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801.1673
Andrea Cattaneo
A. Cattaneo, A. Dekel, S.M. Faber, B. Guiderdoni
Downsizing by Shutdown in Red Galaxies
21 pages, 13 figures, submitted to MNRAS
null
10.1111/j.1365-2966.2008.13562.x
null
astro-ph
null
We address the origin of the `downsizing' of elliptical galaxies, according to which the stars in more massive galaxies formed earlier and over a shorter period than those in less massive galaxies. We show that this could be the natural result of a shutdown of star formation in dark matter haloes above a critical mass of 10^12MSun. This is demonstrated using a semianalytic simulation of galaxy formation within the standard hierarchical scenario of structure formation. The assumed threshold mass is motivated by the prediction of stable shock heating above this mass and the finding that such a shutdown reproduces the observed distribution of galaxies in luminosity and colour.The shutdown at a critical halo mass introduces a characteristic stellar mass for the transition of galaxies into the `red sequence' of the galaxy colour-magnitude diagram. Central galaxies of haloes that are more massive today have reached this mass earlier and can therefore grow further along the red sequence by dry mergers, ending up more massive and containing older stars. Small galaxies formed in haloes below the critical mass can shutdown late, when they fall into haloes above the critical mass and become satellites. While our semianalytic simulation that incorporates an explicit shutdown reproduces downsizing as inferred from the stellar ages of ellipticals, we explain why it is much harder to detect downsizing using the mass functions of different galaxy types.
[ { "version": "v1", "created": "Thu, 10 Jan 2008 21:04:23 GMT" } ]
2009-11-13T00:00:00
[ [ "Cattaneo", "A.", "" ], [ "Dekel", "A.", "" ], [ "Faber", "S. M.", "" ], [ "Guiderdoni", "B.", "" ] ]
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801.1674
Ivan Kazachkov
Ivan Kazachkov
A combined space discrete algorithm with a Taylor series by time for CFD
17 pages
null
null
null
math.NA math-ph math.MP
null
The first order by time partial differential equations are used as models in applications such as fluid flow, heat transfer, solid deformation, electromagnetic waves, and others. In this paper we propose the new numerical method to solve a class of initial-boundary value problems for the PDEs using one of the known space discrete numerical schemes and a Taylor series expansion by time. Normally a second order discretization by space is applied while a first order by time is satisfactory. Nevertheless, in a number of different problems, discretization both by temporal and by spatial variables is needed of highest orders, which complicates numerical solution, in some cases dramatically. Therefore it is difficult to apply the same numerical methods for the solution of some PDE arrays if their parameters are varying in a wide range so that in some of them different numerical schemes by time fit the best for precise numerical solution. The Taylor series based solution strategy for the non-stationary PDEs in CFD simulations has been proposed here that attempts to optimise the computation time and fidelity of the numerical solution.
[ { "version": "v1", "created": "Fri, 11 Jan 2008 16:50:37 GMT" } ]
2008-01-14T00:00:00
[ [ "Kazachkov", "Ivan", "" ] ]
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801.1675
Danilo Marchesini
Danilo Marchesini, Pieter van Dokkum (Yale University)
Assessing the Predictive Power of Galaxy Formation Models with the Rest-Frame Optical Luminosity Functions at 2.0<z<3.3
6 pages, 2 figures. To appear in the proceedings of `A Century of Cosmology', S. Servolo, August 2007, to be published in Il Nuovo Cimento
Nuovo Cim.B122:1121-1126,2007
10.1393/ncb/i2008-10452-7
null
astro-ph
null
We compare recently measured rest-frame V-band luminosity functions (LFs) of galaxies at redshifts 2.0<z<3.3 to predictions of semianalytic models by De Lucia & Blaizot and Bower et al. and hydrodynamic simulations by Dave et al. The models succeed for some luminosity and redshift ranges and fail for others. A notable success is that the Bower et al. model provides a good match to the observed LF at z~3. However, all models predict an increase with time of the rest-frame V-band luminosity density, whereas the observations show a decrease. The models also have difficulty matching the observed rest-frame colors of galaxies. In all models the luminosity density of red galaxies increases sharply from z~3 to z~2.2, whereas it is approximately constant in the observations. Conversely, in the models the luminosity density of blue galaxies is approximately constant, whereas it decreases in the observations. These discrepancies cannot be entirely remedied by changing the treatment of dust and suggest that current models do not yet provide an adequate description of galaxy formation and evolution since z~3.
[ { "version": "v1", "created": "Thu, 10 Jan 2008 21:06:40 GMT" } ]
2010-11-11T00:00:00
[ [ "Marchesini", "Danilo", "", "Yale University" ], [ "van Dokkum", "Pieter", "", "Yale University" ] ]
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801.1676
Juan Gerardo Alcazar Arribas
Juan Gerardo Alcazar
Analyzing the Topology Types arising in a Family of Algebraic Curves Depending On Two Parameters
8 pages, 4 figures
null
null
null
cs.SC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Given the implicit equation $F(x,y,t,s)$ of a family of algebraic plane curves depending on the parameters $t,s$, we provide an algorithm for studying the topology types arising in the family. For this purpose, the algorithm computes a finite partition of the parameter space so that the topology type of the family stays invariant over each element of the partition. The ideas contained in the paper can be seen as a generalization of the ideas in \cite{JGRS}, where the problem is solved for families of algebraic curves depending on one parameter, to the two-parameters case.
[ { "version": "v1", "created": "Thu, 10 Jan 2008 21:08:22 GMT" }, { "version": "v2", "created": "Tue, 2 Sep 2008 15:44:23 GMT" } ]
2008-09-02T00:00:00
[ [ "Alcazar", "Juan Gerardo", "" ] ]
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801.1677
Avi Loeb
Abraham Loeb (Harvard), Stuart Wyithe (Melbourne)
Possibility of Precise Measurement of the Cosmological Power Spectrum With a Dedicated 21cm Survey After Reionization
4 pages, 3 figures, Accepted for publication in Physical Review Letters
Phys.Rev.Lett.100:161301,2008
10.1103/PhysRevLett.100.161301
null
astro-ph hep-ph
null
Measurements of the 21cm line emission by residual cosmic hydrogen after reionization can be used to trace the power spectrum of density perturbations through a significant fraction of the observable volume of the Universe. We show that a dedicated 21cm observatory coule probe a number of independent modes that is two orders of magnitude larger than currently available, and enable a cosmic-variance limited detection of the signature of a neutrino mass ~0.05eV. The evolution of the linear growth factor with redshift could also constrain exotic theories of gravity or dark energy to an unprecedented precision.
[ { "version": "v1", "created": "Thu, 10 Jan 2008 21:09:04 GMT" }, { "version": "v2", "created": "Fri, 21 Mar 2008 22:43:07 GMT" } ]
2009-06-23T00:00:00
[ [ "Loeb", "Abraham", "", "Harvard" ], [ "Wyithe", "Stuart", "", "Melbourne" ] ]
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801.1678
Jarle Brinchmann
Jarle Brinchmann (1,4), Max Pettini (2), Stephane Charlot (3) ((1) CAUP Porto, (2) IoA Cambridge, (3) IAP, (4) Leiden)
New insights into the stellar content and physical conditions of star-forming galaxies at z = 2-3 from spectral modelling
14pages, Accepted for MNRAS
null
10.1111/j.1365-2966.2008.12914.x
null
astro-ph
null
We have used extensive libraries of model and empirical galaxy spectra (assembled respectively from the population synthesis code of Bruzual and Charlot and the fourth data release of the Sloan Digital Sky Survey) to interpret some puzzling features seen in the spectra of high redshift star-forming galaxies. We show that a stellar He II 1640 emission line, produced in the expanding atmospheres of Of and Wolf-Rayet stars, should be detectable with an equivalent width of 0.5-1.5AA in the integrated spectra of star-forming galaxies, provided the metallicity is greater than about half solar. Our models reproduce the strength of the He II 1640 line measured in the spectra of Lyman break galaxies for established values of their metallicities. With better empirical calibrations in local galaxies, this spectral feature has the potential of becoming a useful diagnostic of massive star winds at high, as well as low, redshifts. We also uncover a relationship in SDSS galaxies between their location in the [O III]/Hb vs. [N II]/Ha diagnostic diagram (the BPT diagram) and their excess specific star formation rate relative to galaxies of similar mass. We infer that an elevated ionisation parameter U is at the root of this effect, and propose that this is also the cause of the offset of high redshift star-forming galaxies in the BPT diagram compared to local ones. We further speculate that higher electron densities and escape fractions of hydrogen ionising photons may be the factors responsible for the systematically higher values of U in the H II regions of high redshift galaxies. The impact of such differences on abundance determinations from strong nebular lines are considered and found to be relatively minor.
[ { "version": "v1", "created": "Thu, 10 Jan 2008 21:11:54 GMT" } ]
2009-10-08T00:00:00
[ [ "Brinchmann", "Jarle", "" ], [ "Pettini", "Max", "" ], [ "Charlot", "Stephane", "" ] ]
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801.1679
Geraldine Servant
Roberto Contino and Geraldine Servant
Discovering the top partners at the LHC using same-sign dilepton final states
23 pages, 10 figures. v2: typos corrected, a few comments added, conclusions unchanged
JHEP 0806:026,2008
10.1088/1126-6708/2008/06/026
CERN-PH-TH/2007-233, SACLAY-T07/149
hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A natural, non-supersymmetric solution to the hierarchy problem generically requires fermionic partners of the top quark with masses not much heavier than 500 GeV. We study the pair production and detection at the LHC of the top partners with electric charge Q=5/3 (T_{5/3}) and Q=-1/3 (B), that are predicted in models where the Higgs is a pseudo-Goldstone boson. The exotic T_{5/3} fermion, in particular, is the distinct prediction of a LR custodial parity invariance of the electroweak symmetry breaking sector. Both kinds of new fermions decay to Wt, leading to a t\bar{t}WW final state. We focus on the golden channel with two same-sign leptons, and show that a discovery could come with less than 100 pb^{-1} (less than 20 fb^{-1}) of integrated luminosity for masses M=500 GeV (M=1TeV). In the case of the T_{5/3}, we present a simple strategy for its reconstruction in the fully hadronic decay chain. Although no full mass reconstruction is possible for the B, we still find that the same-sign dilepton channel offers the best chances of discovery compared to other previous searches that used final states with one or two opposite-sign leptons, and hence suffered from the large t\bar{t} background. Our analysis also directly applies to the search of 4th generation b' quarks.
[ { "version": "v1", "created": "Fri, 11 Jan 2008 15:53:53 GMT" }, { "version": "v2", "created": "Wed, 3 Mar 2010 16:46:20 GMT" } ]
2010-03-03T00:00:00
[ [ "Contino", "Roberto", "" ], [ "Servant", "Geraldine", "" ] ]
[ 0.0625869781, -0.0381685756, -0.0403812453, -0.0383002795, -0.0722805858, 0.0627450272, -0.0539997071, 0.1212754399, -0.0609538183, -0.0143823614, -0.0357451737, 0.0670123175, -0.07928738, -0.0384056456, 0.0212837867, 0.0844502747, 0.0569499359, 0.0949868038, 0.0125713954, 0.0444114693, 0.0014347788, -0.0124133471, 0.0698045045, 0.0401968546, -0.0267364401, -0.1065769866, 0.0463343821, -0.0717010796, 0.1071564928, 0.0010157872, 0.0539997071, -0.0359032191, -0.1127408519, -0.0810259059, -0.033716891, 0.1356051266, 0.0280008242, 0.0495480262, -0.0631664917, 0.0730181411, -0.0082777599, 0.0306876395, -0.1096852645, -0.0059399679, -0.0164633263, -0.0580562726, 0.0441743955, 0.0401178338, -0.014869676, -0.0609538183, 0.0568445697, 0.0801829845, 0.0113596944, 0.0376680903, -0.0579509065, -0.0881380588, -0.0000498273, 0.0166213736, 0.0293442309, 0.0088704396, -0.0750200823, -0.0607957691, 0.0244842581, 0.0034474204, -0.0036943704, -0.0457285345, -0.0220081732, 0.0036548583, 0.0010808173, 0.018557461, -0.0082382485, 0.0096870204, 0.0695937723, 0.0173852723, 0.0145008974, 0.0529197156, 0.0022900486, 0.0387744233, -0.052050449, -0.036482729, 0.0069804499, -0.0120313987, -0.0485470556, -0.0013681024, -0.0927214473, -0.0273949746, 0.0148433344, -0.001148317, -0.091931209, -0.0415402651, 0.0986745879, -0.0095619, 0.0238257255, -0.016542349, 0.1665825099, -0.1478274912, 0.0993594602, -0.0474670604, -0.0239442606, 0.057055302, 0.0260120556, 0.0287910644, 0.0978316665, -0.0925107226, 0.1333924532, -0.0284749679, 0.0329003111, 0.0004622079, -0.0084950756, 0.0578455403, 0.0321364105, -0.0181360003, -0.1075779572, 0.0280008242, -0.0502065569, -0.0599001646, -0.0086333677, 0.0355080999, 0.0113794506, 0.076073736, 0.0028333385, 0.0178989284, -0.0180833172, 0.002787241, -0.027658388, -0.0756522715, 0.0202037934, -0.1910272539, -0.0114189629, -0.0605323575, 0.0702259615, 0.0386163779, 0.0166477151, 0.0941965654, -0.0348495692, 0.0489158332, 0.0409344137, -0.0758103207, 0.0061243572, -0.0860834345, 0.1126354858, -0.0555275045, 0.0953029022, 0.0602162592, 0.007118742, 0.0637459978, -0.0060716746, 0.0109579898, 0.0386427194, -0.0289227702, -0.0940911993, -0.1479328573, -0.0065622819, 0.0764425173, -0.0848717391, -0.1445611715, -0.0591626056, 0.064325504, -0.0007033956, -0.1003077477, 0.0643781871, 0.0113070123, -0.045991946, 0.0691723078, 0.1244364008, 0.095618993, -0.0452017076, 0.0350602977, -0.1426645964, -0.1078940481, 0.0575294457, 0.0324261673, -0.0825536996, 0.0476514511, -0.0116296932, -0.0157257691, -0.0609011352, -0.0629557595, -0.0699625462, -0.0812366381, 0.0684874356, 0.036482729, 0.0021122447, -0.1132676825, -0.1030472517, 0.0386427194, 0.0083699552, 0.0175960027, 0.0094697047, -0.0454914607, -0.0770220235, 0.1012560353, 0.0984638557, 0.0947233886, 0.0818688273, -0.0129467594, 0.0471246243, 0.1483543217, 0.0301344711, 0.0339012817, -0.0447012223, -0.0086860508, 0.0970414281, -0.1086316109, -0.0622182004, -0.019018434, 0.1013087183, -0.0264071748, -0.0456758514, -0.1275973618, 0.0257486422, -0.0095882406, 0.1077360064, -0.021270616, -0.044885613, 0.0039775395, -0.1066823527, 0.0758103207, 0.0821849257, 0.0917204767, -0.103732124, 0.0831332132, -0.0186628252, 0.0377471149, -0.0140926065, 0.0257881526, 0.0224954877, -0.0339276232, 0.0118272528, 0.076547876, -0.008297516, -0.0649050176, -0.0871897712, 0.0012141702, -0.0214418359, 0.0922473073, 0.0022999267, -0.0249979142, -0.0034968103, -0.0794454217, 0.0288964286, -0.0326632373, 0.0895078108, 0.0189657509, 0.0027296194, -0.0031708365, 0.0017582832, -0.0211784225, 0.0431734249, 0.0481519364, 0.0639567301, 0.0512602106, -0.0373256505, -0.0107933562, 0.0032169339, 0.0385110117 ]
801.168
Patrick Tisserand
P.Tisserand, J.B.Marquette, P.R.Wood, E.Lesquoy, J.P.Beaulieu, A.Milsztajn, C.Hamadache, C.Afonso, J.N.Albert, J.Andersen, R.Ansari, E.Aubourg, P.Bareyre, X.Charlot, C.Coutures, R.Ferlet, P.Fouqu\'e, J.F.Glicenstein, B.Goldman, A.Gould, M.Gros, J.Haissinski, J.de Kat, L.Le Guillou, C.Loup, C.Magneville, E.Maurice, A.Maury, M.Moniez, N.Palanque-Delabrouille, O.Perdereau, Y.Rahal, J.Rich, M.Spiro, A.Vidal-Madjar and S.Zylberajch
R Coronae Borealis stars in the Galactic Bulge discovered by EROS-2
20 pages, 26 figures, Accepted in A&A
null
10.1051/0004-6361:20078814
null
astro-ph
null
Rare types of variable star may give unique insight into short-lived stages of stellar evolution. The systematic monitoring of millions of stars and advanced light curve analysis techniques of microlensing surveys make them ideal for discovering also such rare variable stars. One example is the R Coronae Borealis (RCB) stars, a rare type of evolved carbon-rich supergiant. We have conducted a systematic search of the EROS-2 database for the Galactic catalogue Bulge and spiral arms to find Galactic RCB stars. The light curves of $\sim$100 million stars, monitored for 6.7 years (from July 1996 to February 2003), have been analysed to search for the main signature of RCB stars, large and rapid drops in luminosity. Follow-up spectroscopy has been used to confirm the photometric candidates. We have discovered 14 new RCB stars, all in the direction of the Galactic Bulge, bringing the total number of confirmed Galactic RCB stars to about 51. After reddening correction, the colours and absolute magnitudes of at least 9 of the stars are similar to those of Magellanic RCB stars. This suggests that these stars are in fact located in the Galactic Bulge, making them the first RCB stars discovered in the Bulge. The localisation of the 5 remaining RCBs is more uncertain: 4 are either located behind the Bulge at an estimated maximum distance of 14 kpc or have an unusual thick circumstellar shell; the other is a DY Per RCB which may be located in the Bulge, even if it is fainter than the known Magellanic DY Per. From the small scale height found using the 9 new Bulge RCBs, $61<h^{RCB}_{Bulge}<246$ pc (95% C.L.), we conclude that the RCB stars follow a disk-like distribution inside the Bulge.
[ { "version": "v1", "created": "Fri, 11 Jan 2008 01:20:59 GMT" } ]
2009-11-13T00:00:00
[ [ "Tisserand", "P.", "" ], [ "Marquette", "J. B.", "" ], [ "Wood", "P. R.", "" ], [ "Lesquoy", "E.", "" ], [ "Beaulieu", "J. P.", "" ], [ "Milsztajn", "A.", "" ], [ "Hamadache", "C.", "" ], [ "Afonso", "C.", "" ], [ "Albert", "J. N.", "" ], [ "Andersen", "J.", "" ], [ "Ansari", "R.", "" ], [ "Aubourg", "E.", "" ], [ "Bareyre", "P.", "" ], [ "Charlot", "X.", "" ], [ "Coutures", "C.", "" ], [ "Ferlet", "R.", "" ], [ "Fouqué", "P.", "" ], [ "Glicenstein", "J. F.", "" ], [ "Goldman", "B.", "" ], [ "Gould", "A.", "" ], [ "Gros", "M.", "" ], [ "Haissinski", "J.", "" ], [ "de Kat", "J.", "" ], [ "Guillou", "L. Le", "" ], [ "Loup", "C.", "" ], [ "Magneville", "C.", "" ], [ "Maurice", "E.", "" ], [ "Maury", "A.", "" ], [ "Moniez", "M.", "" ], [ "Palanque-Delabrouille", "N.", "" ], [ "Perdereau", "O.", "" ], [ "Rahal", "Y.", "" ], [ "Rich", "J.", "" ], [ "Spiro", "M.", "" ], [ "Vidal-Madjar", "A.", "" ], [ "Zylberajch", "S.", "" ] ]
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801.1681
Artur Rutkowski
A. Olech, A. Rutkowski, A. Schwarzenberg-Czerny
Curious Variables Experiment (CURVE). Three Periodicities of BF Ara
To appear in Acta Astronomica
null
null
null
astro-ph
null
We report CCD photometry of the dwarf nova BF Ara throughout fifteen consecutive nights in quiescence. Light curve in this interval is dominated by a large amplitude around 0.8 mag modulation consisting two periods. Higher amplitude signal is characterized by period of 0.082159(4) days, which was increasing at the rate of dotP/Psh = 3.8(3)* 10^{-5}. Weaker and stable signal has period of 0.084176(21) days. Knowing the superhump period of BF Ara determined by Kato et al. (2003) and equal to 0.08797(1) days, the first modulation is interpreted as quiescent negative superhump arising from retrograde precesion of titled accretion disk and the latter one as an orbital period of the binary. The respective period excess and defect are epsilon_+ = 4.51% +/- 0.03% and epsilon_- = -2.44% +/- 0.02%. Thus BF Ara is yet another in-the-gap nova with mass ratio q of around 0.21.
[ { "version": "v1", "created": "Thu, 10 Jan 2008 21:19:40 GMT" } ]
2008-01-14T00:00:00
[ [ "Olech", "A.", "" ], [ "Rutkowski", "A.", "" ], [ "Schwarzenberg-Czerny", "A.", "" ] ]
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801.1682
Rongwei Hu
Rongwei Hu, K. Lauritch-Kullas, J. O Brian, V. F. Mitrovic and C. Petrovic
Anisotropy of Electrical Transport and Superconductivity in Metal Chains of Nb2Se3
5 pages, 5 figures
Phys. Rev. B 75, 064517 (2007)
10.1103/PhysRevB.75.064517
null
cond-mat.supr-con cond-mat.mtrl-sci
null
In this work we have shown bulk superconductivity and studied the anisotropy in both the normal and superconducting states in quasi-1D conductor Nb2Se3. Electron - electron Umklapp scattering dominates electronic transport along the direction of Nb metal chains as well as perpendicular to it. The superconducting state is rather anisotropic with possible multi - band features.
[ { "version": "v1", "created": "Fri, 11 Jan 2008 03:23:24 GMT" } ]
2009-11-13T00:00:00
[ [ "Hu", "Rongwei", "" ], [ "Lauritch-Kullas", "K.", "" ], [ "Brian", "J. O", "" ], [ "Mitrovic", "V. F.", "" ], [ "Petrovic", "C.", "" ] ]
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801.1683
Igor Pisnichenko
F. I. Pisnichenko, I. A. Pisnichenko, J. M. Martinez, S. A. Santos
Continuing dynamic assimilation of the inner region data in hydrodynamics modelling: Optimization approach
Paper contents 14 pages and 12 figures. Some results of this work was presented on the sixth international conference on optimization, OPTIMIZATION2007, Porto, Portugal, July 22-25,2007
null
null
null
physics.ao-ph physics.comp-ph
null
In meteorological and oceanological studies the classical approach for finding the numerical solution of the regional model consists in formulating and solving the Cauchy-Dirichlet problem. The related boundary conditions are obtained by linear interpolation of data available on a coarse grid (global data), to the boundary of regional model. Errors, in boundary conditions, appearing owing to linear interpolation may lead to increasing errors in numerical solution during integration. The methods developed to reduce these errors deal with continuous dynamic assimilation of known global data available inside the regional domain. Essentially, this assimilation procedure performs a nudging of large-scale component of regional model solution to large-scale global data component by introducing the relaxation forcing terms into the regional model equations. As a result, the obtained solution is not a valid numerical solution of the original regional model. In this work we propose the optimization approach which is free from the above-mentioned shortcoming. The formulation of the joint problem of finding the regional model solution and data assimilation, as a PDE-constrained optimization problem, gives the possibility to obtain the exact numerical solution of the regional model. Three simple model examples (ODE Burgers equation, Rossby-Oboukhov equation, Korteweg-de Vries equation) were considered in this paper. The result of performed numerical experiments indicates that the optimization approach can significantly improve the precision of the sought numerical solution, even in the cases in which the solution of Cauchy-Dirichlet problem is very sensitive to the errors in the boundary condition.
[ { "version": "v1", "created": "Thu, 10 Jan 2008 22:04:57 GMT" } ]
2008-01-14T00:00:00
[ [ "Pisnichenko", "F. I.", "" ], [ "Pisnichenko", "I. A.", "" ], [ "Martinez", "J. M.", "" ], [ "Santos", "S. A.", "" ] ]
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801.1684
Benjamin Brown
Benjamin P. Brown (1), Matthew K. Browning (2), Allan Sacha Brun (1 and 3), Mark S. Miesch (4), Nicholas J. Nelson (1) and Juri Toomre (1) ((1) JILA and Dept. of Astrophysical and Planetary Sciences, University of Colorado, Boulder, (2) Dept. of Astronomy, University of California, Berkeley, (3) DSM/DAPNIA/SAp, CEA Saclay, Gif sur Yvette, France, (4) High Altitude Observatory, NCAR, Boulder)
Strong Dynamo Action in Rapidly Rotating Suns
8 pages, 4 figs. Published in conference proceedings "Unsolved Problems in Stellar Physics", held July 2-6 2007 Cambridge, England
AIP Conf.Proc.948:271-278,2007
10.1063/1.2818981
null
astro-ph
null
Stellar dynamos are driven by complex couplings between rotation and turbulent convection, which drive global-scale flows and build and rebuild stellar magnetic fields. When stars like our sun are young, they rotate much more rapidly than the current solar rate. Observations generally indicate that more rapid rotation is correlated with stronger magnetic activity and perhaps more effective dynamo action. Here we examine the effects of more rapid rotation on dynamo action in a star like our sun. We find that vigorous dynamo action is realized, with magnetic field generated throughout the bulk of the convection zone. These simulations do not possess a penetrative tachocline of shear where global-scale fields are thought to be organized in our sun, but despite this we find strikingly ordered fields, much like sea-snakes of toroidal field, which are organized on global scales. We believe this to be a novel finding.
[ { "version": "v1", "created": "Thu, 10 Jan 2008 21:29:44 GMT" } ]
2009-06-25T00:00:00
[ [ "Brown", "Benjamin P.", "", "1\n and 3" ], [ "Browning", "Matthew K.", "", "1\n and 3" ], [ "Brun", "Allan Sacha", "", "1\n and 3" ], [ "Miesch", "Mark S.", "" ], [ "Nelson", "Nicholas J.", "" ], [ "Toomre", "Juri", "" ] ]
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801.1685
David Anderson
D. R. Anderson, M. Gillon, C. Hellier, P. F. L. Maxted, F. Pepe, D. Queloz, D. M. Wilson, A. Collier Cameron, B. Smalley, T. A. Lister, S. J. Bentley, A. Blecha, D. J. Christian, B. Enoch, L. Hebb, K. Horne, J. Irwin, Y. C. Joshi, S. R. Kane, M. Marmier, M. Mayor, N. R. Parley, D. L. Pollacco, F. Pont, R. Ryans, D. S\'egransan, I. Skillen, R. A. Street, S. Udry, R. G. West, P. J. Wheatley
WASP-5b: a dense, very-hot Jupiter transiting a 12th-mag Southern-hemisphere star
4 pages, 4 figures, 4 tables, submitted to MNRAS Letters. Corrected vsini value and therefore age estimate. Added reference. Corrected error bars in Fig 4. Changed some wording
null
10.1111/j.1745-3933.2008.00465.x
null
astro-ph
null
We report the discovery of WASP-5b, a Jupiter-mass planet orbiting a 12th-mag G-type star in the Southern hemisphere. The 1.6-d orbital period places WASP-5b in the class of very-hot Jupiters and leads to a predicted equilibrium temperature of 1750 K. WASP-5b is the densest of any known Jovian-mass planet, being a factor seven denser than TrES-4, which is subject to similar stellar insolation, and a factor three denser than WASP-4b, which has a similar orbital period. We present transit photometry and radial-velocity measurements of WASP-5 (= USNO-B1 0487-0799749), from which we derive the mass, radius and density of the planet: M_P = 1.58 +0.13 -0.08 M_J, R_P = 1.090 +0.094 -0.058 R_J and Rho_P = 1.22 +0.19 -0.24 Rho_J. The orbital period is P = 1.6284296 +0.0000048 -0.0000037 d and the mid-transit epoch is T_C (HJD) = 2454375.62466 +0.00026 -0.00025.
[ { "version": "v1", "created": "Thu, 10 Jan 2008 22:00:19 GMT" }, { "version": "v2", "created": "Fri, 22 Feb 2008 01:31:34 GMT" } ]
2009-11-13T00:00:00
[ [ "Anderson", "D. R.", "" ], [ "Gillon", "M.", "" ], [ "Hellier", "C.", "" ], [ "Maxted", "P. F. L.", "" ], [ "Pepe", "F.", "" ], [ "Queloz", "D.", "" ], [ "Wilson", "D. M.", "" ], [ "Cameron", "A. Collier", "" ], [ "Smalley", "B.", "" ], [ "Lister", "T. A.", "" ], [ "Bentley", "S. J.", "" ], [ "Blecha", "A.", "" ], [ "Christian", "D. J.", "" ], [ "Enoch", "B.", "" ], [ "Hebb", "L.", "" ], [ "Horne", "K.", "" ], [ "Irwin", "J.", "" ], [ "Joshi", "Y. C.", "" ], [ "Kane", "S. R.", "" ], [ "Marmier", "M.", "" ], [ "Mayor", "M.", "" ], [ "Parley", "N. R.", "" ], [ "Pollacco", "D. L.", "" ], [ "Pont", "F.", "" ], [ "Ryans", "R.", "" ], [ "Ségransan", "D.", "" ], [ "Skillen", "I.", "" ], [ "Street", "R. A.", "" ], [ "Udry", "S.", "" ], [ "West", "R. G.", "" ], [ "Wheatley", "P. J.", "" ] ]
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801.1686
Arturo Avelino Huerta
Arturo Avelino, U. Nucamendi and F. S. Guzm\'an (Instituto de F\'isica y Matem\'aticas, Universidad Michoacana de San Nicol\'as de Hidalgo, Morelia, Michoac\'an, M\'exico)
Constraining a bulk viscous matter-dominated cosmological model using SNe Ia, CMB and LSS
4 pages, 1 figure. Work presented in the XI Mexican Workshop on Particles and Fields, Tuxtla Gutierrez, Mexico, nov 7-12, 2007. Submitted to AIP Conference Proceedings of this conference
AIP Conf.Proc.1026:300-302,2008
10.1063/1.2965067
null
gr-qc astro-ph
null
We present and constrain a cosmological model which component is a pressureless fluid with bulk viscosity as an explanation for the present accelerated expansion of the universe. We study the particular model of a constant bulk viscosity coefficient \zeta_m. The possible values of \zeta_m are constrained using the cosmological tests of SNe Ia Gold 2006 sample, the CMB shift parameter R from the three-year WMAP observations, the Baryon Acoustic Oscillation (BAO) peak A from the Sloan Digital Sky Survey (SDSS) and the Second Law of Thermodynamics (SLT). It was found that this model is in agreement with the SLT using only the SNe Ia test. However when the model is submitted to the three cosmological tests together (SNe+CMB+BAO) the results are: 1.- the model violates the SLT, 2.- predicts a value of H_0 \approx 53 km sec^{-1} Mpc^{-1} for the Hubble constant, and 3.- we obtain a bad fit to data with a \chi^2_{min} \approx 400 (\chi^2_{d.o.f.} \approx 2.2). These results indicate that this model is ruled out by the observations.
[ { "version": "v1", "created": "Thu, 10 Jan 2008 21:26:07 GMT" } ]
2009-03-24T00:00:00
[ [ "Avelino", "Arturo", "", "Instituto de Física\n y Matemáticas, Universidad Michoacana de San Nicolás de Hidalgo, Morelia,\n Michoacán, México" ], [ "Nucamendi", "U.", "", "Instituto de Física\n y Matemáticas, Universidad Michoacana de San Nicolás de Hidalgo, Morelia,\n Michoacán, México" ], [ "Guzmán", "F. S.", "", "Instituto de Física\n y Matemáticas, Universidad Michoacana de San Nicolás de Hidalgo, Morelia,\n Michoacán, México" ] ]
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801.1687
Jad Saklawi
Paul C. Attie
Synthesis of Large Dynamic Concurrent Programs from Dynamic Specifications
46 pages
null
null
null
cs.LO
null
We present a tractable method for synthesizing arbitrarily large concurrent programs, for a shared memory model with common hardware-available primitives such as atomic registers, compare-and-swap, load-linked/store conditional, etc. The programs we synthesize are dynamic: new processes can be created and added at run-time, and so our programs are not finite-state, in general. Nevertheless, we successfully exploit automatic synthesis and model-checking methods based on propositional temporal logic. Our method is algorithmically efficient, with complexity polynomial in the number of component processes (of the program) that are ``alive'' at any time. Our method does not explicitly construct the automata-theoretic product of all processes that are alive, thereby avoiding \intr{state explosion}. Instead, for each pair of processes which interact, our method constructs an automata-theoretic product (\intr{pair-machine}) which embodies all the possible interactions of these two processes. From each pair-machine, we can synthesize a correct \intr{pair-program} which coordinates the two involved processes as needed. We allow such pair-programs to be added dynamically at run-time. They are then ``composed conjunctively'' with the currently alive pair-programs to re-synthesize the program as it results after addition of the new pair-program. We are thus able to add new behaviors, which result in new properties being satisfied, at run-time. We establish a ``large model'' theorem which shows that the synthesized large program inherits correctness properties from the pair-programs.
[ { "version": "v1", "created": "Thu, 10 Jan 2008 21:27:42 GMT" } ]
2008-01-14T00:00:00
[ [ "Attie", "Paul C.", "" ] ]
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801.1688
Rongwei Hu
Rongwei Hu, R. P. Hermann, F. Grandjean, Y. Lee, J. B. Warren, V. F. Mitrovic and C. Petrovic
Weak Ferromagnetism in Fe1-xCoxSb2
6 pages, 7 figures
Phys. Rev. B 76, 224422 (2007)
10.1103/PhysRevB.76.224422
null
cond-mat.str-el cond-mat.mtrl-sci
null
Weak ferromagnetism in Fe1-xCoxSb2 is studied by magnetization and Mossbauer measurements. A small spontaneous magnetic moment of the order of 10^-3 uB appears along the b-axis for 0.2<= x <= 0.4. Based on the structural analysis, we argue against extrinsic sources of weak ferromagnetism. We discuss our results in the framework of the nearly magnetic electronic structure of the parent compound FeSb2.
[ { "version": "v1", "created": "Fri, 11 Jan 2008 03:26:48 GMT" } ]
2009-11-13T00:00:00
[ [ "Hu", "Rongwei", "" ], [ "Hermann", "R. P.", "" ], [ "Grandjean", "F.", "" ], [ "Lee", "Y.", "" ], [ "Warren", "J. B.", "" ], [ "Mitrovic", "V. F.", "" ], [ "Petrovic", "C.", "" ] ]
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801.1689
Tomasz Kami\'nski
T. Kami\'nski
Extended CO emission in the field of the light echo of V838 Mon
6 pages, 2 figures (+2 figures in an appendix), submitted to A&A. High resolution version of Fig. 1 at http://www.ncac.torun.pl/~tomkam/AAII/Fig1.eps
null
10.1051/0004-6361:20079189
null
astro-ph
null
V838 Mon erupted at the beginning of 2002 becoming an extremely luminous star with L=10^6 L_sun. The outburst was followed by the spectacular light echo that revealed that the star is immersed in a diffuse and dusty medium, plausibly interstellar in nature. Low angular resolution observations in the lowest CO rotational transitions revealed a molecular emission from the direction of V838 Mon. The origin of this CO emission has not been established. In this paper we investigate the idea that the molecular emission originates in the material responsible for the optical light echo. We report on observations of 13 positions within the light echo in the two lowest rotational transitions of CO using the IRAM 30 m telescope. Emission in CO J=1-0 and J=2-1 was detected in three positions. In three other positions only weak J=1-0 lines were found. We conclude that the molecular emission from the direction of V838 Mon is extended and has a complex distribution. We identify the emission as arising from diffuse interstellar clouds and suggest that the CO-bearing gas and the echoing dust are collocated in the same interstellar cloud.
[ { "version": "v1", "created": "Thu, 10 Jan 2008 22:16:29 GMT" } ]
2009-11-13T00:00:00
[ [ "Kamiński", "T.", "" ] ]
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801.169
Kwok Sau Fa
Kwok Sau Fa
Nonlocal description of a falling body through the air
14 pages and 3 figures
null
null
null
physics.gen-ph physics.class-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this present work we consider a falling body through the air under the influence of gravity. In particular, we consider the experimental data based upon the free fall of six men in the atmosphere of the earth. In order to describe this process we employ a nonlocal dissipative force. We show that our description, by using an exponential memory kernel, can fit the experimental data as well as that of a local dissipative force.
[ { "version": "v1", "created": "Thu, 10 Jan 2008 21:54:26 GMT" }, { "version": "v2", "created": "Thu, 2 Oct 2008 22:22:51 GMT" } ]
2008-10-03T00:00:00
[ [ "Fa", "Kwok Sau", "" ] ]
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801.1691
James M. Borger
James Borger
The basic geometry of Witt vectors, I: The affine case
Final version
Algebra & Number Theory 5 (2011), no. 2, pp 231-285
null
null
math.AG math.CT math.NT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We give a concrete description of the category of etale algebras over the ring of Witt vectors of a given finite length with entries in an arbitrary ring. We do this not only for the classical p-typical and big Witt vector functors but also for variants of these functors which are in a certain sense their analogues over arbitrary local and global fields. The basic theory of these generalized Witt vectors is developed from the point of view of commuting Frobenius lifts and their universal properties, which is a new approach even for the classical Witt vectors. The larger purpose of this paper is to provide the affine foundations for the algebraic geometry of generalized Witt schemes and arithmetic jet spaces. So the basics here are developed somewhat fully, with an eye toward future applications.
[ { "version": "v1", "created": "Thu, 10 Jan 2008 21:59:44 GMT" }, { "version": "v2", "created": "Sat, 22 Mar 2008 21:06:10 GMT" }, { "version": "v3", "created": "Tue, 21 Oct 2008 11:01:51 GMT" }, { "version": "v4", "created": "Thu, 18 Jun 2009 12:14:22 GMT" }, { "version": "v5", "created": "Wed, 2 Jun 2010 03:58:10 GMT" }, { "version": "v6", "created": "Mon, 14 Dec 2015 02:02:42 GMT" } ]
2015-12-15T00:00:00
[ [ "Borger", "James", "" ] ]
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801.1692
Michael Eracleous
Toru Misawa, Michael Eracleous, George Chartas, Jane C. Charlton (Penn State)
Exploratory Study of the X-Ray Properties of Quasars With Intrinsic Narrow Absorption Lines
Accepted by the Astrophysical Journal
null
10.1086/529426
null
astro-ph
null
We have used archival Chandra and XMM-Newton observations of quasars hosting intrinsic narrow UV absorption lines (intrinsic NALs) to carry out an exploratory survey of their X-ray properties. Our sample consists of three intrinsic-NAL quasars and one "mini-BAL" quasar, plus four quasars without intrinsic absorption lines for comparison. These were drawn in a systematic manner from an optical/UV-selected sample. The X-ray properties of intrinsic-NAL quasars are indistinguishable from those of "normal" quasars. We do not find any excess absorption in quasars with intrinsic NALs, with upper limits of a few times 10^22 cm^-2. We compare the X-ray and UV properties of our sample quasars by plotting the equivalent width and blueshift velocity of the intrinsic NALs and the X-ray spectral index against the "optical-to-X-ray" slope, alpha-ox. When BAL quasars and other AGNs with intrinsic NALs are included, the plots suggest that intrinsic-NAL quasars form an extension of the BAL sequences and tend to bridge the gap between BAL and "normal" quasars. Observations of larger samples of intrinsic-NAL quasars are needed to verify these conclusions. We also test two competing scenarios for the location of the NAL gas in an accretion-disk wind. Our results strongly support a location of the NAL gas at high latitudes above the disk, closer to the disk axis than the dense BAL wind. We detect excess X-ray absorption only in Q0014+8118, which does not host intrinsic NALs. The absorbing medium very likely corresponds to an intervening system at z=1.1, which also produces strong absorption lines in the rest-frame UV spectrum of this quasar. In the appendix we discuss the connection between UV and X-ray attenuation and its effect on alpha-ox.
[ { "version": "v1", "created": "Thu, 10 Jan 2008 22:22:33 GMT" } ]
2009-11-13T00:00:00
[ [ "Misawa", "Toru", "", "Penn\n State" ], [ "Eracleous", "Michael", "", "Penn\n State" ], [ "Chartas", "George", "", "Penn\n State" ], [ "Charlton", "Jane C.", "", "Penn\n State" ] ]
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801.1693
Christopher Herzog
Sean A. Hartnoll and Christopher P. Herzog
Impure AdS/CFT
26 pages, 11 figures; v2 ref added
Phys.Rev.D77:106009,2008
10.1103/PhysRevD.77.106009
null
hep-th cond-mat.str-el
null
We study momentum relaxation due to dilute, weak impurities in a strongly coupled CFT, a truncation of the M2 brane theory. Using the AdS/CFT correspondence, we compute the relaxation time scale as a function of the background magnetic field B and charge density \rho. The theory admits two different types of impurities. We find that for magnetic impurities, momentum relaxation due to the impurity is suppressed by a background B or \rho. For electric impurities, due to an underlying instability in the theory towards an ordered phase, the inverse relaxation time scale increases dramatically near \sqrt{B^2 + \rho^2/\sigma^2_0} \sim 21 T^2. We compute the Nernst response for the impure theory, and comment on similarities with recent measurements in superconductors.
[ { "version": "v1", "created": "Fri, 11 Jan 2008 16:35:31 GMT" }, { "version": "v2", "created": "Thu, 14 Feb 2008 22:40:49 GMT" } ]
2008-11-26T00:00:00
[ [ "Hartnoll", "Sean A.", "" ], [ "Herzog", "Christopher P.", "" ] ]
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801.1694
Alexander Bolonkin
Alexander Bolonkin
Cheap Method for Shielding a City from Rocket and Nuclear Warhead Impacts
31 pages, 11 figures, 4 tables
null
null
null
physics.gen-ph physics.soc-ph
null
The author suggests a cheap closed AB-Dome which protects the densely populated cities from nuclear, chemical, biological weapon (bombs) delivered by warheads, strategic missiles, rockets, and various incarnations of aviation technology. The offered AB-Dome is also very useful in peacetime because it shields a city from exterior weather and creates a fine climate within the AB-Dome. The hemispherical AB-Dome is the inflatable, thin transparent film, located at altitude up to as much as 15 km, which converts the city into a closed-loop system. The film may be armored the stones which destroy the rockets and nuclear warhead. AB-Dome protects the city in case the World nuclear war and total poisoning the Earth atmosphere by radioactive fallout (gases and dust). Construction of the AB-Dome is easy; the enclosure film is spread upon the ground, the air pump is turned on, and the cover rises to its planned altitude and supported by a small air over-pressure. The offered method is cheaper by thousand times than protection of city by current anti-rocket systems. The AB-Dome may be also used (height up to 15 and more kilometers) for TV, communication, telescope, long distance location, tourism, high placed windmills (energy), illumination and entertainments. The author developed theory of AB-Dome, made estimation, computation and computed a typical project. Discussion and results are in the end of article.
[ { "version": "v1", "created": "Thu, 10 Jan 2008 23:23:53 GMT" } ]
2008-01-14T00:00:00
[ [ "Bolonkin", "Alexander", "" ] ]
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801.1695
Haitao Xu
Alice M. Crawford, Nicolas Mordant, Haitao Xu, and Eberhard Bodenschatz
Fluid Acceleration in the Bulk Turbulence of Dilute Polymer Solutions
5 pages, 4 figures
null
10.1088/1367-2630/10/12/123015
null
physics.flu-dyn
null
We report experimental measurements of Lagrangian accelerations in the bulk of intense turbulent flows of dilute polymer solutions by following tracer particles with a high-speed optical tracking system. We observed a significant decrease in the acceleration variance in dilute polymer solutions. The shape of the normalized acceleration probability density functions, however, remain the same as in Newtonian water flows. We also observed an increase in the turbulent Lagrangian acceleration autocorrelation time in these dilute polymer solutions.
[ { "version": "v1", "created": "Thu, 10 Jan 2008 23:41:40 GMT" } ]
2009-11-13T00:00:00
[ [ "Crawford", "Alice M.", "" ], [ "Mordant", "Nicolas", "" ], [ "Xu", "Haitao", "" ], [ "Bodenschatz", "Eberhard", "" ] ]
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801.1696
Flemming Videb{\ae}k
F.Videbaek (for the BRAHMS collaboration)
Results from pp at 62.4 GeV and 200 GeV with the BRAHMS experiment
8 pages with 5 figures. Proceedings for the 23winter workshop on nuclear dynamics. Big Sky Montana,USA 11-18, 2007
null
null
null
nucl-ex
null
Measurements of elementary pp collisions are an integral component to understand heavy ion collisions. Results for pp collisions at 200 and 62.4 GeV are presented. At both energies NLO pQCD describes pion production well. The measured pion transverse single spin asymmetries are very large at 62.4 GeV and are reasonably well described by models relying on pQCD at transverse momenta larger than 1 GeV/c.
[ { "version": "v1", "created": "Thu, 10 Jan 2008 23:46:48 GMT" } ]
2008-01-14T00:00:00
[ [ "Videbaek", "F.", "", "for the BRAHMS collaboration" ] ]
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801.1697
Scott Bergeson
S. D. Bergeson, J. B. Peatross, N. J. Eyring, J. F. Fralick, D. N. Stevenson, and S. B. Ferguson
Resonance Raman measurements of carotenoids using light emitting diodes
Accepted for publication by the Journal of Biomedical Optics
null
10.1117/1.2952075
null
physics.med-ph physics.optics
null
We report on the development of a compact commercial instrument for measuring carotenoids in skin tissue. The instrument uses two light emitting diodes (LEDs) for dual-wavelength excitation and four photomultiplier tubes for multichannel detection. Bandpass filters are used to select the excitation and detection wavelengths. The f/1.3 optical system has high optical throughput and single photon sensitivity, both of which are crucial in LED-based Raman measurements. We employ a signal processing technique that compensates for detector drift and error. The sensitivity and reproducibility of the LED Raman instrument compares favorably to laser-based Raman spectrometers. This compact, portable instrument is used for non-invasive measurement of carotenoid molecules in human skin with a repeatability better than 10%.
[ { "version": "v1", "created": "Thu, 10 Jan 2008 23:51:52 GMT" }, { "version": "v2", "created": "Fri, 15 Feb 2008 19:54:04 GMT" } ]
2009-11-13T00:00:00
[ [ "Bergeson", "S. D.", "" ], [ "Peatross", "J. B.", "" ], [ "Eyring", "N. J.", "" ], [ "Fralick", "J. F.", "" ], [ "Stevenson", "D. N.", "" ], [ "Ferguson", "S. B.", "" ] ]
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801.1698
Tim Austin
Tim Austin
On exchangeable random variables and the statistics of large graphs and hypergraphs
Published in at http://dx.doi.org/10.1214/08-PS124 the Probability Surveys (http://www.i-journals.org/ps/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Probability Surveys 2008, Vol. 5, 80-145
10.1214/08-PS124
IMS-PS-PS_2008_124
math.PR math.CO
null
De Finetti's classical result of [18] identifying the law of an exchangeable family of random variables as a mixture of i.i.d. laws was extended to structure theorems for more complex notions of exchangeability by Aldous [1,2,3], Hoover [41,42], Kallenberg [44] and Kingman [47]. On the other hand, such exchangeable laws were first related to questions from combinatorics in an independent analysis by Fremlin and Talagrand [29], and again more recently in Tao [62], where they appear as a natural proxy for the `leading order statistics' of colourings of large graphs or hypergraphs. Moreover, this relation appears implicitly in the study of various more bespoke formalisms for handling `limit objects' of sequences of dense graphs or hypergraphs in a number of recent works, including Lov\'{a}sz and Szegedy [52], Borgs, Chayes, Lov\'{a}sz, S\'{o}s, Szegedy and Vesztergombi [17], Elek and Szegedy [24] and Razborov [54,55]. However, the connection between these works and the earlier probabilistic structural results seems to have gone largely unappreciated. In this survey we recall the basic results of the theory of exchangeable laws, and then explain the probabilistic versions of various interesting questions from graph and hypergraph theory that their connection motivates (particularly extremal questions on the testability of properties for graphs and hypergraphs). We also locate the notions of exchangeability of interest to us in the context of other classes of probability measures subject to various symmetries, in particular contrasting the methods employed to analyze exchangeable laws with related structural results in ergodic theory, particular the Furstenberg-Zimmer structure theorem for probability-preserving $\mathbb {Z}$-systems, which underpins Furstenberg's ergodic-theoretic proof of Szemer\'{e}di's Theorem. The forthcoming paper [10]--hereditarytest will make a much more elaborate appeal to the link between exchangeable laws and dense (directed) hypergraphs to establish various results in property testing.
[ { "version": "v1", "created": "Thu, 10 Jan 2008 23:54:17 GMT" }, { "version": "v2", "created": "Tue, 29 Apr 2008 02:14:54 GMT" }, { "version": "v3", "created": "Mon, 26 May 2008 06:08:46 GMT" } ]
2008-05-26T00:00:00
[ [ "Austin", "Tim", "" ] ]
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801.1699
Augusto Alcalde
C. L. Romano, G. E. Marques, L. Sanz, A. M. Alcalde
Phonon modulation of the spin-orbit interaction as a spin relaxation mechanism in quantum dots
null
null
10.1103/PhysRevB.77.033301
null
cond-mat.mes-hall
null
We calculate the spin relaxation rates in a parabolic InSb quantum dots due to the spin interaction with acoustical phonons. We considered the deformation potential mechanism as the dominant electron-phonon coupling in the Pavlov-Firsov spin-phonon Hamiltonian. By studying suitable choices of magnetic field and lateral dot size, we determine regions where the spin relaxation rates can be practically suppressed. We analyze the behavior of the spin relaxation rates as a function of an external magnetic field and mean quantum dot radius. Effects of the spin admixture due to Dresselhaus contribution to spin-orbit interaction are also discussed.
[ { "version": "v1", "created": "Fri, 11 Jan 2008 00:20:06 GMT" } ]
2009-11-13T00:00:00
[ [ "Romano", "C. L.", "" ], [ "Marques", "G. E.", "" ], [ "Sanz", "L.", "" ], [ "Alcalde", "A. M.", "" ] ]
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801.17
C. W. Engelbracht
C. W. Engelbracht, G. H. Rieke, K. D. Gordon, J.-D. T. Smith, M. W. Werner, J. Moustakas, C. N. A. Willmer, and L. Vanzi
Metallicity Effects on Dust Properties in Starbursting Galaxies
34 pages, 11 figures, accepted to ApJ
Astrophys.J.678:804-827,2008
10.1086/529513
null
astro-ph
null
We present infrared observations of 66 starburst galaxies over a wide range of oxygen abundances, to measure how metallicity affects their dust properties. The data include imaging and spectroscopy from the Spitzer Space Telescope, supplemented by groundbased near-infrared imaging. We confirm a strong correlation of aromatic emission with metallicity, with a threshold at a metallicity [12+log(O/H)]~8. The large scatter in both the metallicity and radiation hardness dependence of this behavior implies that it is not due to a single effect, but to some combination. We show that the far-infrared color temperature of the large dust grains increases towards lower metallicity, peaking at a metallicity of 8 before turning over. We compute dust masses and compare them to HI masses from the literature to derive the gas to dust ratio, which increases by nearly 3 orders of magnitude between solar metallicity and a metallicity of 8, below which it flattens out. The abrupt change in aromatic emission at mid-infrared wavelengths thus appears to be reflected in the far-infrared properties, indicating that metallicity changes affect the composition of the full range of dust grain sizes that dominate the infrared emission. In addition, we find that the ratio L(8 micron)/L(TIR), important for calibrating 24 micron measurements of high redshift galaxies, increases slightly as the metallicity decreases from ~solar to ~50% of solar, and then decreases by an order of magnitude with further decreases in metallicity. Although the great majority of galaxies show similar patterns of behavior as described above, there are three exceptions, SBS 0335-052E, Haro 11, and SHOC 391. Their infrared SEDs are dominated energetically by the mid-IR near 24 micron rather than by the 60 - 200 micron region. (Abridged)
[ { "version": "v1", "created": "Fri, 11 Jan 2008 00:24:18 GMT" } ]
2008-12-18T00:00:00
[ [ "Engelbracht", "C. W.", "" ], [ "Rieke", "G. H.", "" ], [ "Gordon", "K. D.", "" ], [ "Smith", "J. -D. T.", "" ], [ "Werner", "M. W.", "" ], [ "Moustakas", "J.", "" ], [ "Willmer", "C. N. A.", "" ], [ "Vanzi", "L.", "" ] ]
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801.1701
Guozhen Lu
Yongsheng Han and Guozhen Lu
Discrete Littlewood-Paley-Stein theory and multi-parameter Hardy spaces associated with flag singular integrals
50 pages
null
null
null
math.CA
null
The main purpose of this paper is to develop a unified approach of multi-parameter Hardy space theory using the discrete Littlewood-Paley-Stein analysis in the setting of implicit multi-parameter structure. It is motivated by the goal to establish and develop the Hardy space theory for the flag singular integral operators studied by Muller-Ricci-Stein and Nagel-Ricci-Stein. This approach enables us to avoid the use of transference method of Coifman-Weiss as often used in the $L^p$ theory for $p>1$ and establish the Hardy spaces $H^p_F$ and its dual spaces associated with the flag singular integral operators for all $0<p\leq 1$. We also prove the boundedness of flag singular integral operators on $BMO_F$ and $H^p_F$, and from $H^p_F$ to $L^p$ for all $0<p\le 1$ without using the deep atomic decomposition. As a result, it bypasses the use of Journe's type covering lemma in this implicit multi-parameter structure. The method used here provides alternate approaches of those developed by Chang, R. Fefferman, Journe and Pipher in the pure product setting. A Calderon-Zygmund decomposition and interpolation theorem are also proved for the implicit multi-parameter Hardy spaces.
[ { "version": "v1", "created": "Fri, 11 Jan 2008 00:54:50 GMT" } ]
2008-01-14T00:00:00
[ [ "Han", "Yongsheng", "" ], [ "Lu", "Guozhen", "" ] ]
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801.1702
Noriaki Kitazawa
Noriaki Kitazawa
Tadpole Resummations in String Theory
14 pages
Phys.Lett.B660:415-421,2008
10.1016/j.physletb.2008.01.028
null
hep-th
null
While R-R tadpoles should be canceled for consistency, string models with broken supersymmetry generally have uncanceled NS-NS tadpoles. Their presence signals that the background does not solve the field equations, so that these models are in "wrong" vacua. In this letter we investigate, with reference to some prototype examples, whether the true values of physical quantities can be recovered resumming the NS-NS tadpoles, hence by an approach that is related to the analysis based on String Field Theory by open-closed duality. We show that, indeed, the positive classical vacuum energy of a Dp-brane of the bosonic string is exactly canceled by the negative contribution arising from tree-level tadpole resummation, in complete agreement with Sen's conjecture on open-string tachyon condensation and with the consequent analysis based on String Field Theory. We also show that the vanishing classical vacuum energy of the SO(8192) unoriented bosonic open-string theory does not receive any tree-level corrections from the tadpole resummation. This result is consistent with the fact that this (unstable) configuration is free from tadpoles of massless closed-string modes, although there is a tadpole of the closed string tachyon. The application of this method to superstring models with broken supersymmetry is also discussed.
[ { "version": "v1", "created": "Fri, 11 Jan 2008 01:08:03 GMT" } ]
2008-11-26T00:00:00
[ [ "Kitazawa", "Noriaki", "" ] ]
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801.1703
Milan Derpich
Milan S. Derpich, Jan Ostergaard and Graham C. Goodwin
The Quadratic Gaussian Rate-Distortion Function for Source Uncorrelated Distortions
Revised version, to be presented at the Data Compression Conference 2008
null
null
null
cs.IT math.IT
null
We characterize the rate-distortion function for zero-mean stationary Gaussian sources under the MSE fidelity criterion and subject to the additional constraint that the distortion is uncorrelated to the input. The solution is given by two equations coupled through a single scalar parameter. This has a structure similar to the well known water-filling solution obtained without the uncorrelated distortion restriction. Our results fully characterize the unique statistics of the optimal distortion. We also show that, for all positive distortions, the minimum achievable rate subject to the uncorrelation constraint is strictly larger than that given by the un-constrained rate-distortion function. This gap increases with the distortion and tends to infinity and zero, respectively, as the distortion tends to zero and infinity.
[ { "version": "v1", "created": "Fri, 11 Jan 2008 01:37:56 GMT" } ]
2008-01-14T00:00:00
[ [ "Derpich", "Milan S.", "" ], [ "Ostergaard", "Jan", "" ], [ "Goodwin", "Graham C.", "" ] ]
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801.1704
Shao-Ming Fei
Zu-Huan Yu, Xian-Qing Li-Jost and Shao-Ming Fei
Representation Class and Geometrical Invariants of Quantum States under Local Unitary Transformations
11 pages
Int. J. Quant. Inform. 5(2007)795-803
10.1142/S0219749907003262
null
quant-ph
null
We investigate the equivalence of bipartite quantum mixed states under local unitary transformations by introducing representation classes from a geometrical approach. It is shown that two bipartite mixed states are equivalent under local unitary transformations if and only if they have the same representation class. Detailed examples are given on calculating representation classes.
[ { "version": "v1", "created": "Fri, 11 Jan 2008 01:27:08 GMT" } ]
2008-01-14T00:00:00
[ [ "Yu", "Zu-Huan", "" ], [ "Li-Jost", "Xian-Qing", "" ], [ "Fei", "Shao-Ming", "" ] ]
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801.1705
Ping Wang
Zhe Chang, Ping Wang, and Ying-Hong Zheng
Ashkin-Teller formalism for elastic response of DNA molecule to external force and torque
5 pages, 7 figures
null
10.1088/0253-6102/49/2/57
null
physics.bio-ph cond-mat.soft
null
We propose an Ashkin-Teller like model for elastic response of DNA molecule to external force and torque. The base-stacking interaction is described in a simple and uniform way. We obtain the phase diagram of dsDNA, and in particular, the transition from B form to the S state induced by stretching and twisting. The elastic response of the ssDNA is presented also in a unified formalism. The close relation of dsDNA molecule structure with elastic response is shown clearly. The calculated folding angle of the dsDNA molecule is $59.2^o$.
[ { "version": "v1", "created": "Fri, 11 Jan 2008 01:35:08 GMT" } ]
2015-05-13T00:00:00
[ [ "Chang", "Zhe", "" ], [ "Wang", "Ping", "" ], [ "Zheng", "Ying-Hong", "" ] ]
[ 0.066206187, 0.0624777637, 0.077018626, 0.0291349851, -0.0300138276, -0.0030343393, -0.0714259893, -0.0547545962, -0.0990696028, -0.083037369, 0.0149270194, 0.0238619242, 0.0249405056, -0.0617320798, 0.0582699701, 0.0798948407, 0.0845287368, 0.0010045111, -0.0278832987, -0.0243945569, -0.0027996483, -0.1266599447, 0.0324373059, 0.0144077027, 0.0516919605, -0.0007294565, 0.0469781645, -0.0287088789, 0.0780306235, -0.0698813498, -0.0835167393, -0.0654605031, 0.0461792164, -0.045513425, -0.0436758436, 0.1192030981, -0.0558731221, 0.1084439307, -0.0339553058, 0.0047437563, 0.0387489982, 0.0492951162, -0.0951813832, 0.1373125911, 0.0401871055, -0.0283892993, -0.0932639092, 0.0554470196, 0.0153264934, -0.0313454084, 0.016431706, 0.0547545962, 0.1443433464, -0.0396811031, -0.1231445745, 0.0591221787, -0.0110454615, 0.0569383875, -0.0251801908, 0.0687628239, 0.0055393754, -0.1618136764, -0.135501653, 0.0671116635, -0.0644485056, -0.0023136213, -0.1450890303, 0.0283094049, 0.0696683004, -0.0142345969, -0.000391984, 0.0278566666, -0.0102798026, 0.0434894226, 0.0073303515, -0.1124919355, -0.0233159773, 0.0655670315, -0.0068110349, 0.0924116969, 0.026391929, -0.0153797567, 0.1043959185, -0.0924649611, -0.0335291997, 0.0485760607, -0.0063349949, -0.0324106738, -0.1296426952, -0.0529170148, -0.0076765623, 0.086020112, -0.0925182253, 0.0797350481, -0.0111719612, 0.0531567, 0.084582001, 0.0425040536, 0.0121706473, -0.075580515, 0.0344346762, -0.0146873342, 0.0860733762, 0.005575994, 0.0570449159, 0.0422377363, -0.0208925009, -0.0241282415, -0.0517452247, 0.0543018579, 0.0723847225, -0.009960223, -0.0592819713, -0.0061119553, -0.0584830232, -0.0950748548, -0.0100867236, -0.0990696028, -0.1102548763, 0.0079162465, -0.0207726583, 0.0133224642, 0.0688693523, -0.0152865462, 0.0260057691, -0.0084821684, 0.0110121723, -0.0943291709, -0.080853574, 0.0025999113, 0.0207460262, -0.0538491197, -0.0425040536, -0.0374973118, -0.0997087583, -0.034780886, 0.0309193023, 0.0547545962, 0.0020972395, 0.008209195, 0.1091896147, -0.0816525221, 0.0490820631, 0.1007207632, 0.093210645, 0.0526506975, -0.0165515468, 0.0299073011, 0.0473776385, 0.0721716732, -0.0409061573, 0.0620516576, 0.1040763408, 0.0708933547, 0.1189900488, -0.1081776097, 0.0688693523, -0.0119642522, 0.0108124344, 0.0663659796, 0.0794687346, 0.0007860487, -0.0408528931, 0.0706802979, 0.0114249615, 0.0641821846, -0.0472444817, -0.0717988312, -0.0526240654, -0.0730238855, 0.0108923297, -0.0229431354, -0.0090214591, 0.044554688, 0.0751544088, -0.0536360666, -0.0225569755, -0.0801611543, -0.0924649611, 0.0250470322, 0.0111719612, -0.0346210971, 0.016817864, -0.0272308234, -0.0632767156, -0.0620516576, 0.0340618342, 0.1233576313, -0.0090747224, -0.0502804853, -0.0076366151, 0.111320138, 0.0533697531, -0.0353934132, -0.0976314917, -0.1433846056, 0.0627973452, 0.0700944066, -0.0141946496, 0.0637028143, 0.0737695694, -0.0256595593, 0.0164583363, -0.0793622062, -0.142958492, 0.0337688848, -0.0362456255, 0.0393881537, -0.0998685509, 0.0225436594, 0.0380299427, 0.0399207883, 0.0698280856, 0.0178698115, -0.0717988312, 0.0052697305, 0.026391929, -0.0561394393, 0.0103796711, 0.1087635085, -0.0686030313, 0.0764327273, 0.0906540081, 0.1027447656, -0.1023186594, -0.049614694, -0.0283892993, -0.0051964936, 0.0372576267, 0.0249671377, 0.0061985077, -0.0116180414, 0.0105860662, 0.0319313034, 0.0172306541, -0.0165249165, -0.0350472033, 0.035340149, -0.0179230757, -0.0982706547, -0.0890028477, -0.003124221, -0.0594417602, 0.0619983934, -0.0342216231, 0.0235556606, -0.0470047966, -0.1267664731, 0.0704672486, 0.0027097666, -0.0478037447, 0.0414121561, 0.0681769252, -0.0352336243, -0.0513723828, -0.0801078901 ]
801.1706
Shao-Ming Fei
Xiao-Hong Wang, Shao-Ming Fei and Ke Wu
A Complete Set of Local Invariants for a Family of Multipartite Mixed States
10 pages
J. Phys. A 41, Math. Theor. (2008) 025305
10.1088/1751-8113/41/2/025305
null
quant-ph
null
We study the equivalence of quantum states under local unitary transformations by using the singular value decomposition. A complete set of invariants under local unitary transformations is presented for several classes of tripartite mixed states in KxMxN composite systems. Two density matrices in the same class are equivalent under local unitary transformations if and only if all these invariants have equal values for these density matrices.
[ { "version": "v1", "created": "Fri, 11 Jan 2008 01:50:16 GMT" } ]
2009-11-13T00:00:00
[ [ "Wang", "Xiao-Hong", "" ], [ "Fei", "Shao-Ming", "" ], [ "Wu", "Ke", "" ] ]
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801.1707
Fabio Governato
F.Governato (UW), L.Mayer (U. of Zurich & ETH), C.Brook (UW)
The Formation of Galaxy Disks
To appear in proceedings of "Formation and Evolution of Galaxy Disks", Rome, October 2007, Eds. J.G. Funes, S.J. and E.M. Corsini. Bigger figures than in printed version
null
null
null
astro-ph
null
We present a new set of multi-million particle SPH simulations of the formation of disk dominated galaxies in a cosmological context. Some of these galaxies are higher resolution versions of the models already described in Governato et al (2007). To correctly compare simulations with observations we create artificial images of our simulations and from them measure photometric Bulge to Disk (B/D) ratios and disk scale lengths. We show how feedback and high force and mass resolution are necessary ingredients to form galaxies that have flatter rotation curves, larger I band disk scale lengths and smaller B/D ratios. A new simulated disk galaxy has an I-band disk scale length of 9.2 kpc and a B/D flux ratio of 0.64 (face on, dust reddened).
[ { "version": "v1", "created": "Fri, 11 Jan 2008 02:04:53 GMT" }, { "version": "v2", "created": "Mon, 14 Jan 2008 17:07:12 GMT" } ]
2008-01-14T00:00:00
[ [ "Governato", "F.", "", "UW" ], [ "Mayer", "L.", "", "U. of Zurich & ETH" ], [ "Brook", "C.", "", "UW" ] ]
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801.1708
Matthew Wood
M. Wood, G. Blaylock, S. M. Bradbury, J. H. Buckley, K. L. Byrum, Y. C. K. Chow, W. Cui, I. de la Calle Perez, A. D. Falcone, S. J. Fegan, J. P. Finley, J. Grube, J. Hall, D. Hanna, J. Holder, D. Horan, T. B. Humensky, D. B. Kieda, J. Kildea, A. Konopelko, H. Krawczynski, F. Krennrich, M. J. Lang, S. LeBohec, T. Nagai, R. A. Ong, J. S. Perkins, M. Pohl, J. Quinn, H. J. Rose, G. H. Sembroski, V. V. Vassiliev, R. G. Wagner, S. P. Wakely, T. C. Weekes, A. Weinstein
A Search for Dark Matter Annihilation with the Whipple 10m Telescope
33 pages, 12 figures, accepted for publication in the Astrophysical Journal
null
10.1086/529421
null
astro-ph
null
We present observations of the dwarf galaxies Draco and Ursa Minor, the local group galaxies M32 and M33, and the globular cluster M15 conducted with the Whipple 10m gamma-ray telescope to search for the gamma-ray signature of self-annihilating weakly interacting massive particles (WIMPs) which may constitute astrophysical dark matter (DM). We review the motivations for selecting these sources based on their unique astrophysical environments and report the results of the data analysis which produced upper limits on excess rate of gamma rays for each source. We consider models for the DM distribution in each source based on the available observational constraints and discuss possible scenarios for the enhancement of the gamma-ray luminosity. Limits on the thermally averaged product of the total self-annihilation cross section and velocity of the WIMP, <\sigma v>, are derived using conservative estimates for the magnitude of the astrophysical contribution to the gamma-ray flux. Although these limits do not constrain predictions from the currently favored theoretical models of supersymmetry (SUSY), future observations with VERITAS will probe a larger region of the WIMP parameter phase space, <\sigma v> and WIMP particle mass (m_\chi).
[ { "version": "v1", "created": "Fri, 11 Jan 2008 02:05:51 GMT" } ]
2009-11-13T00:00:00
[ [ "Wood", "M.", "" ], [ "Blaylock", "G.", "" ], [ "Bradbury", "S. M.", "" ], [ "Buckley", "J. H.", "" ], [ "Byrum", "K. L.", "" ], [ "Chow", "Y. C. K.", "" ], [ "Cui", "W.", "" ], [ "Perez", "I. de la Calle", "" ], [ "Falcone", "A. D.", "" ], [ "Fegan", "S. J.", "" ], [ "Finley", "J. P.", "" ], [ "Grube", "J.", "" ], [ "Hall", "J.", "" ], [ "Hanna", "D.", "" ], [ "Holder", "J.", "" ], [ "Horan", "D.", "" ], [ "Humensky", "T. B.", "" ], [ "Kieda", "D. B.", "" ], [ "Kildea", "J.", "" ], [ "Konopelko", "A.", "" ], [ "Krawczynski", "H.", "" ], [ "Krennrich", "F.", "" ], [ "Lang", "M. J.", "" ], [ "LeBohec", "S.", "" ], [ "Nagai", "T.", "" ], [ "Ong", "R. A.", "" ], [ "Perkins", "J. S.", "" ], [ "Pohl", "M.", "" ], [ "Quinn", "J.", "" ], [ "Rose", "H. J.", "" ], [ "Sembroski", "G. H.", "" ], [ "Vassiliev", "V. V.", "" ], [ "Wagner", "R. G.", "" ], [ "Wakely", "S. P.", "" ], [ "Weekes", "T. C.", "" ], [ "Weinstein", "A.", "" ] ]
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801.1709
Igor Rodnianski
S. Klainerman, I. Rodnianski
On the breakdown criterion in General Relativity
null
null
null
null
math.AP gr-qc
null
We give a geometric criterion for the breakdown of an Einstein vacuum space-time foliated by a constant mean curvature, or maximal, foliation. More precisely we show that the foliated space-time can be extended as long as the the second fundamental form and the first derivatives of the logarithm of the lapse of the foliation remain uniformly bounded. No restrictions on the size of the initial data are made.
[ { "version": "v1", "created": "Fri, 11 Jan 2008 02:10:10 GMT" } ]
2008-01-28T00:00:00
[ [ "Klainerman", "S.", "" ], [ "Rodnianski", "I.", "" ] ]
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801.171
Zhi-Qiang Jiang
Zhi-Qiang Jiang, Wei-Xing Zhou (ECUST)
Multifractal analysis of Chinese stock volatilities based on partition function approach
14 elsart pages including 4 eps figures
Physica A 387 (19), 4881-4888 (2008)
10.1016/j.physa.2008.04.028
null
q-fin.ST physics.soc-ph
null
We have performed detailed multifractal analysis on the minutely volatility of two indexes and 1139 stocks in the Chinese stock markets based on the partition function approach. The partition function $\chi_q(s)$ scales as a power law with respect to box size $s$. The scaling exponents $\tau(q)$ form a nonlinear function of $q$. Statistical tests based on bootstrapping show that the extracted multifractal nature is significant at the 1% significance level. The individual securities can be well modeled by the $p$-model in turbulence with $p = 0.40 \pm 0.02$. Based on the idea of ensemble averaging (including quenched and annealed average), we treat each stock exchange as a whole and confirm the existence of multifractal nature in the Chinese stock markets.
[ { "version": "v1", "created": "Fri, 11 Jan 2008 02:28:41 GMT" }, { "version": "v2", "created": "Mon, 18 Feb 2008 01:32:37 GMT" } ]
2008-12-02T00:00:00
[ [ "Jiang", "Zhi-Qiang", "", "ECUST" ], [ "Zhou", "Wei-Xing", "", "ECUST" ] ]
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801.1711
Robert Bluhm
Robert Bluhm
Nambu-Goldstone and Massive Modes in Gravitational Theories with Spontaneous Lorentz Breaking
Talk presented at the Fourth Meeting on CPT and Lorentz Symmetry, Bloomington, IN, August, 2007; 7 pages. Typos corrected
null
10.1142/9789812779519_0020
null
gr-qc
null
Spontaneous breaking of local Lorentz symmetry is of interest as a possible mechanism originating from physics at the Planck scale. If such breaking occurs, however, it raises the questions of what the fate of the Nambu-Goldstone modes is, whether a Higgs mechanism can occur, and whether additional massive modes (analogous to the Higgs particle) can appear. A summary of some recent work looking at these questions is presented here.
[ { "version": "v1", "created": "Fri, 11 Jan 2008 02:40:18 GMT" }, { "version": "v2", "created": "Thu, 17 Apr 2008 18:05:20 GMT" } ]
2016-11-09T00:00:00
[ [ "Bluhm", "Robert", "" ] ]
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801.1712
Steven Morrison
Steven K. Morrison and Yuri S. Kivshar
Observation of Enhanced Beaming from Photonic Crystal Waveguides
4 pages, 6 figures
null
10.1007/s00340-008-3305-y
null
physics.optics physics.gen-ph
null
We report on the experimental observation of the beaming effect in photonic crystals enhanced via surface modes. We experimentally map the spatial field distribution of energy emitted from a subwavelength photonic crystal waveguide into free-space, rendering with crisp clarity the diffractionless beaming of energy. Our experimental data agree well with our numerical studies of the beaming enhancement in photonic crystals with modulated surfaces. Without loss of generality, we study the beaming effect in a photonic crystal scaled to microwave frequencies and demonstrate the technological capacity to deliver long-range, wavelength-scaled beaming of energy.
[ { "version": "v1", "created": "Fri, 11 Jan 2008 02:43:01 GMT" } ]
2009-11-13T00:00:00
[ [ "Morrison", "Steven K.", "" ], [ "Kivshar", "Yuri S.", "" ] ]
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801.1713
Satoru Morita
Satoru Morita
Extended Pair Approximation of Evolutionary Game on Complex Networks
to be published in Progress of Theoretical Physics
Progress of Theoretical Physics 119, 29-38 (2008)
10.1143/PTP.119.29
null
physics.soc-ph physics.comp-ph
null
We investigate how network structure influences evolutionary games on networks. We extend the pair approximation to study the effects of degree fluctuation and clustering of the network. We find that a larger fluctuation of the degree is equivalent to a larger mobility of the players. In addition, a larger clustering coefficient is equivalent to a smaller number of neighbors.
[ { "version": "v1", "created": "Fri, 11 Jan 2008 02:50:55 GMT" } ]
2015-11-12T00:00:00
[ [ "Morita", "Satoru", "" ] ]
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801.1714
Christoph Freysoldt
Christoph Freysoldt, Philipp Eggert, Patrick Rinke, Arno Schindlmayr, Matthias Scheffler
Screening in 2D: GW calculations for surfaces and thin films using the repeated-slab approach
11 pages, 10 figures, PRB accepted
Phys. Rev. B 77, 235428 (2008)
10.1103/PhysRevB.77.235428
null
cond-mat.mtrl-sci
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In the context of photoelectron spectroscopy, the $GW$ approach has developed into the method of choice for computing excitation spectra of weakly correlated bulk systems and their surfaces. To employ the established computational schemes that have been developed for three-dimensional crystals, two-dimensional systems are typically treated in the repeated-slab approach. In this work we critically examine this approach and identify three important aspects for which the treatment of long-range screening in two dimensions differs from the bulk: (1) anisotropy of the macroscopic screening (2) $\mathbf k$-point sampling parallel to the surface (3) periodic repetition and slab-slab interaction. For prototypical semiconductor (silicon) and ionic (NaCl) thin films we quantify the individual contributions of points (1) to (3) and develop robust and efficient correction schemes derived from the classic theory of dielectric screening.
[ { "version": "v1", "created": "Fri, 11 Jan 2008 15:21:42 GMT" }, { "version": "v2", "created": "Wed, 11 Jun 2008 21:47:45 GMT" } ]
2008-06-20T00:00:00
[ [ "Freysoldt", "Christoph", "" ], [ "Eggert", "Philipp", "" ], [ "Rinke", "Patrick", "" ], [ "Schindlmayr", "Arno", "" ], [ "Scheffler", "Matthias", "" ] ]
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801.1715
Srivatsava Ranjit Ganta
Srivatsava Ranjit Ganta, Raj Acharya
On Breaching Enterprise Data Privacy Through Adversarial Information Fusion
null
null
null
null
cs.DB cs.CR cs.OH
null
Data privacy is one of the key challenges faced by enterprises today. Anonymization techniques address this problem by sanitizing sensitive data such that individual privacy is preserved while allowing enterprises to maintain and share sensitive data. However, existing work on this problem make inherent assumptions about the data that are impractical in day-to-day enterprise data management scenarios. Further, application of existing anonymization schemes on enterprise data could lead to adversarial attacks in which an intruder could use information fusion techniques to inflict a privacy breach. In this paper, we shed light on the shortcomings of current anonymization schemes in the context of enterprise data. We define and experimentally demonstrate Web-based Information- Fusion Attack on anonymized enterprise data. We formulate the problem of Fusion Resilient Enterprise Data Anonymization and propose a prototype solution to address this problem.
[ { "version": "v1", "created": "Fri, 11 Jan 2008 03:21:49 GMT" }, { "version": "v2", "created": "Fri, 8 Feb 2008 21:58:35 GMT" } ]
2008-02-08T00:00:00
[ [ "Ganta", "Srivatsava Ranjit", "" ], [ "Acharya", "Raj", "" ] ]
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801.1716
Oscar Iglesias
Oscar Iglesias, Xavier Batlle and Amilcar Labarta
Particle size and cooling field dependence of exchange bias in core/shell magnetic nanoparticles
Submitted to J. Phys. D (10 pages, 10 figures)
J. Phys. D 41, 134010 (2008)
10.1088/0022-3727/41/13/134010
null
cond-mat.mtrl-sci
null
We present a numerical simulation study of the exchange bias (EB) effect in nanoparticles with core/shell structure aimed to unveil the microscopic origin of some of the experimental phenomenology associated to this effect. In particular, we have focused our study on the particle size and field cooling dependence of the hysteresis loop shifts. To this end, hysteresis loops after a field cooling process have been computed by means of Monte Carlo simulations based on a model that takes into account the peculiar properties of the core, shell and interfacial regions of the particle and the EB and coercive fields have been extracted from them. The results show that, as a general trend, the EB field $h_{EB}$ decreases with increasing particle size, in agreement with some experimental observations. However, closer inspection reveals notable oscillations of $h_{EB}$ as a function of the particle radius which we show to be closely related to the net magnetization established after field cooling at the interfacial shell spins. For a particle with ferromagnetic interface coupling, we show that the magnitude and sign of $h_{EB}$ can be varied with the magnetic field applied during the cooling process.
[ { "version": "v1", "created": "Fri, 11 Jan 2008 15:09:02 GMT" } ]
2008-06-20T00:00:00
[ [ "Iglesias", "Oscar", "" ], [ "Batlle", "Xavier", "" ], [ "Labarta", "Amilcar", "" ] ]
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801.1717
Vesko Valov
S. Nedev, J. Pelant and V. Valov
A non-separable Christensen's theorem and set tri-quotient maps
11 pages
null
null
null
math.GN
null
For every space $X$ let $\mathcal K(X)$ be the set of all compact subsets of $X$. Christensen \cite{c:74} proved that if $X, Y$ are separable metrizable spaces and $F\colon\mathcal{K}(X)\to\mathcal{K}(Y)$ is a monotone map such that any $L\in\mathcal{K}(Y)$ is covered by $F(K)$ for some $K\in\mathcal{K}(X)$, then $Y$ is complete provided $X$ is complete. It is well known \cite{bgp} that this result is not true for non-separable spaces. In this paper we discuss some additional properties of $F$ which guarantee the validity of Christensen's result for more general spaces.
[ { "version": "v1", "created": "Fri, 11 Jan 2008 04:06:39 GMT" }, { "version": "v2", "created": "Sat, 19 Jan 2008 06:44:13 GMT" } ]
2008-01-21T00:00:00
[ [ "Nedev", "S.", "" ], [ "Pelant", "J.", "" ], [ "Valov", "V.", "" ] ]
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801.1718
Milan Derpich
Milan S. Derpich, Jan Ostergaard and Daniel E. Quevedo
Achieving the Quadratic Gaussian Rate-Distortion Function for Source Uncorrelated Distortions
Technical report, January 2008. Other papers available from http://msderpich.no-ip.org
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We prove achievability of the recently characterized quadratic Gaussian rate-distortion function (RDF) subject to the constraint that the distortion is uncorrelated to the source. This result is based on shaped dithered lattice quantization in the limit as the lattice dimension tends to infinity and holds for all positive distortions. It turns out that this uncorrelated distortion RDF can be realized causally. This feature, which stands in contrast to Shannon's RDF, is illustrated by causal transform coding. Moreover, we prove that by using feedback noise shaping the uncorrelated distortion RDF can be achieved causally and with memoryless entropy coding. Whilst achievability relies upon infinite dimensional quantizers, we prove that the rate loss incurred in the finite dimensional case can be upper-bounded by the space filling loss of the quantizer and, thus, is at most 0.254 bit/dimension.
[ { "version": "v1", "created": "Fri, 11 Jan 2008 04:08:07 GMT" }, { "version": "v2", "created": "Sun, 13 Jan 2008 04:48:14 GMT" }, { "version": "v3", "created": "Thu, 24 Jul 2008 10:02:42 GMT" } ]
2008-07-24T00:00:00
[ [ "Derpich", "Milan S.", "" ], [ "Ostergaard", "Jan", "" ], [ "Quevedo", "Daniel E.", "" ] ]
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801.1719
Geoff Willmott
Geoff Willmott
Dynamics of a sphere with inhomogeneous slip boundary conditions in Stokes flow
13 Pages, 2 figures
null
10.1103/PhysRevE.77.055302
null
physics.flu-dyn
null
The dynamic resistance of a sphere with a general inhomogeneous slip boundary condition is analysed in Newtonian unbounded uniform flow at low Reynolds number. The boundary condition is treated as a perturbation to a homogeneous sphere, assuming that the slip length magnitude b is much smaller than the sphere radius a. To first order, the effect of inhomogeneous slip is the same as that of a radial deformity of magnitude b. Full resistance tensors are presented and the dynamics of a hemispherical inhomogeneous sphere, such as a Janus particle, are explicitly calculated.
[ { "version": "v1", "created": "Fri, 11 Jan 2008 04:10:48 GMT" } ]
2009-11-13T00:00:00
[ [ "Willmott", "Geoff", "" ] ]
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801.172
Brudnyi Alexander
Alexander Brudnyi
Extension of Matrices with Entries in H^{\infty} on Coverings of Riemann Surfaces of Finite Type
12 pages
null
null
null
math.CV math.FA
null
In the present paper continuing our previous work we prove an extension theorem for matrices with entries in the algebra of bounded holomorphic functions defined on an unbranched covering of a Caratheodory hyperbolic Riemann surface of finite type.
[ { "version": "v1", "created": "Fri, 11 Jan 2008 04:19:22 GMT" } ]
2008-01-14T00:00:00
[ [ "Brudnyi", "Alexander", "" ] ]
[ -0.0428230129, -0.018356014, 0.0645688921, 0.0505482182, 0.020754287, -0.0423618071, -0.0184136648, -0.0604641549, -0.0709335431, 0.0411396101, -0.0024616891, -0.0664137155, 0.018897932, 0.0718559548, 0.044806201, 0.0944550633, 0.0264501851, -0.0161768142, 0.1078300476, 0.0888744667, -0.0447139591, -0.160961017, 0.0007739619, 0.0617555343, 0.0659986287, 0.0098640509, 0.0045284699, 0.0976835117, 0.1222196892, -0.0088666929, 0.1038636789, -0.0267499704, 0.036942631, 0.0132250926, -0.0608331189, 0.067520611, 0.0276723821, 0.1000817865, -0.0134095754, 0.1165929735, -0.0239135511, 0.0958386809, -0.041646935, -0.0250435062, 0.0143550485, 0.1206515878, 0.0561288148, -0.0196704511, 0.0694115609, 0.0643844083, -0.0786818042, 0.0332760401, -0.032007724, -0.1257248521, -0.0118414741, 0.0567283854, -0.0426154695, 0.0563132986, -0.0104693845, -0.1668644696, 0.0078750988, -0.0245361794, -0.0262887627, -0.0029459556, -0.1360558867, 0.0224146303, -0.1121653914, 0.0238674302, 0.0320538431, 0.0648917332, -0.1109662503, -0.0374038368, -0.0087168003, 0.0553447641, 0.0579736419, -0.0317309983, 0.0066586672, 0.0498564094, -0.0479654633, 0.017179938, 0.0390872397, 0.0481038243, 0.0071198735, 0.0656296685, -0.0001213369, 0.0065260702, 0.0563132986, 0.0049377908, -0.1125343516, -0.0212270226, 0.069180958, 0.0401710756, 0.040793702, 0.0214922167, 0.1021110937, -0.0591727793, -0.0072640004, -0.0308777671, -0.0373577178, -0.0090569397, 0.0175604336, 0.0348210819, 0.0972223058, -0.0412318483, 0.1728601456, 0.0703339726, 0.0238904897, 0.0130867306, -0.0421773233, -0.0448292606, -0.0266116075, -0.0702878535, 0.0155080641, -0.0725016445, 0.0784512013, -0.0208119377, -0.0304165594, -0.0753149986, -0.0880904198, -0.0024155683, 0.0632313937, -0.0089589339, 0.064246051, 0.0293788463, 0.0630469099, -0.0023939493, 0.0222762674, -0.0173759498, -0.1335653663, -0.0224376898, 0.0365736671, -0.0145280007, 0.0369656906, -0.0893356726, -0.0882749036, 0.0352361687, 0.1018343642, 0.0061052195, 0.0963921323, -0.0852770582, 0.0319846608, 0.0258967374, 0.0847236142, 0.0409551263, -0.0346135385, 0.0067970287, -0.0544223525, 0.0806649923, 0.0588499345, -0.0136978291, -0.0749460384, 0.0479654633, 0.0473197736, 0.0904886872, -0.0162344649, -0.0741158649, -0.0449215025, 0.0681201816, -0.0481960662, 0.0224492196, 0.0371501744, 0.1343955398, 0.0207658168, 0.0049032001, 0.1069076359, -0.0643844083, -0.0126255248, 0.0008099937, -0.009541207, -0.0849080905, -0.0325611718, -0.1283076108, -0.0903503299, 0.0618016534, 0.0789585337, 0.11991366, -0.0754072443, -0.1149326265, -0.0810800791, 0.0044708191, 0.0033523939, 0.1095826328, 0.003006489, -0.0167533215, 0.0275570806, 0.0507788211, 0.0622167401, -0.0100485338, 0.0882287771, 0.0056526605, -0.0382801294, -0.0355359502, 0.120743826, 0.1099516004, 0.0313850939, -0.1103205681, -0.0077943876, -0.027764624, -0.0474120155, 0.0468585677, 0.0888744667, -0.0438837856, 0.0667826831, 0.087952055, -0.0129944896, 0.0679356977, -0.0193591379, 0.0711641461, -0.0734701753, -0.0855537802, -0.0139514925, -0.0386490934, -0.0116742859, 0.0596339852, -0.0135018164, 0.0541917495, 0.0303704403, -0.017410541, 0.0208234675, 0.1750739366, -0.048518911, 0.0472736545, 0.0261504017, 0.0152544007, 0.0235445853, -0.0198549349, -0.0116915815, -0.0057362542, 0.0264271256, 0.0287331566, 0.1354101896, -0.0261734612, -0.1044171229, -0.1083834991, 0.0140552642, 0.0002286214, -0.0127754165, -0.0905348137, -0.0327687114, -0.0366889685, 0.0613404475, 0.1414058805, 0.0947317928, 0.0016934922, 0.0075522545, 0.008728331, -0.0075810798, 0.0062781717, -0.0029603685, -0.0737007782, -0.0375421979, 0.0471814126, 0.0180677604, -0.064522773, -0.0748076737, 0.0395484455 ]
801.1721
Vesko Valov
V. Valov
Probability measures and Milyutin maps between metric spaces
14 pages
null
null
null
math.GN math.FA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We prove that the functor $\Hat{P}$ of Radon probability measures transforms any open map between completely metrizable spaces into a soft map. This result is applied to establish some properties of Milyutin maps between completely metrizable spaces.
[ { "version": "v1", "created": "Fri, 11 Jan 2008 04:48:47 GMT" }, { "version": "v2", "created": "Wed, 23 Jul 2008 21:18:18 GMT" } ]
2008-07-24T00:00:00
[ [ "Valov", "V.", "" ] ]
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801.1722
Seong Chan Park
Seong Chan Park and Satoshi Yamaguchi
Inflation by non-minimal coupling
9 pages, 1 figure
JCAP0808:009,2008
10.1088/1475-7516/2008/08/009
SNUTP 07-016
hep-ph astro-ph gr-qc hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Inflationary scenarios based on simple non-minimal coupling and its generalizations are studied. Generalizing the form of non-minimal coupling to "K(phi)R" with an arbitrary function K(phi), we show that the flat potential still is obtainable when V(phi)/K^2(phi) is asymptotically constant. Very interestingly, if the ratio of the dimensionless self-coupling constant of the inflaton field and the non-minimal coupling constant is small the cosmological observables for general monomial cases are in good agreement with recent observational data.
[ { "version": "v1", "created": "Fri, 11 Jan 2008 05:41:38 GMT" }, { "version": "v2", "created": "Tue, 22 Jan 2008 00:46:16 GMT" }, { "version": "v3", "created": "Fri, 21 Mar 2008 07:56:25 GMT" }, { "version": "v4", "created": "Fri, 8 Aug 2008 01:37:04 GMT" } ]
2008-11-26T00:00:00
[ [ "Park", "Seong Chan", "" ], [ "Yamaguchi", "Satoshi", "" ] ]
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801.1723
Ozgur Cakir
Ozgur Cakir and Toshihide Takagahara
Quantum dynamics in electron-nuclei coupled spin system in quantum dots: Bunching, revival, and quantum correlation in electron-spin measurements
21 pages, to be published in Phys. Rev. B
Phys. Rev. B 77, 115304(2008)
10.1103/PhysRevB.77.115304
null
cond-mat.mes-hall
null
We investigate quantum dynamics in the electron-nuclei coupled spin system in quantum dots and clarify the fundamental features of quantum correlation induced via successive electron spin measurements. This quantum correlation leads to interesting phenomena such as the bunching of outcomes in the electron spin measurements and the revival of an arbitrary initial electron spin state. The nuclear spin system is also affected by the quantum correlation and is in fact squeezed via conditional measurements or postselection. This squeezing is confirmed by calculating the increase in the purity of the nuclear spin system. Thus the successive electron spin measurements provide a probabilistic method to squeeze the nuclear spin system. These new features are predicted not only for the case of a double quantum dots occupied by a pair of electrons but also for the case of a single quantum dot occupied by a single electron or a pair of electrons.
[ { "version": "v1", "created": "Fri, 11 Jan 2008 06:32:46 GMT" } ]
2009-11-13T00:00:00
[ [ "Cakir", "Ozgur", "" ], [ "Takagahara", "Toshihide", "" ] ]
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801.1724
M. Khalilian
S. Alimoradi, M. Khalilian
Bilinear Mixed Effects Models For Relations Between Universities
Submitted to the Electronic Journal of Statistics (http://www.i-journals.org/ejs/) by the Institute of Mathematical Statistics (http://www.imstat.org)
null
null
IMS-EJS-EJS_2008_167
stat.AP
null
this article illustrates the use of linear and bilinear random effects models to represent statistical dependencies that often characterize dyadic data such as international relations. In particular, we show how to estimate models for dyadic data that simultaneously take into account: regressor variables and third-order dependencies, such as transitivity, clustering, and balance. We apply this new approach to the relations among ph.d. of university in Iran over the period from 1991-2005, illustrating the presence and strength of second and third-order statistical dependencies in these data.
[ { "version": "v1", "created": "Fri, 11 Jan 2008 06:54:47 GMT" } ]
2008-01-14T00:00:00
[ [ "Alimoradi", "S.", "" ], [ "Khalilian", "M.", "" ] ]
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801.1725
Peter Moran
E.-M. Ilgenfritz, D. Leinweber, P. Moran, K. Koller, G. Schierholz, V. Weinberg
Vacuum structure revealed by over-improved stout-link smearing compared with the overlap analysis for quenched QCD
19 pages, 18 figures
Phys.Rev.D77:074502,2008; Erratum-ibid.D77:099902,2008
10.1103/PhysRevD.77.074502 10.1103/PhysRevD.77.099902
ADP-07-20/T660, HU-EP-07/62, LMU-ASC 73/07, DESY 07-219
hep-lat
null
A detailed comparison is made between the topological structure of quenched QCD as revealed by the recently proposed over-improved stout-link smearing in conjunction with an improved gluonic definition of the topological density on one hand and a similar analysis made possible by the overlap-fermionic topological charge density both with and without variable ultraviolet cutoff $\lambda_{cut}$. The matching is twofold, provided by fitting the density-density two-point functions on one hand and by a point-by-point fitting of the topological densities according to the two methods. We point out the similar cluster structure of the topological density for moderate smearing and $200 \mathrm{MeV} < \lambda_{cut} < 600 \mathrm{MeV}$, respectively. We demonstrate the relation of the gluonic topological density for extensive smearing to the location of the overlap zero modes and the lowest overlap non-zero mode as found for the unsmeared configurations.
[ { "version": "v1", "created": "Fri, 11 Jan 2008 06:55:49 GMT" } ]
2014-11-18T00:00:00
[ [ "Ilgenfritz", "E. -M.", "" ], [ "Leinweber", "D.", "" ], [ "Moran", "P.", "" ], [ "Koller", "K.", "" ], [ "Schierholz", "G.", "" ], [ "Weinberg", "V.", "" ] ]
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801.1726
S Habib Mazharimousavi
S. Habib Mazharimousavi and M. Halilsoy
Higher dimensional Yang-Mills black holes in third order Lovelock gravity
14 pages, 3 figures, to appear in Phys. Lett. B
Phys.Lett.B665:125-130,2008
10.1016/j.physletb.2008.06.007
null
gr-qc
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
By employing the higher (N\TEXTsymbol{>}5) dimensional version of the Wu-Yang Ansatz we obtain magnetically charged new black hole solutions in the Einstein-Yang-Mills-Lovelock (EYML) theory with second ($\alpha_{2}$) and third ($\alpha_{3}$)order parameters. These parameters, where $\alpha_{2}$ is also known as the Gauss-Bonnet parameter, modify the horizons (and the resulting thermodynamical properties) of the black holes. It is shown also that asymptotically ($r\to \infty $), these parameters contribute to an effective cosmological constant -without cosmological constant- so that the solution behaves de-Sitter (Anti de-Sitter) like.
[ { "version": "v1", "created": "Fri, 11 Jan 2008 07:32:36 GMT" }, { "version": "v2", "created": "Fri, 13 Jun 2008 08:20:09 GMT" } ]
2008-11-26T00:00:00
[ [ "Mazharimousavi", "S. Habib", "" ], [ "Halilsoy", "M.", "" ] ]
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801.1727
Shankar Prasad Das
Shankar P. Das and Gene F. Mazenko
Does Fluctuating Nonlinear Hydrodynamics Support an Ergodic-Nonergodic Transition?
11 pages
null
10.1103/PhysRevE.79.021504
null
cond-mat.soft
null
Despite its appeal, real and simulated glass forming systems do not undergo an ergodic-nonergodic (ENE) transition. We reconsider whether the fluctuating nonlinear hydrodynamics (FNH) model for this system, introduced by us in 1986, supports an ENE transition. Using nonperturbative arguments, with no reference to the hydrodynamic regime, we show that the FNH model does not support an ENE transition. Our results support the findings in the original paper. Assertions in the literature questioning the validity of the original work are shown to be in error.
[ { "version": "v1", "created": "Fri, 11 Jan 2008 07:39:56 GMT" } ]
2009-11-13T00:00:00
[ [ "Das", "Shankar P.", "" ], [ "Mazenko", "Gene F.", "" ] ]
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801.1728
Gregory Teitel'baum B.
Lev P. Gor'kov and Gregory B. Teitel'baum
The two-component physics in cuprates in the real space and in the momentum representation
8 pages, 6 figures, reported at LEHTSC 2007 conference (Tsukuba), submitted to Journal of Physics: Conference Series
null
10.1088/1742-6596/108/1/012009
null
cond-mat.supr-con
null
Gradual evolution of two phase coexistence between dynamical and static regimes in cuprates is first investigated in the real space by making use of the available neutron scattering, NMR and mSR data. Analysis of the Hall effect and the ARPES spectra reveals the presence of two groups of charge carriers in LSCO. The T-dependent component is due to the thermal activation of bound electron-hole structures seen near antinodal points in the Brillouin zone, thus introducing the two-component physics also for the momentum representation. Interpretation of so-called "van Hove bands" undergoes drastic changes. Importance of the findings for pseudo-gap physics is stressed. Relation to some recent STM and STS results is discussed.
[ { "version": "v1", "created": "Fri, 11 Jan 2008 07:52:49 GMT" } ]
2015-05-13T00:00:00
[ [ "Gor'kov", "Lev P.", "" ], [ "Teitel'baum", "Gregory B.", "" ] ]
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801.1729
Jinhui Chen
B.I. Abelev, et al (for the STAR Collaboration)
Spin alignment measurements of the $K^{*0}(892)$ and $\phi(1020)$ vector mesons at RHIC
7 pages, 4 figures. fig.1 updated; one more reference added, one typo corrected, published in PRC.77.061902
Phys.Rev.C77:061902,2008
10.1103/PhysRevC.77.061902
null
nucl-ex
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present the first spin alignment measurements for the $K^{*0}(892)$ and $\phi(1020)$ vector mesons produced at mid-rapidity with transverse momenta up to 5 GeV/c at $\sqrt{s_{NN}}$ = 200 GeV at RHIC. The diagonal spin density matrix elements with respect to the reaction plane in Au+Au collisions are $\rho_{00}$ = 0.32 $\pm$ 0.04 (stat) $\pm$ 0.09 (syst) for the $K^{*0}$ ($0.8<p_T<5.0$ GeV/c) and $\rho_{00}$ = 0.34 $\pm$ 0.02 (stat) $\pm$ 0.03 (syst) for the $\phi$ ($0.4<p_T<5.0$ GeV/c), and are constant with transverse momentum and collision centrality. The data are consistent with the unpolarized expectation of 1/3 and thus no evidence is found for the transfer of the orbital angular momentum of the colliding system to the vector meson spins. Spin alignments for $K^{*0}$ and $\phi$ in Au+Au collisions were also measured with respect to the particle's production plane. The $\phi$ result, $\rho_{00}$ = 0.41 $\pm$ 0.02 (stat) $\pm$ 0.04 (syst), is consistent with that in p+p collisions, $\rho_{00}$ = 0.39 $\pm$ 0.03 (stat) $\pm$ 0.06 (syst), also measured in this work. The measurements thus constrain the possible size of polarization phenomena in the production dynamics of vector mesons.
[ { "version": "v1", "created": "Fri, 11 Jan 2008 08:02:05 GMT" }, { "version": "v2", "created": "Fri, 13 Jun 2008 14:10:52 GMT" } ]
2019-08-13T00:00:00
[ [ "Abelev", "B. I.", "" ] ]
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801.173
Satya N. Majumdar
David S. Dean and Satya N. Majumdar
Extreme Value Statistics of Eigenvalues of Gaussian Random Matrices
17 pages Revtex, 5 .eps figures included
Phys. Rev. E, 77, 041108 (2008)
10.1103/PhysRevE.77.041108
null
cond-mat.stat-mech
null
We compute exact asymptotic results for the probability of the occurrence of large deviations of the largest (smallest) eigenvalue of random matrices belonging to the Gaussian orthogonal, unitary and symplectic ensembles. In particular, we show that the probability that all the eigenvalues of an (NxN) random matrix are positive (negative) decreases for large N as ~\exp[-\beta \theta(0) N^2] where the Dyson index \beta characterizes the ensemble and the exponent \theta(0)=(\ln 3)/4=0.274653... is universal. We compute the probability that the eigenvalues lie in the interval [\zeta_1,\zeta_2] which allows us to calculate the joint probability distribution of the minimum and the maximum eigenvalue. As a byproduct, we also obtain exactly the average density of states in Gaussian ensembles whose eigenvalues are restricted to lie in the interval [\zeta_1,\zeta_2], thus generalizing the celebrated Wigner semi-circle law to these restricted ensembles. It is found that the density of states generically exhibits an inverse square-root singularity at the location of the barriers. These results are confirmed by numerical simulations.
[ { "version": "v1", "created": "Fri, 11 Jan 2008 08:24:25 GMT" } ]
2009-11-13T00:00:00
[ [ "Dean", "David S.", "" ], [ "Majumdar", "Satya N.", "" ] ]
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801.1731
Laurentiu Leustean
Laurentiu Leustean
Proof mining in ${\mathbb R}$-trees and hyperbolic spaces
in G. Mints and R. de Queiroz (Eds.): Proceedings of the 13th Workshop on Logic, Language, Information and Computation (WoLLIC 2006), Stanford University, CA, USA, 18-21 July 2006
Electronic Notes in Theoretical Computer Science, Vol. 165 (2006), 95-106
null
null
math.LO math.FA
null
This paper is part of the general project of proof mining, developed by Kohlenbach. By "proof mining" we mean the logical analysis of mathematical proofs with the aim of extracting new numerically relevant information hidden in the proofs. We present logical metatheorems for classes of spaces from functional analysis and hyperbolic geometry, like Gromov hyperbolic spaces, ${\mathbb R}$-trees and uniformly convex hyperbolic spaces. Our theorems are adaptations to these structures of previous metatheorems of Gerhardy and Kohlenbach, and they guarantee a-priori, under very general logical conditions, the existence of uniform bounds. We give also an application in nonlinear functional analysis, more specifically in metric fixed-point theory. Thus, we show that the uniform bound on the rate of asymptotic regularity for the Krasnoselski-Mann iterations of nonexpansive mappings in uniformly convex hyperbolic spaces obtained in a previous paper is an instance of one of our metatheorems.
[ { "version": "v1", "created": "Fri, 11 Jan 2008 08:27:14 GMT" } ]
2008-01-14T00:00:00
[ [ "Leustean", "Laurentiu", "" ] ]
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801.1732
Hans-Werner Hammer
Eric Braaten, H.-W. Hammer, Daekyoung Kang, Lucas Platter
Three-Body Recombination of Identical Bosons with a Large Positive Scattering Length at Nonzero Temperature
34 pages, 10 figures, published version
Phys.Rev.A78:043605,2008
10.1103/PhysRevA.78.043605
HISKP-TH-08-01
cond-mat.other hep-ph nucl-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
For identical bosons with a large scattering length, the dependence of the 3-body recombination rate on the collision energy is determined in the zero-range limit by universal functions of a single scaling variable. There are six scaling functions for angular momentum zero and one scaling function for each higher partial wave. We calculate these universal functions by solving the Skorniakov--Ter-Martirosian equation. The results for the 3-body recombination as a function of the collision energy are in good agreement with previous results from solving the 3-body Schroedinger equation for 4He atoms. The universal scaling functions can be used to calculate the 3-body recombination rate at nonzero temperature. We obtain an excellent fit to the data from the Innsbruck group for 133Cs atoms with a large positive scattering length.
[ { "version": "v1", "created": "Fri, 11 Jan 2008 08:37:46 GMT" }, { "version": "v2", "created": "Fri, 14 Nov 2008 09:53:23 GMT" } ]
2008-12-18T00:00:00
[ [ "Braaten", "Eric", "" ], [ "Hammer", "H. -W.", "" ], [ "Kang", "Daekyoung", "" ], [ "Platter", "Lucas", "" ] ]
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801.1733
Emmanuel Kowalski
F. Jouve, E. Kowalski, D. Zywina
An explicit integral polynomial whose splitting field has Galois group W(E_8)
18 pages
null
null
null
math.NT math.GR
null
Using the principle that characteristic polynomials of matrices obtained from elements of a reductive group over a number field typically have splitting field with Galois group isomorphic to its Weyl group, we construct an explicit monic integral polynomial of degree 240 whose splitting field has Galois group the Weyl group of the exceptional group of type E_8.
[ { "version": "v1", "created": "Fri, 11 Jan 2008 08:41:12 GMT" } ]
2008-01-14T00:00:00
[ [ "Jouve", "F.", "" ], [ "Kowalski", "E.", "" ], [ "Zywina", "D.", "" ] ]
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801.1734
Brandon DiNunno
Brandon S. DiNunno and Richard A. Matzner
The Volume Inside a Black Hole
17 pages, 5 figures
Gen.Rel.Grav.42:63-76,2010
10.1007/s10714-009-0814-x
null
gr-qc
null
The horizon (the surface) of a black hole is a null surface, defined by those hypothetical "outgoing" light rays that just hover under the influence of the strong gravity at the surface. Because the light rays are orthogonal to the spatial 2-dimensional surface at one instant of time, the surface of the black hole is the same for all observers (i.e. the same for all coordinate definitions of "instant of time"). This value is 4*(pi)* (2Gm/c^2)^2 for nonspinning black holes, with G= Newton's constant, c= speed of light, and m= mass of the black hole. The 3-dimensional spatial volume inside a black hole, in contrast, depends explicitly on the definition of time, and can even be time dependent, or zero. We give examples of the volume found inside a standard, nonspinning spherical black hole, for several different standard time-coordinate definitions. Elucidating these results for the volume provides a new pedagogical resource of facts already known in principle to the relativity community, but rarely worked out.
[ { "version": "v1", "created": "Fri, 11 Jan 2008 08:44:01 GMT" } ]
2010-01-04T00:00:00
[ [ "DiNunno", "Brandon S.", "" ], [ "Matzner", "Richard A.", "" ] ]
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801.1735
Janyska Josef
Josef Jany\v{s}ka, Marco Modugno
Geometric structures of the classical general relativistic phase space
null
null
10.1142/S021988780800303X
null
math-ph math.DG math.MP
null
This paper is concerned with basic geometric properties of the phase space of a classical general relativistic particle, regarded as the 1st jet space of motions, i.e. as the 1st jet space of timelike 1--dimensional submanifolds of spacetime. This setting allows us to skip constraints. Our main goal is to determine the geometric conditions by which the Lorentz metric and a connection of the phase space yield contact and Jacobi structures. In particular, we specialise these conditions to the cases when the connection of the phase space is generated by the metric and an additional tensor. Indeed, the case generated by the metric and the electromagnetic field is included, as well.
[ { "version": "v1", "created": "Fri, 11 Jan 2008 08:51:10 GMT" } ]
2015-05-13T00:00:00
[ [ "Janyška", "Josef", "" ], [ "Modugno", "Marco", "" ] ]
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801.1736
Walid Hachem
Abla Kammoun, Malika Kharouf, Walid Hachem, Jamal Najim
A Central Limit Theorem for the SNR at the Wiener Filter Output for Large Dimensional Signals
null
null
null
null
cs.IT math.IT
null
Consider the quadratic form $\beta = {\bf y}^* ({\bf YY}^* + \rho {\bf I})^{-1} {\bf y}$ where $\rho$ is a positive number, where ${\bf y}$ is a random vector and ${\bf Y}$ is a $N \times K$ random matrix both having independent elements with different variances, and where ${\bf y}$ and ${\bf Y}$ are independent. Such quadratic forms represent the Signal to Noise Ratio at the output of the linear Wiener receiver for multi dimensional signals frequently encountered in wireless communications and in array processing. Using well known results of Random Matrix Theory, the quadratic form $\beta$ can be approximated with a known deterministic real number $\bar\beta_K$ in the asymptotic regime where $K\to\infty$ and $K/N \to \alpha > 0$. This paper addresses the problem of convergence of $\beta$. More specifically, it is shown here that $\sqrt{K}(\beta - \bar\beta_K)$ behaves for large $K$ like a Gaussian random variable which variance is provided.
[ { "version": "v1", "created": "Fri, 11 Jan 2008 09:18:52 GMT" } ]
2008-01-14T00:00:00
[ [ "Kammoun", "Abla", "" ], [ "Kharouf", "Malika", "" ], [ "Hachem", "Walid", "" ], [ "Najim", "Jamal", "" ] ]
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801.1737
Rico Zenklusen
Rico Zenklusen
Extensions to Network Flow Interdiction on Planar Graphs
16 pages, 3 figures
null
null
null
cs.DM
null
Network flow interdiction analysis studies by how much the value of a maximum flow in a network can be diminished by removing components of the network constrained to some budget. Although this problem is strongly NP-complete on general networks, pseudo-polynomial algorithms were found for planar networks with a single source and a single sink and without the possibility to remove vertices. In this work we introduce pseudo-polynomial algorithms which overcome some of the restrictions of previous methods. We propose a planarity-preserving transformation that allows to incorporate vertex removals and vertex capacities in pseudo-polynomial interdiction algorithms for planar graphs. Additionally, a pseudo-polynomial algorithm is introduced for the problem of determining the minimal interdiction budget which is at least needed to make it impossible to satisfy the demand of all sink nodes, on planar networks with multiple sources and sinks satisfying that the sum of the supplies at the source nodes equals the sum of the demands at the sink nodes. Furthermore we show that the k-densest subgraph problem on planar graphs can be reduced to a network flow interdiction problem on a planar graph with multiple sources and sinks and polynomially bounded input numbers. However it is still not known if either of these problems can be solved in polynomial time.
[ { "version": "v1", "created": "Fri, 11 Jan 2008 09:13:23 GMT" } ]
2008-01-14T00:00:00
[ [ "Zenklusen", "Rico", "" ] ]
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801.1738
Alejandro Fernandez-Martinez
Gabriela Roman-Ross (LGIT), Gabriel Cuello (ILL), Xavier Turrillas (ICC), Alejandro Fernandez-Martinez (LGIT, ILL), Laurent Charlet (LGIT)
Arsenite sorption and co-precipitation with calcite
9 pages
Chemical Geology 233, 3-4 (2006) 328-336
10.1016/j.chemgeo.2006.04.007
null
physics.chem-ph physics.geo-ph
null
Sorption of As(III) by calcite was investigated as a function of As(III) concentration, time and pH. The sorption isotherm, i.e. the log As(III) vs. log [As(OH)3 degrees / Assat] plot is S-shaped and has been modelled on an extended version of the surface precipitation model. At low concentrations, As(OH)3 degrees is adsorbed by complexation to surface Ca surface sites, as previously described by the X-ray standing wave technique. The inflexion point of the isotherm, where As(OH)3 degrees is limited by the amount of surface sites (ST), yields 6 sites nm-2 in good agreement with crystallographic data. Beyond this value, the amount of sorbed arsenic increases linearly with solution concentration, up to the saturation of arsenic with respect to the precipitation of CaHAsO3(s). The solid solutions formed in this concentration range were examined by X-ray and neutron diffraction. The doped calcite lattice parameters increase with arsenic content while c/a ratio remains constant. Our results made on bulk calcite on the atomic displacement of As atoms along [0001] direction extend those published by Cheng et al., (1999) on calcite surface. This study provides a molecular-level explanation for why As(III) is trapped by calcite in industrial treatments.
[ { "version": "v1", "created": "Fri, 11 Jan 2008 09:19:53 GMT" } ]
2008-01-14T00:00:00
[ [ "Roman-Ross", "Gabriela", "", "LGIT" ], [ "Cuello", "Gabriel", "", "ILL" ], [ "Turrillas", "Xavier", "", "ICC" ], [ "Fernandez-Martinez", "Alejandro", "", "LGIT, ILL" ], [ "Charlet", "Laurent", "", "LGIT" ] ]
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801.1739
Shigeru Yamagami
Shigeru Yamagami
Geometry of Quasi-Free States of CCR Algebras
34 pages
Int.J.Math.21:875-913,2010
10.1142/S0129167X10006306
null
math-ph math.MP math.OA
null
Geometric positions of square roots of quasi-free states of CCR algebras are investigated together with an explicit formula for transition amplitudes among them.
[ { "version": "v1", "created": "Fri, 11 Jan 2008 09:29:29 GMT" } ]
2014-11-18T00:00:00
[ [ "Yamagami", "Shigeru", "" ] ]
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801.174
Sergio Caracciolo
Sergio Caracciolo, Bortolo Matteo Mognetti, Andrea Pelissetto
Third virial coefficient for 4-arm and 6-arm star polymers
11 pages, 2 figures
Macromol. Theory Simul. 17 (2008) 67-72
10.1002/mats.200800001
null
cond-mat.soft cond-mat.stat-mech
null
We discuss the computation of the third virial coefficient in polymer systems, focusing on an additional contribution absent in the case of monoatomic fluids. We determine the interpenetration ratio and several quantities that involve the third virial coefficient for star polymers with 4 and 6 arms in the good-solvent regime, in the limit of a large degree of polymerization.
[ { "version": "v1", "created": "Fri, 11 Jan 2008 09:41:54 GMT" }, { "version": "v2", "created": "Fri, 15 Feb 2008 11:46:50 GMT" } ]
2008-04-14T00:00:00
[ [ "Caracciolo", "Sergio", "" ], [ "Mognetti", "Bortolo Matteo", "" ], [ "Pelissetto", "Andrea", "" ] ]
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801.1741
Marcello Rosini
Marcello Rosini, Rita Magri, Peter Kratzer
Adsorption of Indium on a InAs wetting layer deposited on the GaAs(001) surface
null
null
10.1103/PhysRevB.77.165323
null
cond-mat.mtrl-sci
null
In this work we perform a first-principles study of the adsorption properties of an In adatom deposited on 1.75 monolayers (ML) InAs, forming a wetting layer on GaAs$(001)$ with the $\alpha_2 (2\times4)$ or $\beta_2 (2\times4)$ reconstruction. The structural properties of these reconstructions have been studied: we determine the equilibrium geometry of the surfaces and their stability for various growth conditions. We have then carried out a detailed study of the potential energy surface (PES) for an In adsorbate, finding the minima and the saddle points. The main characteristics of the PES and the bonding configurations of the In adatom on the surface are analyzed by comparing with analogous studies reported in the literature, trying to extract the effects due to: (i) the compressive strain to which the InAs adlayer is subjected, (ii) the particular surface reconstruction, and (iii) the wetting layer composition. We found that, in general, stable adsorption sites are located at: (i) locations besides the As in-dimers, (ii) positions bridging two As in-dimers, (iii) between two adjacent ad-dimers (only in $\beta_2$), and (iv) locations bridging two As ad-dimers. We find also other shallower adsorption sites which are more reconstruction specific due to the lower symmetry of the $\alpha_2$ reconstruction compared to the $\beta_2$ reconstruction.
[ { "version": "v1", "created": "Fri, 11 Jan 2008 09:54:35 GMT" } ]
2009-11-13T00:00:00
[ [ "Rosini", "Marcello", "" ], [ "Magri", "Rita", "" ], [ "Kratzer", "Peter", "" ] ]
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801.1742
Mancho Manev
Dimitar Mekerov, Mancho Manev
On 4n-dimensional Lie groups as quasi-Kaehler manifolds with Killing Norden metric
11 pages
Novi Sad J. Math., vol. 38, no. 2 (2008), 105--113
null
null
math.DG
null
A 4n-parametric family of 4n-dimensional quasi-Kaehler manifolds with Killing Norden metric is constructed on a Lie group. This family is characterized geometrically.
[ { "version": "v1", "created": "Fri, 11 Jan 2008 10:02:49 GMT" }, { "version": "v2", "created": "Fri, 25 Apr 2008 09:40:38 GMT" } ]
2014-04-15T00:00:00
[ [ "Mekerov", "Dimitar", "" ], [ "Manev", "Mancho", "" ] ]
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801.1743
H. Caldas
Heron Caldas, and A. L. Mota
Temperature Effects in a Fermi Gas with Population Imbalance
9 pages, 12 figures; minor typos corrected, references added
J.Stat.Mech.0808:P08013,2008
10.1088/1742-5468/2008/08/P08013
null
cond-mat.str-el cond-mat.supr-con hep-ph nucl-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We investigate temperature effects in a Fermi gas with imbalanced spin populations. From the general expression of the thermal gap equation we find, in {\it weak coupling limit}, an analytical expression for the transition temperature $T_c$ as a function of various possibilities of chemical potential and mass asymmetries between the two particle species. For a range of asymmetry between certain specific values, this equation always has two solutions for $T_c$ which has been interpreted as a reentrant phenomena or a pairing induced by temperature effect. We show that the lower $T_c$ is never related to a stable solution. The same results are obtained in {\it strong coupling limit}. The thermodynamical potential is carefully analyzed to avoid the consideration of the unstable solutions. We also obtain the tricritical points for the chemical potential and mass imbalanced cases, and beyond these points we properly minimize the thermodynamic potential to find the stable and metastable first order transition lines.
[ { "version": "v1", "created": "Fri, 11 Jan 2008 19:00:34 GMT" }, { "version": "v2", "created": "Thu, 5 Jun 2008 22:00:49 GMT" }, { "version": "v3", "created": "Fri, 29 Aug 2008 03:47:28 GMT" } ]
2008-11-26T00:00:00
[ [ "Caldas", "Heron", "" ], [ "Mota", "A. L.", "" ] ]
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801.1744
L. Sunil Chandran
Manu Basavaraju, L. Sunil Chandran
Acyclic Edge Coloring of Graphs with Maximum Degree 4
13 pages
null
null
null
math.CO
null
An $acyclic$ edge coloring of a graph is a proper edge coloring such that there are no bichromatic cycle s. The \emph{acyclic chromatic index} of a graph is the minimum number k such that there is an acyclic e dge coloring using k colors and is denoted by $a'(G)$. It was conjectured by Alon, Sudakov and Zaks that for any simple and finite graph $G$, $a'(G)\le \Delta+2$, where $\Delta =\Delta(G)$ denotes the maximum degree of $G$. We prove the conjecture for connected graphs with $\Delta(G) \le 4$, with the additional restriction that $m \le 2n-1$, where $n$ is the number of vertices and $m$ is the number of edges in $G $. Note that for any graph $G$, $m \le 2n$, when $\Delta(G) \le 4$. It follows that for any graph $G$ if $\Delta(G) \le 4$, then $a'(G) \le 7$.
[ { "version": "v1", "created": "Fri, 11 Jan 2008 10:17:27 GMT" } ]
2008-01-14T00:00:00
[ [ "Basavaraju", "Manu", "" ], [ "Chandran", "L. Sunil", "" ] ]
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801.1745
Maria Vallarino
S. Meda, P. Sjogren, M. Vallarino
On the H^1-L^1 boundedness of operators
This paper will appear in Proceedings of the American Mathematical Society
null
null
null
math.CA
null
We prove that if q is in (1,\infty), Y is a Banach space and T is a linear operator defined on the space of finite linear combinations of (1,q)-atoms in R^n which is uniformly bounded on (1,q)-atoms, then T admits a unique continuous extension to a bounded linear operator from H^1(R^n) to Y. We show that the same is true if we replace (1,q)-atoms with continuous (1,\infty)-atoms. This is known to be false for (1,\infty)-atoms.
[ { "version": "v1", "created": "Fri, 11 Jan 2008 10:22:26 GMT" } ]
2008-01-14T00:00:00
[ [ "Meda", "S.", "" ], [ "Sjogren", "P.", "" ], [ "Vallarino", "M.", "" ] ]
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801.1746
Armando Flavio Rodrigues
L. V. Belvedere and A. F. Rodrigues
Bosonized Quantum Hamiltonian of the Two-Dimensional Derivative-Coupling Model
17 pages
null
null
null
hep-th
null
Using the operator formulation we discuss the bosonization of the two-dimensional derivative-coupling model. The fully bosonized quantum Hamiltonian is obtained by computing the composite operators as the leading terms in the Wilson short distance expansion for the operator products at the same point. In addition, the quantum Hamiltonian contains topological terms which give trivial contributions to the equations of motion. Taking into account the quantum corrections to the bosonic equations of motion and to the scale dimension of the Fermi field operator, the operator solution is obtained in terms of a generalized Mandelstam soliton operator with continuous Lorentz spin (generalized statistics).
[ { "version": "v1", "created": "Fri, 11 Jan 2008 10:23:10 GMT" } ]
2008-01-14T00:00:00
[ [ "Belvedere", "L. V.", "" ], [ "Rodrigues", "A. F.", "" ] ]
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801.1747
Isabel P\'erez-Arjona
Isabel Perez-Arjona, Victor J. Sanchez-Morcillo and Victor Espinosa
Bistable and dynamic states of parametrically excited ultrasound in a fluid-filled cavity
5 figures. Submitted to JASA
null
10.1121/1.3119628
null
nlin.CD
null
In this paper we have considered the problem of parametric sound generation in an acoustic resonator flled with a fluid, taking explicitely into account the influence of the nonlinearly generated second harmonic. A simple model is presented, and its stationary solutions obtained. The main feature of these solutions is the appearance of bistable states of the fundamental field resulting from the coupling to the second harmonic. An experimental setup was designed to check the predictions of the theory. The results are consistent with the predicted values for the mode amplitudes and parametric thresholds. At higher driving values a self-modulation of the amplitudes is observed. We identify this phenomenon with a secondary instability previously reported in the frame of the theoretical model.
[ { "version": "v1", "created": "Fri, 11 Jan 2008 10:24:16 GMT" }, { "version": "v2", "created": "Tue, 20 May 2008 15:45:19 GMT" } ]
2015-05-13T00:00:00
[ [ "Perez-Arjona", "Isabel", "" ], [ "Sanchez-Morcillo", "Victor J.", "" ], [ "Espinosa", "Victor", "" ] ]
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801.1748
Jonas Bj\"ornsson
Jonas Bjornsson, Stephen Hwang
On small tension p-branes
7 pages
Phys.Lett.B662:270-274,2008
10.1016/j.physletb.2008.03.013
null
hep-th
null
This paper deals with p-branes with small but non-zero tension. We prove the existence of canonical transformations, within a perturbation theory, that link specific geometries of p-branes to solvable theories, namely string-like and particle-like theories. The specific shapes correspond to stretched configurations. For configurations linked to string-like theories one will upon quantization get a critical dimension of (25+p).
[ { "version": "v1", "created": "Fri, 11 Jan 2008 10:27:30 GMT" } ]
2008-11-26T00:00:00
[ [ "Bjornsson", "Jonas", "" ], [ "Hwang", "Stephen", "" ] ]
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801.1749
Julius Borcea
Julius Borcea, Alexander Guterman, Boris Shapiro
Preserving positive polynomials and beyond
15 pages, no figures, LaTeX2e
null
null
null
math.CA math.FA
null
Following the classical approach of P\'olya-Schur theory we initiate in this paper the study of linear operators acting on $\mathbb{R}[x]$ and preserving either the set of positive univariate polynomials or similar sets of non-negative and elliptic polynomials.
[ { "version": "v1", "created": "Fri, 11 Jan 2008 14:11:52 GMT" }, { "version": "v2", "created": "Tue, 22 Jan 2008 01:15:59 GMT" } ]
2008-01-22T00:00:00
[ [ "Borcea", "Julius", "" ], [ "Guterman", "Alexander", "" ], [ "Shapiro", "Boris", "" ] ]
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801.175
Alex Zazunov
L. Dell'Anna, A. Zazunov, and R. Egger
Superconducting non-equilibrium transport through a weakly interacting quantum dot
6 pages, 6 figures, replaced with published version
Phys. Rev. B 77, 104525 (2008)
10.1103/PhysRevB.77.104525
null
cond-mat.supr-con cond-mat.mes-hall
null
We study the out-of-equilibrium current through an interacting quantum dot modelled as an Anderson impurity contacted by two BCS superconductors held at fixed voltage bias. In order to account for multiple Andreev reflections, we develop a Keldysh Green's function scheme perturbative in the dot's interaction strength. We find an unexpected enhancement of the current due to repulsive interactions for small lead-to-dot couplings.
[ { "version": "v1", "created": "Fri, 11 Jan 2008 10:42:50 GMT" }, { "version": "v2", "created": "Wed, 26 Mar 2008 15:04:13 GMT" } ]
2008-03-26T00:00:00
[ [ "Dell'Anna", "L.", "" ], [ "Zazunov", "A.", "" ], [ "Egger", "R.", "" ] ]
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801.1751
Antonino Di Piazza
A. Di Piazza
Exact solution of the Landau-Lifshitz equation in a plane wave
11 pages, Lett. Math. Phys. vol. 83, 305 (2008)
null
null
null
physics.optics physics.class-ph
null
The Landau-Lifshitz form of the Lorentz-Abraham-Dirac equation in the presence of a plane wave of arbitrary shape and polarization is solved exactly and in closed form. The explicit solution is presented in the particular, paradigmatic cases of a constant crossed field and of a monochromatic wave with circular and with linear polarization.
[ { "version": "v1", "created": "Fri, 11 Jan 2008 10:49:36 GMT" }, { "version": "v2", "created": "Tue, 26 Feb 2008 17:33:02 GMT" } ]
2008-02-26T00:00:00
[ [ "Di Piazza", "A.", "" ] ]
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801.1752
Jaroslav Hruby
Jaroslav Hruby (Institute of Physics AV CR, Czech Republic)
Q-deformation, discrete time and quantum information as fiber space
QIP 2008. arXiv admin note: substantial text overlap (pp 5-10) with arXiv:quant-ph/0503198 by different author
null
null
null
quant-ph
null
In this paper we show the connection between the q-deformation and discrete time, starting from the q-deformed Heisenberg uncertainty relation and q-deformation calculus. We show that time has discrete nature and for this case we construct the connection between quantum information and spacetime via fiber space structure.
[ { "version": "v1", "created": "Fri, 11 Jan 2008 10:54:21 GMT" } ]
2012-07-31T00:00:00
[ [ "Hruby", "Jaroslav", "", "Institute of Physics AV CR, Czech Republic" ] ]
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801.1753
Davide Emilio Galli
E. Vitali, M. Rossi, F. Tramonto, D.E. Galli, L. Reatto
Path Integral Ground State study of 2D solid 4He
4 pages, 4 figures
null
null
null
cond-mat.other cond-mat.stat-mech
null
We have studied a two-dimensional triangular commensurate crystal of 4He with the exact T=0 K Path Integral Ground State (PIGS) Monte Carlo method. We have projected onto the true ground state both a Jastrow-Nosanow wave function, in which equilibrium positions are explicitly given and no Bose-Einstein (BEC) is present, and a translationally invariant shadow wave function, in which the solid phase emerges through a spontaneously broken symmetry process and it has BEC. We find a remarkable convergence to the same properties, both the diagonal ones as well as the off-diagonal one-body density matrix rho_1. This supplies a strong evidence that no variational bias are present in the PIGS method. We find no BEC in the commensurate 2D 4He crystal at T=0 K, rho_1 shows an exponential decay in the large distance range. The structure found in rho_1 is due to virtual vacancy--interstitial pairs and this shows up in the momentum distribution.
[ { "version": "v1", "created": "Fri, 11 Jan 2008 10:57:49 GMT" }, { "version": "v2", "created": "Thu, 17 Jan 2008 17:48:36 GMT" }, { "version": "v3", "created": "Fri, 1 Feb 2008 14:56:09 GMT" } ]
2008-02-01T00:00:00
[ [ "Vitali", "E.", "" ], [ "Rossi", "M.", "" ], [ "Tramonto", "F.", "" ], [ "Galli", "D. E.", "" ], [ "Reatto", "L.", "" ] ]
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801.1754
Ctirad Klimcik
Ctirad Klimcik
Affine Poisson Groups and WZW Model
This is a contribution to the Proc. of the Seventh International Conference ''Symmetry in Nonlinear Mathematical Physics'' (June 24-30, 2007, Kyiv, Ukraine), published in SIGMA (Symmetry, Integrability and Geometry: Methods and Applications) at http://www.emis.de/journals/SIGMA/
SIGMA 4:003,2008
10.3842/SIGMA.2008.003
null
math-ph math.MP
null
We give a detailed description of a dynamical system which enjoys a Poisson-Lie symmetry with two non-isomorphic dual groups. The system is obtained by taking the $q\to\infty$ limit of the q-deformed WZW model and the understanding of its symmetry structure results in uncovering an interesting duality of its exchange relations.
[ { "version": "v1", "created": "Fri, 11 Jan 2008 11:06:57 GMT" } ]
2008-12-19T00:00:00
[ [ "Klimcik", "Ctirad", "" ] ]
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801.1755
Khamphee Karwan
Khamphee Karwan
The Coincidence Problem and Interacting Holographic Dark Energy
16 pages, 5 figures; revised version to appear in JCAP; references added
JCAP0805:011,2008
10.1088/1475-7516/2008/05/011
null
astro-ph
null
We study the dynamical behaviour of the interacting holographic dark energy model whose interaction term is $Q=3H(\lam_d\rho_d + \lam_c\rho_c)$, where $\rho_d$ and $\rho_c$ are the energy density of dark energy and CDM respectively. To satisfy the observational constraints from SNIa, CMB shift parameter and BAO measurement, if $\lam_c = \lam_d$ or $\lam_d, \lam_c >0$, the cosmic evolution will only reach the attractor in the future and the ratio $\rho_c/\rho_d$ cannot be slowly varying at present. Since the cosmic attractor can be reached in the future even when the present values of the cosmological parameters do not satisfy the observational constraints, the coincidence problem is not really alleviated in this case. However, if $\lam_c \neq \lam_d$ and they are allowed to be negative, the ratio $\rho_c/\rho_d$ can be slowly varying at present and the cosmic attractor can be reached near the present epoch. Hence, the alleviation of the coincidence problem is attainable in this case. The alleviation of coincidence problem in this case is still attainable when confronting this model to SDSS data.
[ { "version": "v1", "created": "Fri, 11 Jan 2008 11:10:18 GMT" }, { "version": "v2", "created": "Sun, 10 Feb 2008 12:40:48 GMT" }, { "version": "v3", "created": "Wed, 14 May 2008 16:44:23 GMT" } ]
2008-11-26T00:00:00
[ [ "Karwan", "Khamphee", "" ] ]
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801.1756
Manuel J. Schmidt
Manuel J. Schmidt and Reinhold Oppermann
New technique for replica symmetry breaking with application to the SK-model at and near T=0
null
null
10.1103/PhysRevE.77.061104
null
cond-mat.dis-nn cond-mat.stat-mech
null
We describe a novel method which allows the treatment of high orders of replica-symmetry-breaking (RSB) at low temperatures as well as at T=0 directly, without a need for approximations or scaling assumptions. It yields the low temperature order function q(a,T) in the full range $0\leq a <\infty$ and is complete in the sense that all observables can be calculated from it. The behavior of some observables and the finite RSB theory itself is analyzed as one approaches continuous RSB. The validity and applicability of the traditional continuous formulation is then scrutinized and a new continuous RSB formulation is proposed.
[ { "version": "v1", "created": "Fri, 11 Jan 2008 11:12:15 GMT" } ]
2013-05-29T00:00:00
[ [ "Schmidt", "Manuel J.", "" ], [ "Oppermann", "Reinhold", "" ] ]
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801.1757
Stanislaw Kryszewski
Stanislaw Kryszewski, Justyna Czechowska-Kryszk
Master equation - tutorial approach
38 pages, 4 figures
null
null
null
quant-ph
null
We do not present any original or new material. This is a tutorial addressed to students who need to study the microscopic derivation of the quantum-mechanical master equation encountered in many practical physical situations.
[ { "version": "v1", "created": "Fri, 11 Jan 2008 11:26:09 GMT" } ]
2008-01-14T00:00:00
[ [ "Kryszewski", "Stanislaw", "" ], [ "Czechowska-Kryszk", "Justyna", "" ] ]
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801.1758
Piero Barone
Piero Barone
A new transform for solving the noisy complex exponentials approximation problem
42 pages, 5 figures
Journal of Approximation Theory, vol.155, pp. 1-27, 2008
10.1016/j.jat.2008.04.007
null
math.ST math.NA stat.ME stat.TH
null
The problem of estimating a complex measure made up by a linear combination of Dirac distributions centered on points of the complex plane from a finite number of its complex moments affected by additive i.i.d. Gaussian noise is considered. A random measure is defined whose expectation approximates the unknown measure under suitable conditions. An estimator of the approximating measure is then proposed as well as a new discrete transform of the noisy moments that allows to compute an estimate of the unknown measure. A small simulation study is also performed to experimentally check the goodness of the approximations.
[ { "version": "v1", "created": "Fri, 11 Jan 2008 11:30:34 GMT" } ]
2012-05-03T00:00:00
[ [ "Barone", "Piero", "" ] ]
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801.1759
Demetrios Vlachos Sotirios
D. Xenides, D. S. Vlachos, T. E. Simos
Synchronization in Complex Systems Following the Decision Based Queuing Process: The Rhythmic Applause as a Test Case
16 pages, 5 figures
null
10.1088/1742-5468/2008/07/P07017
null
cond-mat.stat-mech cond-mat.other
null
Living communities can be considered as complex systems, thus a fertile ground for studies related to their statistics and dynamics. In this study we revisit the case of the rhythmic applause by utilizing the model proposed by V\'azquez et al. [A. V\'azquez et al., Phys. Rev. E 73, 036127 (2006)] augmented with two contradicted {\it driving forces}, namely: {\it Individuality} and {\it Companionship}. To that extend, after performing computer simulations with a large number of oscillators we propose an explanation on the following open questions (a) why synchronization occurs suddenly, and b) why synchronization is observed when the clapping period ($T_c$) is $1.5 \cdot T_s < T_c < 2.0 \cdot T_s$ ($T_s$ is the mean self period of the spectators) and is lost after a time. Moreover, based on the model, a weak preferential attachment principle is proposed which can produce complex networks obeying power law in the distribution of number edges per node with exponent greater than 3.
[ { "version": "v1", "created": "Fri, 11 Jan 2008 11:37:34 GMT" } ]
2009-11-13T00:00:00
[ [ "Xenides", "D.", "" ], [ "Vlachos", "D. S.", "" ], [ "Simos", "T. E.", "" ] ]
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801.176
Hiromichi Takagi
Hiromichi Takagi and Francesco Zucconi
Scorza quartics of trigonal spin curves and their varieties of power sums
null
null
null
null
math.AG
null
Our fundamental result is the construction of new subvarieties in the varieties of power sums for the Scorza quartic of any general pairs of trigonal curves and non-effective theta characteristics. This is a generalization of Mukai's description of smooth prime Fano threefolds of genus twelve as the varieties of power sums for plane quartics. Among other applications, we give an affirmative answer to the conjecture of Dolgachev and Kanev on the existence of the Scorza quartic for any general pairs of curves and non-effective theta characteristics.
[ { "version": "v1", "created": "Fri, 11 Jan 2008 11:46:50 GMT" } ]
2008-01-14T00:00:00
[ [ "Takagi", "Hiromichi", "" ], [ "Zucconi", "Francesco", "" ] ]
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801.1761
Ramanpreet Kaur
Ramanpreet Kaur, Biswajit Paul, Brijesh Kumar, Ram Sagar
A study of the long term evolution of quasi periodic oscillations in the accretion powered X-ray pulsar 4U 1626-67
14 pages, 3 figures. Accepted for publication in ApJ
null
10.1086/529130
null
astro-ph
null
We report here a study of the long term properties of Quasi Periodic Oscillations (QPO) in an unusual accreting X-ray pulsar, 4U 1626--67. This is a unique accretion powered X-ray pulsar in which we have found the QPOs to be present during all sufficiently long X-ray observations with a wide range of X-ray observatories. In the present spin-down era of this source, the QPO central frequency is found to be decreasing. In the earlier spin-up era of this source, there are only two reports of QPO detections, in 1983 with EXOSAT and 1988 with GINGA with an increasing trend. The QPO frequency evolution in 4U 1626--67 during the last 22 years changed from a positive to a negative trend, somewhat coincident with the torque reversal in this source. In the accretion powered X-ray pulsars, the QPO frequency is directly related to the inner radius of the accretion disk, as per Keplerian Frequency Model (KFM) and Beat Frequency Model (BFM). A gradual depletion of accretion disk is reported earlier from the X-ray spectral, flux and pulse profile measurements. The present QPO frequency evolution study shows that X-ray flux and mass accretion rate may not change by the same factor, hence the simple KFM and BFM are not able to explain the QPO evolution in this source. This is the only X-ray pulsar to show persistent QPOs and is also the first accreting X-ray pulsar in which the QPO history is reported for a long time scale relating it with the long term evolution of the accretion disk.
[ { "version": "v1", "created": "Fri, 11 Jan 2008 11:56:02 GMT" } ]
2009-11-13T00:00:00
[ [ "Kaur", "Ramanpreet", "" ], [ "Paul", "Biswajit", "" ], [ "Kumar", "Brijesh", "" ], [ "Sagar", "Ram", "" ] ]
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801.1762
Tzu Chiang Yuan
Kingman Cheung, Thomas W. Kephart, Wai-Yee Keung, and Tzu-Chiang Yuan
Decay of Z Boson into Photon and Unparticle
12 pages, 2 figures plus 1 table
Phys.Lett.B662:436-440,2008
10.1016/j.physletb.2008.03.037
null
hep-ph
null
We study the decay of the standard model Z boson into unparticle plus a single photon through a one-loop process. As in the anomaly type decay, only the axial-vector part of the Z coupling matching with the vector unparticle and/or the vector part of the Z coupling matching with the axial-vector unparticle can give a nonzero contribution to the decay. We show that the photon spectrum terminates at the end point in accord with Yang's theorem. Existing data on single photon production at LEP I is used to constrain the unparticle sector.
[ { "version": "v1", "created": "Fri, 11 Jan 2008 12:06:27 GMT" } ]
2010-10-27T00:00:00
[ [ "Cheung", "Kingman", "" ], [ "Kephart", "Thomas W.", "" ], [ "Keung", "Wai-Yee", "" ], [ "Yuan", "Tzu-Chiang", "" ] ]
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801.1763
Binoy Talukdar None
Amitava Choudhuri, B. Talukdar and U. Das
Modified KdV hierarchy : Lax pair representation and bi-Hamiltonian structure
8 pages, 2 figures
Z. Naturforsch, 64a, 171-179 (2008)
10.1515/zna-2009-3-403
null
nlin.SI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider equations in the modified KdV (mKdV) hierarchy and make use of the Miura transformation to construct expressions for their Lax pair. We derive a Lagrangian-based approach to study the bi-Hamiltonian structure of the mKdV equations. We also show that the complex modified KdV (cmKdV) equation follows from the action principle to have a Lagrangian representation. This representation not only provides a basis to write the cmKdV equation in the canonical form endowed with an appropriate Poisson structure but also help us construct a semianalytical solution of it. The solution obtained by us may serve as a useful guide for purely numerical routines which are currently being used to solve the cmKdV eqution.
[ { "version": "v1", "created": "Fri, 11 Jan 2008 12:14:25 GMT" }, { "version": "v2", "created": "Fri, 9 Oct 2009 08:20:49 GMT" } ]
2015-05-13T00:00:00
[ [ "Choudhuri", "Amitava", "" ], [ "Talukdar", "B.", "" ], [ "Das", "U.", "" ] ]
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801.1764
Iosif Khriplovich
I.B. Khriplovich, A.A. Pomeransky
Does Cosmological Term Influence Gravitational Lensing?
5 pages, 1 figure
Int.J.Mod.Phys.D17:2255-2259,2008
10.1142/S0218271808013832
null
gr-qc astro-ph
null
We analyze the bending of light by galaxies or clusters of galaxies in the presence of the cosmological term. Going over to the Friedmann-Robertson-Walker coordinates, used in fact for the description of actual observations, we demonstrate that the cosmological constant does not influence practically the lensing effect.
[ { "version": "v1", "created": "Fri, 11 Jan 2008 12:15:52 GMT" } ]
2009-02-11T00:00:00
[ [ "Khriplovich", "I. B.", "" ], [ "Pomeransky", "A. A.", "" ] ]
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801.1765
Matthias Troyer
A.F. Albuquerque, F. Alet, P. Corboz, P. Dayal, A. Feiguin, S. Fuchs, L. Gamper, E. Gull, S. Guertler, A. Honecker, R. Igarashi, M. Koerner, A. Kozhevnikov, A. Laeuchli, S.R. Manmana, M. Matsumoto, I.P. McCulloch, F. Michel, R.M. Noack, G. Pawlowski, L. Pollet, T. Pruschke, U. Schollwock, S. Todo, S. Trebst, M. Troyer, P. Werner, S. Wessel (for the ALPS collaboration)
The ALPS project release 1.3: open source software for strongly correlated systems
null
Journal of Magnetism and Magnetic Materials 310, 1187 (2007)
10.1016/j.jmmm.2006.10.304
null
cond-mat.str-el cond-mat.stat-mech
null
We present release 1.3 of the ALPS (Algorithms and Libraries for Physics Simulations) project, an international open source software project to develop libraries and application programs for the simulation of strongly correlated quantum lattice models such as quantum magnets, lattice bosons, and strongly correlated fermion systems. Development is centered on common XML and binary data formats, on libraries to simplify and speed up code development, and on full-featured simulation programs. The programs enable non-experts to start carrying out numerical simulations by providing basic implementations of the important algorithms for quantum lattice models: classical and quantum Monte Carlo (QMC) using non-local updates, extended ensemble simulations, exact and full diagonalization (ED), as well as the density matrix renormalization group (DMRG). Changes in the new release include a DMRG program for interacting models, support for translation symmetries in the diagonalization programs, the ability to define custom measurement operators, and support for inhomogeneous systems, such as lattice models with traps. The software is available from our web server at http://alps.comp-phys.org/ .
[ { "version": "v1", "created": "Fri, 11 Jan 2008 12:18:09 GMT" } ]
2008-01-14T00:00:00
[ [ "Albuquerque", "A. F.", "", "for the ALPS collaboration" ], [ "Alet", "F.", "", "for the ALPS collaboration" ], [ "Corboz", "P.", "", "for the ALPS collaboration" ], [ "Dayal", "P.", "", "for the ALPS collaboration" ], [ "Feiguin", "A.", "", "for the ALPS collaboration" ], [ "Fuchs", "S.", "", "for the ALPS collaboration" ], [ "Gamper", "L.", "", "for the ALPS collaboration" ], [ "Gull", "E.", "", "for the ALPS collaboration" ], [ "Guertler", "S.", "", "for the ALPS collaboration" ], [ "Honecker", "A.", "", "for the ALPS collaboration" ], [ "Igarashi", "R.", "", "for the ALPS collaboration" ], [ "Koerner", "M.", "", "for the ALPS collaboration" ], [ "Kozhevnikov", "A.", "", "for the ALPS collaboration" ], [ "Laeuchli", "A.", "", "for the ALPS collaboration" ], [ "Manmana", "S. R.", "", "for the ALPS collaboration" ], [ "Matsumoto", "M.", "", "for the ALPS collaboration" ], [ "McCulloch", "I. P.", "", "for the ALPS collaboration" ], [ "Michel", "F.", "", "for the ALPS collaboration" ], [ "Noack", "R. M.", "", "for the ALPS collaboration" ], [ "Pawlowski", "G.", "", "for the ALPS collaboration" ], [ "Pollet", "L.", "", "for the ALPS collaboration" ], [ "Pruschke", "T.", "", "for the ALPS collaboration" ], [ "Schollwock", "U.", "", "for the ALPS collaboration" ], [ "Todo", "S.", "", "for the ALPS collaboration" ], [ "Trebst", "S.", "", "for the ALPS collaboration" ], [ "Troyer", "M.", "", "for the ALPS collaboration" ], [ "Werner", "P.", "", "for the ALPS collaboration" ], [ "Wessel", "S.", "", "for the ALPS collaboration" ] ]
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801.1766
Pinyan Lu
Jin-Yi Cai, Pinyan Lu and Mingji Xia
A Family of Counter Examples to an Approach to Graph Isomorphism
null
null
null
null
cs.CC cs.DM
null
We give a family of counter examples showing that the two sequences of polytopes $\Phi_{n,n}$ and $\Psi_{n,n}$ are different. These polytopes were defined recently by S. Friedland in an attempt at a polynomial time algorithm for graph isomorphism.
[ { "version": "v1", "created": "Fri, 11 Jan 2008 12:28:05 GMT" }, { "version": "v2", "created": "Sat, 12 Jan 2008 10:12:53 GMT" } ]
2008-01-14T00:00:00
[ [ "Cai", "Jin-Yi", "" ], [ "Lu", "Pinyan", "" ], [ "Xia", "Mingji", "" ] ]
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801.1767
Aldo Dall'Aglio
Aldo Dall'Aglio, Lutz Wisotzki, Gabor Worseck (Astrophysikalisches Institut Potsdam)
The line-of-sight proximity effect in individual quasar spectra
A&A accepted for publication, 14 pages, 24 figures (including 17 online figures)
null
10.1051/0004-6361:20077088
null
astro-ph
null
We exploit a set of high signal-to-noise (~70), low-resolution (R~800) quasar spectra to search for the signature of the so-called proximity effect in the HI Ly alpha forest. Our sample consists of 17 bright quasars in the redshift range 2.7<z<4.1. Analysing the spectra with the flux transmission technique, we detect the proximity effect in the sample at high significance. We use this to estimate the average intensity of the metagalactic UV background, assuming it to be constant over this redshift range. We obtain a value of J = (9+-4)x10^{-22}ergcm^{-2}s^{-1}Hz^{-1}sr^{-1}, in good agreement with previous measurements at similar z. We then apply the same procedure to individual lines of sight, finding a significant deficit in the effective optical depth close to the emission redshift in every single object except one (which by a different line of evidence does nevertheless show a noticeable proximity effect). Thus, we clearly see the proximity effect as a universal phenomenon associated with individual quasars. Using extensive Monte-Carlo simulations to quantify the error budget, we assess the expected statistical scatter in the strength of the proximity effect due to shot noise (cosmic variance). The observed scatter is larger than the predicted one, so that additional sources of scatter are required. We rule out a dispersion of spectral slopes as a significant contributor. Possible effects are long time-scale variability of the quasars and/or gravitational clustering of Ly alpha forest lines. We speculate on the possibility of using the proximity effect as a tool to constrain individual quasar ages, finding that ages between ~10^6 and ~10^8 yrs might produce a characteristic signature in the optical depth profile towards the QSO. We identify one possible candidate for this effect in our sample.
[ { "version": "v1", "created": "Fri, 11 Jan 2008 12:41:20 GMT" }, { "version": "v2", "created": "Fri, 18 Jan 2008 08:38:19 GMT" } ]
2009-11-13T00:00:00
[ [ "Dall'Aglio", "Aldo", "", "Astrophysikalisches\n Institut Potsdam" ], [ "Wisotzki", "Lutz", "", "Astrophysikalisches\n Institut Potsdam" ], [ "Worseck", "Gabor", "", "Astrophysikalisches\n Institut Potsdam" ] ]
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801.1768
Luciano Lapas Calheiros
Agustin P\'erez-Madrid, Jos\'e M. Rub\'i, and Luciano C. Lapas
Heat transfer between nanoparticles: Thermal conductance for near-field interactions
null
Phys. Rev. B 77, 155417 (2008)
10.1103/PhysRevB.77.155417
null
cond-mat.mtrl-sci cond-mat.mes-hall
null
We analyze the heat transfer between two nanoparticles separated by a distance lying in the near-field domain in which energy interchange is due to Coulomb interactions. The thermal conductance is computed by assuming that the particles have charge distributions characterized by fluctuating multipole moments in equilibrium with heat baths at two different temperatures. This quantity follows from the fluctuation-dissipation theorem (FDT) for the fluctuations of the multipolar moments. We compare the behavior of the conductance as a function of the distance between the particles with the result obtained by means of molecular dynamics simulations. The formalism proposed enables us to provide a comprehensive explanation of the marked growth of the conductance when decreasing the distance between the nanoparticles.
[ { "version": "v1", "created": "Fri, 11 Jan 2008 12:32:23 GMT" } ]
2008-04-18T00:00:00
[ [ "Pérez-Madrid", "Agustin", "" ], [ "Rubí", "José M.", "" ], [ "Lapas", "Luciano C.", "" ] ]
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801.1769
Antonio Pipino
Antonio Pipino (Astrophysics, Oxford University, UK), Francesca Matteucci (Dipartimento di Astronomia, Universita'di Trieste, Italy) and Thomas H. Puzia (Herzberg Institute of Astrophysics, Canada)
Stars, gas and dust in elliptical galaxies
12 pages, 4 figures, to appear on the proceedings of "XIXemes Rencontres de Blois"
null
null
null
astro-ph
null
I will present recent theoretical results on the formation and the high redshift assembly of spheroids. These findings have been obtained by utilising different and complementary techniques: chemodynamical models offer great insight in the radial abundance gradients in the stars; while state semi-analytic codes implementing a detailed treatment of the chemical evolution allow an exploration of the role of the galactic mass in shaping many observed relations. The results will be shown by following the path represented by the evolution of the mass-metallicity relation in stars, gas and dust. I will show how, under a few sensible assumptions, it is possible to reproduce a large number of observables ranging from the Xrays to the Infrared. By comparing model predictions with observations, we derive a picture of galaxy formation in which the higher is the mass of the galaxy, the shorter are the infall and the star formation timescales. Therefore, the stellar component of the most massive and luminous galaxies might attain a metallicity Z > Z_sun in only 0.5 Gyr. Each galaxy is created outside-in, i.e. the outermost regions accrete gas, form stars and develop a galactic wind very quickly, compared to the central core in which the star formation can last up to ~ 1.3 Gyr.
[ { "version": "v1", "created": "Fri, 11 Jan 2008 12:49:10 GMT" } ]
2008-01-14T00:00:00
[ [ "Pipino", "Antonio", "", "Astrophysics, Oxford University, UK" ], [ "Matteucci", "Francesca", "", "Dipartimento di Astronomia, Universita'di Trieste, Italy" ], [ "Puzia", "Thomas H.", "", "Herzberg Institute of Astrophysics, Canada" ] ]
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801.177
Vincent Tatischeff
V. Tatischeff and M. Hernanz
Evidence for Nonlinear Diffusive Shock Acceleration of Cosmic Rays in the 2006 Outburst of RS Ophiuchi
4 pages, 2 figures. To appear in "RS Ophiuchi (2006) and the recurrent nova phenomenon", eds. A. Evans, M.F. Bode & T.J. O'Brien, ASP Conf. Ser
null
null
null
astro-ph
null
Spectroscopic observations of the 2006 outburst of RS Oph at both infrared (IR) and X-ray wavelengths have shown that the blast wave has decelerated at a higher rate than predicted by the standard test-particle adiabatic shock-wave model. The observed blast-wave evolution can be explained, however, by the diffusive shock acceleration of particles at the forward shock and the subsequent escape of the highest energy ions from the acceleration region. Nonlinear particle acceleration can also account for the difference of shock velocities deduced from the IR and X-ray data. We discuss the evolution of the nova remnant in the light of efficient particle acceleration at the blast wave.
[ { "version": "v1", "created": "Fri, 11 Jan 2008 12:45:52 GMT" } ]
2008-01-14T00:00:00
[ [ "Tatischeff", "V.", "" ], [ "Hernanz", "M.", "" ] ]
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801.1771
Malgorzata Krolikowska
Malgorzata Krolikowska and Grzegorz Sitarski
Asteroid 2007 WD5 will not impact Mars on January 30!
7 pages
null
null
null
astro-ph
null
The Monte Carlo method of the nominal orbit clonning was applied to the case of 2007 WD5, the asteroid from the Apollo group. Calculations based on 33 observations from the time interval of 2007 11 08 - 2008 01 02 showed that the asteroid will pass near planet Mars at the minimum distance of 10.9\pm 2.9 R_{Mars}, what implies that probability that 2007 WD5 strike the planet decreased to the value of 0.03% from the value of about 3--4% previously announced by NASA. The additional observations taken on January 3--9 reduce further the asteroid's impact chances, effectively to nil: the asteroid will pass near planet Mars at the minimum distance of 8.4\pm 1.1 R_{Mars}.
[ { "version": "v1", "created": "Fri, 11 Jan 2008 12:46:45 GMT" } ]
2008-01-14T00:00:00
[ [ "Krolikowska", "Malgorzata", "" ], [ "Sitarski", "Grzegorz", "" ] ]
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801.1772
Veronika Rehn-Sonigo
Anne Benoit (INRIA Rh\^one-Alpes, LIP), Harald Kosch, Veronika Rehn-Sonigo (INRIA Rh\^one-Alpes, LIP), Yves Robert (INRIA Rh\^one-Alpes, LIP)
Bi-criteria Pipeline Mappings for Parallel Image Processing
null
null
null
null
cs.DC
null
Mapping workflow applications onto parallel platforms is a challenging problem, even for simple application patterns such as pipeline graphs. Several antagonistic criteria should be optimized, such as throughput and latency (or a combination). Typical applications include digital image processing, where images are processed in steady-state mode. In this paper, we study the mapping of a particular image processing application, the JPEG encoding. Mapping pipelined JPEG encoding onto parallel platforms is useful for instance for encoding Motion JPEG images. As the bi-criteria mapping problem is NP-complete, we concentrate on the evaluation and performance of polynomial heuristics.
[ { "version": "v1", "created": "Fri, 11 Jan 2008 14:48:43 GMT" } ]
2008-01-14T00:00:00
[ [ "Benoit", "Anne", "", "INRIA Rhône-Alpes, LIP" ], [ "Kosch", "Harald", "", "INRIA Rhône-Alpes, LIP" ], [ "Rehn-Sonigo", "Veronika", "", "INRIA Rhône-Alpes, LIP" ], [ "Robert", "Yves", "", "INRIA Rhône-Alpes,\n LIP" ] ]
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