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801.2673
Silke Weinfurtner
Silke Weinfurtner, Piyush Jain, Matt Visser, C.W. Gardiner
Cosmological particle production in emergent rainbow spacetimes
null
Class.Quant.Grav.26:065012,2009
10.1088/0264-9381/26/6/065012
null
gr-qc
null
We investigate cosmological particle production in spacetimes where Lorentz invariance emerges in the infrared limit, but is explicitly broken in the ultraviolet regime. Our specific model focuses on the boost subgroup that supports CPT invariance and results in a momentum-dependent dispersion relation. Motivated by previous studies on spacetimes emerging from a microscopic substrate, we show how these modifications naturally lead to momentum-dependent rainbow metrics. Firstly, we investigate the possibility of reproducing cosmological particle production in spacetimes emerging from real Bose gases. We have studied the influence of non-perturbative ultraviolet corrections in time-dependent analogue spacetimes, leading to momentum-dependent emergent rainbow spacetimes. Within certain limits the analogy is sufficiently good to simulate relativistic quantum field theory in time-dependent classical backgrounds, and the quantum effects are approximately robust against the model-dependent modifications. Secondly, we analyze how significantly the particle production process deviates from the common picture. While very low-energy modes do not see the difference at all, some modes "re-enter the Hubble horizon" during the inflationary epoch, and extreme ultraviolet modes are completely insensitive to the expansion.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 02:40:21 GMT" } ]
2009-03-27T00:00:00
[ [ "Weinfurtner", "Silke", "" ], [ "Jain", "Piyush", "" ], [ "Visser", "Matt", "" ], [ "Gardiner", "C. W.", "" ] ]
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801.2674
Dany Vanbeveren
D. Vanbeveren, H. Belkus, J. Van Bever, N. Mennekens
Binary populations and stellar dynamics in young clusters
Contributed paper IAU 250: Massive Stars as Cosmic Engines
null
10.1017/S1743921308020619
null
astro-ph
null
We first summarize work that has been done on the effects of binaries on theoretical population synthesis of stars and stellar phenomena. Next, we highlight the influence of stellar dynamics in young clusters by discussing a few candidate UFOs (unconventionally formed objects) like intermediate mass black holes, Eta Carinae, Zeta Puppis, Gamma Velorum and WR 140.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 13:55:47 GMT" } ]
2009-11-13T00:00:00
[ [ "Vanbeveren", "D.", "" ], [ "Belkus", "H.", "" ], [ "Van Bever", "J.", "" ], [ "Mennekens", "N.", "" ] ]
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801.2675
Alexey Okulov Yu
A.Yu.Okulov
Angular Momentum of a Photon and Phase Conjugation
12 pages, 5 figures
J.Phys.B, v.41, 101001(2008).
10.1088/0953-4075/41/10/101001
null
nlin.PS cond-mat.soft physics.flu-dyn physics.optics quant-ph
null
Using the concept of an ideal phase-conjugating mirror we demonstrate that regardless of internal physical mechanism the phase-conjugation of a singular laser beam is accompanied by excitation within the mirror of internal waves which carry doubled angular momentum in order to match angular momentum conservation. For a Brillouin hypersound wavefront-reversal mirror this means that each elementary optical vortex belonging to a speckle pattern emits an acoustical vortex wave with doubled topological charge. The exact spatial profiles of light intensity and the intensity of hypersound in the vicinity of the phase singularity are obtained. These spiral profiles have a form of double helix which rotates with the frequency of sound. An optoacoustic experiment is proposed for visualization of the wavefront reversal of twisted optical beams and tunable twisted sound generation.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 15:10:20 GMT" }, { "version": "v2", "created": "Mon, 18 Feb 2008 16:33:48 GMT" }, { "version": "v3", "created": "Wed, 20 Feb 2008 14:14:08 GMT" }, { "version": "v4", "created": "Fri, 22 Feb 2008 16:53:45 GMT" }, { "version": "v5", "created": "Mon, 12 May 2008 13:07:28 GMT" } ]
2015-05-13T00:00:00
[ [ "Okulov", "A. Yu.", "" ] ]
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801.2676
Mark Gieles
M. Gieles (ESO/Santiago)
What determines the mass of the most massive star cluster in a galaxy: statistics, physics or disruption?
6 pages, 3 figures, to appear in ``Young Massive Star Clusters - Initial Conditions and Environments'', 2008, Astrophysics & Space Science, eds. E. Perez, R. de Grijs, R. M. Gonzalez Delgado
Astrophys.Space Sci.324:299-304,2009
10.1007/s10509-009-0102-y
null
astro-ph
null
In many different galactic environments the cluster initial mass function (CIMF) is well described by a power-law with index -2. This implies a linear relation between the mass of the most massive cluster (M_max) and the number of clusters. Assuming a constant cluster formation rate and no disruption of the most massive clusters it also means that M_max increases linearly with age when determining M_max in logarithmic age bins. We observe this increase in five out of the seven galaxies in our sample, suggesting that M_max is determined by the size of the sample. It also means that massive clusters are very stable against disruption, in disagreement with the mass independent disruption (MID) model presented at this conference. For the clusters in M51 and the Antennae galaxies the size-of-sample prediction breaks down around 10^6 M_sun, suggesting that this is a physical upper limit to the masses of star clusters in these galaxies. In this method there is a degeneracy between MID and a CIMF truncation. We show how the cluster luminosity function can serve as a tool to distinguish between the two.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 13:57:36 GMT" }, { "version": "v2", "created": "Tue, 26 Feb 2008 14:39:18 GMT" } ]
2009-12-04T00:00:00
[ [ "Gieles", "M.", "", "ESO/Santiago" ] ]
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801.2677
Dr. W. B. Vasantha Kandasamy
W.B.Vasantha Kandasamy, Florentin Smarandache, K. Amal
Super Fuzzy Matrices and Super Fuzzy Models for Social Scientists
280 pages
Published by InfoLearnQuest, Ann Arbor, United States in 2008
null
null
math.GM
null
This book introduces the concept of fuzzy super matrices and operations on them. This book will be highly useful to social scientists who wish to work with multi-expert models. Super fuzzy models using Fuzzy Cognitive Maps, Fuzzy Relational Maps, Bidirectional Associative Memories and Fuzzy Associative Memories are defined here. The authors introduce 13 multi-expert models using the notion of fuzzy supermatrices. These models are described with illustrative examples. This book has three chapters. In the first chaper, the basic concepts about super matrices and fuzzy super matrices are recalled. Chapter two introduces the notion of fuzzy super matrices adn their properties. The final chapter introduces many super fuzzy multi expert models.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 13:59:03 GMT" } ]
2008-01-18T00:00:00
[ [ "Kandasamy", "W. B. Vasantha", "" ], [ "Smarandache", "Florentin", "" ], [ "Amal", "K.", "" ] ]
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801.2678
Scipio Cuccagna
Scipio Cuccagna
On asymptotic stability in 3D of kinks for the $\phi ^4$ model
To appear on Transactions of the American Mathematical Society
null
null
null
math.AP
null
We add to a kink, which is a 1 dimensional structure, two transversal directions. We then check its asymptotic stability with respect to compactly supported perturbations in 3D and a time evolution under a Nonlinear Wave Equation (NLW). The problem is inspired by work by Jack Xin on asymptotic stability in dimension larger than 1 of fronts for reaction diffusion equations. The proof involves a separation of variables. The transversal variables are treated as in work on Nonlinear Klein Gordon Equation (NLKG) originating from Klainerman and from Shatah in a particular elaboration due to Delort and others. The longitudinal variable is treated by means of a result by Weder on dispersion for Schroedinger operators in 1D.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 14:00:38 GMT" } ]
2008-01-18T00:00:00
[ [ "Cuccagna", "Scipio", "" ] ]
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801.2679
Riccardo Faccini
Riccardo Faccini
Heavy Quarkonium Spectroscopy
7 pages, 9 postscript figures, contributed to the Proceedings of Lepton-Photon 2007
null
null
BaBar-CONF-07/35
hep-ex
null
This paper reviews the experimental status of the Heavy Quarkonium Spectroscopy and highlights the measurements that hint at the existence of a new form of quark and gluon aggregation beyond the mesons and the baryons.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 14:04:37 GMT" } ]
2008-01-18T00:00:00
[ [ "Faccini", "Riccardo", "" ] ]
[ 0.0177144986, 0.0695416108, -0.0535633788, 0.0053790342, -0.0345665365, 0.1129370257, -0.0856106207, 0.0705402493, 0.0212097373, -0.1150250882, -0.0343849659, 0.0455515683, -0.082342349, 0.0428960957, 0.006911038, 0.0564685129, -0.0458693169, 0.0316160135, 0.0535179861, 0.0532002375, -0.1480709761, -0.0882887915, 0.0247390177, 0.0326600447, -0.0911939219, -0.1132093817, -0.0187925752, -0.0030327993, 0.1093963906, -0.108397752, 0.0359964073, -0.0447118059, -0.0128120882, -0.0677712932, -0.1044031978, 0.0749887303, -0.0591012873, 0.0210168175, -0.1493419707, -0.0332047567, -0.020086268, -0.0444167517, 0.0021334568, 0.0610985681, 0.0056797611, -0.0816614553, 0.0150817232, 0.0212664772, -0.0167272072, -0.0488879308, -0.0429414883, 0.0010582171, -0.0320245475, -0.0240808241, -0.0523831695, -0.039491646, 0.0275079738, 0.0131298369, 0.0116772708, -0.0230821855, -0.0487517528, -0.0646845922, -0.0381298624, 0.0558784083, -0.1191104278, -0.0365865119, -0.0009617577, 0.0467998683, -0.0205628909, 0.0145597067, 0.0017192484, 0.0455742665, 0.0036768082, 0.037698634, -0.0227871332, -0.0400817506, 0.0403087139, -0.0685883611, 0.0024753204, -0.0161257554, 0.0105027352, 0.0448252857, -0.1103950366, -0.1326374561, -0.058874324, 0.0425556526, -0.0340899155, -0.0222878139, -0.0063039106, 0.0091806725, 0.1006809995, 0.0192578509, -0.0533364154, -0.0377440266, 0.0891512558, -0.0515207089, 0.0969587937, -0.016511593, 0.0254199095, 0.0679074749, -0.0536541641, 0.0366999954, 0.0066159852, -0.120018281, 0.0993192196, -0.0215728786, -0.0803450719, 0.017203832, -0.0042527281, -0.0719928145, 0.0295960363, -0.009146628, -0.1118476018, 0.051248353, -0.1123923138, -0.0092998287, 0.0053364788, -0.0589651093, -0.0238765571, 0.1422607005, -0.066364117, 0.0565592982, 0.0714934915, -0.0446664132, 0.0715842769, -0.0141511727, -0.000058514, -0.077167578, -0.0913301036, 0.0600545369, 0.1694055349, -0.0159668811, 0.0170109123, -0.0296641253, 0.0397186093, 0.0489787161, 0.0272810087, -0.0991376415, -0.0298910886, -0.1349070817, 0.0091976952, -0.0256695691, 0.0595552139, 0.046436727, 0.0811621398, 0.0445302352, 0.0102530746, -0.047253795, 0.1558785141, -0.0297322143, -0.0996823609, -0.0550159477, 0.0243758764, 0.0065989629, -0.0989560708, -0.1235589162, 0.0493872501, 0.009350895, -0.0887427181, -0.0004872622, 0.0320926346, 0.0258738361, -0.0016837852, -0.039491646, -0.0016852038, 0.059010502, -0.1675898284, -0.0758057982, -0.0752156973, -0.0575579368, 0.0497503951, 0.0047492106, 0.0245347507, -0.0425329544, 0.0062925625, 0.0912847072, -0.0314798355, -0.0282115601, -0.1606901437, -0.029028628, 0.0832502022, 0.0611439608, 0.0148888035, 0.0051549077, -0.0754426569, -0.0605084635, -0.036518421, 0.0732184201, 0.0528824888, 0.0315706208, -0.0950523019, 0.1814799905, 0.0105935205, 0.1062189043, 0.0144689213, -0.1150250882, 0.0346800201, 0.1248299107, 0.0734907761, -0.0794372186, -0.036518421, -0.013277363, 0.035633266, -0.0404221937, -0.0272583123, -0.0168974306, 0.145075053, 0.0037108527, -0.1155698001, -0.0181003362, 0.0107807647, 0.140444994, 0.0330004878, 0.0525647402, -0.0811167434, 0.06232417, 0.018781228, -0.0008589149, 0.0382660404, 0.0269405637, -0.0136745488, 0.0336586833, 0.0108772246, 0.0807989985, -0.0356105678, 0.0211756919, 0.0745802, -0.0005713096, 0.0170676541, -0.0155129535, 0.0310712997, -0.0198933482, -0.1128462404, 0.0599637479, 0.0039094458, 0.0534725934, 0.0166818146, -0.0098785851, -0.0081933811, -0.0534725934, -0.0129709626, -0.090104498, 0.0181343816, -0.004437136, 0.0340445228, 0.0030129401, -0.0246709287, -0.0254199095, 0.1034953445, -0.0411711745, 0.0184180867, 0.0637767389, -0.0375170633, 0.040649157, -0.0250113755, -0.015819354 ]
801.268
Thomas Gehrmann
A. Gehrmann-De Ridder, T. Gehrmann, E.W.N. Glover, G. Heinrich
Event shapes in $e^+e^-$ annhilation at NNLO
6 pages, contribution to the Proceedings of RADCOR07, Florence
PoS RADCOR2007:048,2007
null
ZU-TH 02/08, IPPP/08/02
hep-ph
null
We report first results on the calculation of NNLO corrections to event shape distributions in electron-positron annhilation. The corrections are sizeable for all variables, however their magnitude is substantially different for different observables. We observe that inclusion of the NNLO corrections yields a considerably better agreement between theory and experimental data both in shape and normalisation of the event shape distributions.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 14:05:14 GMT" } ]
2008-12-30T00:00:00
[ [ "Ridder", "A. Gehrmann-De", "" ], [ "Gehrmann", "T.", "" ], [ "Glover", "E. W. N.", "" ], [ "Heinrich", "G.", "" ] ]
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801.2681
Dr. W. B. Vasantha Kandasamy
W.B. Vasantha Kandasamy, Florentin Smarandache
New Classes of Codes for Cryptologists and Computer Scientists
206 pages
Published by InfoLearnQuest, Ann Arbor, United States in 2008
null
null
math.GM
null
In this book, we have introduced several new classes of codes to aid cryptologists and computer scientists. We have explained these codes very non-technically so that a strong mathematical foundation is not needed to understand them. This book also provides an easy method to detect and correct errors that occur during transmission. Further, some of the codes are constructed so as to mislead an intruder/ hacker. False n-codes, whole n-codes can serve this pupose. These codes can be used to ensure security in networks and safe transmission of identity. We have named a few new classes of codes after Periyar, the south-Indian social leader, to mark his services to humanity. This book is divided into three chapters. Chapter one is introductory in nature. The notion of bicodes and their generalization, and n-codes are introduced in the second chapter. Periyar linear codes are introduced in the third chapter. We have used two methods, viz. pseudo best n-approximations and n-coset leader properties to detect and correct errors.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 14:14:21 GMT" } ]
2008-01-18T00:00:00
[ [ "Kandasamy", "W. B. Vasantha", "" ], [ "Smarandache", "Florentin", "" ] ]
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801.2682
Fabian Stoeckli
Charalampos Anastasiou, Guenther Dissertori, Fabian Stoeckli, Bryan R. Webber
QCD radiation effects on the H->WW->l nu l nu signal at the LHC
16 pages, 14 figures, added references, results update
JHEP0803:017,2008
10.1088/1126-6708/2008/03/017
null
hep-ph
null
The discovery of a Standard Model Higgs boson is possible when experimental cuts are applied which increase the ratio of signal and background cross-sections. In this paper we study the pp->H->WW signal cross-section at the LHC which requires a selection of Higgs bosons with small transverse momentum. We compare predictions for the efficiency of the experimental cuts from a NNLO QCD calculation, a calculation of the resummation of logarithms in the transverse momentum of the Higgs boson at NNLL, and the event generator MC@NLO. We also investigate the impact of various jet-algorithms, the underlying event and hadronization on the signal cross-section.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 14:31:59 GMT" }, { "version": "v2", "created": "Mon, 18 Feb 2008 11:10:43 GMT" } ]
2008-11-26T00:00:00
[ [ "Anastasiou", "Charalampos", "" ], [ "Dissertori", "Guenther", "" ], [ "Stoeckli", "Fabian", "" ], [ "Webber", "Bryan R.", "" ] ]
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801.2683
Adrian Staicu
A. Staicu, G. Manukyan, and F. Mugele
Microscopic structure of electrowetting-driven transitions on superhydrophobic surfaces
9 pages, 5 figures
null
null
null
physics.flu-dyn
null
We investigate directly at the microscale the morphology of the electrowetting induced transition between the Cassie-Baxter and Wenzel states for a water droplet on a superhydrophobic surface. Our experiments demonstrate that the transition originates in a very narrow annular region near the macroscopic contact line, which is first invaded by water and causes a thin film of air to be entrapped below. At high applied voltages, a growing fraction of microscopic air-pockets collapse, resulting in a partialWenzel state. Modulations in the intensity of the light reflected from individual micro-menisci clarify that the local contact angles near the filling transition are close to the usual advancing values for contact lines on smooth surfaces.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 14:35:24 GMT" } ]
2008-01-18T00:00:00
[ [ "Staicu", "A.", "" ], [ "Manukyan", "G.", "" ], [ "Mugele", "F.", "" ] ]
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801.2684
Paolo Tanga
P. Tanga (OCA), M. Delbo (OCA, Inaf-Osservatorio Astronomico Di Torino)
Asteroid occultations today and tomorrow: toward the GAIA era
null
Astron.Astrophys.474:1015-1022,2007
10.1051/0004-6361:20077470
null
astro-ph
null
Context: Observation of star occultations is a powerful tool to determine shapes and sizes of asteroids. This is key information necessary for studying the evolution of the asteroid belt and to calibrate indirect methods of size determination, such as the models used to analyze thermal infrared observations. Up to now, the observation of asteroid occultations is an activity essentially secured by amateur astronomers equipped with small, portable equipments. However, the accuracy of the available ephemeris prevents accurate predictions of the occultation events for objects smaller than ~100 km. Aims: We investigate current limits in predictability and observability of asteroid occultations, and we study their possible evolution in the future, when high accuracy asteroid orbits and star positions (such as those expected from the mission Gaia of the European Space Agency) will be available. Methods: We use a simple model for asteroid ephemeris uncertainties and numerical algorithms for estimating the limits imposed by the instruments, assuming realistic CCD performances and asteroid size distribution, to estimate the expected occultation rate under different conditions. Results: We show that high accuracy ephemerides which will be available in the future will extend toward much smaller asteroids the possibility of observing asteroid occultations, greatly increasing the number of events and objects involved. A complete set of size measurements down to ~10 km main belt asteroids could be obtained in a few years, provided that a small network of ground-based 1m telescopes are devoted to occultation studies.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 14:38:49 GMT" } ]
2009-06-23T00:00:00
[ [ "Tanga", "P.", "", "OCA" ], [ "Delbo", "M.", "", "OCA, Inaf-Osservatorio Astronomico Di\n Torino" ] ]
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801.2685
Paolo Tanga
Jean-Fran\c{c}ois Consigli (OCA), Paolo Tanga (OCA), Carlo Comito (OCA), Daniel Hestroffer (IMCCE), Derek C. Richardson
Formes d'ast\'ero\"ides et formation de satellites : r\^ole de la r\'eaccumulation gravitationnelle
null
Comptes Rendus Physique 8:469-480, 2007
10.1016/j.crhy.2007.02.006
null
astro-ph physics.geo-ph
null
Asteroid shapes and satellites: role of gravitational reaccumulation. Following current evidences, it is widely accepted that many asteroids would be "gravitational aggregates", i.e. bodies lacking internal cohesion. They could mainly be originated during the catastrophic disruption of some parent bodies, through the gravitational reaccumulation of the resulting fragments. The same events produced the dynamical families that we observe. In this work we address the problem of the origin of shapes of gravitational aggregates, that could contain signatures of their origin. We use a N-body code to simulate the collapse of a cloud of fragments, with a variety of initial velocity distributions and total angular momentum. The fragments are treated as inhelastic spheres, that rapidly accumulate to form rotating aggregates. The resulting shapes and rotational properties are compared with theoretical predictions. The results show that only a precise category of shapes (flattened spheroids) are created via this mechanism. This may provide interesting constraints on the evolution of asteroid shapes, in particular for those with one or more satellites.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 14:42:12 GMT" } ]
2009-11-13T00:00:00
[ [ "Consigli", "Jean-François", "", "OCA" ], [ "Tanga", "Paolo", "", "OCA" ], [ "Comito", "Carlo", "", "OCA" ], [ "Hestroffer", "Daniel", "", "IMCCE" ], [ "Richardson", "Derek C.", "" ] ]
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801.2686
Andrei Smilga
A.V. Smilga
Crypto-Hermiticity of nonanticommutative theories
9 pages, 1 figure. Invited contribution to the Proceedings of the International Workshop on Supersymmetry and Quantum Symmetries, Dubna, July 30 - August 4, 2007. SQS07
null
null
null
hep-th
null
We note that, though nonanticommutative deformations of Minkowski supersymmetric theories do not respect the reality condition and seem to lead to non-Hermitian Hamiltonians H, the latter belong to the class of crypto-Hermitian (or quasi-Hermitian) Hamiltonians having attracted recently a considerable attention. They can be made manifestly Hermitian via the similarity transformation H -> e^R H e^{-R} with a properly chosen R. The deformed model enjoys the same supersymmetry algebra as the undeformed one though it is difficult in some cases to write explicit expressions for a half of supercharges. The deformed SQM models make perfect sense. It is not clear whether it is also the case for NAC Minkowski field theories -- the conventionally defined S--matrix is not unitary there.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 14:45:38 GMT" } ]
2008-01-18T00:00:00
[ [ "Smilga", "A. V.", "" ] ]
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801.2687
Denis Dujmic
D. Dujmic, S. Ahlen, P. Fisher, S. Henderson, A. Kaboth, G. Kohse, R. Lanza, M. Lewandowska, J. Monroe, A. Roccaro, G. Sciolla, N. Skvorodnev, H. Tomita, R. Vanderspek, H. Wellenstein, R. Yamamoto
Improved measurement of the head-tail effect in nuclear recoils
Contributed to the International Conference on Topics in Astroparticle and Underground Physics (TAUP) 2007, Sendai, Japan (3 pages, 4 figures)
J.Phys.Conf.Ser.120:042030,2008
10.1088/1742-6596/120/4/042030
null
astro-ph
null
We present new results with a prototype detector that is being developed by the DMTPC collaboration for the measurement of the direction tag (head-tail) of dark matter wind. We use neutrons from a Cf-252 source to create low-momentum nuclear recoils in elastic scattering with the residual gas nuclei. The recoil track is imaged in low-pressure time-projection chamber with optical readout. We measure the ionization rate along the recoil trajectory, which allows us to determine the direction tag of the incoming neutrons.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 14:46:57 GMT" } ]
2009-06-23T00:00:00
[ [ "Dujmic", "D.", "" ], [ "Ahlen", "S.", "" ], [ "Fisher", "P.", "" ], [ "Henderson", "S.", "" ], [ "Kaboth", "A.", "" ], [ "Kohse", "G.", "" ], [ "Lanza", "R.", "" ], [ "Lewandowska", "M.", "" ], [ "Monroe", "J.", "" ], [ "Roccaro", "A.", "" ], [ "Sciolla", "G.", "" ], [ "Skvorodnev", "N.", "" ], [ "Tomita", "H.", "" ], [ "Vanderspek", "R.", "" ], [ "Wellenstein", "H.", "" ], [ "Yamamoto", "R.", "" ] ]
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801.2688
Shao-Feng Wu
Shao-Feng Wu, Bin Wang, Guo-Hong Yang, Peng-Ming Zhang
The generalized second law of thermodynamics in generalized gravity theories
19 pages, no figure, mistakes corrected, references added, to appear in Class. Quantum Grav
Class.Quant.Grav.25:235018,2008
10.1088/0264-9381/25/23/235018
null
hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We investigate the generalized second law of thermodynamics (GSL) in generalized theories of gravity. We examine the total entropy evolution with time including the horizon entropy, the non-equilibrium entropy production, and the entropy of all matter, field and energy components. We derive a universal condition to protect the generalized second law and study its validity in different gravity theories. In Einstein gravity, (even in the phantom-dominated universe with a Schwarzschild black hole), Lovelock gravity, and braneworld gravity, we show that the condition to keep the GSL can always be satisfied. In $f(R)$ gravity and scalar-tensor gravity, the condition to protect the GSL can also hold because the gravity is always attractive and the effective Newton constant should be approximate constant satisfying the experimental bounds.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 14:49:25 GMT" }, { "version": "v2", "created": "Mon, 21 Apr 2008 09:04:06 GMT" }, { "version": "v3", "created": "Tue, 13 May 2008 00:52:55 GMT" }, { "version": "v4", "created": "Tue, 7 Oct 2008 05:49:36 GMT" } ]
2008-12-18T00:00:00
[ [ "Wu", "Shao-Feng", "" ], [ "Wang", "Bin", "" ], [ "Yang", "Guo-Hong", "" ], [ "Zhang", "Peng-Ming", "" ] ]
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801.2689
Diego Paz\'o
Diego Paz\'o and Ernesto M. Nicola
Breaking chirality in nonequilibrium systems on the lattice
null
Europhys. Lett. 81, 10009 (2008)
10.1209/0295-5075/81/10009
null
nlin.PS
null
We study the dynamics of fronts in parametrically forced oscillating lattices. Using as a prototypical example the discrete Ginzburg-Landau equation, we show that much information about front bifurcations can be extracted by projecting onto a cylindrical phase space. Starting from a normal form that describes the nonequilibrium Ising-Bloch bifurcation in the continuum and using symmetry arguments, we derive a simple dynamical system that captures the dynamics of fronts in the lattice. We can expect our approach to be extended to other pattern-forming problems on lattices.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 14:53:11 GMT" } ]
2008-01-18T00:00:00
[ [ "Pazó", "Diego", "" ], [ "Nicola", "Ernesto M.", "" ] ]
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801.269
Ki-Seng Tan
Ki-Seng Tan
Control Theorems for Abelian Varieties over Function Fields
13 pages
null
null
null
math.NT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We prove control theorems for abelian varieties over function fields.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 14:55:14 GMT" }, { "version": "v2", "created": "Fri, 12 Dec 2008 00:16:51 GMT" } ]
2008-12-12T00:00:00
[ [ "Tan", "Ki-Seng", "" ] ]
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801.2691
Remy Reche
R\'emy Reche (LAOG), Herv\'e Beust (LAOG), J. C. Augereau (LAOG), Olivier Absil (LAOG)
On the observability of resonant structures in planetesimal disks due to planetary migration
16 pages, 13 figures. Accepted for publication in A&A
null
10.1051/0004-6361:20077934
null
astro-ph
null
We present a thorough study of the impact of a migrating planet on a planetesimal disk, by exploring a broad range of masses and eccentricities for the planet. We discuss the sensitivity of the structures generated in debris disks to the basic planet parameters. We perform many N-body numerical simulations, using the symplectic integrator SWIFT, taking into account the gravitational influence of the star and the planet on massless test particles. A constant migration rate is assumed for the planet. The effect of planetary migration on the trapping of particles in mean motion resonances is found to be very sensitive to the initial eccentricity of the planet and of the planetesimals. A planetary eccentricity as low as 0.05 is enough to smear out all the resonant structures, except for the most massive planets. The planetesimals also initially have to be on orbits with a mean eccentricity of less than than 0.1 in order to keep the resonant clumps visible. This numerical work extends previous analytical studies and provides a collection of disk images that may help in interpreting the observations of structures in debris disks. Overall, it shows that stringent conditions must be fulfilled to obtain observable resonant structures in debris disks. Theoretical models of the origin of planetary migration will therefore have to explain how planetary systems remain in a suitable configuration to reproduce the observed structures.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 14:57:01 GMT" } ]
2009-11-13T00:00:00
[ [ "Reche", "Rémy", "", "LAOG" ], [ "Beust", "Hervé", "", "LAOG" ], [ "Augereau", "J. C.", "", "LAOG" ], [ "Absil", "Olivier", "", "LAOG" ] ]
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801.2692
Syksy Rasanen
Syksy Rasanen
Evaluating backreaction with the peak model of structure formation
49 pages, 6 figures. v2: Added clarifications and references. v3: Published version. Corrected typos
JCAP 0804:026,2008
10.1088/1475-7516/2008/04/026
null
astro-ph gr-qc
null
We evaluate the average expansion rate of a universe which contains a realistic evolving ensemble of non-linear structures. We use the peak model of structure formation to obtain the number density of structures, and take the individual structures to be spherical. The expansion rate increases relative to the FRW value on a timescale of 10-100 billion years, because the universe becomes dominated by fast-expanding voids. However, the increase is not rapid enough to correspond to acceleration. We discuss how to improve our treatment. We also consider various qualitative issues related to backreaction.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 20:18:22 GMT" }, { "version": "v2", "created": "Thu, 31 Jan 2008 19:23:53 GMT" }, { "version": "v3", "created": "Fri, 18 Apr 2008 14:21:41 GMT" } ]
2009-06-23T00:00:00
[ [ "Rasanen", "Syksy", "" ] ]
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801.2693
Hagen Neidhardt Dr
Horia Cornean, Kurt Hoke, Hagen Neidhardt, Paul N. Racec, Joachim Rehberg
A Kohn-Sham system at zero temperature
27 pages
J. Phys. A: Math. Theor. 41 385304 (2008)
10.1088/1751-8113/41/38/385304
WIAS Preprint 1293
math-ph math.MP
null
An one-dimensional Kohn-Sham system for spin particles is considered which effectively describes semiconductor {nano}structures and which is investigated at zero temperature. We prove the existence of solutions and derive a priori estimates. For this purpose we find estimates for eigenvalues of the Schr\"odinger operator with effective Kohn-Sham potential and obtain $W^{1,2}$-bounds of the associated particle density operator. Afterwards, compactness and continuity results allow to apply Schauder's fixed point theorem. In case of vanishing exchange-correlation potential uniqueness is shown by monotonicity arguments. Finally, we investigate the behavior of the system if the temperature approaches zero.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 14:59:12 GMT" } ]
2009-01-13T00:00:00
[ [ "Cornean", "Horia", "" ], [ "Hoke", "Kurt", "" ], [ "Neidhardt", "Hagen", "" ], [ "Racec", "Paul N.", "" ], [ "Rehberg", "Joachim", "" ] ]
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801.2694
Fabien Malbet
F. Malbet (LAOG), D. Buscher (MRAO), G. Weigelt, P. Garcia (CAUP), M. Gai (OATo), D. Lorenzetti (OAR), J. Surdej (IAGL), J. Hron (IfAW), R. Neuh\"auser (AIU), P. Kern (LAOG), L. Jocou (LAOG), J.-P. Berger (LAOG), O. Absil (LAOG), U. Beckmann, L. Corcione (OATo), G. Duvert (LAOG, JMMC), M. Filho (CAUP), P. Labeye (LETI), E. Le Coarer (LAOG), G. Li Causi (OAR), J. Lima (FCUL), K. Perraut (LAOG), E. Tatulli (LAOG, JMMC, Oaa), E. Thi\'ebaut (CRAL), J. Young (MRAO), G. Zins (LAOG), A. Amorim (FCUL), B. Aringer (IfAW), T. Beckert, M. Benisty (LAOG), X. Bonfils (FCUL), A. Chelli (LAOG, JMMC), O. Chesneau (LG), A. Chiavassa (GRAAL), R. Corradi (IAC), M. De Becker (IAGL), A. Delboulb\'e (LAOG), G. Duch\^ene (LAOG), T. Forveille (LAOG), C. Haniff (MRAO), E. Herwats (LAOG, Iagl), J.-B. Le Bouquin (ESO), S. Ligori (OATo), D. Loreggia (OAR), A. Marconi (OAA), A. Moitinho (FCUL), B. Nisini (OAR), P.-O. Petrucci (LAOG), J. Rebordao (INETI), R. Speziali (OAR), L. Testi (OAA, ESO), F. Vitali (OAR)
Milli-arcsecond astrophysics with VSI, the VLTI spectro-imager in the ELT era
8 pages. To be published in the proceedings of the ESO workshop "Science with the VLT in the ELT Era", held in Garching (Germany) on 8-12 October 2007, A. Moorwood editor
null
10.1007/978-1-4020-9190-2_57
null
astro-ph
null
Nowadays, compact sources like surfaces of nearby stars, circumstellar environments of stars from early stages to the most evolved ones and surroundings of active galactic nuclei can be investigated at milli-arcsecond scales only with the VLT in its interferometric mode. We propose a spectro-imager, named VSI (VLTI spectro-imager), which is capable to probe these sources both over spatial and spectral scales in the near-infrared domain. This instrument will provide information complementary to what is obtained at the same time with ALMA at different wavelengths and the extreme large telescopes.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 15:01:50 GMT" } ]
2009-11-13T00:00:00
[ [ "Malbet", "F.", "", "LAOG" ], [ "Buscher", "D.", "", "MRAO" ], [ "Weigelt", "G.", "", "CAUP" ], [ "Garcia", "P.", "", "CAUP" ], [ "Gai", "M.", "", "OATo" ], [ "Lorenzetti", "D.", "", "OAR" ], [ "Surdej", "J.", "", "IAGL" ], [ "Hron", "J.", "", "IfAW" ], [ "Neuhäuser", "R.", "", "AIU" ], [ "Kern", "P.", "", "LAOG" ], [ "Jocou", "L.", "", "LAOG" ], [ "Berger", "J. -P.", "", "LAOG" ], [ "Absil", "O.", "", "LAOG" ], [ "Beckmann", "U.", "", "OATo" ], [ "Corcione", "L.", "", "OATo" ], [ "Duvert", "G.", "", "LAOG, JMMC" ], [ "Filho", "M.", "", "CAUP" ], [ "Labeye", "P.", "", "LETI" ], [ "Coarer", "E. Le", "", "LAOG" ], [ "Causi", "G. Li", "", "OAR" ], [ "Lima", "J.", "", "FCUL" ], [ "Perraut", "K.", "", "LAOG" ], [ "Tatulli", "E.", "", "LAOG, JMMC, Oaa" ], [ "Thiébaut", "E.", "", "CRAL" ], [ "Young", "J.", "", "MRAO" ], [ "Zins", "G.", "", "LAOG" ], [ "Amorim", "A.", "", "FCUL" ], [ "Aringer", "B.", "", "IfAW" ], [ "Beckert", "T.", "", "LAOG" ], [ "Benisty", "M.", "", "LAOG" ], [ "Bonfils", "X.", "", "FCUL" ], [ "Chelli", "A.", "", "LAOG, JMMC" ], [ "Chesneau", "O.", "", "LG" ], [ "Chiavassa", "A.", "", "GRAAL" ], [ "Corradi", "R.", "", "IAC" ], [ "De Becker", "M.", "", "IAGL" ], [ "Delboulbé", "A.", "", "LAOG" ], [ "Duchêne", "G.", "", "LAOG" ], [ "Forveille", "T.", "", "LAOG" ], [ "Haniff", "C.", "", "MRAO" ], [ "Herwats", "E.", "", "LAOG, Iagl" ], [ "Bouquin", "J. -B. Le", "", "ESO" ], [ "Ligori", "S.", "", "OATo" ], [ "Loreggia", "D.", "", "OAR" ], [ "Marconi", "A.", "", "OAA" ], [ "Moitinho", "A.", "", "FCUL" ], [ "Nisini", "B.", "", "OAR" ], [ "Petrucci", "P. -O.", "", "LAOG" ], [ "Rebordao", "J.", "", "INETI" ], [ "Speziali", "R.", "", "OAR" ], [ "Testi", "L.", "", "OAA, ESO" ], [ "Vitali", "F.", "", "OAR" ] ]
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801.2695
Levente Molnar
D. Di Bari, A. Mastroserio, L. Molnar, E. Nappi, D. Perrino, G. Volpe
Contribution of the HMPID detector to the high-pT physics at LHC
6 pages, 7 figures, Contribution to QCD @ Work 2007: International Workshop on Quantum Chromodynamics Theory and Experiment, Martina Franca, Italy, 16-20 June 2007
AIPConf.Proc.964:218-223,2007
10.1063/1.2823853
null
nucl-ex
null
The LHC will deliver unexplored energy regimes for proton-proton and heavy-ion collisions. As shown by the RHIC experiments, particle identification over a large momentum range is essential to disentangle physics processes, especially in the intermediate p$_T$ (1 $<p_{T}<5$ GeV/c) region. The novel design of the High-Momentum Particle Identification Detector (HMPID), based on large surface CsI photocathodes, is able to identify $\pi^{\pm}$, $K^{\pm}$, $p$ and $\bar{p}$ in the momentum region where bulk medium properties and hard scatterings interplay. Furthermore, measurement of resonance particles such as the $\phi \to K^+K^-$ could provide information on the system evolution. The HMPID layout and segmentation are optimized to study particle correlations at high momenta describing the early phase and the dynamical evolution of the collision. At LHC, the increased hard cross section will significantly be enhanced compared to RHIC. Jet reconstruction via Deterministic Annealing can address jet quenching and detailed measurements of jet properties. In this paper, we present these selected topics from the possible HMPID contributions to the physics goals of LHC.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 15:15:43 GMT" } ]
2008-11-26T00:00:00
[ [ "Di Bari", "D.", "" ], [ "Mastroserio", "A.", "" ], [ "Molnar", "L.", "" ], [ "Nappi", "E.", "" ], [ "Perrino", "D.", "" ], [ "Volpe", "G.", "" ] ]
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801.2696
Mark V. Kartsovnik
D. Andres, M. V. Kartsovnik, W. Biberacher, K. Neumaier, I. Sheikin, and H. Mueller
Field-induced charge-density-wave transitions in the organic metal $\alpha$-(BEDT-TTF)$_2$KHg(SCN)$_4$ under hydrostatic pressure
18 pages, 13 figures
Low Temp. Phys. 37, 959 (2011)
null
null
cond-mat.str-el
null
Successive magnetic-field-induced charge-density-wave transitions in the molecular conductor $\alpha$-(BEDT-TTF)$_2$KHg(SCN)$_4$ are studied in the hydrostatic pressure regime, in which the zero field charge-density wave (CDW)state is completely suppressed. The orbital effect of the magnetic field is demonstrated to restore the density wave, while the orbital quantization induces different CDW states in different field intervals. In particular, we have found that at certain field orientations the hysteretic first order transitions between field-induced CDW subphases become visible at much higher temperatures. This observation is very well in line with the existing theories of field-induced CDW transitions.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 15:03:38 GMT" } ]
2018-01-09T00:00:00
[ [ "Andres", "D.", "" ], [ "Kartsovnik", "M. V.", "" ], [ "Biberacher", "W.", "" ], [ "Neumaier", "K.", "" ], [ "Sheikin", "I.", "" ], [ "Mueller", "H.", "" ] ]
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801.2697
Christian Fischer
Christian Kellermann and Christian S. Fischer
The running coupling from the four-gluon vertex in Landau gauge Yang-Mills theory
25 pages, 4 figures; v2: minor clarifications added and typos corrected, version accepted by PRD
Phys.Rev.D78:025015,2008
10.1103/PhysRevD.78.025015
null
hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider the running coupling from the four-gluon vertex in Landau gauge, SU($N_c$) Yang-Mills theory as given by a combination of dressing functions of the vertex and the gluon propagator. We determine these functions numerically from a coupled set of Dyson-Schwinger equations. We reproduce asymptotic freedom in the ultraviolet momentum region and find a coupling of order one at mid-momenta. In the infrared we find a nontrivial (i.e. nonzero) fixed point which is three orders of magnitude smaller than the corresponding fixed point in the coupling of the ghost-gluon vertex. This result explains why the Dyson-Schwinger and the functional renormalization group equations for the two point functions can agree in the infrared, although their structure is quite different. Our findings also support Zwanziger's notion of an infrared effective theory driven by the Faddeev-Popov determinant.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 15:17:48 GMT" }, { "version": "v2", "created": "Wed, 25 Jun 2008 15:08:48 GMT" } ]
2008-11-26T00:00:00
[ [ "Kellermann", "Christian", "" ], [ "Fischer", "Christian S.", "" ] ]
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801.2698
Dominique Sluse
D. Sluse (1), J.-F. Claeskens (2), D. Hutsem\'ekers (2) and J. Surdej (2) (1- Ecole Polytechnique F\'ed\'erale de Lausanne EPFL, Switzerland; 2- Liege University, Belgium)
Microlensing probes the AGN structure of the lensed quasar J1131-1231
3 pages, To appear in "The Nuclear Region, Host Galaxy and Environment of Active Galaxies" (RevMexAA - Conference Series)
null
null
null
astro-ph
null
We present the analysis of single epoch long slit spectra of the three brightest images of the gravitationally lensed system J1131-1231. These spectra provide one of the clearest observational evidence for differential micro-lensing of broad emission lines (BELs) in a gravitationally lensed quasar. The micro-lensing effect enables us: (1) to confirm that the width of the emission lines is anti-correlated to the size of the emitting region; (2) to show that the bulk of FeII is emitted in the outer parts of the Broad Line Region (BLR) while another fraction of FeII is produced in a compact region; (3) to derive interesting informations on the origin of the narrow intrinsic MgII absorption doublet observed in that system.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 15:10:53 GMT" } ]
2008-01-18T00:00:00
[ [ "Sluse", "D.", "" ], [ "Claeskens", "J. -F.", "" ], [ "Hutsemékers", "D.", "" ], [ "Surdej", "J.", "" ] ]
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801.2699
Erik Koop
E.J. Koop, B.J. van Wees, D. Reuter, A.D. Wieck, C.H. van der Wal
Spin Accumulation and Spin Relaxation in a Large Open Quantum Dot
4 pages, 4 figures
Phys. Rev. Lett 101, 056602 (2008)
10.1103/PhysRevLett.101.056602
null
cond-mat.mes-hall
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We report electronic control and measurement of an imbalance between spin-up and spin-down electrons in micron-scale open quantum dots. Spin injection and detection was achieved with quantum point contacts tuned to have spin-selective transport, with four contacts per dot for realizing a non-local spin-valve circuit. This provides an interesting system for studies of spintronic effects since the contacts to reservoirs can be controlled and characterized with high accuracy. We show how this can be used to extract in a single measurement the relaxation time for electron spins inside the dot ~ 300 ps and the degree of spin polarization of the contacts P ~ 0.8.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 16:05:32 GMT" }, { "version": "v2", "created": "Fri, 22 Aug 2008 17:24:13 GMT" } ]
2009-11-13T00:00:00
[ [ "Koop", "E. J.", "" ], [ "van Wees", "B. J.", "" ], [ "Reuter", "D.", "" ], [ "Wieck", "A. D.", "" ], [ "van der Wal", "C. H.", "" ] ]
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801.27
Amelia Sparavigna
Amelia Sparavigna
Labels discover physics: the development of new labelling methods as a promising research field for applied physics
16 pages, 9 fihures
null
null
null
physics.pop-ph physics.soc-ph
null
Labels and tags are accompanying us in almost each moment of our life and everywhere we are going, in the form of electronic keys or money, or simply as labels on products we are buying in shops and markets. The label diffusion, rapidly increasing for logistic reasons in the actual global market, carries huge amount of information but it is demanding security and anti-fraud systems. The first crucial point, for the consumer and producer safety, is to ensure the authenticity of the labelled products with systems against counterfeiting and piracy. Recent anti-fraud techniques are based on a sophisticated use of physical effects, from holograms till magnetic resonance or tunnel transitions between atomic sublevels. In this paper we will discuss labels and anti-fraud technologies as a new and very promising research field for applied physics.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 15:12:37 GMT" } ]
2008-01-18T00:00:00
[ [ "Sparavigna", "Amelia", "" ] ]
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801.2701
Yadin Y. Goldschmidt
Yadin Y. Goldschmidt and Jin-Tao Liu
Observing the Inverse melting of the vortex lattice in Bi$_2$Sr$_2$CaCu$_2$O$_8$ with point defects using Langevin simulations with vortex shaking
RevTex 4, 5 figures
null
null
null
cond-mat.supr-con cond-mat.dis-nn
null
Langevin dynamics simulations of the vortex matter in the highly-anisotropic high-temperature superconductor Bi$_2$Sr$_2$CaCu$_2$O$_8$ were performed. We introduced point defects as a smoothened distribution of a random potential. Both the electromagnetic and Josephson interactions among pancake vortices were included. A special shaking and annealing process was introduced to let the system approach the equilibrium configuration. We are able to see the inverse melting transition from the Bragg-glass to the amorphous vortex glass state, in agreement with recent experiments.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 15:13:22 GMT" } ]
2008-01-18T00:00:00
[ [ "Goldschmidt", "Yadin Y.", "" ], [ "Liu", "Jin-Tao", "" ] ]
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801.2702
Roberto Casalbuoni Prof
Roberto Casalbuoni (Department of Physics, University of Florence, INFN-Florence and Galileo Galilei Institute, Florence, Italy), Joaquim Gomis (PH-TH Division, CERN, Geneva, Switzerland, Departament d'Estructura i Constituents de la Mat\`eria and Institut de Ciencies del Cosmos, Universitat de Barcelona, Diagonal, Barcelona, Spain), Kiyoshi Kamimura (Department of Physics, Toho University, Funabashi, Japan) and Giorgio Longhi (Department of Physics, University of Florence, and INFN-Florence, Italy)
Space-time Vector Supersymmetry and Massive Spinning Particle
14 pages. Few references and two comments added
JHEP 0802:094,2008
10.1088/1126-6708/2008/02/094
null
hep-th
null
We construct the action of a relativistic spinning particle from a non-linear realization of a space-time odd vector extension of the Poincar\'e group. For particular values of the parameters appearing in the lagrangian the model has a gauge world-line supersymmetry.{As a consequence of this local symmetry there are BPS solutions in the model preserving 1/5 of the supersymmetries.} A supersymmetric invariant quantization produces two decoupled 4d Dirac equations.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 15:35:25 GMT" }, { "version": "v2", "created": "Tue, 29 Jan 2008 15:51:06 GMT" } ]
2014-11-18T00:00:00
[ [ "Casalbuoni", "Roberto", "", "Department of Physics, University of Florence,\n INFN-Florence and Galileo Galilei Institute, Florence, Italy" ], [ "Gomis", "Joaquim", "", "PH-TH Division, CERN, Geneva, Switzerland, Departament d'Estructura i\n Constituents de la Matèria and Institut de Ciencies del Cosmos, Universitat\n de Barcelona, Diagonal, Barcelona, Spain" ], [ "Kamimura", "Kiyoshi", "", "Department of\n Physics, Toho University, Funabashi, Japan" ], [ "Longhi", "Giorgio", "", "Department of\n Physics, University of Florence, and INFN-Florence, Italy" ] ]
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801.2703
Antonio Paulo Baeta Scarpelli
E. W. Dias, A. P. Baeta Scarpelli, L. C. T. Brito, Marcos Sampaio, M. C. Nemes
Implicit regularization beyond one loop order: gauge field theories
18 pages, 5 figures, accepted for publication in European Physical Journal
Eur.Phys.J.C55:667-681,2008
10.1140/epjc/s10052-008-0614-6
null
hep-th
null
We extend a constrained version of Implicit Regularization (CIR) beyond one loop order for gauge field theories. In this framework, the ultraviolet content of the model is displayed in terms of momentum loop integrals order by order in perturbation theory for any Feynman diagram, while the Ward-Slavnov-Taylor identities are controlled by finite surface terms. To illustrate, we apply CIR to massless abelian Gauge Field Theories (scalar and spinorial QED) to two loop order and calculate the two-loop beta-function of the spinorial QED.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 15:26:19 GMT" }, { "version": "v2", "created": "Thu, 17 Apr 2008 17:54:41 GMT" } ]
2008-11-26T00:00:00
[ [ "Dias", "E. W.", "" ], [ "Scarpelli", "A. P. Baeta", "" ], [ "Brito", "L. C. T.", "" ], [ "Sampaio", "Marcos", "" ], [ "Nemes", "M. C.", "" ] ]
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801.2704
Yuri Janssen
Y. Janssen, K. W. Dennis, R. Prozorov, P. C. Canfield, R. W. McCallum
Exotic (anti)ferromagnetism in single crystals of Pr6Ni2Si3
9 pages, 13 figures, submitted to PRB
null
10.1103/PhysRevB.77.214407
null
cond-mat.mtrl-sci
null
The ternary intermetallic compound Pr6Ni2Si3, is a member of a structure series of compounds based on a triangular structure where the number of Pr atoms in the prism cross section can be systematically varied. Pr6Ni2Si3 contains two distinct Pr lattice sites which result in complex interactions between the magnetic ions. Extensive measurements of specific heat and magnetization on single crystal samples indicate that Pr6Ni2Si3 orders with both a ferromagnet and an antiferromagnet component, with ordering temperatures of 39.6 K and ~ 32 K, respectively. The ferromagnetic component // c-axis is accompanied by a large hysteresis, and the antiferromagnetic component,_|_ c-axis is accompanied by a spin-flop-type transition. More detailed measurements, of the vector magnetization, indicate that the ferromagnetic and the antiferromagnetic order appear independent of each other. These results not only clarify the behavior of Pr6Ni2Si3 itself, but also of the other members of the structure series, Pr5Ni2Si3 and Pr15Ni7Si10.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 15:30:56 GMT" } ]
2009-11-13T00:00:00
[ [ "Janssen", "Y.", "" ], [ "Dennis", "K. W.", "" ], [ "Prozorov", "R.", "" ], [ "Canfield", "P. C.", "" ], [ "McCallum", "R. W.", "" ] ]
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801.2705
Paolo Pagano
P. Pagano, J.C. Raymond, F. Reale, S. Orlando
Modeling magnetohydrodynamics and non equilibrium SoHO/UVCS line emission of CME shocks
11 pages, 12 figures, 2 appendixes
null
10.1051/0004-6361:20079088
null
astro-ph
null
We provide a guideline to interpret the UVCS emission lines (in particular O VI and Si XII) during shock wave propagation in the outer solar corona. We use a numerical MHD model performing a set of simulations of shock waves generated in the corona and from the result we compute the plasma emission for the O VI and Si XII including the effects of NEI. We analyze the radiative and spectral properties of our model with the support of a detailed radiation model including Doppler dimming and an analytical model for shocks, and, finally, we synthesize the expected O VI 1032A line profile. We explain several spectral features of the observations like the absence of discontinuities in the O VI emission during the shock passage, the brightening of Si XII emission and the width of the lines. We use our model also to give very simple and general predictions for the strength of the line wings due to the ions shock heating and on the line shape for Limb CMEs or Halo CMEs. The emission coming from post-shock region in the solar corona roughly agrees with the emission from a simple planar and adiabatic shock, but the effect of thermal conduction and the magnetic field may be important depending on the event parameters. Doppler dimming significantly influences the O VI emission while Si XII line brightens mainly because of the shock compression. Significant shock heating is responsible for the wide and faint component of the O VI line usually observed which may be taken as a shock signature in the solar corona.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 15:31:27 GMT" } ]
2009-11-13T00:00:00
[ [ "Pagano", "P.", "" ], [ "Raymond", "J. C.", "" ], [ "Reale", "F.", "" ], [ "Orlando", "S.", "" ] ]
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801.2706
Alessandro Villar
Katiuscia N. Cassemiro and Alessandro S. Villar
Scalable continuous-variable entanglement of light beams produced by optical parametric oscillators
null
Phys. Rev. A 77, 022311 (2008)
10.1103/PhysRevA.77.022311
null
quant-ph
null
We show that scalable multipartite entanglement among light fields may be generated by optical parametric oscillators (OPO). The tripartite entanglement existent among the three bright beams produced by a single OPO -- pump, signal, and idler -- is scalable to a system of many OPOs by pumping them in cascade with the same optical field. This latter serves as an entanglement distributor. The special case of two OPOs is studied, as it is shown that the resulting five bright beams share genuine multipartite entanglement. In addition, the structure of entanglement distribution among the fields can be manipulated to some degree by tuning the incident pump power. The scalability to many fields is straightforward, allowing an alternative implementation of a multipartite quantum information network with continuous variables.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 15:34:26 GMT" }, { "version": "v2", "created": "Tue, 12 Feb 2008 09:34:55 GMT" } ]
2008-02-12T00:00:00
[ [ "Cassemiro", "Katiuscia N.", "" ], [ "Villar", "Alessandro S.", "" ] ]
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801.2707
Thomas Wiegelmann
T. Wiegelmann, J. K. Thalmann, C. J. Schrijver, M. L. Derosa, T. R. Metcalf
Can We Improve the Preprocessing of Photospheric Vector Magnetograms by the Inclusion of Chromospheric Observations?
22 pages, 6 Figure
Bibliographic Code: 2008SoPh..247..249W
10.1007/s11207-008-9130-y
null
astro-ph
null
The solar magnetic field is key to understanding the physical processes in the solar atmosphere. Nonlinear force-free codes have been shown to be useful in extrapolating the coronal field upward from underlying vector boundary data. However, we can only measure the magnetic field vector routinely with high accuracy in the photosphere, and unfortunately these data do not fulfill the force-free condition. We must therefore apply some transformations to these data before nonlinear force-free extrapolation codes can be self-consistently applied. To this end, we have developed a minimization procedure that yields a more chromosphere-like field, using the measured photospheric field vectors as input. The procedure includes force-free consistency integrals, spatial smoothing, and -- newly included in the version presented here -- an improved match to the field direction as inferred from fibrils as can be observed in, e.g., chromospheric H$\alpha$ images. We test the procedure using a model active-region field that included buoyancy forces at the photospheric level. The proposed preprocessing method allows us to approximate the chromospheric vector field to within a few degrees and the free energy in the coronal field to within one percent.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 19:57:31 GMT" }, { "version": "v2", "created": "Fri, 29 Feb 2008 12:28:34 GMT" } ]
2008-02-29T00:00:00
[ [ "Wiegelmann", "T.", "" ], [ "Thalmann", "J. K.", "" ], [ "Schrijver", "C. J.", "" ], [ "Derosa", "M. L.", "" ], [ "Metcalf", "T. R.", "" ] ]
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801.2708
Ioana Bena Dr.
Ioana Bena, Michel Droz, Janusz Szwabinski, Andrzej Pekalski
How bad is to be slow-reacting ? On the effect of the delay in response to a changing environment on a population's survival
7 pages, 4 figures
null
null
null
q-bio.PE cond-mat.stat-mech physics.bio-ph
null
We consider a simple-model population, whose individuals react with a certain delay to temporal variations of their habitat. We investigate the impact of such a delayed-answer on the survival chances of the population, both in a periodically changing environment, and in the case of an abrupt change of it. It is found that for population with low degree of mutation-induced variability, being "slow-reacting" decreases the extinction risk face to environmental changes. On the contrary, for populations with high mutation amplitude, the delayed reaction reduces the survival chances.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 15:50:41 GMT" } ]
2008-01-18T00:00:00
[ [ "Bena", "Ioana", "" ], [ "Droz", "Michel", "" ], [ "Szwabinski", "Janusz", "" ], [ "Pekalski", "Andrzej", "" ] ]
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801.2709
Yuri Yermolaev
Yu. I. Yermolaev
Comment on "Geoeffectiveness of halo coronal mass ejections" by N. Gopalswamy, S. Yashiro, and S. Akiyama
null
Cosmic Research, 2008, Vol. 46, No. 6, pp. 540-541.
10.1134/S0010952508060099
null
physics.space-ph physics.geo-ph
null
Comment on paper: Gopalswamy, N., S. Yashiro, and S. Akiyama (2007), Geoeffectiveness of halo coronal mass ejections, J. Geophys. Res., 112, A06112, doi:10.1029/2006JA012149 Gopalswamy et al. [2007] studied the geoeffectiveness of halo coronal mass ejections (CMEs) on the basis of solar observations during 1996-2005 and found that the geoeffectiveness of 229 frontside halo CMEs was 71%. Recently for observations of 305 frontside halo CMEs during 1997-2003 the geoeffectiveness was found to be 40% [Kim et al., 2005]. Complex analysis of both solar and interplanetary measurements showed that the geoeffectiveness of frontside halo CMEs is likely to be about 50% [Yermolaev et al., 2005; Yermolaev and Yermolaev, 2006]. Gopalswamy et al. [2007] did not discuss possible causes of this difference and were limited only to the general words: "The reason for the conflicting results (geoeffectiveness of CMEs ranging from 35% to more than 80%) may be attributed to the different definition of halo CMEs and geoeffectiveness." So, here we shall present our point of view on high geoeffectivenees of CME obtained in paper by Gopalswamy et al. [2007].
[ { "version": "v1", "created": "Thu, 17 Jan 2008 15:59:16 GMT" } ]
2009-04-01T00:00:00
[ [ "Yermolaev", "Yu. I.", "" ] ]
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801.271
Sushant Ghosh
S. G.Ghosh and D. W. Deshkar
Horizons of radiating black holes in Einstein gauss-bonnet gravity
4 pages, RevTeX, Accepted in Physical Review D
Phys.Rev.D77:047504,2008
10.1103/PhysRevD.77.047504
null
gr-qc
null
A Vaidya-based model of a radiating black-hole is studied in a 5-dimensional Einstein gravity with Gauss-Bonnet contribution of quadratic curvature terms. The structure and locations of the apparent and event horizons of the radiating black hole are determined.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 16:00:27 GMT" } ]
2008-11-26T00:00:00
[ [ "Ghosh", "S. G.", "" ], [ "Deshkar", "D. W.", "" ] ]
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801.2711
Hendrik Adorf
Hendrik Adorf and Michael Flohr
On Factorization Constraints for Branes in the H3+ Model
v2: version published in IJMPA; remark on possible pitfalls when doing the analytic continuations added; discussion of AdS2 vs. S2 branes changed; remarks on the brane spectrum and on the regular branes added; some typos corrected; Ref. Exton: Publisher added; 50 pages
Int.J.Mod.Phys.A23:3963-4010,2008
10.1142/S0217751X08041311
ITP-UH-02/08
hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We comment on the brane solutions for the boundary H3+ model that have been proposed so far and point out that they should be distinguished according to the patterns regular/irregular and discrete/continuous. In the literature, mostly irregular branes have been studied, while results on the regular ones are rare. For all types of branes, there are questions about how a second factorization constraint in the form of a b^{-2}/2-shift equation can be derived. Here, we assume analyticity of the boundary two point function, which means that the Cardy-Lewellen constraints remain unweakened. This enables us to derive unambiguously the desired b^{-2}/2-shift equations. They serve as important additional consistency conditions. For some regular branes, we also derive 1/2-shift equations that were not known previously. Case by case, we discuss possible solutions to the enlarged system of constraints. We find that the well-known irregular continuous AdS_2 branes are consistent with our new factorization constraint. Furthermore, we establish the existence of a new type of brane: The shift equations in a certain regular discrete case possess a non-trivial solution that we write down explicitly. All other types are found to be inconsistent when using our second constraint. We discuss these results in view of the Hosomichi-Ribault proposal and some of our earlier results on the derivation of b^{-2}/2-shift equations.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 16:10:52 GMT" }, { "version": "v2", "created": "Fri, 14 Nov 2008 15:50:44 GMT" } ]
2010-10-27T00:00:00
[ [ "Adorf", "Hendrik", "" ], [ "Flohr", "Michael", "" ] ]
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801.2712
Daniel Reitzner
Teiko Heinosaari, Peter Stano, Daniel Reitzner
Approximate Joint Measurability of Spin Along Two Directions
6 pages, 4 figures
International Journal of Quantum Information 6 (2008) 975-980
10.1142/S0219749908004365
null
quant-ph
null
We study the existence of jointly measurable POVM approximations to two non-commuting sharp spin observables. We compare two different ways to specify optimal approximations.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 16:01:01 GMT" } ]
2008-11-16T00:00:00
[ [ "Heinosaari", "Teiko", "" ], [ "Stano", "Peter", "" ], [ "Reitzner", "Daniel", "" ] ]
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801.2713
Giuliana Fiorentino
G. Fiorentino, R. Contreras, G. Clementini, K. Glatt, E. Sabbi, M. Sirianni, E. Grebel, and J. Ghallager
Detection of new variable stars in the SMC cluster NGC 121
3 pages, 3 figures
Mem.Soc.Ast.It.79:3,2008
null
null
astro-ph
null
New candidate variable stars have been identified in the Small Magellanic Cloud cluster NGC121, by applying both the image subtraction technique (ISIS, Alard 2000) and the Welch & Stetson (1993) detection method to HST WFPC2 archive and ACS proprietary images of the cluster. The new candidate variable stars are located from the cluster's Main Sequence up to Red Giant Branch. Twenty-seven of them fall on the cluster Horizontal Branch and are very likely RR Lyrae stars. They include the few RR Lyrae stars already discussed by Walker & Mack (1988). We also detected 20 Dwarf Cepheid candidates in the central region of NGC121. Our results confirm the "true" globular cluster nature of NGC121, a cluster that is at the young end of the Galactic globulars' age range.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 16:05:37 GMT" }, { "version": "v2", "created": "Fri, 18 Jan 2008 09:44:31 GMT" } ]
2009-06-23T00:00:00
[ [ "Fiorentino", "G.", "" ], [ "Contreras", "R.", "" ], [ "Clementini", "G.", "" ], [ "Glatt", "K.", "" ], [ "Sabbi", "E.", "" ], [ "Sirianni", "M.", "" ], [ "Grebel", "E.", "" ], [ "Ghallager", "J.", "" ] ]
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801.2714
Grigory Volovik
G.E. Volovik
On spectrum of vacuum energy
10 pages, 2 figures, JPCS style, prepared for proceedings of DICE-2008
Journal of Physics: Conference Series 174, 012007 (2009)
10.1088/1742-6596/174/1/012007
null
gr-qc cond-mat.stat-mech hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We discuss the problem of the spectral function of vacuum energy. In traditional approach the ultraviolet divergencies of the vacuum energy are cancelled by imposing relations between different quantum fields and their masses. The emergent theories suggest that the microscopic degrees of the underlying quantum vacuum add to the spectral function and their contribution cancels the diverging zero point energy of quantum fields. Examples of the spectral function of the vacuum energy in the condensed-matter systems with relativity emerging at low energy are presented. In the Sakharov induced gravity situation may be even more dramatic: only microscopic (Planck scale) constituent fields contribute to the vacuum energy, while the diverging zero-point energy of emergent quantum field (gravitational field) is missing. On the other hand consideration of the fermionic condensed matter systems suggests that emergent relativistic fermionic quasiparticles contribute in conventional way as Dirac vacuum.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 16:06:44 GMT" }, { "version": "v2", "created": "Sat, 19 Jan 2008 19:20:29 GMT" }, { "version": "v3", "created": "Wed, 14 Jan 2009 19:58:53 GMT" } ]
2015-05-13T00:00:00
[ [ "Volovik", "G. E.", "" ] ]
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801.2715
Levente Molnar
L. Molnar
Prospects for identified leading particle correlation at LHC and in ALICE
9 pages, 8 figures, Talk given at Workshop on High P(T) Physics at LHC (LHC07), Jyvaskyla, Finland, 23-27 Mar 2007
PoSLHC07:027,2007
null
null
nucl-ex
null
Azimuthal di-hadron correlations play important role in the characterization of the medium created in heavy-ion collisions at RHIC. Moreover, as a novel phenomenon, strong modification of the away-side correlation is observed in Au+Au with respect to p+p collisions. Below the exclusive jet reconstruction threshold at LHC, leading particle correlations will provide access to the regime where hard scatterings and bulk medium properties can be simultaneously studied. Leading particle correlations can be extended to very low transverse momenta via the tracking and particle identification capabilities of ALICE, to the coalescence and hydrodynamic domains. In preparation for the first p+p and Pb+Pb collisions of LHC, we present prospects on leading particle correlations with identified particles in ALICE.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 16:15:23 GMT" } ]
2008-11-26T00:00:00
[ [ "Molnar", "L.", "" ] ]
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801.2716
Gregory MacDougall
G. J. MacDougall, A. A. Aczel, J.P. Carlo, T. Ito, J. Rodriguez, P. L. Russo, Y. J. Uemura, S. Wakimoto, and G. M. Luke
Absence of time reversal symmetry breaking in La_{2-x}Sr_{x}CuO_{4}
Submitted to Phys. Rev. Lett. (2008)
Physical Review Letters 101, 017001 (2008).
10.1103/PhysRevLett.101.017001
null
cond-mat.supr-con
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We have performed zero-field muon spin rotation measurements on single crystals of La_{2-x}Sr_{x}CuO_{4} to search for spontaneous currents in the pseudo-gap state. By comparing measurements on materials across the phase diagram, we put strict upper limits on any possible time-reversal symmetry breaking fields that could be associated with the pseudo-gap. Comparison between experimental limits and proposed circulating current states effectively eliminates the possibility that such states exist in this family of materials.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 17:02:05 GMT" }, { "version": "v2", "created": "Fri, 6 Jun 2008 15:09:03 GMT" }, { "version": "v3", "created": "Tue, 1 Jul 2008 15:29:05 GMT" } ]
2009-11-13T00:00:00
[ [ "MacDougall", "G. J.", "" ], [ "Aczel", "A. A.", "" ], [ "Carlo", "J. P.", "" ], [ "Ito", "T.", "" ], [ "Rodriguez", "J.", "" ], [ "Russo", "P. L.", "" ], [ "Uemura", "Y. J.", "" ], [ "Wakimoto", "S.", "" ], [ "Luke", "G. M.", "" ] ]
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801.2717
Charalampos Moustakidis
Ch.C. Moustakidis
Temperature and momentum dependence of single-particle properties in hot asymmetric nuclear matter
22 pages, 14 figures
Phys.Rev.C78:054323,2008
10.1103/PhysRevC.78.054323
null
nucl-th nucl-ex
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We have studied the effects of momentum dependent interactions on the single-particle properties of hot asymmetric nuclear matter. In particular, the single-particle potential of protons and neutrons as well as the symmetry potential have been studied within a self-consistent model using a momentum dependent effective interaction. In addition, the isospin splitting of the effective mass has been derived from the above model. In each case temperature effects have been included and analyzed. The role of the specific parametrization of the effective interaction used in the present work has been investigated. It has been concluded that the behavior of the symmetry potential depends strongly on the parametrization of the interaction part of the energy density and the momentum dependence of the regulator function. The effects of the parametrization have been found to be less pronounced on the isospin mass splitting.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 16:25:56 GMT" }, { "version": "v2", "created": "Tue, 11 Nov 2008 06:34:28 GMT" } ]
2008-12-18T00:00:00
[ [ "Moustakidis", "Ch. C.", "" ] ]
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801.2718
F. de los Santos
Elvira Romera, Francisco de los Santos, Omar Al Hammal, and Miguel A. Munoz
Critical wetting of a class of nonequilibrium interfaces: A computer simulation study
7 pages, 8 figures
Physical Review E 77, 011116 (2008)
10.1103/PhysRevE.77.011116
null
cond-mat.stat-mech
null
Critical wetting transitions under nonequilibrium conditions are studied numerically and analytically by means of an interface-displacement model defined by a Kardar-Parisi-Zhang equation, plus some extra terms representing a limiting, short-ranged attractive wall. Its critical behavior is characterized in detail by providing a set of exponents for both the average height and the surface order-parameter in one dimension. The emerging picture is qualitatively and quantitatively different from recently reported mean-field predictions for the same problem. Evidence is shown that the presence of the attractive wall induces an anomalous scaling of the interface local slopes.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 16:41:07 GMT" } ]
2009-11-13T00:00:00
[ [ "Romera", "Elvira", "" ], [ "Santos", "Francisco de los", "" ], [ "Hammal", "Omar Al", "" ], [ "Munoz", "Miguel A.", "" ] ]
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801.2719
Paolo Butera
Lev N. Shchur (LITP), Bertrand Berche (LPM), and Paolo Butera (INFN)
High-precision determination of universal amplitude ratios for the q=3 Potts model in 2d
LaTeX, 20 pages with 6 figures
Phys. Rev. B 77 (2008) 144410
10.1103/PhysRevB.77.144410
null
cond-mat.stat-mech hep-lat
null
Monte Carlo simulations and series expansion data for the energy, specific heat, magnetization and susceptibility of the 3-state Potts model on the square lattice are analyzed in the vicinity of the critical point in order to estimate universal combinations of critical amplitudes.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 17:16:04 GMT" } ]
2008-06-30T00:00:00
[ [ "Shchur", "Lev N.", "", "LITP" ], [ "Berche", "Bertrand", "", "LPM" ], [ "Butera", "Paolo", "", "INFN" ] ]
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801.272
David Craven
David A. Craven
Algebraic Modules and the Auslander--Reiten Quiver
10 pages
null
null
null
math.RT
null
Recall that an algebraic module is a KG-module that satisfies a polynomial with integer coefficients, with addition and multiplication given by direct sum and tensor product. In this article we prove that non-periodic algebraic modules are very rare, and that if the complexity of an algebraic module is at least 3, then it is the only algebraic module on its component of the (stable) Auslander--Reiten quiver. We include a strong conjecture on the relationship between periodicity and algebraicity.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 16:52:10 GMT" } ]
2008-01-18T00:00:00
[ [ "Craven", "David A.", "" ] ]
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801.2721
Alain Le-Yaouanc
Ph. Boucaud, J-P. Leroy, A. Le Yaouanc, J. Micheli, O. Pene, J. Rodriguez--Quintero
IR finiteness of the ghost dressing function from numerical resolution of the ghost SD equation
17 pages, 3 figures (one new figure and a short paragraph added)
JHEP 0806:012,2008
10.1088/1126-6708/2008/06/012
LPT-Orsay/08-44, UHU-FT/0803
hep-ph hep-lat
null
We solve numerically the Schwinger-Dyson (SD hereafter) ghost equation in the Landau gauge for a given gluon propagator finite at k=0 (alpha_gluon=1) and with the usual assumption of constancy of the ghost-gluon vertex ; we show that there exist two possible types of ghost dressing function solutions, as we have previously inferred from analytical considerations : one singular at zero momentum, satisfying the familiar relation alpha_gluon+2 alpha_ghost=0 between the infrared exponents of the gluon and ghost dressing functions(in short, respectively alpha_G and alpha_F) and having therefore alpha_ghost=-1/2, and another which is finite at the origin (alpha_ghost=0), which violates the relation. It is most important that the type of solution which is realized depends on the value of the coupling constant. There are regular ones for any coupling below some value, while there is only one singular solution, obtained only at a critical value of the coupling. For all momenta k<1.5 GeV where they can be trusted, our lattice data exclude neatly the singular one, and agree very well with the regular solution we obtain at a coupling constant compatible with the bare lattice value.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 16:53:30 GMT" }, { "version": "v2", "created": "Mon, 17 Mar 2008 16:29:15 GMT" } ]
2010-03-19T00:00:00
[ [ "Boucaud", "Ph.", "" ], [ "Leroy", "J-P.", "" ], [ "Yaouanc", "A. Le", "" ], [ "Micheli", "J.", "" ], [ "Pene", "O.", "" ], [ "Rodriguez--Quintero", "J.", "" ] ]
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801.2722
Manuela Capello
Manuela Capello, Marcin Raczkowski, and Didier Poilblanc
Stability of RVB hole stripes in high-temperature superconductors
8 pages, 9 figures. Enlarged version
Phys. Rev. B 77, 224502 (2008)
10.1103/PhysRevB.77.224502
null
cond-mat.str-el
null
Indications of density-wave states in underdoped cuprates, coming from recent STM (scanning tunneling microscopy) and Hall-resistance measurements, have raised new concerns whether stripes could be stabilized in the superconducting phase of cuprate materials, even in the absence of antiferromagnetism. Here, we investigate this issue using state-of-the-art quantum Monte Carlo calculations of a $t-J$ model. In particular we consider the stability of unidirectional hole domains in a modulated superconducting background, by taking into account the effect of tetragonal-lattice distortions, next-nearest neighbor hopping and long-range Coulomb repulsion.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 17:05:48 GMT" }, { "version": "v2", "created": "Thu, 15 May 2008 16:19:27 GMT" } ]
2009-11-13T00:00:00
[ [ "Capello", "Manuela", "" ], [ "Raczkowski", "Marcin", "" ], [ "Poilblanc", "Didier", "" ] ]
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801.2723
David Craven
David A. Craven
On the Tensor Products of Modules for Dihedral 2-Groups
11 pages
null
null
null
math.RT
null
Recall that an algebraic module is a KG-module that satisfies a polynomial with integer coefficients, with addition and multiplication given by direct sum and tensor product. In this article we prove that if L is a component of the (stable) Auslander-Reiten quiver for a dihedral 2-group consisting of non-periodic modules, then there is at most one algebraic module on L.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 17:19:15 GMT" } ]
2008-01-18T00:00:00
[ [ "Craven", "David A.", "" ] ]
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801.2724
Juerg Froehlich
Juerg Froehlich
Spin - or, actually: Spin and Quantum Statistics
50 pages, no figures, seminar on "spin"
null
10.1007/978-3-7643-8799-0_1
null
math-ph math.MP
null
The history of the discovery of electron spin and the Pauli principle and the mathematics of spin and quantum statistics are reviewed. Pauli's theory of the spinning electron and some of its many applications in mathematics and physics are considered in more detail. The role of the fact that the tree-level gyromagnetic factor of the electron has the value g = 2 in an analysis of stability (and instability) of matter in arbitrary external magnetic fields is highlighted. Radiative corrections and precision measurements of g are reviewed. The general connection between spin and statistics, the CPT theorem and the theory of braid statistics are described.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 17:15:39 GMT" }, { "version": "v2", "created": "Mon, 21 Jan 2008 11:25:31 GMT" }, { "version": "v3", "created": "Fri, 29 Feb 2008 16:46:49 GMT" } ]
2015-05-13T00:00:00
[ [ "Froehlich", "Juerg", "" ] ]
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801.2725
Eric D. Chisolm
Thomas F. Jordan and Eric D. Chisolm
Probability sum rules and consistent quantum histories
14 pages, 2 figures, added discussion of tensor-product histories in response to Physics Letters A referee, corrected typo
Physics Letters A 373, 3016 (2009)
10.1016/j.physleta.2009.06.064
LA-UR 09-03687
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
An example shows that weak decoherence is more restrictive than the minimal logical decoherence structure that allows probabilities to be used consistently for quantum histories. The probabilities in the sum rules that define minimal decoherence are all calculated by using a projection operator to describe each possibility for the state at each time. Weak decoherence requires more sum rules. They bring in additional variables, that require different measurements and a different way to calculate probabilities, and raise questions of operational meaning. The example shows that extending the linearly positive probability formula from weak to minimal decoherence gives probabilities that are different from those calculated in the usual way using the Born and von Neumann rules and a projection operator at each time.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 17:21:53 GMT" }, { "version": "v2", "created": "Thu, 13 Mar 2008 15:01:07 GMT" }, { "version": "v3", "created": "Wed, 11 Jun 2008 21:32:05 GMT" }, { "version": "v4", "created": "Thu, 12 Jun 2008 20:24:11 GMT" }, { "version": "v5", "created": "Thu, 11 Jun 2009 22:37:58 GMT" }, { "version": "v6", "created": "Mon, 6 Jul 2009 22:58:22 GMT" }, { "version": "v7", "created": "Tue, 21 Jul 2009 21:06:26 GMT" } ]
2010-10-11T00:00:00
[ [ "Jordan", "Thomas F.", "" ], [ "Chisolm", "Eric D.", "" ] ]
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801.2726
Mohammad Sal Moslehian
O. Hirzallah, F. Kittaneh, M. S. Moslehian
Schatten p-norm inequalities related to a characterization of inner product spaces
Minor revision, to appear in Math. Inequal. Appl. (MIA)
Math. Inequal. Appl. 13 (2010), no. 2, 235-241
10.7153/mia-13-19
null
math.FA math.OA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Let $A_1, ... A_n$ be operators acting on a separable complex Hilbert space such that $\sum_{i=1}^n A_i=0$. It is shown that if $A_1, ... A_n$ belong to a Schatten $p$-class, for some $p>0$, then 2^{p/2}n^{p-1} \sum_{i=1}^n \|A_i\|^p_p \leq \sum_{i,j=1}^n\|A_i\pm A_j\|^p_p for $0<p\leq 2$, and the reverse inequality holds for $2\leq p<\infty$. Moreover, \sum_{i,j=1}^n\|A_i\pm A_j\|^2_p \leq 2n^{2/p} \sum_{i=1}^n \|A_i\|^2_p for $0<p\leq 2$, and the reverse inequality holds for $2\leq p<\infty$. These inequalities are related to a characterization of inner product spaces due to E.R. Lorch.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 19:50:05 GMT" }, { "version": "v2", "created": "Thu, 4 Dec 2008 09:48:02 GMT" } ]
2021-07-23T00:00:00
[ [ "Hirzallah", "O.", "" ], [ "Kittaneh", "F.", "" ], [ "Moslehian", "M. S.", "" ] ]
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801.2727
Andrieux David
D. Andrieux and P. Gaspard
Dynamical randomness, information, and Landauer's principle
null
Europhys. Lett. 81, 28004 (2008)
10.1209/0295-5075/81/28004
null
cond-mat.stat-mech
null
New concepts from nonequilibrium thermodynamics are used to show that Landauer's principle can be understood in terms of time asymmetry in the dynamical randomness generated by the physical process of the erasure of digital information. In this way, Landauer's principle is generalized, showing that the dissipation associated with the erasure of a sequence of bits produces entropy at the rate $k_{{\rm B}}I$ per erased bit, where $I$ is Shannon's information per bit.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 17:23:48 GMT" } ]
2009-11-13T00:00:00
[ [ "Andrieux", "D.", "" ], [ "Gaspard", "P.", "" ] ]
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801.2728
Paolo Visco
P. Visco, F. van Wijland, E. Trizac
Non Poissonian statistics in a low density fluid
4 pages, 2 figures
J. Phys. Chem. B 112 (17), 5412 (2008)
10.1021/jp800333h
null
cond-mat.stat-mech cond-mat.soft
null
Our interest goes to the collisional statistics in an arbitrary interacting fluid. We show that even in the low density limit and contrary to naive expectation, the number of collisions experienced by a tagged particle in a given time does not obey Poisson law, and that conversely, the free flight time distribution is not a simple exponential. As an illustration, the hard sphere fluid case is worked out in detail. For this model, we quantify analytically those deviations and successfully compare our predictions against molecular dynamics simulations.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 17:40:06 GMT" } ]
2008-04-30T00:00:00
[ [ "Visco", "P.", "" ], [ "van Wijland", "F.", "" ], [ "Trizac", "E.", "" ] ]
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801.2729
Luca Martinazzi
Luca Martinazzi
Classification of solutions to the higher order Liouville's equation on R^{2m}
null
Math. Z. 263 (2009), 307-329
10.1007/s00209-008-0419-1
null
math.AP math.DG
null
We classify the solutions to the equation (- \Delta)^m u=(2m-1)!e^{2mu} on R^{2m} giving rise to a metric g=e^{2u}g_{R^{2m}} with finite total $Q$-curvature in terms of analytic and geometric properties. The analytic conditions involve the growth rate of u and the asymptotic behaviour of \Delta u(x) as |x|\to \infty. As a consequence we give a geometric characterization in terms of the scalar curvature of the metric e^{2u}g_{R^{2m}} at infinity, and we observe that the pull-back of this metric to $S^{2m}$ via the stereographic projection can be extended to a smooth Riemannian metric if and only if it is round.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 17:35:53 GMT" } ]
2015-07-29T00:00:00
[ [ "Martinazzi", "Luca", "" ] ]
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801.273
Mario Nicodemi
M. Nicodemi and A. Prisco
A Symmetry Breaking Model for X Chromosome Inactivation
See also Nature Physics N&V April 2007
Phys. Rev. Lett. 98, 108104 (2007)
10.1103/PhysRevLett.98.108104
null
q-bio.SC
null
In mammals, dosage compensation of X linked genes in female cells is achieved by inactivation of one of their two X chromosomes which is randomly chosen. The earliest steps in X-inactivation (XCI), namely the mechanism whereby cells count their X chromosomes and choose between two equivalent X, remain mysterious. Starting from the recent discovery of X chromosome colocalization at the onset of X-inactivation, we propose a Statistical Mechanics model of XCI, which is investigated by computer simulations and checked against experimental data. Our model describes how a `blocking factor' complex is self-assembled and why only one is formed out of many diffusible molecules, resulting in a spontaneous symmetry breaking (SB) in the binding to two identical chromosomes. These results are used to derive a scenario of biological implications describing all current experimental evidences, e.g., the importance of colocalization.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 17:36:31 GMT" } ]
2009-11-13T00:00:00
[ [ "Nicodemi", "M.", "" ], [ "Prisco", "A.", "" ] ]
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801.2731
Jose Luis Toca-Herrera
Miguel J.A. Lainez, Luis-Millan Gonzalez, Jose E. Gallach, Gerard Moras, Daniel Ranz, and Jose L. Toca-Herrera
Strength stimuli on the quadriceps femoris influences the physiological tremor of the index finger
22 pages, 5 figures, 1 table
null
null
null
physics.med-ph
null
The influence of fatiguing stimuli applied to the quadriceps femoris on the tremor of the index finger on sixteen healthy subjects has been investigated, by measuring the acceleration and the electromyography activity of the extensor digitorum at two different speeds. No significant changes in the basal condition could be measured at 0.52 rad/s. However, at 1.05 rad/s the tremor amplitude (12.23%, p<0.05) and the electromyography activity (20.19%, p<0.05) increased in the time domain. In the frequential domain, the peak associated to the acceleration increased in 26.30% (p<0.05), while the electromiography activity experienced an increase of 81.34% (p<0.05). The largest change in frequency took place in the range 7-17 Hz. The discussion of the results leads to the conclusion that the supraespinal mechanism is responsible for the measured effect.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 17:46:51 GMT" } ]
2008-01-18T00:00:00
[ [ "Lainez", "Miguel J. A.", "" ], [ "Gonzalez", "Luis-Millan", "" ], [ "Gallach", "Jose E.", "" ], [ "Moras", "Gerard", "" ], [ "Ranz", "Daniel", "" ], [ "Toca-Herrera", "Jose L.", "" ] ]
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801.2732
Blanca Biel
Blanca Biel, F.J. Garcia-Vidal, Angel Rubio and Fernando Flores
Ab initio study of transport properties in defected carbon nanotubes: an O(N) approach
15 pages, 12 figures (submitted to J. Phys: Condens. Matter)
J. Phys.: Condens. Matter 20, 294214 (2008)
10.1088/0953-8984/20/29/294214
null
cond-mat.mes-hall cond-mat.mtrl-sci
null
A combination of ab initio simulations and linear-scaling Green's functions techniques is used to analyze the transport properties of long (up to one micron) carbon nanotubes with realistic disorder. The energetics and the influence of single defects (mono- and di-vacancies) on the electronic and transport properties of single-walled armchair carbon nanotubes are analyzed as a function of the tube diameter by means of the local orbital first-principles Fireball code. Efficient O(N) Green's functions techniques framed within the Landauer-Buttiker formalism allow a statistical study of the nanotube conductance averaged over a large sample of defected tubes and thus extraction of the nanotubes localization length. Both the cases of zero and room temperature are addressed.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 17:40:43 GMT" } ]
2009-03-03T00:00:00
[ [ "Biel", "Blanca", "" ], [ "Garcia-Vidal", "F. J.", "" ], [ "Rubio", "Angel", "" ], [ "Flores", "Fernando", "" ] ]
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801.2733
Nicola Fabiano
Nicola Fabiano
On the cross-section peaks for a heavy quark bound state
8 pages, latex2e. Accepted for publication in EPJC. Revised version has an added paragraph about J/psi
Eur.Phys.J.C58:395-398,2008
10.1140/epjc/s10052-008-0789-x
null
hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We discuss the values of resonance peaks of the cross-section of a heavy quark bound state obtained by means of a Green function method applied to a Coulombic model and compare the result to the Upsilon and J/psi data.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 17:46:13 GMT" }, { "version": "v2", "created": "Fri, 24 Oct 2008 20:01:14 GMT" } ]
2008-12-18T00:00:00
[ [ "Fabiano", "Nicola", "" ] ]
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801.2734
Fabio Franchini
Fabio Franchini
On Hydrodynamic Correlations in Low-Dimensional Interacting Systems
Ph.D. Graduation Thesis, University of Stony Brook, New York (U.S.A) 211 Pages, 21 Figures, 1 Table
null
null
null
cond-mat.str-el cond-mat.other
null
Low-dimensional systems are an important field of current theoretical and experimental research. Recent technological developments provide many possible realizations of effectively one-dimensional systems. These devices promise to give us access to a new range of phenomena. It is therefore very interesting to develop theoretical methods specific for such systems to model their behavior and calculate the correlators of the resulting theory. Incidentally, one such method exists and is known as Bosonization. It can be applied to one-dimensional systems and effectively describes low energy excitations in a universal way. We use the example of a correlator known as the Emptiness Formation Probability to show that Bosonization fails to describe some long range correlators corresponding to large disturbances (the EFP measures the probability for the ground state of the system to develop a region without particles). We trace this failure to the fact that Bosonization is constructed as a linear approximation of the full theory and we set up to develop a collective description with the required non-linearity. The resulting scheme is essentially a Hydrodynamic paradigm for quantum systems. We show how to construct such a hydrodynamic description for a variety of exactly integrable models and illustrate how it can be used to make new predictions. For the special case of the spin-1/2 XY model we take advantage of the structure of the model to express the EFP as a determinant of a very special type of matrix, known as Toeplitz Matrix. We use the theory of Toeplitz determinants to calculate the asymptotic behavior of the EFP in the XY model and discuss its relation with the criticality of the theory.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 17:54:57 GMT" } ]
2008-01-18T00:00:00
[ [ "Franchini", "Fabio", "" ] ]
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801.2735
Rajiv Singh
Rajiv R. P. Singh and David A. Huse
Triplet and Singlet Excitations in the Valence Bond Crystal Phase of Kagome Lattice Heisenberg Model
8 pages, 2 figures
Phys. Rev. B 77, 144415 (2008)
10.1103/PhysRevB.77.144415
null
cond-mat.str-el
null
A proposed ground state for the Kagome Lattice Heisenberg Model (KLHM) consists of a Valence Bond Crystal (VBC) with a 36-site unit cell. We calculate the low-lying triplet and singlet excitations in the VBC phase for the infinite-lattice model and for the 36-site cluster. For the infinite lattice, the lowest triplet excitation is found to have a spin gap of approximately $0.08 \pm 0.02 J$ and a bandwidth of only about $0.01 J$. For the 36-site cluster, consisting of a single unit cell with periodic boundary conditions, there are substantial finite-size effects: the spin gap there is estimated to be approximately $0.2 J$, close to the exact diagonalization result of $0.164 J$. The triplet excitations attract one another and form many bound states in the spin-singlet channel. We find a large number of such bound states for the 36-site cluster, many of which appear to lie below the spin gap, again in agreement with the results from exact diagonalization.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 18:02:21 GMT" } ]
2009-11-13T00:00:00
[ [ "Singh", "Rajiv R. P.", "" ], [ "Huse", "David A.", "" ] ]
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801.2736
Neil Drummond
A. Ma, N. D. Drummond, M. D. Towler, and R. J. Needs
All-electron quantum Monte Carlo calculations for the noble gas atoms He to Xe
null
A. Ma et al., Phys. Rev. E 71, 066704 (2005)
10.1103/PhysRevE.71.066704
null
cond-mat.mtrl-sci
null
We report all-electron variational and diffusion quantum Monte Carlo (VMC and DMC) calculations for the noble gas atoms He, Ne, Ar, Kr, and Xe. The calculations were performed using Slater-Jastrow wave functions with Hartree-Fock single-particle orbitals. The quality of both the optimized Jastrow factors and the nodal surfaces of the wave functions declines with increasing atomic number Z, but the DMC calculations are tractable and well behaved in all cases. We discuss the scaling of the computational cost of DMC calculations with Z.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 18:05:20 GMT" } ]
2008-01-18T00:00:00
[ [ "Ma", "A.", "" ], [ "Drummond", "N. D.", "" ], [ "Towler", "M. D.", "" ], [ "Needs", "R. J.", "" ] ]
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801.2737
Sergio Colafrancesco
S. Colafrancesco, P. Marchegiani
Warming rays in cluster cool cores
19 pages, 17 figures, A&A in press
null
10.1051/0004-6361:20078428
null
astro-ph
null
We present a model of cosmic ray heating of clusters' cores that reproduces the observed temperature distribution in clusters by using an energy balance condition in which the emitted X-ray energy is supplied by the hadronic cosmic rays, which act as warming rays (WRs). The temperature profile of the IC gas is correlated with the WR pressure distribution and, consequently, with the non-thermal emission (radio, hard X-ray and gamma-ray) induced by the interaction of the WRs with the IC gas and magnetic field. The temperature distribution of the IC gas in both cool-core and non cool-core clusters is successfully predicted from the measured IC gas density distribution. Under this contraint, the WR model is also able to reproduce the thermal and non-thermal pressure distribution in clusters, as well as their radial entropy distribution. The WR model provides other observable features: a correlation of the pressure ratio (WRs to thermal IC gas) with the inner cluster temperature T_{inner}, a correlation of the gamma-ray luminosity with T_{inner}, a substantial number of cool-core clusters observable with the GLAST-LAT experiment, a surface brightness of radio halos in cool-core clusters that recovers the observed one, a hard X-ray emission from cool-core clusters that is systematically lower than the observed limits and yet observable with the next generation HXR experiments like Simbol-X. The specific theoretical properties and the multi-frequency distribution of the e.m. signals predicted in the WR model render it quite different from the other models proposed for the heating of clusters' cool-cores. Such differences make it possible to prove or disprove our model as an explanation of the cooling-flow problems on the basis of multi-frequency observations of galaxy clusters.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 18:05:33 GMT" } ]
2009-11-13T00:00:00
[ [ "Colafrancesco", "S.", "" ], [ "Marchegiani", "P.", "" ] ]
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801.2738
Francesco Leone
M. J. Stift, F. Leone
Paschen is Partially Back
6 pages, 3 figures
Contrib.Astron.Obs.Skalnate Pleso 38:185-190,2008
null
null
astro-ph
null
We present a discussion of the partial Paschen-Back (PB) effect in magnetic Ap stars. An overview of the theory is illustrated with examples of how splittings deviate non-linearly from the simple Zeeman picture; normally forbidden ``ghost lines'' appear in strong fields. Resulting asymmetric stellar Stokes profiles for a dipolar magnetic geometry are shown for the FeII 6149 line and it is established that PB lines may be subject to wavelength shifts. Modelling of Stokes profiles in the PB regime opens exciting new diagnostics.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 18:08:32 GMT" } ]
2010-11-26T00:00:00
[ [ "Stift", "M. J.", "" ], [ "Leone", "F.", "" ] ]
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801.2739
David Berenstein
David Berenstein, Randel Cotta, Rodrigo Leonardi
Numerical tests of AdS/CFT at strong coupling
23 pages, 7 figures, revtex. v2: minor corrections
Phys.Rev.D78:025008,2008
10.1103/PhysRevD.78.025008
NI07082
hep-th
null
We study various correlation functions (two and three point functions) in a large $N$ matrix model of six commuting matrices with a numerical Monte Carlo algorithm. This is equivalent to a model of a gas of particles in six dimensions with a confining quadratic potential and logarithmic repulsions at finite temperature, where we are measuring the leading order non-gaussianities in the thermal fluctuations. This is a simplified model of the low energy dynamics of N=4 SYM at strong coupling. We find strong evidence that the simplified matrix model matches with the dual gravitational description of three point functions in the AdS/CFT correspondence.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 18:09:20 GMT" }, { "version": "v2", "created": "Wed, 2 Apr 2008 18:46:18 GMT" } ]
2008-12-18T00:00:00
[ [ "Berenstein", "David", "" ], [ "Cotta", "Randel", "" ], [ "Leonardi", "Rodrigo", "" ] ]
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801.274
Francesco Leone
M.J. Stift, F. Leone and E. Landi Degl'Innocenti
Modelling the incomplete Paschen-Back effect in the spectra of magnetic Ap stars
8 pages, 10 figures, to appear in MNRAS
null
10.1111/j.1365-2966.2008.12981.x
null
astro-ph
null
We present first results of a systematic investigation of the incomplete Paschen-Back effect in magnetic Ap stars. A short overview of the theory is followed by a demonstration of how level splittings and component strengths change with magnetic field strength for some lines of special astrophysical interest. Requirements are set out for a code which allows the calculation of full Stokes spectra in the Paschen-Back regime and the behaviour of Stokes I and V profiles of transitions in the multiplet 74 of FeII is discussed in some detail. It is shown that the incomplete Paschen-Back effect can lead to noticeable line shifts which strongly depend on total multiplet strength, magnetic field strength and field direction. Ghost components (which violate the normal selection rule on J) show up in strong magnetic fields but are probably unobservable. Finally it is shown that measurements of the integrated magnetic field modulus $H_s$ are not adversely affected by the Paschen-Back effect, and that there is a potential problem in (magnetic) Doppler mapping if lines in the Paschen-Back regime are treated in the Zeeman approximation.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 18:15:22 GMT" } ]
2009-11-13T00:00:00
[ [ "Stift", "M. J.", "" ], [ "Leone", "F.", "" ], [ "Degl'Innocenti", "E. Landi", "" ] ]
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801.2741
Walter Simon
Walter Simon
Static perfect fluids with Pant-Sah equations of state
32 p., Latex, minor changes and corrections
Gen.Rel.Grav.40:2591-2618,2008
10.1007/s10714-008-0641-5
null
gr-qc
null
We analyze the 3-parameter family of exact, regular, static, spherically symmetric perfect fluid solutions of Einstein's equations (corresponding to a 2-parameter family of equations of state) due to Pant and Sah and "rediscovered" by Rosquist and the present author. Except for the Buchdahl solutions which are contained as a limiting case, the fluids have finite radius and are physically realistic for suitable parameter ranges. The equations of state can be characterized geometrically by the property that the 3-metric on the static slices, rescaled conformally with the fourth power of any linear function of the norm of the static Killing vector, has constant scalar curvature. This local property does not require spherical symmetry; in fact it simplifies the the proof of spherical symmetry of asymptotically flat solutions which we recall here for the Pant-Sah equations of state. We also consider a model in Newtonian theory with analogous geometric and physical properties, together with a proof of spherical symmetry of the asymptotically flat solutions.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 18:18:36 GMT" }, { "version": "v2", "created": "Mon, 31 Mar 2008 18:00:40 GMT" } ]
2008-12-18T00:00:00
[ [ "Simon", "Walter", "" ] ]
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801.2742
Neil Drummond
A. Ma, M. D. Towler, N. D. Drummond, and R. J. Needs
Scheme for adding electron-nucleus cusps to Gaussian orbitals
null
A. Ma et al., J. Chem. Phys. 122, 224322 (2005)
10.1063/1.1940588
null
physics.comp-ph
null
A simple scheme is described for introducing the correct cusps at nuclei into orbitals obtained from Gaussian basis set electronic structure calculations. The scheme is tested with all-electron variational quantum Monte Carlo (VMC) and diffusion quantum Monte Carlo (DMC) methods for the Ne atom, the H2 molecule, and 55 molecules from a standard benchmark set. It greatly reduces the variance of the local energy in all cases and slightly improves the variational energy. This scheme yields a general improvement in the efficiency of all-electron VMC and DMC calculations using Gaussian basis sets.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 18:18:55 GMT" } ]
2008-01-18T00:00:00
[ [ "Ma", "A.", "" ], [ "Towler", "M. D.", "" ], [ "Drummond", "N. D.", "" ], [ "Needs", "R. J.", "" ] ]
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801.2743
Arnoldas Deltuva
A. Deltuva, A.C. Fonseca, P.U. Sauer
Four-nucleon system with $\Delta$-isobar excitation
11 figures, to be published in Phys. Lett. B
Phys.Lett.B660:471-477,2008
10.1016/j.physletb.2007.12.058
null
nucl-th
null
The four-nucleon bound state and scattering below three-body breakup threshold are described based on the realistic coupled-channel potential CD Bonn + $\Delta$ which allows the excitation of a single nucleon to a $\Delta$ isobar. The Coulomb repulsion between protons is included. In the four-nucleon system the two-baryon coupled-channel potential yields effective two-, three- and four-nucleon forces, mediated by the $\Delta$ isobar and consistent with each other and with the underlying two-nucleon force. The effect of the four-nucleon force on the studied observables is much smaller than the effect of the three-nucleon force. The inclusion of the $\Delta$ isobar is unable to resolve the existing discrepancies with the experimental data.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 18:21:12 GMT" } ]
2008-11-26T00:00:00
[ [ "Deltuva", "A.", "" ], [ "Fonseca", "A. C.", "" ], [ "Sauer", "P. U.", "" ] ]
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801.2744
Claire Berger
Jakub Kedzierski, Pei-Lan Hsu, Paul Healey, Peter Wyatt, Craig Keast, Mike Sprinkle, Claire Berger, Walt de Heer
Epitaxial graphene transistors on SiC substrates
null
IEEE /Transactions on Electron Devices 55, 2078 (2008).
10.1109/TED.2008.926593
null
cond-mat.mtrl-sci
null
This paper describes the behavior of top gated transistors fabricated using carbon, particularly epitaxial graphene on SiC, as the active material. In the past decade research has identified carbon-based electronics as a possible alternative to silicon-based electronics. This enthusiasm was spurred by high carbon nanotube carrier mobilities. However, nanotube production, placement, and control are all serious issues. Graphene, a thin sheet of graphitic carbon, can overcome some of these problems and therefore is a promising new electronic material. Although graphene devices have been built before, in this work we provide the first demonstration and systematic evaluation of arrays of a large number of transistors entirely produced using standard microelectronics methods. Graphene devices presented feature high-k dielectric, mobilities up to 5000 cm2/Vs and, Ion/Ioff ratios of up to 7, and are methodically analyzed to provide insight into the substrate properties. Typical of graphene, these micron-scale devices have negligible band gaps and therefore large leakage currents.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 18:26:58 GMT" } ]
2009-11-13T00:00:00
[ [ "Kedzierski", "Jakub", "" ], [ "Hsu", "Pei-Lan", "" ], [ "Healey", "Paul", "" ], [ "Wyatt", "Peter", "" ], [ "Keast", "Craig", "" ], [ "Sprinkle", "Mike", "" ], [ "Berger", "Claire", "" ], [ "de Heer", "Walt", "" ] ]
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801.2745
Gabriel Zarnauskas
M. R. Robilotta and G. R. S. Zarnauskas
Scalar form factors and nuclear interactions
Talk given at the 20EFB, Pisa, Italy, September 2007. 3 pages and 4 figures
Few Body Syst.44:121-124,2008
10.1007/s00601-008-0271-1
null
nucl-th
null
The scalar-isoscalar term in the two-pion exchange $NN$ potential is abnormally large and does not respect the hierarchy of effects predicted by chiral perturbation theory. We argue that this anomaly is associated with non-perturbative effects, which are also present in the $\pi N$ scalar form factor.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 18:27:19 GMT" } ]
2009-01-16T00:00:00
[ [ "Robilotta", "M. R.", "" ], [ "Zarnauskas", "G. R. S.", "" ] ]
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801.2746
Serge Koutchmy
Serge Koutchmy, Vladimir Slemzin, Boris Filippov, Jacques-Clair Noens, David Romeuf and Leon Golub
Analysis and interpretation of a fast limb CME with eruptive prominence, C-flare and EUV dimming
11 pages, 9 figures
null
10.1051/0004-6361:20078311
null
astro-ph
null
Coronal Mass ejections or CMEs are large dynamical solar-corona events. The mass balance and kinematics of a fast limb CME, including its prominence progenitor and the associated flare, will be compared with computed magnetic structures to look for their origin and effect. Multi-wavelength ground-based and space-borne observations are used to study a fast W-limb CME event of December 2, 2003, taking into account both on and off disk observations. Its erupting prominence is measured at high cadence with the Pic du Midi full H-alpha line-flux imaging coronagraph. EUV images from space instruments are processed including difference imaging. SOHO/LASCO images are used to study the mass excess and motions. A fast bright expanding coronal loop is identified in the region recorded slightly later by GOES as a C7.2 flare, followed by a brightening and an acceleration phase of the erupting material with both cool and hot components. The total coronal radiative flux dropped by 5 percent in the EUV channels, revealing a large dimming effect at and above the limb. The typical 3-part structure observed 1 hour later shows a core shaped similarly to the eruptive filament/prominence. The total measured mass of the escaping CME (1.5x10to16 g from C2 LASCO observations) definitely exceeds the estimated mass of the escaping cool prominence material although assumptions made to analyse the Ha erupting prominence, as well as the corresponding EUV darkening of the filament observed several days before, made this evaluation uncertain by a factor of 2. From the current free extrapolation we discuss the shape of the magnetic neutral surface and a possible scenario leading to an instability, including the small scale dynamics inside and around the filament.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 18:30:29 GMT" } ]
2009-11-13T00:00:00
[ [ "Koutchmy", "Serge", "" ], [ "Slemzin", "Vladimir", "" ], [ "Filippov", "Boris", "" ], [ "Noens", "Jacques-Clair", "" ], [ "Romeuf", "David", "" ], [ "Golub", "Leon", "" ] ]
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801.2747
Javier von Stecher
J. von Stecher, Chris H. Greene, D. Blume
Energetics and Structural Properties of Trapped Two-Component Fermi Gases
22 pages, 21 figures
null
10.1103/PhysRevA.77.043619
null
cond-mat.other
null
Using two different numerical methods, we study the behavior of two-component Fermi gases interacting through short-range s-wave interactions in a harmonic trap. A correlated Gaussian basis-set expansion technique is used to determine the energies and structural properties, i.e., the radial one-body densities and pair distribution functions, for small systems with either even or odd $N$, as functions of the s-wave scattering length and the mass ratio $\kappa$ of the two species. Particular emphasis is put on a discussion of the angular momentum of the system in the BEC-BCS crossover regime. At unitarity, the excitation spectrum of the four-particle system with total angular momentum L=0 is calculated as a function of the mass ratio $\kappa$. The results are analyzed from a hyperspherical perspective, which offers new insights into the problem. Additionally, fixed-node diffusion Monte Carlo calculations are performed for equal-mass Fermi gases with up to N=30 atoms. We focus on the odd-even oscillations of the ground state energy of the equal-mass unitary system having up to N=30 particles, which are related to the excitation gap of the system. Furthermore, we present a detailed analysis of the structural properties of these systems.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 18:36:49 GMT" } ]
2009-11-13T00:00:00
[ [ "von Stecher", "J.", "" ], [ "Greene", "Chris H.", "" ], [ "Blume", "D.", "" ] ]
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801.2748
Mark Kliger
Ami Wiesel, Mark Kliger and Alfred O. Hero III
A greedy approach to sparse canonical correlation analysis
5 pages, 3 pages
null
null
null
stat.CO stat.ME
null
We consider the problem of sparse canonical correlation analysis (CCA), i.e., the search for two linear combinations, one for each multivariate, that yield maximum correlation using a specified number of variables. We propose an efficient numerical approximation based on a direct greedy approach which bounds the correlation at each stage. The method is specifically designed to cope with large data sets and its computational complexity depends only on the sparsity levels. We analyze the algorithm's performance through the tradeoff between correlation and parsimony. The results of numerical simulation suggest that a significant portion of the correlation may be captured using a relatively small number of variables. In addition, we examine the use of sparse CCA as a regularization method when the number of available samples is small compared to the dimensions of the multivariates.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 18:53:07 GMT" } ]
2008-01-18T00:00:00
[ [ "Wiesel", "Ami", "" ], [ "Kliger", "Mark", "" ], [ "Hero", "Alfred O.", "III" ] ]
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801.2749
B. Glenn Piner
B. Glenn Piner, Niraj Pant, and Philip G. Edwards
The Parsec-Scale Jets of the TeV Blazars H 1426+428, 1ES 1959+650, and PKS 2155-304: 2001-2004
16 pages, Astrophysical Journal, in press
null
10.1086/533521
null
astro-ph
null
We present Very Long Baseline Array (VLBA) observations of the TeV blazars H 1426+428, 1ES 1959+650, and PKS 2155-304 obtained during the years 2001 through 2004. We observed H 1426+428 at four epochs at 8 GHz, and found that its parsec-scale structure consisted of a ~17 mJy core and a single ~3 mJy jet component with an apparent speed of 2.09 +/- 0.53c. The blazar 1ES 1959+650 was observed at three epochs at frequencies of 15 and 22 GHz. Spectral index information from these dual-frequency observations was used to definitively identify the core of the parsec-scale structure. PKS 2155-304 was observed at a single epoch at 15 GHz with dual-circular polarization, and we present the first VLBI polarimetry image of this source. For 1ES 1959+650 and PKS 2155-304, the current observations are combined with the VLBA observations from our earlier paper to yield improved apparent speed measurements for these sources with greatly reduced measurement errors. The new apparent speed measured for component C2 in 1ES 1959+650 is 0.00 +/- 0.04c (stationary), and the new apparent speed measured for component C1 in PKS 2155-304 is 0.93 +/- 0.31c. We combine the new apparent speed measurements from this paper with the apparent speeds measured in TeV blazar jets from our earlier papers to form a current set of apparent speed measurements in TeV HBLs. The mean peak apparent pattern speed in the jets of the TeV HBLs is about 1c. We conclude the paper with a detailed discussion of the interpretation of the collected VLBA data on TeV blazars in the context of current theoretical models for the parsec-scale structure of TeV blazar jets.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 19:34:02 GMT" } ]
2009-11-13T00:00:00
[ [ "Piner", "B. Glenn", "" ], [ "Pant", "Niraj", "" ], [ "Edwards", "Philip G.", "" ] ]
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801.275
Hiroyuki Nakano
Hiroyuki Nakano, Carlos O. Lousto (RIT)
New method to integrate 2+1 wave equations with Dirac's delta functions as sources
4 pages, 1 figure, prepared for the proceedings of the 17th workshop on general relativity and gravitation, Nagoya, Japan, Dec.3 - Dec.7, 2007
null
null
null
gr-qc
null
Gravitational perturbations in a Kerr black hole background can not be decomposed into simple tensor harmonics in the time domain. Here, we make the mode decomposition only in the azimuthal direction and discuss the resulting (2+1)-dimensional Klein-Gordon differential equation for scalar perturbations with a two dimensional Dirac's $\delta$-function as a source representing a point particle orbiting a much larger black hole. To make this equation amenable for numerical integrations we explicitly remove analytically the singular behavior of the source and compute a global effective source for the corresponding waveform.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 19:15:07 GMT" } ]
2008-01-18T00:00:00
[ [ "Nakano", "Hiroyuki", "", "RIT" ], [ "Lousto", "Carlos O.", "", "RIT" ] ]
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801.2751
Joseph Najnudel
Joseph Najnudel
Construction of an Edwards' probability measure on $\mathcal{C}(\mathbb{R}_+,\mathbb{R})$
Published in at http://dx.doi.org/10.1214/10-AOP540 the Annals of Probability (http://www.imstat.org/aop/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Annals of Probability 2010, Vol. 38, No. 6, 2295-2321
10.1214/10-AOP540
IMS-AOP-AOP540
math.PR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this article, we prove that the measures $\mathbb{Q}_T$ associated to the one-dimensional Edwards' model on the interval $[0,T]$ converge to a limit measure $\mathbb{Q}$ when $T$ goes to infinity, in the following sense: for all $s\geq0$ and for all events $\Lambda_s$ depending on the canonical process only up to time $s$, $\mathbb{Q}_T(\Lambda_s)\rightarrow\mathbb{Q}(\Lambda_s)$. Moreover, we prove that, if $\mathbb{P}$ is Wiener measure, there exists a martingale $(D_s)_{s\in\mathbb{R}_+}$ such that $\mathbb{Q}(\Lambda_s) =\mathbb{E}_{\mathbb{P}}(\mathbh{1}_{\Lambda_s}D_s)$, and we give an explicit expression for this martingale.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 19:27:53 GMT" }, { "version": "v2", "created": "Sat, 20 Feb 2010 00:35:04 GMT" }, { "version": "v3", "created": "Wed, 24 Nov 2010 06:34:07 GMT" } ]
2010-11-25T00:00:00
[ [ "Najnudel", "Joseph", "" ] ]
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801.2752
Henri Lehn
Georges Lochak (AFBL)
The Equation of a Light Leptonic Magnetic Monopole and its Experimental Aspects
null
Z.Naturforsch..A62:231-246,2007
null
null
quant-ph
null
The present theory is closely related to Dirac's equation of the electron, but not to his magnetic monopole theory, except for his relation between electric and magnetic charge. The theory is based on the fact, that the massless Dirac equation admits a second electromagnetic coupling, deduced from a pseudo-scalar gauge invariance. The equation thus obtained has the symmetry laws of a massless leptonic, magnetic monopole, able to interact weakly. We give a more precise form of the Dirac relation between electric and magnetic charges and a quantum form of the Poincare first integral. In the Weyl representation our equation splits into P-conjugated monopole and antimonopole equations with the correct electromagnetic coupling and opposite chiralities, predicted by P. Curie. Charge-conjugated monopoles are symmetric in space and not in time (contrary to the electric particles), an important fact for the vacuum polarization. Our monopoles are magnetically excited neutrinos, which leads to experimental consequences. These monopoles are assumed to be produced by electromagnetic pulses or arcs, leading to nuclear transmutations and, for beta radioactive elements, a shortening of the life time and the emission of monopoles instead of neutrinos in a magnetic field. A corresponding discussion is given.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 19:51:31 GMT" } ]
2008-11-26T00:00:00
[ [ "Lochak", "Georges", "", "AFBL" ] ]
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801.2753
Nadine Guillotin-Plantard
Cl\'ement Dombry (LMA), Nadine Guillotin-Plantard (ICJ)
Discrete approximation of a stable self-similar stationary increments process
31 pages
null
null
null
math.PR
null
The aim of this paper is to present a result of discrete approximation of some class of stable self-similar stationary increments processes. The properties of such processes were intensively investigated, but little is known on the context in which such processes can arise. To our knowledge, discretisation and convergence theorems are available only in the case of stable L\'evy motions and fractional Brownian motions. This paper yields new results in this direction. Our main result is the convergence of the random rewards schema, which was firstly introduced by Cohen and Samorodnitsky, and that we consider in a more general setting. Strong relationships with Kesten and Spitzer's random walk in random sceneries are evidenced. Finally, we study some path properties of the limit process.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 19:42:00 GMT" } ]
2008-01-18T00:00:00
[ [ "Dombry", "Clément", "", "LMA" ], [ "Guillotin-Plantard", "Nadine", "", "ICJ" ] ]
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801.2754
Patrice Bacchin
Benjamin Espinasse (LGC), Patrice Bacchin (LGC), Pierre Aimar (LGC)
Filtration method characterizing the reversibility of colloidal fouling layers at a membrane surface: analysis through critical flux and osmotic pressure
Journal of Colloid and Interface Science (2008) to be published
null
10.1016/j.jcis.2008.01.023
null
cond-mat.soft
null
A filtration procedure was developed to measure the reversibility of fouling during cross-flow filtration based on the square wave of applied pressure. The principle of this method, the apparatus required, and the associated mathematical relationships are detailed. This method allows for differentiating the reversible accumulation of matter on, and the irreversible fouling of, a membrane surface. Distinguishing these two forms of attachment to a membrane surface provides a means by which the critical flux may be determined. To validate this method, experiments were performed with a latex suspension at different degrees of destabilization (obtained by the addition of salt to the suspension) and at different cross-flow velocities. The dependence of the critical flux on these conditions is discussed and analysed through the osmotic pressure of the colloidal dispersion.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 19:44:50 GMT" } ]
2008-01-18T00:00:00
[ [ "Espinasse", "Benjamin", "", "LGC" ], [ "Bacchin", "Patrice", "", "LGC" ], [ "Aimar", "Pierre", "", "LGC" ] ]
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801.2755
Ludovic Dan Lemle
Ludovic Dan Lemle (ICJ)
$L^\infty$-Uniqueness of Generalized SCHR\"Odinger Operators
null
null
null
null
math-ph math.MP
null
The main purpose of this paper is to show that the generalized Schr\"odinger operator ${\cal A}^Vf={1/2}\Delta f+b\nabla f-Vf$, $f\in C_0^\infty(\R^d)$, is a pre-generator for which we can prove its $L^\infty(\R^d,dx)$-uniqueness. Moreover, we prove the $L^1(\R^d,dx)$-uniqueness of weak solutions for the Fokker-Planck equation associated with this pre-generator.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 19:45:49 GMT" } ]
2008-01-18T00:00:00
[ [ "Lemle", "Ludovic Dan", "", "ICJ" ] ]
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801.2756
Giampaolo Cristadoro
Giampaolo Cristadoro, Roland Ketzmerick
On universality of algebraic decays in Hamiltonian systems
4 pages, 3 figures
Phys. Rev. Lett. 100, 184101 (2008)
10.1103/PhysRevLett.100.184101
null
nlin.CD
null
Hamiltonian systems with a mixed phase space typically exhibit an algebraic decay of correlations and of Poincare' recurrences, with numerical experiments over finite times showing system-dependent power-law exponents. We conjecture the existence of a universal asymptotic decay based on results for a Markov tree model with random scaling factors for the transition probabilities. Numerical simulations for different Hamiltonian systems support this conjecture and permit the determination of the universal exponent.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 19:46:03 GMT" } ]
2008-10-06T00:00:00
[ [ "Cristadoro", "Giampaolo", "" ], [ "Ketzmerick", "Roland", "" ] ]
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801.2757
Martin Houde
Hua-bai Li (1) and Martin Houde (2) (1- Harvard-Smithsonian Center for Astrophysics, 2- The University of Western Ontario)
Probing the Turbulence Dissipation Range and Magnetic Field Strengths in Molecular Clouds
15 pages, 3 figures, accepted for publication in The Astrophysical Journal
null
10.1086/529581
null
astro-ph
null
We study the turbulent velocity dispersion spectra of the coexistent HCN and HCO+ molecular species as a function of length scale in the M17 star-forming molecular cloud. We show that the observed downward shift of the ion's spectrum relative to that of the neutral is readily explained by the existence of an ambipolar diffusion range within which ion and neutral turbulent energies dissipate differently. We use these observations to evaluate this decoupling scale and show how to estimate the strength of the plane-of-the-sky component of the embedded magnetic field in a completely novel way.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 19:49:19 GMT" } ]
2009-11-13T00:00:00
[ [ "Li", "Hua-bai", "" ], [ "Houde", "Martin", "" ] ]
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801.2758
Werner Krauth
Markus Holzmann, Maguelonne Chevallier, Werner Krauth
Semiclassical theory of the quasi two-dimensional trapped Bose gas
5 pages, 3 figures
Europhysics Letters 82, 30001 (2008)
10.1209/0295-5075/82/30001
null
cond-mat.stat-mech
null
We discuss the quasi two-dimensional trapped Bose gas where the thermal occupation of excited states in the tightly confined direction is small but remains finite in the thermodynamic limit. We show that the semiclassical theory describes very accurately the density profile obtained by Quantum Monte Carlo calculations in the normal phase above the Kosterlitz--Thouless temperature T_KT, but differs strongly from the predictions of strictly two-dimensional mean-field theory, even at relatively high temperature. We discuss the relevance of our findings for analyzing ultra-cold-atom experiments in quasi two-dimensional traps.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 20:20:33 GMT" } ]
2009-11-13T00:00:00
[ [ "Holzmann", "Markus", "" ], [ "Chevallier", "Maguelonne", "" ], [ "Krauth", "Werner", "" ] ]
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801.2759
Rachel Dudik Ms.
S. Satyapal, D. Vega, R. P. Dudik, N. P. Abel, T. Heckman
Spitzer Uncovers Active Galactic Nuclei Missed by Optical Surveys in 7 Late-type Galaxies
8 figures, 17 pages, astro-ph\0801.2766 (Abel & Satyapal 2008; ApJ accepted) and this posting designed to form a two-part investigation
null
10.1086/529014
null
astro-ph
null
We report the discovery using Spitzers high resolution spectrograph of 7 Active Galactic Nuclei (AGN) in a sample of 32 late-type galaxies that show no definitive signatures of AGN in their optical spectra. Our observations suggest that the AGN detection rate in late-type galaxies is possibly 4 times larger than what optical spectroscopic observations alone suggest. We demonstrate using photoionization models with an input AGN and an extreme EUV-bright starburst ionizing radiation field that the observed mid-infrared line ratios cannot be replicated unless an AGN contribution, in some cases as little as 10% of the total galaxy luminosity, is included. These models show that when the fraction of the total luminosity due to the AGN is low, optical diagnostics are insensitive to the presence of the AGN. In this regime of parameter space, the mid-infrared diagnostics offer a powerful tool for uncovering AGN missed by optical spectroscopy. The AGN bolometric luminosities in our sample range from ~3 X 10^41 - ~2 X 10^43 ergs s^-1, which, based on the Eddington limit, corresponds to a lower mass limit for the black hole that ranges from ~3 X 10^3Mdot to as high as ~1.5 X 10^5Mdot. These lower mass limits however do not put a strain on the well-known relationship between the black hole mass and the host galaxy's stellar velocity dispersion established in predominantly early-type galaxies. Our findings add to the growing evidence that black holes do form and grow in low-bulge environments and that they are significantly more common than optical studies indicate.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 20:34:05 GMT" }, { "version": "v2", "created": "Fri, 18 Jan 2008 16:59:43 GMT" } ]
2009-11-13T00:00:00
[ [ "Satyapal", "S.", "" ], [ "Vega", "D.", "" ], [ "Dudik", "R. P.", "" ], [ "Abel", "N. P.", "" ], [ "Heckman", "T.", "" ] ]
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801.276
John Dudley
John. M. Dudley, Goery Genty and Benjamin J. Eggleton
Harnessing and control of optical rogue waves in supercontinuum generation
Submitted for Publication (2008)
null
10.1364/OE.16.003644
null
physics.optics
null
We present a numerical study of the evolution dynamics of ``optical rogue waves'', statistically-rare extreme red-shifted soliton pulses arising from supercontinuum generation in photonic crystal fiber [D. R. Solli et al. Nature Vol. 450, 1054-1058 (2007)]. Our specific aim is to use nonlinear Schrodinger equation simulations to identify ways in which the rogue wave dynamics can be actively controlled, and we demonstrate that rogue wave generation can be enhanced by an order of magnitude through a small modulation across the input pulse envelope and effectively suppressed through the use of a sliding frequency filter.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 20:41:15 GMT" } ]
2009-11-13T00:00:00
[ [ "Dudley", "John. M.", "" ], [ "Genty", "Goery", "" ], [ "Eggleton", "Benjamin J.", "" ] ]
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801.2761
Lev Vaidman
L. Vaidman
Protective Measurements
An entry in the Compendium of Quantum Physics: Concepts, Experiments, History and Philosophy, ed. F. Weinert, K. Hentschel, D. Greenberger and B. Falkenburg
null
null
null
quant-ph
null
A review of protective measurements. Protective measurement is a method for measuring an expectation value of an observable on a single quantum system. The quantum state of the system can be protected by a potential, when the state is a nondegenerate energy eigenstate with a known gap to neighboring states, or via Zeno effect by frequent projection measurements.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 20:41:37 GMT" } ]
2008-01-18T00:00:00
[ [ "Vaidman", "L.", "" ] ]
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801.2762
Kai Schwenzer
Reinhard Alkofer, Markus Q. Huber and Kai Schwenzer
Infrared singularities in Landau gauge Yang-Mills theory
29 pages, 25 figures; published version
Phys.Rev.D81:105010,2010
10.1103/PhysRevD.81.105010
null
hep-th hep-lat hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a more detailed picture of the infrared regime of Landau gauge Yang-Mills theory. This is done within a novel framework that allows one to take into account the influence of finite scales within an infrared power counting analysis. We find that there are two qualitatively different infrared fixed points of the full system of Dyson-Schwinger equations. The first extends the known scaling solution, where the ghost dynamics is dominant and gluon propagation is strongly suppressed. It features in addition to the strong divergences of gluonic vertex functions in the previously considered uniform scaling limit, when all external momenta tend to zero, also weaker kinematic divergences, when only some of the external momenta vanish. The second solution represents the recently proposed decoupling scenario where the gluons become massive and the ghosts remain bare. In this case we find that none of the vertex functions is enhanced, so that the infrared dynamics is entirely suppressed. Our analysis also provides a strict argument why the Landau gauge gluon dressing function cannot be infrared divergent.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 20:49:22 GMT" }, { "version": "v2", "created": "Fri, 24 Oct 2008 17:27:29 GMT" }, { "version": "v3", "created": "Fri, 29 Jan 2010 22:46:03 GMT" }, { "version": "v4", "created": "Tue, 11 May 2010 02:16:56 GMT" } ]
2010-05-19T00:00:00
[ [ "Alkofer", "Reinhard", "" ], [ "Huber", "Markus Q.", "" ], [ "Schwenzer", "Kai", "" ] ]
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801.2763
Fabio Riccioni
Fabio Riccioni, Antoine Van Proeyen and Peter West
Real forms of very extended Kac-Moody algebras and theories with eight supersymmetries
46 pages, 25 figures. Refs added, one appendix included, one figure added
JHEP 0805:079,2008
10.1088/1126-6708/2008/05/079
KCL-MTH-08-01, KUL-TF-08/02
hep-th
null
We consider all theories with eight supersymmetries whose reduction to three dimensions gives rise to scalars that parametrise symmetric manifolds. We conjecture that these theories are non-linear realisations of very-extended Kac-Moody algebras for suitable choices of real forms. We show for the most interesting cases that the bosonic sector of the supersymmetric theory is precisely reproduced by the corresponding non-linear realisation.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 20:50:07 GMT" }, { "version": "v2", "created": "Fri, 18 Jan 2008 16:51:40 GMT" }, { "version": "v3", "created": "Tue, 19 Feb 2008 18:12:50 GMT" } ]
2014-11-18T00:00:00
[ [ "Riccioni", "Fabio", "" ], [ "Van Proeyen", "Antoine", "" ], [ "West", "Peter", "" ] ]
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801.2764
Joshua Younger
J. D. Younger, J. S. Dunlop, A. B. Peck, R. J. Ivison, A. D. Biggs, E. L. Chapin, D. L. Clements, S. Dye, T. R. Greve, D. H. Hughes, D. Iono, I. Smail, M. Krips, G. R. Petitpas, D. Wilner, A. M. Schael, and C. D. Wilson
Clarifying the nature of the brightest submillimetre sources: interferometric imaging of LH850.02
MNRAS, in press
null
10.1111/j.1365-2966.2008.13241.x
null
astro-ph
null
We present high-resolution interferometric imaging of LH850.02, the brightest 850- and 1200-micron submillimetre (submm) galaxy in the Lockman Hole. Our observations were made at 890 micron with the Submillimetre Array (SMA). Our high-resolution submm imaging detects LH850.02 at >6-sigma as a single compact (size < 1 arcsec or < 8 kpc) point source and yields its absolute position to ~0.2-arcsec accuracy. LH850.02 has two alternative radio counterparts within the SCUBA beam (LH850.02N & S), both of which are statistically very unlikely to be so close to the SCUBA source position by chance. However, the precise astrometry from the SMA shows that the submm emission arises entirely from LH850.02N, and is not associated with LH850.02S (by far the brighter of the two alternative identifications at 24-micron). Fits to the optical-infrared multi-colour photometry of LH850.02N & S indicate that both lie at z~3.3, and are therefore likely to be physically associated. At these redshifts, the 24 micron--to--submm flux density ratios suggest that LH850.02N has an Arp220-type starburst-dominated far-IR SED, while LH850.02S is more similar to Mrk231, with less dust-enshrouded star-formation activity, but a significant contribution at 24-micron (rest-frame ~5-6 micron) from an active nucleus. This complex mix of star-formation and AGN activity in multi-component sources may be common in the high redshift ultraluminous galaxy population, and highlights the need for precise astrometry from high resolution interferometric imaging for a more complete understanding.
[ { "version": "v1", "created": "Fri, 18 Jan 2008 20:21:31 GMT" }, { "version": "v2", "created": "Fri, 4 Apr 2008 17:59:43 GMT" } ]
2009-11-13T00:00:00
[ [ "Younger", "J. D.", "" ], [ "Dunlop", "J. S.", "" ], [ "Peck", "A. B.", "" ], [ "Ivison", "R. J.", "" ], [ "Biggs", "A. D.", "" ], [ "Chapin", "E. L.", "" ], [ "Clements", "D. L.", "" ], [ "Dye", "S.", "" ], [ "Greve", "T. R.", "" ], [ "Hughes", "D. H.", "" ], [ "Iono", "D.", "" ], [ "Smail", "I.", "" ], [ "Krips", "M.", "" ], [ "Petitpas", "G. R.", "" ], [ "Wilner", "D.", "" ], [ "Schael", "A. M.", "" ], [ "Wilson", "C. D.", "" ] ]
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801.2765
Jeffrey Bary
Jeffrey S. Bary, David A. Weintraub, Sonali J. Shukla, Jarron M. Leisenring, and Joel H. Kastner
Quiescent H2 Emission From Pre-Main Sequence Stars in Chamaeleon I
12 pages, emulateapj, Accepted by ApJ
null
10.1086/529517
null
astro-ph
null
We report the discovery of quiescent emission from molecular hydrogen gas located in the circumstellar disks of six pre-main sequence stars, including two weak-line T Tauri stars (TTS), and one Herbig AeBe star, in the Chamaeleon I star forming region. For two of these stars, we also place upper limits on the 2->1 S(1)/1->0 S(1) line ratios of 0.4 and 0.5. Of the 11 pre-main sequence sources now known to be sources of quiescent near-infrared hydrogen emission, four possess transitional disks, which suggests that detectable levels of H$_2$ emission and the presence of inner disk holes are correlated. These H$_2$ detections demonstrate that these inner holes are not completely devoid of gas, in agreement with the presence of observable accretion signatures for all four of these stars and the recent detections of [Ne II] emission from three of them. The overlap in [Ne II] and H$_2$ detections hints at a possible correlation between these two features and suggests a shared excitation mechanism of high energy photons. Our models, combined with the kinematic information from the H$_2$ lines, locate the bulk of the emitting gas at a few tens of AU from the stars. We also find a correlation between H$_2$ detections and those targets which possess the largest H$\alpha$ equivalent widths, suggesting a link between accretion activity and quiescent H$_2$ emission. We conclude that quiescent H$_2$ emission from relatively hot gas within the disks of TTS is most likely related to on-going accretion activity, the production of UV photons and/or X-rays, and the evolutionary status of the dust grain populations in the inner disks.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 21:00:42 GMT" } ]
2009-11-13T00:00:00
[ [ "Bary", "Jeffrey S.", "" ], [ "Weintraub", "David A.", "" ], [ "Shukla", "Sonali J.", "" ], [ "Leisenring", "Jarron M.", "" ], [ "Kastner", "Joel H.", "" ] ]
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801.2766
Nicholas Abel
N. P. Abel, S. Satyapal
[Ne V] Emission in Optically Classified Starbursts
16 pages, 3 figures, accepted for publication in ApJ; astro-ph\0801.2759 (Satyapal et al. 2008; ApJ accepted) and this posting designed to form a two-part investigation
null
10.1086/529013
null
astro-ph
null
Detecting Active Galactic Nuclei (AGN) in galaxies dominated by powerful nuclear star formation and extinction effects poses a unique challenge. Due to the longer wavelength emission and the ionization potential of Ne^3+, infrared [Ne V] emission lines are thought to be excellent AGN diagnostics. However, stellar evolution models predict Wolf-Rayet stars in young stellar clusters emit significant numbers of photons capable of creating Ne^4+. Recent observations of [Ne V] emission in optically classified starburst galaxies require us to investigate whether [Ne V] can arise from star-formation activity and not an AGN. In this work, we calculate the optical and IR spectrum of gas exposed to a young starburst and AGN SED. We find: 1) a range of parameters where [Ne V] emission can be explained solely by star-formation and 2) a range of relative AGN to starburst luminosities that reproduce the [Ne V] observations, yet leaves the optical spectrum looking like a starburst. We also find infrared emission-line diagnostics are much more sensitive to the AGN than optical diagnostics, particularly for weak AGN. We apply our model to the optically classified, yet [Ne V] emitting, starburst galaxy NGC 3621. We find, when taking the IR and optical spectrum into account, about 30 - 50% of the galaxy's total luminosity is due to an AGN. Our calculations show that [Ne V] emission is almost always the result of AGN activity. The models presented in this work can be used to determine the AGN contribution to a galaxy's power output.
[ { "version": "v1", "created": "Fri, 18 Jan 2008 02:37:21 GMT" } ]
2009-11-13T00:00:00
[ [ "Abel", "N. P.", "" ], [ "Satyapal", "S.", "" ] ]
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801.2767
Jeronimo Bernard-Salas
S.R. Pottasch, J. Bernard-Salas, T.L. Roellig
Abundances of Planetary Nebula NGC2392
9 pages, 7 tables, 3 figures. Accepted for publication in A&A
null
10.1051/0004-6361:20079041
null
astro-ph
null
The spectra of the planetary nebula NGC2392 is reanalysed using spectral measurements made in the mid-infrared with the Spitzer Space Telescope. The aim is to determine the chemical composition of this object. We also make use of IUE and ground based spectra. Abundances determined from the mid-infrared lines, which are insensitive to electron temperature, are used as the basis for the determination of the composition, which are found to differ somewhat from earlier results. The abundances found, especially the low value of helium and oxygen, indicate that the central star was originally of rather low mass. Abundances of phosphorus, iron, silicon and chlorine have been determined for the first time in this nebula. The variation of electron temperature in this nebula is very clear reaching quite high values close to the center. The temperature of the central star is discussed in the light of the high observed stages of ionization. The nebular information indicates the spectrum of the star deviates considerably from a blackbody.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 21:01:07 GMT" } ]
2009-11-13T00:00:00
[ [ "Pottasch", "S. R.", "" ], [ "Bernard-Salas", "J.", "" ], [ "Roellig", "T. L.", "" ] ]
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801.2768
Ladislav Subr
L. Subr, P. Kroupa, H. Baumgardt
A new method to create initially mass segregated star clusters in virial equilibrium
9 pages, 8 figures, accepted for publication in MNRAS
null
10.1111/j.1365-2966.2008.12993.x
null
astro-ph
null
Mass segregation stands as one of the most robust features of the dynamical evolution of self-gravitating star clusters. In this paper we formulate parametrised models of mass segregated star clusters in virial equilibrium. To this purpose we introduce mean inter-particle potentials for statistically described unsegregated systems and suggest a single-parameter generalisation of its form which gives a mass-segregated state. We describe an algorithm for construction of appropriate star cluster models. Their stability over several crossing-times is verified by following the evolution by means of direct N-body integration.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 21:01:11 GMT" } ]
2009-11-13T00:00:00
[ [ "Subr", "L.", "" ], [ "Kroupa", "P.", "" ], [ "Baumgardt", "H.", "" ] ]
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801.2769
Darren Croton J
Antonio D. Montero-Dorta, Darren J. Croton, Renbin Yan, Michael C. Cooper, Jeffery A. Newman, Antonis Georgakakis, Francisco Prada, Marc Davis, Kirpal Nandra, Alison Coil
The DEEP2 Galaxy Redshift Survey: The Red Sequence AGN Fraction and its Environment and Redshift Dependence
11 pages, 7 figures, submitted to MNRAS
null
10.1111/j.1365-2966.2008.13893.x
null
astro-ph
null
We measure the dependence of the AGN fraction on local environment at z~1, using spectroscopic data taken from the DEEP2 Galaxy Redshift Survey, and Chandra X-ray data from the All-Wavelength Extended Groth Strip International Survey (AEGIS). To provide a clean sample of AGN we restrict our analysis to the red sequence population; this also reduces additional colour-environment correlations. We find evidence that high redshift LINERs in DEEP2 tend to favour higher density environments relative to the red population from which they are drawn. In contrast, Seyferts and X-ray selected AGN at z~1 show little (or no) environmental dependencies within the same underlying population. We compare these results with a sample of local AGN drawn from the SDSS. Contrary to the high redshift behaviour, we find that both LINERs and Seyferts in the SDSS show a slowly declining red sequence AGN fraction towards high density environments. Interestingly, at z~1 red sequence Seyferts and LINERs are approximately equally abundant. By z~0, however, the red Seyfert population has declined relative to the LINER population by over a factor of 7. We speculate on possible interpretations of our results.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 21:02:04 GMT" } ]
2009-11-13T00:00:00
[ [ "Montero-Dorta", "Antonio D.", "" ], [ "Croton", "Darren J.", "" ], [ "Yan", "Renbin", "" ], [ "Cooper", "Michael C.", "" ], [ "Newman", "Jeffery A.", "" ], [ "Georgakakis", "Antonis", "" ], [ "Prada", "Francisco", "" ], [ "Davis", "Marc", "" ], [ "Nandra", "Kirpal", "" ], [ "Coil", "Alison", "" ] ]
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801.277
Claudio Dalla Vecchia
Claudio Dalla Vecchia, Joop Schaye (Leiden Observatory)
Simulating galactic outflows with kinetic supernova feedback
15 pages, 11 figures, accepted for publication in MNRAS. Added 4 new figures and made minor textual changes. Simulation videos available at http://www.strw.leidenuniv.nl/DS08/
Mon.Not.Roy.Astron.Soc.387:1431,2008
10.1111/j.1365-2966.2008.13322.x
null
astro-ph
null
Feedback from star formation is thought to play a key role in the formation and evolution of galaxies, but its implementation in cosmological simulations is currently hampered by a lack of numerical resolution. We present and test a sub-grid recipe to model feedback from massive stars in cosmological smoothed particle hydrodynamics simulations. The energy is distributed in kinetic form among the gas particles surrounding recently formed stars. The impact of the feedback is studied using a suite of high-resolution simulations of isolated disc galaxies embedded in dark halos with total mass 10^{10} and 10^{12} Msol/h. We focus in particular on the effect of pressure forces on wind particles within the disc, which we turn off temporarily in some of our runs to mimic a recipe that has been widely used in the literature. We find that this popular recipe gives dramatically different results because (ram) pressure forces on expanding superbubbles determine both the structure of the disc and the development of large-scale outflows. Pressure forces exerted by expanding superbubbles puff up the disc, giving the dwarf galaxy an irregular morphology and creating a galactic fountain in the massive galaxy. Hydrodynamic drag within the disc results in a strong increase of the effective mass loading of the wind for the dwarf galaxy, but quenches much of the outflow in the case of the high-mass galaxy.
[ { "version": "v1", "created": "Fri, 18 Jan 2008 10:45:05 GMT" }, { "version": "v2", "created": "Wed, 7 May 2008 13:21:47 GMT" } ]
2011-06-29T00:00:00
[ [ "Vecchia", "Claudio Dalla", "", "Leiden Observatory" ], [ "Schaye", "Joop", "", "Leiden Observatory" ] ]
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801.2771
Darren Croton J
Darren J. Croton, Glennys R. Farrar
Where do "red and dead" early-type void galaxies come from?
6 pages, 3 figures, accepted MNRAS
Mon.Not.Roy.Astron.Soc.386:2285-2289,2008
10.1111/j.1365-2966.2008.13204.x
null
astro-ph
null
Void regions of the Universe offer a special environment for studying cosmology and galaxy formation, which may expose weaknesses in our understanding of these phenomena. Although galaxies in voids are observed to be predominately gas rich, star forming and blue, a sub-population of bright red void galaxies can also be found, whose star formation was shut down long ago. Are the same processes that quench star formation in denser regions of the Universe also at work in voids? We compare the luminosity function of void galaxies in the 2dF Galaxy Redshift Survey, to those from a galaxy formation model built on the Millennium Simulation. We show that a global star formation suppression mechanism in the form of low luminosity "radio mode" AGN heating is sufficient to reproduce the observed population of void early-types. Radio mode heating is environment independent other than its dependence on dark matter halo mass, where, above a critical mass threshold of approximately M_vir~10^12.5 M_sun, gas cooling onto the galaxy is suppressed and star formation subsequently fades. In the Millennium Simulation, the void halo mass function is shifted with respect to denser environments, but still maintains a high mass tail above this critical threshold. In such void halos, radio mode heating remains efficient and red galaxies are found; collectively these galaxies match the observed space density without any modification to the model. Consequently, galaxies living in vastly different large-scale environments but hosted by halos of similar mass are predicted to have similar properties, consistent with observations.
[ { "version": "v1", "created": "Fri, 18 Jan 2008 20:35:41 GMT" }, { "version": "v2", "created": "Fri, 18 Jan 2008 22:24:22 GMT" }, { "version": "v3", "created": "Fri, 30 May 2008 06:37:50 GMT" } ]
2008-12-18T00:00:00
[ [ "Croton", "Darren J.", "" ], [ "Farrar", "Glennys R.", "" ] ]
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801.2772
Tanja Cuk
T. Cuk, V. Struzhkin, T.P. Devereaux, A. Goncharov, C. Kendziora, H. Eisaki, H. Mao, and Z.-X. Shen
Uncovering a pressure-tuned electronic transition in BiSrYCu2O8 using Raman scattering and x-ray diffraction
5 pages, 4 figures, submitted to PRL
null
10.1103/PhysRevLett.100.217003
null
cond-mat.supr-con
null
We report pressure tuned Raman and x-ray diffraction data of Bi1.98Sr2.06Y0.68Cu2O8 revealing a critical pressure at 21 GPa with anomalies in six physical quantities: electronic Raman background, electron-phonon coupling, spectral weight transfer from high to low frequency, density dependent behaviour of phonon and magnon frequencies, and a compressibility change in the c-axis. For the first time in a cuprate, mobile charge carriers, lattice, and magnetism all show anomalies at a distinct critical pressure in the same experimental setting. Furthermore, the Raman spectral changes are similar to that seen traversing the superconducting dome with doping, suggesting that the critical pressure at 21 GPa is related to the much discussed critical point at optimal doping.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 21:27:52 GMT" } ]
2009-11-13T00:00:00
[ [ "Cuk", "T.", "" ], [ "Struzhkin", "V.", "" ], [ "Devereaux", "T. P.", "" ], [ "Goncharov", "A.", "" ], [ "Kendziora", "C.", "" ], [ "Eisaki", "H.", "" ], [ "Mao", "H.", "" ], [ "Shen", "Z. -X.", "" ] ]
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