hard states, and enables us to classify this AMP as an atoll source in the extreme island state. We also find a hard tail in its energy spectrum extending up to 100 keV, fully consistent with such source and state classification.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 01:55:13 GMT" } ]
2009-11-13T00:00:00
[ [ "Linares", "Manuel", "", "Amsterdam" ], [ "Wijnands", "Rudy", "", "Amsterdam" ], [ "van der Klis", "Michiel", "", "Amsterdam" ], [ "Krimm", "Hans", "", "GSFC" ], [ "Markwardt", "Craig", "", "GSFC" ], [ "Chakrabarty", "Deepto", "", "MIT" ] ]
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801.4174
Semen Kutateladze S
S.S. Kutateladze
Sobolev of the Euler School
11 pages; a few typos corrected
Siberian Math. J., 2008, V.49, No.5, 771-779
null
null
math.HO math.FA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This is a short overview of the origins of distribution theory as well as the life of Sergei Sobolev (1908--1989) and his contribution to the formation of the modern outlook of mathematics.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 12:56:45 GMT" }, { "version": "v2", "created": "Tue, 29 Jan 2008 02:12:24 GMT" }, { "version": "v3", "created": "Wed, 30 Jan 2008 13:51:22 GMT" }, { "version": "v4", "created": "Thu, 31 Jan 2008 14:39:30 GMT" }, { "version": "v5", "created": "Fri, 1 Feb 2008 04:51:24 GMT" }, { "version": "v6", "created": "Wed, 13 Feb 2008 07:20:41 GMT" }, { "version": "v7", "created": "Fri, 15 Feb 2008 18:24:42 GMT" }, { "version": "v8", "created": "Fri, 8 May 2009 03:12:34 GMT" } ]
2011-05-31T00:00:00
[ [ "Kutateladze", "S. S.", "" ] ]
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801.4175
Roman Lutchyn
Roman M. Lutchyn, Pavel Nagornykh, Victor M. Yakovenko
Gauge-invariant electromagnetic response of a chiral px+ipy superconductor
22 pages, 4 figures, final version as published in PRB
Phys. Rev. B 77, 144516 (2008)
10.1103/PhysRevB.77.144516
null
cond-mat.supr-con cond-mat.mes-hall
null
We present a gauge-invariant theory of the electromagnetic response of a chiral px+ipy superconductor in the clean limit. Due to the spontaneously broken time-reversal symmetry, the effective action of the system contains an anomalous term not present in conventional superconductors. As a result, the electromagnetic charge and current responses contain anomalous terms, which depend explicitly on the chirality of the superconducting order parameter. These terms lead to a number of unusual effects, such as coupling of the transverse currents to the collective plasma oscillations and a possibility of inducing the charge density by the magnetic field perpendicular to the conducting planes. We calculate the antisymmetric part of the conductivity tensor (the intrinsic Hall conductivity) and show that it depends on the wave vector of the electromagnetic field. We also show that the Mermin-Muzikar magnetization current and the Hall conductivity are strongly suppressed at high frequencies. Finally, we discuss implications of the theory to the experiments in Sr2RuO4.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 18:48:25 GMT" }, { "version": "v2", "created": "Wed, 14 May 2008 21:54:05 GMT" } ]
2008-05-15T00:00:00
[ [ "Lutchyn", "Roman M.", "" ], [ "Nagornykh", "Pavel", "" ], [ "Yakovenko", "Victor M.", "" ] ]
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801.4176
Sogo Kuroiwa
S. Kuroiwa, Y. Saura, J. Akimitsu, M. Hiraishi, M. Miyazaki, K. H. Satoh, S. Takeshita, R. Kadono
Multigap superconductivity in sesquicarbides La$_2$C$_3$ and Y$_2$C$_3$
5 pages, 4 figures
Phys. Rev. Lett. 100, 097002 (2008)
10.1103/PhysRevLett.100.097002
null
cond-mat.supr-con
null
A complex structure of the superconducting order parameter in $Ln_2$C$_3$ ($Ln$ = La, Y) is demonstrated by muon spin relaxation ($\mu$SR) measurements in their mixed state. The muon depolarization rate [$\sigma_{\rm v}(T)$] exhibits a characteristic temperature dependence that can be perfectly described by a phenomenological double-gap model for nodeless superconductivity. While the magnitude of two gaps is similar between La$_2$C$_3$ and Y$_2$C$_3$, a significant difference in the interband coupling between those two cases is clearly observed in the behavior of $\sigma_{\rm v}(T)$.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 02:34:20 GMT" }, { "version": "v2", "created": "Fri, 7 Mar 2008 08:23:14 GMT" } ]
2009-11-13T00:00:00
[ [ "Kuroiwa", "S.", "" ], [ "Saura", "Y.", "" ], [ "Akimitsu", "J.", "" ], [ "Hiraishi", "M.", "" ], [ "Miyazaki", "M.", "" ], [ "Satoh", "K. H.", "" ], [ "Takeshita", "S.", "" ], [ "Kadono", "R.", "" ] ]
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801.4177
Sergey Bastrukov
S. Bastrukov, H-K. Chang, G.-T. Chen, I. Molodtsova
Eigenfrequency of nodeless elastic vibrations locked in the crust of quaking neutron star
10 pages, 3 figures: Mod.Phys.Lett. A23 (2008) 477
Mod. Phys. Lett. A, Vol. 23, No. 7 (2008) pp. 477-486
10.1142/S0217732308026534
null
astro-ph
null
The Newtonian solid-mechanical theory of non-compressional spheroidal and torsional nodeless elastic vibrations in the homogenous crust model of a quaking neutron star is developed and applied to the modal classification of the quasi-periodic oscillations (QPOs) of X-ray luminosity in the aftermath of giant flares in SGR 1806-20 and SGR 1900+14. Particular attention is given to the low-frequency QPOs in the data for SGR 1806-20 whose physical origin has been called into question. Our calculations suggest that unspecified QPOs are due to nodeless dipole torsional and dipole spheroidal elastic shear vibrations.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 02:43:27 GMT" }, { "version": "v2", "created": "Mon, 4 Feb 2008 14:05:20 GMT" }, { "version": "v3", "created": "Tue, 1 Apr 2008 04:34:57 GMT" } ]
2009-11-13T00:00:00
[ [ "Bastrukov", "S.", "" ], [ "Chang", "H-K.", "" ], [ "Chen", "G. -T.", "" ], [ "Molodtsova", "I.", "" ] ]
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801.4178
Donald F. Figer
Donald F. Figer
Young Massive Clusters
Conference proceedings, Massive Stars as Cosmic Engines, IAU Symp 250, ed. F. Bresolin, P. A. Crowther, & J. Puls (Cambridge Univ. Press) with corrected typo
null
10.1017/S1743921308020565
null
astro-ph
null
Over the past ten years, there has been a revolution in our understanding of massive young stellar clusters in the Galaxy. Initially, there were no known examples having masses $>10^4$, yet we now know that there are at least a half dozen such clusters in the Galaxy. In all but one case, the masses have been determined through infrared observations. Several had been identified as clusters long ago, but their massive natures were only recently determined. Presumably, we are just scratching the surface, and we might look forward to having statistically significant samples of coeval massive stars at all important stages of stellar evolution in the near future. I review the efforts that have led to this dramatic turn of events and the growing sample of young massive clusters in the Galaxy.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 02:44:54 GMT" }, { "version": "v2", "created": "Fri, 28 Mar 2008 22:52:45 GMT" } ]
2009-11-13T00:00:00
[ [ "Figer", "Donald F.", "" ] ]
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801.4179
Jacob Sturm
D.H. Phong, Jacob Sturm
Lectures on Stability and Constant Scalar Curvature
85 pages, minor corrections added
null
null
null
math.DG math.CV
null
An introduction is provided to some current research trends in stability in geometric invariant theory and the problem of Kaehler metrics of constant scalar curvature. Besides classical notions such as Chow-Mumford stability, the emphasis is on several new stability conditions, such as K-stability, Donaldson's infinite-dimensional GIT, and conditions on the closure of orbits of almost-complex structures under the diffeomorphism group. Related analytic methods are also discussed, including estimates for energy functionals, Tian-Yau-Zelditch approximations, estimates for moment maps, complex Monge-Ampere equations and pluripotential theory, and the Kaehler-Ricci flow
[ { "version": "v1", "created": "Mon, 28 Jan 2008 03:24:34 GMT" }, { "version": "v2", "created": "Thu, 28 Feb 2008 19:43:58 GMT" } ]
2008-02-28T00:00:00
[ [ "Phong", "D. H.", "" ], [ "Sturm", "Jacob", "" ] ]
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801.418
Xinping Xu
Xinping Xu, Feng Liu
Continuous-time quantum walks on one-dimension regular networks
Typos corrected and Phys. ReV. E comments considered in this version
Phys. Rev. E 77, 061127 (2008)
10.1103/PhysRevE.77.061127
null
quant-ph
null
In this paper, we consider continuous-time quantum walks (CTQWs) on one-dimension ring lattice of N nodes in which every node is connected to its 2m nearest neighbors (m on either side). In the framework of the Bloch function ansatz, we calculate the spacetime transition probabilities between two nodes of the lattice. We find that the transport of CTQWs between two different nodes is faster than that of the classical continuous-time random walk (CTRWs). The transport speed, which is defined by the ratio of the shortest path length and propagating time, increases with the connectivity parameter m for both the CTQWs and CTRWs. For fixed parameter m, the transport of CTRWs gets slow with the increase of the shortest distance while the transport (speed) of CTQWs turns out to be a constant value. In the long time limit, depending on the network size N and connectivity parameter m, the limiting probability distributions of CTQWs show various paterns. When the network size N is an even number, the probability of being at the original node differs from that of being at the opposite node, which also depends on the precise value of parameter m.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 03:02:02 GMT" }, { "version": "v2", "created": "Fri, 18 Apr 2008 02:10:17 GMT" } ]
2009-11-13T00:00:00
[ [ "Xu", "Xinping", "" ], [ "Liu", "Feng", "" ] ]
[ 0.0310504064, -0.0062565678, 0.030642854, 0.0522686094, -0.0300824679, -0.0512242541, 0.0198045038, 0.0121374223, -0.1126882657, 0.1290922463, 0.0088897385, 0.114827916, -0.064189516, 0.1535454094, 0.0985258147, 0.0195625201, -0.0018387622, -0.0131308325, 0.0994937569, 0.0578724556, -0.0745311603, -0.0078899618, 0.0176775903, -0.0972522125, -0.1206355393, -0.0135001764, 0.0206196085, 0.0332155302, 0.0601649359, -0.0399656184, 0.029929636, -0.0421052687, -0.0877256766, -0.0728500113, 0.0057089189, 0.1468207836, -0.0126532316, 0.0401693918, 0.0005130226, 0.0263126083, -0.0217149071, 0.0067309844, -0.0976597667, 0.0334193036, -0.0122329425, -0.0967937186, -0.0809501112, 0.0963861644, -0.0318145677, 0.0681122094, -0.0132836644, 0.1038239971, -0.1106505021, -0.1018371806, -0.0594007783, -0.035762731, 0.0257012788, -0.0075460891, 0.0791161284, -0.0361702852, 0.0246441904, -0.1289903671, -0.0040882612, 0.0062342798, -0.0200592242, -0.0105263172, -0.0449071899, -0.0841595903, 0.0198809206, 0.0347947963, -0.0932276323, 0.0411882736, 0.0890502185, 0.0359410346, 0.0410609134, 0.0315343738, -0.0691820383, 0.0394561775, -0.0077371295, 0.0592479445, 0.0632725284, -0.0023227308, -0.0004648646, -0.0688254312, -0.0654631183, -0.0704046935, -0.0674499348, -0.068723537, -0.0193714797, 0.0034068841, 0.0344381854, 0.0822746605, -0.008017322, -0.0330117531, 0.0200592242, -0.0417741314, 0.1236921847, -0.0007144109, -0.0300569963, -0.0613366514, -0.0347693227, 0.0408061929, 0.093023859, -0.0677046552, 0.1852326095, 0.0210016891, -0.0265163835, -0.0238545574, -0.1192091033, 0.0163657796, 0.0087623782, -0.0595536083, 0.0185181666, 0.0444232225, 0.0144299055, -0.0621517561, -0.0006865509, -0.1255261749, 0.0419524349, 0.1050466597, -0.014748306, -0.024172958, 0.0885917246, 0.003234948, -0.0125258714, -0.0096220598, 0.0076352414, -0.0973031595, -0.0559365787, 0.1012767926, 0.0911389291, -0.0458751284, 0.0239182375, -0.021867739, -0.1619002223, -0.0262871366, -0.0281720664, 0.0721367896, 0.0272805449, -0.0478874184, 0.0121883666, 0.0575667918, -0.0054478305, 0.0353806503, 0.0547648668, 0.0700480863, 0.0414939374, 0.0923615843, 0.0100359805, -0.0034673803, 0.0181233492, -0.0791670755, 0.0978126004, -0.0181615576, 0.029140003, -0.0686216503, -0.0435062274, 0.1490623206, 0.0300060529, -0.03122871, -0.0212054662, 0.0178813655, -0.1076957509, -0.0172700379, 0.1308243573, -0.0509185903, -0.0682140961, 0.0004230745, -0.0664820001, -0.0271786563, 0.0562422462, -0.0888973847, -0.0768236443, 0.0367561392, 0.0792689621, -0.0336994976, -0.1137071475, -0.1245072857, -0.006546312, 0.0188110955, 0.0536950417, 0.0482949726, -0.0098067317, -0.139179185, -0.024822494, -0.0146591542, 0.003343204, 0.063323468, -0.0142261293, -0.0450345501, -0.1022447348, 0.1994969547, -0.013958673, 0.0353042334, -0.0420033783, -0.0661253929, 0.0409844965, 0.0312796533, 0.0196644086, -0.0445505828, 0.0352532901, 0.0238418207, 0.0120673748, -0.016047379, 0.0525233299, 0.0355844274, 0.0895596594, 0.0361448117, -0.0166332368, -0.0541535392, 0.0001211912, -0.0275352653, 0.0665838867, 0.0030168437, -0.0524214394, 0.0149011379, -0.037622191, 0.1039768308, 0.0711179078, 0.0990862027, -0.0135129122, 0.0190912876, 0.006508104, 0.070149973, -0.0189511906, 0.0936351866, 0.0219314191, -0.0324258953, 0.0279682893, -0.0451873839, 0.0118699661, 0.0657687858, -0.0304390769, -0.1197185442, -0.012519503, -0.1002069712, -0.0145063214, -0.0438883081, -0.0706594139, -0.1286846995, -0.0937370732, -0.0122711509, 0.0208488572, 0.0164676681, -0.0132581918, -0.0110421255, -0.0825293809, -0.0494412109, 0.0197662953, -0.0105326846, -0.0545610897, 0.1048428789, -0.0366033092, 0.005919063, -0.0250899512, 0.0568026304 ]
801.4181
Joshua N. Cooper
Joshua Cooper, Andrew Petrarca
Symmetric and Asymptotically Symmetric Permutations
13 pages, 3 tables
null
null
null
math.CO math.NT
null
We consider two related problems arising from a question of R. Graham on quasirandom phenomena in permutation patterns. A ``pattern'' in a permutation $\sigma$ is the order type of the restriction of $\sigma : [n] \to [n]$ to a subset $S \subset [n]$. First, is it possible for the pattern counts in a permutation to be exactly equal to their expected values under a uniform distribution? Attempts to address this question lead naturally to an interesting number theoretic problem: when does $k!$ divide $\binom{n}{k}$? Second, if the tensor product of a permutation with large random permutations is random-like in its pattern counts, what must the pattern counts of the original permutation be? A recursive formula is proved which uses a certain permutation ``contraction.''
[ { "version": "v1", "created": "Mon, 28 Jan 2008 03:34:26 GMT" } ]
2008-01-29T00:00:00
[ [ "Cooper", "Joshua", "" ], [ "Petrarca", "Andrew", "" ] ]
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801.4182
Albert Seaver
Albert E. Seaver
An Equation for Charge Decay Valid in Both Conductors and Insulators
10 pages, Presented at the ESA-IEJ Joint Meeting 2002, Northwestern University, Chicago, IL, 6/27-30/02. See http://www.electrostatic.com/bookstore/books/2002jointproc.htm
null
null
null
physics.class-ph physics.gen-ph
null
Gauss' law and the equation of continuity must be satisfied in all materials be they solids, liquids or gases. Most materials are classified as simple materials; i.e., their electrical properties are linear, isotropic and homogeneous. Charge transport in these simple materials should be described by a constitutive equation known as Ohm's law. When Ohm's law is combined with Gauss' law and the equation of continuity, a differential equation for volume charge density relaxation results. The usual solution to this equation shows that charge decays exponentially with a relaxation time given by the material's permittivity divided by its electrical conductivity. Experiments show that good conductors follow this exponential decay but that poor conductors (insulators) tend to follow a decay that initially is more hyperbolic than exponential. This suggests that either Ohm's law is not valid for insulator materials or that a deeper understanding of Ohm's law is needed to explain charge decay in these less than good conductors. This paper examines the latter approach and shows that, when all the free charges within a simple material are taken into account, a new unipolar charge decay equation is derived which is valid for any simple material: conductor, insulator or anywhere in between. For good conductors the equation reduces to the standard exponential law of decay. For very poor conductors it reduces to the Vellenga-Klinkenberg modified hyperbolic law with the initial decay producing the characteristic Bustin hyperbolic law of decay. Explicit definitions for a good conductor and a good insulator are obtained and are used to define the range where explicit deviations from both of these hyperbolic laws occur.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 15:44:17 GMT" } ]
2008-01-29T00:00:00
[ [ "Seaver", "Albert E.", "" ] ]
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801.4183
Mark Walker
Mark Walker (Manly Astrophysics), Leon Koopmans (Kapteyn Institute), Dan Stinebring (Oberlin College), Willem van Straten (Swinburne University)
Interstellar Holography
Submitted to MNRAS, 8 pages, 5 figures
null
10.1111/j.1365-2966.2008.13452.x
null
astro-ph
null
The dynamic spectrum of a radio pulsar is an in-line digital hologram of the ionised interstellar medium. It has previously been demonstrated that such holograms permit image reconstruction, in the sense that one can determine an approximation to the complex electric field values as a function of Doppler-shift and delay, but to date the quality of the reconstructions has been poor. Here we report a substantial improvement in the method which we have achieved by simultaneous optimisation of the thousands of coefficients that describe the electric field. For our test spectrum of PSR B0834+06 we find that the model provides an accurate representation of the data over the full 63 dB dynamic range of the observations: residual differences between model and data are noise-like. The advent of interstellar holography enables detailed quantitative investigation of the interstellar radio-wave propagation paths for a given pulsar at each epoch of observation; we illustrate this using our test data which show the scattering material to be structured and highly anisotropic. The temporal response of the medium exhibits a scattering tail out to beyond 100 microsec and a pulse arrival time measurement at this frequency and this epoch of observation would be affected by a mean delay of 15 microsec due to multipath propagation in the interstellar medium.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 03:49:28 GMT" } ]
2009-11-13T00:00:00
[ [ "Walker", "Mark", "", "Manly Astrophysics" ], [ "Koopmans", "Leon", "", "Kapteyn Institute" ], [ "Stinebring", "Dan", "", "Oberlin College" ], [ "van Straten", "Willem", "", "Swinburne University" ] ]
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801.4184
Zhong Fang
Guangtao Wang, Xi Dai, Zhong Fang
Phase Diagram of Na$_x$CoO$_2$ Studied by Gutzwiller Density Functional Theory
4 pages, 3 figures
Phys. Rev. Lett. 101, 066403 (2008)
10.1103/PhysRevLett.101.066403
null
cond-mat.str-el
null
The ground states of Na$_x$CoO$_2$ ($0.0<x<1.0$) is studied by the LDA+Gutzwiller approach, where charge transfer and orbital fluctuations are all self-consistently treated {\it ab-initio}. In contrast to previous studies, which are parameter-dependent, we characterized the phase diagram as: (1) Stoner magnetic metal for $x>0.6$ due to $a_{1g}$ van-Hove singularity near band top; (2) correlated non-magnetic metal without $e_g^{\prime}$ pockets for $0.3<x<0.6$; (3) $e_g^{\prime}$ pockets appear for $x<0.3$, and additional magnetic instability involves. Experimental quasi-particle properties is well explained, and the $a_{1g}$-$e_g^{\prime}$ anti-crossing is attributed to spin-orbital coupling.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 04:08:15 GMT" } ]
2009-11-13T00:00:00
[ [ "Wang", "Guangtao", "" ], [ "Dai", "Xi", "" ], [ "Fang", "Zhong", "" ] ]
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801.4185
Naoki Seto
Naoki Seto and Atsushi Taruya
Polarization analysis of gravitational-wave backgrounds from the correlation signals of ground-based interferometers: measuring a circular-polarization mode
27 pages
Phys.Rev.D77:103001,2008
10.1103/PhysRevD.77.103001
null
astro-ph gr-qc
null
The Stokes V parameter characterizes asymmetry of amplitudes between right- and left-handed waves, and non-vanishing value of the V parameter yields a circularly polarized signal. Cosmologically, V parameter may be a direct probe for parity violation in the universe. In this paper, we theoretically investigate a measurement of this parameter, particularly focusing on the gravitational-wave backgrounds observed via ground-based interferometers. In contrast to the traditional analysis that only considers the total amplitude (or equivalently $\Omega_{GW}$), the signal analysis including a circular-polarized mode has a rich structure due to the multi-dimensionality of target parameters. We show that, by using the network of next-generation detectors, separation between polarized and unpolarized modes can be performed with small statistical loss induced by their correlation.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 04:12:07 GMT" } ]
2008-11-26T00:00:00
[ [ "Seto", "Naoki", "" ], [ "Taruya", "Atsushi", "" ] ]
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801.4186
Norikazu Yamada
S. Aoki, H. Fukaya, S. Hashimoto, J. Noaki, T. Kaneko, H. Matsufuru, T. Onogi, N. Yamada (for the JLQCD Collaboration)
B_K with two flavors of dynamical overlap fermions
36 pages, 14 figures, comments and references added, analysis and systematic error revised, minor change in the final result. version to appear in PRD, reference corrected
Phys.Rev.D77:094503,2008
10.1103/PhysRevD.77.094503
KEK-CP-205, UTHEP-555, YITP-07-85
hep-lat
null
We present a two-flavor QCD calculation of $B_K$ on a $16^3 \times 32$ lattice at $a\sim 0.12$ fm (or equivalently $a^{-1}\sim$1.67 GeV). Both valence and sea quarks are described by the overlap fermion formulation. The matching factor is calculated non-perturbatively with the so-called RI/MOM scheme. We find that the lattice data are well described by the next-to-leading order (NLO) partially quenched chiral perturbation theory (PQChPT) up to around a half of the strange quark mass ($m_s^{\rm phys}/2$). The data at quark masses heavier than $m_s^{\rm phys}/2$ are fitted including a part of next-to-next-to-leading order terms. We obtain $B_K^{\bar{\rm MS}}(2 {\rm GeV})= 0.537(4)(40)$, where the first error is statistical and the second is an estimate of systematic uncertainties from finite volume, fixing topology, the matching factor, and the scale setting.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 17:36:39 GMT" }, { "version": "v2", "created": "Fri, 9 May 2008 01:59:47 GMT" }, { "version": "v3", "created": "Sun, 11 May 2008 09:31:19 GMT" } ]
2019-08-13T00:00:00
[ [ "Aoki", "S.", "", "for the JLQCD Collaboration" ], [ "Fukaya", "H.", "", "for the JLQCD Collaboration" ], [ "Hashimoto", "S.", "", "for the JLQCD Collaboration" ], [ "Noaki", "J.", "", "for the JLQCD Collaboration" ], [ "Kaneko", "T.", "", "for the JLQCD Collaboration" ], [ "Matsufuru", "H.", "", "for the JLQCD Collaboration" ], [ "Onogi", "T.", "", "for the JLQCD Collaboration" ], [ "Yamada", "N.", "", "for the JLQCD Collaboration" ] ]
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801.4187
Wako Aoki
Wako Aoki, Timothy C. Beers, Thirupathi Sivarani, Brian Marsteller, Young Sun Lee, Satoshi Honda, John E. Norris, Sean G. Ryan, Daniela Carollo
Carbon-Enhanced Metal-Poor Stars. III. Main-Sequence Turn-Off Stars from the SDSS/SEGUE Sample
45 pages, 10 figures, 10 tables, Astrophysical Journal, in press
Astrophys.J.678:1351-1371,2008
10.1086/533517
null
astro-ph
null
The chemical compositions of seven Carbon-Enhanced Metal-Poor (CEMP) turn-off stars are determined from high-resolution spectroscopy. Five of them are selected from the SDSS/SEGUE sample of metal-poor stars. The effective temperatures of these objects are all higher than 6000 K, while their metallicities, parametrized by [Fe/H], are all below -2. Six of our program objects exhibit high abundance ratios of barium ([Ba/H]> +1), suggesting large contributions of the products of former AGB companions via mass transfer across binary systems. Combining our results with previous studies provides a total of 20 CEMP main-sequence turn-off stars for which the abundances of carbon and at least some neutron-capture elements are determined. Inspection of the [C/H] ratios for this sample of CEMP turn-off stars show that they are generally higher than those of CEMP giants; their dispersion in this ratio is also smaller. We take these results to indicate that the carbon-enhanced material provided from the companion AGB star is preserved at the surface of turn-off stars with no significant dilution. In contrast, a large dispersion in the observed [Ba/H] is found for the sample of CEMP turn-off stars, suggesting that the efficiency of the s-process in very metal-poor AGB stars may differ greatly from star to star. Four of the six stars from the SDSS/SEGUE sample exhibit kinematics that are associated with membership in the outer-halo population, a remarkably high fraction.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 04:41:56 GMT" } ]
2009-06-23T00:00:00
[ [ "Aoki", "Wako", "" ], [ "Beers", "Timothy C.", "" ], [ "Sivarani", "Thirupathi", "" ], [ "Marsteller", "Brian", "" ], [ "Lee", "Young Sun", "" ], [ "Honda", "Satoshi", "" ], [ "Norris", "John E.", "" ], [ "Ryan", "Sean G.", "" ], [ "Carollo", "Daniela", "" ] ]
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801.4188
Markus Kriener
M. Kriener, M. Braden, H. Kierspel, D. Senff, O. Zabara, C. Zobel, and T. Lorenz
Magnetic and structural transitions in La$_{1-x}A_{1-x}$CoO$_{3}$ ($A$ = Ca, Sr, and Ba)
9 pages, 7 figures
Phys. Rev. B 79, 224104 (2009)
10.1103/PhysRevB.79.224104
null
cond-mat.str-el
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We report thermal-expansion, lattice-constant, and specific-heat data of the series La_1-xA_xCoO_3 for 0<= x <= 0.30 with A = Ca, Sr, and Ba. For the undoped compound LaCoO_3 the thermal-expansion coefficient alpha(T) exhibits a pronounced maximum around T=50K caused by a temperature-driven spin-state transition from a low-spin state of the Co^{3+$ ions at low towards a higher spin state at higher temperatures. The partial substitution of the La^{3+} ions by divalent Ca^{2+}, Sr^{2+}, or Ba^{2+} ions causes drastic changes in the macroscopic properties of LaCoO3. The large maximum in alpha(T) is suppressed and completely vanishes for x> 0.12. For A = Ca three different anomalies develop in alpha(T) with further increasing x, which are visible in specific-heat data as well. Together with temperature-dependent x-ray data we identify several phase transitions as a function of the doping concentration x and temperature. From these data we propose an extended phase diagram for La_1-xCa_xCoO_3.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 04:58:34 GMT" }, { "version": "v2", "created": "Sat, 6 Jun 2009 06:07:43 GMT" } ]
2015-05-13T00:00:00
[ [ "Kriener", "M.", "" ], [ "Braden", "M.", "" ], [ "Kierspel", "H.", "" ], [ "Senff", "D.", "" ], [ "Zabara", "O.", "" ], [ "Zobel", "C.", "" ], [ "Lorenz", "T.", "" ] ]
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801.4189
Sunandan Gangopadhyay
Chandrasekhar Chatterjee, Sunandan Gangopadhyay, Arindam Ghosh Hazra, Saurav Samanta
String non(anti)commutativity for Neveu-Schwarz boundary conditions
new references added, original article appeared in Int.J.Theor.Phys
Int.J.Theor.Phys.47:2372-2381,2008
10.1007/s10773-008-9671-8
null
hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The appearance of non(anti)commutativity in superstring theory, satisfying the Neveu-Schwarz boundary conditions is discussed in this paper. Both an open free superstring and also one moving in a background antisymmetric tensor field are analyzed to illustrate the point that string non(anti)commutativity is a consequence of the nontrivial boundary conditions. The method used here is quite different from several other approaches where boundary conditions were treated as constraints. An interesting observation of this study is that, one requires that the bosonic sector satisfies Dirichlet boundary conditions at one end and Neumann at the other in the case of the bosonic variables $X^{\mu}$ being antiperiodic. The non(anti)commutative structures derived in this paper also leads to the closure of the super constraint algebra which is essential for the internal consistency of our analysis.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 04:59:17 GMT" }, { "version": "v2", "created": "Mon, 9 Feb 2009 14:34:13 GMT" } ]
2009-02-09T00:00:00
[ [ "Chatterjee", "Chandrasekhar", "" ], [ "Gangopadhyay", "Sunandan", "" ], [ "Hazra", "Arindam Ghosh", "" ], [ "Samanta", "Saurav", "" ] ]
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801.419
Sebastian Roch
Constantinos Daskalakis, Elchanan Mossel, Sebastien Roch
Phylogenies without Branch Bounds: Contracting the Short, Pruning the Deep
null
null
null
null
q-bio.PE cs.CE cs.DS math.PR math.ST stat.TH
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We introduce a new phylogenetic reconstruction algorithm which, unlike most previous rigorous inference techniques, does not rely on assumptions regarding the branch lengths or the depth of the tree. The algorithm returns a forest which is guaranteed to contain all edges that are: 1) sufficiently long and 2) sufficiently close to the leaves. How much of the true tree is recovered depends on the sequence length provided. The algorithm is distance-based and runs in polynomial time.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 05:10:22 GMT" }, { "version": "v2", "created": "Tue, 28 Jul 2009 01:48:27 GMT" } ]
2011-09-30T00:00:00
[ [ "Daskalakis", "Constantinos", "" ], [ "Mossel", "Elchanan", "" ], [ "Roch", "Sebastien", "" ] ]
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801.4191
Leonid Rokhinson
M. Overby, A. Chernyshov, L. P. Rokhinson, X. Liu, and J. K. Furdyna
GaMnAs-based hybrid multiferroic memory device
4 pages, 5 figures
null
10.1063/1.2917481
null
cond-mat.mtrl-sci
null
A rapidly developing field of spintronics is based on the premise that substituting charge with spin as a carrier of information can lead to new devices with lower power consumption, non-volatility and high operational speed. Despite efficient magnetization detection, magnetization manipulation is primarily performed by current-generated local magnetic fields and is very inefficient. Here we report a novel non-volatile hybrid multiferroic memory cell with electrostatic control of magnetization based on strain-coupled GaMnAs ferromagnetic semiconductor and a piezoelectric material. We use the crystalline anisotropy of GaMnAs to store information in the orientation of the magnetization along one of the two easy axes, which is monitored via transverse anisotropic magnetoresistance. The magnetization orientation is switched by applying voltage to the piezoelectric material and tuning magnetic anisotropy of GaMnAs via the resulting stress field.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 16:11:06 GMT" } ]
2009-11-13T00:00:00
[ [ "Overby", "M.", "" ], [ "Chernyshov", "A.", "" ], [ "Rokhinson", "L. P.", "" ], [ "Liu", "X.", "" ], [ "Furdyna", "J. K.", "" ] ]
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801.4192
Dan Comanescu
Dan Comanescu
An Adhesion Model for the Drag Force
4 pages
null
null
null
math-ph math.MP
null
The paper present a model for the drag force between a resistive medium and a solid body using the hypothesis that the drag force is created by the adhesion of some particles of the resistive medium on the solid body's surface. The study focus on the mass evolution of the solid body.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 05:33:36 GMT" } ]
2008-01-29T00:00:00
[ [ "Comanescu", "Dan", "" ] ]
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801.4193
Takahiko Miyakawa
Kazunori Suzuki, Takahiko Miyakawa, and Toru Suzuki
p-Wave superfluid and phase separation in atomic Bose-Fermi mixture
7 pages, 6 figurs
null
10.1103/PhysRevA.77.043629
null
cond-mat.supr-con
null
We consider a system of repulsively interacting Bose-Fermi mixtures of spin polarized uniform atomic gases at zero temperature. We examine possible realization of p-wave superfluidity of fermions due to an effective attractive interaction via density fluctuations of Bose-Einstein condensate within mean-field approximation. We find the ground state of the system by direct energy comparison of p-wave superfluid and phase-separated states, and suggest an occurrence of the p-wave superfluid for a strong boson-fermion interaction regime. We study some signatures in the p-wave superfluid phase, such as anisotropic energy gap and quasi-particle energy in the axial state, that have not been observed in spin unpolarized superfluid of atomic fermions. We also show that a Cooper pair is a tightly bound state like a diatomic molecule in the strong boson-fermion coupling regime and suggest an observable indication of the p-wave superfluid in the real experiment.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 05:37:37 GMT" } ]
2009-11-13T00:00:00
[ [ "Suzuki", "Kazunori", "" ], [ "Miyakawa", "Takahiko", "" ], [ "Suzuki", "Toru", "" ] ]
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801.4194
Kohtaro Tadaki
Kohtaro Tadaki
A statistical mechanical interpretation of algorithmic information theory
31 pages, LaTeX2e, no figures
null
null
null
cs.IT cs.CC math.IT math.PR quant-ph
null
We develop a statistical mechanical interpretation of algorithmic information theory by introducing the notion of thermodynamic quantities, such as free energy, energy, statistical mechanical entropy, and specific heat, into algorithmic information theory. We investigate the properties of these quantities by means of program-size complexity from the point of view of algorithmic randomness. It is then discovered that, in the interpretation, the temperature plays a role as the compression rate of the values of all these thermodynamic quantities, which include the temperature itself. Reflecting this self-referential nature of the compression rate of the temperature, we obtain fixed point theorems on compression rate.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 17:42:27 GMT" } ]
2009-04-09T00:00:00
[ [ "Tadaki", "Kohtaro", "" ] ]
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801.4195
Hsien-Chung Kao
Hsien-chung Kao and Dan Tomino
Quasinormal Modes of Kerr Black Holes in Four and Higher Dimensions
14 pages, 7 figures
Phys.Rev.D77:127503,2008
10.1103/PhysRevD.77.127503
null
gr-qc hep-th
null
We analytically calculate to leading order the asymptotic form of quasinormal frequencies of Kerr black holes in four, five and seven dimensions. All the relevant quantities can be explicitly expressed in terms of elliptical integrals. In four dimensions, we confirm the results obtained by Keshest and Hod by comparing the analytic results to the numerical ones.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 06:09:02 GMT" } ]
2008-11-26T00:00:00
[ [ "Kao", "Hsien-chung", "" ], [ "Tomino", "Dan", "" ] ]
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801.4196
Dong Phung Van
P. V. Dong and H. N. Long
Neutrino masses and lepton flavor violation in the 3-3-1 model with right-handed neutrinos
4 pages; version to appear in Phys. Rev. D
Phys.Rev.D77:057302,2008
10.1103/PhysRevD.77.057302
KEK-TH-1223
hep-ph
null
We show that in the framework of the 3-3-1 model with right-handed neutrinos, small neutrino masses and large lepton flavor violating processes such as \mu \to 3e and \mu \to e\gamma can be obtained by just introducing an additional Higgs sextet. In the limit of vanishing of the Yukawa interaction among Higgs and lepton triplets (h^\nu = 0), the decay \mu \to 3e strongly depends on the neutrino mass patterns, but the \mu \to e\gamma almost does not. The neutrino masses are not constrained by such processes in the cases of h^\nu \neq 0.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 06:12:02 GMT" }, { "version": "v2", "created": "Tue, 19 Feb 2008 17:57:01 GMT" } ]
2008-11-26T00:00:00
[ [ "Dong", "P. V.", "" ], [ "Long", "H. N.", "" ] ]
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801.4197
Wan-Il Park
Richard Easther, John T. Giblin Jr, Eugene A. Lim, Wan-Il Park, Ewan D. Stewart
Thermal Inflation and the Gravitational Wave Background
21 pages, 4 figures; accepted for JCAP; a reference added; table reformatted
JCAP 0805:013,2008
10.1088/1475-7516/2008/05/013
KAIST-TH 2008/01
astro-ph gr-qc hep-ph
null
We consider the impact of thermal inflation -- a short, secondary period of inflation that can arise in supersymmetric scenarios -- on the stochastic gravitational wave background. We show that while the primordial inflationary gravitational wave background is essentially unchanged at CMB scales, it is massively diluted at solar system scales and would be unobservable by a BBO style experiment. Conversely, bubble collisions at the end of thermal inflation can generate a new stochastic background. We calculate the likely properties of the bubbles created during this phase transition, and show that the expected amplitude and frequency of this signal would fall within the BBO range.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 06:40:25 GMT" }, { "version": "v2", "created": "Mon, 14 Apr 2008 06:34:17 GMT" }, { "version": "v3", "created": "Tue, 29 Apr 2008 15:40:25 GMT" } ]
2009-06-23T00:00:00
[ [ "Easther", "Richard", "" ], [ "Giblin", "John T.", "Jr" ], [ "Lim", "Eugene A.", "" ], [ "Park", "Wan-Il", "" ], [ "Stewart", "Ewan D.", "" ] ]
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801.4198
Kazutaka Nakamura
Kazutaka Nakamura, Toshiyuki Tanaka
Microscopic Analysis for Decoupling Principle of Linear Vector Channel
null
null
null
null
cs.IT math.IT
null
This paper studies the decoupling principle of a linear vector channel, which is an extension of CDMA and MIMO channels. We show that the scalar-channel characterization obtained via the decoupling principle is valid not only for collections of a large number of elements of input vector, as discussed in previous studies, but also for individual elements of input vector, i.e. the linear vector channel for individual elements of channel input vector is decomposed into a bank of independent scalar Gaussian channels in the large-system limit, where dimensions of channel input and output are both sent to infinity while their ratio fixed.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 06:59:42 GMT" } ]
2008-01-29T00:00:00
[ [ "Nakamura", "Kazutaka", "" ], [ "Tanaka", "Toshiyuki", "" ] ]
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801.4199
Nikolai Kolachevsky
J. Alnis, A. Matveev, N. Kolachevsky, T. Wilken, Th. Udem, and T.W. Haensch
Sub-Hz line width diode lasers by stabilization to vibrationally and thermally compensated ULE Fabry-Perot cavities
submitted to Applied Physics B
Phys. Rev. A 77, 053809 (2008)
10.1103/PhysRevA.77.053809
null
physics.optics
null
We achieved a 0.5 Hz optical beat note line width with ~ 0.1 Hz/s frequency drift at 972 nm between two external cavity diode lasers independently stabilized to two vertically mounted Fabry-Perot (FP) reference cavities. Vertical FP reference cavities are suspended in mid-plane such that the influence of vertical vibrations to the mirror separation is significantly suppressed. This makes the setup virtually immune for vertical vibrations that are more difficult to isolate than the horizontal vibrations. To compensate for thermal drifts the FP spacers are made from Ultra-Low-Expansion (ULE) glass which possesses a zero linear expansion coefficient. A new design using Peltier elements in vacuum allows operation at an optimal temperature where the quadratic temperature expansion of the ULE could be eliminated as well. The measured linear drift of such ULE FP cavity of 63 mHz/s was due to material aging and the residual frequency fluctuations were less than 40 Hz during 16 hours of measurement. Some part of the temperature-caused drift is attributed to the thermal expansion of the mirror coatings. High-frequency thermal fluctuations that cause vibrations of the mirror surfaces limit the stability of a well designed reference cavity. By comparing two similar laser systems we obtain an Allan instability of 2*10-15 between 0.1 and 10 s averaging time, which is close to the theoretical thermal noise limit.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 07:12:57 GMT" } ]
2009-11-13T00:00:00
[ [ "Alnis", "J.", "" ], [ "Matveev", "A.", "" ], [ "Kolachevsky", "N.", "" ], [ "Wilken", "T.", "" ], [ "Udem", "Th.", "" ], [ "Haensch", "T. W.", "" ] ]
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801.42
Bianca Keilhauer
B. Keilhauer, J. Bluemer, R. Engel, H. O. Klages
Altitude dependence of fluorescence light emission by extensive air showers
8 pages, 18 figures, to be published in Proc. 5th Fluorescence Workshop, El Escorial - Madrid, Sept. 2007
Nucl.Instrum.Meth.A597:99-104,2008
10.1016/j.nima.2008.08.060
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Fluorescence light is induced by extensive air showers while developing in the Earth's atmosphere. The number of emitted fluorescence photons depends on the conditions of the air and on the energy deposited by the shower particles at every stage of the development. In a previous model calculation, the pressure and temperature dependences of the fluorescence yield have been studied on the basis of kinetic gas theory, assuming temperature-independent molecular collision cross-sections. In this work we investigate the importance of temperature-dependent collision cross-sections and of water vapour quenching on the expected fluorescence yield. The calculations will be applied to simulated air showers while using actual atmospheric profiles to estimate the influence on the reconstructed energy of extensive air showers.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 07:41:00 GMT" }, { "version": "v2", "created": "Thu, 13 Mar 2008 11:19:03 GMT" }, { "version": "v3", "created": "Tue, 3 Jun 2008 14:07:02 GMT" }, { "version": "v4", "created": "Mon, 16 Jun 2008 14:18:14 GMT" } ]
2008-12-18T00:00:00
[ [ "Keilhauer", "B.", "" ], [ "Bluemer", "J.", "" ], [ "Engel", "R.", "" ], [ "Klages", "H. O.", "" ] ]
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801.4201
Carole Heritier
F. Lacour (FEMTO-ST/Lopmd), N. Courjal (FEMTO-ST/Lopmd), M.P. Bernal (FEMTO-ST/Lopmd), A. Sabac (FEMTO-ST/Lopmd), C. Bainier (FEMTO-ST/Lopmd), M. Spajer (FEMTO-ST/Lopmd)
Nanostructuring lithium niobate substrates by focused ion beam milling
null
Optical Materials 27 (2005) 1421-1425
10.1016/j.optmat.2004.07.016
null
physics.optics
null
We report on two novel ways for patterning Lithium Niobate (LN) at submicronic scale by means of focused ion beam (FIB) bombardment. The first method consists of direct FIB milling on LiNbO3 and the second one is a combination of FIB milling on a deposited metallic layer and subsequent RIE (Reactive Ion Etching) etching. FIB images show in both cases homogeneous structures with well reproduced periodicity. These methods open the way to the fabrication of photonic crystals on LiNbO3 substrates.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 07:32:26 GMT" } ]
2008-01-29T00:00:00
[ [ "Lacour", "F.", "", "FEMTO-ST/Lopmd" ], [ "Courjal", "N.", "", "FEMTO-ST/Lopmd" ], [ "Bernal", "M. P.", "", "FEMTO-ST/Lopmd" ], [ "Sabac", "A.", "", "FEMTO-ST/Lopmd" ], [ "Bainier", "C.", "", "FEMTO-ST/Lopmd" ], [ "Spajer", "M.", "", "FEMTO-ST/Lopmd" ] ]
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801.4202
Jeppe C. Dyre
Tage Christensen and Jeppe C. Dyre
Solution of the spherically symmetric linear thermoviscoelastic problem in the inertia-free limit
null
Phys. Rev. E 78, 021501 (2008).
10.1103/PhysRevE.78.021501
null
cond-mat.soft
null
The coupling between mechanical and thermal properties due to thermal expansion complicates the problem of measuring frequency-dependent thermoviscoelastic properties, in particular for highly viscous liquids. A simplification arises if there is spherical symmetry where - as detailed in the present paper - the thermoviscoelastic problem may be solved analytically in the inertia-free limit, i.e., the limit where the sample is much smaller than the wavelength of sound waves at the frequencies of interest. As for the one-dimensional thermoviscoelastic problem [Christensen et al., Phys. Rev. E 75, 041502 (2007)], the solution is conveniently formulated in terms of the so-called transfer matrix, which directly links to the boundary conditions that can be experimentally controlled. Once the transfer matrix has been calculated, it is fairly easy to deduce the equations describing various experimentally relevant special cases (boundary conditions that are adiabatic, isothermal, isochoric, etc.). In most situations the relevant frequency-dependent specific heat is the longitudinal specific heat, a quantity that is in between the isochoric and isobaric frequency-dependent specific heats.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 19:48:48 GMT" }, { "version": "v2", "created": "Sat, 17 May 2008 19:47:21 GMT" } ]
2009-11-13T00:00:00
[ [ "Christensen", "Tage", "" ], [ "Dyre", "Jeppe C.", "" ] ]
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801.4203
Kei-Ichi Kondo
Kei-Ichi Kondo and Akihiro Shibata
Proving Abelian dominance in the Wilson loop operator
23 pages, no figures
null
null
CHIBA-EP-170, KEK Preprint 2007-73
hep-th hep-lat hep-ph
null
We give a gauge-independent definition of Abelian dominance in the Wilson loop operator and a constructive proof of the Abelian dominance through a non-Abelian Stokes theorem via lattice regularization. We obtain a necessary and sufficient condition for the Abelian dominance in the Wilson loop operator in the fundamental representation. In the continuum limit, the gauge field is decomposed such that the Abelian dominance is given as an exact operator relation, leading to the exact (100%) Abelian dominance. On a lattice, we estimate the deviation from the exact Abelian dominance due to non-zero lattice spacing. In order to obtain the best Abelian dominance on a lattice by minimizing the deviation, we discuss how to decompose the gauge field variable into the dominant part and the remaining one to be decoupled on a lattice.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 08:23:27 GMT" } ]
2008-01-29T00:00:00
[ [ "Kondo", "Kei-Ichi", "" ], [ "Shibata", "Akihiro", "" ] ]
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801.4204
Katharina Janzen
K. Janzen, A. K. Hartmann, and A. Engel
Replica theory for Levy spin glasses
12 pages, 2 figures, to appear in JSTAT
J. Stat. Mech. (2008) P04006
10.1088/1742-5468/2008/04/P04006
null
cond-mat.dis-nn
null
Infinite-range spin-glass models with Levy-distributed interactions show a spin-glass transition with similarities to both the Sherrington-Kirkpatrick model and to disordered spin systems on finite connectivity random graphs. Despite the diverging moments of the coupling distribution the transition can be analyzed within the replica approach by working at imaginary temperature. Within the replica-symmetric approximation a self-consistent equation for the distribution of local fields is derived and from the instability of the paramagnetic solution to this equation the glass-transition temperature is determined. The role of the percolation of rare strong bonds for the transition is elucidated. The results partly agree and partly disagree with those obtained within the cavity approach. Numerical simulations using parallel tempering are in agreement with the transition temperatures found.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 08:28:43 GMT" } ]
2009-11-13T00:00:00
[ [ "Janzen", "K.", "" ], [ "Hartmann", "A. K.", "" ], [ "Engel", "A.", "" ] ]
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801.4205
Jun Nishimura
Jun Nishimura, Konstantinos N. Anagnostopoulos, Masanori Hanada, Shingo Takeuchi
Putting M theory on a computer
7 pages, 3 figures, talk presented at the XXV International Symposium on Lattice Field Theory, July 30 - August 4 2007, Regensburg, Germany
PoS LAT2007:059,2007
null
null
hep-lat hep-th
null
We propose a non-lattice simulation for studying supersymmetric matrix quantum mechanics in a non-perturbative manner. In particular, our method enables us to put M theory on a computer based on its matrix formulation proposed by Banks, Fischler, Shenker and Susskind. Here we present Monte Carlo results of the same matrix model but in a different parameter region, which corresponds to the 't Hooft large-N limit at finite temperature. In the strong coupling limit the model has a dual description in terms of the N D0-brane solution in 10d type IIA supergravity. Our results provide highly nontrivial evidences for the conjectured duality. In particular, the energy (and hence the entropy) of the non-extremal black hole has been reproduced by solving directly the strongly coupled dynamics of the D0-brane effective theory.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 08:30:35 GMT" } ]
2014-11-18T00:00:00
[ [ "Nishimura", "Jun", "" ], [ "Anagnostopoulos", "Konstantinos N.", "" ], [ "Hanada", "Masanori", "" ], [ "Takeuchi", "Shingo", "" ] ]
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801.4206
Evgenii Vdovin
E.P.Vdovin, D.O.Revin
On the inheriting of the property $C_\pi$ by some normal subgroups
null
null
null
null
math.GR
null
In the paper we prove that the Hall property $C_\pi$ is inherited by normal subgroups which index is a $\pi'$-number.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 08:35:37 GMT" } ]
2008-01-29T00:00:00
[ [ "Vdovin", "E. P.", "" ], [ "Revin", "D. O.", "" ] ]
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801.4207
Betsy Jane Becker
Betsy Jane Becker
Multivariate Meta-Analysis: Contributions of Ingram Olkin
Published in at http://dx.doi.org/10.1214/07-STS239 the Statistical Science (http://www.imstat.org/sts/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Statistical Science 2007, Vol. 22, No. 3, 401-406
10.1214/07-STS239
IMS-STS-STS239
stat.ME
null
The research on meta-analysis and particularly multivariate meta-analysis has been greatly influenced by the work of Ingram Olkin. This paper documents Olkin's contributions by way of citation counts and outlines several areas of contribution by Olkin and his academic descendants. An academic family tree is provided.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 08:31:14 GMT" } ]
2009-09-29T00:00:00
[ [ "Becker", "Betsy Jane", "" ] ]
[ 0.0558215529, 0.0682207644, 0.0028629254, -0.0275091827, -0.1027076393, -0.0508016273, 0.0813227668, -0.0326295048, -0.1016032547, -0.0238571875, 0.0915634111, -0.0322781093, 0.0370219387, -0.0022464159, 0.0555203557, 0.0529601946, 0.0721865073, 0.1078279614, -0.0082138507, 0.1107395217, -0.0172434375, -0.0192263089, 0.0542653762, 0.0192514081, 0.0098265009, -0.0547171682, -0.0568757355, 0.03220281, 0.0058011496, -0.0297681484, 0.1036112309, -0.0178458299, 0.0104163419, -0.0409123786, -0.1501961201, 0.0645562187, -0.0764032379, -0.0926175937, 0.0299689453, -0.0049101128, 0.0524582043, -0.0362438485, -0.0673171803, 0.0611426719, -0.0214978233, -0.0305211376, -0.0362940505, -0.100549072, 0.0595362969, 0.1272048652, -0.0545163713, -0.0272330865, -0.0249615703, -0.1163618341, -0.0165155493, 0.1288112402, 0.0325040072, 0.0090860622, 0.0194396544, -0.0196153522, 0.0516048186, -0.0664637908, 0.0056882012, -0.0319518149, -0.1017538533, -0.0337589867, -0.1129482836, -0.0619458593, 0.0100837722, -0.0541147776, 0.0412135758, 0.0310984273, 0.000049758, 0.1132494807, -0.0754996538, -0.0686223581, -0.1546136588, -0.0247482248, -0.1226869375, 0.0240579844, 0.0830797404, 0.0829793438, 0.075750649, -0.0645060241, -0.0005953316, -0.0223010108, 0.0309980288, 0.0403601862, -0.0743952692, 0.0132651487, -0.1542120576, -0.019929098, -0.0259279069, 0.0750980601, 0.130216822, 0.0128447302, -0.0253380649, -0.077407226, 0.0029209682, 0.0375992283, -0.0670661852, -0.0233426448, 0.0155994128, -0.0105606643, -0.0017287362, 0.0136416433, 0.0196153522, -0.1312208027, -0.0564741418, 0.0198035985, -0.0904088244, 0.0522072092, -0.1119443029, -0.0499984398, 0.0156370625, -0.0684717596, -0.1571236104, 0.0604398809, -0.062598452, -0.0195024032, -0.0884008557, 0.0003868871, 0.1311204135, 0.0089417389, 0.1055187955, 0.039180506, -0.0788630024, 0.0052175834, 0.0264800973, -0.0654096082, -0.0130141526, 0.0031939265, 0.0303705391, 0.0631004423, -0.0424936563, 0.0488940589, -0.0121670403, 0.0492956527, -0.0811219662, -0.0452044122, -0.0386283137, -0.0013130239, -0.0640040264, -0.0856399015, -0.0953283533, 0.0164528005, -0.0266808942, -0.0051485593, 0.0979387164, -0.0133906463, 0.0186741166, 0.0215354729, -0.0340601839, -0.0040724133, -0.0280111749, -0.0405860841, 0.0034041358, -0.0349386707, 0.0806701779, -0.0166033972, 0.0978885144, 0.0406613834, -0.0006941613, 0.0228155535, -0.0118093705, 0.1109403148, -0.0193267073, -0.0343864784, -0.076654233, -0.0782606155, -0.0016455938, 0.0292661563, 0.0008227969, -0.0213723257, 0.0139930379, -0.0627992451, -0.1008000672, -0.0627992451, -0.0065321759, -0.0232045986, -0.0594358966, -0.0341103822, -0.0152103687, 0.0001337339, -0.0308976304, -0.027810378, -0.0720359087, 0.0876980722, -0.0194647554, 0.0300191436, 0.1277068555, 0.0323785096, 0.1163618341, 0.1006494686, 0.0897562355, -0.0400589928, -0.0042951722, 0.0261036046, -0.0427446514, -0.0059391973, 0.0882000625, -0.0186364669, 0.0516550168, -0.0345119759, -0.0235434435, -0.0211213287, 0.0081385514, -0.0196153522, -0.0620462596, -0.029190857, 0.0593355, -0.0859410986, 0.0962319374, 0.1193737909, 0.0462084003, -0.0555705577, -0.0313243233, -0.0044708694, 0.003266088, 0.0858908966, 0.0392558053, 0.0175822824, -0.0209958311, 0.0113199279, 0.0648072138, 0.0911116153, 0.0592350997, -0.0986414999, -0.0103786923, -0.0853387043, 0.099645488, 0.0422426574, -0.061443869, -0.0080820769, -0.0070906426, -0.0033947234, -0.0671163797, -0.0272330865, -0.0452546142, -0.1086311489, -0.0321777128, 0.0096884528, 0.047739476, 0.0819753557, -0.1675650626, 0.0982399061, 0.0420669615, -0.037047036, -0.1656574905, 0.0312490258, -0.0452044122, 0.1156590432, 0.0001105952, 0.031751018, 0.0366454422, 0.0347127728 ]
801.4208
Guilhem Lavaux
G. Lavaux
Lagrangian reconstruction of cosmic velocity fields
5 pages, 5 figures, contribution to the conference "Euler's Equations: 250 Years On" (see http://www.obs-nice.fr/etc7/EE250/); to be published in a special issue of Physica D containing the proceedings of that conference
Physica D237:2139-2144,2008
10.1016/j.physd.2008.02.016
null
astro-ph
null
We discuss a Lagrangian reconstruction method of the velocity field from galaxy redshift catalog that takes its root in the Euler equation. This results in a ``functional'' of the velocity field which must be minimized. This is helped by an algorithm solving the minimization of cost-flow problems. The results obtained by applying this method to cosmological problems are shown and boundary effects happening in real observational cases are then discussed. Finally, a statistical model of the errors made by the reconstruction method is proposed.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 08:39:28 GMT" } ]
2009-06-23T00:00:00
[ [ "Lavaux", "G.", "" ] ]
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801.4209
Antti Rasila
Antti Rasila, Matti Vuorinen
Experiments with moduli of quadrilaterals II
null
Proceedings of the International Conference on Geometric Function Theory, Special Functions and Applications (ICGFT) (Ed.: R.W. Barnard and S. Ponnusamy) J. Analysis Volume 15 (2007), 229-237
null
null
math.NA math.CV
null
The numerical performance of the AFEM method of K. Samuelsson is studied in the computation of moduli of quadrilaterals.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 08:41:54 GMT" } ]
2008-01-29T00:00:00
[ [ "Rasila", "Antti", "" ], [ "Vuorinen", "Matti", "" ] ]
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801.421
Philippe Andr\'e
Philippe Andr\'e, Shantanu Basu, and Shu-ichiro Inutsuka
The Formation and Evolution of Prestellar Cores
28 pages, 11 figures, Invited review to be published in "Structure Formation in Astrophysics", Ed. G. Chabrier, Cambridge University Press, 2008. (Proceedings of the Conference "Structure Formation in the Universe", held in Chamonix, May 27 - June 1, 2007)
null
null
null
astro-ph
null
Improving our understanding of the initial conditions and earliest stages of star formation is crucial to gain insight into the origin of stellar masses, multiple systems, and protoplanetary disks. We review the properties of low-mass dense cores as derived from recent millimeter/submillimeter observations of nearby molecular clouds and discuss them in the context of various contemporary scenarios for cloud core formation and evolution. None of the extreme scenarios can explain all observations. Pure laminar ambipolar diffusion has relatively long growth times for typical ionization levels and has difficulty satisfying core lifetime constraints. Purely hydrodynamic pictures have trouble accounting for the inefficiency of core formation and the detailed velocity structure of individual cores. A possible favorable scenario is a mixed model involving gravitational fragmentation of turbulent molecular clouds close to magnetic criticality. The evolution of the magnetic field and angular momentum in individual cloud cores after the onset of gravitational collapse is also discussed. In particular, we stress the importance of radiation-magnetohydrodynamical processes and resistive MHD effects during the protostellar phase. We also emphasize the role of the formation of the short-lived first (protostellar) core in providing a chance for sub-fragmentation into binary systems and triggering MHD outflows. Future submillimeter facilities such as Herschel and ALMA will soon provide major new observational constraints in this field. On the theoretical side, an important challenge for the future will be to link the formation of molecular clouds and prestellar cores in a coherent picture.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 08:54:39 GMT" } ]
2008-01-29T00:00:00
[ [ "André", "Philippe", "" ], [ "Basu", "Shantanu", "" ], [ "Inutsuka", "Shu-ichiro", "" ] ]
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801.4211
Mathieu Stoffel
M. Stoffel, A. Malachias, T. Merdzhanova, F. Cavallo, G. Isella, D. Chrastina, H. von Kaenel, A. Rastelli, O. G. Schmidt
Strain selectivity of SiGe wet chemical etchants
13 pages, 4 figures, regular paper
null
null
null
cond-mat.mtrl-sci cond-mat.other
null
We investigate the effect of strain on the etching rate of two SiGe wet etchants, namely NH4OH:H2O2 and H2O2. For both etchants, we found that there is no appreciable strain selectivity, i.e. the etching rates do not depend on the actual strain state in the SiGe films. Instead, for the NH4OH:H2O2 solution, the rates are primarily determined by the Ge content. Finally, we show that both etchants are isotropic with no preferential etching of particular facets.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 08:59:07 GMT" } ]
2008-01-29T00:00:00
[ [ "Stoffel", "M.", "" ], [ "Malachias", "A.", "" ], [ "Merdzhanova", "T.", "" ], [ "Cavallo", "F.", "" ], [ "Isella", "G.", "" ], [ "Chrastina", "D.", "" ], [ "von Kaenel", "H.", "" ], [ "Rastelli", "A.", "" ], [ "Schmidt", "O. G.", "" ] ]
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801.4212
Vyacheslav Andreevich Vdovenkov
V.A.Vdovenkov
Evidence for hyperconductivity and thermal superconductivity
14 pages, 3 figures
null
null
null
cond-mat.supr-con
null
Physical explanation of hyperconductivity and thermal superconductivity existence is done in given article on the basis of inherent atomic nuclei oscillations in atoms of materials which are connected with electrons and phonons and in accordance with the well known Bardeen-Cooper-Schrieffer superconductivity theory. It is shown that hyperconductivity is the self-supporting, independent physical phenomenon which is caused by oscillations of atomic nuclei in atoms of materials and the minimal temperature of its existence does not reach absolute zero temperature. Hyperconductivity represents the typical dynamic condition of a material with zero electrical and zero thermal resistances.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 09:03:28 GMT" } ]
2008-01-29T00:00:00
[ [ "Vdovenkov", "V. A.", "" ] ]
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801.4213
William Chaplin
William J. Chaplin and Sarbani Basu
Perspectives in Global Helioseismology, and the Road Ahead
Invited review; to appear in Solar Physics (24 pages, 6 figures)
null
10.1007/s11207-008-9136-5
null
astro-ph
null
We review the impact of global helioseismology on key questions concerning the internal structure and dynamics of the Sun, and consider the exciting challenges the field faces as it enters a fourth decade of science exploitation. We do so with an eye on the past, looking at the perspectives global helioseismology offered in its earlier phases, in particular the mid-to-late 1970s and the 1980s. We look at how modern, higher-quality, longer datasets coupled with new developments in analysis, have altered, refined, and changed some of those perspectives, and opened others that were not previously available for study. We finish by discussing outstanding challenges and questions for the field.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 09:04:06 GMT" } ]
2009-11-13T00:00:00
[ [ "Chaplin", "William J.", "" ], [ "Basu", "Sarbani", "" ] ]
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801.4214
Ingemar Bengtsson
Jan E. Aman, Stefan Aminneborg, Ingemar Bengtsson, and Narit Pidokrajt
Anti-de Sitter Quotients, Bubbles of Nothing, and Black Holes
14 pages, 3 figures. References added, one explanation improved
Gen.Rel.Grav.40:2557-2567,2008
10.1007/s10714-008-0639-z
null
hep-th
null
In 3+1 dimensions there are anti-de quotients which are black holes with toroidal event horizons. By analytic continuation of the Schwarzschild-anti-de Sitter solution (and appropriate identifications) one finds two one parameter families of spacetimes that contain these quotient black holes. One of these families consists of B-metrics ("bubbles of nothing"), the other of black hole spacetimes. All of them have vanishing conserved charges.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 09:09:20 GMT" }, { "version": "v2", "created": "Wed, 20 Feb 2008 16:54:33 GMT" } ]
2008-12-18T00:00:00
[ [ "Aman", "Jan E.", "" ], [ "Aminneborg", "Stefan", "" ], [ "Bengtsson", "Ingemar", "" ], [ "Pidokrajt", "Narit", "" ] ]
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801.4215
Alexander Krikun
A. Krikun
On two-point correlation functions in AdS/QCD
13 pages, v2 - major changes: normalization of the fields fixed
Phys.Rev.D77:126014,2008
10.1103/PhysRevD.77.126014
null
hep-th
null
In this paper we study the chiral symmetry breaking in the hard wall AdS/QCD model. We solve the equations of motion up to the second order at large momentum and obtain the first few terms in the expansion of the "left-right" correlator, which is the measure of symmetry breaking. We study the dependence on AdS radius to get the result as the series in t'Hooft constant.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 09:32:44 GMT" }, { "version": "v2", "created": "Mon, 10 Mar 2008 08:39:18 GMT" } ]
2008-11-26T00:00:00
[ [ "Krikun", "A.", "" ] ]
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801.4216
Kazuo Ghoroku
Kazuo Ghoroku and Masafumi Ishihara
Baryons with D5 Brane Vertex and k-Quarks
20 pages, 11 figures
Phys.Rev.D77:086003,2008
10.1103/PhysRevD.77.086003
FIT HE 08-01
hep-th
null
We study baryons in SU(N) gauge theories, according to the gauge/string correspondence based on IIB string theory. The D5 brane, in which $N$ fundamental strings are dissolved as a color singlet, is introduced as the baryon vertex, and its configurations are studied. We find point- and split-type of vertex. In the latter case, two cusps appears and they are connected by a flux composed of dissolved fundamental strings with a definite tension. In both cases, $N$ fundamental quarks are attached on the cusp(s) of the vertex to cancel the surface term. In the confining phase, we find that the quark in the baryon feel the potential increasing linearly with the distance from the vertex. At finite temperature and in the deconfining phase, we find a stable k-quarks "baryons", which are constructed of arbitrary number of $k(<N)$ quarks.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 09:17:49 GMT" }, { "version": "v2", "created": "Wed, 12 Mar 2008 08:34:12 GMT" } ]
2008-11-26T00:00:00
[ [ "Ghoroku", "Kazuo", "" ], [ "Ishihara", "Masafumi", "" ] ]
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801.4217
Xiangqian Guo
Xiangqian Guo, Rencai Lu and Kaiming Zhao
Classification of irreducible Harish-Chandra modules over the loop-Virasoro algebra
27
Math Forum, 23 (2011), 1029-1052
null
null
math.RT math.RA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The loop-Virasoro algebra is the Lie algebra of the tensor product of the Virasoro algebra and the Laurent polynomial algebra. This paper classifies irreducible Harish-Chandra modules over the loop-Virasoro algebra, which turn out to be highest weight modules, lowest weight modules and evaluation modules of the intermediate series (all wight spaces are 1-dimensional). As a by-product, we obtain a classification of irreducible Harish-Chandra modules over truncated Virasoro algebras. We also determine the necessary and sufficient conditions for highest weigh irreducible modules over the loop-Virasoro algebra to have all finite dimensional weight spaces, as well as the necessary and sufficient conditions for highest weigh Verma modules to be irreducible.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 09:24:11 GMT" }, { "version": "v2", "created": "Fri, 25 Jul 2008 14:13:42 GMT" } ]
2013-01-04T00:00:00
[ [ "Guo", "Xiangqian", "" ], [ "Lu", "Rencai", "" ], [ "Zhao", "Kaiming", "" ] ]
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801.4218
Nariya Kawazumi
Nariya Kawazumi
Johnson's homomorphisms and the Arakelov-Green function
null
null
null
null
math.GT math.AG
null
Let $\pi: {\mathbb C}_g \to {\mathbb M}_g$ be the universal family of compact Riemann surfaces of genus $g \geq 1$. We introduce a real-valued function on the moduli space ${\mathbb M}_g$ and compute the first and the second variations of the function. As a consequence we relate the Chern form of the relative tangent bundle $T_{{\mathbb C}_g/{\mathbb M}_g}$ induced by the Arakelov-Green function with differential forms on ${\mathbb C}_g$ induced by a flat connection whose holonomy gives Johnson's homomorphisms on the mapping class group.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 09:26:53 GMT" } ]
2008-01-29T00:00:00
[ [ "Kawazumi", "Nariya", "" ] ]
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801.4219
Michael Hauer
M.I. Gorenstein, M. Hauer
Statistical Ensembles with Fluctuating Extensive Quantities
4 pages, 2 figures
Phys.Rev.C78:041902,2008
10.1103/PhysRevC.78.041902
null
nucl-th
null
We suggest an extension of the standard concept of statistical ensembles. Namely, we introduce a class of ensembles with extensive quantities fluctuating according to an externally given distribution. As an example the influence of energy fluctuations on multiplicity fluctuations in limited segments of momentum space for a classical ultra-relativistic gas is considered.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 09:31:41 GMT" } ]
2008-11-26T00:00:00
[ [ "Gorenstein", "M. I.", "" ], [ "Hauer", "M.", "" ] ]
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801.422
Vincent Vargas
Jean Duchon (IF), Raoul Robert (IF), Vincent Vargas (CEREMADE)
Forecasting volatility with the multifractal random walk model
null
null
null
null
q-fin.ST math.PR
null
We study the problem of forecasting volatility for the multifractal random walk model. In order to avoid the ill posed problem of estimating the correlation length T of the model, we introduce a limiting object defined in a quotient space; formally, this object is an infinite range logvolatility. For this object and the non limiting object, we obtain precise prediction formulas and we apply them to the problem of forecasting volatility and pricing options with the MRW model in the absence of a reliable estimate of the average volatility and T.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 09:37:25 GMT" } ]
2008-12-10T00:00:00
[ [ "Duchon", "Jean", "", "IF" ], [ "Robert", "Raoul", "", "IF" ], [ "Vargas", "Vincent", "", "CEREMADE" ] ]
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801.4221
Barry C. Arnold
Barry C. Arnold
Majorization: Here, There and Everywhere
Published in at http://dx.doi.org/10.1214/0883423060000000097 the Statistical Science (http://www.imstat.org/sts/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Statistical Science 2007, Vol. 22, No. 3, 407-413
10.1214/0883423060000000097
IMS-STS-STS158
stat.ME
null
The appearance of Marshall and Olkin's 1979 book on inequalities with special emphasis on majorization generated a surge of interest in potential applications of majorization and Schur convexity in a broad spectrum of fields. After 25 years this continues to be the case. The present article presents a sampling of the diverse areas in which majorization has been found to be useful in the past 25 years.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 09:38:23 GMT" } ]
2008-02-08T00:00:00
[ [ "Arnold", "Barry C.", "" ] ]
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801.4222
Mukut Tripathi Dr.
Mukut Mani Tripathi
Ricci solitons in contact metric manifolds
9 pages
null
null
null
math.DG math-ph math.MP
null
In $N(k)$-contact metric manifolds and/or $(k,\mu)$-manifolds, gradient Ricci solitons, compact Ricci solitons and Ricci solitons with $V$ pointwise collinear with the structure vector field $\xi $ are studied.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 09:41:19 GMT" } ]
2008-01-29T00:00:00
[ [ "Tripathi", "Mukut Mani", "" ] ]
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801.4223
Fabiana Diotallevi
F. Diotallevi, L.Biferale, S. Chibbaro, G. Pontrelli, F. Toschi, and S. Succi
Lattice Boltzmann simulations of capillary filling: finite vapour density effects
Proceedings for DSFD 2007 Conference
null
null
null
nlin.CG
null
Numerical simulations of two-dimensional capillary filling using the pseudo-potential lattice Boltzmann model for multiphase fluids are presented, with special emphasis on the role of finite-vapour density effects. It is shown that whenever the density of the light-phase exceeds about ten percent of the dense phase, the front motion proceeds through a combined effect of capillary advection and condensation. As a result, under these conditions, the front proceeds at a higher speed as compared to the Washburn prediction. It is suggested that such an acceleration effect might be observed in experiments performed sufficiently close to critical conditions
[ { "version": "v1", "created": "Mon, 28 Jan 2008 09:52:18 GMT" } ]
2008-01-29T00:00:00
[ [ "Diotallevi", "F.", "" ], [ "Biferale", "L.", "" ], [ "Chibbaro", "S.", "" ], [ "Pontrelli", "G.", "" ], [ "Toschi", "F.", "" ], [ "Succi", "S.", "" ] ]
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801.4224
Gonzalo Garc\'ia-Donato
M.J. Bayarri and G. Garc\'ia-Donato
Generalization of Jeffreys' divergence based priors for Bayesian hypothesis testing
null
Journal of the Royal Statistical Society, Series B, (2008), vol. 70, pp. 981--1003
null
null
stat.ME
null
In this paper we introduce objective proper prior distributions for hypothesis testing and model selection based on measures of divergence between the competing models; we call them divergence based (DB) priors. DB priors have simple forms and desirable properties, like information (finite sample) consistency; often, they are similar to other existing proposals like the intrinsic priors; moreover, in normal linear models scenarios, they exactly reproduce Jeffreys-Zellner-Siow priors. Most importantly, in challenging scenarios such as irregular models and mixture models, the DB priors are well defined and very reasonable, while alternative proposals are not. We derive approximations to the DB priors as well as MCMC and asymptotic expressions for the associated Bayes factors.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 09:55:00 GMT" } ]
2009-02-27T00:00:00
[ [ "Bayarri", "M. J.", "" ], [ "García-Donato", "G.", "" ] ]
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801.4225
Fabiana Diotallevi
S. Chibbaro, L. Biferale, F. Diotallevi and S. Succi
Capillary filling using Lattice Boltzmann Equations: the case of multi-component fluids
Proceedings for DSFD 2007 Conference
null
null
null
nlin.CG
null
We present a systematic study of capillary filling for a binary fluid by using mesoscopic a lattice Boltzmann model describing a diffusive interface moving at a given contact angle with respect to the walls. We compare the numerical results at changing the ratio the typical size of the capillary, H, and the wettability of walls. Numerical results yield quantitative agreement with the Washburn law in all cases, provided the channel lenght is sufficiently larger then the interface width. We also show that in the initial stage of the filling process, transient behaviour induced by inertial effects are under control in our lattice Boltzmann equation and in good agreement with the phenomenology of capillary filling. Finally, at variance with multiphase LB simulations, velocity and pressure profiles evolve under the sole effect of capillary drive all along the channel.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 09:59:14 GMT" } ]
2008-01-29T00:00:00
[ [ "Chibbaro", "S.", "" ], [ "Biferale", "L.", "" ], [ "Diotallevi", "F.", "" ], [ "Succi", "S.", "" ] ]
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801.4226
Holger Stiele
H. Stiele, W. Pietsch, F. Haberl and M. Freyberg
Time variability of X-ray sources in the M 31 centre field
13 pages, 6 figures, accepted for publication in A&A
null
10.1051/0004-6361:20078858
null
astro-ph
null
We present an extension to our XMM-Newton X-ray source catalogue of M 31, containing 39 newly found sources. In order to classify and identify more of the sources we search for X-ray time variability in XMM-Newton archival data of the M 31 centre field. As a source list we used our extended catalogue based on observations covering the time span from June 2000 to July 2004. We then determined the flux or at least an upper limit at the source positions for each observation. Deriving the flux ratios for the different observations and searching for the maximum flux difference we determined variability factors. We also calculated the significance of the flux ratios. Using hardness ratios, X-ray variability and cross correlations with catalogues in the X-ray, optical, infrared and radio regimes, we detected three super soft source candidates, one supernova remnant and six supernova remnant candidates, one globular cluster candidate, three X-ray binaries and four X-ray binary candidates. Additionally we identified one foreground star candidate and classified fifteen sources with hard spectra, which may either be X-ray binaries or Crab-like supernova remnants in M 31 or background active galactic nuclei. The remaining five sources stay unidentified or without classification. Based on the time variability results we suggest six sources, which were formerly classified as "hard", to be X-ray binary candidates. The classification of one other source (XMMM31 J004236.7+411349) as a supernova remnant, has to be rejected due to the distinct time variability we found. We now classify this source as a foreground star.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 10:25:03 GMT" } ]
2009-11-13T00:00:00
[ [ "Stiele", "H.", "" ], [ "Pietsch", "W.", "" ], [ "Haberl", "F.", "" ], [ "Freyberg", "M.", "" ] ]
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801.4227
Massimo Papa
M.Papa and G.Giuliani
Many-body correlations and Isospin equilibration in multi-fragmentation processes
10 pages 5 figures International Workshop on Multifragmentation and related topics Caen France 4-7th November 2007
null
null
null
nucl-th
null
Isospin equilibration in multi-fragmentation processes is studied for the system $^{40}Cl+^{28}Si$ at 40 MeV/nucleon. The investigation is performed through semiclassical microscopic many-body calculations based on the CoMD-II model. The study has been developed to describe isospin equilibration processes involving the gas and liquid "phases" of the total system formed in the collision processes. The investigation of the behavior of this observable in terms of the repulsive/attractive action of the symmetry term, highlights many-body correlations which are absent in semiclassical mean-field approaches.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 10:11:29 GMT" } ]
2008-01-29T00:00:00
[ [ "Papa", "M.", "" ], [ "Giuliani", "G.", "" ] ]
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801.4228
Tord Riemann
Janusz Gluza (Silesia U.), Tord Riemann (DESY, Zeuthen)
A new treatment of mixed virtual and real IR-singularities
8 pages, latex, to appear in the proceedings of 8th International Symposium on Radiative Corrections (RADCOR 2007): Application of Quantum Field Theory to Phenomenology, Florence, Italy, 1-5 Oct 2007
PoSRADCOR2007:007,2007
null
DESY 08-007, SFB/CPP-08-08, HEPTOOLS 08-013
hep-ph
null
We discuss the determination of the infrared singularities of massive one-loop 5-point functions with Mellin-Barnes (MB) representations. Massless internal lines may lead to poles in the $\eps$ expansion of the Feynman diagram, while unresolved massless final state particles give endpoint singularities of the phase space integrals. MB integrals are an elegant tool for their common treatment. An evaluation by taking residues leads to inverse binomial sums.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 10:16:46 GMT" } ]
2009-04-14T00:00:00
[ [ "Gluza", "Janusz", "", "Silesia U." ], [ "Riemann", "Tord", "", "DESY, Zeuthen" ] ]
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801.4229
Ion Nechita
Florent Benaych-Georges (PMA), Ion Nechita (ICJ)
A permutation model for free random variables and its classical analogue
13 pages, to appear in Pacific Journal of Mathematics
Pacific Journal of Math., Vol. 242 (2009), No. 1, 33-51
10.2140/pjm.2009.242.33
null
math.PR math.OA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we generalize a permutation model for free random variables which was first proposed by Biane in \cite{biane}. We also construct its classical probability analogue, by replacing the group of permutations with the group of subsets of a finite set endowed with the symmetric difference operation. These constructions provide new discrete approximations of the respective free and classical Wiener chaos. As a consequence, we obtain explicit examples of non random matrices which are asymptotically free or independent. The moments and the free (resp. classical) cumulants of the limiting distributions are expressed in terms of a special subset of (noncrossing) pairings. At the end of the paper we present some combinatorial applications of our results.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 10:19:46 GMT" }, { "version": "v2", "created": "Wed, 19 Mar 2008 15:18:40 GMT" }, { "version": "v3", "created": "Wed, 11 Feb 2009 15:43:11 GMT" } ]
2015-02-12T00:00:00
[ [ "Benaych-Georges", "Florent", "", "PMA" ], [ "Nechita", "Ion", "", "ICJ" ] ]
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801.423
Simon Perdrix
Simon Perdrix
Quantum entanglement analysis based on abstract interpretation
13 pages
Proc. of 15th International Static Analysis Symposium (SAS 2008). LNCS 5079, pp 270-282
10.1007/978-3-540-69166-2_18
null
cs.LO cs.PL quant-ph
null
Entanglement is a non local property of quantum states which has no classical counterpart and plays a decisive role in quantum information theory. Several protocols, like the teleportation, are based on quantum entangled states. Moreover, any quantum algorithm which does not create entanglement can be efficiently simulated on a classical computer. The exact role of the entanglement is nevertheless not well understood. Since an exact analysis of entanglement evolution induces an exponential slowdown, we consider approximative analysis based on the framework of abstract interpretation. In this paper, a concrete quantum semantics based on superoperators is associated with a simple quantum programming language. The representation of entanglement, i.e. the design of the abstract domain is a key issue. A representation of entanglement as a partition of the memory is chosen. An abstract semantics is introduced, and the soundness of the approximation is proven.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 10:45:47 GMT" } ]
2008-12-08T00:00:00
[ [ "Perdrix", "Simon", "" ] ]
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801.4231
Barbara Jager
A.Bredenstein, K.Hagiwara, B.Jager
Mixed QCD-electroweak contributions to Higgs-plus-dijet production at the LHC
26 pages, 14 figures
Phys.Rev.D77:073004,2008
10.1103/PhysRevD.77.073004
KEK-TH-1222
hep-ph
null
We present a calculation of interference effects in Hjj production via gluon fusion and via vector boson fusion, respectively, beyond tree level. We reproduce results recently discussed in the literature, but go beyond this calculation by including a class of diagrams not considered previously. Special care is taken in developing a numerically stable and flexible parton level Monte-Carlo program which allows us to study cross sections and kinematic distributions within experimentally relevant selection cuts. Loop-induced interference contributions are found to exhibit kinematical distributions different in shape from vector boson fusion. Due to the small interference cross section and cancelation among different quark flavor contributions their impact on the signal process is found to be negligible in all regions of phase space, however.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 10:35:24 GMT" } ]
2008-11-26T00:00:00
[ [ "Bredenstein", "A.", "" ], [ "Hagiwara", "K.", "" ], [ "Jager", "B.", "" ] ]
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801.4232
Marc Lachieze-Rey
Marc Lachieze-Rey, Jeffrey Weeks
Orbifold construction of the modes of the Poincare dodecahedral space
null
null
10.1088/1751-8113/41/29/295209
null
math-ph astro-ph math.MP
null
We provide a new construction of the modes of the Poincare dodecahedral space S^3/I*. The construction uses the Hopf map, Maxwell's multipole vectors and orbifolds. In particular, the *235-orbifold serves as a parameter space for the modes of S^3/I* shedding new light on the geometrical significance of the dimension of each space of $k$-modes, as well as on the modes themselves.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 10:34:12 GMT" } ]
2009-11-13T00:00:00
[ [ "Lachieze-Rey", "Marc", "" ], [ "Weeks", "Jeffrey", "" ] ]
[ 0.0232571289, 0.0006901787, 0.100557141, 0.0267055538, -0.0198350269, 0.0414864011, 0.0148729803, 0.0234677196, -0.0385381281, -0.0695476383, -0.0455929227, -0.0290088914, 0.0234150719, -0.0421708226, 0.0970823914, 0.0334576257, 0.0038794787, -0.096555911, 0.0573860109, 0.1245644987, -0.0696529299, -0.0587548539, 0.0652831718, 0.0619137175, -0.0171631556, 0.1016100943, 0.0200324561, 0.0015580434, 0.1205632761, 0.0051759286, 0.0412231609, -0.0564383529, -0.039327845, -0.0101281051, -0.1052954346, 0.0026652906, -0.0902381912, 0.146781832, -0.0230465382, 0.0834992826, -0.0384591594, 0.0513841733, -0.0094173606, -0.0467511714, 0.045408655, 0.0437502526, 0.0226780046, 0.024941856, 0.0580177829, 0.0551748089, -0.0514104962, 0.0528846309, 0.1213003397, -0.0413811058, -0.1065589786, 0.0218224786, -0.0209537912, 0.0190716349, 0.0150045995, -0.0790768713, 0.0624401942, -0.0967138559, -0.0720747262, 0.0299039036, 0.0302461144, 0.0575966015, -0.0897117108, 0.0563330576, 0.0148071703, 0.1592067033, -0.0525687449, 0.1086648852, -0.0157943144, 0.0255209804, 0.0599657483, -0.0907646641, -0.0510156378, 0.1062430963, -0.0330101177, 0.0371429659, 0.0705479383, 0.061861068, 0.0401702076, 0.05191065, -0.0148598179, -0.0045474465, 0.0481726602, 0.1122449338, -0.0889746398, 0.0214276202, 0.00893695, 0.0129974056, -0.1351993382, -0.0742332786, 0.0476198606, 0.018031843, 0.0303777326, -0.0212301929, 0.0174922049, 0.0670731887, -0.0326415859, 0.0148598179, 0.0299565513, 0.069494985, 0.0886061117, 0.0635984391, 0.0249681808, 0.0123458896, -0.078760989, 0.0043006605, -0.0469880886, 0.0569121838, -0.0080945864, 0.0824463218, 0.0761812478, -0.0021700731, -0.0227043275, 0.0012207689, 0.0083183395, 0.0199139994, -0.0428025946, -0.0729170889, 0.0398543216, 0.0295616928, 0.0560698174, -0.0940814689, -0.0420128778, -0.1518360227, -0.005626725, 0.0485148728, -0.0405124202, -0.0233097766, 0.0981879905, -0.2202780545, -0.0507524014, 0.0350107327, -0.0046066754, -0.0081472341, 0.0730750337, -0.0168999173, -0.0204799622, 0.0320361368, 0.0970297456, -0.0255473051, 0.0827622116, 0.0486201681, 0.0440924652, 0.1682621092, 0.0802351236, 0.0305620003, -0.0880269855, -0.0584389679, 0.1717368513, 0.0278506428, -0.0220067464, -0.1607861221, 0.0798139423, 0.008555254, 0.0778659731, 0.0593866259, 0.0269556306, 0.0192690641, -0.0045869322, -0.0461193994, 0.0636510924, 0.0061005545, -0.1152985021, -0.0168077834, -0.1224585921, -0.0841310546, -0.0414074287, -0.0562804118, -0.0650199279, -0.0090225022, 0.0298512559, 0.0650199279, -0.0659149438, -0.0394857898, -0.0462510213, -0.049910035, 0.0185188353, 0.0550695136, 0.0061861067, 0.0363532491, -0.0057945396, 0.053779643, 0.0280612335, -0.0003232899, 0.0579651371, 0.1688938737, -0.0886587575, 0.0533058122, 0.0367744304, 0.0888693482, 0.0132409008, -0.0491729677, 0.0380116515, 0.0065381886, -0.0221910123, -0.1115078628, -0.0032641585, -0.0088119116, 0.0097332466, -0.0219672602, -0.047093384, 0.0133593585, 0.0568068884, -0.039327845, -0.0784977451, 0.0069429176, -0.0019808703, -0.0246128086, 0.0489886999, 0.0618084185, -0.0491729677, -0.0445399694, -0.0297986083, -0.0259684864, -0.006044616, 0.0993988886, -0.0202562101, 0.0561224669, 0.0601236932, 0.059228681, 0.102452457, 0.0300618466, 0.0270346031, 0.0219672602, -0.0106085148, 0.0233624242, 0.0463036671, -0.0073311948, 0.0191637687, -0.0039551598, 0.0426446497, 0.1040318906, -0.0415390506, -0.0762865394, -0.095924139, -0.0965032652, 0.0514894687, 0.0660728887, -0.0270346031, 0.0323520228, -0.0147545226, -0.0147281988, -0.0279296134, 0.0389329866, -0.0385118052, -0.1063483879, 0.0280875564, 0.0118128313, -0.0811301321, -0.0344316065, -0.0553853996, 0.1314087063 ]
801.4233
Bin Wang
Jian-Hua He, Bin Wang
Effects of the interaction between dark energy and dark matter on cosmological parameters
revised version, accepted for publication in JCAP
JCAP 0806:010,2008
10.1088/1475-7516/2008/06/010
null
astro-ph gr-qc hep-th
null
We examine the effects of possible phenomenological interactions between dark energy and dark matter on cosmological parameters and their efficiency in solving the coincidence problem. We work with two simple parameterizations of the dynamical dark energy equation of state and the constant dark energy equation of state. Using observational data coming from the new 182 Gold type Ia supernova samples, the shift parameter of the Cosmic Microwave Background given by the three-year Wilkinson Microwave Anisotropy Probe observations, and the baryon acoustic oscillation measurement from the Sloan Digital Sky Survey, we perform a statistical joint analysis of different forms of phenomenological interactions between dark energy and dark matter.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 10:38:16 GMT" }, { "version": "v2", "created": "Fri, 23 May 2008 00:37:13 GMT" } ]
2009-06-23T00:00:00
[ [ "He", "Jian-Hua", "" ], [ "Wang", "Bin", "" ] ]
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801.4234
Karl-Hermann Neeb
Karl Heinrich Hofmann, Karl-Hermann Neeb
Solvable Subgroups of Locally Compact Groups
null
null
null
null
math.GR math.DG
null
It is shown that a closed solvable subgroup of a connected Lie group is compactly generated. In particular, every discrete solvable subgroup of a connected Lie group is finitely generated. Generalizations to locally compact groups are discussed as far as they carry.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 10:40:44 GMT" } ]
2011-02-19T00:00:00
[ [ "Hofmann", "Karl Heinrich", "" ], [ "Neeb", "Karl-Hermann", "" ] ]
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801.4235
Mihail Chizhov
M. V. Chizhov, V. A. Bednyakov and J. A. Budagov
Proposal for chiral bosons search at LHC via their unique new signature
4 pages, 5 figures
Phys.Atom.Nucl.71:2096-2100,2008
10.1134/S1063778808120107
null
hep-ph hep-ex
null
The resonance production of new chiral spin-1 bosons and their detection through the Drell--Yan process at the CERN LHC is considered. Quantitative evaluations of various differential cross-sections of the chiral bosons production are made within the CalcHEP package. The new neutral chiral bosons can be observed as a Breit--Wigner resonance peak in the invariant dilepton mass distribution, as usual. However, unique new signatures of the chiral bosons exist. First, there is no Jacobian peak in the lepton transverse momentum distribution. Second, the lepton angular distribution in the Collins-Soper frame for the high on-peak invariant masses of the lepton pairs has a peculiar "swallowtail" shape.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 10:40:51 GMT" } ]
2009-01-26T00:00:00
[ [ "Chizhov", "M. V.", "" ], [ "Bednyakov", "V. A.", "" ], [ "Budagov", "J. A.", "" ] ]
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801.4236
Teruhiko Soma
Teruhiko Soma
Geometric approach to Ending Lamination Conjecture
We prove the bi-Lipschitz model theorem with respect to Minsky's original metric instead of the compressed metric used in previous version
null
null
null
math.GN math.GT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a new proof of the bi-Lipschitz model theorem, which occupies the main part of the Ending Lamination Conjecture proved by Minsky and Brock-Canary-Minsky. Our proof is done by using techniques of standard hyperbolic geometry as much as possible.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 11:15:25 GMT" }, { "version": "v2", "created": "Tue, 2 Jun 2009 06:19:40 GMT" }, { "version": "v3", "created": "Sat, 23 Jan 2010 12:05:40 GMT" } ]
2010-01-23T00:00:00
[ [ "Soma", "Teruhiko", "" ] ]
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801.4237
Scipio Cuccagna
Scipio Cuccagna
On instability of excited states of the nonlinear Schr\"odinger equation
null
null
null
null
math.AP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We introduce a new notion of linear stability for standing waves of the nonlinear Schr\"odinger equation (NLS) which requires not only that the spectrum of the linearization be real, but also that the generalized kernel be not degenerate and that the signature of all the positive eigenvalues be positive. We prove that excited states of the NLS are not linearly stable in this more restrictive sense. We then give a partial proof that this more restrictive notion of linear stability is a necessary condition to have orbital stability.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 10:46:05 GMT" }, { "version": "v2", "created": "Mon, 9 Jun 2008 09:39:28 GMT" } ]
2008-06-09T00:00:00
[ [ "Cuccagna", "Scipio", "" ] ]
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801.4238
Christoph Durr
Marek Chrobak, Christoph Durr, Mathilde Hurand and Julien Robert
Algorithms for Temperature-Aware Task Scheduling in Microprocessor Systems
null
null
null
null
cs.DS
null
We study scheduling problems motivated by recently developed techniques for microprocessor thermal management at the operating systems level. The general scenario can be described as follows. The microprocessor's temperature is controlled by the hardware thermal management system that continuously monitors the chip temperature and automatically reduces the processor's speed as soon as the thermal threshold is exceeded. Some tasks are more CPU-intensive than other and thus generate more heat during execution. The cooling system operates non-stop, reducing (at an exponential rate) the deviation of the processor's temperature from the ambient temperature. As a result, the processor's temperature, and thus the performance as well, depends on the order of the task execution. Given a variety of possible underlying architectures, models for cooling and for hardware thermal management, as well as types of tasks, this scenario gives rise to a plethora of interesting and never studied scheduling problems. We focus on scheduling real-time jobs in a simplified model for cooling and thermal management. A collection of unit-length jobs is given, each job specified by its release time, deadline and heat contribution. If, at some time step, the temperature of the system is t and the processor executes a job with heat contribution h, then the temperature at the next step is (t+h)/2. The temperature cannot exceed the given thermal threshold T. The objective is to maximize the throughput, that is, the number of tasks that meet their deadlines. We prove that, in the offline case, computing the optimum schedule is NP-hard, even if all jobs are released at the same time. In the online case, we show a 2-competitive deterministic algorithm and a matching lower bound.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 10:47:42 GMT" } ]
2008-01-29T00:00:00
[ [ "Chrobak", "Marek", "" ], [ "Durr", "Christoph", "" ], [ "Hurand", "Mathilde", "" ], [ "Robert", "Julien", "" ] ]
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801.4239
Alexander Rashkovskii
Alexander Rashkovskii
Analyticity and propagation of plurisubharmonic singularities
null
Functional Analysis and Complex Analysis. Contemporary Mathematics, Vol. 481, 137-143. AMS, 2009.
null
null
math.CV
null
A variant of Siu's analyticity theorem is proved for relative types of plurisubharmonic functions. Some results on propagation of plurisubharmonic singularities and maximality of pluricomplex Green functions with analytic singularities are derived.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 10:48:58 GMT" } ]
2010-01-14T00:00:00
[ [ "Rashkovskii", "Alexander", "" ] ]
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801.424
Clement Mouhot
Bertrand Lods, Cl\'ement Mouhot (CEREMADE), Giuseppe Toscani
Relaxation rate, diffusion approximation and Fick's law for inelastic scattering Boltzmann models
25 pages
Kinetic and related models 1, 2 (2008) 223-248
null
null
math.AP
null
We consider the linear dissipative Boltzmann equation describing inelastic interactions of particles with a fixed background. For the simplified model of Maxwell molecules first, we give a complete spectral analysis, and deduce from it the optimal rate of exponential convergence to equilibrium. Moreover we show the convergence to the heat equation in the diffusive limit and compute explicitely the diffusivity. Then for the physical model of hard spheres we use a suitable entropy functional for which we prove explicit inequality between the relative entropy and the production of entropy to get exponential convergence to equilibrium with explicit rate. The proof is based on inequalities between the entropy production functional for hard spheres and Maxwell molecules. Mathematical proof of the convergence to some heat equation in the diffusive limit is also given. From the last two points we deduce the first explicit estimates on the diffusive coefficient in the Fick's law for (inelastic hard-spheres) dissipative gases.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 11:01:31 GMT" } ]
2009-02-20T00:00:00
[ [ "Lods", "Bertrand", "", "CEREMADE" ], [ "Mouhot", "Clément", "", "CEREMADE" ], [ "Toscani", "Giuseppe", "" ] ]
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801.4241
Valentin Bonzom
Valentin Bonzom, Etera R. Livine
A Immirzi-like parameter for 3d quantum gravity
14 pages, v2: one reference added, more comments on the 3d/4d comparison
Class.Quant.Grav.25:195024,2008
10.1088/0264-9381/25/19/195024
null
gr-qc
null
We study an Immirzi-like ambiguity in three-dimensional quantum gravity. It shares some features with the Immirzi parameter of four-dimensional loop quantum gravity: it does not affect the equations of motion, but modifies the Poisson brackets and the constraint algebra at the canonical level. We focus on the length operator and show how to define it through non-commuting fluxes. We compute its spectrum and show the effect of this Immirzi-like ambiguity. Finally, we extend these considerations to 4d gravity and show how the different topological modifications of the action affect the canonical structure of loop quantum gravity.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 11:08:43 GMT" }, { "version": "v2", "created": "Mon, 2 Jun 2008 09:16:03 GMT" } ]
2008-11-26T00:00:00
[ [ "Bonzom", "Valentin", "" ], [ "Livine", "Etera R.", "" ] ]
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801.4242
Nakia Carlevaro
Nakia Carlevaro, Orchidea Maria Lecian and Giovanni Montani
Lorentz Gauge Theory and Spinor Interaction
4 pages, no figure
Int. J. Mod. Phys. A 23, 1282-1285 (2008)
10.1142/S0217751X08040238
null
hep-th gr-qc
null
A gauge theory of the Lorentz group, based on the different behavior of spinors and vectors under local transformations, is formulated in a flat space-time and the role of the torsion field within the generalization to curved space-time is briefly discussed. The spinor interaction with the new gauge field is then analyzed assuming the time gauge and stationary solutions, in the non-relativistic limit, are treated to generalize the Pauli equation.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 11:10:50 GMT" }, { "version": "v2", "created": "Tue, 15 Apr 2008 09:45:27 GMT" }, { "version": "v3", "created": "Thu, 24 Apr 2008 09:58:48 GMT" } ]
2009-03-24T00:00:00
[ [ "Carlevaro", "Nakia", "" ], [ "Lecian", "Orchidea Maria", "" ], [ "Montani", "Giovanni", "" ] ]
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801.4243
Markus Schweighofer
Markus Schweighofer
A Gr\"obner basis proof of the flat extension theorem for moment matrices
5 pages
null
null
null
math.AC math.OC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper has been withdrawn by the author since $U$ in Lemma 2 is in general not a subspace.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 11:13:25 GMT" }, { "version": "v2", "created": "Mon, 19 Jan 2009 09:40:37 GMT" } ]
2009-01-19T00:00:00
[ [ "Schweighofer", "Markus", "" ] ]
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801.4244
Masaki Kobayashi
M. Kobayashi, Y. Ishida, J. I. Hwang, G. S. Song, M. Takizawa, A. Fujimori, Y. Takeda, T. Ohkochi, T. Okane, Y. Saitoh, H. Yamagami, Amita Gupta, H. T. Cao, K. V. Rao
Hybridization between the conduction band and 3d orbitals in the oxide-based diluted magnetic semiconductor In$_{2-x}$V$_x$O$_3$
5 pages, 4 figures
Physical Review B 79, 205203 (2009)
10.1103/PhysRevB.79.205203
null
cond-mat.mtrl-sci cond-mat.str-el
null
The electronic structure of In$_{2-x}$V$_x$O$_3$ ($x=0.08$) has been investigated using photoemission spectroscopy (PES) and x-ray absorption spectroscopy (XAS). The V $2p$ core-level PES and XAS spectra revealed trivalent electronic state of the V ion, consistent with the substitution of the V ion for the In site. The V 3d partial density of states obtained by the resonant PES technique showed a sharp peak above the O $2p$ band. While the O $1s$ XAS spectrum of In$_{2-x}$V$_x$O$_3$ was similar to that of In$_2$O$_3$, there were differences in the In $3p$ and 3d XAS spectra between V-doped and pure In$_2$O$_3$. The observations give clear evidence for hybridization between the In conduction band and the V 3d orbitals in In$_{2-x}$V$_x$O$_3$.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 11:40:48 GMT" } ]
2009-05-08T00:00:00
[ [ "Kobayashi", "M.", "" ], [ "Ishida", "Y.", "" ], [ "Hwang", "J. I.", "" ], [ "Song", "G. S.", "" ], [ "Takizawa", "M.", "" ], [ "Fujimori", "A.", "" ], [ "Takeda", "Y.", "" ], [ "Ohkochi", "T.", "" ], [ "Okane", "T.", "" ], [ "Saitoh", "Y.", "" ], [ "Yamagami", "H.", "" ], [ "Gupta", "Amita", "" ], [ "Cao", "H. T.", "" ], [ "Rao", "K. V.", "" ] ]
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801.4245
Sergio Scopetta
S. Scopetta
The neutron transversity from semi-inclusive DIS off 3He
3 pages, 2 figures; Talk given at the "20th European Conference on Few-Body Problems in Physics", September 10-14, 2007, Pisa, Italy. Submitted to Few-Body Systems
Few Body Syst.44:75-78,2008
10.1007/s00601-008-0260-4
null
hep-ph
null
A calculation of nuclear effects in the extraction of neutron single spin asymmetries in semi-inclusive deep inelastic scattering off 3He is described. In the kinematics of forth-coming experiments at JLab, it is found that the nuclear effects arising within an Impulse Approximation approach are under control.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 11:19:03 GMT" } ]
2009-01-16T00:00:00
[ [ "Scopetta", "S.", "" ] ]
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801.4246
Stefania Carpano
S. Carpano, B. Altieri, A. R. King, A. Nucita, P. Leisy
XMMU J134736.6+173403: an eclipsing LMXB in quiescence or a peculiar AGN?
Accepted in A&A as a Research Note. 4 pages, 4 figures
null
10.1051/0004-6361:20079027
null
astro-ph
null
Aims. We report the discovery of a peculiar object observed serendipitously with XMM-Newton. We present its timing and spectral properties and investigate its optical counterpart. Methods. The light curve of the X-ray source, its spectrum, and the spectrum of the best optical counterpart are presented and analyzed. Results. The X-ray flux decreases by a factor of 6.5 within 1 h and stays in a low state for at least 10 h, thereby suggesting the presence of an eclipse. The spectrum is very soft, a power law with a slope of Gamma~2.8, and does not change significantly before and after the flux drop. The source is spatially coincident within few arc-seconds with a Seyfert~2 galaxy belonging to a galaxy pair. Conclusions. Although the background AGN seems the best counterpart, neither the temporal nor the spectral properties of the X-ray source are compatible with it. We investigate the possibility of having a foreground low-mass X-ray binary in quiescence, where the companion is not detected in the optical wavelength.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 11:23:58 GMT" } ]
2009-11-13T00:00:00
[ [ "Carpano", "S.", "" ], [ "Altieri", "B.", "" ], [ "King", "A. R.", "" ], [ "Nucita", "A.", "" ], [ "Leisy", "P.", "" ] ]
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801.4247
Surajit Sen
Mihir Ranjan Nath, Surajit Sen and Gautam Gangopadhyay
On the microscopic basis of Newton's law of cooling and beyond
16 pages, 1 Figure, Typos corrected
The Journal of Chemical Physics, Vol.127, 094505 (2007)
null
null
quant-ph
null
The microscopic basis of Newton's law of cooling and its modification when the difference in temperature between the system and the surroundings is very large is discussed. When the system of interest is interacting with a small bath, the effect of the dynamical evolution of the bath variables is important to find out its dynamical feedback on the system. As in the usual system-bath approach, however, the bath is finally considered to be in thermal equilibrium and thereby provides an effective generalization of the Born-Markov master equation. It is shown that the cooling at early time is faster than that predicted by Newton's law due to the dynamical feedback of the bath.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 11:32:08 GMT" } ]
2008-01-29T00:00:00
[ [ "Nath", "Mihir Ranjan", "" ], [ "Sen", "Surajit", "" ], [ "Gangopadhyay", "Gautam", "" ] ]
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801.4248
Vicente Munoz
Gil R. Cavalcanti, Marisa Fernandez, Vicente Munoz
On non-formality of a simply-connected symplectic 8-manifold
10 pages; to appear in American Institute of Physics Conference Proceedings. Proceedings of the XVI International Fall Workshop on Geometry and Physics, Lisboa 2007
in Geometry and Physics: XVI International Fall Workshop, R. L. Fernandes and R. Picken (eds.), AIP Conference Proceedings Volume 1023, pp. 82 - 92, 2008
10.1063/1.2958181
null
math.SG
null
We show an alternative construction of the first example of a simply-connected compact symplectic non-formal 8-manifold given in arXiv:math/0506449. We also give an alternative proof of its non-formality using higher order Massey products.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 11:34:31 GMT" } ]
2011-06-10T00:00:00
[ [ "Cavalcanti", "Gil R.", "" ], [ "Fernandez", "Marisa", "" ], [ "Munoz", "Vicente", "" ] ]
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801.4249
Vincent Mathieu
Vincent Mathieu
Introduction to the Pinch Technique
45 pages, lectures given at the Third Modave Summer School in Mathematical Physics, September 2007. References added
null
null
null
hep-ph
null
These notes are a short introduction to the pinch technique. We present the one-loop calculations for basic QCD Green's functions. The equivalence between the pinch technique and the background field method is explicitly shown at the one-loop level. We review the absorptive pinch technique in the last sections. These lectures are a compilation of relevant papers on this subject and are prepared for the third Modave Summer School in Mathematical Physics.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 11:43:11 GMT" }, { "version": "v2", "created": "Fri, 1 Feb 2008 14:13:26 GMT" } ]
2008-02-01T00:00:00
[ [ "Mathieu", "Vincent", "" ] ]
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801.425
Adriano Sousa A.O. Sousa
F.W.S. Lima, A.O. Sousa, M.A. Sumuor
Majority-vote model on directed Erdos-Renyi random graphs
12 pages including table and figures, to be published in Physica A
null
10.1016/j.physa.2008.01.120
null
cond-mat.stat-mech physics.soc-ph
null
Through Monte Carlo Simulation, the well-known majority-vote model has been studied with noise on directed random graphs. In order to characterize completely the observed order-disorder phase transition, the critical noise parameter $q_c$, as well as the critical exponents $beta/nu$, $gamma/nu$ and $1/nu$ have been calculated as a function of the connectivity $z$ of the random graph.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 11:50:55 GMT" } ]
2009-11-13T00:00:00
[ [ "Lima", "F. W. S.", "" ], [ "Sousa", "A. O.", "" ], [ "Sumuor", "M. A.", "" ] ]
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801.4251
Yaroslav Kartashov
Yaroslav V. Kartashov, Victor A. Vysloukh, Lluis Torner
Optical surface waves supported and controlled by thermal waves
13 pages, 4 figures, to appear in Optics Letters
Optics Letters 33, 506 (2008)
10.1364/OL.33.000506
null
physics.optics nlin.PS
null
We address the formation of optical surface waves at the very edge of semiconductor materials illuminated by modulated light beams that generate thermal waves rapidly fading in the bulk material. We find families of thresholdless surface waves which existing due to the combined action of thermally-induced refractive index modulations and instantaneous Kerr-type nonlinearity.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 11:57:47 GMT" } ]
2009-11-13T00:00:00
[ [ "Kartashov", "Yaroslav V.", "" ], [ "Vysloukh", "Victor A.", "" ], [ "Torner", "Lluis", "" ] ]
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801.4252
Dongwoo Cha
Guanghao Jin, Dongwoo Cha, Jin-Hee Yoon
Why does the recently proposed simple empirical formula for the lowest excitation energies work so well?
9 pages, 3 figures
J. Korean Phys. Soc. 52 (2008) 1164-1167
10.3938/jkps.52.1164
null
nucl-th
null
It has recently been shown that a simple empirical formula, in terms of the mass number and the valence nucleon numbers, is able to describe the main trends of the lowest excitation energies of the natural parity even multipole states up to $10^+$ in even-even nuclei throughout the entire periodic table. In an effort to understand why such a simple formula is so capable, we investigate the possibility of associating each term of the empirical formula with the specific part of the measured excitation energy graph.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 12:12:17 GMT" } ]
2015-05-13T00:00:00
[ [ "Jin", "Guanghao", "" ], [ "Cha", "Dongwoo", "" ], [ "Yoon", "Jin-Hee", "" ] ]
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801.4253
James Graham
J. Graham, A.C. Fabian, J.S. Sanders
The Weak Shock in the Core of the Perseus Cluster
12 pages, 13 figures, accepted by MNRAS
null
10.1111/j.1365-2966.2008.13027.x
null
astro-ph
null
The dissipation of energy from sound waves and weak shocks is one of the most promising mechanisms for coupling AGN activity to the surrounding intracluster medium (ICM), and so offsetting cooling in cluster cores. We present a detailed analysis of the weak shock found in deep Chandra observations of the Perseus cluster core. A comparison of the spectra either side of the shock front shows that they are very similar. By performing a deprojection analysis of a sector containing the shock, we produce temperature and density profiles across the shock front. These show no evidence for a temperature jump coincident with the density jump. To understand this result, we model the shock formation using 1D hydrodynamic simulations including models with thermal conduction and gamma < 5/3 gas. These models do not agree well with the data, suggesting that further physics is needed to explain the shock structure. We suggest that an interaction between the shock and the H-alpha filaments could have a significant effect on cooling the post-shock gas. We also calculate the thermal energy liberated by the weak shock. The total energy in the shocked region is about 3.5 times the work needed to inflate the bubbles adiabatically, and the power of the shock is around 6x10^44 erg/s per bubble, just over 10^45 erg/s in total.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 12:40:06 GMT" } ]
2009-11-13T00:00:00
[ [ "Graham", "J.", "" ], [ "Fabian", "A. C.", "" ], [ "Sanders", "J. S.", "" ] ]
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801.4254
Marco Ruggieri
H. Abuki, M. Ciminale, R.Gatto, N. D. Ippolito, G. Nardulli, M. Ruggieri
Electrical neutrality and pion modes in the two flavor PNJL model
8 pages, 8 figures, RevTeX4 style. One figure added, role of the bare quark mass clarified, some reference added. To appear on Phys. Rev. D
Phys.Rev.D78:014002,2008
10.1103/PhysRevD.78.014002
null
hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the phase diagram and the pion modes in the electrically neutral two flavor PNJL model. One of the main result of this paper is that when electrical neutrality is required, pions do not condense in the ground state of the model: the isospin chemical potential $\mu_I = -\mu_e/2$ is always smaller than the value required for pion condensation to occur. Moreover we investigate on the pions and $\sigma$ mass spectra. We find that the qualitative behavior of the masses resembles that obtained in the NJL model. We close this paper by studying the intriguing possibility that a bound state with the quantum numbers of the pions can be formed above the chiral phase transition.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 14:43:10 GMT" }, { "version": "v2", "created": "Thu, 31 Jan 2008 18:08:45 GMT" }, { "version": "v3", "created": "Thu, 12 Jun 2008 11:37:11 GMT" } ]
2008-11-26T00:00:00
[ [ "Abuki", "H.", "" ], [ "Ciminale", "M.", "" ], [ "Gatto", "R.", "" ], [ "Ippolito", "N. D.", "" ], [ "Nardulli", "G.", "" ], [ "Ruggieri", "M.", "" ] ]
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801.4255
Jori Liesenborgs
J. Liesenborgs, S. De Rijcke, H. Dejonghe, P. Bekaert
A generalisation of the mass-sheet degeneracy producing ring-like artefacts in the lens mass distribution
6 pages, accepted for publication by MNRAS
null
10.1111/j.1365-2966.2008.13026.x
null
astro-ph
null
The inversion of a gravitational lens system is, as is well known, plagued by the so-called mass-sheet degeneracy: one can always rescale the density distribution of the lens and add a constant-density mass-sheet such that the, also properly rescaled, source plane is projected onto the same observed images. For strong lensing systems, it is often claimed that this degeneracy is broken as soon as two or more sources at different redshifts are available. This is definitely true in the strict sense that it is then impossible to add a constant-density mass-sheet to the rescaled density of the lens without affecting the resulting images. However, often one can easily construct a more general mass distribution -- instead of a constant-density sheet of mass -- which gives rise to the same effect: a uniform scaling of the sources involved without affecting the observed images. We show that this can be achieved by adding one or more circularly symmetric mass distributions, each with its own center of symmetry, to the rescaled mass distribution of the original lens. As it uses circularly symmetric distributions, this procedure can lead to the introduction of ring shaped features in the mass distribution of the lens. In this paper, we show explicitly how degenerate inversions for a given strong lensing system can be constructed. It then becomes clear that many constraints are needed to effectively break this degeneracy.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 12:38:16 GMT" } ]
2009-11-13T00:00:00
[ [ "Liesenborgs", "J.", "" ], [ "De Rijcke", "S.", "" ], [ "Dejonghe", "H.", "" ], [ "Bekaert", "P.", "" ] ]
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801.4256
Wambach
P. Braun-Munzinger, J. Wambach
The Phase Diagram of Strongly-Interacting Matter
20 pages, Rev. Mod. Phys. Vol 81, (2009) 1031-1050
null
null
null
hep-ph nucl-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A fundamental question of physics is what ultimately happens to matter as it is heated or compressed. In the realm of very high temperature and density the fundamental degrees of freedom of the strong interaction, quarks and gluons, come into play and a transition from matter consisting of confined baryons and mesons to a state with 'liberated' quarks and gluons is expected. The study of the possible phases of strongly-interacting matter is at the focus of many research activities worldwide. In this article we discuss physical aspects of the phase diagram, its relation to the evolution of the early universe as well as the inner core of neutron stars. We also summarize recent progress in the experimental study of hadronic or quark-gluon matter under extreme conditions with ultrarelativistic nucleus-nucleus collisions.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 12:39:28 GMT" }, { "version": "v2", "created": "Tue, 28 Jul 2009 13:47:48 GMT" } ]
2009-07-28T00:00:00
[ [ "Braun-Munzinger", "P.", "" ], [ "Wambach", "J.", "" ] ]
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801.4257
Hossein Farajollahi
Hossein Farajollahi
Time and Dirac Observables in Friedmann Cosmologies
11 pages
Int.J.Theor.Phys.47:1479-1489,2008
10.1007/s10773-007-9628-3
null
gr-qc
null
A cosmological time variable is emerged from the Hamiltonian formulation of Friedmann model to measure the evolution of dynamical observables in the theory. A set of observables has been identified for the theory on the null hypersurfaces that its evolution is with respect to the volume clock introduced by the cosmological time variable.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 12:41:17 GMT" } ]
2008-11-26T00:00:00
[ [ "Farajollahi", "Hossein", "" ] ]
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801.4258
Petr Zasche
P. Zasche
Multiple stellar systems under photometric and astrometric analysis
90 pages, Doctoral Thesis
null
null
null
astro-ph
null
The light-time effect method, its limitations and applications were studied. A powerful combined method of simultaneous analysis of the O-C diagrams and astrometric orbit in triple eclipsing-astrometric binaries was presented. Eleven eclipsing systems were studied in detail according to their O-C diagrams (RY Aqr, BF CMi, RW Cap, TY Cap, SS Cet, RR Dra, TY Del, TZ Eri, RV Per, UZ Sge, and BO Vul). The introduced method for studying the astrometric-eclipsing binaries was applied to QS Aql, VW Cep, Zeta Phe, V505 Sgr, HT Vir, and V2388 Oph. The algorithm for such an analysis was introduced and the its limitations were discussed. The catalogue of another systems, which contain eclipsing binaries in astrometric binaries, was presented. Such systems could be useful for prospective analysis. The method itself could be easily modified for estimation of the parallax of the individual systems.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 12:53:47 GMT" } ]
2009-09-29T00:00:00
[ [ "Zasche", "P.", "" ] ]
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801.4259
Yoh Tanimoto
Yoh Tanimoto
Inclusions and positive cones of von Neumann algebras
20 pages, no figure
J. Operator Theory, Vol. 64, Issue 2 (2010), 435-452
null
null
math.OA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider cones in a Hilbert space associated to two von Neumann algebras and determine when one algebra is included in the other. If a cone is assocated to a von Neumann algebra, the Jordan structure is naturally recovered from it and we can characterize projections of the given von Neumann algebra with the structure in some special situations.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 12:52:34 GMT" }, { "version": "v2", "created": "Sun, 30 Jan 2011 13:18:48 GMT" } ]
2011-02-01T00:00:00
[ [ "Tanimoto", "Yoh", "" ] ]
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801.426
Andras Telcs
Andras Telcs
Lower bounds for transition probabilities on graphs
null
Stochastic Processes and their Applications, Volume 117, Issue 8, August 2007, Pages 1121-1136
null
null
math.PR
null
The paper presents two results. The first one provides separate conditions for the upper and lower estimate of the distribution of the exit time from balls of a random walk on a weighted graph. The main result of the paper is that the lower estimate follows from the elliptic Harnack inequality. The second result is an off-diagonal lower bound for the transition probability of the random walk.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 12:52:50 GMT" } ]
2008-01-29T00:00:00
[ [ "Telcs", "Andras", "" ] ]
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801.4261
Raji Heyrovska
Raji Heyrovska and Saraswathi Narayan
Structures of Molecules at the Atomic Level: Caffeine and Related Compounds
10 pages, Tables 1a,b, 3 figures, presented at the 10th Eurasia Conference on Chemical Sciences, Manila, Philippines, January 2008
null
null
null
physics.chem-ph physics.gen-ph
null
Recent rsearches have shown that the lengths of the chemical bonds, whether completely or partially covalent or ionic, are sums of the radii of the adjacent atoms and/or ions. On investigating the bond length data for the molecular components of nucleic acids, all were found (for the first time) to be effectively the sums of the covalent radii of the adjacent atoms. This work shows that the bond lengths in caffeine and related molecules are likewise sums of the covalent radii of C, N, O and H. This has enabled arriving at the atomic structures of these molecules, also for the first time.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 13:01:11 GMT" } ]
2008-01-29T00:00:00
[ [ "Heyrovska", "Raji", "" ], [ "Narayan", "Saraswathi", "" ] ]
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801.4262
Heinz-J\"urgen Schmidt B.
Heinz-J\"urgen Schmidt, Christian Schr\"oder, and Marshall Luban
Modulated spin waves and robust quasi-solitons in classical Heisenberg rings
null
J. Phys.: Condens. Matter 23 (2011) 386003
null
null
cond-mat.other
null
We investigate the dynamical behavior of finite rings of classical spin vectors interacting via nearest-neighbor isotropic exchange in an external magnetic field. Our approach is to utilize the solutions of a continuum version of the discrete spin equations of motion (EOM) which we derive by assuming continuous modulations of spin wave solutions of the EOM for discrete spins. This continuous EOM reduces to the Landau-Lifshitz equation in a particular limiting regime. The usefulness of the continuum EOM is demonstrated by the fact that the time-evolved numerical solutions of the discrete spin EOM closely track the corresponding time-evolved solutions of the continuum equation. Of special interest, our continuum EOM possesses soliton solutions, and we find that these characteristics are also exhibited by the corresponding solutions of the discrete EOM. The robustness of solitons is demonstrated by considering cases where initial states are truncated versions of soliton states and by numerical simulations of the discrete EOM equations when the spins are coupled to a heat bath at finite temperatures.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 13:02:42 GMT" } ]
2011-09-16T00:00:00
[ [ "Schmidt", "Heinz-Jürgen", "" ], [ "Schröder", "Christian", "" ], [ "Luban", "Marshall", "" ] ]
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801.4263
Michael Friendly
Michael Friendly
A.-M. Guerry's Moral Statistics of France: Challenges for Multivariable Spatial Analysis
Published in at http://dx.doi.org/10.1214/07-STS241 the Statistical Science (http://www.imstat.org/sts/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Statistical Science 2007, Vol. 22, No. 3, 368-399
10.1214/07-STS241
IMS-STS-STS241
stat.ME
null
Andr\'{e}-Michel Guerry's (1833) Essai sur la Statistique Morale de la France was one of the foundation studies of modern social science. Guerry assembled data on crimes, suicides, literacy and other ``moral statistics,'' and used tables and maps to analyze a variety of social issues in perhaps the first comprehensive study relating such variables. Indeed, the Essai may be considered the book that launched modern empirical social science, for the questions raised and the methods Guerry developed to try to answer them. Guerry's data consist of a large number of variables recorded for each of the d\'{e}partments of France in the 1820--1830s and therefore involve both multivariate and geographical aspects. In addition to historical interest, these data provide the opportunity to ask how modern methods of statistics, graphics, thematic cartography and geovisualization can shed further light on the questions he raised. We present a variety of methods attempting to address Guerry's challenge for multivariate spatial statistics.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 14:29:04 GMT" } ]
2009-09-29T00:00:00
[ [ "Friendly", "Michael", "" ] ]
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801.4264
Sergey Denisov
S. Denisov, S. Flach, and P. H\"anggi
Transporting cold atoms in optical lattices with ratchets: Symmetries and Mechanisms
10 pages, 4 figures
null
null
null
cond-mat.stat-mech
null
The objective of this work is to provide a general introduction into the symmetry analysis of the rachet effect using a simple, non-interacting one-particle dynamics. Despite its simplicity, this model contains all the basic aspects of classical and quantum ratchet dynamics, and may be used also as a starting point of incorporating atom-atom interactions.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 13:18:14 GMT" } ]
2008-01-29T00:00:00
[ [ "Denisov", "S.", "" ], [ "Flach", "S.", "" ], [ "Hänggi", "P.", "" ] ]
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801.4265
Philippe Ruelle
V.S. Poghosyan, V.B. Priezzhev and P. Ruelle
Jamming probabilities for a vacancy in the dimer model
19 pages, 6 figures
Phys.Rev.E77:041130,2008
10.1103/PhysRevE.77.041130
null
cond-mat.stat-mech hep-th math-ph math.MP
null
Following the recent proposal made by Bouttier et al [Phys. Rev. E 76, 041140 (2007)], we study analytically the mobility properties of a single vacancy in the close-packed dimer model on the square lattice. Using the spanning web representation, we find determinantal expressions for various observable quantities. In the limiting case of large lattices, they can be reduced to the calculation of Toeplitz determinants and minors thereof. The probability for the vacancy to be strictly jammed and other diffusion characteristics are computed exactly.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 13:19:56 GMT" } ]
2008-11-26T00:00:00
[ [ "Poghosyan", "V. S.", "" ], [ "Priezzhev", "V. B.", "" ], [ "Ruelle", "P.", "" ] ]
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801.4266
Andrew Baggaley
Andrew W. Baggaley, Carlo F. Barenghi and Anvar Shukurov
Stretching in a model of a turbulent flow
7 pages, 10 figures
null
10.1016/j.physd.2008.10.013
null
physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Using a multi-scaled, chaotic flow known as the KS model of turbulence, we investigate the dependence of Lyapunov exponents on various characteristics of the flow. We show that the KS model yields a power law relation between the Reynolds number and the maximum Lyapunov exponent, which is similar to that for a turbulent flow with the same energy spectrum. Our results show that the Lyapunov exponents are sensitive to the advection of small eddies by large eddies, which can be explained by considering the Lagrangian correlation time of the smallest scales. We also relate the number of stagnation points within a flow to the maximum Lyapunov exponent, and suggest a linear dependence between the two characteristics.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 13:34:38 GMT" }, { "version": "v2", "created": "Tue, 6 Jan 2009 10:08:35 GMT" } ]
2009-11-13T00:00:00
[ [ "Baggaley", "Andrew W.", "" ], [ "Barenghi", "Carlo F.", "" ], [ "Shukurov", "Anvar", "" ] ]
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801.4267
Yury Arlinskii
Yury Arlinskii
Iterates of the Schur class operator-valued function and their conservative realizations
null
null
null
null
math.FA math.SP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Let $\mathfrak M$ and $\mathfrak N$ be separable Hilbert spaces and let $\Theta(\lambda)$ be a function from the Schur class ${\bf S}(\mathfrak M,\mathfrak N)$ of contractive functions holomorphic on the unit disk. The operator generalization of the classical Schur algorithm associates with $\Theta$ the sequence of contractions (the Schur parameters of $\Theta$) $\Gamma_0=\Theta(0)\in \bL(\sM,\sN), \Gamma_n\in\bL(\sD_{\Gamma_{n-1}}, \sD_{\Gamma^*_{n-1}}) $ and the sequence of functions $\Theta_0 = \Theta$, $\Theta_n\in {\bf S}(\sD_{\Gamma_n},\sD_{\Gamma^*_n})$ $ n=1,...$ (the Schur iterares of $\Theta$) connected by the relations \[ \Gamma_n=\Theta_n(0), \Theta_n(\lambda) = \Gamma_n+\lambda D_{\Gamma^*_n} \Theta_{n+1}(\lambda) (I + \lambda\Gamma^*_n\Theta_{n+1} (\lambda))^{-1}D_{\Gamma_n}, |\lambda|<1. \] The function $\Theta(\lambda)\in {\bf S}(\sM,\sN)$ can be realized as the transfer function \[ \Theta(\lambda)=D+\lambda C(I-\lambda A)^{-1}B \] of a linear conservative and simple discrete-time system $\tau = {\begin{bmatrix}D & C \cr B & A\end{bmatrix}; \mathfrak M, \mathfrak N,\mathfrak H}$ with the state space $\mathfrak H$ and the input and output spaces $\mathfrak M$ and $\mathfrak N $, respectively. In this paper we give a construction of conservative and simple realizations of the Schur iterates $\Theta_n$ by means of the conservative and simple realization of $\Theta$.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 18:10:02 GMT" }, { "version": "v2", "created": "Tue, 19 Aug 2008 13:58:27 GMT" } ]
2008-08-19T00:00:00
[ [ "Arlinskii", "Yury", "" ] ]
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801.4268
Grenville Croll
Roland T. Mittermeir, Markus Clermont, Karin Hodnigg
Protecting Spreadsheets Against Fraud
16 Pages including extensive references
Proc. European Spreadsheet Risks Int. Grp. 2005 69-80 ISBN:1-902724-16-X
null
null
cs.CY cs.CR
null
Previous research on spreadsheet risks has predominantly focussed on errors inadvertently introduced by spreadsheet writers i.e. it focussed on the end-user aspects of spreadsheet development. When analyzing a faulty spreadsheet, one might not be able to determine whether a particular error (fault) has been made by mistake or with fraudulent intentions. However, the fences protecting against fraudulent errors have to be different from those shielding against inadvertent mistakes. Faults resulting from errors committed inadvertently can be prevented ab initio by tools that notify the spreadsheet writer about potential problems whereas faults that are introduced on purpose have to be discovered by auditors without the cooperation of their originators. Even worse, some spreadsheet writers will do their best to conceal fraudulent parts of their spreadsheets from auditors. In this paper we survey the available means for fraud protection by contrasting approaches suitable for spreadsheets with those known from fraud protection for conventional software.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 13:45:28 GMT" } ]
2008-03-10T00:00:00
[ [ "Mittermeir", "Roland T.", "" ], [ "Clermont", "Markus", "" ], [ "Hodnigg", "Karin", "" ] ]
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801.4269
Luciano da Fontoura Costa
Luciano da Fontoura Costa
Detecting Neuronal Communities from Beginning of Activation Patterns
9 pages, 7 figures. A working manuscript: suggestions and comments welcomed
null
null
null
physics.soc-ph cond-mat.dis-nn physics.comp-ph q-bio.NC
null
The detection of neuronal communities is addressed with basis on two important concepts from neuroscience: facilitation of neuronal firing and nearly simultaneous beginning of activation of sets of neurons. More specifically, integrate-and-fire complex neuronal networks are activated at each of their nodes, and the dissemination of activation is monitored. As the activation received by each neuron accumulates, its firing gets facilitated. The time it takes for each neuron, other than the source, to receive the first non-zero input (beginning activation time) and the time for it to produce the first spike (beginning spiking time) are identified through simulations. It is shown, with respect to two synthetic and a real-world (\emph{C. elegans}) neuronal complex networks, that the patterns of beginning activation times (and to a lesser extent also of the spiking times) tend to cluster into groups corresponding to communities of neurons in the original complex neuronal network. Such an effect is identified to be a direct consequence of the almost simultaneous activation between the nodes inside the same community in which the source of activation is placed, as well as of the respective trapping of activation implied by the integration of activiation prior to firing. Interestingly, the accumulation of activity and thresholds inside each neuron were found to be essential for constraining the initial activations within each respective community during the transient activation (no clear clusters were observed when using overall activation or spiking rates). In addition to its intrinsic value for neuroscience and structure-dynamics studies, these results confirm the importance of the consideration of transient dynamics in complex systems investigations.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 13:52:57 GMT" } ]
2008-01-29T00:00:00
[ [ "Costa", "Luciano da Fontoura", "" ] ]
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801.427
Ilya Narodetskii
I.M.Narodetskii, C.Semay, A.I.Veselov
Accuracy of Auxiliary Field Approach for Baryons
6 pages, 2 tables; published version
Eur.Phys.J.C55:403-408,2008
10.1140/epjc/s10052-008-0595-5
null
hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We provide a check of the accuracy of the auxiliary field formalism used to derive the Effective Hamiltonian for baryons in the Field Correlator Method. To this end we compare the solutions for the Effective Hamiltonian with those obtained from the solution of the Salpeter equation. Comparing these results gives a first estimate of the systematic uncertainty due to the use of the auxiliary field formalism for baryons.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 14:10:16 GMT" }, { "version": "v2", "created": "Tue, 23 Dec 2008 14:04:46 GMT" } ]
2008-12-23T00:00:00
[ [ "Narodetskii", "I. M.", "" ], [ "Semay", "C.", "" ], [ "Veselov", "A. I.", "" ] ]
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801.4271
Ramazan Sever
Sameer M. Ikhdair and Ramazan Sever
Approximate l-state solutions of the Manning-Rosen potential by the Nikiforov-Uvarov method
22 pages
null
null
null
quant-ph
null
The Schrodinger equation for the Manning-Rosen potential with the centrifugal term is solved approximately to obtain bound states energies. Additionally, the corresponding wave functions are expressed by the Jacobi polynomials. The Nikiforov-Uvarov (${\rm NU}$) method is used in the calculations. To show the accuracy of our results, we calculate the eigenvalues numerically for arbitrary quantum numbers $n$ and $l$ with two different values of the potential parameter $\alpha .$ It is shown that the results are in good agreement with the those obtained by other methods for short potential range, small $l$ and $\alpha .$ This solution reduces to two cases $l=0$ and Hulthen potential case.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 13:49:03 GMT" } ]
2008-01-29T00:00:00
[ [ "Ikhdair", "Sameer M.", "" ], [ "Sever", "Ramazan", "" ] ]
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801.4272
Anna T\'oth
A. I. Toth, G. Zarand
Dynamical correlations in the spin-half two-channel Kondo model
20 pages, 24 figures, PRB format
null
10.1103/PhysRevB.78.165130
null
cond-mat.str-el cond-mat.mes-hall
null
Dynamical correlations of various local operators are studied in the spin-half two-channel Kondo (2CK) model in the presence of channel anisotropy or external magnetic field. A conformal field theory-based scaling approach is used to predict the analytic properties of various spectral functions in the vicinity of the two-channel Kondo fixed point. These analytical results compare well with highly accurate density matrix numerical renormalization group results. The universal cross-over functions interpolating between channel-anisotropy or magnetic field-induced Fermi liquid regimes and the two-channel Kondo, non-Fermi liquid regimes are determined numerically. The boundaries of the real 2CK scaling regime are found to be rather restricted, and to depend both on the type of the perturbation and on the specific operator whose correlation function is studied. In a small magnetic field, a universal resonance is observed in the local fermion's spectral function. The dominant superconducting instability appears in the composite superconducting channel.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 20:57:53 GMT" } ]
2009-11-13T00:00:00
[ [ "Toth", "A. I.", "" ], [ "Zarand", "G.", "" ] ]
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