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802.2403
Hylke Koers
Hylke B. J. Koers, Peter Tinyakov
On the relation between the neutrino flux from Centaurus A and the associated diffuse neutrino flux
12 pages, 5 figures, revtex4. Accepted for publication in PRD. (v2) Expanded significantly compared to the previous version; conclusions remain valid
Phys.Rev.D78:083009,2008
10.1103/PhysRevD.78.083009
Preprint ULB-TH/08-03
astro-ph hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Based on recent results obtained by the Pierre Auger Observatory (PAO), it has been hypothesized that Centaurus A (Cen A) is a source of ultra-high-energy cosmic rays (UHECRs) and associated neutrinos. We point out that the diffuse neutrino flux may be used to constrain the source model if one assumes that the ratio between the UHECR and neutrino fluxes outputted by Cen A is representative for other sources. Under this assumption we investigate the relation between the neutrino flux from Cen A and the diffuse neutrino flux. Assuming furthermore that Cen A is the source of two UHECR events observed by PAO, we estimate the all-sky diffuse neutrino flux to be ~200-5000 times larger than the neutrino flux from Cen A. As a result, the diffuse neutrino fluxes associated with some of the recently proposed models of UHECR-related neutrino production in Cen A are above existing limits. Regardless of the underlying source model, our results indicate that the detection of neutrinos from Cen A without the accompanying diffuse flux would mean that Cen A is an exceptionally efficient neutrino source.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 20:05:05 GMT" }, { "version": "v2", "created": "Sun, 5 Oct 2008 17:06:38 GMT" } ]
"2010-04-21T00:00:00"
[ [ "Koers", "Hylke B. J.", "" ], [ "Tinyakov", "Peter", "" ] ]
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802.2404
Aaron O'Connell
Aaron D. O'Connell, M. Ansmann, R. C. Bialczak, M. Hofheinz, N. Katz, Erik Lucero, C. McKenney, M. Neeley, H. Wang, E. M. Weig, A. N. Cleland, and J. M. Martinis
Microwave Dielectric Loss at Single Photon Energies and milliKelvin Temperatures
4 pages, 3 figures, submitted to Applied Physics Letters
null
10.1063/1.2898887
null
cond-mat.supr-con
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The microwave performance of amorphous dielectric materials at very low temperatures and very low excitation strengths displays significant excess loss. Here, we present the loss tangents of some common amorphous and crystalline dielectrics, measured at low temperatures (T < 100 mK) with near single-photon excitation energies, using both coplanar waveguide (CPW) and lumped LC resonators. The loss can be understood using a two-level state (TLS) defect model. A circuit analysis of the half-wavelength resonators we used is outlined, and the energy dissipation of such a resonator on a multilayered dielectric substrate is considered theoretically.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 00:38:50 GMT" } ]
"2009-11-13T00:00:00"
[ [ "O'Connell", "Aaron D.", "" ], [ "Ansmann", "M.", "" ], [ "Bialczak", "R. C.", "" ], [ "Hofheinz", "M.", "" ], [ "Katz", "N.", "" ], [ "Lucero", "Erik", "" ], [ "McKenney", "C.", "" ], [ "Neeley", "M.", "" ], [ "Wang", "H.", "" ], [ "Weig", "E. M.", "" ], [ "Cleland", "A. N.", "" ], [ "Martinis", "J. M.", "" ] ]
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802.2405
Scott Fleming
S.W. Fleming, S.R. Kane, P.R. McCullough, F.R. Chromey
Detecting "Temperate" Jupiters: The Prospects of Searching for Transiting Gas Giants in Habitability Zones
14 pages, 12 figures, 4 tables, accepted to MNRAS
null
10.1111/j.1365-2966.2008.13120.x
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper investigates the effects of observing windows on detecting transiting planets by calculating the fraction of planets with a given period that have zero, one (single), two (double), or $\ge$3 (multiple) transits occurring while observations are being taken. We also investigate the effects of collaboration by performing the same calculations with combined observing times from two wide-field transit survey groups. For a representative field of the 2004 observing season, both XO and SuperWASP experienced an increase in single and double transit events by up to 20-40% for planets with periods 14 < P < 150 days when collaborating by sharing data. For the XO Project using its data alone, between 20-40% of planets with periods 14-150 days should have been observed at least once. For the SuperWASP Project, 50-90% of planets with periods between 14-150 days should have been observed at least once. If XO and SuperWASP combined their observations, 50-100% of planets with periods less than 20 days should be observed three or more times. We find that in general wide-field transit surveys have selected appropriate observing strategies to observe a significant fraction of transiting giant planets with semimajor axes larger than the Hot Jupiter regime. The actual number of intermediate-period transiting planets that are detected depends upon their true semimajor axis distribution and the signal-to-noise of the data.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 01:09:43 GMT" } ]
"2009-11-13T00:00:00"
[ [ "Fleming", "S. W.", "" ], [ "Kane", "S. R.", "" ], [ "McCullough", "P. R.", "" ], [ "Chromey", "F. R.", "" ] ]
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802.2406
Reg Cahill
Reginald T Cahill, Finn Stokes (Flinders University)
Correlated Detection of sub-mHz Gravitational Waves by Two Optical-Fiber Interferometers
15 pages, 17 colored figures
Progr.Phys.2:103-110,2008
null
null
physics.gen-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Results from two optical-fiber gravitational-wave interferometric detectors are reported. The detector design is very small, cheap and simple to build and operate. Using two detectors has permitted various tests of the design principles as well as demonstrating the first simultaneous detection of correlated gravitational waves from detectors spatially separated by 1.1km. The frequency spectrum of the detected gravitational waves is sub-mHz with a strain spectral index a=-1.4 +/- 0.1. As well as characterising the wave effects the detectors also show, from data collected over some 80 days in the latter part of 2007, the dominant earth rotation effect and the earth orbit effect. The detectors operate by exploiting light speed anisotropy in optical-fibers. The data confirms previous observations of light speed anisotropy, earth rotation and orbit effects, and gravitational waves.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 01:09:08 GMT" } ]
"2008-11-26T00:00:00"
[ [ "Cahill", "Reginald T", "", "Flinders University" ], [ "Stokes", "Finn", "", "Flinders University" ] ]
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802.2407
Alexej Bagrets
Chen Li, Ilya Pobelov, Thomas Wandlowski, Alexei Bagrets, Andreas Arnold, and Ferdinand Evers
Charge Transport in Single Au|Alkanedithiol|Au Junctions: Coordination Geometries and Conformational Degrees of Freedom
19 pages, 9 figures, 1 table; published version
J. Am. Chem. Soc. 2008, 130, 318-326
10.1021/ja0762386
null
cond-mat.mtrl-sci
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Recent STM molecular break-junction experiments have revealed multiple series of peaks in the conductance histograms of alkanedithiols. To resolve a current controversy, we present here an in-depth study of charge transport properties of Au|alkanedithiol|Au junctions. Conductance histograms extracted from our STM measurements unambiguously confirm features showing more than one set of junction configurations. Based on quantum chemistry calculations, we propose that certain combinations of different sulfur-gold couplings and trans/gauche conformations act as the driving agents. The present study may have implications for experimental methodology: whenever conductances of different junction conformations are not statistically independent, the conductance histogram technique can exhibit a single series only, even though a much larger abundance of microscopic realizations exists.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 01:20:06 GMT" } ]
"2008-02-19T00:00:00"
[ [ "Li", "Chen", "" ], [ "Pobelov", "Ilya", "" ], [ "Wandlowski", "Thomas", "" ], [ "Bagrets", "Alexei", "" ], [ "Arnold", "Andreas", "" ], [ "Evers", "Ferdinand", "" ] ]
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802.2408
Terence C. Tao
Terence Tao
Why are solitons stable?
33 pages, no figures, submitted, Bulletin of the AMS. Minor corrections
null
null
null
math.AP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The theory of linear dispersive equations predicts that waves should spread out and disperse over time. However, it is a remarkable phenomenon, observed both in theory and practice, that once nonlinear effects are taken into account, \emph{solitary wave} or \emph{soliton} solutions can be created, which can be stable enough to persist indefinitely. The construction of such solutions is relatively straightforward, but the fact that they are \emph{stable} requires some significant amounts of analysis to establish, in part due to symmetries in the equation (such as translation invariance) which create degeneracy in the stability analysis. The theory is particularly difficult in the \emph{critical} case in which the nonlinearity is at exactly the right power to potentially allow for a self-similar blowup. In this article we survey some of the highlights of this theory, from the more classical orbital stability analysis of Weinstein and Grillakis-Shatah-Strauss, to the more recent asymptotic stability and blowup analysis of Martel-Merle and Merle-Raphael, as well as current developments in using this theory to rigorously demonstrate controlled blowup for several key equations.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 02:26:54 GMT" }, { "version": "v2", "created": "Wed, 20 Feb 2008 18:43:48 GMT" } ]
"2008-02-20T00:00:00"
[ [ "Tao", "Terence", "" ] ]
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802.2409
Youngman Kim
Youngman Kim and Hyun Kyu Lee
Consequences of the partial restoration of chiral symmetry in AdS/QCD
11 pages, 6 figures
Phys.Rev.D77:096011,2008
10.1103/PhysRevD.77.096011
null
hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Chiral symmetry is an essential concept in understanding QCD at low energy. We treat the chiral condensate, which measures the spontaneous breaking of chiral symmetry, as a free parameter to investigate the effect of partially restored chiral symmetry on the physical quantities in the frame work of an AdS/QCD model. We observe an interesting scaling behavior among the nucleon mass, pion decay constant and chiral condensate. We propose a phenomenological way to introduce the temperature dependence of a physical quantity in the AdS/QCD model with the thermal AdS metric.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 02:44:31 GMT" } ]
"2008-11-26T00:00:00"
[ [ "Kim", "Youngman", "" ], [ "Lee", "Hyun Kyu", "" ] ]
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802.241
Lev Kaplan
L. Kaplan and Y. Alhassid
Interaction Matrix Element Fluctuations in Ballistic Quantum Dots: Random Wave Model
13 pages, 10 figures
Phys. Rev. B 78, 085305 (2008)
10.1103/PhysRevB.78.085305
null
cond-mat.mes-hall nlin.CD nucl-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study matrix element fluctuations of the two-body screened Coulomb interaction and of the one-body surface charge potential in ballistic quantum dots. For chaotic dots, we use a normalized random wave model to obtain analytic expansions for matrix element variances and covariances in the limit of large kL (where k is the Fermi wave number and L the linear size of the dot). These leading-order analytical results are compared with exact numerical results. Both two-body and one-body matrix elements are shown to follow strongly non-Gaussian distributions, despite the Gaussian random nature of the single-electron wave functions.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 03:36:30 GMT" } ]
"2009-09-21T00:00:00"
[ [ "Kaplan", "L.", "" ], [ "Alhassid", "Y.", "" ] ]
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802.2411
Mahesh Pal Dr.
Mahesh Pal
Multiclass Approaches for Support Vector Machine Based Land Cover Classification
16 pages, MapIndia 2005 conference
null
null
null
cs.NE cs.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
SVMs were initially developed to perform binary classification; though, applications of binary classification are very limited. Most of the practical applications involve multiclass classification, especially in remote sensing land cover classification. A number of methods have been proposed to implement SVMs to produce multiclass classification. A number of methods to generate multiclass SVMs from binary SVMs have been proposed by researchers and is still a continuing research topic. This paper compares the performance of six multi-class approaches to solve classification problem with remote sensing data in term of classification accuracy and computational cost. One vs. one, one vs. rest, Directed Acyclic Graph (DAG), and Error Corrected Output Coding (ECOC) based multiclass approaches creates many binary classifiers and combines their results to determine the class label of a test pixel. Another catogery of multi class approach modify the binary class objective function and allows simultaneous computation of multiclass classification by solving a single optimisation problem. Results from this study conclude the usefulness of One vs. One multi class approach in term of accuracy and computational cost over other multi class approaches.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 03:47:45 GMT" } ]
"2008-02-19T00:00:00"
[ [ "Pal", "Mahesh", "" ] ]
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802.2412
Yasuhiro Shimizu
Mihoko M. Nojiri, Yasuhiro Shimizu, Shogo Okada, Kiyotomo Kawagoe
Inclusive transverse mass analysis for squark and gluino mass determination
21 pages, 18 figures
JHEP0806:035,2008
10.1088/1126-6708/2008/06/035
IPMU 08-0006, KEK-TH-1229
hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We propose an inclusive analysis of a stransverse mass (m_{T2}) using a hemisphere method for supersymmetry studies at the LHC . The hemisphere method is an algorithm to group collinear and high p_T particles and jets, assuming that there are two of such groups in a event. The m_{T2} is defined as a function of the unknown LSP mass, two hemisphere momenta, and missing transverse momentum. The kinematical end point of the m_{T2} distribution provides information on the squark and gluino masses. We perform a Monte Carlo simulation to study the inclusive m_{T2} distribution at the LHC. We show that the end point of the inclusive m_{T2} distribution has a cusp-like structure around the true LSP mass. The knowledge of the expected kinematical behavior near the end point for true events is important to establish the end point of the inclusive distribution. We find that the inclusive analysis is useful to obtain the information on the heaviest of the squark/gluino.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 04:03:01 GMT" } ]
"2008-11-26T00:00:00"
[ [ "Nojiri", "Mihoko M.", "" ], [ "Shimizu", "Yasuhiro", "" ], [ "Okada", "Shogo", "" ], [ "Kawagoe", "Kiyotomo", "" ] ]
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802.2413
Masanari Asano
Tatsuro Yamamoto, Masanari Asano, Yoshio Togawa and Masanori Ohya
On the Scarf-Hirota model in the price-scaled price adjustment process
null
null
null
null
math.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Hirota's results given in (Hirota.M.,1981) on the asymptotically stability are generalized to the price-scaled price adjustment process.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 04:10:12 GMT" } ]
"2008-02-19T00:00:00"
[ [ "Yamamoto", "Tatsuro", "" ], [ "Asano", "Masanari", "" ], [ "Togawa", "Yoshio", "" ], [ "Ohya", "Masanori", "" ] ]
[ -0.0371014252, -0.039095562, 0.0375999622, 0.0450779721, -0.0003273679, -0.0420867652, -0.0918876901, 0.02705203, -0.0900509879, -0.1303535253, 0.0034077424, -0.0186556671, -0.0772465318, -0.0610310584, -0.006021766, 0.0384395979, 0.0704244897, 0.0361830741, 0.0317225084, 0.0009265517, 0.0126404613, -0.0372850969, 0.0190230086, 0.058197286, -0.0186556671, -0.0122927995, 0.0317225084, 0.0661738291, 0.088686578, -0.0244412869, 0.043188788, -0.0828616023, -0.0636024475, -0.1111468449, -0.0573576503, 0.0354221538, -0.0202824622, 0.1273098439, -0.0263829455, 0.0135784922, 0.0633925349, -0.0172781404, -0.0785059854, 0.1145053953, 0.0674332827, 0.0216337517, 0.0494073443, -0.1179688945, -0.0043851314, 0.0602439009, -0.0110989418, -0.0325096659, -0.0353172012, -0.1907023787, -0.0445531979, -0.0493548661, 0.109782435, 0.043870993, 0.0952987149, -0.035737019, 0.0299907569, -0.1554376632, -0.070896782, -0.0616083108, -0.0469933897, -0.0003365925, -0.111041896, 0.0236278884, -0.0842784867, 0.0759870782, -0.0816546232, -0.0713690817, 0.1184936613, -0.0026845401, 0.046835959, -0.0944590792, -0.0509816632, 0.0990770757, 0.1370706111, 0.1435777992, 0.0064875018, 0.0572526976, -0.0790307596, -0.0444482453, 0.0335329734, -0.0195346624, 0.0076748002, 0.0016776326, -0.1275197566, -0.0782960802, -0.0511915721, 0.1400093436, -0.0165565778, 0.0410896987, 0.0124043133, -0.0870073065, -0.0079175076, -0.0200856738, 0.0310403015, -0.1374904364, 0.0332181081, -0.0525297411, 0.0910480544, 0.0053658006, 0.0432412662, 0.0087571433, -0.0462062322, -0.0396465734, -0.1307733506, 0.0739404634, 0.0048541469, -0.0029387269, -0.0754098296, 0.0533431396, -0.0529495589, -0.028862495, -0.0780336931, 0.063917309, -0.0590369217, 0.0565180145, -0.0227226559, -0.0512702875, 0.0120107336, -0.0273406543, -0.0060316059, 0.0818645358, -0.0459963232, -0.0265797339, -0.0438972339, -0.0785059854, 0.0810249001, -0.0937243924, -0.0951937586, 0.0592993088, -0.0612409674, 0.0319061764, -0.0269995537, 0.0311977342, 0.1327674836, -0.013079958, 0.0628152862, 0.0163073093, -0.0922025517, -0.0400663912, -0.0950363278, 0.0978176221, 0.0129881231, 0.0983948708, -0.0533956178, 0.0606637187, -0.0061726384, -0.0128241321, 0.0346874706, 0.0510866158, -0.0512178093, -0.070896782, -0.0244019274, -0.0809199437, 0.0015365999, 0.0436348468, -0.0141032645, 0.0797129646, -0.0290199276, 0.0375212431, 0.0816546232, 0.0446581542, -0.1054793, 0.0029042887, -0.1284643412, -0.1095725298, -0.048436515, -0.0447893441, -0.0107184816, -0.0822843537, 0.0673808083, 0.0017022312, -0.0948788971, -0.0397777669, 0.0206104461, 0.0448943004, -0.0018727824, 0.038911894, -0.1022781879, -0.0772465318, 0.0199151225, -0.1063714176, -0.0503519364, 0.0663837418, 0.043687325, -0.0058676144, 0.0378623456, 0.0480166972, 0.0848557353, 0.0618706942, -0.0426902547, -0.0265666153, 0.0201906282, 0.0407485962, 0.0338215977, 0.0836487636, 0.1056367382, -0.0763019472, 0.0802902132, 0.0060840831, -0.0441333801, 0.0313289277, -0.065281719, 0.0684303567, 0.0043654526, 0.0304105747, 0.0502207428, -0.0216599908, -0.0065760571, 0.0899460316, -0.0967680737, 0.0380722545, -0.0588270128, 0.0320111327, 0.0087899417, 0.0496434942, -0.065911442, 0.0739929453, 0.0258188136, 0.0139589524, -0.0062743132, 0.0637598783, 0.0603488535, 0.0098722856, 0.0432150289, -0.0309878252, 0.0152446451, 0.0612934455, 0.0005821697, 0.0732582659, -0.0087243449, 0.0161629971, -0.0054871542, -0.106161505, -0.0245331209, -0.0836487636, -0.0789258033, 0.0488563329, 0.0736780837, -0.0274980869, -0.0262386333, 0.0714215562, 0.0380984955, -0.0258188136, 0.0334804952, 0.013644089, -0.025569547, 0.0806050822, -0.0240608267, 0.0016079362, -0.0565704927, -0.0443957672 ]
802.2414
Minhsiu Hsieh
Isaac Kremsky, Min-Hsiu Hsieh, and Todd A. Brun
Classical Enhancement of Quantum Error-Correcting Codes
8 pages, submitted to PRA
Phys. Rev. A 78, 012341 (2008)
10.1103/PhysRevA.78.012341
null
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a general formalism for quantum error-correcting codes that encode both classical and quantum information (the EACQ formalism). This formalism unifies the entanglement-assisted formalism and classical error correction, and includes encoding, error correction, and decoding steps such that the encoded quantum and classical information can be correctly recovered by the receiver. We formally define this kind of quantum code using both stabilizer and symplectic language, and derive the appropriate error-correcting conditions. We give several examples to demonstrate the construction of such codes.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 04:12:18 GMT" } ]
"2010-02-20T00:00:00"
[ [ "Kremsky", "Isaac", "" ], [ "Hsieh", "Min-Hsiu", "" ], [ "Brun", "Todd A.", "" ] ]
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802.2415
Leonid Kitchatinov
L. L. Kitchatinov, G. R\"udiger
Diamagnetic pumping near the base of a stellar convection zone
4 pages, 5 figures
null
10.1002/asna.200810971
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The property of inhomogeneous turbulence in conducting fluids to expel large-scale magnetic fields in the direction of decreasing turbulence intensity is shown as important for the magnetic field dynamics near the base of a stellar convection zone. The downward diamagnetic pumping confines a fossil internal magnetic field in the radiative core so that the field geometry is appropriate for formation of the solar tachocline. For the stars of solar age, the diamagnetic confinement is efficient only if the ratio of turbulent magnetic diffusivity of the convection zone to the (microscopic or turbulent) diffusivity of the radiative interiour is larger than 10^5. Confinement in younger stars require still larger diffusivity ratio. The observation of persistent magnetic structures on young solar-type stars can thus provide evidences for the nonexistence of tachoclines in stellar interiors and on the level of turbulence in radiative cores.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 05:15:06 GMT" } ]
"2009-11-13T00:00:00"
[ [ "Kitchatinov", "L. L.", "" ], [ "Rüdiger", "G.", "" ] ]
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802.2416
Pengjie Zhang
Pengjie Zhang (SHAO)
Self calibration of galaxy bias in spectroscopic redshift surveys of baryon acoustic oscillations
7 pages, 3 figures. Submitted to ApJ
null
null
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Baryon acoustic oscillation (BAO) is a powerful probe on the expansion of the universe, shedding light on elusive dark energy and gravity at cosmological scales. BAO measurements through biased tracers of the underlying matter density field, as most proposals do, can reach high statistical accuracy. However, possible scale dependence in bias may induce non-negligible systematical errors, especially for the most ambitious spectroscopic surveys proposed. We show that precision spectroscopic redshift information available in these surveys allows for {\it self calibration} of the galaxy bias and its stochasticity, as function of scale and redshift. Through the effect of redshift distortion, one can simultaneously measure the real space power spectra of galaxies, galaxy-velocity and velocity, respectively. At relevant scales of BAO, galaxy velocity faithfully traces that of the underlying matter. This valuable feature enables a rather model independent way to measure the galaxy bias and its stochasticity by comparing the three power spectra. For the square kilometer array (SKA), this self calibration is statistically accurate to correct for 1% level shift in BAO peak positions induced by bias scale dependence. Furthermore, we find that SKA is able to detect BAO in the velocity power spectrum, opening a new window for BAO cosmology.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 05:32:09 GMT" } ]
"2008-02-19T00:00:00"
[ [ "Zhang", "Pengjie", "", "SHAO" ] ]
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802.2417
Pengjie Zhang
Pengjie Zhang (SHAO)
Dimming of supernovae and gamma ray busts by Compton Scattering and its cosmological implications
3 pages, 3 figures. Minor revisions. Accepted to ApJ
Astrophys.J.682:721-723,2008
10.1086/589736
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Free electrons deplete photons from type Ia supernovae through the (inverse) Compton scattering. This Compton dimming increases with redshift and reaches 0.004 mag at $z=1$ and 0.01 mag at $z=2$. Although far from sufficient to invalidate the existence of dark energy, it can bias constraint on dark energy at a level non-negligible for future supernova surveys. This effect is correctable and should be incorporated in supernova analysis. The Compton dimming has similar impact on cosmology based on gamma ray bursts as standard candles.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 05:26:38 GMT" }, { "version": "v2", "created": "Thu, 10 Apr 2008 01:38:52 GMT" } ]
"2009-06-23T00:00:00"
[ [ "Zhang", "Pengjie", "", "SHAO" ] ]
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802.2418
Jacob Scott
Christopher Crutchfield, Zoran Dzunic, Jeremy T. Fineman, David R. Karger, and Jacob Scott
Improved Approximations for Multiprocessor Scheduling Under Uncertainty
null
null
null
null
cs.DC cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper presents improved approximation algorithms for the problem of multiprocessor scheduling under uncertainty, or SUU, in which the execution of each job may fail probabilistically. This problem is motivated by the increasing use of distributed computing to handle large, computationally intensive tasks. In the SUU problem we are given n unit-length jobs and m machines, a directed acyclic graph G of precedence constraints among jobs, and unrelated failure probabilities q_{ij} for each job j when executed on machine i for a single timestep. Our goal is to find a schedule that minimizes the expected makespan, which is the expected time at which all jobs complete. Lin and Rajaraman gave the first approximations for this NP-hard problem for the special cases of independent jobs, precedence constraints forming disjoint chains, and precedence constraints forming trees. In this paper, we present asymptotically better approximation algorithms. In particular, we give an O(loglog min(m,n))-approximation for independent jobs (improving on the previously best O(log n)-approximation). We also give an O(log(n+m) loglog min(m,n))-approximation algorithm for precedence constraints that form disjoint chains (improving on the previously best O(log(n)log(m)log(n+m)/loglog(n+m))-approximation by a (log n/loglog n)^2 factor when n = poly(m). Our algorithm for precedence constraints forming chains can also be used as a component for precedence constraints forming trees, yielding a similar improvement over the previously best algorithms for trees.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 20:57:17 GMT" }, { "version": "v2", "created": "Tue, 19 Feb 2008 02:58:36 GMT" } ]
"2008-02-19T00:00:00"
[ [ "Crutchfield", "Christopher", "" ], [ "Dzunic", "Zoran", "" ], [ "Fineman", "Jeremy T.", "" ], [ "Karger", "David R.", "" ], [ "Scott", "Jacob", "" ] ]
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802.2419
Shun Watanabe
Shun Watanabe, Ryutaroh Matsumoto, Tomohiko Uyematsu
Tomography increases key rates of quantum-key-distribution protocols
13 pages, 1 figure, REVTeX4. To be published in PRA. Version 2 adds many references, a closed form key rate formula for unital channels, and a procedure for the maximum likelihood channel estimation
Phys. Rev. A 78, 042316 (2008)
10.1103/PhysRevA.78.042316
null
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We construct a practically implementable classical processing for the BB84 protocol and the six-state protocol that fully utilizes the accurate channel estimation method, which is also known as the quantum tomography. Our proposed processing yields at least as high key rate as the standard processing by Shor and Preskill. We show two examples of quantum channels over which the key rate of our proposed processing is strictly higher than the standard processing. In the second example, the BB84 protocol with our proposed processing yields a positive key rate even though the so-called error rate is higher than the 25% limit.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 06:26:38 GMT" }, { "version": "v2", "created": "Tue, 22 Jul 2008 09:57:59 GMT" } ]
"2008-10-19T00:00:00"
[ [ "Watanabe", "Shun", "" ], [ "Matsumoto", "Ryutaroh", "" ], [ "Uyematsu", "Tomohiko", "" ] ]
[ 0.0365692452, 0.0196038596, 0.0078956326, 0.0714498684, 0.0492339209, 0.0175062735, -0.0392341055, 0.1101826653, -0.1239027306, -0.0721886382, 0.1109214351, 0.0776238963, -0.0661201552, 0.0621624403, 0.0496033058, -0.1159873083, 0.0349597782, 0.0234824158, 0.0043106065, -0.0311076064, -0.039893724, -0.0712915584, 0.05936566, 0.004191875, 0.0300786011, -0.0522153974, -0.0202107094, -0.0792069808, 0.0625318289, -0.07419388, -0.0224666037, -0.0946156681, -0.0077900938, -0.0671227723, -0.0765157416, 0.0300522167, -0.0861725509, 0.0474397577, -0.0485743023, -0.0091818888, 0.0141949886, -0.0001157424, -0.0793125182, 0.0440888964, -0.0446957462, 0.0222555269, -0.0206724424, -0.0493658446, -0.1017923206, 0.0028726384, 0.0457247496, 0.1249581203, -0.0984678417, -0.045909442, -0.0436931252, -0.0556717962, 0.0060816822, -0.0091686966, 0.0254744645, 0.0615819767, 0.0379148684, -0.1235861108, 0.035487473, -0.014683106, -0.0246433448, -0.0781515911, -0.0569910333, 0.0169521943, -0.0315297619, 0.0009960239, -0.0862780884, 0.018165892, 0.0414768085, 0.0097227758, 0.0800512955, -0.0053593996, -0.1028477103, 0.0858559385, 0.1323458403, 0.0392077193, -0.0127965976, -0.0043732701, 0.0476244502, -0.0060421047, -0.0055243042, 0.0082452307, -0.0287329797, -0.0012895541, -0.0375718661, 0.0163453445, 0.0444055125, 0.032690689, -0.0015608221, -0.0038158926, 0.039339643, -0.0023020683, 0.0378093272, 0.1224251837, 0.0451970547, -0.001467651, -0.0024537805, 0.0213716365, -0.0260945056, -0.0258438513, 0.1845876276, -0.0074141114, -0.0289176721, 0.0641676784, -0.0792069808, 0.0677560046, 0.0267673153, -0.1251691878, -0.1247470379, -0.0135485623, -0.0252106171, -0.1117657498, 0.061370898, -0.0124733848, -0.0028017294, 0.0683892369, -0.0705000162, -0.0100262007, -0.0051648123, 0.041582346, 0.0474133715, -0.057888113, 0.0624262877, -0.1990464628, -0.0251842327, 0.0145247979, 0.121580869, -0.0271762796, 0.0789431334, -0.0239045713, 0.0842200816, 0.0301841404, 0.0378884822, -0.0436931252, -0.0293925982, -0.0168994237, 0.0589962713, -0.0315825306, 0.0816343799, -0.018865088, -0.0465690605, 0.0890221074, -0.0778349787, -0.007651574, -0.0292870589, -0.0544053279, -0.1046946421, -0.0860670134, -0.0686530843, -0.0494186133, 0.0518987775, -0.0387591794, 0.0484951474, 0.1279132068, -0.0039972877, -0.0956710577, 0.08875826, 0.031767223, -0.0506323129, 0.0209230967, 0.0453289784, -0.0098085264, -0.0136936791, 0.0729801804, -0.1320292205, -0.0912384242, -0.0350125469, -0.0294453669, 0.0420045033, 0.0432181992, 0.0388383344, 0.1005258486, -0.0286538247, -0.1397335678, -0.031846378, -0.0804734528, -0.0263715442, 0.0337724648, 0.0306590647, 0.0311603751, -0.0045612613, -0.0004190638, -0.0472286791, 0.087333478, 0.0272818189, -0.0058804983, -0.0107979542, 0.0871224031, 0.0136672938, 0.0588907339, 0.0461205207, -0.0498671532, 0.0133374846, 0.0335086174, -0.0644315258, -0.0984678417, -0.0723997205, -0.0384425633, 0.0404478014, -0.0000901822, 0.0193400122, -0.0515821613, 0.1515539289, -0.0820565373, -0.1586250365, -0.0286802091, 0.0028841817, 0.0568327233, 0.1293907464, 0.0246433448, -0.0308173727, 0.0345376208, -0.0767268166, 0.0709221736, -0.0351180844, 0.0468856767, -0.0520834737, -0.0345376208, -0.0648536831, 0.0721358731, -0.0536929406, 0.1308683008, 0.0082386341, 0.0821093023, -0.0396034904, -0.1190479323, 0.0558301061, -0.0069919555, 0.0348014683, -0.0192740504, -0.0633761361, -0.0017562341, 0.0673338473, -0.1078608036, -0.0265298542, -0.1488099247, 0.0206328649, 0.0285746716, 0.0784154385, -0.022954721, -0.0884944126, 0.0227568354, -0.0631122887, -0.0448276699, 0.0273082033, 0.0464899093, 0.0052670534, -0.0183373932, -0.043745894, -0.1230584159, -0.0082782116, 0.0366747864 ]
802.242
Hitoshi Seo
Hitoshi Seo, Shoji Ishibashi, Yoshinori Okano, Hayao Kobayashi, Akiko Kobayashi, Hidetoshi Fukuyama, and Kiyoyuki Terakura
Single-Component Molecular Metals as Multiband \pi-d Systems
5 pages, 4 figures; for full color figures, see J. Phys. Soc. Jpn. published version
J. Phys. Soc. Jpn. Vol. 77 No. 2, February, 2008, 023714 (4 pages)
10.1143/JPSJ.77.023714
null
cond-mat.str-el cond-mat.mtrl-sci
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Electronic states of single-component molecular metals M(tmdt)2 (M = Ni, Au) are studied theoretically. We construct an effective three-band Hubbard model for each material by numerical fitting to first-principles band calculations, while referring to molecular orbital calculations for the isolated molecules. The model consists of two kinds of base orbital for each molecule with hybridization between them, i.e., a \pi-character orbital for each of the two tmdt ligands, and, a pd\pi-orbital for M = Ni or a pd\sigma-orbital for M = Au centered on the metal site; this indicates that these materials can be considered as novel multiband \pi-d systems. We find that both orbitals contribute to realize the metallic character in Ni(tmdt)2. The origin of the antiferromagnetic transition observed in Au(tmdt)2 is also discussed based on this model.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 06:23:36 GMT" } ]
"2008-02-19T00:00:00"
[ [ "Seo", "Hitoshi", "" ], [ "Ishibashi", "Shoji", "" ], [ "Okano", "Yoshinori", "" ], [ "Kobayashi", "Hayao", "" ], [ "Kobayashi", "Akiko", "" ], [ "Fukuyama", "Hidetoshi", "" ], [ "Terakura", "Kiyoyuki", "" ] ]
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802.2421
Juergen Horbach
Antoine Carre (University of Mainz, Germany), Juergen Horbach (German Aerospace Center, Koeln, Germany), Simona Ispas, Walter Kob (University of Montpellier II, France)
New fitting scheme to obtain effective potential from Car-Parrinello molecular dynamics simulations: Application to silica
6 pages, 5 figures
null
10.1209/0295-5075/82/17001
null
cond-mat.dis-nn cond-mat.mtrl-sci
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A fitting scheme is proposed to obtain effective potentials from Car-Parrinello molecular dynamics (CPMD) simulations. It is used to parameterize a new pair potential for silica. MD simulations with this new potential are done to determine structural and dynamic properties and to compare these properties to those obtained from CPMD and a MD simulation using the so-called BKS potential. The new potential reproduces accurately the liquid structure generated by the CPMD trajectories, the experimental activation energies for the self-diffusion constants and the experimental density of amorphous silica. Also lattice parameters and elastic constants of alpha-quartz are well-reproduced, showing the transferability of the new potential.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 18:54:33 GMT" } ]
"2009-11-13T00:00:00"
[ [ "Carre", "Antoine", "", "University of Mainz, Germany" ], [ "Horbach", "Juergen", "", "German\n Aerospace Center, Koeln, Germany" ], [ "Ispas", "Simona", "", "University of\n Montpellier II, France" ], [ "Kob", "Walter", "", "University of\n Montpellier II, France" ] ]
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802.2422
Nobusuke Takahashi
N.Takahashi, E.Konishi and A.Misaki
The numerical computer experiment for the neutrino events with the SK neutrino oscillation parameters occurring outside the Superkamiokande detector
21 pages, 31 figures
null
null
null
hep-ph hep-ex
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Adopting neutrino oscillation parameters obtained by Super-Kamiokande, a numerical computer experiment for neutrino events occurring outside the detector, is carried out in the same SK live days, 1645.9 live days, constructing the virtual Super-Kamiokande detector in the computer. The numerical results by the computer experiment could be directly compared with the real SK experimental data. The comparison shows that it is difficult to obtain convincing conclusion on the existence of the neutrino oscillation with specified neutrino oscillation parameters claimed by SK through analysis for neutrino events occurring outside the detector.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 06:47:13 GMT" } ]
"2008-02-19T00:00:00"
[ [ "Takahashi", "N.", "" ], [ "Konishi", "E.", "" ], [ "Misaki", "A.", "" ] ]
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802.2423
Ying Liu
Y. Liu, J. G. Luhmann, R. M\"uller-Mellin, P. C. Schroeder, L. Wang, R. P. Lin, S. D. Bale, Y. Li, M. H. Acu\~na, and J.-A. Sauvaud
A Comprehensive View of the 2006 December 13 CME: From the Sun to Interplanetary Space
26 pages, 10 figures. 2008, ApJ, in press
null
10.1086/592031
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The biggest halo coronal mass ejection (CME) since the Halloween storm in 2003, which occurred on 2006 December 13, is studied in terms of its solar source and heliospheric consequences. The CME is accompanied by an X3.4 flare, EUV dimmings and coronal waves. It generated significant space weather effects such as an interplanetary shock, radio bursts, major solar energetic particle (SEP) events, and a magnetic cloud (MC) detected by a fleet of spacecraft including STEREO, ACE, Wind and Ulysses. Reconstruction of the MC with the Grad-Shafranov (GS) method yields an axis orientation oblique to the flare ribbons. Observations of the SEP intensities and anisotropies show that the particles can be trapped, deflected and reaccelerated by the large-scale transient structures. The CME-driven shock is observed at both the Earth and Ulysses when they are separated by 74$^{\circ}$ in latitude and 117$^{\circ}$ in longitude, the largest shock extent ever detected. The ejecta seems missed at Ulysses. The shock arrival time at Ulysses is well predicted by an MHD model which can propagate the 1 AU data outward. The CME/shock is tracked remarkably well from the Sun all the way to Ulysses by coronagraph images, type II frequency drift, in situ measurements and the MHD model. These results reveal a technique which combines MHD propagation of the solar wind and type II emissions to predict the shock arrival time at the Earth, a significant advance for space weather forecasting especially when in situ data are available from the Solar Orbiter and Sentinels.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 07:06:02 GMT" }, { "version": "v2", "created": "Thu, 21 Feb 2008 01:55:00 GMT" }, { "version": "v3", "created": "Fri, 18 Jul 2008 00:31:18 GMT" } ]
"2009-11-13T00:00:00"
[ [ "Liu", "Y.", "" ], [ "Luhmann", "J. G.", "" ], [ "Müller-Mellin", "R.", "" ], [ "Schroeder", "P. C.", "" ], [ "Wang", "L.", "" ], [ "Lin", "R. P.", "" ], [ "Bale", "S. D.", "" ], [ "Li", "Y.", "" ], [ "Acuña", "M. H.", "" ], [ "Sauvaud", "J. -A.", "" ] ]
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802.2424
Erwan Le Pennec
Florent Autin (MODAL'X), Erwan Le Pennec (PMA), Karine Tribouley (MODAL'X, PMA)
Thresholding methods to estimate the copula density
null
Journal of Multivariate Analysis 101, 1 (2010) 200-222
10.1016/j.jmva.2009.07.009
null
math.ST stat.TH
null
This paper deals with the problem of the multivariate copula density estimation. Using wavelet methods we provide two shrinkage procedures based on thresholding rules for which the knowledge of the regularity of the copula density to be estimated is not necessary. These methods, said to be adaptive, are proved to perform very well when adopting the minimax and the maxiset approaches. Moreover we show that these procedures can be discriminated in the maxiset sense. We produce an estimation algorithm whose qualities are evaluated thanks some simulation. Last, we propose a real life application for financial data.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 07:15:12 GMT" } ]
"2011-11-04T00:00:00"
[ [ "Autin", "Florent", "", "MODAL'X" ], [ "Pennec", "Erwan Le", "", "PMA" ], [ "Tribouley", "Karine", "", "MODAL'X, PMA" ] ]
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802.2425
Yoshihiro Kuge
Yoshihiro Kuge, Isao Maruyama and Yasuhiro Hatsugai
Topological Aspects of Surface States in Semiconductors
10 pages, 9 figures; two-column
null
null
null
cond-mat.str-el cond-mat.mes-hall
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Topological aspects of surface states in semiconductors are studied by an adiabatic deformation which connects a realistic system and a decoupled covalent-bond model. Two topological invariants are focused. One is a quantized Berry phase, and the other is a number of the edge states. A winding number as another topological invariant is also considered. The surface states of Si and Ge at (111), (110), and (100) surfaces are classified by the topological invariants. Surface states of the GaAs as heterosemiconductors are also discussed.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 07:18:25 GMT" }, { "version": "v2", "created": "Tue, 19 Feb 2008 07:32:24 GMT" } ]
"2008-02-19T00:00:00"
[ [ "Kuge", "Yoshihiro", "" ], [ "Maruyama", "Isao", "" ], [ "Hatsugai", "Yasuhiro", "" ] ]
[ 0.0085891271, 0.0059505315, -0.0144462278, 0.0977858901, 0.0073390962, -0.0215598028, -0.0897444561, -0.0482228249, 0.070310995, -0.0444856212, 0.1066005379, -0.0231448933, -0.0928373113, 0.044408299, 0.0919094533, -0.0340214483, -0.0967549309, 0.1267041117, 0.096239455, 0.0488929451, 0.0533518158, -0.0297687668, 0.0645376518, 0.0521404445, 0.0368823409, 0.011089188, 0.0829917118, 0.0094461069, 0.140003413, 0.0185958147, 0.0920125544, -0.0298203137, -0.0215984639, -0.0430680588, -0.0741255209, 0.0570632443, 0.0218304284, 0.0484032407, -0.0629396811, 0.0767029002, -0.0056605763, 0.1126831546, -0.041830916, 0.0142786987, 0.034975078, 0.0558261015, -0.0309285894, 0.0437124036, 0.0189179871, 0.0059763053, 0.0045812973, 0.0143689066, 0.1061881557, -0.0419340096, -0.0499238968, -0.0178483725, 0.0017429548, 0.0938682631, 0.0528878868, -0.0564446747, 0.0523466356, -0.1015488654, -0.0494599678, 0.0306450762, -0.1267041117, -0.0436093099, -0.064022176, -0.006984706, -0.06943468, 0.024974836, -0.0115724467, 0.0167787597, 0.0775792077, 0.0288924556, 0.0025193912, -0.018376736, -0.050078541, 0.0412638932, -0.0231706668, 0.0605684854, 0.0365988314, 0.0217402205, 0.035902936, -0.0401556157, -0.0782493278, -0.0134281619, 0.0105221635, -0.0507486574, -0.1869117767, -0.0282738842, 0.0385576412, 0.016765872, -0.0330420434, 0.0830432624, -0.0444598459, -0.0233897455, 0.03768133, -0.0550528876, -0.0565993153, -0.1014973149, 0.0048583657, -0.0730430186, -0.0552075319, 0.0623726547, 0.1645400971, 0.0001452798, -0.0027932383, -0.0230160244, -0.0961879119, -0.0085375793, 0.0743832588, -0.019600993, -0.034846209, 0.0735584944, 0.0047520488, -0.0054769376, -0.0063145868, -0.1003117189, -0.0166885518, 0.0852082595, -0.0333255529, 0.0626819432, 0.0088275345, -0.0041560293, 0.0067849592, -0.0121201407, 0.0361091271, -0.1153636351, -0.0692800358, -0.0343565084, 0.0861361176, -0.0790225416, -0.0841773078, -0.0290213265, 0.0413669869, -0.0802081376, 0.0343049578, 0.0321915075, 0.1018581539, 0.0136472397, -0.0302842427, -0.0218690895, 0.1003117189, -0.0183638502, 0.1312403083, 0.018415397, 0.0158122405, 0.1556738913, 0.0011702927, 0.0078159124, 0.0342276394, -0.0433257967, -0.0085311355, 0.0564962216, 0.0504651479, -0.1359826922, 0.1251576841, 0.0560322925, -0.0103546334, -0.0217917673, 0.0132606328, 0.0150776869, 0.0436350852, 0.0311863273, 0.0391504392, -0.0264697168, -0.07866171, 0.0553621724, 0.0121588018, -0.0540734828, -0.0329131745, -0.1625812799, -0.0661871806, -0.0568570569, 0.0238407869, 0.0060085226, -0.0338410325, -0.0781462342, -0.0601561032, 0.0251165908, 0.0580426529, -0.1153636351, -0.1116522029, -0.0535580069, -0.1313434094, -0.0272944793, 0.0592797957, 0.0332997814, -0.0482743718, -0.0165467951, -0.1266010255, 0.0425525829, 0.1150543466, 0.0798988566, -0.0439701453, -0.0898991004, 0.0394339487, 0.0394339487, 0.039201986, -0.0266501345, 0.0280419197, -0.083404094, 0.0480424091, 0.0093236808, -0.1355703175, -0.0195881054, 0.1011880338, -0.0067785159, -0.0555168167, -0.0876310021, 0.0066883075, 0.0828886181, -0.0214953683, 0.0776307583, -0.0563931279, 0.0437124036, -0.0586096756, -0.0019539781, 0.0547951497, 0.1090748236, -0.039923653, 0.0574240796, 0.0052771904, 0.0931465998, 0.0650015846, 0.1686639041, 0.005840993, -0.0251423661, 0.0038821823, 0.0056573544, -0.0045587453, 0.009104603, 0.0157220326, -0.0144977756, -0.0934558883, -0.0014328635, 0.0809298083, -0.0014417233, -0.052578602, -0.0337637104, -0.1228895932, 0.0074228612, -0.0424752608, 0.0853629038, 0.1186626852, 0.0417535938, -0.0201809034, 0.0012596956, -0.0378875211, 0.0023148116, -0.0807236135, 0.0608262233, -0.0437639542, 0.0034053666, 0.0007240833, -0.083146356 ]
802.2426
Bertrand Iooss
Claire Cannamela, Josselin Garnier, Bertrand Iooss
Controlled stratification for quantile estimation
Published in at http://dx.doi.org/10.1214/08-AOAS186 the Annals of Applied Statistics (http://www.imstat.org/aoas/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Annals of Applied Statistics 2008, Vol. 2, No. 4, 1554-1580
10.1214/08-AOAS186
IMS-AOAS-AOAS186
stat.ME math.ST stat.AP stat.TH
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper we propose and discuss variance reduction techniques for the estimation of quantiles of the output of a complex model with random input parameters. These techniques are based on the use of a reduced model, such as a metamodel or a response surface. The reduced model can be used as a control variate; or a rejection method can be implemented to sample the realizations of the input parameters in prescribed relevant strata; or the reduced model can be used to determine a good biased distribution of the input parameters for the implementation of an importance sampling strategy. The different strategies are analyzed and the asymptotic variances are computed, which shows the benefit of an adaptive controlled stratification method. This method is finally applied to a real example (computation of the peak cladding temperature during a large-break loss of coolant accident in a nuclear reactor).
[ { "version": "v1", "created": "Mon, 18 Feb 2008 07:19:52 GMT" }, { "version": "v2", "created": "Tue, 27 Jan 2009 12:56:56 GMT" } ]
"2009-01-27T00:00:00"
[ [ "Cannamela", "Claire", "" ], [ "Garnier", "Josselin", "" ], [ "Iooss", "Bertrand", "" ] ]
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802.2427
Herve Courtois
Sukumar Rajauria (NEEL), Philippe Gandit (NEEL), Thierry Fournier (NEEL), F. W. J. Hekking (PMMC), Bernard Pannetier (NEEL), Herv\'e Courtois (NEEL)
Andreev Current-Induced Dissipation in a Hybrid Superconducting Tunnel Junction
null
Physical Review Letters 100 (2008) 207002
10.1103/PhysRevLett.100.207002
null
cond-mat.supr-con
null
We have studied hybrid superconducting micro-coolers made of a double Superconductor-Insulator-Normal metal tunnel junction. Under subgap conditions, the Andreev current is found to dominate the single-particle tunnel current. We show that the Andreev current introduces additional dissipation in the normal metal equivalent to Joule heating. By analyzing quantitatively the heat balance in the system, we provide a full description of the evolution of the electronic temperature with the voltage. The dissipation induced by the Andreev current is found to dominate the quasiparticle tunneling-based cooling over a large bias range.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 07:25:21 GMT" }, { "version": "v2", "created": "Tue, 3 Jun 2008 08:26:59 GMT" } ]
"2009-11-13T00:00:00"
[ [ "Rajauria", "Sukumar", "", "NEEL" ], [ "Gandit", "Philippe", "", "NEEL" ], [ "Fournier", "Thierry", "", "NEEL" ], [ "Hekking", "F. W. J.", "", "PMMC" ], [ "Pannetier", "Bernard", "", "NEEL" ], [ "Courtois", "Hervé", "", "NEEL" ] ]
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802.2428
Alexandre Benoit
Oya Aran, Ismail Ari, Alexandre Benoit (GIPSA-lab), Ana Huerta Carrillo, Fran\c{c}ois-Xavier Fanard (TELE), Pavel Campr, Lale Akarun, Alice Caplier (GIPSA-lab), Michele Rombaut (GIPSA-lab), Bulent Sankur
Sign Language Tutoring Tool
eNTERFACE'06. Summer Workshop. on Multimodal Interfaces, Dubrovnik : Croatie (2007)
null
null
null
cs.LG cs.HC
null
In this project, we have developed a sign language tutor that lets users learn isolated signs by watching recorded videos and by trying the same signs. The system records the user's video and analyses it. If the sign is recognized, both verbal and animated feedback is given to the user. The system is able to recognize complex signs that involve both hand gestures and head movements and expressions. Our performance tests yield a 99% recognition rate on signs involving only manual gestures and 85% recognition rate on signs that involve both manual and non manual components, such as head movement and facial expressions.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 07:28:44 GMT" } ]
"2008-09-11T00:00:00"
[ [ "Aran", "Oya", "", "GIPSA-lab" ], [ "Ari", "Ismail", "", "GIPSA-lab" ], [ "Benoit", "Alexandre", "", "GIPSA-lab" ], [ "Carrillo", "Ana Huerta", "", "TELE" ], [ "Fanard", "François-Xavier", "", "TELE" ], [ "Campr", "Pavel", "", "GIPSA-lab" ], [ "Akarun", "Lale", "", "GIPSA-lab" ], [ "Caplier", "Alice", "", "GIPSA-lab" ], [ "Rombaut", "Michele", "", "GIPSA-lab" ], [ "Sankur", "Bulent", "" ] ]
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802.2429
Sebastien Verel
David Simoncini (I3S), S\'ebastien Verel (I3S), Philippe Collard (I3S), Manuel Clergue (I3S)
Anisotropic selection in cellular genetic algorithms
null
Dans Proceedings of the 8th annual conference on Genetic and evolutionary computation - Genetic And Evolutionary Computation Conference, Seatle : \'Etats-Unis d'Am\'erique (2006)
10.1145/1143997.1144098
null
cs.AI
null
In this paper we introduce a new selection scheme in cellular genetic algorithms (cGAs). Anisotropic Selection (AS) promotes diversity and allows accurate control of the selective pressure. First we compare this new scheme with the classical rectangular grid shapes solution according to the selective pressure: we can obtain the same takeover time with the two techniques although the spreading of the best individual is different. We then give experimental results that show to what extent AS promotes the emergence of niches that support low coupling and high cohesion. Finally, using a cGA with anisotropic selection on a Quadratic Assignment Problem we show the existence of an anisotropic optimal value for which the best average performance is observed. Further work will focus on the selective pressure self-adjustment ability provided by this new selection scheme.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 07:30:04 GMT" } ]
"2008-02-19T00:00:00"
[ [ "Simoncini", "David", "", "I3S" ], [ "Verel", "Sébastien", "", "I3S" ], [ "Collard", "Philippe", "", "I3S" ], [ "Clergue", "Manuel", "", "I3S" ] ]
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802.243
Phil Yoon PhD
Phil S. Yoon, David E. Johnson, and Weiren Chou
The Modeling of Time-Structured Multiturn Injection into Fermilab Main Injector (Microbunch Injection with Parasitic Longitudinal Painting)
42 pages, 35 figures
null
null
Fermilab-TM-2398-AD-APC
physics.acc-ph physics.comp-ph
http://creativecommons.org/licenses/publicdomain/
This paper presents the modeling of time-structured multiturn injection for an upgraded Main Injector with the 8-GeV Superconducting RF proton driver, or an ILC-style linac, or a Project-X linac. The Radio-Frequency mismatch between a linac and the upgraded Main Injector will induce parasitic longitudinal painting in RF-phase direction. Several different scenarios with a choice of different RF parameters for single RF system and double RF system in the presence of longitudinal space charge have been investigated. From the studies of microbunch injection with the aid of ESME (2003) numerical simulations, it is found that the dual RF system with a choice of appropriate RF parameters allows us to overcome the space-charge limitation set by beam intensity during the multiturn-injection process. A double RF system with a harmonic ratio (R_H = H_2/H_1) of 2.0 and a voltage ratio (R_V = V_2/V_1) of 0.5 are most favored to reduce both longitudinal and transverse effects of space charge in the Main Injector.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 07:39:38 GMT" }, { "version": "v2", "created": "Sun, 5 Aug 2012 08:57:41 GMT" } ]
"2012-08-07T00:00:00"
[ [ "Yoon", "Phil S.", "" ], [ "Johnson", "David E.", "" ], [ "Chou", "Weiren", "" ] ]
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802.2431
Zurab Silagadze
O.I. Chashchina, Z.K. Silagadze
Remark on orbital precession due to central-force perturbations
3 pages, ReVTeX4, title changed to match the version to be published in Phys. Rev. D, one new reference added, minor corrections in the text
Phys.Rev.D77:107502,2008
10.1103/PhysRevD.77.107502
null
gr-qc
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This is a comment on the recent paper by G. S. Adkins and J. McDonnell ``Orbital precession due to central-force perturbations'' published in Phys. Rev. D75 (2007), 082001 [arXiv:gr-qc/0702015]. We show that the main result of this paper, the formula for the precession of Keplerian orbits induced by central-force perturbations, can be obtained very simply by the use of Hamilton's vector.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 10:19:22 GMT" }, { "version": "v2", "created": "Mon, 31 Mar 2008 04:58:32 GMT" } ]
"2008-11-26T00:00:00"
[ [ "Chashchina", "O. I.", "" ], [ "Silagadze", "Z. K.", "" ] ]
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802.2432
Andrei Romashchenko
Bruno Durand (LIF), Andrei Romashchenko (LIP), Alexander Shen (LIF)
Fixed Point and Aperiodic Tilings
v5: technical revision (positions of figures are shifted)
12th International Conference on Developments in Language Theory, Kyoto : Japan (2008)
10.1007/978-3-540-85780-8_22
null
cs.CC cs.DM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
An aperiodic tile set was first constructed by R.Berger while proving the undecidability of the domino problem. It turned out that aperiodic tile sets appear in many topics ranging from logic (the Entscheidungsproblem) to physics (quasicrystals) We present a new construction of an aperiodic tile set that is based on Kleene's fixed-point construction instead of geometric arguments. This construction is similar to J. von Neumann self-reproducing automata; similar ideas were also used by P. Gacs in the context of error-correcting computations. The flexibility of this construction allows us to construct a "robust" aperiodic tile set that does not have periodic (or close to periodic) tilings even if we allow some (sparse enough) tiling errors. This property was not known for any of the existing aperiodic tile sets.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 07:50:13 GMT" }, { "version": "v2", "created": "Tue, 19 Feb 2008 15:43:21 GMT" }, { "version": "v3", "created": "Mon, 7 Jul 2008 11:16:24 GMT" }, { "version": "v4", "created": "Wed, 13 Jan 2010 13:50:04 GMT" }, { "version": "v5", "created": "Wed, 27 Jan 2010 14:15:07 GMT" } ]
"2010-01-27T00:00:00"
[ [ "Durand", "Bruno", "", "LIF" ], [ "Romashchenko", "Andrei", "", "LIP" ], [ "Shen", "Alexander", "", "LIF" ] ]
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802.2433
Agam Jha
R. Ramanathan, Agam k. Jha, K. k. Gupta and S. S. Singh (University of Delhi, Delhi)
Effect of finite chemical potential on QGP-Hadron phase transition in a statistical model of fireball formation
LaTex 20 pages, 20 figures
Indian J.Phys.85:885-889,2011
10.1007/s12648-011-0094-7
null
hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the effect of finite chemical potential for the QGP constituents in the Ramanathan et al. statistical model (Phys.Rev.C70, 027903,2004). While the earlier computations using this model with vanishing chemical potentials indicated a weakly first order phase transition for the system in the vicinity of 170 MeV (Pramana, 68, 757, 2007), the introduction of finite values for the chemical potentials of the constituents makes the transition a smooth roll over of the phases, while allowing fireball formation with radius of a few "fermi" to take place. This seems to be in conformity with the latest consensus on the nature of the QGP-Hadron phase transition. Keywords: Quark Gluon Plasma, Quark Hadron Phase Transition
[ { "version": "v1", "created": "Mon, 18 Feb 2008 07:54:18 GMT" } ]
"2011-07-26T00:00:00"
[ [ "Ramanathan", "R.", "", "University of\n Delhi, Delhi" ], [ "Jha", "Agam k.", "", "University of\n Delhi, Delhi" ], [ "Gupta", "K. k.", "", "University of\n Delhi, Delhi" ], [ "Singh", "S. S.", "", "University of\n Delhi, Delhi" ] ]
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802.2434
Mykola Shpot
M. A. Shpot, H. W. Diehl, and Yu. M. Pis'mak
Compatibility of 1/n and epsilon expansions for critical exponents at m-axial Lifshitz points
8 pages, submitted to J. Phys. A
J. Phys. A: Math. Theor. 41, 135003 (2008)
10.1088/1751-8113/41/13/135003
null
cond-mat.stat-mech hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The critical behaviour of d-dimensional n-vector models at m-axial Lifshitz points is considered for general values of m in the large-n limit. It is proven that the recently obtained large-N expansions [J. Phys.: Condens. Matter 17, S1947 (2005)] of the correlation exponents \eta_{L2}, \eta_{L4} and the related anisotropy exponent \theta are fully consistent with the dimensionality expansions to second order in \epsilon=4+m/2-d [Phys. Rev. B 62, 12338 (2000); Nucl. Phys. B 612, 340 (2001)] inasmuch as both expansions yield the same contributions of order \epsilon^2/n.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 08:28:13 GMT" } ]
"2008-03-20T00:00:00"
[ [ "Shpot", "M. A.", "" ], [ "Diehl", "H. W.", "" ], [ "Pis'mak", "Yu. M.", "" ] ]
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802.2435
Victor Mironov
Victor L. Mironov, Sergey V. Mironov
Octonic Electrodynamics
12 pages, 1 figure
Journal of Mathematical Physics, 50, 012901 (2009)
10.1063/1.3041499
null
math-ph math.MP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper we present eight-component values "octons", generating associative noncommutative algebra. It is shown that the electromagnetic field in a vacuum can be described by a generalized octonic equation, which leads both to the wave equations for potentials and fields and to the system of Maxwell's equations. The octonic algebra allows one to perform compact combined calculations simultaneously with scalars, vectors, pseudoscalars and pseudovectors. Examples of such calculations are demonstrated by deriving the relations for energy, momentum and Lorentz invariants of the electromagnetic field. The generalized octonic equation for electromagnetic field in a matter is formulated.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 08:31:12 GMT" }, { "version": "v2", "created": "Thu, 26 Jun 2014 08:05:37 GMT" } ]
"2014-06-27T00:00:00"
[ [ "Mironov", "Victor L.", "" ], [ "Mironov", "Sergey V.", "" ] ]
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802.2436
Stefan Schulz
S. Schulz, S. Schumacher, G. Czycholl
Spin-orbit coupling and crystal-field splitting in the electronic and optical properties of nitride quantum dots with a wurtzite crystal structure
9 pages, 6 figures
null
10.1140/epjb/e2008-00269-7
null
cond-mat.mtrl-sci
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present an $sp^3$ tight-binding model for the calculation of the electronic and optical properties of wurtzite semiconductor quantum dots (QDs). The tight-binding model takes into account strain, piezoelectricity, spin-orbit coupling and crystal-field splitting. Excitonic absorption spectra are calculated using the configuration interaction scheme. We study the electronic and optical properties of InN/GaN QDs and their dependence on structural properties, crystal-field splitting, and spin-orbit coupling.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 08:36:54 GMT" } ]
"2009-11-13T00:00:00"
[ [ "Schulz", "S.", "" ], [ "Schumacher", "S.", "" ], [ "Czycholl", "G.", "" ] ]
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802.2437
Mohsen Nejad-Asghar
M. Nejad-Asghar and D. Molteni
Modeling fragmentation of the self-gravitating molecular layer by smoothed particle hydrodynamics
to appear in proceeding of The JENAM 2007, August 20-25, Yerevan, Armenia
null
null
null
astro-ph
http://creativecommons.org/licenses/by/3.0/
We revisit the modeling of ion-neutral (or ambipolar) diffusion with two fluid smoothed particle hydrodynamics, as discussed by Hosking & Whitworth. Some parts of the technique are optimized to testify the pioneer works on behavior of the ambipolar diffusion in an isothermal self-gravitating layer. The frictional heating by ambipolar diffusion is examined, and its effect on fragmentation of the layer is studied. The results are compared to the thermal phases of instability as obtained by Nejad-Asghar.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 08:47:34 GMT" }, { "version": "v2", "created": "Sun, 13 Apr 2008 04:43:31 GMT" } ]
"2008-04-13T00:00:00"
[ [ "Nejad-Asghar", "M.", "" ], [ "Molteni", "D.", "" ] ]
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802.2438
Ion Dinca Mr
Ion I. Dinca
Peterson's Deformations of Higher Dimensional Quadrics
null
SIGMA 6 (2010), 006, 13 pages
10.3842/SIGMA.2010.006
null
math.DG
http://creativecommons.org/licenses/by-nc-sa/3.0/
We provide the first explicit examples of deformations of higher dimensional quadrics: a straightforward generalization of Peterson's explicit 1-dimensional family of deformations in $\mathbb{C}^3$ of 2-dimensional general quadrics with common conjugate system given by the spherical coordinates on the complex sphere $\mathbb{S}^2\subset\mathbb{C}^3$ to an explicit $(n-1)$-dimensional family of deformations in $\mathbb{C}^{2n-1}$ of $n$-dimensional general quadrics with common conjugate system given by the spherical coordinates on the complex sphere $\mathbb{S}^n\subset\mathbb{C}^{n+1}$ and non-degenerate joined second fundamental forms. It is then proven that this family is maximal.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 08:56:14 GMT" }, { "version": "v2", "created": "Tue, 19 Feb 2008 06:20:49 GMT" }, { "version": "v3", "created": "Tue, 18 Mar 2008 09:35:40 GMT" }, { "version": "v4", "created": "Wed, 2 Apr 2008 06:10:45 GMT" }, { "version": "v5", "created": "Sat, 5 Apr 2008 06:22:00 GMT" }, { "version": "v6", "created": "Sun, 13 Apr 2008 10:48:36 GMT" }, { "version": "v7", "created": "Tue, 15 Apr 2008 11:41:28 GMT" }, { "version": "v8", "created": "Wed, 20 Jan 2010 07:20:06 GMT" } ]
"2010-01-20T00:00:00"
[ [ "Dinca", "Ion I.", "" ] ]
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802.2439
Vinod Kumar
Vinod Kumar P.B., K. Babu Joseph
Fermats Last Theorem on Topological Fields
13 pages
null
null
null
math.GM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Even though flt is a number theoretic result we prove that the result depends on the topological as well as the field structure of the underlying space.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 09:10:20 GMT" } ]
"2008-02-19T00:00:00"
[ [ "B.", "Vinod Kumar P.", "" ], [ "Joseph", "K. Babu", "" ] ]
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802.244
Nivedita Deo
Itty Garg and N. Deo
Genus Distributions For Extended Matrix Models Of RNA
15 pages, 4 figures, 3 tables
null
null
null
cond-mat.stat-mech cond-mat.soft q-bio.BM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We construct and study an extended random matrix model of RNA (polymer) folding. A perturbation which acts on all the nucleotides in the chain is added to the action of the RNA partition function. The effect of this perturbation on the partition function and the Genus Distributions is studied. This perturbation distinguishes between the paired and unpaired bases. For example, for $\alpha = 1$ (where $\alpha$ is the ratio of the strengths of the original and perturbed term in the action) the partition function and genus distribution for odd lengths vanish completely. This partition function and the genus distribution is non-zero for even lengths where structures with fully paired bases only remain. This implies that (i). the genus distributions are different and (ii). there is a ``structural transition'' (from an ``unpaired-paired base phase'' to a ``completely paired base phase'') as $\alpha$ approaches 1 in the extended matrix models. We compare the results of the extended RNA model with the results of G. Vernizzi, H. Orland and A. Zee in PRL 94, 168103(2005).
[ { "version": "v1", "created": "Mon, 18 Feb 2008 09:23:07 GMT" }, { "version": "v2", "created": "Wed, 23 Apr 2008 12:44:08 GMT" } ]
"2008-04-23T00:00:00"
[ [ "Garg", "Itty", "" ], [ "Deo", "N.", "" ] ]
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802.2441
Adrien Dubouloz
Adrien Dubouloz (IMB), St\'ephane Lamy (ICJ)
Variations on Log Sarkisov Program for Surfaces
Revised and enlarged version with new examples and applications
null
null
null
math.AG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Let (S, BS) be the log-pair associated with a compactification of a given smooth quasi-projective surface V . Under the assumption that the boundary BS is irreducible, we propose an algorithm, in the spirit of the (log) Sarkisov program, to factorize any automorphism of V into a sequence of elementary links in the framework of the logarithmic Mori theory. The new noteworthy feature of our algorithm is that all the blow-ups and contractions involved in the process occur on the boundary.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 09:26:16 GMT" }, { "version": "v2", "created": "Wed, 11 Feb 2009 15:34:49 GMT" } ]
"2009-02-11T00:00:00"
[ [ "Dubouloz", "Adrien", "", "IMB" ], [ "Lamy", "Stéphane", "", "ICJ" ] ]
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802.2442
Nils Paar Dr.
T. Niksic, D. Vretenar, G. A. Lalazissis, and P. Ring
Finite- to zero-range relativistic mean-field interactions
25 pages, 5 figures, accepted for publication in Physical Review C
Phys.Rev.C77:034302,2008
10.1103/PhysRevC.77.034302
null
nucl-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the relation between the finite-range (meson-exchange) and zero-range (point-coupling) representations of effective nuclear interactions in the relativistic mean-field framework. Starting from the phenomenological interaction DD-ME2 with density-dependent meson-nucleon couplings, we construct a family of point-coupling effective interactions for different values of the strength parameter of the isoscalar-scalar derivative term. In the meson-exchange picture this corresponds to different values of the $\sigma$-meson mass. The parameters of the isoscalar-scalar and isovector-vector channels of the point-coupling interactions are adjusted to nuclear matter and ground-state properties of finite nuclei. By comparing results for infinite and semi-infinite nuclear matter, ground-state masses, charge radii, and collective excitations, we discuss constraints on the parameters of phenomenological point-coupling relativistic effective interaction.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 09:41:23 GMT" }, { "version": "v2", "created": "Thu, 6 Mar 2008 16:10:00 GMT" } ]
"2008-11-26T00:00:00"
[ [ "Niksic", "T.", "" ], [ "Vretenar", "D.", "" ], [ "Lalazissis", "G. A.", "" ], [ "Ring", "P.", "" ] ]
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802.2443
John V. Corbett
John V. Corbett and Dipankar Home
Bell's Inequality, Quantum Measurement and Einstein Realism: A Unified Perspective
15 pages
null
null
null
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The logical foundations of Bell's inequality are reexamined. We argue that the form of the reality condition that underpins Bell's inequality comes from the requirement of solving the quantum measurement problem. Hence any violation of Bell's inequality necessarily implies nonlocality because of the measurement problem. The differences in the implications of deterministic and stochastic formulations of Bell's inequality are highlighted. The reality condition used in Bell's inequality is shown to be a generalisation of Einstein's later form of realism.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 09:48:49 GMT" } ]
"2008-02-19T00:00:00"
[ [ "Corbett", "John V.", "" ], [ "Home", "Dipankar", "" ] ]
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802.2444
Paul Walmsley
P. M. Walmsley and A. I. Golov
Quantum and quasiclassical types of superfluid turbulence
Final version. 4 pages, 5 figures
Phys. Rev. Lett. 100, 245301 (2008)
10.1103/PhysRevLett.100.245301
null
cond-mat.other
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
By injecting negative ions in superfluid 4He in the zero-temperature limit (T < 0.5 K), we generated tangles of quantized vortex line with negligible large-scale flow. For this quantum regime of superfluid turbulence, the vortex line length L was found to decay at late time t as L proportional to t^{-1}; the prefactor being independent of the initial value of L. The corresponding effective kinematic viscosity is 0.1 kappa, where kappa is the circulation quantum. At T > 0.7 K, a jet of ions generates quasi-classical tangles identical to those produced by mechanical means.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 12:57:34 GMT" }, { "version": "v2", "created": "Wed, 1 Oct 2008 08:47:49 GMT" } ]
"2008-10-01T00:00:00"
[ [ "Walmsley", "P. M.", "" ], [ "Golov", "A. I.", "" ] ]
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802.2445
Kuo-Chang Chen
Kuo-Chang Chen and Xun Dong
On the mass center of the tent map
15 pages
null
null
null
math.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
It is well known that the time average or the center of mass for generic orbits of the standard tent map is 0.5. In this paper we show some interesting properties of the exceptional orbits, including periodic orbits, orbits without mass center, and orbits with mass centers different from 0.5. We prove that for any positive integer $n$, there exist $n$ distinct periodic orbits for the standard tent map with the same center of mass, and the set of mass centers of periodic orbits is a dense subset of $[0,2/3]$. Considering all possible orbits, then the set of mass centers is the interval $[0,2/3]$. Moreover, for every $x$ in $[0,2/3]$, there are uncountably many orbits with mass center $x$. We also show that there are uncountably many orbits without mass center.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 10:00:00 GMT" } ]
"2008-02-19T00:00:00"
[ [ "Chen", "Kuo-Chang", "" ], [ "Dong", "Xun", "" ] ]
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802.2446
Sambaran Banerjee Mr.
Sambaran Banerjee and Pranab Ghosh
Evolution of Compact-Binary Populations in Globular Clusters: A Boltzmann Study II. Introducing Stochasticity
32 pages, 8 figures. To be published in the Astrophysical Journal, Vol. 680, No.1, June 10, 2008. Minor revision in abstract
null
10.1086/587677
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We continue exploration of the Boltzmann scheme started in Banerjee and Ghosh (2007, henceforth Paper I) for studying the evolution of compact-binary populations of globular clusters, introducing in this paper our method of handling the stochasticity inherent in dynamical processes of binary formation, destruction and hardening in globular clusters. We describe these stochastic processes as "Wiener processes", whereupon the Boltzmann equation becomes a stochastic partial differential equation, the solution of which requires the use of "Ito calculus" (this use being the first, to our knowledge, in this subject), in addition to ordinary calculus. We focus on the evolution of (a) the number of X-ray binaries $N_{XB}$ in globular clusters, and (b) the orbital-period distribution of these binaries. We show that, although the details of the fluctuations in the above quantities differ from one "realization" to another of the stochastic processes, the general trends follow those found in the continuous-limit study of Paper I, and the average result over many such realizations is close to the continuous-limit result. We investigate the dependence of $N_{XB}$ found by these calculations on two essential globular-cluster parameters, namely, the star-star and star-binary encounter-rate parameters $\Gamma$ and $\gamma$, for which we had coined the name Verbunt parameters in Paper I. We compare our computed results with those from CHANDRA observations of Galactic globular clusters, showing that the expected scalings of $N_{XB}$ with the Verbunt parameters are in good agreement with the observed ones. We indicate what additional features can be incorporated into the scheme in future, and how more elaborate problems can be tackled.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 10:04:06 GMT" }, { "version": "v2", "created": "Wed, 20 Feb 2008 08:57:26 GMT" }, { "version": "v3", "created": "Mon, 14 Apr 2008 19:41:22 GMT" } ]
"2009-11-13T00:00:00"
[ [ "Banerjee", "Sambaran", "" ], [ "Ghosh", "Pranab", "" ] ]
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802.2447
Ugo Moschella
Ugo Moschella, Richard Schaeffer
A note on canonical quantization of fields on a manifold
null
JCAP 0902:033,2009
10.1088/1475-7516/2009/02/033
null
gr-qc hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We propose a general construction of quantum states for linear canonical quantum fields on a manifold, which encompasses and generalizes the "standard" procedures existing in textbooks. Our method provides pure and mixed states on the same footing. A large class of examples finds a simple and unified treatment in our approach. Applications discussed here include thermodynamical equilibrium states for Minkowski fields and quantum field theory in the Rindler's and in the open de Sitter universes. Our approach puts the above examples into perspective and unravels new possibilities for quantization. We call our generalization "extended canonical quantization" as it is suited to attack cases not directly covered by the standard canonical approach.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 13:32:42 GMT" }, { "version": "v2", "created": "Wed, 1 Apr 2009 14:17:15 GMT" } ]
"2009-04-01T00:00:00"
[ [ "Moschella", "Ugo", "" ], [ "Schaeffer", "Richard", "" ] ]
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802.2448
Jonathan Silman
Y. Strauss, J. Silman, S. Machnes, L.P. Horwitz
An Arrow of Time Operator for Standard Quantum Mechanics
5 pages, 2 figures
null
null
null
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We introduce a self-adjoint operator that indicates the direction of time within the framework of standard quantum mechanics. That is, as a function of time its expectation value decreases monotonically for any initial state. This operator can be defined for any system governed by a Hamiltonian with a uniformly finitely degenerate, absolutely continuous and semibounded spectrum. We study some of the operator's properties and illustrate them for a large equivalence class of scattering problems. We also discuss some previous attempts to construct such an operator, and show that the no-go theorems developed in this context are not applicable to our construction.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 10:11:00 GMT" } ]
"2008-02-19T00:00:00"
[ [ "Strauss", "Y.", "" ], [ "Silman", "J.", "" ], [ "Machnes", "S.", "" ], [ "Horwitz", "L. P.", "" ] ]
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802.2449
Bin Wang
Xi He, Songbai-Chen, Bin Wang, Rong-Gen Cai and Chi-Yong Lin
Quasinormal modes in the background of charged Kaluza-Klein black hole with squashed horizons
revised version, accepted for publication in Phys.Lett.B
Phys.Lett.B665:392-400,2008
10.1016/j.physletb.2008.06.038
null
hep-th gr-qc
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the scalar perturbation in the background of the charged Kaluza-Klein black holes with squashed horizons. We find that the position of infinite discontinuities of the heat capacities can be reflected in quasinormal spectrum. This shows the possible non-trivial relation between the thermodynamical and dynamical properties of black holes.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 10:24:09 GMT" }, { "version": "v2", "created": "Tue, 17 Jun 2008 11:54:45 GMT" } ]
"2008-11-26T00:00:00"
[ [ "He", "Xi", "" ], [ "Songbai-Chen", "", "" ], [ "Wang", "Bin", "" ], [ "Cai", "Rong-Gen", "" ], [ "Lin", "Chi-Yong", "" ] ]
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802.245
Z. Ya. Turakulov
A.T. Muminov
Motion of Spin 1/2 Massless Particle in a Curved Spacetime. I. Lagrangian Approach
7 pages
null
null
null
gr-qc
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Quasi-classical picture of motion of spin 1/2 massless particle in a curved spacetime is built on base of simple Lagrangian model. The one is constructed due to analogy with Lagrangian of massive spin 1/2 particle. Equations of motion and spin propagation coincide with Papapetrou equations describing dynamic of photon in a curved spacetime.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 10:31:45 GMT" } ]
"2008-02-19T00:00:00"
[ [ "Muminov", "A. T.", "" ] ]
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802.2451
Georg Bocherer
Georg Bocherer and Valdemar Cardoso da Rocha Junior and Cecilio Pimentel
Capacity of General Discrete Noiseless Channels
4 pages. Essentially the paper that appeared in Proc. ISCTA '07, 2007. From v1 to v2, one error was corrected
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper concerns the capacity of the discrete noiseless channel introduced by Shannon. A sufficient condition is given for the capacity to be well-defined. For a general discrete noiseless channel allowing non-integer valued symbol weights, it is shown that the capacity--if well-defined--can be determined from the radius of convergence of its generating function, from the smallest positive pole of its generating function, or from the rightmost real singularity of its complex generating function. A generalisation is given for Pringsheim's Theorem and for the Exponential Growth Formula to generating functions of combinatorial structures with non-integer valued symbol weights.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 11:06:47 GMT" }, { "version": "v2", "created": "Thu, 10 Jun 2010 11:08:11 GMT" } ]
"2010-06-11T00:00:00"
[ [ "Bocherer", "Georg", "" ], [ "Junior", "Valdemar Cardoso da Rocha", "" ], [ "Pimentel", "Cecilio", "" ] ]
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802.2452
Jun'ichi Yokoyama
Kazunori Nakayama, Shun Saito, Yudai Suwa, and Jun'ichi Yokoyama
Space laser interferometers can determine the thermal history of the early Universe
5 pages
Phys.Rev.D77:124001,2008
10.1103/PhysRevD.77.124001
RESCEU-2/08,UTAP-594
hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
It is shown that space-based gravitational wave detectors such as DECIGO and/or Big Bang Observer (BBO) will provide us with invaluable information on the cosmic thermal history after inflation and they will be able to determine the reheat temperature $T_R$ provided that it lies in the range preferred by the cosmological gravitino problem, $T_R\sim 10^{5-9}$ GeV. Therefore it is strongly desired that they will be put into practice as soon as possible.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 11:59:24 GMT" } ]
"2008-11-26T00:00:00"
[ [ "Nakayama", "Kazunori", "" ], [ "Saito", "Shun", "" ], [ "Suwa", "Yudai", "" ], [ "Yokoyama", "Jun'ichi", "" ] ]
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802.2453
Steven Thomas
Vincenzo Cal\`o and Steven Thomas
Phase Transitions in Separated $D_{p-1}$ and anti-$D_{p-1}$ Branes at Finite Temperature
25 pages, 4 figures; Clarifications added to Section 3 concerning winding modes; updated plots of the effective potential in section 4; typos corrected. Version to be published in JHEP
JHEP 0806:093,2008
10.1088/1126-6708/2008/06/093
QMUL-PH-08-04
hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider a pair of parallel ${\rm D}_{p-1}$ and anti-${\rm D}_{p-1}$ branes in flat space, with a finite separation $d$ along some perpendicular spatial direction and at finite temperature. If this spatial direction is compactified on a circle then by T-duality, the system is equivalent to a ${\rm D}_{p}$-anti ${\rm D}_{p} $ pair wrapped around the dual circle with a constant Wilson line $A \approx d $ on one of the branes. We focus in particular on the $p=9$ case and compute the free energy of this system and study the occurrence of second order phase transitions as both the temperature and Wilson line (brane-antibrane separation) are varied. In the limit of vanishing Wilson line we recover the previous results obtained in the literature, whereby the open string vacuum at the origin of the tachyon field T=0 is stabilized at sufficiently high temperature at which a second order phase transition occurs. For sufficiently large Wilson line, we find new second order phase transitions corresponding to the existence of two minima in the tachyon effective potential at finite temperature and tachyon field value. Entropic arguments suggest that as the system cools, the tachyon is likely to find itself in the minimum that approaches infinity as the temperature vanishes (i.e. the one corresponding to the closed string vacuum), rather than the minimum at T=0 (corresponding to the open string vacuum).
[ { "version": "v1", "created": "Mon, 18 Feb 2008 10:41:35 GMT" }, { "version": "v2", "created": "Wed, 18 Jun 2008 15:12:52 GMT" } ]
"2014-11-18T00:00:00"
[ [ "Calò", "Vincenzo", "" ], [ "Thomas", "Steven", "" ] ]
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802.2454
Wlodzimierz Jelonek
Wlodzimierz Jelonek
On A-tensors in Riemannian geometry
12 pages, preprint PAN 551,1995
null
null
null
math.DG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present examples, both compact and non-compact complete, of lo- cally non-homogeneous proper A-manifolds.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 11:03:24 GMT" } ]
"2008-02-19T00:00:00"
[ [ "Jelonek", "Wlodzimierz", "" ] ]
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802.2455
Frank Kr\"uger
J. Zaanen, F. Kr\"uger, J.-H. She, D. Sadri, S. I. Mukhin
Pacifying the Fermi-liquid: battling the devious fermion signs
28 pages, 5 figures
null
null
null
cond-mat.other
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The fermion sign problem is studied in the path integral formalism. The standard picture of Fermi liquids is first critically analyzed, pointing out some of its rather peculiar properties. The insightful work of Ceperley in constructing fermionic path integrals in terms of constrained world-lines is then reviewed. In this representation, the minus signs associated with Fermi-Dirac statistics are self consistently translated into a geometrical constraint structure (the {\em nodal hypersurface}) acting on an effective bosonic dynamics. As an illustrative example we use this formalism to study 1+1-dimensional systems, where statistics are irrelevant, and hence the sign problem can be circumvented. In this low-dimensional example, the structure of the nodal constraints leads to a lucid picture of the entropic interaction essential to one-dimensional physics. Working with the path integral in momentum space, we then show that the Fermi gas can be understood by analogy to a Mott insulator in a harmonic trap. Going back to real space, we discuss the topological properties of the nodal cells, and suggest a new holographic conjecture relating Fermi liquids in higher dimensions to soft-core bosons in one dimension. We also discuss some possible connections between mixed Bose/Fermi systems and supersymmetry.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 11:09:46 GMT" } ]
"2008-02-19T00:00:00"
[ [ "Zaanen", "J.", "" ], [ "Krüger", "F.", "" ], [ "She", "J. -H.", "" ], [ "Sadri", "D.", "" ], [ "Mukhin", "S. I.", "" ] ]
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802.2456
Shailesh Kulkarni
Shailesh Kulkarni
Hawking Fluxes, Back reaction and Covariant Anomalies
6 pages, no figures, minor changes and references added, to appear in Classical and Quantum Gravity
Class.Quant.Grav.25:225023,2008
10.1088/0264-9381/25/22/225023
null
hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Starting from the chiral covariant effective action approach of Banerjee and Kulkarni [Phys. Lett. B 659, 827(2008)], we provide a derivation of the Hawking radiation from a charged black hole in the presence of gravitational back reaction. The modified expressions for charge and energy flux, due to effect of one loop back reaction are obtained.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 11:09:49 GMT" }, { "version": "v2", "created": "Tue, 16 Sep 2008 17:13:43 GMT" } ]
"2008-11-26T00:00:00"
[ [ "Kulkarni", "Shailesh", "" ] ]
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802.2457
Shachar Klaiman
Shachar Klaiman, Nimrod Moiseyev, and Uwe Gunther
Visualization of Branch Points in PT-Symmetric Waveguides
null
Phys.Rev.Lett.101:080402,2008
10.1103/PhysRevLett.101.080402
null
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The visualization of an exceptional point in a PT symmetric directional coupler(DC) is demonstrated. In such a system the exceptional point can be probed by varying only a single parameter. Using the Rayleigh-Schroedinger perturbation theory we prove that the spectrum of a PT symmetric Hamiltonian is real as long as the radius of convergence has not been reached. We also show how one can use a PT symmetric DC to measure the radius of convergence for non PT symmetric structures. For such systems the physical meaning of the rather mathematical term: radius of convergence, is exemplified.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 11:19:52 GMT" } ]
"2008-11-26T00:00:00"
[ [ "Klaiman", "Shachar", "" ], [ "Moiseyev", "Nimrod", "" ], [ "Gunther", "Uwe", "" ] ]
[ -0.0338663347, 0.0246964563, 0.0286457241, 0.021504581, -0.0185696799, 0.077091895, -0.0590226352, 0.0667047724, 0.0237632375, 0.063512899, 0.0728180259, 0.0006191866, -0.000595518, -0.0177040864, 0.0753066093, 0.0030616978, -0.0334335379, 0.0032290684, 0.0208283365, 0.1542919874, 0.0259407461, 0.0604292266, -0.0261030458, 0.0397631861, -0.0378426537, -0.0186914038, -0.0135722309, 0.0464444868, 0.157537967, 0.0013279755, 0.118910864, -0.0643243939, -0.0126390131, -0.0290785208, -0.1284323931, 0.152128011, -0.0239255372, 0.0579406433, -0.0771459937, 0.0989481211, 0.0044057341, 0.098244831, -0.0806624666, 0.0683818609, 0.1066843644, -0.0397902392, 0.005568875, 0.0514486954, -0.0003596777, -0.0368959084, 0.0142011382, 0.1406589001, 0.0564258583, -0.0488789678, -0.0888314992, -0.0741705149, 0.0416025743, 0.0605915226, 0.0280235801, -0.0642161965, 0.0962972417, -0.0881282091, -0.0273338109, 0.0527470857, -0.0880200118, -0.041846022, -0.0025054866, 0.0558848605, 0.0322433449, -0.0102924444, 0.0530446321, 0.0847740322, -0.0408451781, -0.0074792663, 0.1401178986, 0.0434960574, -0.0792558789, 0.0557766631, -0.0216804054, -0.059455432, 0.0369500108, -0.0768754929, -0.0569668524, -0.0560471602, 0.0269010141, -0.0090616792, -0.0331900902, 0.0041690483, -0.0430632606, 0.0231275689, 0.0495822616, -0.0410074778, -0.0102924444, 0.0084665837, -0.0454165936, -0.0124023277, 0.0413050242, 0.013220584, -0.0149179576, 0.0062958379, 0.019381173, -0.040574681, 0.0228029713, -0.0775246918, 0.1645709127, -0.0001563816, 0.0921856761, 0.0364360623, -0.0048520556, 0.0325679444, 0.0269145388, -0.0544512235, -0.0327572934, 0.0944578573, 0.0531528331, -0.022816496, 0.0208283365, -0.0790394768, 0.0655686855, 0.0233169161, -0.044632148, 0.0577783473, 0.0697343498, -0.0250075292, 0.081149362, -0.0576160476, -0.0058833286, -0.0181909818, -0.0540995747, -0.0402771346, 0.0678408667, -0.0275231581, 0.0194623228, -0.0109686889, 0.0182315558, -0.0248587541, 0.0217074547, -0.0050650728, 0.1064679623, -0.0342450291, 0.0228435453, 0.0373557582, 0.1634889096, -0.0404123813, 0.0484732203, 0.1044121832, -0.0815821588, 0.1391441077, 0.0101369079, 0.0063431752, -0.0840707421, -0.0530175827, 0.0329466425, -0.1041416824, -0.0562094599, -0.0152425552, 0.0278071817, 0.1109041274, -0.0454706922, -0.0327302441, 0.0098393606, 0.007161431, -0.0483920686, 0.0677326694, 0.0135992803, -0.0610784218, -0.041737821, -0.0065764794, -0.0623768084, -0.0880200118, -0.087911807, -0.1871845275, -0.1523444057, 0.0923479721, 0.1237798259, 0.0734672248, 0.0012552792, -0.1238880232, -0.0082975226, -0.0119762933, 0.0441723019, 0.0297818165, 0.0295924675, 0.0147286095, -0.0212476086, 0.0643243939, 0.0579406433, 0.0304851104, -0.0174065381, -0.0538020283, -0.0363008156, 0.036327865, 0.1072253585, 0.0426845662, -0.0053558578, -0.1278913915, -0.0097582107, 0.0159593746, -0.0087370817, -0.1241044253, -0.0005219764, -0.0563717559, 0.0648112893, -0.0115570221, -0.0319728479, 0.0519626401, 0.0655686855, 0.0271850359, -0.0335417353, 0.0224918984, 0.0354352221, 0.0384377465, 0.0993809178, 0.0106508536, 0.0749279112, -0.0532610305, -0.0759558007, 0.0719524324, -0.0423599668, 0.0404394306, -0.0817444548, 0.0265493672, 0.0921856761, 0.1054400727, 0.0395467877, 0.0774164945, 0.0019712532, -0.0226947721, -0.0414402746, -0.0479863212, -0.023005845, -0.0240878351, 0.0479051732, 0.0398443379, -0.0197598692, 0.0099407965, 0.0067421594, 0.0085747829, -0.1272422075, -0.1936764717, -0.0631342009, -0.0073169675, 0.0740082189, 0.0242636595, 0.04717483, 0.0330818892, -0.0162028223, 0.0908872858, 0.0510970503, -0.0080608362, 0.0352729224, 0.0253727008, -0.0614571162, 0.0445239507, -0.0614571162, 0.1168550849 ]
802.2458
Hatziminaoglou Evanthia
E. Hatziminaoglou, J. Fritz, A. Franceschini, A. Afonso-Luis, A. Hernan-Caballero, I. Perez-Fournon, S. Serjeant, C. Lonsdale, S. Oliver, M. Rowan-Robinson, D. Shupe, H.E. Smith, J. Surace
Properties of dusty tori in AGN: I. The Case of SWIRE/SDSS Quasars
Full length tables 1 & 2 were omitted from the on-line issue, they can be directly retrieved from the CDS ftp site: http://cdsarc.u-strasbg.fr/viz-bin/ftp-index?J/MNRAS/386/1252
MNRAS, Volume 386, Issue 3, Page 1252-1264, May 2008
10.1111/j.1365-2966.2008.13119.x
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We derive the properties of dusty tori in Active Galactic Nuclei (AGN) from the comparison of observed Spectral Energy Distributions (SEDs) of SDSS quasars and a precomputed grid of torus models. The observed SEDs comprise SDSS photometry, 2MASS J, H, and K data, whenever available and mid-Infrared (MIR) data from the Spitzer Wide-area InfraRed Extragalactic (SWIRE) Survey. The adopted model is that of Fritz et al., 2006. The fit is performed by standard chi^2 minimisation, the model however can be multi-component comprising a stellar and a starburst components, whenever necessary. Models with low equatorial optical depth, tau_9.7, were allowed as well as ``traditional'' models with tau_9.7 > 1.0, corresponding to A_V > 22 and the results were compared. Fits using high optical depth tori models only produced dust more compactly distributed than in the configuration where all tau_9.7 models were permitted. Tori with decreasing dust density with the distance from the centre were favoured while there was no clear preference for models with or without angular variation of the dust density. The computed outer radii of the tori are of some tens of parsecs large but can reach, in a few cases, a few hundreds of parsecs. The mass of dust, M_Dust, and infrared luminosity, L_IR, integrated in the wavelength range between 1 and 1000 micron, do not show significant variations with redshift, once the observational biases are taken into account. Objects with 70 micron detections, representing 25% of the sample, are studied separately and the starburst contribution (whenever present) to the IR luminosity can reach, in the most extreme but very few cases, 80%.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 11:13:14 GMT" }, { "version": "v2", "created": "Thu, 5 Jun 2008 11:53:39 GMT" } ]
"2009-11-13T00:00:00"
[ [ "Hatziminaoglou", "E.", "" ], [ "Fritz", "J.", "" ], [ "Franceschini", "A.", "" ], [ "Afonso-Luis", "A.", "" ], [ "Hernan-Caballero", "A.", "" ], [ "Perez-Fournon", "I.", "" ], [ "Serjeant", "S.", "" ], [ "Lonsdale", "C.", "" ], [ "Oliver", "S.", "" ], [ "Rowan-Robinson", "M.", "" ], [ "Shupe", "D.", "" ], [ "Smith", "H. E.", "" ], [ "Surace", "J.", "" ] ]
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802.2459
Harald Dimmelmeier
Bernhard Mueller, Harald Dimmelmeier, Ewald Mueller
Exploring the relativistic regime with Newtonian hydrodynamics: II. An effective gravitational potential for rapid rotation
15 pages, 12 figures, minor modifications
null
10.1051/0004-6361:200809609
null
astro-ph gr-qc
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present the generalization of a recently introduced modified gravitational potential for self-gravitating fluids. The use of this potential allows for an accurate approximation of general relativistic effects in an otherwise Newtonian hydrodynamics code also in cases of rapid rotation. We test this approach in numerical simulations of astrophysical scenarios related to compact stars, like supernova core collapse with both a simplified and detailed microphysical description of matter, and rotating neutron stars in equilibrium. We assess the quality of the new potential, and demonstrate that it provides a significant improvement compared to previous formulations for such potentials. Newtonian simulations of compact objects employing such an effective relativistic potential predict inaccurate pulsation frequencies despite the excellent agreement of the collapse dynamics and structure of the compact objects with general relativistic results. We analyze and discuss the reason for this behavior.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 15:41:23 GMT" }, { "version": "v2", "created": "Mon, 8 Sep 2008 17:21:41 GMT" } ]
"2009-11-13T00:00:00"
[ [ "Mueller", "Bernhard", "" ], [ "Dimmelmeier", "Harald", "" ], [ "Mueller", "Ewald", "" ] ]
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802.246
Matthew Pitkin
Matthew Pitkin, James Clark, Martin A. Hendry, Ik Siong Heng, Chris Messenger, Jennifer Toher and Graham Woan
Is there potential complementarity between LISA and pulsar timing?
5 pages, 2 figures, submitted for the proceedings of the Amaldi 7 conference
J.Phys.Conf.Ser.122:012004,2008
10.1088/1742-6596/122/1/012004
null
astro-ph gr-qc
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We open the discussion into how the Laser Interferometer Space Antenna (LISA) observations of supermassive black-hole (SMBH) mergers (in the mass range ~10^6-10^8 Msun) may be complementary to pulsar timing-based gravitational wave searches. We consider the toy model of determining pulsar distances by exploiting the fact that LISA SMBH inspiral observations can place tight parameter constraints on the signal present in pulsar timing observations. We also suggest, as a future path of research, the use of LISA ring-down observations from the most massive (>~ a few 10^7 Msun) black-hole mergers, for which the inspiral stage will lie outside the LISA band, as both a trigger and constraint on searches within pulsar timing data for the inspiral stage of the merger.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 11:52:52 GMT" } ]
"2009-06-23T00:00:00"
[ [ "Pitkin", "Matthew", "" ], [ "Clark", "James", "" ], [ "Hendry", "Martin A.", "" ], [ "Heng", "Ik Siong", "" ], [ "Messenger", "Chris", "" ], [ "Toher", "Jennifer", "" ], [ "Woan", "Graham", "" ] ]
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802.2461
Stefan Scherer
S. Scherer (Mainz U., Inst. f. Kernphysik)
Effective Field Theory of the Single-Nucleon Sector
4 pages, talk at "Chiral Symmetry in Hadron and Nuclear Physics" (Chiral 07), Osaka, Japan, 13-16 Nov. 2007
Mod.Phys.Lett.A23:2289-2292,2008
10.1142/S0217732308029216
MKPH-T-08-02
hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We address the issue of a consistent power counting scheme in manifestly Lorentz-invariant baryon chiral perturbation theory. We discuss the inclusion of vector mesons in the calculation of the nucleon electromagnetic form factors. We comment on the chiral expansion of the nucleon mass to order O(q**6).
[ { "version": "v1", "created": "Mon, 18 Feb 2008 11:57:10 GMT" } ]
"2008-11-26T00:00:00"
[ [ "Scherer", "S.", "", "Mainz U., Inst. f. Kernphysik" ] ]
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802.2462
Oleg Tsupko
G.S. Bisnovatyi-Kogan and O.Yu. Tsupko
Primordial Black Hole: Mass and Angular Momentum Evolution
Gravitation and Cosmology, accepted, 3 pages, Talk presented at the russian summer school-seminar "Modern theoretical problems of gravitation and cosmology" (GRACOS-2007), September 9-16, 2007, Kazan-Yalchik, Russia
Grav.Cosmol.14:173-175,2008
10.1134/S0202289308020084
null
astro-ph gr-qc
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The evolution of the primordial low mass black hole (PBH) in hot universe is considered. Increase of mass and decrease of PBH spin due to the accretion of radiation dominated matter are estimated with using of results of numerical simulation of PBH formation and approximate relations for accretion to a rotating black hole.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 11:58:48 GMT" }, { "version": "v2", "created": "Wed, 20 Feb 2008 12:17:11 GMT" } ]
"2009-11-13T00:00:00"
[ [ "Bisnovatyi-Kogan", "G. S.", "" ], [ "Tsupko", "O. Yu.", "" ] ]
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802.2463
Daniel Klauser
D. Klauser, W. A. Coish, Daniel Loss
Nuclear spin dynamics and Zeno effect in quantum dots and defect centers
11 pages, 3 figures
Phys. Rev. B 78, 205301 (2008)
10.1103/PhysRevB.78.205301
null
cond-mat.mes-hall
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We analyze nuclear spin dynamics in quantum dots and defect centers with a bound electron under electron-mediated coupling between nuclear spins due to the hyperfine interaction ("J-coupling" in NMR). Our analysis shows that the Overhauser field generated by the nuclei at the position of the electron has short-time dynamics quadratic in time for an initial nuclear spin state without transverse coherence. The quadratic short-time behavior allows for an extension of the Overhauser field lifetime through a sequence of projective measurements (quantum Zeno effect). We analyze the requirements on the repetition rate of measurements and the measurement accuracy to achieve such an effect. Further, we calculate the long-time behavior of the Overhauser field for effective electron Zeeman splittings larger than the hyperfine coupling strength and find, both in a Dyson series expansion and a generalized master equation approach, that for a nuclear spin system with a sufficiently smooth polarization the electron-mediated interaction alone leads only to a partial decay of the Overhauser field by an amount on the order of the inverse number of nuclear spins interacting with the electron.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 12:05:02 GMT" } ]
"2008-11-04T00:00:00"
[ [ "Klauser", "D.", "" ], [ "Coish", "W. A.", "" ], [ "Loss", "Daniel", "" ] ]
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802.2464
Mifuyu Ukai
M. Ukai, et al
Gamma-Ray Spectroscopy of $^{16}_\Lambda$O and $^{15}_\Lambda$N Hypernuclei via the $^{16}$O$(K^-, \pi^-)$ reaction
22 pages, 17 figures
Phys.Rev.C77:054315,2008
10.1103/PhysRevC.77.054315
null
nucl-ex
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
he bound-state level structures of the $^{16}_{\Lambda}$O and $^{15}_{\Lambda}$N hypernuclei were studied by $\gamma$-ray spectroscopy using a germanium detector array (Hyperball) via the $^{16}$O ($K^-, \pi^- \gamma$) reaction. A level scheme for $^{16}_{\Lambda}$O was determined from the observation of three $\gamma$-ray transitions from the doublet of states ($2^-$,$1^-$) at $\sim 6.7$ MeV to the ground-state doublet ($1^-$,$0^-$). The $^{15}_{\Lambda}$N hypernuclei were produced via proton emission from unbound states in $^{16}_{\Lambda}$O . Three $\gamma$ -rays were observed and the lifetime of the $1/2^+;1$ state in $^{15}_{\Lambda}$N was measured by the Doppler shift attenuation method. By comparing the experimental results with shell-model calculations, the spin-dependence of the $\Lambda N$ interaction is discussed. In particular, the measured $^{16}_{\Lambda}$O ground-state doublet spacing of 26.4 $\pm$ 1.6 $\pm$ 0.5 keV determines a small but nonzero strength of the $\Lambda N$ tensor interaction.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 15:31:19 GMT" } ]
"2008-11-26T00:00:00"
[ [ "Ukai", "M.", "" ] ]
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802.2465
Kiyotaka Tanikawa
Kiyotaka Tanikawa and Seppo Mikkola
A trial symbolic dynamics of the planar three-body problem
Conference paper, 8 pages
null
null
null
nlin.CD
http://creativecommons.org/licenses/by-nc-sa/3.0/
Symbolic dynamics is applied to the planar three-body problem. Symbols are defined on the planar orbit when it experiences a syzygy crossing. If the body i is in the middle at the syzygy crossing and the vectorial area of the triangle made with three bodies changes sign from + to -, number i is given to this event, whereas if the vectorial area changes sign from - to +, number i+3 is given. We examine the case of free-fall three-body problem for the first few digits of symbol sequences, and we examine the case with angular momentum only for the first digit of the symbol sequences. This trial experiments show some new aspects of the planar three-body problem.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 12:20:29 GMT" } ]
"2008-02-19T00:00:00"
[ [ "Tanikawa", "Kiyotaka", "" ], [ "Mikkola", "Seppo", "" ] ]
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802.2466
Emanuela Bianchi
Emanuela Bianchi, Piero Tartaglia, Emanuela Zaccarelli, Francesco Sciortino
Theoretical and numerical study of the phase diagram of patchy colloids: ordered and disordered patch arrangements
preprint, 32 pages, 6 figures, 3 tables, J. Chem. Phys. in press
null
10.1063/1.2888997
null
cond-mat.soft
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We report theoretical and numerical evaluations of the phase diagram for a model of patchy particles. Specifically we study hard-spheres whose surface is decorated by a small number f of identical sites ("sticky spots'') interacting via a short-range square-well attraction. We theoretically evaluate, solving the Wertheim theory, the location of the critical point and the gas-liquid coexistence line for several values of f and compare them to results of Gibbs and Grand Canonical Monte Carlo simulations. We study both ordered and disordered arrangements of the sites on the hard-sphere surface and confirm that patchiness has a strong effect on the phase diagram: the gas-liquid coexistence region in the temperature-density plane is significantly reduced as f decreases. We also theoretically evaluate the locus of specific heat maxima and the percolation line.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 12:24:36 GMT" } ]
"2009-11-13T00:00:00"
[ [ "Bianchi", "Emanuela", "" ], [ "Tartaglia", "Piero", "" ], [ "Zaccarelli", "Emanuela", "" ], [ "Sciortino", "Francesco", "" ] ]
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802.2467
David Wood
David R. Wood
Folding = Colouring
I have discovered that the main result was first proved by Cook and Evans in 1979
null
null
null
math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The foldings of a connected graph $G$ are defined as follows. First, $G$ is a folding of itself. Let $G'$ be a graph obtained from $G$ by identifying two vertices at distance 2 in $G$. Then every folding of $G'$ is a folding of $G$. The folding number of $G$ is the minimum order of a complete folding of $G$. Theorem: The folding number of every graph equals its chromatic number.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 12:27:45 GMT" }, { "version": "v2", "created": "Mon, 25 Feb 2008 09:40:57 GMT" } ]
"2008-02-25T00:00:00"
[ [ "Wood", "David R.", "" ] ]
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802.2468
Guy Katriel
Michael Demuth, Marcel Hansmann, Guy Katriel
On the distribution of eigenvalues of non-selfadjoint operators
null
null
null
null
math.SP math.FA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We prove quantitative bounds on the eigenvalues of non-selfadjoint bounded and unbounded operators. We use the perturbation determinant to reduce the problem to one of studying the zeroes of a holomorphic function.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 12:36:54 GMT" } ]
"2008-02-19T00:00:00"
[ [ "Demuth", "Michael", "" ], [ "Hansmann", "Marcel", "" ], [ "Katriel", "Guy", "" ] ]
[ -0.0326285064, 0.0205691066, 0.1063235179, 0.0509626232, 0.0067886421, -0.0332739055, -0.0723325014, 0.0011137616, -0.0452974513, 0.0731452256, 0.0463253111, -0.0305010807, -0.0510582365, 0.0191946458, 0.0897343755, 0.0251705628, 0.0571775772, 0.0263657477, 0.0559345856, 0.0896865651, -0.0538310632, -0.0492893644, 0.0371941105, -0.0349232592, 0.0220391825, -0.0026996206, -0.0990568027, -0.0123462453, 0.1034550816, -0.0510582365, 0.0767785832, -0.0442695953, -0.078738682, -0.0728583857, -0.061145585, 0.2158979326, -0.0313616134, 0.0658307076, -0.0645399094, 0.0547872111, -0.0740057603, -0.0415206738, -0.1426571012, 0.0826588869, -0.0289951507, 0.0368833616, -0.0021677639, -0.061623659, 0.0107686026, 0.0110733742, -0.0622451529, 0.0671693087, 0.108331427, -0.0544525571, 0.0075236796, -0.0208798554, -0.1063235179, 0.0531139523, -0.0186209586, -0.0369550735, 0.0263179392, -0.1326175481, -0.0373614356, 0.021405736, -0.0957580954, -0.1047936827, -0.0855273306, 0.0380307361, 0.0610499717, 0.0510104299, -0.0828023106, 0.0688425675, 0.0326285064, 0.0199476127, -0.0031702241, 0.0207842402, -0.0279433895, 0.0569385402, -0.0572253838, 0.0386044271, 0.0987699628, 0.1011603251, -0.0205571558, 0.0608587414, -0.0122864861, -0.035234008, -0.0031343687, -0.0315289386, -0.1238210052, 0.0097526973, 0.0328675434, 0.0867225081, 0.0973357409, 0.0689859912, 0.0540222935, -0.0984831154, 0.0970488936, 0.0643008724, 0.0054590004, -0.0277999677, -0.061862696, 0.1169367507, 0.1035506949, -0.0056442539, 0.1114867106, 0.0767785832, -0.0294254161, 0.0029371632, 0.013517525, 0.0337519795, -0.0406123325, -0.0421182662, 0.0020467516, -0.052444648, 0.0549306311, -0.0067288829, -0.0705636293, -0.0707548633, -0.0110375192, 0.0158481319, -0.0103204092, 0.013111162, 0.037863411, 0.0175452922, 0.1101481095, -0.0125135705, 0.0632491112, 0.0174855348, -0.0191348866, -0.0699421391, 0.1213350222, 0.0483332202, 0.0409469865, -0.027345797, -0.0536876395, 0.0202225037, 0.0377916992, -0.0184536316, 0.1485852003, -0.0354252383, 0.0385805219, 0.0288756322, 0.07367111, 0.0105773732, -0.0021080049, 0.0951844081, 0.0130992103, 0.0169835575, 0.0683166832, 0.0685557202, 0.0367877483, -0.0630578771, 0.035473045, 0.0357837938, 0.0121789193, -0.0192783084, 0.0379829295, 0.005701025, -0.0049151918, -0.0282780398, 0.1332868636, 0.0096212272, -0.0370028801, -0.0464926362, -0.0151429744, 0.0089399721, 0.0177962817, -0.001376702, -0.0331065804, -0.1000129506, 0.0611933917, -0.1164586768, 0.0610499717, -0.0723325014, 0.0073922095, -0.0155971441, -0.0282302331, -0.0531139523, -0.064731136, -0.0238558613, 0.0602372475, -0.0115155922, 0.0897821784, 0.0772088543, -0.0213340241, 0.0025039094, -0.0549784377, 0.0197444297, 0.0037140325, 0.0235451143, -0.0388195589, 0.0296405498, 0.0290907659, 0.1306096464, 0.0902124494, -0.1896995157, 0.0361901559, -0.0255052149, -0.0433134474, -0.006280689, 0.0507235862, -0.0643486753, -0.003319622, 0.0348037407, -0.0134577658, 0.0288278256, -0.0133023914, -0.0583727583, -0.0593289062, 0.0389868841, 0.0058324952, -0.0027160544, 0.0967620537, -0.0555043183, -0.0405406244, 0.0262701325, -0.0276326407, 0.0428831838, 0.0017419799, 0.2552911937, -0.1280280501, 0.1412228793, 0.0457994305, -0.0448432826, 0.0210710838, -0.0495284013, 0.0523968413, -0.0631534904, -0.0119697619, -0.0167206172, 0.0046074321, -0.0570819601, -0.0332739055, -0.0975269675, -0.0103682168, -0.0648267493, 0.0488112904, -0.0171269793, -0.1185621992, -0.093654573, -0.0574644208, -0.0141629241, 0.0690337941, 0.036261864, 0.036596518, 0.0298795868, -0.0385327153, 0.0758702457, 0.0466599613, -0.0283497516, -0.0505801626, 0.0227204375, 0.0959971324, 0.0873440057, -0.0133860549, 0.0703245923 ]
802.2469
Ting Gao
Ting Gao, Feng-Li Yan, and You-Cheng Li
Optimal Controlled teleportation via several kinds of three-qubit states
15 pages
Science in China Series G, 51 (2008) 1529.
10.1007/s11433-008-0165-8
null
quant-ph
http://creativecommons.org/licenses/by/3.0/
The probability of successfully controlled teleportating an unknown qubit using a general three-particle state is investigated. We give the analytic expressions of maximal probabilities of successfully controlled teleportating an unknown qubit via several kinds of tripartite states including a tripartite GHZ state and a tripartite W-state.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 12:44:29 GMT" } ]
"2009-11-13T00:00:00"
[ [ "Gao", "Ting", "" ], [ "Yan", "Feng-Li", "" ], [ "Li", "You-Cheng", "" ] ]
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802.247
Jonathan Butterworth
Jonathan M. Butterworth, Adam R. Davison, Mathieu Rubin, Gavin P. Salam
Jet substructure as a new Higgs search channel at the LHC
4 pages, 3 figures
Phys.Rev.Lett.100:242001,2008
10.1103/PhysRevLett.100.242001
null
hep-ph hep-ex
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
It is widely considered that, for Higgs boson searches at the Large Hadron Collider, WH and ZH production where the Higgs boson decays to b anti-b are poor search channels due to large backgrounds. We show that at high transverse momenta, employing state-of-the-art jet reconstruction and decomposition techniques, these processes can be recovered as promising search channels for the standard model Higgs boson around 120 GeV in mass.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 19:57:19 GMT" }, { "version": "v2", "created": "Thu, 19 Jun 2008 09:05:18 GMT" } ]
"2008-11-26T00:00:00"
[ [ "Butterworth", "Jonathan M.", "" ], [ "Davison", "Adam R.", "" ], [ "Rubin", "Mathieu", "" ], [ "Salam", "Gavin P.", "" ] ]
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802.2471
Xiangcun Meng
X. Meng, X. Chen and Z. Han
The single-degenerate channel for the progenitor of type Ia supernovae with different metallicities
15pages, 12figures, accepted for publication in MNRAS, including referee's comments
null
10.1111/j.1365-2966.2009.14636.x
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The single-degenerate channel for the progenitors of type Ia supernovae (SNe Ia) are currently accepted, in which a carbon-oxygen white dwarf (CO WD) accretes hydrogen-rich material from its companion, increases its mass to the Chandrasekhar mass limit, and then explodes as a SN Ia. Incorporating the prescription of \citet{HAC99a} for the accretion efficiency into Eggleton's stellar evolution code and assuming that the prescription is valid for \emph{all} metallicities, we performed binary stellar evolution calculations for more than 25,000 close WD binaries with metallicities $Z=0.06, 0.05, 0.04, 0.03, 0.02, 0.01, 0.004, 0.001, 0.0003$ and 0.0001. For our calculations, the companions are assumed to be unevolved or slightly evolved stars (WD + MS). As a result, the initial parameter spaces for SNe Ia at various $Z$ are presented in orbital period-secondary mass ($\log P_{\rm i}, M_{\rm 2}^{\rm i}$) planes. Our study shows that both the initial mass of the secondary and the initial orbital period increase with metallicity. Thus, the minimum mass of the CO WD for SNe Ia decreases with metallicity $Z$. The difference of the minimum mass may be as large as 0.24 $M_{\odot}$ for different Z. Adopting the results above, we studied the birth rate of SNe Ia for various $Z$ via a binary population synthesis approach. If a single starburst is assumed, SNe Ia occur systemically earlier and the peak value of the birth rate is larger for a high $Z$. The Galactic birth rate from the WD + MS channel is lower than (but comparable to) that inferred from observations. Our study indicates that supernovae like SN2002ic would not occur in extremely low-metallicity environments, if the delayed dynamical-instability model in \citet{HAN06} is appropriate.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 13:14:04 GMT" }, { "version": "v2", "created": "Fri, 13 Feb 2009 04:31:17 GMT" } ]
"2009-11-13T00:00:00"
[ [ "Meng", "X.", "" ], [ "Chen", "X.", "" ], [ "Han", "Z.", "" ] ]
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802.2472
Mari Carmen Ba\~nuls
Mari-Carmen Ba\~nuls, David P\'erez-Garc\'ia, Michael M. Wolf, Frank Verstraete, J. Ignacio Cirac
Sequentially generated states for the study of two dimensional systems
10 pages, 4 figures
Phys. Rev. A 77, 052306 (2008)
10.1103/PhysRevA.77.052306
null
quant-ph cond-mat.str-el
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Matrix Product States can be defined as the family of quantum states that can be sequentially generated in a one-dimensional system. We introduce a new family of states which extends this definition to two dimensions. Like in Matrix Product States, expectation values of few body observables can be efficiently evaluated and, for the case of translationally invariant systems, the correlation functions decay exponentially with the distance. We show that such states are a subclass of Projected Entangled Pair States and investigate their suitability for approximating the ground states of local Hamiltonians.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 13:07:27 GMT" } ]
"2008-05-08T00:00:00"
[ [ "Bañuls", "Mari-Carmen", "" ], [ "Pérez-García", "David", "" ], [ "Wolf", "Michael M.", "" ], [ "Verstraete", "Frank", "" ], [ "Cirac", "J. Ignacio", "" ] ]
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802.2473
Tetsuya Takimoto
V. Yushankhai, P. Thalmeier, and T. Takimoto
Self-consistent renormalization theory of spin fluctuations in paramagnetic spinel LiV2O4
7 pages, 1 figure. accepted to PRB
null
10.1103/PhysRevB.77.125126
null
cond-mat.str-el
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A phenomenological description for the dynamical spin susceptibility $\chi({\bf q},\omega;T)$ observed in inelastic neutron scattering measurements on powder samples of LiV$_2$O$_4$ is developed in terms of the parametrized self-consistent renormalization (SCR) theory of spin fluctuations. Compatible with previous studies at $T\to 0$, a peculiar distribution in ${\bf q}$-space of strongly enhanced and slow spin fluctuations at $q \sim Q_c \simeq$ 0.6 $\AA^{-1}$ in LiV$_2$O$_4$ is involved to derive the mode-mode coupling term entering the basic equation of the SCR theory. The equation is solved self-consistently with the parameter values found from a fit of theoretical results to experimental data. For low temperatures, $T \lesssim 30$K, where the SCR theory is more reliable, the observed temperature variations of the static spin susceptibility $\chi(Q_c;T)$ and the relaxation rate $\Gamma_Q(T)$ at $q\sim Q_c$ are well reproduced by those suggested by the theory. For $T\gtrsim 30$K, the present SCR is capable in predicting only main trends in $T$-dependences of $\chi(Q_c;T)$ and $\Gamma_Q(T)$. The discussion is focused on a marked evolution (from $q \sim Q_c$ at $T\to 0$ towards low $q$ values at higher temperatures) of the dominant low-$\omega$ integrated neutron scattering intensity $I(q; T)$.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 13:08:38 GMT" } ]
"2009-11-13T00:00:00"
[ [ "Yushankhai", "V.", "" ], [ "Thalmeier", "P.", "" ], [ "Takimoto", "T.", "" ] ]
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802.2474
Yann Rollin
Yann Rollin
A remark on the Herzlich volume of asymptotically complex hyperbolic Einstein manifolds
4 pages, no figure
null
null
null
math.DG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We observe inequalities involving the Herzlich volume of a 4-dimensional asymptotically complex hyperbolic Einstein manifold and its Euler characteristic provided the metrics is either Kaehler or selfdual. In the selfdual case we have to assume furthermore that the Kronheimer-Mrowka invariant is non vanishing.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 14:14:12 GMT" } ]
"2008-02-19T00:00:00"
[ [ "Rollin", "Yann", "" ] ]
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802.2475
Oliver Roth
Oliver Roth, Luis Salinas, Stephan Ruscheweyh
A Note on Generating Functions for Hausdorff Moment Sequences
null
Proc. Amer. Math. Soc. 136, 3171-3176, 2008
null
null
math.CA math.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
For functions $f$ whose Taylor coefficients at the origin form a Hausdorff moment sequence we study the behaviour of $w(y):=|f(\gamma+iy)|$ for $y>0$ ($\gamma\leq1$ fixed).
[ { "version": "v1", "created": "Mon, 18 Feb 2008 13:27:16 GMT" } ]
"2008-05-22T00:00:00"
[ [ "Roth", "Oliver", "" ], [ "Salinas", "Luis", "" ], [ "Ruscheweyh", "Stephan", "" ] ]
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802.2476
Georg B\"ocherer
Georg B\"ocherer and Daniel Bielefeld
Theoretical Analysis of the Energy Capture in Strictly Bandlimited Ultra-Wideband Channels
5 pages. Changes from 2nd version: minor corrections. Essentially the paper to be presented at ISWCS 2008 in Reykjavik
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The frequency selectivity of wireless communication channels can be characterized by the delay spread Ds of the channel impulse response. If the delay spread is small compared to the bandwidth W of the input signal, that is, Ds*W approximately equal to 1, the channel appears to be flat fading. For Ds*W >> 1, the channel appears to be frequency selective, which is usually the case for wideband signals. In the first case, small scale synchronization with a precision much higher than the sampling time T = 1/W is crucial. In this paper, it is shown by analytical means that this is different in the wideband regime. Here synchronization with a precision of T is sufficient and small scale synchronization cannot further increase the captured energy at the receiver. Simulation results show that this effect already occurs for W > 50MHz for the IEEE 802.15.4a channel model.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 13:34:44 GMT" }, { "version": "v2", "created": "Wed, 28 May 2008 09:59:39 GMT" }, { "version": "v3", "created": "Thu, 7 Aug 2008 14:03:44 GMT" } ]
"2008-08-07T00:00:00"
[ [ "Böcherer", "Georg", "" ], [ "Bielefeld", "Daniel", "" ] ]
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802.2477
Maria Madjarska
M.S. Madjarska and J.G. Doyle
Small-scale flows in SUMER and TRACE high-cadence co-observations
7 pages, 6 figures, accepted by A&A
null
10.1051/0004-6361:200809349
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We report on the physical properties of small-scale transient flows observed simultaneously at high cadence with the SUMER spectrometer and the TRACE imager in the plage area of an active region. Our major objective is to provide a better understanding of the nature of transient phenomena in the solar atmosphere by using high-cadence imager and spectrometer co-observations at similar spatial and temporal resolution. A sequence of TRACE Fe IX/X 171 A and high-resolution MDI images were analysed together with simultaneously obtained SUMER observations in spectral lines covering a temperature range from 10 000 K to 1 MK. We reveal the existence of numerous transient flows in small-scale loops (up to 30 Mm) observed in the plage area of an active region. These flows have temperatures from 10 000 K (the low temperature limit of our observations) to 250 000 K. The coronal response of these features is uncertain due to a blending of the observed coronal line Mg X 624.85 A. The duration of the events ranges from 60 s to 19 min depending on the loop size. Some of the flows reach supersonic velocities. The Doppler shifts often associated with explosive events or bi-directional jets can actually be identified with flows (some of them reaching supersonic velocities) in small-scale loops. Additionally, we demonstrate how a line-of-sight effect can give misleading information on the nature of the observed phenomena if only either an imager or a spectrometer is used.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 13:24:02 GMT" } ]
"2009-11-13T00:00:00"
[ [ "Madjarska", "M. S.", "" ], [ "Doyle", "J. G.", "" ] ]
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802.2478
Yves Le Jan
Yves Le Jan (LM-Orsay)
Markov loops and renormalization
null
null
null
null
math.PR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study Poissonian ensembles of Markov loops and the associated renormalized self-intersection local times.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 13:24:56 GMT" }, { "version": "v2", "created": "Thu, 20 Mar 2008 15:22:19 GMT" }, { "version": "v3", "created": "Thu, 31 Jul 2008 12:23:42 GMT" } ]
"2008-07-31T00:00:00"
[ [ "Jan", "Yves Le", "", "LM-Orsay" ] ]
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802.2479
Henri Gouin
Vadim S. Nikolayev, Sergey L. Gavrilyuk, Henri Gouin (MSNMGP, LMMT)
Modelling of the moving deformed triple contact line: influence of the fluid inertia
19 pages and 3 figures
Journal of Colloid and Interface Science 302, 2 (2006) 605-612
10.1016/j.jcis.2006.06.046
null
physics.class-ph math-ph math.MP
null
For partial wetting, motion of the triple liquid-gas-solid contact line is influenced by heterogeneities of the solid surface. This influence can be strong in the case of inertial (e.g. oscillation) flows where the line can be pinned or move intermittently. A model that takes into account both surface defects and fluid inertia is proposed. The viscous dissipation in the bulk of the fluid is assumed to be negligible as compared to the dissipation in the vicinity of the contact line. The equations of motion and the boundary condition at the contact line are derived from Hamilton's principle. The rapid capillary rise along a vertical inhomogeneous wall is treated as an example.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 13:25:49 GMT" } ]
"2008-02-19T00:00:00"
[ [ "Nikolayev", "Vadim S.", "", "MSNMGP, LMMT" ], [ "Gavrilyuk", "Sergey L.", "", "MSNMGP, LMMT" ], [ "Gouin", "Henri", "", "MSNMGP, LMMT" ] ]
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802.248
Maxim M. Korshunov
M.A. Korshunov
Manifestation of Vacancies in a Spectrum of Organic Molecular Crystal Lattice Vibrations
2 pages, PDF
null
null
null
physics.atm-clus physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Using a method Raman of spectroscopy and considering a non-uniformity of allocation of vacancies in a monocrystal, it is shown that lines with the small intensity (caused by presence of vacancies) have a major intensity in the sample of a larger size than in the sample of a smaller size. Increase of an intensity of lines at vacancy concentration increase can reveal which lines are related to presence of vacancies in the sample. For a p-dichlorobenzene, it is lines of a small intensity in a spectrum of the lattice oscillations in the field of 70 cm^{-1}.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 13:40:54 GMT" } ]
"2008-02-19T00:00:00"
[ [ "Korshunov", "M. A.", "" ] ]
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802.2481
Kristina Frantzen
Kristina Frantzen and Alan Huckleberry
K3-surfaces with special symmetry: An example of classification by Mori-reduction
14 pages
null
null
null
math.AG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The classification problem for K3-surfaces equipped with finite groups $H$ of symplectic symmetry centralized by an antisymplectic involution is considered. An approach via equivariant Mori-reduction is employed. This method, which has proved to be successful even for rather small groups, is exemplified here by giving a complete classification in the case $H = C_3 \ltimes C_7$. The consideration of this particular group is related to the study of K3-surfaces with maximal finite groups of symplectic automorphisms. Applications to the case $L_2(7)$ are given.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 20:39:01 GMT" } ]
"2008-02-19T00:00:00"
[ [ "Frantzen", "Kristina", "" ], [ "Huckleberry", "Alan", "" ] ]
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802.2482
Maxim M. Korshunov
M.A. Korshunov
Determination of Vacancies Allocation in a Monocrystal of a P-Dichlorobenzene Using a Method of the Raman Spectroscopy
2 pages, PDF
null
null
null
physics.atm-clus physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The method of Raman scattering is used to investigate the cross edge of a p-dichlorobenzene monocrystal, which was grown up by a Bridgmen method. Comparison of intensities of additional lines of a spectrum of the lattice oscillations of certain parts of an edge of a monocrystal with density of these fields has allowed to relate some lines to presence of vacancies in structure.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 13:44:31 GMT" } ]
"2008-02-19T00:00:00"
[ [ "Korshunov", "M. A.", "" ] ]
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802.2483
Francesco Giazotto
F. Giazotto, T. T. Heikkila, G. Pepe. P. Helisto, A. Luukanen, and J. P. Pekola
Ultrasensitive Proximity Josephson Sensor with Kinetic Inductance Read-Out
4 pages, 3 figures
Appl. Phys. Lett. 92, 162507 (2008)
10.1063/1.2908922
null
cond-mat.mes-hall cond-mat.supr-con
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We propose a mesoscopic kinetic-inductance radiation detector based on a long superconductor--normal metal--superconductor Josephson junction. The operation of this proximity Josephson sensor (PJS) relies on large kinetic inductance variations under irradiation due to the exponential temperature dependence of the critical current. Coupled with a dc SQUID readout, the PJS is able to provide a signal to noise (S/N) ratio up to ~10^3 in the THz regime if operated as calorimeter, while electrical noise equivalent power (NEP) as low as ~7x10^{-20} W(Hz)^(-1/2) at 200 mK can be achieved in the bolometer operation. The high performance together with the ease of fabrication make this structure attractive as an ultrasensitive cryogenic detector of THz electromagnetic radiation.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 13:50:20 GMT" } ]
"2008-07-12T00:00:00"
[ [ "Giazotto", "F.", "" ], [ "Heikkila", "T. T.", "" ], [ "Helisto", "G. Pepe. P.", "" ], [ "Luukanen", "A.", "" ], [ "Pekola", "J. P.", "" ] ]
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802.2484
Manoel Robilotta
M. R. Robilotta
Nuclear Interactions: The Chiral Picture
Talk given at CHIRAL 07 - Osaka - November 2007
Mod.Phys.Lett.A23:2273-2280,2008
10.1142/S0217732308029186
null
nucl-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Chiral expansions of the two-pion exchange components of both two- and three-nucleon forces are reviewed and a discussion is made of the predicted pattern of hierarchies. The strength of the scalar-isoscalar central potential is found to be too large and to defy expectations from the symmetry. The causes of this effect can be understood by studying the nucleon scalar form factor.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 18:49:59 GMT" } ]
"2008-11-26T00:00:00"
[ [ "Robilotta", "M. R.", "" ] ]
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802.2485
Sergei Sergeenkov
Fernando M. Araujo-Moreira and Sergei Sergeenkov
Dynamical reentrance and geometry imposed quantization effects in Nb-AlOx-Nb Josephson junction arrays
null
Superconductor Science and Technology 21 (2008) 045002
10.1088/0953-2048/21/4/045002
null
cond-mat.supr-con
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we report on different phenomena related to the magnetic properties of artificially prepared highly ordered (periodic) two-dimensional Josephson junction arrays (2D-JJA) of both shunted and unshunted Nb-AlOx-Nb tunnel junctions. By employing mutual-inductance measurements and using a high-sensitive bridge, we have thoroughly investigated (both experimentally and theoretically) the temperature and magnetic field dependence of complex AC susceptibility of 2D-JJA. We also demonstrate the use of the scanning SQUID microscope for imaging the local flux distribution within our unshunted arrays.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 13:58:46 GMT" }, { "version": "v2", "created": "Tue, 19 Feb 2008 16:41:38 GMT" } ]
"2008-02-19T00:00:00"
[ [ "Araujo-Moreira", "Fernando M.", "" ], [ "Sergeenkov", "Sergei", "" ] ]
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802.2486
Ivan Garanovich
Alexander Szameit, Ivan L. Garanovich, Matthias Heinrich, Alexander Minovich, Felix Dreisow, Andrey A. Sukhorukov, Thomas Pertsch, Dragomir N. Neshev, Stefan Nolte, Wieslaw Krolikowski, Andreas Tunnermann, Arnan Mitchell and Yuri S. Kivshar
Diffraction-managed solitons and nonlinear beam diffusion in modulated arrays of optical waveguides
null
Phys. Rev. A 78, 031801(1-4) (2008)
10.1103/PhysRevA.78.031801
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study propagation of light in nonlinear diffraction-managed photonic lattices created with arrays of periodically-curved coupled optical waveguides which were fabricated using femtosecond laser writing in silica glass, and titanium indiffusion in LiNbO3 crystals. We identify different regimes of the nonlinear propagation of light beams depending on the input power, and present the first experimental observation of diffraction-managed solitons, which are formed as a result of the interplay between the engineered beam diffraction and nonlinear self-focusing or defocusing. We observe that in self-collimating structures where linear diffraction is suppressed, a novel regime of nonlinear beam diffusion takes place at the intermediate powers before the lattice soliton is formed at higher powers.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 14:01:47 GMT" } ]
"2009-01-21T00:00:00"
[ [ "Szameit", "Alexander", "" ], [ "Garanovich", "Ivan L.", "" ], [ "Heinrich", "Matthias", "" ], [ "Minovich", "Alexander", "" ], [ "Dreisow", "Felix", "" ], [ "Sukhorukov", "Andrey A.", "" ], [ "Pertsch", "Thomas", "" ], [ "Neshev", "Dragomir N.", "" ], [ "Nolte", "Stefan", "" ], [ "Krolikowski", "Wieslaw", "" ], [ "Tunnermann", "Andreas", "" ], [ "Mitchell", "Arnan", "" ], [ "Kivshar", "Yuri S.", "" ] ]
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802.2487
Kazunori Nakayama
Masahiro Kawasaki, Kazunori Nakayama
Solving Cosmological Problems of Supersymmetric Axion Models in an Inflationary Universe
19 pages, 4 figures
Phys.Rev.D77:123524,2008
10.1103/PhysRevD.77.123524
IPMU 08-0025
hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We revisit inflationary cosmology of axion models in the light of recent developments on the inflaton decay in supergravity. We find that all the cosmological difficulties, including gravitino, axino overproduction and axionic isocurvature fluctuation, can be avoided if the saxion field has large initial amplitude during inflation and decays before big-bang nucleosynthesis.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 14:04:36 GMT" }, { "version": "v2", "created": "Mon, 28 Apr 2008 11:19:16 GMT" } ]
"2008-11-26T00:00:00"
[ [ "Kawasaki", "Masahiro", "" ], [ "Nakayama", "Kazunori", "" ] ]
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802.2488
Yves-Patrick Pellegrini
Francois Willot and Yves-Patrick Pellegrini
Fast Fourier Transform computations and build-up of plastic deformation in 2D, elastic-perfectly plastic, pixelwise disordered porous media
6 pages, 5 figures. Presented at the "11th International Symposium On Continuum Models and Discrete Systems (CMDS 11)" (Ecole des Mines, Paris, July 30- August 3 2007)
in D. Jeulin, S. Forest (eds), "Continuum Models and Discrete Systems CMDS 11", (Ecole des Mines, Paris, 2008), pp. 443-449. [ISBN: 978-2-356-71000-0]
null
null
cond-mat.mtrl-sci cond-mat.dis-nn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Stress and strain fields in a two-dimensional pixelwise disordered system are computed by a Fast Fourier Transform method. The system, a model for a ductile damaged medium, consists of an elastic-perfectly matrix containing void pixels. Its behavior is investigated under equibiaxial or shear loading. We monitor the evolution with loading of plastically deformed zones, and we exhibit a nucleation / growth / coalescence scenario of the latter. Identification of plastic ``clusters'' is eased by using a discrete Green function implementing equilibrium and continuity at the level of one pixel. Observed morphological regimes are put into correspondence with some features of the macroscopic stress / strain curves.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 14:13:32 GMT" } ]
"2008-05-29T00:00:00"
[ [ "Willot", "Francois", "" ], [ "Pellegrini", "Yves-Patrick", "" ] ]
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802.2489
Vandana Desai
Vandana Desai, B. T. Soifer, Arjun Dey, Buell T. Jannuzi, Emeric Le Floc'h, Chao Bian, Kate Brand, Michael J. I. Brown, Lee Armus, Dan W. Weedman, Richard Cool, Daniel Stern, Mark Brodwin
Redshift Distribution of Extragalactic 24 micron Sources
21 pages, 11 figures; accepted for publication in ApJ
null
10.1086/587637
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present the redshift distribution of a complete, unbiased sample of 24 micron sources down to fnu(24 micron) = 300 uJy (5-sigma). The sample consists of 591 sources detected in the Bootes field of the NOAO Deep Wide-Field Survey. We have obtained optical spectroscopic redshifts for 421 sources (71%). These have a redshift distribution peaking at z~0.3, with a possible additional peak at z~0.9, and objects detected out to z=4.5. The spectra of the remaining 170 (29%) exhibit no strong emission lines from which to determine a redshift. We develop an algorithm to estimate the redshift distribution of these sources, based on the assumption that they have emission lines but that these lines are not observable due to the limited wavelength coverage of our spectroscopic observations. The redshift distribution derived from all 591 sources exhibits an additional peak of extremely luminous (L(8-1000 micron) > 3 x 10^{12} Lsun) objects at z~2, consisting primarily of sources without observable emission lines. We use optical line diagnostics and IRAC colors to estimate that 55% of the sources within this peak are AGN-dominated. We compare our results to published models of the evolution of infrared luminous galaxies. The models which best reproduce our observations predict a large population of star-formation dominated ULIRGs at z > 1.5 rather than the AGN-dominated sources we observe.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 19:19:05 GMT" } ]
"2009-11-13T00:00:00"
[ [ "Desai", "Vandana", "" ], [ "Soifer", "B. T.", "" ], [ "Dey", "Arjun", "" ], [ "Jannuzi", "Buell T.", "" ], [ "Floc'h", "Emeric Le", "" ], [ "Bian", "Chao", "" ], [ "Brand", "Kate", "" ], [ "Brown", "Michael J. I.", "" ], [ "Armus", "Lee", "" ], [ "Weedman", "Dan W.", "" ], [ "Cool", "Richard", "" ], [ "Stern", "Daniel", "" ], [ "Brodwin", "Mark", "" ] ]
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802.249
Peter Schwab
Stefan Schenk, Michael Dzierzawa, Peter Schwab, Ulrich Eckern
Successes and failures of Bethe Ansatz Density Functional Theory
null
Phys. Rev. B 78, 165102 (2008).
10.1103/PhysRevB.78.165102
null
cond-mat.str-el
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The response of a one-dimensional fermion system is investigated using Density Functional Theory (DFT) within the Local Density Approximation (LDA), and compared with exact results. It is shown that DFT-LDA reproduces surprisingly well some of the characteristic features of the Luttinger liquid, namely the vanishing spectral weight of low energy particle-hole excitations, as well as the dispersion of the collective charge excitations. On the other hand, the approximation fails, even qualitatively, for quantities for which backscattering is important, i.e., those quantities which are crucial for an accurate description of transport. In particular, the Drude weight in the presence of a single impurity is discussed.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 14:16:29 GMT" } ]
"2008-10-30T00:00:00"
[ [ "Schenk", "Stefan", "" ], [ "Dzierzawa", "Michael", "" ], [ "Schwab", "Peter", "" ], [ "Eckern", "Ulrich", "" ] ]
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802.2491
Louigi Addario-Berry
L. Addario-Berry, B.A. Reed
Ballot theorems for random walks with finite variance
21 pages; substantially simplified the proof of the positive result
null
null
null
math.PR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We prove an analogue of the classical ballot theorem that holds for any random walk in the range of attraction of the normal distribution. Our result is best possible: we exhibit examples demonstrating that if any of our hypotheses are removed, our conclusions may no longer hold.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 14:18:13 GMT" }, { "version": "v2", "created": "Thu, 28 Feb 2008 13:30:40 GMT" } ]
"2008-02-28T00:00:00"
[ [ "Addario-Berry", "L.", "" ], [ "Reed", "B. A.", "" ] ]
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802.2492
Jiulin Du
Zhipeng Liu, Jiulin Du, and Lina Guo
Nonextensivity and q-distribution of a relativistic gas under an external electromagnetic field
9 pages, 39 refences
Chinese Sci. Bull.56(2011)3689
10.1007/s11434-011-4750-2
null
cond-mat.stat-mech gr-qc
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We investigate the nonextensivity and the q-distribution of a relativistic gas under an external electromagnetic field. We derive a formula expression of the nonextensive parameter q based on the relativistic generalized Boltzmann equation, the relativistic q-H theorem and the relativistic version of q-power-law distribution function in the nonextensive q-kinetic theory. We thus provide the connection between the parameter 1-q and the differentiation of the temperature field of the gas as well as the four-potential with respect to time and space coordinates, and therefore present the nonextensivity for the gas a clearly physical meaning.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 14:28:19 GMT" } ]
"2015-08-10T00:00:00"
[ [ "Liu", "Zhipeng", "" ], [ "Du", "Jiulin", "" ], [ "Guo", "Lina", "" ] ]
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802.2493
Liliana Micu
P. Dita and L. Micu
Suppressing the spurious states of the centre of mass
4 pages
null
null
null
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Following Dirac's ideas concerning the quantization of constrained systems, we suggest to replace the free centre of mass Hamiltonian H_{CM} by another operator which commutes with all the elements of the algebra generated via the commutation relations by H_{CM} and the constraints which fix the centre of mass position. We show that the new Hamiltonian is a multiple of the identity operator and, as a result, its unique effect is to raise the internal energy levels by a constant amount.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 14:34:16 GMT" } ]
"2008-02-19T00:00:00"
[ [ "Dita", "P.", "" ], [ "Micu", "L.", "" ] ]
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802.2494
Probodh Kuiri Kumar
P. K. Kuiri, B. Joseph, H. P. Lenka, G. Sahu, J. Ghatak, D. Kanjilal, and D. P. Mahapatra
Observation of a Universal Aggregation Mechanism and a Possible Phase Transition in Au Sputtered by Swift Heavy Ions
4 pages, 3 figures
Phys Rev Lett 100, 245501 (2008)
10.1103/PhysRevLett.100.245501
null
cond-mat.mtrl-sci cond-mat.stat-mech
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Two exponents, $\delta$, for size distribution of $n$-atom clusters, $Y(n)\sim n^{-\delta}$, have been found in Au clusters sputtered from embedded Au nanoparticles under swift heavy ion irradiation. For small clusters, below 12.5 nm in size, $\delta$ has been found to be 3/2, which can be rationalized as occurring from a steady state aggregation process with size independent aggregation. For larger clusters, a $\delta$ value of 7/2 is suggested, which might come from a dynamical transition to another steady state where aggregation and evaporation rates are size dependent. In the present case, the observed decay exponents do not support any possibility of a thermodynamic liquid-gas type phase transition taking place, resulting in cluster formation.
[ { "version": "v1", "created": "Sun, 17 Feb 2008 09:26:10 GMT" }, { "version": "v2", "created": "Fri, 16 Oct 2009 07:10:00 GMT" } ]
"2009-10-16T00:00:00"
[ [ "Kuiri", "P. K.", "" ], [ "Joseph", "B.", "" ], [ "Lenka", "H. P.", "" ], [ "Sahu", "G.", "" ], [ "Ghatak", "J.", "" ], [ "Kanjilal", "D.", "" ], [ "Mahapatra", "D. P.", "" ] ]
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802.2495
Pascal Moyal
Pascal Moyal
Construction of a stationary FIFO queue with impatient customers
null
null
null
null
math.PR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we study the stability of queues with impatient customers. Under general stationary ergodic assumptions, we first provide some conditions for such a queue to be regenerative (i.e. to empty a.s. an infinite number of times). In the particular case of a single server operating in First in, First out, we prove the existence (in some cases, on an enlarged probability space) of a stationary workload. This is done by studying stochastic recursions under the Palm settings, and by stochastic comparison of stochastic recursions.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 14:43:43 GMT" } ]
"2008-02-19T00:00:00"
[ [ "Moyal", "Pascal", "" ] ]
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802.2496
Markus Pak
Christof Gattringer and Markus Pak
New overlap construction of Weyl fermions
Abstract extended; Version to appear in Nuclear Physics B
Nucl.Phys.B801:353-360,2008
10.1016/j.nuclphysb.2008.03.015
null
hep-lat hep-ph hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In a recent article Hasenfratz and von Allmen have suggested a fixed point action for two flavors of Weyl fermions on the lattice with gauge group SU(2). The block-spin transformation they use maps the chiral and vector symmetries of the underlying vector theory onto two equations of the Ginsparg-Wilson (GW) type. We show that an overlap Dirac operator can be constructed which solves both GW equations simultaneously. We discuss the properties of this overlap operator and its projection onto lattice Weyl fermions which seems to be free of artefacts, in particular the projection operators are independent of the gauge field.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 14:55:06 GMT" }, { "version": "v2", "created": "Fri, 28 Mar 2008 16:00:53 GMT" } ]
"2008-11-26T00:00:00"
[ [ "Gattringer", "Christof", "" ], [ "Pak", "Markus", "" ] ]
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802.2497
Matthew Palotti
M. L. Palotti, F. Heitsch, E. G. Zweibel, Y.-M. Huang
Evolution of Unmagnetized and Magnetized Shear Layers
17 pages, 14 figures, to be published in ApJ April 20, 2008, v677n2
null
10.1086/529066
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present numerical simulations of the growth and saturation of the Kelvin-Helmholtz instability in a compressible fluid layer with and without a weak magnetic field. In the absence of a magnetic field, the instability generates a single eddy which flattens the velocity profile, stabilizing it against further perturbations. Adding a weak magnetic field - weak in the sense that it has almost no effect on the linear instability - leads to a complex flow morphology driven by MHD forces and to enhanced broadening of the layer, due to Maxwell stresses. We corroborate earlier studies which showed that magnetic fields destroy the large scale eddy structure through periodic cycles of windup and resistive decay, but we show that the rate of decay decreases with decreasing plasma resistivity, at least within the range of resistivity accessible to our simulations. Magnetization increases the efficiency of momentum transport, and the transport increases with decreasing resistivity.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 15:03:58 GMT" } ]
"2009-11-13T00:00:00"
[ [ "Palotti", "M. L.", "" ], [ "Heitsch", "F.", "" ], [ "Zweibel", "E. G.", "" ], [ "Huang", "Y. -M.", "" ] ]
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802.2498
Dominik Muth
D. Muth, A. Mering and M. Fleischhauer
Ultracold bosons in disordered superlattices: Mott-insulators induced by tunneling
null
Phys. Ref. A 77, 043618 (2008)
10.1103/PhysRevA.77.043618
null
cond-mat.other cond-mat.dis-nn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We analyse the phase diagram of ultra-cold bosons in a one-dimensional superlattice potential with disorder using the time evolving block decimation algorithm for infinite sized systems (iTEBD). For degenerate potential energies within the unit cell of the superlattice loophole-shaped insulating phases with non-integer filling emerge with a particle-hole gap proportional to the boson hopping. Adding a small amount of disorder destroys this gap. For not too large disorder the loophole Mott regions detach from the axis of vanishing hopping giving rise to insulating islands. Thus the system shows a transition from a compressible Bose-glass to a Mott-insulating phase with increasing hopping amplitude. We present a straight forward effective model for the dynamics within a unit cell which provides a simple explanation for the emergence of Mott-insulating islands. In particular it gives rather accurate predictions for the inner critical point of the Bose-glass to Mott-insulator transition.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 15:34:29 GMT" } ]
"2010-05-12T00:00:00"
[ [ "Muth", "D.", "" ], [ "Mering", "A.", "" ], [ "Fleischhauer", "M.", "" ] ]
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802.2499
Edward Kinney
HERMES Collaboration: A. Airapetian, et al
Measurement of Azimuthal Asymmetries With Respect To Both Beam Charge and Transverse Target Polarization in Exclusive Electroproduction of Real Photons
24 pages, 10 figures, 2 tables; 1 figure,3 references added, slight text change
JHEP 0806:066,2008
10.1088/1126-6708/2008/06/066
DESY 07-225
hep-ex
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Azimuthal asymmetries in exclusive electroproduction of real photons are measured for the first time with respect to transverse target polarisation, providing new constraints on Generalized Parton Distributions. From the same data set on a hydrogen target, new results for the beam-charge asymmetry are also extracted with better precision than those previously reported. By comparing model calculations with measured asymmetries attributed to the interference between the deeply virtual Compton scattering and Bethe-Heitler processes, a model-dependent constraint is obtained on the total angular momenta carried by up and down quarks in the nucleon.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 15:10:04 GMT" }, { "version": "v2", "created": "Thu, 22 May 2008 18:53:17 GMT" } ]
"2009-03-19T00:00:00"
[ [ "HERMES Collaboration", "", "" ], [ "Airapetian", "A.", "" ] ]
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802.25
Chihiro Sasaki
C. Sasaki (TU Munich), B. Friman (GSI), K. Redlich (Univ. of Wroclaw and TU Darmstadt)
Density fluctuations and a first-order chiral phase transition in non-equilibrium
4 pages, 1 figure, to appear in the proceedings of Chiral07, November 13-16 2007, Osaka, Japan
Mod.Phys.Lett.A23:2469-2472,2008
10.1142/S0217732308029605
null
hep-ph nucl-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The thermodynamics of a first-order chiral phase transition is considered in the presence of spinodal phase separation using the Nambu-Jona-Lasinio model in the mean field approximation. We focus on the behavior of conserved charge fluctuations. We show that in non-equilibrium the specific heat and charge susceptibilities diverge as the system crosses the isothermal spinodal lines.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 15:11:46 GMT" } ]
"2008-11-26T00:00:00"
[ [ "Sasaki", "C.", "", "TU Munich" ], [ "Friman", "B.", "", "GSI" ], [ "Redlich", "K.", "", "Univ. of Wroclaw\n and TU Darmstadt" ] ]
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802.2501
Garrelt Mellema
A. Peplinski (1), P. Artymowicz (2), G. Mellema (1) ((1) Stockholm Observatory, (2) Univ. of Toronto at Scarborough)
Numerical simulations of type III planetary migration: III. Outward migration of massive planets
18 pages, 13 figures, submitted to MNRAS
null
10.1111/j.1365-2966.2008.13339.x
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a numerical study of rapid, so called type III migration for Jupiter-sized planets embedded in a protoplanetary disc. We limit ourselves to the case of outward migration, and study in detail its evolution and physics, concentrating on the structure of the co-rotation and circumplanetary regions, and processes for stopping migration. We also consider the dependence of the migration behaviour on several key parameters. We perform this study using global, two-dimensional hydrodynamical simulations with adaptive mesh refinement. We find that the outward directed type III migration can be started if the initial conditions support $Z > 1$, that corresponds to initial value $M_\rmn{\Delta} \ga 1.5$. Unlike the inward directed migration, in the outward migration the migration rate increases due to the growing of the volume of the co-orbital region. We find the migration to be strongly dependent on the rate of the mass accumulation in the circumplanetary disc, leading to two possible regimes of migration, fast and slow. The structure of the co-orbital region and the stopping mechanism differ between these two regimes.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 15:21:27 GMT" } ]
"2009-11-13T00:00:00"
[ [ "Peplinski", "A.", "" ], [ "Artymowicz", "P.", "" ], [ "Mellema", "G.", "" ] ]
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802.2502
Cecile Monthus
Cecile Monthus and Thomas Garel
Non equilibrium dynamics of disordered systems : understanding the broad continuum of relevant time scales via a strong-disorder RG in configuration space
v2=final version
J. Phys. A: Math. Theor. 41 (2008) 255002
10.1088/1751-8113/41/25/255002
null
cond-mat.dis-nn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We show that an appropriate description of the non-equilibrium dynamics of disordered systems is obtained through a strong disorder renormalization procedure in {\it configuration space}, that we define for any master equation with transitions rates $W ({\cal C} \to {\cal C}')$ between configurations. The idea is to eliminate iteratively the configuration with the highest exit rate $W_{out} ({\cal C})= \sum_{{\cal C}'} W ({\cal C} \to {\cal C}')$ to obtain renormalized transition rates between the remaining configurations. The multiplicative structure of the new generated transition rates suggests that, for a very broad class of disordered systems, the distribution of renormalized exit barriers defined as $B_{out} ({\cal C}) \equiv - \ln W_{out}({\cal C})$ will become broader and broader upon iteration, so that the strong disorder renormalization procedure should become asymptotically exact at large time scales. We have checked numerically this scenario for the non-equilibrium dynamics of a directed polymer in a two dimensional random medium.
[ { "version": "v1", "created": "Mon, 18 Feb 2008 15:14:16 GMT" }, { "version": "v2", "created": "Wed, 8 Oct 2008 13:55:01 GMT" } ]
"2008-10-08T00:00:00"
[ [ "Monthus", "Cecile", "" ], [ "Garel", "Thomas", "" ] ]
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