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801.2173
Simon Caron-Huot
Simon Caron-Huot, Guy D. Moore
Heavy quark diffusion in QCD and N=4 SYM at next-to-leading order
40 pages, 14 figures
JHEP 0802:081,2008
10.1088/1126-6708/2008/02/081
null
hep-ph
null
We present the full details of a calculation at next-to-leading order of the momentum diffusion coefficient of a heavy quark in a hot, weakly coupled, QCD plasma. Corrections arise at O(g_s); physically they represent interference between overlapping scatterings, as well as soft, electric scale (p ~ gT) gauge field physics, which we treat using the hard thermal loop (HTL) effective theory. In 3-color, 3-flavor QCD, the momentum diffusion constant of a fundamental representation heavy quark at NLO is kappa = (16\pi/3) alpha_s^2 T^3 (log(1/g) + 0.07428 + 1.9026 g). We extend the computation to a heavy fundamental representation ``probe'' quark in large N_c, N=4 Super Yang-Mills theory, where the result is kappa^{SYM}= (lambda^2 T^3)(6\pi) (log(1/\sqrt{\lambda}) + 0.4304 + 0.8010 \sqrt{lambda}) (where lambda=g_s^2 N_c is the t'Hooft coupling). In the absence of some resummation technique, the convergence of perturbation theory is poor.
[ { "version": "v1", "created": "Mon, 14 Jan 2008 22:30:36 GMT" } ]
2014-11-18T00:00:00
[ [ "Caron-Huot", "Simon", "" ], [ "Moore", "Guy D.", "" ] ]
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801.2174
Ivan Gonzalez
I. Gonzalez, S. Okamoto, S. Yunoki, A. Moreo and E. Dagotto
Charge transfer in heterostructures of strongly correlated materials
14 pages, 9 figures. Invited article for a special issue of JPCM on Metal Oxide Thin Films; minor changes in the text
null
10.1088/0953-8984/20/26/264002
null
cond-mat.str-el
null
In this manuscript, recent theoretical investigations by the authors in the area of oxide multilayers are briefly reviewed. The calculations were carried out using model Hamiltonians and a variety of non-perturbative techniques. Moreover, new results are also included here. They correspond to the generation of a metallic state by mixing insulators in a multilayer geometry, using the Hubbard and Double Exchange models. For the latter, the resulting metallic state is also ferromagnetic. This illustrates how electron or hole doping via transfer of charge in multilayers can lead to the study of phase diagrams of transition metal oxides in the clean limit. Currently, these phase diagrams are much affected by the disordering standard chemical doping procedure, which introduces quenched disorder in the material.
[ { "version": "v1", "created": "Mon, 14 Jan 2008 22:26:34 GMT" }, { "version": "v2", "created": "Fri, 18 Jan 2008 02:11:30 GMT" } ]
2009-11-13T00:00:00
[ [ "Gonzalez", "I.", "" ], [ "Okamoto", "S.", "" ], [ "Yunoki", "S.", "" ], [ "Moreo", "A.", "" ], [ "Dagotto", "E.", "" ] ]
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801.2175
Johannes Gro{\ss}e
Johannes Gro{\ss}e
MathPSfrag 2: Convenient LaTeX Labels in Mathematica
9 pages, package can be found at http://wwwth.mppmu.mpg.de/members/jgrosse/mathpsfrag/
null
null
null
cs.GR
null
This article introduces the next version of MathPSfrag. MathPSfrag is a Mathematica package that during export automatically replaces all expressions in a plot by corresponding LaTeX commands. The new version can also produce LaTeX independent images; e.g., PDF files for inclusion in pdfLaTeX. Moreover from these files a preview is generated and shown within Mathematica.
[ { "version": "v1", "created": "Tue, 15 Jan 2008 18:34:44 GMT" } ]
2008-01-16T00:00:00
[ [ "Große", "Johannes", "" ] ]
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801.2176
Marcelo Loewe
Marcelo Loewe and Cristian Mart\'inez V
Thermal Corrections to $\pi$-$\pi$ Scattering Lengths in the Linear Sigma Model
8 pages. Keywords: Finite temperature field theory; scattering lengths; linear sigma model. A new reference has been added. Written in RevTex4. The paper is being accepted for publication in Phys. Rev. D. The size of the manuscript was reduced considerably
Phys.Rev.D77:105006,2008; Erratum-ibid.D78:069902,2008
10.1103/PhysRevD.77.105006 10.1103/PhysRevD.78.069902
null
hep-ph
null
In this article we explore the thermal evolution of the $\pi$-$\pi$ scattering lengths in the frame of the linear sigma model. We compute, using thermofield dynamics, all the one loop diagrams that contribute to $\pi$-$\pi$ scattering. We restrict ourselves to temperature correction only in the pion sector, due to the Boltzmann supression for the sigma meson. From this analysis we obtain the thermal behavior of $a_0^0$ and $a_0^2$, s-waves scattering lengths in the isospin channel I=0 and I=2 respectively. It turns out that $a_0^0$ grows whereas $a_0^2$ diminishes as function of temperature. We compare our results with other determinations of the thermal behavior of these magnitudes.
[ { "version": "v1", "created": "Mon, 14 Jan 2008 22:38:44 GMT" }, { "version": "v2", "created": "Fri, 18 Jan 2008 00:56:18 GMT" }, { "version": "v3", "created": "Wed, 23 Jan 2008 21:57:46 GMT" }, { "version": "v4", "created": "Thu, 27 Mar 2008 20:38:44 GMT" } ]
2014-11-18T00:00:00
[ [ "Loewe", "Marcelo", "" ], [ "Martínez", "Cristian", "V" ] ]
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801.2177
N. J. Turner
N. J. Turner, K. Grogan and J. B. Breckinridge
Probing Interstellar Dust With Space-Based Coronagraphs
Accepted for publication in ApJ Supplements
null
10.1086/587061
null
astro-ph
null
We show that space-based telescopes such as the proposed Terrestrial Planet Finder Coronagraph will be able to detect the light scattered by the interstellar grains along lines of sight passing near stars in our Galaxy. The relative flux of the scattered light within one arcsecond of a star at 100 pc in a uniform interstellar medium of 0.1 H atoms cm^-3 is about 10^-7. The halo increases in strength with the distance to the star and is unlikely to limit the coronagraphic detection of planets around the nearest stars. Grains passing within 100 AU of Sun-like stars are deflected by radiation, gravity and magnetic forces, leading to features in the scattered light that can potentially reveal the strength of the stellar wind, the orientation of the stellar magnetic field and the relative motion between the star and the surrounding interstellar medium.
[ { "version": "v1", "created": "Mon, 14 Jan 2008 22:59:41 GMT" } ]
2009-11-13T00:00:00
[ [ "Turner", "N. J.", "" ], [ "Grogan", "K.", "" ], [ "Breckinridge", "J. B.", "" ] ]
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801.2178
Elena Orlando
Elena Orlando, Andrew W. Strong
Gamma-ray emission from the solar halo and disk: a study with EGRET data
Corrected typos, added acknowledgements. A&A in press
Astron.Astrophys.480:847,2008
10.1051/0004-6361:20078817
null
astro-ph
null
Context: The Sun has recently been predicted to be an extended source of gamma-ray emission, produced by inverse-Compton (IC) scattering of cosmic-ray (CR) electrons on the solar radiation field. The emission was predicted to be extended and a confusing foreground for the diffuse extragalactic background even at large angular distances from the Sun. The solar disk is also expected to be a steady gamma-ray source. While these emissions are expected to be readily detectable in the future by GLAST, the situation for available EGRET data is more challenging. Aims: The theory of gamma-ray emission from IC scattering on the solar radiation field by Galactic CR electrons is given in detail. This is used as the basis for detection and model verification using EGRET data. Methods: We present a detailed study of the solar emission using the EGRET database, accounting for the effect of the emission from 3C 279, the moon, and other sources, which interfere with the solar emission. The analysis was performed for 2 energy ranges, above 300 MeV and for 100-300 MeV, as well as for the combination to improve the detection statistics. The technique was tested on the moon signal, with our results consistent with previous work. Results: Analyzing the EGRET database, we find evidence of emission from the solar disk and its halo. The observations are compared with our model for the extended emission. The spectrum of the solar disk emission and the spectrum of the extended emission have been obtained. The spectrum of the moon is also given. Conclusions: The observed intensity distribution and the flux are consistent with the predicted model of IC gamma-rays from the halo around the Sun.
[ { "version": "v1", "created": "Mon, 14 Jan 2008 23:07:31 GMT" }, { "version": "v2", "created": "Sun, 10 Feb 2008 16:20:01 GMT" } ]
2009-06-23T00:00:00
[ [ "Orlando", "Elena", "" ], [ "Strong", "Andrew W.", "" ] ]
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801.2179
Terence C. Tao
Tim Austin, Terence Tao
On the testability and repair of hereditary hypergraph properties
84 pages, 3 figures, to appear, Random Structures and Algorithms. Referee recommendations incorporated (in particular, a longer introduction)
null
null
null
math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Recent works of Alon-Shapira and R\"odl-Schacht have demonstrated that every hereditary property of undirected graphs or hypergraphs is testable with one-sided error; informally, this means that if a graph or hypergraph satisfies that property "locally" with sufficiently high probability, then it can be perturbed (or "repaired") into a graph or hypergraph which satisfies that property "globally". In this paper we make some refinements to these results, some of which may be surprising. In the positive direction, we strengthen the results to cover hereditary properties of multiple directed polychromatic graphs and hypergraphs. In the case of undirected graphs, we extend the result to continuous graphs on probability spaces, and show that the repair algorithm is "local" in the sense that it only depends on a bounded amount of data; in particular, the graph can be repaired in a time linear in the number of edges. We also show that local repairability also holds for monotone or partite hypergraph properties (this latter result is also implicitly in work of Ishigami). In the negative direction, we show that local repairability breaks down for directed graphs, or for undirected 3-uniform hypergraphs. The reason for this contrast in behavior stems from (the limitations of) Ramsey theory.
[ { "version": "v1", "created": "Mon, 14 Jan 2008 23:07:48 GMT" }, { "version": "v2", "created": "Tue, 12 May 2009 06:27:25 GMT" } ]
2009-05-12T00:00:00
[ [ "Austin", "Tim", "" ], [ "Tao", "Terence", "" ] ]
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801.218
Mikhail Skvortsov
D. A. Ivanov and M. A. Skvortsov
Dyson-Maleev representation of nonlinear sigma-models
16 pages, 1 figure
J.Phys.A41:215003,2008
10.1088/1751-8113/41/21/215003
null
cond-mat.mes-hall cond-mat.dis-nn
null
For nonlinear sigma-models in the unitary symmetry class, the non-linear target space can be parameterized with cubic polynomials. This choice of coordinates has been known previously as the Dyson-Maleev parameterization for spin systems, and we show that it can be applied to a wide range of sigma-models. The practical use of this parameterization includes simplification of diagrammatic calculations (in perturbative methods) and of algebraic manipulations (in non-perturbative approaches). We illustrate the use and specific issues of the Dyson-Maleev parameterization with three examples: the Keldysh sigma-model for time-dependent random Hamiltonians, the supersymmetric sigma-model for random matrices, and the supersymmetric transfer-matrix technique for quasi-one-dimensional disordered wires. We demonstrate that nonlinear sigma-models of unitary-like symmetry classes C and B/D also admit the Dyson-Maleev parameterization.
[ { "version": "v1", "created": "Mon, 14 Jan 2008 23:22:44 GMT" } ]
2008-11-26T00:00:00
[ [ "Ivanov", "D. A.", "" ], [ "Skvortsov", "M. A.", "" ] ]
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801.2181
Daniel Silevitch
C. Ancona-Torres, D. M. Silevitch, G. Aeppli, T. F. Rosenbaum
Quantum and Classical Glass Transitions in $Li Ho_x Y_{1-x} F_4$
5 pages, 5 figures. Updated figure 3 with corrected calibration information for thermometry
Phys. Rev. Lett. 101, 057201 (2008)
10.1103/PhysRevLett.101.057201
null
cond-mat.dis-nn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
When performed in the proper low field, low frequency limits, measurements of the dynamics and the nonlinear susceptibility in the model Ising magnet in transverse field, $\text{LiHo}_x\text{Y}_{1-x}\text{F}_4$, prove the existence of a spin glass transition for $x$ = 0.167 and 0.198. The classical behavior tracks for the two concentrations, but the behavior in the quantum regime at large transverse fields differs because of the competing effects of quantum entanglement and random fields.
[ { "version": "v1", "created": "Tue, 15 Jan 2008 15:11:04 GMT" }, { "version": "v2", "created": "Wed, 16 Jan 2008 18:34:46 GMT" }, { "version": "v3", "created": "Wed, 23 Jan 2008 14:28:57 GMT" }, { "version": "v4", "created": "Mon, 26 Oct 2009 19:33:31 GMT" } ]
2009-10-26T00:00:00
[ [ "Ancona-Torres", "C.", "" ], [ "Silevitch", "D. M.", "" ], [ "Aeppli", "G.", "" ], [ "Rosenbaum", "T. F.", "" ] ]
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801.2182
Fabio D. A. Aarao Reis
R. B. Stinchcombe, F. D. A. Aar\~ao Reis
Modeling one-dimensional island growth with mass-dependent detachment rates
16 pages, 6 figures
Published in Phys. Rev. B 77, 035406 (2008)
10.1103/PhysRevB.77.035406
null
cond-mat.stat-mech cond-mat.mtrl-sci
null
We study one-dimensional models of particle diffusion and attachment/detachment from islands where the detachment rates gamma(m) of particles at the cluster edges increase with cluster mass m. They are expected to mimic the effects of lattice mismatch with the substrate and/or long-range repulsive interactions that work against the formation of long islands. Short-range attraction is represented by an overall factor epsilon<<1 in the detachment rates relatively to isolated particle hopping rates [epsilon ~ exp(-E/T), with binding energy E and temperature T]. We consider various gamma(m), from rapidly increasing forms such as gamma(m) ~ m to slowly increasing ones, such as gamma(m) ~ [m/(m+1)]^b. A mapping onto a column problem shows that these systems are zero-range processes, whose steady states properties are exactly calculated under the assumption of independent column heights in the Master equation. Simulation provides island size distributions which confirm analytic reductions and are useful whenever the analytical tools cannot provide results in closed form. The shape of island size distributions can be changed from monomodal to monotonically decreasing by tuning the temperature or changing the particle density rho. Small values of the scaling variable X=epsilon^{-1}rho/(1-rho) favour the monotonically decreasing ones. However, for large X, rapidly increasing gamma(m) lead to distributions with peaks very close to <m> and rapidly decreasing tails, while slowly increasing gamma(m) provide peaks close to <m>/2$ and fat right tails.
[ { "version": "v1", "created": "Mon, 14 Jan 2008 23:12:37 GMT" } ]
2009-11-13T00:00:00
[ [ "Stinchcombe", "R. B.", "" ], [ "Reis", "F. D. A. Aarão", "" ] ]
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801.2183
Rudolph C. Hwa
Charles B. Chiu, Rudolph C. Hwa and C. B. Yang
Azimuthal Anisotropy: Ridges, Recombination and Breaking of Quark Number Scaling
17 pages including 13 figures. This is a revised version with additional material and author
null
10.1103/PhysRevC.78.044903
null
nucl-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Azimuthal anisotropy is studied by taking into account the ridges created by semi-hard scattering, which is sensitive to the initial spatial configuration in non-central heavy-ion collisions. No rapid thermalization is required. Although hydrodynamics is not used in this study, the validity of hydrodynamical expansion is not excluded at later time after equilibration is achieved. Phenomenological properties of the bulk and ridge behaviors are used as inputs to determine the elliptic flow of pion and proton at low p_T. At intermediate p_T the recombination of shower partons with thermal partons becomes more important. The phi dependence arises from the variation of the in-medium path length of the hard parton that generates the shower. The p_T dependence of v_2 is therefore very different at intermediate p_T compared to that at low p_T. Quark number scaling of v_2 is shown to be only approximately valid at low p_T, but is broken at intermediate p_T, even though recombination is the mechanism of hadronization in all p_T regions considered.
[ { "version": "v1", "created": "Mon, 14 Jan 2008 23:27:39 GMT" }, { "version": "v2", "created": "Fri, 10 Oct 2008 21:21:22 GMT" } ]
2009-11-13T00:00:00
[ [ "Chiu", "Charles B.", "" ], [ "Hwa", "Rudolph C.", "" ], [ "Yang", "C. B.", "" ] ]
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801.2184
D. N. Matsukevich
D. N. Matsukevich, P. Maunz, D. L. Moehring, S. Olmschenk and C. Monroe
Bell inequality violation with two remote atomic qubits
4 pages, 4 figures
Phys. Rev. Lett. 100, 150404 (2008)
10.1103/PhysRevLett.100.150404
null
quant-ph
null
We observe violation of a Bell inequality between the quantum states of two remote Yb ions separated by a distance of about one meter with the detection loophole closed. The heralded entanglement of two ions is established via interference and joint detection of two emitted photons, whose polarization is entangled with each ion. The entanglement of remote qubits is also characterized by full quantum state tomography.
[ { "version": "v1", "created": "Mon, 14 Jan 2008 23:35:12 GMT" } ]
2008-05-20T00:00:00
[ [ "Matsukevich", "D. N.", "" ], [ "Maunz", "P.", "" ], [ "Moehring", "D. L.", "" ], [ "Olmschenk", "S.", "" ], [ "Monroe", "C.", "" ] ]
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801.2185
Xiaohu Shang
Xiaohu Shang, Gerhard Kramer, Biao Chen
New Outer Bounds on the Capacity Region of Gaussian Interference Channels
5 pages, 2 figures, submitted to ISIT 2008
null
null
null
cs.IT math.IT
null
Recent outer bounds on the capacity region of Gaussian interference channels are generalized to $m$-user channels with $m>2$ and asymmetric powers and crosstalk coefficients. The bounds are again shown to give the sum-rate capacity for Gaussian interference channels with low powers and crosstalk coefficients. The capacity is achieved by using single-user detection at each receiver, i.e., treating the interference as noise incurs no loss in performance.
[ { "version": "v1", "created": "Mon, 14 Jan 2008 23:48:05 GMT" } ]
2008-01-16T00:00:00
[ [ "Shang", "Xiaohu", "" ], [ "Kramer", "Gerhard", "" ], [ "Chen", "Biao", "" ] ]
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801.2186
Hans J. Deeg
H. J. Deeg (1), B. Oca\~na (1,2), V. P. Kozhevnikov (3), D. Charbonneau (4), F. T. O'Donovan (5), L.R. Doyle (6) ((1) IAC, (2) IRAM, (3) Ural State U., (4) Harvard U., (5) Caltech, (6) SETI)
Extrasolar planet detection by binary stellar eclipse timing: evidence for a third body around CM Draconis
10 pages, 5 figures, accepted by A&A. V2: fixed spelling of one of the authors. V3: fixed error in distance to CM Dra, implying minor changes to several derived numbers
null
10.1051/0004-6361:20079000
null
astro-ph
null
Context: New eclipse minimum timings of the M4.5/M4.5 binary CM Dra were obtained between the years 2000 and 2007. In combination with published timings going back to 1977, a clear non-linearity in observed-minus-calculated (O-C) times has become apparent. Several models are applied to explain the observed timing behavior. Aims: Revealing the processes that cause the observed O-C behavior, and testing the evidence for a third body around the CM Dra system. Methods: The O-C times of the system were fitted against several functions, representing different physical origins of the timing variations. Results: An analysis using model-selection statistics gives about equal weight to a parabolic and to a sinusoidal fitting function. Attraction from a third body, either at large distance in a quasi-constant constellation across the years of observations or from a body on a shorter orbit generating periodicities in O-C times is the most likely source of the observed O-C times. The white dwarf GJ 630.1B, a proper motion companion of CM Dra, can however be rejected as the responsible third body. Also, no further evidence of the short-periodic planet candidate described by Deeg et al. (2000) is found, whereas other mechanisms, such as period changes from stellar winds or Applegate's mechanism can be rejected. Conclusions: A third body, being either a few-Jupiter-mass object with a period of 18.5+-4.5 years or an object in the mass range of 1.5M_jup to 0.1M_sun with periods of hundreds to thousands of years is the most likely origin of the observed minimum timing behavior.
[ { "version": "v1", "created": "Mon, 14 Jan 2008 23:49:56 GMT" }, { "version": "v2", "created": "Wed, 16 Jan 2008 18:50:07 GMT" }, { "version": "v3", "created": "Wed, 13 Feb 2008 15:49:40 GMT" } ]
2009-11-13T00:00:00
[ [ "Deeg", "H. J.", "" ], [ "Ocaña", "B.", "" ], [ "Kozhevnikov", "V. P.", "" ], [ "Charbonneau", "D.", "" ], [ "O'Donovan", "F. T.", "" ], [ "Doyle", "L. R.", "" ] ]
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801.2187
Ephraim Feig
Ephraim Feig, Vivian Feig
A One-Way Function Based On The Extended Euclidean Algorithm
2-page correspondence
null
null
null
cs.CR
null
A problem based on the Extended Euclidean Algorithm applied to a class of polynomials with many factors is presented and believed to be hard. If so, it is a one-way function well suited for applications in digital signicatures.
[ { "version": "v1", "created": "Mon, 14 Jan 2008 23:58:01 GMT" } ]
2008-01-16T00:00:00
[ [ "Feig", "Ephraim", "" ], [ "Feig", "Vivian", "" ] ]
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801.2188
David Sherrington
David Sherrington
A Simple Spin Glass Perspective on Martensitic Shape-memory Alloys
This paper is dedicated to John Pendry in celebration of his 65th birthday. It has been accepted for a special issue of J.Phys.CM. This version corrects a typo, includes a new recent reference and indicates an alternative formulation for 3D
J.Phys.: Condens.Matter 20, 304213 (2008)
10.1088/0953-8984/20/30/304213
null
cond-mat.dis-nn cond-mat.mtrl-sci
null
A brief qualitative mapping is given between austenite, tweed and twinned phases of martensite alloys and corresponding paramagnetic, spin glass and periodic phases in spin glass alloys.
[ { "version": "v1", "created": "Tue, 15 Jan 2008 00:11:18 GMT" }, { "version": "v2", "created": "Tue, 4 Mar 2008 23:54:11 GMT" } ]
2009-11-13T00:00:00
[ [ "Sherrington", "David", "" ] ]
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801.2189
T. Goldman
T. Goldman and R.R. Silbar
The Effect of Pion Exchange in a Relativistic Quark Model of Baryons
31 pp., 8 figs., submitted to Phys Rev C
Phys.Rev.C77:065203,2008
10.1103/PhysRevC.77.065203
LA-UR-08-0168
nucl-th
null
We examine the effect of adding pion exchange between quarks and pion self-energy corrections to the Los Alamos Relativistic Quark model with a short distance cutoff of the Bethe form. The contributions to the nucleon and the Delta-baryon are small. We conclude that the model is stable under this change in the sense that significant changes to the model parameters are not required.
[ { "version": "v1", "created": "Tue, 15 Jan 2008 00:13:12 GMT" } ]
2008-11-26T00:00:00
[ [ "Goldman", "T.", "" ], [ "Silbar", "R. R.", "" ] ]
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801.219
Maciej Bzowski
M. Bzowski (Space Research Centre PAS, Warsaw, Poland)
Survival probability and energy modification of hydrogen Energetic Neutral Atoms on their way from the termination shock to Earth orbit
final version, accepted by A&A, missing figure panels added
null
10.1051/0004-6361:200809393
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Context: With the forthcoming launch of a NASA SMEX mission IBEX devoted to imaging of heliospheric interface by in-situ detection of Energetic Neutral Atoms (ENA) an important issue becomes recognizing of transport of these atoms from the termination shock of the solar wind to Earth orbit. Aims: Investigate modifications of energy and of survival probability of the H ENA detectable by IBEX (0.01 -- 6 keV) between the termination shock and Earth orbit taking into account the influence of the variable and anisotropic solar wind and solar EUV radiation. Methods: Energy change of the atoms is calculated by numerical simulations of orbits of the H ENA atoms from ~100 AU from the Sun down to Earth orbit, taking into account solar gravity and Lyman-$\alpha$ radiation pressure, which is variable in time and depends on radial velocity of the atom. To calculate survival probabilities of the atoms against onization, a detailed 3D and time-dependent model of H ENA ionization based on observations of the solar wind and EUV ionizing radiation is constructed, and wth the use of this model probabilities of survival of the atoms are calculated by numerical integration along the previously calculated orbits. Results: Owing to the radiation pressure, H ENA reach the Earth orbit practically without energy and direction change except the atoms with energy lower than 0.1 keV during high solar activity. For a given energy at Earth orbit one expects fluctuations of survival probability from ~20% at 0.01 keV down to just a few percent at 6 keV and a modulation of survival probability as a function of the location at Earth orbit, ecliptic latitude of the arrival direction, and the phase of solar cycle with an amplitude of a few dozen percent for 0.1 keV atoms at solar minimum to a few percent for 6 keV atoms at solar maximum.
[ { "version": "v1", "created": "Tue, 15 Jan 2008 01:04:49 GMT" }, { "version": "v2", "created": "Wed, 2 Apr 2008 11:41:56 GMT" }, { "version": "v3", "created": "Tue, 3 Jun 2008 11:28:47 GMT" }, { "version": "v4", "created": "Sat, 14 Jun 2008 08:39:06 GMT" } ]
2009-11-13T00:00:00
[ [ "Bzowski", "M.", "", "Space Research Centre PAS, Warsaw, Poland" ] ]
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801.2191
Mikhail Vasiliev a
O.A.Gelfond and M.A.Vasiliev
Higher Spin Fields in Siegel Space, Currents and Theta Functions
LaTeX, 38 pages, v.3: clarifications, acknowledgements and references added, typos corrected, v.4: more comments and references added, typos corrected, the version to appear in JHEP
JHEP 0903:125,2009
10.1088/1126-6708/2009/03/125
FIAN/TD/12-08
hep-th math.DG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Dynamics of four-dimensional massless fields of all spins is formulated in the Siegel space of complex $4\times 4$ symmetric matrices. It is shown that the unfolded equations of free massless fields, that have a form of multidimensional Schrodinger equations, naturally distinguish between positive- and negative-frequency solutions of relativistic field equations, i.e. particles and antiparticles. Multidimensional Riemann theta functions are shown to solve massless field equations in the Siegel space. We establish the correspondence between conserved higher-spin currents in four-dimensional Minkowski space and those in the ten-dimensional matrix space. It is shown that global symmetry parameters of the current in the matrix space should be singular to reproduce a nonzero current in Minkowski space. The $\D$-function integral evolution formulae for 4d massless fields in the Fock-Siegel space are obtained. The generalization of the proposed scheme to higher dimensions and systems of higher ranks is considered.
[ { "version": "v1", "created": "Tue, 15 Jan 2008 01:27:25 GMT" }, { "version": "v2", "created": "Tue, 15 Jan 2008 23:14:48 GMT" }, { "version": "v3", "created": "Fri, 12 Dec 2008 21:45:07 GMT" }, { "version": "v4", "created": "Sun, 29 Mar 2009 22:13:03 GMT" } ]
2009-10-21T00:00:00
[ [ "Gelfond", "O. A.", "" ], [ "Vasiliev", "M. A.", "" ] ]
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801.2192
Laurent Loinard
Laurent Loinard (CRyA-UNAM), Rosa M. Torres (CRyA-UNAM), Amy Mioduszewski (AOC-NRAO), Luis F. Rodriguez (CRyA-UNAM)
A Preliminary VLBA Distance to the Core of Ophiuchus, with an Accuracy of 4%
Changes to title to comply with ApJL style. Paper no published as ApJ 675, L29, 2008
null
10.1096/529548
null
astro-ph
null
The non-thermal 3.6 cm radio continuum emission from the young stars S1 and DoAr21 in the core of Ophiuchus, has been observed with the Very Long Baseline Array (VLBA) at 6 and 7 epochs, respectively, between June 2005 and August 2006. The typical separation between successive observations was 2 to 3 months. Thanks to the remarkably accurate astrometry delivered by the VLBA, the trajectory described by both stars on the plane of the sky could be traced very precisely, and modeled as the superposition of their trigonometric parallax and a uniform proper motion. The best fits yield distances to S1 and DoAr21 of 116.9$^{+7.2}_{-6.4}$ pc and 121.9$^{+5.8}_{-5.3}$ pc, respectively. Combining these results, we estimate the mean distance to the Ophiuchus core to be 120.0$^{+4.5}_{-4.2}$ pc, a value consistent with several recent indirect determinations, but with a significantly improved accuracy of 4%. Both S1 and DoAr21 happen to be members of tight binary systems, but our observations are not frequent enough to properly derive the corresponding orbital parameters. This could be done with additional data, however, and would result in a significantly improved accuracy on the distance determination.
[ { "version": "v1", "created": "Tue, 15 Jan 2008 01:32:32 GMT" }, { "version": "v2", "created": "Fri, 21 Mar 2008 15:01:09 GMT" } ]
2008-03-21T00:00:00
[ [ "Loinard", "Laurent", "", "CRyA-UNAM" ], [ "Torres", "Rosa M.", "", "CRyA-UNAM" ], [ "Mioduszewski", "Amy", "", "AOC-NRAO" ], [ "Rodriguez", "Luis F.", "", "CRyA-UNAM" ] ]
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801.2193
Arnab Das
Arnab Das and Bikas K. Chakrabarti
Quantum Annealing and Analog Quantum Computation
22 pages, 7 figs (color online); new References Added. Reviews of Modern Physics (in press)
Rev. Mod. Phys., 80, 1061 (2008)
10.1103/RevModPhys.80.1061
null
quant-ph cond-mat.stat-mech physics.comp-ph
null
We review here the recent success in quantum annealing, i.e., optimization of the cost or energy functions of complex systems utilizing quantum fluctuations. The concept is introduced in successive steps through the studies of mapping of such computationally hard problems to the classical spin glass problems. The quantum spin glass problems arise with the introduction of quantum fluctuations, and the annealing behavior of the systems as these fluctuations are reduced slowly to zero. This provides a general framework for realizing analog quantum computation.
[ { "version": "v1", "created": "Tue, 15 Jan 2008 01:32:58 GMT" }, { "version": "v2", "created": "Thu, 24 Jan 2008 15:06:41 GMT" }, { "version": "v3", "created": "Mon, 24 Mar 2008 15:42:32 GMT" } ]
2010-09-21T00:00:00
[ [ "Das", "Arnab", "" ], [ "Chakrabarti", "Bikas K.", "" ] ]
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801.2194
Takeshi Oda
T. Oda, T. Totani, N. Yasuda, T. Sumi, T. Morokuma, M. Doi, G. Kosugi
Implications for Galaxy Evolution from the Cosmic Evolution of Supernova Rate Density
15 pages, 8 figures, accepted to PASJ
null
10.1093/pasj/60.2.169
null
astro-ph
null
We report a comprehensive statistical analysis of the observational data of the cosmic evolution of supernova (SN) rate density, to derive constraints on cosmic star formation history and the nature of type Ia supernova (SN Ia) progenitor. We use all available information of magnitude, SN type, and redshift information of both type Ia and core-collapse (CC) SNe in GOODS and SDF, as well as SN Ia rate densities reported in the literature. Furthermore, we also add 157 SN candidates in the past Subaru/Suprime-Cam data that are newly reported here, to increase the statistics. We find that the current data set of SN rate density evolution already gives a meaningful constraint on the evolution of the cosmic star formation rate (SFR) at z <~ 1, though strong constraints cannot be derived for the delay time distribution (DTD) of SNe Ia. We derive a constraint of the evolutionary index of SFR density alpha ~ 3--4 [(1+z)^alpha at z <~ 1] with an evidence for a significant evolution of mean extinction of CC SNe [E(B-V) ~ 0.5 at z ~ 0.5 compared with ~ 0.2 at z = 0], which does not change significantly within a reasonable range of various DTD models. This result is nicely consistent with the systematic trend of alpha estimates based on galactic SFR indicators in different wavelengths (ultraviolet, H_alpha, and infrared), indicating that there is a strong evolution in mean extinction of star forming regions in galaxies at relatively low redshift range of z <~ 0.5. These results are obtained by a method that is completely independent of galaxy surveys, and especially, there is no detection limit about the host galaxy luminosity in our analysis, giving a strong constraint on the star formation activity in high-z dwarf galaxies or intergalactic space.
[ { "version": "v1", "created": "Tue, 15 Jan 2008 02:32:05 GMT" } ]
2015-05-13T00:00:00
[ [ "Oda", "T.", "" ], [ "Totani", "T.", "" ], [ "Yasuda", "N.", "" ], [ "Sumi", "T.", "" ], [ "Morokuma", "T.", "" ], [ "Doi", "M.", "" ], [ "Kosugi", "G.", "" ] ]
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801.2195
Chunbin Yang
L.L. Zhu, H. Zheng and C.B. Yang
Scaling Behavior of Transverse Kinetic Energy Distributions in Au+Au Collisions at $\sqrt{s_{\rm NN}}=200$ GeV
5 pages, 5 eps figures included, to be appeared in Nucl. Phys. A
Nucl.Phys.A802:122-130,2008
10.1016/j.nuclphysa.2008.01.006
null
nucl-th
null
With the experimental data from STAR on the centrality dependence of transverse momentum $p_T$ spectra of pions and protons in Au+Au collisions at $\sqrt{s_{NN}}=200 {\rm GeV}$, we investigate the scaling properties of transverse energy $E_T$ distributions at different centralities. In the framework of cluster formation and decay mechanism for particle production, the universal transverse energy distributions for pion and proton can be described separately but not simultaneously.
[ { "version": "v1", "created": "Tue, 15 Jan 2008 01:50:55 GMT" } ]
2008-11-26T00:00:00
[ [ "Zhu", "L. L.", "" ], [ "Zheng", "H.", "" ], [ "Yang", "C. B.", "" ] ]
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801.2196
Rodolfo Baggio
Rodolfo Baggio
Tourism networks and computer networks
10 pages, 3 figures, 2 tables
null
null
null
physics.soc-ph
null
The body of knowledge accumulated in recent years on the structure and the dynamics of complex networks has offered useful insights on the behaviour of many natural and artificial complex systems. The analysis of some of these, namely those formed by companies and institutions, however, has proved problematical mainly for the difficulties in collecting a reasonable amount of data. This contribution argues that the World Wide Web can provide an efficient and effective way to gather significant samples of networked socio-economic systems to be used for network analyses and simulations. The case discussed refers to a tourism destination, the fundamental subsystem of an industry which can be considered one of the most important in today's World economy.
[ { "version": "v1", "created": "Tue, 15 Jan 2008 02:03:33 GMT" } ]
2008-01-16T00:00:00
[ [ "Baggio", "Rodolfo", "" ] ]
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801.2197
Gerhard Kramm
Gerhard Kramm and Fritz Herbert
Heuristic Derivation of Blackbody Radiation Laws using Principles of Dimensional Analysis
null
null
null
null
math-ph math.MP
null
A generalized form of Wien's displacement law and the blackbody radiation laws of (a) Rayleigh and Jeans, (b) Rayleigh, (c) Wien and Paschen, (d) Thiesen and (e) Planck are derived using principles of dimensional analysis. This kind of scaling is expressed in a strictly mathematical manner employing dimensional pi-invariants analysis sometimes called Buckingham's pi-theorem. It is shown that in the case of the classical radiation law of Rayleigh and Jeans only one pi number occurs that has to be considered as a non-dimensional universal constant. This pi number may be determined theoretically or/and empirically. It is also shown that dimensional pi-invariants analysis yields a generalized form of Wien's displacement law. In this instance two pi numbers generally occur. Consequently, a universal function is established that is indispensable to avoid the so-called Rayleigh-Jeans catastrophe in the ultraviolet. Unfortunately, such a universal function cannot be inferred from dimensional arguments. It has to be derived theoretically or/and empirically, too. It is shown that such a similarity function can be deduced on the basis of heuristic principles, when criteria like the maximum condition regarding the generalized form of Wien's displacement law, the requirement of the power law of Stefan and Boltzmann, and Ehrenfest's arguments regarding the red and the violet requirements are adopted.
[ { "version": "v1", "created": "Tue, 15 Jan 2008 02:12:07 GMT" }, { "version": "v2", "created": "Sat, 22 Mar 2008 01:57:15 GMT" } ]
2008-03-22T00:00:00
[ [ "Kramm", "Gerhard", "" ], [ "Herbert", "Fritz", "" ] ]
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801.2198
Osamu Fujino
Osamu Fujino
Theory of non-lc ideal sheaves -basic properties-
21 pages; v2: mistakes were corrected, v3: the proof of the main theorem was revised, v4: minor modifications, v5: minor revision following referee's comments
Kyoto J. Math. 50, no. 2 (2010), 225-245
10.1215/0023608X-2009-011
null
math.AG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We introduce the notion of non-lc ideal sheaves. It is an analogue of the notion of multiplier ideal sheaves. We establish the restriction theorem, which seems to be the most important property of non-lc ideal sheaves.
[ { "version": "v1", "created": "Tue, 15 Jan 2008 02:40:05 GMT" }, { "version": "v2", "created": "Sun, 11 May 2008 01:25:58 GMT" }, { "version": "v3", "created": "Wed, 11 Mar 2009 05:37:00 GMT" }, { "version": "v4", "created": "Fri, 17 Jul 2009 10:52:33 GMT" }, { "version": "v5", "created": "Sun, 25 Oct 2009 12:51:05 GMT" } ]
2015-01-14T00:00:00
[ [ "Fujino", "Osamu", "" ] ]
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801.2199
Yue-Liang Wu
Jian-Wei Cui and Yue-Liang Wu (KITPC/Itp-Cas)
One-Loop Renormalization of Non-Abelian Gauge Theory and \beta Function Based on Loop Regularization Method
32 pages, 7 figures, references added
Int.J.Mod.Phys.A23:2861-2913,2008
10.1142/S0217751X08040305
null
hep-ph hep-th
null
All one-loop renormalization constants for Non-Abelian gauge theory are computed in details by using the symmetry-preserving Loop Regularization method proposed in\cite{LR1,LR2}. The resulting renormalization constants are manifestly shown to satisfy Ward-Takahaski-Slavnov-Taylor identities, and lead to the well-known one loop $\beta$ function for Non-Abelian gauge theory of QCD\cite{GWP}. The loop regularization method is realized in the dimension of original field theories, it maintains not only symmetries but also divergent behaviors of original field theories with the introduction of two energy scales. Such two scales play the roles of characterizing and sliding energy scales as well as ultraviolet and infrared cutoff energy scales. An explicit Check of those identities provides a clear demonstration how the symmetry-preserving Loop Regularization method can consistently be applied to non-Abelian gauge theories.
[ { "version": "v1", "created": "Tue, 15 Jan 2008 03:00:08 GMT" }, { "version": "v2", "created": "Thu, 24 Jan 2008 02:16:34 GMT" } ]
2008-11-26T00:00:00
[ [ "Cui", "Jian-Wei", "", "KITPC/Itp-Cas" ], [ "Wu", "Yue-Liang", "", "KITPC/Itp-Cas" ] ]
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801.22
Woonyoung So
W. Y. So, T. Udagawa, S. W. Hong, and B. T. Kim
Extended Optical Model Analyses of Elastic Scattering and Fusion Cross Section Data for the $^{12}$C+$^{208}$Pb System at Near-Coulomb-Barrier Energies by using a Folding Potential
26 pages, 7 figures, submitted to Physical Review C
Phys.Rev.C77:024609,2008
10.1103/PhysRevC.77.024609
null
nucl-th
null
Simultaneous $\chi^{2}$ analyses are performed for elastic scattering and fusion cross section data for the $^{12}$C+$^{208}$Pb system at near-Coulomb-barrier energies by using the extended optical model approach in which the polarization potential is decomposed into direct reaction (DR) and fusion parts. Use is made of the double folding potential as a bare potential. It is found that the experimental elastic scattering and fusion data are well reproduced without introducing any normalization factor for the double folding potential and also that both DR and fusion parts of the polarization potential determined from the $\chi^{2}$ analyses satisfy separately the dispersion relation. Furthermore, it is shown that the imaginary parts of both DR and fusion potentials at the strong absorption radius change very rapidly, which results in a typical threshold anomaly in the total imaginary potential as observed with tightly bound projectiles such as $\alpha$-particle and $^{16}$O.
[ { "version": "v1", "created": "Tue, 15 Jan 2008 03:05:44 GMT" } ]
2008-11-26T00:00:00
[ [ "So", "W. Y.", "" ], [ "Udagawa", "T.", "" ], [ "Hong", "S. W.", "" ], [ "Kim", "B. T.", "" ] ]
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801.2201
Ed Harcourt
Ed Harcourt
Policies of System Level Pipeline Modeling
null
null
null
null
cs.AR cs.PL
null
Pipelining is a well understood and often used implementation technique for increasing the performance of a hardware system. We develop several SystemC/C++ modeling techniques that allow us to quickly model, simulate, and evaluate pipelines. We employ a small domain specific language (DSL) based on resource usage patterns that automates the drudgery of boilerplate code needed to configure connectivity in simulation models. The DSL is embedded directly in the host modeling language SystemC/C++. Additionally we develop several techniques for parameterizing a pipeline's behavior based on policies of function, communication, and timing (performance modeling).
[ { "version": "v1", "created": "Tue, 15 Jan 2008 15:44:28 GMT" } ]
2008-01-16T00:00:00
[ [ "Harcourt", "Ed", "" ] ]
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801.2202
Nour-Eddine Raouafi
N.-E. Raouafi, S.K. Solanki and T. Wiegelmann
Hanle Effect Diagnostics of the Coronal Magnetic Field - A Test Using Realistic Magnetic Field Configurations
6 pages, 5 figures, Solar Polarization Workshop 5
null
null
null
astro-ph
null
Our understanding of coronal phenomena, such as coronal plasma thermodynamics, faces a major handicap caused by missing coronal magnetic field measurements. Several lines in the UV wavelength range present suitable sensitivity to determine the coronal magnetic field via the Hanle effect. The latter is a largely unexplored diagnostic of coronal magnetic fields with a very high potential. Here we study the magnitude of the Hanle-effect signal to be expected outside the solar limb due to the Hanle effect in polarized radiation from the H {\sc{i}} Ly$\alpha$ and $\beta$ lines, which are among the brightest lines in the off-limb coronal FUV spectrum. For this purpose we use a magnetic field structure obtained by extrapolating the magnetic field starting from photospheric magnetograms. The diagnostic potential of these lines for determining the coronal magnetic field, as well as their limitations are studied. We show that these lines, in particular H {\sc{i}} Ly$\beta$, are useful for such measurements.
[ { "version": "v1", "created": "Tue, 15 Jan 2008 03:16:22 GMT" } ]
2008-01-16T00:00:00
[ [ "Raouafi", "N. -E.", "" ], [ "Solanki", "S. K.", "" ], [ "Wiegelmann", "T.", "" ] ]
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801.2203
Akinobu Yamaguchi
A. Yamaguchi, K. Motoi, H. Miyajima, Y. Miyashita and Y. Sanada
Broadband ferromagnetic resonance of Ni81Fe19 wires using a rectifying effect
33pages, 8 figures. submitted
null
10.1103/PhysRevB.78.104401
null
cond-mat.mtrl-sci cond-mat.mes-hall
null
The broadband ferromagnetic resonance measurement using the rectifying effect of Ni81Fe19 wire has been investigated. One wire is deposited on the center strip line of the coplanar waveguide (CPW) and the other one deposited between two strip lines of CPW. The method is based on the detection of the magnetoresistance oscillation due to the magnetization dynamics induced by the radio frequency field. The magnetic field dependences of the resonance frequency and the rectification spectrum are presented and analytically interpreted on the standpoint of a uniform magnetization precession model.
[ { "version": "v1", "created": "Tue, 15 Jan 2008 03:43:54 GMT" } ]
2009-11-13T00:00:00
[ [ "Yamaguchi", "A.", "" ], [ "Motoi", "K.", "" ], [ "Miyajima", "H.", "" ], [ "Miyashita", "Y.", "" ], [ "Sanada", "Y.", "" ] ]
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801.2204
Ken-iti Izawa
K. Hamaguchi, K.-I. Izawa, H. Nakajima
Supersymmetric Inflation of Dynamical Origin
11 pages
Phys.Lett.B662:208-212,2008
10.1016/j.physletb.2008.03.001
UT-07-42
hep-ph
null
Dynamical models of inflation are given with composite inflatons by means of massive supersymmetric gauge theory. Nearly flat directions and stable massive ones in the potential are identified and slow-roll during inflation is examined. This kind of dynamical inflations may be ubiquitous in fundamental unified theory with supersymmetry, which should contain gauge theories for interactions of elementary particles.
[ { "version": "v1", "created": "Tue, 15 Jan 2008 03:58:15 GMT" } ]
2008-11-26T00:00:00
[ [ "Hamaguchi", "K.", "" ], [ "Izawa", "K. -I.", "" ], [ "Nakajima", "H.", "" ] ]
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801.2205
Junbo Li
Junbo Li, Yucai Su
Classification of Irreducible Weight Modules with a Finite-dimensional Weight Space over the Twisted Schr\"{o}dinger-Virasoro Lie algebra
6 pages
null
null
null
math.RA math.RT
null
It is shown that the support of an irreducible weight module over the Schr\"{o}dinger-Virasoro Lie algebra with an infinite-dimensional weight space, coincides with the weight lattice and that all nontrivial weight spaces of such a module are infinite-dimensional. As a side-product, it is obtained that every simple weight module over the Schr\"{o}dinger-Virasoro Lie algebra with a nontrivial finite-dimensional weight space, is a Harish-Chandra module.
[ { "version": "v1", "created": "Tue, 15 Jan 2008 04:00:14 GMT" } ]
2008-01-16T00:00:00
[ [ "Li", "Junbo", "" ], [ "Su", "Yucai", "" ] ]
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801.2206
Lev I. Shekhtman
V. M. Aulchenko, O. V. Evdokov, L. I. Shekhtman, K. A. Ten, B. P. Tolochko, I. L. Zhogin, V. V. Zhulanov
Detector for imaging of explosions: present status and future prospects with higher energy X-rays
14 pages, 15 figures. Submitted to JINST
JINST3:P05005,2008
10.1088/1748-0221/3/05/P05005
null
physics.ins-det
null
The detector for imaging of explosions (DIMEX) is in operation at the synchrotron radiation (SR) beam-line at VEPP-3 electron ring at Budker INP since 2002. DIMEX is based on one-coordinate gas ionization chamber filled with Xe-CO2(3:1) mixture at 7atm, and active Frisch-grid made of Gas Electron Multiplier (GEM). The detector has spatial resolution of ~0.2mm and dynamic range of ~100 that allows to realize the precision of signal measurement at a percent level. The frame rate can be tuned up to 8 MHz (125 ns per image) and up to 32 images can be stored in one shot. At present DIMEX is used with the X-ray beam from 2T wiggler that has ~20 keV average energy. Future possibility to install similar detector at the SR beam-line at VEPP-4 electron ring is discussed.
[ { "version": "v1", "created": "Tue, 15 Jan 2008 05:52:41 GMT" } ]
2008-11-26T00:00:00
[ [ "Aulchenko", "V. M.", "" ], [ "Evdokov", "O. V.", "" ], [ "Shekhtman", "L. I.", "" ], [ "Ten", "K. A.", "" ], [ "Tolochko", "B. P.", "" ], [ "Zhogin", "I. L.", "" ], [ "Zhulanov", "V. V.", "" ] ]
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801.2207
Junbo Li
Junbo Li, Yucai Su
The derivation algebra and automorphism group of the twisted Schr\"{o}dinger-Virasoro algebra
16 pages
null
null
null
math.RA
null
In this article, we determine the derivation algebra and the automorphism group of the twisted Schr\"{o}dinger-Virasoro algebra.
[ { "version": "v1", "created": "Tue, 15 Jan 2008 04:12:45 GMT" } ]
2008-01-16T00:00:00
[ [ "Li", "Junbo", "" ], [ "Su", "Yucai", "" ] ]
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801.2208
Luca Tessieri
J. C. Hern\'andez Herrej\'on, F. M. Izrailev, L. Tessieri
Anomalous properties of the Kronig-Penney model with compositional and structural disorder
11 pages, no figure
null
10.1016/j.physe.2008.05.001
null
cond-mat.dis-nn
null
We study the localization properties of the eigenstates in the Kronig-Penney model with weak compositional and structural disorder. The main result is an expression for the localization length that is valid for any kind of self- and inter-correlations of the two types of disorder. We show that the interplay between compositional and structural disorder can result in anomalous localization.
[ { "version": "v1", "created": "Tue, 15 Jan 2008 04:13:35 GMT" } ]
2009-11-13T00:00:00
[ [ "Herrejón", "J. C. Hernández", "" ], [ "Izrailev", "F. M.", "" ], [ "Tessieri", "L.", "" ] ]
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801.2209
Junbo Li
Junbo Li, Yucai Su
Representations of the Schr\"{o}dinger-Virasoro algebras
15 pages
null
10.1063/1.2924216
null
math.RA
null
In this paper it is proved that an irreducible weight module with finite-dimensional weight spaces over the Schr\"{o}dinger-Virasoro algebras is a highest/lowest weight module or a uniformly bounded module. Furthermore, indecomposable modules of the intermediate series over these algebras are completely determined.
[ { "version": "v1", "created": "Tue, 15 Jan 2008 04:18:21 GMT" } ]
2009-11-13T00:00:00
[ [ "Li", "Junbo", "" ], [ "Su", "Yucai", "" ] ]
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801.221
Junbo Li
Junbo Li, Yucai Su
2-Cocycles of Deformative Schr\"{o}dinger-Virasoro Algebras
18 pages
null
null
null
math.RA
null
In a series of papers by Henkel, Roger and Unterberger, Schr\"{o}dinger-Virasoro algebras and their deformations were introduced and investigated. In the present paper we determine the 2-cocycles of a class of deformative Schr\"{o}dinger-Virasoro algebras.
[ { "version": "v1", "created": "Tue, 15 Jan 2008 04:24:02 GMT" } ]
2008-01-16T00:00:00
[ [ "Li", "Junbo", "" ], [ "Su", "Yucai", "" ] ]
[ 0.0159039237, -0.0214769784, -0.0070298016, 0.047711771, 0.0071166717, 0.0827538595, -0.0237890612, 0.0496095493, -0.1311873198, -0.0165053327, 0.0393187739, -0.067945838, -0.0454397798, 0.0203944426, 0.0318078473, 0.045306135, 0.0360043421, 0.0963857919, 0.0610496812, 0.1117284, 0.0064183692, -0.1204956099, 0.038035769, 0.0192450844, 0.015142139, -0.0437023789, 0.0893292651, 0.0099700224, 0.1412375271, -0.1158981696, 0.0027280573, -0.0347213373, -0.0194321889, -0.0068493788, -0.0858009979, 0.0444775261, -0.0093819778, 0.0492353402, -0.0484601893, 0.1016781926, -0.008299442, -0.0892758071, -0.0159841105, 0.0868701711, 0.031166343, 0.0294022113, 0.0376882888, -0.0249785148, -0.0181358177, 0.0230272766, 0.0000040655, 0.0257803928, 0.0371269733, -0.0427668542, -0.1105523109, 0.0035282653, -0.0317543894, 0.012335564, 0.015168868, -0.1308665723, -0.0087939342, -0.0346411504, 0.0236955099, 0.0200469624, -0.1169673428, -0.0144872712, -0.1628347933, 0.0618515611, 0.0425262898, 0.0753231198, -0.1118353158, 0.0938732401, 0.0944612846, 0.0868701711, 0.0500639454, -0.0109924171, -0.0644710287, 0.082112357, 0.0329839364, 0.0778891295, 0.0115136383, 0.0271703154, 0.0360845327, 0.0978826359, -0.0366458483, 0.0001855388, 0.037608102, 0.1369608492, -0.0406285115, -0.0443706103, 0.0490482338, 0.0447982773, -0.0773545429, -0.0035048772, 0.1552436799, -0.0742539465, 0.0681596696, -0.0077915858, -0.0401206538, -0.0075643868, 0.037554644, -0.0907726437, 0.0483532734, 0.113225244, 0.029161647, 0.0909864753, 0.0302575473, 0.0093285199, -0.0918418169, -0.0434350856, -0.0459476374, -0.0652729049, -0.0287072491, 0.0033595366, 0.0352559239, -0.0439696684, -0.0348282568, -0.0102239503, -0.1092158481, 0.0290814601, -0.0463218465, -0.1119422391, 0.1266967952, -0.037554644, 0.0778356716, -0.0084063597, 0.0265956372, -0.0875651315, -0.0305783004, 0.0170933772, 0.0200202335, -0.0577352494, -0.0040227571, -0.0588044226, -0.0665024519, -0.0148213869, 0.0057768663, 0.0193787292, 0.0818985254, 0.0761784539, 0.1312942356, 0.0088206632, 0.0862286687, 0.0458139889, 0.0657540336, 0.0702445582, 0.0135450643, 0.062813811, -0.0198999513, -0.015797006, -0.1210301891, 0.0044671316, 0.0863355845, 0.1573820114, -0.0609427653, -0.013337912, -0.0446379036, 0.0298031494, 0.0072235889, 0.0678923801, -0.0106850304, 0.0932317376, -0.0068360139, -0.0894361809, -0.0028516804, -0.1002882719, -0.1157912537, 0.0590717159, 0.0049649645, -0.072489813, 0.0530576259, -0.0638829842, -0.1390991807, -0.0632949397, -0.0123221995, -0.0382763334, -0.066716291, -0.1478663981, -0.0423926413, 0.0189109668, 0.1214578599, 0.0907191858, 0.0012704763, 0.0389178358, -0.0131842187, -0.0189376976, 0.0989518017, 0.0399602763, -0.0674647093, 0.0170933772, -0.0601408854, 0.0347747952, 0.0956908315, 0.1333256662, 0.0415640362, -0.0807224363, -0.0229470897, 0.0420184322, -0.040895801, -0.1181434318, 0.024671128, -0.0253660902, 0.1247722954, -0.0663955361, -0.0001466978, -0.0550088622, 0.0774614587, -0.0012036531, 0.0660747886, 0.0199935026, 0.0271168575, -0.0188441444, -0.010705078, 0.0211428627, 0.0072169062, -0.0527101457, 0.0171735641, 0.0108855003, 0.0179086197, -0.0119546717, -0.031166343, 0.020434536, -0.0044905194, 0.042125348, 0.070030719, -0.0030471382, -0.0629207343, 0.0220516585, -0.0055830791, -0.0495560914, 0.0426866636, -0.0132176308, -0.0540466085, -0.0199534092, -0.0493155271, 0.0415907651, 0.0121685062, -0.0805620551, -0.0354163013, -0.0638829842, -0.1210301891, -0.0420184322, 0.0385970846, 0.0905053541, -0.0461614728, 0.0639899001, -0.0272104107, -0.0148748457, 0.1101246476, 0.0136118876, -0.1036561579, 0.005395974, 0.0705653057, 0.0474979356, -0.0526299588, 0.0232544765 ]
801.2211
Junbo Li
Junbo Li, Linsheng Zhu
Leibniz Central Extension on the Twisted Schr\"{o}dinger-Virasoro Algebra
9 pages
null
null
null
math.RA
null
In this paper we present all the Leibniz 2-cocycles of the twisted Schr\"{o}dinger-Virasoro algebra, which determine its second Leibniz cohomology group.
[ { "version": "v1", "created": "Tue, 15 Jan 2008 04:32:06 GMT" } ]
2008-01-16T00:00:00
[ [ "Li", "Junbo", "" ], [ "Zhu", "Linsheng", "" ] ]
[ -0.0271749552, -0.0813051239, 0.0149913952, 0.0225237161, 0.0244525764, 0.0606492274, -0.0250507686, -0.0047214348, -0.0622606799, -0.0556195416, 0.0157482903, -0.0553753823, -0.0952222198, 0.0908273458, 0.0136485174, 0.0300804544, -0.0110299066, 0.1186615303, -0.0162366088, 0.1435658038, -0.0177870225, -0.1266699582, 0.0185683332, 0.0548870638, 0.040335156, -0.0907785147, 0.0496376343, 0.0632373169, 0.1163176, -0.0930247828, 0.0052250139, -0.024318289, -0.0193374343, -0.0066350354, -0.1108484268, 0.0648976043, -0.026979629, -0.0003948518, -0.0194961391, 0.1161222756, 0.0305931885, -0.0248432327, -0.0176039021, 0.0960523635, 0.0547893979, 0.0046664989, 0.0812074617, -0.0083380481, -0.0567915067, -0.0027406907, 0.0408967212, -0.0230852831, 0.0296653826, -0.0748593137, -0.1569457501, -0.0273458678, -0.015357635, 0.0266866367, -0.0389434472, -0.1344830692, 0.0010018171, 0.0080755763, -0.0414827056, 0.0563031882, -0.0627489984, 0.0064702276, -0.042386096, -0.0194961391, 0.0298362952, 0.0191176906, -0.0762754381, 0.085504666, -0.0075079058, 0.1014726982, 0.0299827904, 0.009931189, 0.0003181704, 0.042752333, 0.0051761819, 0.0802308246, -0.0006382483, -0.0823794231, 0.0765684322, 0.0535197705, 0.0109993871, 0.0438510515, 0.0027361128, 0.0790100247, -0.0719782338, 0.0230242442, 0.0839420483, -0.0115304338, -0.0631396547, -0.0475622751, 0.0969801694, -0.053031452, 0.0895088837, -0.027492363, 0.0139170932, 0.034450911, 0.025343759, -0.0736873448, 0.0802796558, 0.0226335879, 0.0830630735, 0.1100671142, 0.0288840719, -0.0176283177, -0.1981598735, 0.0273458678, -0.0073492019, -0.0144420359, 0.032399971, -0.0347439013, 0.0579146408, -0.0811097994, -0.0359891169, -0.0186171643, -0.0477820188, 0.0380644724, 0.0012383467, -0.0671927035, 0.0572798252, 0.026466893, 0.0601609088, -0.0296653826, 0.0113351066, -0.0332789458, 0.0751034692, 0.0887764096, 0.0183119643, -0.0127085038, 0.0283225048, 0.0424105115, -0.0051517664, 0.0056980732, 0.0064946436, 0.018018974, 0.1307718456, 0.0367704257, 0.0728572011, 0.040188659, 0.0682181716, -0.0328394584, 0.0976638123, 0.1186615303, -0.0511270054, 0.0119027775, 0.0314721651, -0.0675833598, -0.1031329855, 0.049857378, 0.0459019914, 0.0320825614, -0.1730602831, 0.0244159531, -0.0629931614, 0.0807191432, -0.0696831271, 0.056059029, 0.0112252347, 0.1231540665, 0.0120248571, -0.0008751593, 0.0393096842, -0.0331324488, -0.073785007, -0.0053135217, -0.0211075917, -0.1469840407, 0.0090155909, -0.0871649534, -0.1072348654, -0.0130259106, 0.0797425061, 0.0467565507, -0.0185927488, -0.1871238649, -0.0768614188, 0.0517618209, 0.054154586, 0.0324243866, 0.0285910815, -0.0395050123, -0.0272482038, -0.0142100845, 0.1167082563, 0.1180755496, -0.0567915067, 0.0407746434, -0.0652394295, 0.0398468375, 0.141710192, 0.1245213598, 0.0873602778, -0.0242572501, -0.0124704484, 0.0550335571, -0.0162610244, -0.0289817359, 0.0256367512, 0.0203751121, 0.083551392, -0.0739803389, 0.0060704164, 0.0553753823, 0.1105554327, -0.0000092812, -0.0604538992, -0.035427548, 0.0394073501, -0.0501503684, -0.0012337686, -0.005759113, -0.0159436166, 0.0125986319, -0.0001829289, 0.0124155125, -0.0353787169, 0.0699761212, -0.0147472359, -0.0150402272, 0.0205460247, 0.0377958938, 0.0804261491, -0.0016206088, -0.0339625925, 0.0258076619, 0.0654347539, -0.0022020137, 0.0862859786, 0.0655324161, -0.1176848933, -0.140733555, -0.0268087164, 0.058305297, 0.0034945332, 0.0066716592, -0.0182631332, -0.0982986242, 0.003726485, -0.0177626051, 0.0320337303, 0.1170012504, -0.0354763791, -0.0157360826, -0.0342311673, -0.0350613073, 0.1200288236, 0.0402130745, -0.0961988568, 0.0767149255, 0.095026888, -0.0108162677, -0.0459019914, 0.040188659 ]
801.2212
Jia Wei
J. Wei, Y. Zhang, H. W. Ou, B. P. Xie, D. W. Shen, J. F. Zhao, L. X. Yang, M. Arita, K. Shimada, H. Namatame, M. Taniguchi, Y. Yoshida, H. Eisaki, and D. L. Feng
Superconducting coherence peak in the electronic excitations of a single layer cuprate superconductor $Bi_2 Sr_{1.6} La_{0.4} Cu O_{6+\delta}$
5 pages, 4 figures
null
10.1103/PhysRevLett.101.097005
null
cond-mat.supr-con cond-mat.str-el
null
Angle resolved photoemission spectroscopy study is reported on a high quality optimally doped Bi2Sr1.6La0.4CuO6+delta high Tc superconductor. In the antinodal region with maximal d-wave gap, the symbolic superconducting coherence peak, which has been widely observed in multi-CuO2-layer cuprate superconductors, is unambiguously observed in a single layer system. The associated peak-dip separation is just about 19 meV, which is much smaller than its counterparts in multi-layered compounds, but correlates with the energy scales of spin excitations in single layer cuprates.
[ { "version": "v1", "created": "Tue, 15 Jan 2008 09:10:36 GMT" } ]
2009-11-13T00:00:00
[ [ "Wei", "J.", "" ], [ "Zhang", "Y.", "" ], [ "Ou", "H. W.", "" ], [ "Xie", "B. P.", "" ], [ "Shen", "D. W.", "" ], [ "Zhao", "J. F.", "" ], [ "Yang", "L. X.", "" ], [ "Arita", "M.", "" ], [ "Shimada", "K.", "" ], [ "Namatame", "H.", "" ], [ "Taniguchi", "M.", "" ], [ "Yoshida", "Y.", "" ], [ "Eisaki", "H.", "" ], [ "Feng", "D. L.", "" ] ]
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801.2213
Matveev Alexei S.
V.E. Didenko, A.S. Matveev and M.A. Vasiliev
Unfolded Description of $AdS_4$ Kerr Black Hole
18 pages
Phys.Lett.B665:284-293,2008
10.1016/j.physletb.2008.05.067
null
gr-qc hep-th
null
It is shown that $AdS_4$ Kerr black hole is a solution of simple unfolded differential equations that form a deformation of the zero-curvature description of empty $AdS_4$ space-time. Our construction uses the Killing symmetries of the Kerr solution. All known and some new algebraic properties of the Kerr-Schild solution result from the obtained black hole unfolded system in the coordinate-independent way. Kerr Schild type solutions of free equations in $AdS_4$ for massless fields of any spin, associated to the proposed black hole unfolded system, are found.
[ { "version": "v1", "created": "Tue, 15 Jan 2008 05:01:34 GMT" }, { "version": "v2", "created": "Wed, 16 Jan 2008 00:20:39 GMT" } ]
2008-11-26T00:00:00
[ [ "Didenko", "V. E.", "" ], [ "Matveev", "A. S.", "" ], [ "Vasiliev", "M. A.", "" ] ]
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801.2214
Debashish Chowdhury
Debashish Chowdhury, Aakash Basu, Ashok Garai, Philip Greulich, Katsuhiro Nishinari, Andreas Schadschneider and Tripti Tripathi
Intra-cellular traffic: bio-molecular motors on filamentary tracks
9 pages, 11 figures; Based on the invited talk delivered by the first author (DC) at the IUPAP International Conference STATPHYS23, Genoa (Italy), July, 2007
European Physical Journal B, vol. 64, p. 593 (2008).
10.1140/epjb/e2008-00073-5
null
physics.bio-ph cond-mat.stat-mech q-bio.SC
null
Molecular motors are macromolecular complexes which use some form of input energy to perform mechanical work. The filamentary tracks, on which these motors move, are made of either proteins (e.g., microtubules) or nucleic acids (DNA or RNA). Often, many such motors move simultaneously on the same track and their collective properties have superficial similarities with vehicular traffic on highways. The models we have developed provide ``unified'' description: in the low-density limit, a model captures the transport properties of a single motor while, at higher densities the same model accounts for the collective spatio-temporal organization of interacting motors. By drawing analogy with vehicular traffic, we have introduced novel quantities for characterizing the nature of the spatio-temporal organization of molecular motors on their tracks. We show how the traffic-like intracellular collective phenomena depend on the mechano-chemistry of the corresponding individual motors.
[ { "version": "v1", "created": "Tue, 15 Jan 2008 04:57:26 GMT" } ]
2008-08-17T00:00:00
[ [ "Chowdhury", "Debashish", "" ], [ "Basu", "Aakash", "" ], [ "Garai", "Ashok", "" ], [ "Greulich", "Philip", "" ], [ "Nishinari", "Katsuhiro", "" ], [ "Schadschneider", "Andreas", "" ], [ "Tripathi", "Tripti", "" ] ]
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801.2215
Ulrich Mohrhoff
U. Mohrhoff
The Utility of Time-Symmetric Quantum Counterfactuals: A Response to Kastner
17 pages
null
null
null
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Kastner's (Philosophy of Science 70, 2003, pp. 145--163) recent objections to the counterfactual usage of the time-symmetric Aharonov-Bergmann-Lebowitz rule by the author, especially her claims that the resulting time-symmetric quantum counterfactuals are vacuous or invalid, are examined and shown to be unfounded or beside the point.
[ { "version": "v1", "created": "Tue, 15 Jan 2008 05:10:00 GMT" }, { "version": "v2", "created": "Mon, 15 Dec 2008 01:11:24 GMT" } ]
2008-12-15T00:00:00
[ [ "Mohrhoff", "U.", "" ] ]
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801.2216
Fuquan Fang
Fuquan Fang, S. Mendonca
Knots in Riemannian manifolds
9 pages
null
null
null
math.DG math.AG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper we study submanifold with nonpositive extrinsic curvature in a positively curved manifold. Among other things we prove that, if $K\subset (S^n, g)$ is a totally geodesic submanifold in a Riemannian sphere with positive sectional curvature where $n\ge 5$, then $K$ is homeomorphic to $S^{n-2}$ and the fundamental group of the knot complement $\pi_1(S^n-K)\cong \Bbb Z$.
[ { "version": "v1", "created": "Tue, 15 Jan 2008 05:45:47 GMT" }, { "version": "v2", "created": "Mon, 25 Aug 2008 06:52:10 GMT" } ]
2008-08-25T00:00:00
[ [ "Fang", "Fuquan", "" ], [ "Mendonca", "S.", "" ] ]
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801.2217
Paul Michalski
P. J. Michalski and E. J. Mele
Carbon Nanotubes in Helically Modulated Potentials
12 pages, 10 figures. Accepted for publication in Physical Review B. Image quality reduced to comply with arxiv size limitations
null
10.1103/PhysRevB.77.085429
null
cond-mat.mes-hall
null
We calculate effects of an applied helically symmetric potential on the low energy electronic spectrum of a carbon nanotube in the continuum approximation. The spectrum depends on the strength of this potential and on a dimensionless geometrical parameter, P, which is the ratio of the circumference of the nanotube to the pitch of the helix. We find that the minimum band gap of a semiconducting nanotube is reduced by an arbitrarily weak helical potential, and for a given field strength there is an optimal P which produces the biggest change in the band gap. For metallic nanotubes the Fermi velocity is reduced by this potential and for strong fields two small gaps appear at the Fermi surface in addition to the gapless Dirac point. A simple model is developed to estimate the magnitude of the field strength and its effect on DNA-CNT complexes in an aqueous solution. We find that under typical experimental conditions the predicted effects of a helical potential are likely to be small and we discuss several methods for increasing the size of these effects.
[ { "version": "v1", "created": "Tue, 15 Jan 2008 05:47:49 GMT" } ]
2009-11-13T00:00:00
[ [ "Michalski", "P. J.", "" ], [ "Mele", "E. J.", "" ] ]
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801.2218
Renato Renner
Roger Colbeck and Renato Renner
Hidden variable models for quantum theory cannot have any local part
latex, 5 pages
Phys.Rev.Lett.101:050403,2008
10.1103/PhysRevLett.101.050403
null
quant-ph
null
It was shown by Bell that no local hidden variable model is compatible with quantum mechanics. If, instead, one permits the hidden variables to be entirely non-local, then any quantum mechanical predictions can be recovered. In this paper, we consider general hidden variable models which can have both local and non-local parts. We then show the existence of (experimentally verifiable) quantum correlations that are incompatible with any hidden variable model having a non-trivial local part, such as the model proposed by Leggett.
[ { "version": "v1", "created": "Tue, 15 Jan 2008 16:56:27 GMT" }, { "version": "v2", "created": "Wed, 16 Jan 2008 12:06:46 GMT" } ]
2008-11-26T00:00:00
[ [ "Colbeck", "Roger", "" ], [ "Renner", "Renato", "" ] ]
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801.2219
Atsushi Goto
Atsushi Goto, Kenjiro Hashi, Tadashi Shimizu, Shinobu Ohki
Dynamics of the electron-nuclear and heteronuclear polarization transfers in optically-oriented semi-insulating InP:Fe
7 pages, 4 figures, submitted to Physical Review B
Physical Review B 77, 115203 (2008).
10.1103/PhysRevB.77.115203
null
cond-mat.mtrl-sci
null
Dynamics of the electron-nuclear and heteronuclear polarization-transfer processes in the optically oriented semi-insulating iron-doped indium phosphide were investigated through the characteristic time scales of the processes. (1) We find in the optical nuclear orientation process that the buildup times for 31P and 115In nuclear polarizations are of the same order. From the analysis of the cross-relaxation process between photo-excited electrons and nuclei, it is concluded that electron-nuclear dipolar-couplings are responsible for the polarization transfer in this case. This example shows that the nuclear-site dependence of the buildup time can be utilized to identify hyperfine couplings responsible for the process. (2) We find in the heteronuclear polarization transfer (cross polarization) process between optically oriented 31P and 115In that the cross-relaxation time is rather short; it is an order of magnitude shorter than that expected for nuclear dipolar couplings when a magnetic field is applied parallel to the crystalline [100] axis. From the cross polarization spectral density analysis, it is concluded that a large J-coupling of the order of 2 kHz exists between these nuclei and that its angular dependence is not of a simple pseudo-dipolar type.
[ { "version": "v1", "created": "Tue, 15 Jan 2008 06:22:27 GMT" } ]
2008-03-11T00:00:00
[ [ "Goto", "Atsushi", "" ], [ "Hashi", "Kenjiro", "" ], [ "Shimizu", "Tadashi", "" ], [ "Ohki", "Shinobu", "" ] ]
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801.222
Christian Kurtsiefer
Alexander Ling, Antia Lamas-Linares, Christian Kurtsiefer
Absolute emission rates of Spontaneous Parametric Down Conversion into single transverse Gaussian modes
RevTeX, 7 pages, 4 figures; this version has a short section discussing ratios between pump and target waists
Phys. Rev. A 77, 043834 (2008)
10.1103/PhysRevA.77.043834
null
quant-ph
null
We provide an estimate on the absolute values of the emission rate of photon pairs produced by spontaneous parametric down conversion in a bulk crystal when all interacting fields are in single transverse Gaussian modes. Both collinear and non-collinear configurations are covered, and we arrive at a fully analytical expression for the collinear case. Our results agree reasonably well with values found in typical experiments, which allows this model to be used for understanding the dependency on the relevant experimental parameters.
[ { "version": "v1", "created": "Tue, 15 Jan 2008 06:29:51 GMT" }, { "version": "v2", "created": "Tue, 29 Apr 2008 01:40:48 GMT" } ]
2008-04-29T00:00:00
[ [ "Ling", "Alexander", "" ], [ "Lamas-Linares", "Antia", "" ], [ "Kurtsiefer", "Christian", "" ] ]
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801.2221
Harish Seshadri
Siddartha Gadgil, Harish Seshadri
On the topology of manifolds with positive isotropic curvature
5 Pages. To appear in Proc. of AMS
null
null
null
math.DG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We show that a closed orientable Riemannian $n$-manifold, $n \ge 5$, with positive isotropic curvature and free fundamental group is homeomorphic to the connected sum of copies of $S^{n-1} \times S^1$.
[ { "version": "v1", "created": "Tue, 15 Jan 2008 06:40:58 GMT" }, { "version": "v2", "created": "Tue, 10 Jun 2008 08:23:07 GMT" }, { "version": "v3", "created": "Wed, 15 Oct 2008 06:11:07 GMT" } ]
2008-10-15T00:00:00
[ [ "Gadgil", "Siddartha", "" ], [ "Seshadri", "Harish", "" ] ]
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801.2222
Van An Dinh
Van An Dinh, Kazunori Sato and Hirosi Katayama-Yoshida
Structural and magnetic properties of half-heusler alloys NiCrZ (Z = Si, P, Ge, As, Te): First principle study
10 pages, 3 figures
null
10.1016/j.commatsci.2011.08.037
null
cond-mat.mtrl-sci cond-mat.str-el
null
We present a first principle study of new class of high-$T_c$ half-heusler ferromagnets NiCrZ (Z = Si, P, Ge, As, Te). The structure and magnetic properties are investigated through the calculation of the electronic structure, equilibrium lattice constant, magnetic exchange interaction $J_{ij}$ and Curie temperature $T_c$. The role of $sp$-elements and the influence of lattice expansion/compression are also studied. In alloys having 20 valence electrons, a pseudo-gap of the majority band can be formed at Fermi level. Otherwise, the half-metallicity and ferromagnetism at temperatures much higher than room temperature are found to be stable in a wide range of lattice expansion. Based on these results, NiCrZ can be expected to be promising materials for spintronics.
[ { "version": "v1", "created": "Tue, 15 Jan 2008 06:52:28 GMT" } ]
2011-10-26T00:00:00
[ [ "Dinh", "Van An", "" ], [ "Sato", "Kazunori", "" ], [ "Katayama-Yoshida", "Hirosi", "" ] ]
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801.2223
Shuang Zhang
Shuang Zhang, Dentcho A. Genov, Cheng Sun and Xiang Zhang
Cloaking of Matter Waves
14 pages, 3 figs
null
10.1103/PhysRevLett.100.123002
null
physics.optics physics.gen-ph
null
Invariant transformation for quantum mechanical systems is proposed. A cloaking of matter wave can be realized at given energy by designing the potential and effective mass of the matter waves in the cloaking region. The general conditions required for such a cloaking are determined and confirmed by both the wave and particle (classical) approaches. We show that it may be possible to construct such a cloaking system for cold atoms using optical lattices.
[ { "version": "v1", "created": "Tue, 15 Jan 2008 07:13:15 GMT" } ]
2009-11-13T00:00:00
[ [ "Zhang", "Shuang", "" ], [ "Genov", "Dentcho A.", "" ], [ "Sun", "Cheng", "" ], [ "Zhang", "Xiang", "" ] ]
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801.2224
Dan J. Spitzner
Dan J. Spitzner
A powerful test based on tapering for use in functional data analysis
Published in at http://dx.doi.org/10.1214/08-EJS172 the Electronic Journal of Statistics (http://www.i-journals.org/ejs/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Electronic Journal of Statistics 2008, Vol. 2, 939-962
10.1214/08-EJS172
IMS-EJS-EJS_2008_172
math.ST stat.TH
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A test based on tapering is proposed for use in testing a global linear hypothesis under a functional linear model. The test statistic is constructed as a weighted sum of squared linear combinations of Fourier coefficients, a tapered quadratic form, in which higher Fourier frequencies are down-weighted so as to emphasize the smooth attributes of the model. A formula is $Q_n^{OPT}=n\sum_{j=1}^{p_n}j^{-1/2}\|\boldsymbol{Y}_{n,j}\|^2$. Down-weighting by $j^{-1/2}$ is selected to achieve adaptive optimality among tests based on tapering with respect to its ``rates of testing,'' an asymptotic framework for measuring a test's retention of power in high dimensions under smoothness constraints. Existing tests based on truncation or thresholding are known to have superior asymptotic power in comparison with any test based on tapering; however, it is shown here that high-order effects can be substantial, and that a test based on $Q_n^{OPT}$ exhibits better (non-asymptotic) power against the sort of alternatives that would typically be of concern in functional data analysis applications. The proposed test is developed for use in practice, and demonstrated in an example application.
[ { "version": "v1", "created": "Tue, 15 Jan 2008 07:36:08 GMT" }, { "version": "v2", "created": "Thu, 9 Oct 2008 12:49:59 GMT" } ]
2008-10-09T00:00:00
[ [ "Spitzner", "Dan J.", "" ] ]
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801.2225
Van An Dinh
Van An Dinh, Kazunori Sato and Hiroshi Katayama-Yoshida
New High-$T_c$ Half-Heusler Ferromagnets NiMnZ (Z = Si, P, Ge, As)
6 pages, 6 figures
J. Phys. Soc. Jpn. 77 (2008) 014705
10.1143/JPSJ.77.014705
null
cond-mat.mtrl-sci cond-mat.str-el
null
Based on the first principle calculation, we propose a new class of high-$T_c$ half-heusler ferromagnets NiMnZ (Z = Si, P, Ge, As). The structural and magnetic properties are investigated through the calculation of the electronic structure, phase stability, equilibrium lattice constant, magnetic exchange interaction $J_{ij}$ and Curie temperature $T_c$. It is found that all alloys show half-metallicity and ferromagnetism at temperatures much higher than room temperature in a wide range of lattice expansion (compression). At the equilibrium lattice constant, $T_c$ of 715K, 840K, 875K and 1050K are predicted by Monte Carlo simulation for NiMnP, NiMnAs, NiMnGe and NiMnSi, respectively. Following these results, these alloys are strongly expected to be promising candidates for spintronic applications.
[ { "version": "v1", "created": "Tue, 15 Jan 2008 07:40:03 GMT" } ]
2008-01-16T00:00:00
[ [ "Dinh", "Van An", "" ], [ "Sato", "Kazunori", "" ], [ "Katayama-Yoshida", "Hiroshi", "" ] ]
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801.2226
Kees Middelburg
J. A. Bergstra, C. A. Middelburg
Programming an interpreter using molecular dynamics
27 pages
Scientific Annals of Computer Science, 17:47--81, 2007. http://www.infoiasi.ro/bin/download/Annals/XVII/XVII_2.pdf
null
PRG0801
cs.PL
null
PGA (ProGram Algebra) is an algebra of programs which concerns programs in their simplest form: sequences of instructions. Molecular dynamics is a simple model of computation developed in the setting of PGA, which bears on the use of dynamic data structures in programming. We consider the programming of an interpreter for a program notation that is close to existing assembly languages using PGA with the primitives of molecular dynamics as basic instructions. It happens that, although primarily meant for explaining programming language features relating to the use of dynamic data structures, the collection of primitives of molecular dynamics in itself is suited to our programming wants.
[ { "version": "v1", "created": "Tue, 15 Jan 2008 07:56:12 GMT" } ]
2008-04-08T00:00:00
[ [ "Bergstra", "J. A.", "" ], [ "Middelburg", "C. A.", "" ] ]
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801.2227
Remi Carles
Valeria Banica (DP), R\'emi Carles (I3M), Thomas Duyckaerts (AGM)
On scattering for NLS: from Euclidean to hyperbolic space
13 pages. References updated; see Remark 1.1
Discrete and Continuous Dynamical Systems: Series A 24, 4 (2009) 1113-1127
10.3934/dcds.2009.24.1113
null
math.AP math-ph math.MP
null
We prove asymptotic completeness in the energy space for the nonlinear Schrodinger equation posed on hyperbolic space in the radial case, in space dimension at least 4, and for any energy-subcritical, defocusing, power nonlinearity. The proof is based on simple Morawetz estimates and weighted Strichartz estimates. We investigate the same question on spaces which kind of interpolate between Euclidean space and hyperbolic space, showing that the family of short range nonlinearities becomes larger and larger as the space approaches the hyperbolic space. Finally, we describe the large time behavior of radial solutions to the free dynamics.
[ { "version": "v1", "created": "Tue, 15 Jan 2008 08:03:05 GMT" }, { "version": "v2", "created": "Tue, 22 Jan 2008 15:17:18 GMT" } ]
2009-06-18T00:00:00
[ [ "Banica", "Valeria", "", "DP" ], [ "Carles", "Rémi", "", "I3M" ], [ "Duyckaerts", "Thomas", "", "AGM" ] ]
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801.2228
Hans Brom
L. J. Huijbregts, H. B. Brom, J. C. M. Brokken-Zijp, W.E. Kleinjan, and M. A. J. Michels
Dielectric quantification of conductivity limitations due to nanofiller size in conductive powders and nanocomposites
6 pages, 4 figures
null
10.1103/PhysRevB.77.075322
null
cond-mat.mtrl-sci cond-mat.dis-nn
null
Conducting submicron particles are well-suited as filler particles in non-conducting polymer matrices to obtain a conducting composite with a low percolation threshold. Going to nanometer-sized filler particles imposes a restriction to the conductivity of the composite, due to the reduction of the density of states involved in the hopping process between the particles, compared to its value within the crystallites. We show how those microscopic parameters that govern the charge-transport processes across many decades of length scales, can accurately and consistently be determined by a range of dielectric-spectroscopy techniques from a few Hz to infrared frequencies. The method, which is suited for a variety of systems with restricted geometries, is applied to densely packed 7-nm-sized tin-oxide crystalline particles with various degree of antimony doping and the quantitative results unambiguously show the role of the nanocrystal charging energy in limiting the hopping process.
[ { "version": "v1", "created": "Tue, 15 Jan 2008 08:27:20 GMT" } ]
2009-11-13T00:00:00
[ [ "Huijbregts", "L. J.", "" ], [ "Brom", "H. B.", "" ], [ "Brokken-Zijp", "J. C. M.", "" ], [ "Kleinjan", "W. E.", "" ], [ "Michels", "M. A. J.", "" ] ]
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801.2229
Rikkert Frederix
Rikkert Frederix and Massimiliano Grazzini
Higher-order QCD effects in the Higgs to ZZ search channel at the LHC
12 pages, 8 figures. Discussion on scale uncertainties added
Phys.Lett.B662:353-359,2008
10.1016/j.physletb.2008.03.030
CP3-08-01
hep-ph
null
We present a consistent analysis of the signal as well as the irreducible background for the search of the SM Higgs boson in the ZZ decay channel at the LHC. Soft-gluons effects are resummed up to next-to-leading logarithmic accuracy, and the results are compared to those obtained with fixed order calculations and the MC@NLO event generator. The soft-gluon effects are typically modest but should be taken into account when precise predictions are demanded. Our results show that the signal over background ratio can be significantly enhanced with a cut on the transverse momentum pt(ZZ) of the ZZ pair. We also introduce a fully transverse angular variable that could give information about the CP nature of the Higgs boson.
[ { "version": "v1", "created": "Tue, 15 Jan 2008 09:00:17 GMT" }, { "version": "v2", "created": "Tue, 27 May 2008 08:09:04 GMT" } ]
2008-11-26T00:00:00
[ [ "Frederix", "Rikkert", "" ], [ "Grazzini", "Massimiliano", "" ] ]
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801.223
Ingrid Beltita
Ingrid Beltita, Anders Melin
Analysis of the quadratic term in the backscattering transformation
14 pages
null
null
null
math.AP math-ph math.MP
null
The quadratic term in the Taylor expansion at the origin of the backscattering transformation in odd dimensions $n\ge 3$ gives rise to a symmetric bilinear operator $B_2$ on $C_0^\infty({\mathbb R}^n)\times C_0^\infty({\mathbb R}^n)$. In this paper we prove that $B_2$ extends to certain Sobolev spaces with weights and show that it improves both regularity and decay.
[ { "version": "v1", "created": "Tue, 15 Jan 2008 09:05:01 GMT" } ]
2008-01-16T00:00:00
[ [ "Beltita", "Ingrid", "" ], [ "Melin", "Anders", "" ] ]
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801.2231
Jian-feng Yao
C\'ecile Hardouin, Jian-Feng Yao
Spatial modelling for mixed-state observations
Published in at http://dx.doi.org/10.1214/08-EJS173 the Electronic Journal of Statistics (http://www.i-journals.org/ejs/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Electronic Journal of Statistics 2008, Vol. 2, 213-233
10.1214/08-EJS173
IMS-EJS-EJS_2008_173
math.ST stat.TH
null
In several application fields like daily pluviometry data modelling, or motion analysis from image sequences, observations contain two components of different nature. A first part is made with discrete values accounting for some symbolic information and a second part records a continuous (real-valued) measurement. We call such type of observations "mixed-state observations". This paper introduces spatial models suited for the analysis of these kinds of data. We consider multi-parameter auto-models whose local conditional distributions belong to a mixed state exponential family. Specific examples with exponential distributions are detailed, and we present some experimental results for modelling motion measurements from video sequences.
[ { "version": "v1", "created": "Tue, 15 Jan 2008 15:04:51 GMT" }, { "version": "v2", "created": "Thu, 27 Mar 2008 08:13:32 GMT" } ]
2008-03-27T00:00:00
[ [ "Hardouin", "Cécile", "" ], [ "Yao", "Jian-Feng", "" ] ]
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801.2232
Valery Lyubovitskij
Amand Faessler, Thomas Gutsche, Valery E. Lyubovitskij, Yong-Liang Ma
Molecular structure of the Bs0*(5725) and Bs1(5778) bottom-strange mesons
21 pages, 7 figures
Phys.Rev.D77:114013,2008
10.1103/PhysRevD.77.114013
null
hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We discuss a possible interpretation of the scalar Bs0*(5725) and axial Bs1(5778) bottom-strange mesons as hadronic molecules - bound states of B K and B* K mesons, respectively. Using a phenomenological Lagrangian approach we analyze the strong Bs0* to Bs pi0, Bs1 to Bs* pi0 and the radiative Bs0* to Bs* gamma, Bs1 to Bs gamma, Bs1 to Bs* gamma, Bs1 to Bs0* gamma decays. We give predictions for the decay properties: effective couplings and decay widths.
[ { "version": "v1", "created": "Tue, 15 Jan 2008 09:08:27 GMT" }, { "version": "v2", "created": "Wed, 11 Jun 2008 14:25:58 GMT" } ]
2008-11-26T00:00:00
[ [ "Faessler", "Amand", "" ], [ "Gutsche", "Thomas", "" ], [ "Lyubovitskij", "Valery E.", "" ], [ "Ma", "Yong-Liang", "" ] ]
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801.2233
Lucile Sassatelli
Lucile Sassatelli and David Declercq
Analysis of Non-binary Hybrid LDPC Codes
in the proceedings of IEEE International Symposium on Information Theory, June 2007, Nice, France
null
null
null
cs.IT math.IT
null
In this paper, we analyse asymptotically a new class of LDPC codes called Non-binary Hybrid LDPC codes, which has been recently introduced. We use density evolution techniques to derive a stability condition for hybrid LDPC codes, and prove their threshold behavior. We study this stability condition to conclude on asymptotic advantages of hybrid LDPC codes compared to their non-hybrid counterparts.
[ { "version": "v1", "created": "Tue, 15 Jan 2008 09:32:57 GMT" } ]
2009-09-29T00:00:00
[ [ "Sassatelli", "Lucile", "" ], [ "Declercq", "David", "" ] ]
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801.2234
M. K. Vemuri
M. K. Vemuri
Hermite expansions and Hardy's theorem
11 pages
null
null
null
math.AP math-ph math.MP math.RT
null
Assuming that both a function and its Fourier transform are dominated by a Gaussian of large variance, it is shown that the Hermite coefficients of the function decay exponentially. A sharp estimate for the rate of exponential decay is obtained in terms of the variance, and in the limiting case (when the variance becomes so small that the Gaussian is its own Fourier transform), Hardy's theorem on Fourier transform pairs is obtained. A quantitative result on the confinement of particle-like states of a quantum harmonic oscillator is obtained. A stronger form of the result is conjectured. Further, it is shown how Hardy's theorem may be derived from a weak version of confinement without using complex analysis.
[ { "version": "v1", "created": "Tue, 15 Jan 2008 13:42:49 GMT" } ]
2008-01-16T00:00:00
[ [ "Vemuri", "M. K.", "" ] ]
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801.2235
Miryam Garcia-Fernandez
M. Garcia-Fernandez, U. Staub, Y. Bodenthin, S. M. Lawrence, A. M. Mulders, C. E. Buckley, S. Weyeneth, E. Pomjakushina, and K. Conder
A Resonant soft x-ray powder diffraction study to determine the orbital ordering in A-site ordered SmBaMn2O6
null
null
10.1103/PhysRevB.77.060402
null
cond-mat.str-el
null
Soft X-ray resonant powder diffraction has been performed at the Mn L2,3 edges of A-site ordered SmBaMn2O6. The energy and polarization dependence of the (1/2 1/2 0) reflection provide direct evidence for a (x2-z2)/(y2-z2) type orbital ordering in contrast to the single layer manganite. The temperature dependence of the reflection indicates an orbital reorientation transition at 210 K, below which the charge and orbital ordered MnO2 sheets show AAAA type of stacking. The concurring reduction of the ferromagnetic super exchange correlations leads to further charge localization.
[ { "version": "v1", "created": "Tue, 15 Jan 2008 09:23:55 GMT" } ]
2009-11-13T00:00:00
[ [ "Garcia-Fernandez", "M.", "" ], [ "Staub", "U.", "" ], [ "Bodenthin", "Y.", "" ], [ "Lawrence", "S. M.", "" ], [ "Mulders", "A. M.", "" ], [ "Buckley", "C. E.", "" ], [ "Weyeneth", "S.", "" ], [ "Pomjakushina", "E.", "" ], [ "Conder", "K.", "" ] ]
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801.2236
Vladimir Grinin
L.V. Tambovtseva and V.P. Grinin
Dust in the disk winds from young stars as a source of the circumstellar extinction
12 pages, 5 figures. accepted by Astronomy Letters
null
10.1007/s11443-008-4002-1
null
astro-ph
null
We examine a problem of the dust grains survival in the disk wind in T Tauri stars (TTSs). For consideration we choose the disk wind model described by Garcia et al. (2001), where a gas component of the wind is heated by an ambipolar diffusion up to the temperature of the order of 10$^4$ K. It is shown that the dust grains heating due to collisions with the gas atoms and electrons is inefficient in comparison with heating by the stellar radiation, and thus, dust survives even in the hot wind component. Owing to this, the disk wind may be opaque for the ultraviolet and optical radiation of the star and is capable to absorb its noticeable fraction. Calculations show that at the accretion rate $\dot{M_a} = 10^{-8}-10^{-6} M_\odot$ per year this fraction for TTSs may range from 20% to 40% of a total luminosity of the star correspondingly. This means that the disk wind in TTSs can play the same role as the puffed inner rim considered in the modern models of accretion disks. In Herbig Ae stars (HAEs) inner regions of the disk winds ($r \le 0.5$ AU) are free of dust since there dust grains sublimate under the effect of the radiation of the star. Therefore, in this case a fraction of the absorbed radiation by the disk wind is significantly less, and may be compared with the effect of the "puffed-up inner rim" only at $\dot{M_a} \geq 10^{-6} M_\odot$ yr$^{-1}$. Due to the structural inhomogeneity of the disk wind its optical depth towards an observer may be variable resulting in the photometric activity of the young stars. For the same reason, one can observe moving shadows from the gas and dust streams with the spiral-like structure on the highly resolved circumstellar disk images.
[ { "version": "v1", "created": "Tue, 15 Jan 2008 09:26:21 GMT" } ]
2009-11-13T00:00:00
[ [ "Tambovtseva", "L. V.", "" ], [ "Grinin", "V. P.", "" ] ]
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801.2237
Kirill Melnikov
Walter T. Giele, Zoltan Kunszt, Kirill Melnikov
Full one-loop amplitudes from tree amplitudes
27 pages, revtex
JHEP 0804:049,2008
10.1088/1126-6708/2008/04/049
null
hep-ph
null
We establish an efficient polynomial-complexity algorithm for one-loop calculations, based on generalized $D$-dimensional unitarity. It allows automated computations of both cut-constructible {\it and} rational parts of one-loop scattering amplitudes from on-shell tree amplitudes. We illustrate the method by (re)-computing all four-, five- and six-gluon scattering amplitudes in QCD at one-loop.
[ { "version": "v1", "created": "Tue, 15 Jan 2008 09:33:20 GMT" } ]
2009-09-17T00:00:00
[ [ "Giele", "Walter T.", "" ], [ "Kunszt", "Zoltan", "" ], [ "Melnikov", "Kirill", "" ] ]
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801.2238
Efremov Anatoly
A.V. Efremov, K.Goeke and P.Schweitzer
Sivers and Collins Single Spin Asymmetries
9 pages, 23 eps figures. Talk at XII Workshop on High Energy Spin Physics (DSPIN-07), Dubna, Sept. 3-7, 2007 and at ASI - SYMMETRIES AND SPIN (SPIN-Praha-2007), Prague, July 8 - 14, 2007
Eur.Phys.J.ST162:1-11,2008
10.1140/epjst/e2008-00768-9
null
hep-ph
null
The Sivers and Collins asymmetries are the most prominent Single Spin Asymmetries (SSA)in Semi-Inclusive Deeply Inelastic Scattering (SIDIS)with transverse target polarization. In this talk we present our understanding of these phenomena.
[ { "version": "v1", "created": "Tue, 15 Jan 2008 09:40:58 GMT" }, { "version": "v2", "created": "Mon, 21 Jan 2008 12:50:49 GMT" } ]
2008-12-18T00:00:00
[ [ "Efremov", "A. V.", "" ], [ "Goeke", "K.", "" ], [ "Schweitzer", "P.", "" ] ]
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801.2239
Tomoki Nakanishi
Wakako Nakai, Tomoki Nakanishi
On Frenkel-Mukhin algorithm for q-character of quantum affine algebras
19 pages, minor corrections (Remark 3.1, Eq (3.11), etc); final version to appear in Adv. Stud. in Pure Math., the proceedings volume for the workshop "Exploration of New Structures and Natural Constructions in Mathematical Physics", Nagoya, 2007
Adv. Stud. Pure Math. 61 (2011) 327--347
null
null
math.QA
null
The q-character is a strong tool to study finite-dimensional representations of quantum affine algebras. However, the explicit formula of the q-character of a given representation has not been known so far. Frenkel and Mukhin proposed the iterative algorithm which generates the q-character of a given irreducible representation starting from its highest weight monomial. The algorithm is known to work for various classes of representations. In this note, however, we give an example in which the algorithm fails to generate the q-character.
[ { "version": "v1", "created": "Tue, 15 Jan 2008 09:43:44 GMT" }, { "version": "v2", "created": "Sun, 11 May 2008 05:56:56 GMT" } ]
2012-03-21T00:00:00
[ [ "Nakai", "Wakako", "" ], [ "Nakanishi", "Tomoki", "" ] ]
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801.224
Rui Guo
Rui Guo, Xiaoji Zhou, Xuzong Chen
High momentum entanglement of cold atoms generated by a single photon scattering
4 pages, 5 figures
null
null
null
quant-ph
null
With the mechanism of pairwise scattering of photons between two atoms, we propose a novel scheme to highly entangle the motional state between two ultracold neutral atoms by a single photon scattering and detection. Under certain conditions, it is shown that an arbitrary amount of entanglement can be obtained with this scheme.
[ { "version": "v1", "created": "Tue, 15 Jan 2008 09:50:12 GMT" } ]
2008-01-16T00:00:00
[ [ "Guo", "Rui", "" ], [ "Zhou", "Xiaoji", "" ], [ "Chen", "Xuzong", "" ] ]
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801.2241
Cyril Branciard
Cyril Branciard, Nicolas Brunner, Nicolas Gisin, Christian Kurtsiefer, Antia Lamas-Linares, Alexander Ling, and Valerio Scarani
Testing quantum correlations versus single-particle properties within Leggett's model and beyond
9 pages, 5 figures
Nature Physics 4, 681 - 685 (2008)
10.1038/nphys1020
null
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Quantum theory predicts and experiments confirm that nature can produce correlations between distant events that are nonlocal in the sense of violating a Bell inequality. Nevertheless, Bell's strong sentence {\it Correlations cry out for explanations} remains relevant. The maturing of quantum information science and the discovery of the power of nonlocal correlations, e.g. for cryptographic key distribution beyond the standard Quantum Key Distribution schemes, strengthen Bell's wish and make it even more timely. In 2003, Leggett proposed an alternative model for nonlocal correlations [Found. Phys. 33, 1469 (2003)], that he proved to be incompatible with quantum predictions. We present here a new approach to this model, along with new inequalities for testing it. Remarkably these inequalities can be derived in a very simple way, assuming only the non-negativity of probability distributions; they are also stronger than previously published Leggett-type inequalities. The simplest of these inequalities is experimentally violated. Then we go beyond Leggett's model, and show that one cannot ascribe even partially defined individual properties to the components of a maximally entangled pair.
[ { "version": "v1", "created": "Tue, 15 Jan 2008 09:53:25 GMT" }, { "version": "v2", "created": "Tue, 14 Apr 2009 10:48:14 GMT" } ]
2009-11-13T00:00:00
[ [ "Branciard", "Cyril", "" ], [ "Brunner", "Nicolas", "" ], [ "Gisin", "Nicolas", "" ], [ "Kurtsiefer", "Christian", "" ], [ "Lamas-Linares", "Antia", "" ], [ "Ling", "Alexander", "" ], [ "Scarani", "Valerio", "" ] ]
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801.2242
Masahito Hayashi
Masahito Hayashi
Information Spectrum Approach to Second-Order Coding Rate in Channel Coding
null
IEEE Transactions on Information Theory Volume 55, Issue 11, 4947 - 4966 (2009)
10.1109/TIT.2009.2030478
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Second-order coding rate of channel coding is discussed for general sequence of channels. The optimum second-order transmission rate with a constant error constraint $\epsilon$ is obtained by using the information spectrum method. We apply this result to the discrete memoryless case, the discrete memoryless case with a cost constraint, the additive Markovian case, and the Gaussian channel case with an energy constraint. We also clarify that the Gallager bound does not give the optimum evaluation in the second-order coding rate.
[ { "version": "v1", "created": "Tue, 15 Jan 2008 10:00:46 GMT" }, { "version": "v2", "created": "Fri, 22 Aug 2008 06:34:05 GMT" } ]
2016-11-15T00:00:00
[ [ "Hayashi", "Masahito", "" ] ]
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801.2243
Eric Jaligot
Eric Jaligot (ICJ)
Cosets, genericity, and the Weyl group
null
null
null
null
math.GR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We prove a non-generosity theorem for proper cosets in groups of finite Morley rank and elaborate on the theory of Weyl groups in this context.
[ { "version": "v1", "created": "Tue, 15 Jan 2008 10:01:00 GMT" }, { "version": "v2", "created": "Mon, 19 May 2008 15:40:50 GMT" }, { "version": "v3", "created": "Fri, 12 Sep 2008 18:53:44 GMT" } ]
2008-09-12T00:00:00
[ [ "Jaligot", "Eric", "", "ICJ" ] ]
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801.2244
Pranav Saxena
N.K. Sharma, Pranav Saxena (Rajasthan University), Prachi Parashar (Oklahoma University), Ashok K. Nagawat, Sardar Singh (Rajasthan University)
Low energy theorems and the unitarity bounds in the extra U(1) superstring inspired E6 models
57 Pages, 13 Tables, 7 Figs.; PACS: 12.10.Dm, 12.60.Cn; http://link.aps.org/abstract/PRD/v72/e095016
Phys.Rev.D72:095016,2005
10.1103/PhysRevD.72.095016
null
hep-ph
null
The conventional method using low energy theorems [3] does not seem to lead to an explicit unitarity limit in the scattering processes of longitudinally polarized gauge bosons for the high energy case in the extra U(1) superstring inspired models, commonly known as eta model, emanating from E6 group of superstring theory. We have made use of an alternative procedure given in [14], which is applicable to SUSY GUT. Explicit unitarity bounds on the Yukawa couplings are obtained from both using unitarity constraints as well as using RGE analysis at one-loop level utilizing critical couplings concepts implying divergence of scalar coupling at MG. These are found to be consistent with finiteness over the entire range MZ<=sqrt(s)<=MG. For completeness, the similar approach has been made use of in other models, i.e., chi, psi, and nu models emanating from E6 and it has been noticed that at weak scale, the unitarity bounds on Yukawa couplings do not differ among E6 extra U(1) models significantly except for the case of chi model in 16 representations. Theoretically we have obtained the upper bounds on top quark and lightest neutral higgs boson mass using the unitarity constrained superpotential couplings and also obtained the D-quark mass as a function of MZ2 is O(3 TeV) for MZ2 is O(1 TeV). The obtained bounds on these physical parameters are found consistent with the present day experimental precision measurements.
[ { "version": "v1", "created": "Tue, 15 Jan 2008 10:01:19 GMT" } ]
2008-11-26T00:00:00
[ [ "Sharma", "N. K.", "", "Rajasthan University" ], [ "Saxena", "Pranav", "", "Rajasthan University" ], [ "Parashar", "Prachi", "", "Oklahoma University" ], [ "Nagawat", "Ashok K.", "", "Rajasthan University" ], [ "Singh", "Sardar", "", "Rajasthan University" ] ]
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801.2245
Oleg Kochukhov
T. Ryabchikova, O. Kochukhov, S. Bagnulo
Isotopic anomaly and stratification of Ca in magnetic Ap stars
13 pages, 10 figures; accepted for publication in Astronomy & Astrophysics
null
10.1051/0004-6361:20077834
null
astro-ph
null
We have carried out an accurate investigation of the Ca isotopic composition and stratification in the atmospheres of 23 magnetic chemically peculiar (Ap) stars of different temperature and magnetic field strength. With the UVES spectrograph at the 8m ESO VLT, we have obtained high-resolution spectra of Ap stars in the wavelength range 3000-10000 A. Using a detailed spectrum synthesis calculations, we have reproduced a variety of Ca lines in the optical and ultraviolet spectral regions, inferring the overall vertical distribution of Ca abundance, then we have deduced the relative isotopic composition and its dependence on height using the profile of the the IR-triplet Ca II line at lambda 8498 A. In 22 out of 23 studied stars, we found that Ca is strongly stratified, being usually overabundant by 1.0-1.5 dex below log tau_5000 ~ -1, and strongly depleted above log tau_5000 = -1.5. The IR-triplet Ca II line at lambda 8498 A reveals a significant contribution of the heavy isotopes 46Ca and 48Ca, which represent less than 1% of the terrestrial Ca isotopic mixture. We confirm our previous finding that the presence of heavy Ca isotopes is generally anticorrelated with the magnetic field strength. Moreover, we discover that in Ap stars with relatively small surface magnetic fields (<=4-5 kG), the light isotope 40Ca is concentrated close to the photosphere, while the heavy isotopes are dominant in the outer atmospheric layers. This vertical isotopic separation, observed for the first time for any metal in a stellar atmosphere, disappears in stars with magnetic field strength above 6-7 kG. We suggest that the overall Ca stratification and depth-dependent isotopic anomaly observed in Ap stars may be attributed to a combined action of the radiatively-driven diffusion and light-induced drift.
[ { "version": "v1", "created": "Tue, 15 Jan 2008 10:02:00 GMT" } ]
2009-11-13T00:00:00
[ [ "Ryabchikova", "T.", "" ], [ "Kochukhov", "O.", "" ], [ "Bagnulo", "S.", "" ] ]
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801.2246
X.R. Wang
X. R. Wang
Light emitting diodes of inverse spin valves
null
null
10.1155/2008/434936
null
cond-mat.mtrl-sci cond-mat.mes-hall
null
We propose making light emitting diodes out of inverse spin valves. The proposed diodes rely on the spin-dependent electron transport of inverse spin valves that are layered structures of a ferromagnetic half-metal sandwiched between two non-magnetic metals. Under a bias, a giant spin-dependent chemical potential difference between spin-up and spin-down electrons is created. Thus, the inverse spin valves are possible to emit light when electrons in higher chemical potential go to the lower chemical potential. The advantages of this type of light emitting diodes include tunableness and less demand on materials.
[ { "version": "v1", "created": "Tue, 15 Jan 2008 10:03:23 GMT" } ]
2015-05-13T00:00:00
[ [ "Wang", "X. R.", "" ] ]
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801.2247
Gemma Colom\'e-Nin
Gemma Colom\'e-Nin and Juan Elias
Cohomological properties of non-standard multigraded modules
null
null
null
null
math.AC
null
In this paper we study some cohomological properties of non-standard multigraded modules and Veronese transforms of them. Among others numerical characters, we study the generalized depth of a module and we see that it is invariant by taking a Veronese transform. We prove some vanishing theorems for the local cohomology modules of a multigraded module; as a corollary of these results we get that the depth of a Veronese module is asymptotically constant.
[ { "version": "v1", "created": "Tue, 15 Jan 2008 10:03:32 GMT" } ]
2008-01-16T00:00:00
[ [ "Colomé-Nin", "Gemma", "" ], [ "Elias", "Juan", "" ] ]
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801.2248
Sebastien Boyaval
S\'ebastien Boyaval (INRIA Rocquencourt, CERMICS), Tony Leli\`evre (INRIA Rocquencourt, CERMICS), Claude Mangoubi (INRIA Rocquencourt, CERMICS)
Free-energy-dissipative schemes for the Oldroyd-B model
null
null
null
null
math.NA
null
In this article, we analyze the stability of various numerical schemes for differential models of viscoelastic fluids. More precisely, we consider the prototypical Oldroyd-B model, for which a free energy dissipation holds, and we show under which assumptions such a dissipation is also satisfied for the numerical scheme. Among the numerical schemes we analyze, we consider some discretizations based on the log-formulation of the Oldroyd-B system proposed by Fattal and Kupferman, which have been reported to be numerically more stable than discretizations of the usual formulation in some benchmark problems. Our analysis gives some tracks to understand these numerical observations.
[ { "version": "v1", "created": "Tue, 15 Jan 2008 12:58:46 GMT" } ]
2009-04-20T00:00:00
[ [ "Boyaval", "Sébastien", "", "INRIA Rocquencourt, CERMICS" ], [ "Lelièvre", "Tony", "", "INRIA Rocquencourt, CERMICS" ], [ "Mangoubi", "Claude", "", "INRIA Rocquencourt, CERMICS" ] ]
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801.2249
Van An Dinh
Van An Dinh, Masayuki Toyoda, Kazunori Sato and Hiroshi Katayama-Yoshida
Exchange Interaction and $T_c$ in Alkaline-earth-metal-oxide-based DMS without Magnetic Impurities: First Principle Pseudo-SIC and Monte Carlo Calculation
5 pages, 5 figures
J. Phys. Soc. Jpn. 75 (2006) 093705
10.1143/JPSJ.75.093705
null
cond-mat.mtrl-sci cond-mat.dis-nn
null
The prospects of half-metallic ferromagnetism being induced by the incorporation of C atoms into alkaline-earth-metal-oxides are investigated by the first principle calculation. The origin of the ferromagnetism is discussed through the calculation of the electronic structure and exchange coupling constant by using the pseudo-potential-like self-interaction-corrected local spin density method. The Curie temperature ($T_c$) is also predicted by employing the Monte Carlo simulation. It is shown that by taking the electron self-interaction into account, the half-metallic ferromagnetism induced by C in the host materials is more stabilized in comparison with the standard LDA case, and the C's $2p$ electron states in the bandgap become more localized resulting in the predominance of the short-ranged exchange interaction. While the ferromagnetism in MgO$_{1-x}$C$_x$ is stabilized due to the exchange interaction of the $1st$-nearest neighbor pairs and might be suppressed by the anti-ferromagnetic super-exchange interaction at higher $x$, the ferromagnetism in CaO$_{1-x}$C$_x$, SrO$_{1-x}$C$_x$, and BaO$_{1-x}$C$_x$ is stabilized by both the $1st$- and $2nd$-nearest neighbor pairs, and $T_c$ monotonously increases with the C concentration.
[ { "version": "v1", "created": "Tue, 15 Jan 2008 10:07:55 GMT" } ]
2008-01-16T00:00:00
[ [ "Dinh", "Van An", "" ], [ "Toyoda", "Masayuki", "" ], [ "Sato", "Kazunori", "" ], [ "Katayama-Yoshida", "Hiroshi", "" ] ]
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801.225
Asuka Takatsu
Asuka Takatsu
On Wasserstein geometry of the space of Gaussian measures
15pages, 1figures
null
null
null
math.DG math.PR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The space of Gaussian measures on a Euclidean space is geodesically convex in the $L^2$-Wasserstein space. This space is a finite dimensional manifold since Gaussian measures are parameterized by means and covariance matrices. By restricting to the space of Gaussian measures inside the $L^2$-Wasserstein space, we manage to provide detailed descriptions of the $L^2$-Wasserstein geometry from a Riemannian geometric viewpoint. We first construct a Riemannian metric which induces the $L^2$-Wasserstein distance. Then we obtain a formula for the sectional curvatures of the space of Gaussian measures, which is written out in terms of the eigenvalues of the covariance matrix.
[ { "version": "v1", "created": "Tue, 15 Jan 2008 10:32:17 GMT" }, { "version": "v2", "created": "Wed, 6 Feb 2008 15:41:39 GMT" }, { "version": "v3", "created": "Wed, 11 Feb 2009 09:50:31 GMT" } ]
2009-02-11T00:00:00
[ [ "Takatsu", "Asuka", "" ] ]
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801.2251
Evgeny Komarov
E.V.Komarov, Yu.A.Simonov
Theory of Quark-Gluon Plasma and Phase Transition
6 pages,5 figures; talk given at "13th Lomonosov Conference on Elementary Particle Physics", Moscow, August 23 -- 29, 2007; new reference added
null
10.1142/9789812837592_0054
null
hep-ph
null
Nonperturbative picture of strong interacting quark-gluon plasma is given based on the systematic Field Correlator Method. Equation of state, phase transition in density-temperature plane is derived and compared to lattice data as well as subsequent thermodynamical quantities of QGP.
[ { "version": "v1", "created": "Tue, 15 Jan 2008 11:18:50 GMT" }, { "version": "v2", "created": "Thu, 24 Jan 2008 12:32:52 GMT" } ]
2017-08-23T00:00:00
[ [ "Komarov", "E. V.", "" ], [ "Simonov", "Yu. A.", "" ] ]
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801.2252
Iosif Galanakis
K. Ozdogan, E. Sasioglu and I. Galanakis
Fundamentals of half-metallic Full-Heusler alloys
Submitted for a book entitled "Spintronics: Materials, Applications and Devices" to be published by Nova Publishers
null
null
null
cond-mat.mtrl-sci
null
Intermetallic Heusler alloys are amongst the most attractive half-metallic systems due to the high Curie temperatures and the structural similarity to the binary semiconductors. In this review we present an overview of the basic electronic and magnetic properties of the half-metallic full-Heusler alloys like Co$_2$MnGe. Ab-initio results suggest that the electronic and magnetic properties in these compounds are intrinsically related to the appearance of the minority-spin gap. The total spin magnetic moment in the unit cell, $M_t$, scales linearly with the number of the valence electrons, $Z_t$, such that $M_t=Z_t-24$ for the full-Heusler alloys opening the way to engineer new half-metallic alloys with the desired magnetic properties. Moreover we present analytical results on the disorder in Co$_2$Cr(Mn)Al(Si) alloys, which is susceptible to destroy the perfect half-metallicity of the bulk compounds and thus degrade the performance of devices. Finally we discuss the appearance of the half-metallic ferrimagnetism due to the creation of Cr(Mn) antisites in these compounds and the Co-doping in Mn$_2$VAl(Si) alloys which leads to the fully-compensated half-metallic ferrimagnetism.
[ { "version": "v1", "created": "Tue, 15 Jan 2008 11:03:46 GMT" } ]
2008-01-16T00:00:00
[ [ "Ozdogan", "K.", "" ], [ "Sasioglu", "E.", "" ], [ "Galanakis", "I.", "" ] ]
[ 0.0423779152, 0.0209284369, -0.0035232224, -0.0372419506, 0.0295007862, -0.0020640006, 0.0210028719, 0.0220573582, 0.035753265, -0.0542874001, 0.0288308766, -0.1377530396, 0.0004849859, -0.0484815277, -0.0706133172, -0.0187450331, -0.0397975259, -0.0071705021, 0.0464966111, -0.0170950722, 0.0352074131, 0.0310142823, -0.0206927285, 0.0903632119, -0.0290293675, 0.01087981, 0.1116514131, 0.0709110573, 0.0961690843, -0.0042334497, 0.1393409669, -0.0156808216, -0.034165334, -0.1066891328, -0.1293171495, 0.1322945207, 0.0474146344, 0.0344630703, -0.056768544, 0.0164623819, 0.0256053917, 0.0761214569, 0.0010924781, 0.0119529041, -0.0396486595, 0.0328503288, 0.029823333, 0.098650232, 0.0586045869, 0.0200972557, -0.0653036758, 0.0180379059, 0.0518062562, -0.0492754914, 0.0145891188, 0.0332473107, -0.0371675156, 0.0533445664, -0.0008970881, 0.0179262552, -0.052699469, -0.0877828225, -0.0099431789, 0.0112333726, 0.0055515566, -0.0212261751, -0.0468439721, -0.0762206987, 0.1912464648, 0.0849047005, -0.0199980084, -0.0714569092, 0.0003756605, 0.0043295939, -0.1081778184, -0.0288556889, 0.0168841761, -0.0062214648, -0.0061346251, 0.0653036758, -0.058554966, -0.0044691581, 0.0176657345, -0.0501190796, 0.0144402497, -0.028036911, 0.0000701698, -0.059646666, -0.0355547741, -0.1170106828, -0.0191544201, -0.0311135277, -0.0369442143, 0.0455041565, -0.0036565838, -0.0837633759, -0.0145270899, -0.0655517876, 0.0408396088, 0.1044064835, -0.02644898, -0.0082187848, 0.0606391244, -0.0006419956, 0.1503572464, -0.0593489297, -0.0133857643, -0.0632691383, -0.0904624611, -0.0401696973, 0.1066891328, -0.0428989567, 0.0344630703, -0.0018453498, -0.070861429, -0.043320749, -0.0601925179, -0.0480101109, -0.0229877867, 0.1307065934, -0.1519451737, 0.0387554467, 0.0076357163, -0.0521039926, -0.0120211355, -0.0751289949, -0.0145891188, -0.0781559944, -0.090015851, -0.0548828728, -0.0255061463, 0.0779078752, -0.0917030275, 0.0189807415, -0.0980547518, 0.0377133675, 0.0297737103, -0.0714072809, 0.0205190498, 0.0578106232, -0.041112531, -0.11611747, 0.1243548691, -0.0265978482, 0.0194025356, 0.047191333, 0.0262504891, 0.0598947816, 0.010302945, 0.0296744648, 0.0128523186, -0.1003374085, 0.1258435547, -0.0148620438, 0.0250471346, -0.0413854569, -0.0451567955, 0.0108549986, 0.036026191, -0.0751289949, 0.1261412948, 0.0559249558, -0.0062990007, -0.0135966614, 0.0993449464, 0.0055081365, -0.0948788896, 0.006922388, -0.0405418687, -0.0410132855, 0.0459507592, -0.0805875137, -0.04905219, 0.0114008505, 0.1524413973, 0.0327262692, -0.0502431393, -0.135271892, -0.1027192995, 0.0986006036, 0.0331480652, 0.0340660885, -0.0106192902, 0.012256844, -0.0167601183, -0.0214742888, -0.0200724434, 0.0814310983, -0.0052321092, 0.0411621556, -0.0076853391, 0.0261512436, 0.0027090975, -0.00922985, -0.0558257066, -0.1210797578, 0.0694719926, 0.0838626176, 0.0704148263, 0.0678840578, -0.0654029176, 0.0975089073, 0.1110559404, 0.0175664891, -0.0830190331, 0.0359517559, -0.0088700848, -0.0087832445, -0.0082994215, 0.0149116665, -0.0145891188, 0.0688268989, 0.0815303475, 0.0263497345, 0.0683306679, -0.0605398789, -0.1302103698, -0.0037527282, 0.040095266, 0.1277292222, 0.0389787517, -0.0612346008, -0.082373932, 0.0203825869, -0.0289053116, 0.0780567452, -0.0692735016, 0.0363239273, 0.0555279702, -0.0422290452, 0.0237197224, -0.0180751234, -0.0397975259, 0.0545355156, -0.1221714616, 0.0128026959, 0.0556272157, 0.0114442706, -0.0266226605, -0.0858475342, -0.1172091737, 0.0801409036, -0.0220077354, 0.0896188691, -0.0508634225, 0.0621774346, -0.0450327396, -0.0194397513, 0.1454942077, 0.0207795687, -0.0203453694, 0.0486800186, 0.0418816879, 0.1449979693, -0.0797935426, -0.0074434276 ]
801.2253
Rachid Ahl Laamara
T. Lhallabi and A. Moujib
Integrability and Generalized Monodromy Matrix
13 pages, No figures
Phys.Rev.D76:064036,2007
10.1103/PhysRevD.76.064036
null
hep-th
null
We construct the Generalized Monodromy matrix $\mathcal{\hat{M}}(\omega)$ of two dimensional string effective action by introducing the T-duality group properties.The integrability conditions with general solutions depending on spectral parameter are given. This construction is investigated for the exactly solvable Wess, Zumino, Novikov and Witten (WZNW) model in pp-wave Limit when B=0.
[ { "version": "v1", "created": "Tue, 15 Jan 2008 10:47:05 GMT" } ]
2008-11-26T00:00:00
[ [ "Lhallabi", "T.", "" ], [ "Moujib", "A.", "" ] ]
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801.2254
Masaaki Matsuda
M. Matsuda, M. Fujita, S. Wakimoto, J. A. Fernandez-Baca, J. M. Tranquada and K. Yamada
Magnetic Excitations of the Diagonal Incommensurate Phase in Lightly-Doped La2-xSrxCuO4
4 pages, 5 figures
null
10.1103/PhysRevLett.101.197001
null
cond-mat.str-el cond-mat.mtrl-sci
null
We present inelastic neutron scattering experiments on a single-domain crystal of lightly-doped La1.96Sr0.04CuO4. We find that the magnetic excitation spectrum in this insulating phase with a diagonal incommensurate spin modulation is remarkably similar to that in the superconducting regime, where the spin modulation is bond parallel. In particular, we find that the dispersion slope at low energy is essentially independent of doping and temperature over a significant range. The energy at which the excitations cross the commensurate antiferromagnetic wave vector increases roughly linearly with doping through the underdoped regime.
[ { "version": "v1", "created": "Tue, 15 Jan 2008 10:47:23 GMT" } ]
2009-11-13T00:00:00
[ [ "Matsuda", "M.", "" ], [ "Fujita", "M.", "" ], [ "Wakimoto", "S.", "" ], [ "Fernandez-Baca", "J. A.", "" ], [ "Tranquada", "J. M.", "" ], [ "Yamada", "K.", "" ] ]
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801.2255
Armando Gil de Paz
A. Gil de Paz, D. A. Thilker, L. Bianchi, A. Aragon-Salamanca, S. Boissier, B. F. Madore, C. Diaz-Lopez, I. Trujillo, M. Pohlen, P. Erwin, J. Zamorano, J. Gallego, J. Iglesias-Paramo, J. M. Vilchez, M. Molla, J. C. Munoz-Mateos, P. G. Perez-Gonzalez, S. Pedraz, K. Sheth, R. C. Kennicutt Jr, R. Swaters, and the GALEX Science Team
Extended UV (XUV) Emission in Nearby Galaxy Disks
4 pages, 2 figures, to appear in the proceedings of "The Formation and Evolution of Galaxy Disks", Rome 2007, organized by the Vatican Observatory, editors J. G. Funes, S.J. and E. M. Corsini
null
null
null
astro-ph
null
We summarize the main properties of the extended UV (XUV) emission found in roughly 30% of the nearby spiral galaxies observed by the GALEX satellite. Two different classes of XUV disks are identified, the Type 1 XUV disks where significant, structured UV-bright features are found beyond the "classical" azimuthally-averaged star-formation threshold, and the Type 2 XUV disks, which are characterized by very extended (seven times the area where most of the stellar mass is found), blue [(FUV-K)<5mag] outer disks. These latter disks are extreme examples of galaxies growing inside-out. The few XUV disks studied in detail to date are rich in HI but relatively poor in molecular gas, have stellar populations with luminosity-weighted ages of ~1 Gyr, and ionized-gas metal abundances of ~Zsun/10. As part of the CAHA-XUV project we are in the process of obtaining deep multi-wavelength imaging and spectroscopy of 65 XUV-disk galaxies so to determine whether or not these properties are common among XUV disks.
[ { "version": "v1", "created": "Tue, 15 Jan 2008 11:03:16 GMT" } ]
2008-01-16T00:00:00
[ [ "de Paz", "A. Gil", "" ], [ "Thilker", "D. A.", "" ], [ "Bianchi", "L.", "" ], [ "Aragon-Salamanca", "A.", "" ], [ "Boissier", "S.", "" ], [ "Madore", "B. F.", "" ], [ "Diaz-Lopez", "C.", "" ], [ "Trujillo", "I.", "" ], [ "Pohlen", "M.", "" ], [ "Erwin", "P.", "" ], [ "Zamorano", "J.", "" ], [ "Gallego", "J.", "" ], [ "Iglesias-Paramo", "J.", "" ], [ "Vilchez", "J. M.", "" ], [ "Molla", "M.", "" ], [ "Munoz-Mateos", "J. C.", "" ], [ "Perez-Gonzalez", "P. G.", "" ], [ "Pedraz", "S.", "" ], [ "Sheth", "K.", "" ], [ "Kennicutt", "R. C.", "Jr" ], [ "Swaters", "R.", "" ], [ "Team", "the GALEX Science", "" ] ]
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801.2256
Shmuel Friedland
S. Friedland, E. Krop and K. Markstr\"om
On the Number of Matchings in Regular Graphs
26 pages, 4 figures
null
null
null
math.CO
null
For the set of graphs with a given degree sequence, consisting of any number of $2's$ and $1's$, and its subset of bipartite graphs, we characterize the optimal graphs who maximize and minimize the number of $m$-matchings. We find the expected value of the number of $m$-matchings of $r$-regular bipartite graphs on $2n$ vertices with respect to the two standard measures. We state and discuss the conjectured upper and lower bounds for $m$-matchings in $r$-regular bipartite graphs on $2n$ vertices, and their asymptotic versions for infinite $r$-regular bipartite graphs. We prove these conjectures for 2-regular bipartite graphs and for $m$-matchings with $m\le 4$.
[ { "version": "v1", "created": "Tue, 15 Jan 2008 10:50:51 GMT" } ]
2008-01-16T00:00:00
[ [ "Friedland", "S.", "" ], [ "Krop", "E.", "" ], [ "Markström", "K.", "" ] ]
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801.2257
Sami Dib
Sami Dib (1,2,4), Axel Brandenburg (3), Jongsoo Kim (4), Maheswar Gopinathan (4,5), Philippe Andre (2) ((1) CEA Saclay, (2) Lebanese U., (3) NORDITA, (4) KASI, (5) ARIES)
Core Mass Function: The Role of Gravity
13 pages, 4 figures, accepted to ApJ Letters. An additional simulation has been added. The sign of the beta values in Fig. 1 changed to fit their definition in the text. The main conclusions, however unchanged, are better clarified
null
10.1086/588608
null
astro-ph
null
We analyze the mass distribution of cores formed in an isothermal, magnetized, turbulent, and self-gravitating nearly critical molecular cloud model. Cores are identified at two density threshold levels. Our main results are that the presence of self-gravity modifies the slopes of the core mass function (CMF) at the high mass end. At low thresholds, the slope is shallower than the one predicted by pure turbulent fragmentation. The shallowness of the slope is due to the effects of core coalescence and gas accretion. Most importantly, the slope of the CMF at the high mass end steepens when cores are selected at higher density thresholds, or alternatively, if the CMF is fitted with a log-normal function, the width of the lognormal distribution decreases with increasing threshold. This is due to the fact that gravity plays a more important role in denser structures selected at higher density threshold and leads to the conclusion that the role of gravity is essential in generating a CMF that bears more resemblance with the IMF when cores are selected with an increasing density threshold in the observations.
[ { "version": "v1", "created": "Tue, 15 Jan 2008 10:51:48 GMT" }, { "version": "v2", "created": "Wed, 16 Jan 2008 07:08:33 GMT" }, { "version": "v3", "created": "Wed, 26 Mar 2008 14:25:36 GMT" }, { "version": "v4", "created": "Wed, 2 Apr 2008 19:15:13 GMT" } ]
2009-11-13T00:00:00
[ [ "Dib", "Sami", "" ], [ "Brandenburg", "Axel", "" ], [ "Kim", "Jongsoo", "" ], [ "Gopinathan", "Maheswar", "" ], [ "Andre", "Philippe", "" ] ]
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801.2258
N. W. Evans
E.M. Shin (Cambridge), N.W. Evans (Cambridge)
The Effect of Satellite Galaxies on Gravitational Lensing Flux Ratios
10 pages, 14 figures, MNRAS, in press
null
10.1111/j.1365-2966.2008.12971.x
null
astro-ph
null
Gravitational lenses with anomalous flux ratios are often cited as possible evidence for dark matter satellites predicted by simulations of hierarchical merging in cold dark matter cosmogonies. We show that the fraction of quads with anomalous flux ratios depends primarily on the total mass and spatial extent of the satellites, and the characteristic lengthscale R of their distribution. If R is 100 kpc, then for a moderately elliptical galaxy with a line-of-sight velocity dispersion of 250 km/s, a mass of 3 x 10^9 solar masses in highly-concentrated (Plummer model) satellites is needed for 20% of quadruplets to show anomalous flux ratios, rising to 1.25 x 10^10 solar masses for 50%. Several times these masses are required if the satellites have more extended Hernquist profiles. Compared to a typical elliptical, the flux ratios of quads formed by typical edge-on disc galaxies with maximum discs are significantly less susceptible to changes through substructure -- three times the mass in satellite galaxies is needed to affect 50% of the systems. In many of the lens systems with anomalous flux ratios, there is evidence for visible satellites (e.g., B2045+265 or MG0414+0534). We show that optically identified substructure should not be preponderant among lens systems with anomalies. There are two possible resolutions of this difficulty. First, in some cases, visible substructure may be projected within or close to the Einstein radius and wrongly ascribed as the culprit, whereas dark matter substructure is causing the flux anomaly. Second, bright satellites, in which baryon cooling and condensation has taken place, may have higher central densities than dark satellites, rendering them more efficient at causing flux anomalies.
[ { "version": "v1", "created": "Tue, 15 Jan 2008 10:58:54 GMT" }, { "version": "v2", "created": "Wed, 16 Jan 2008 12:41:42 GMT" } ]
2009-11-13T00:00:00
[ [ "Shin", "E. M.", "", "Cambridge" ], [ "Evans", "N. W.", "", "Cambridge" ] ]
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801.2259
Wilhelm Winter
Mikael Rordam and Wilhelm Winter
The Jiang-Su algebra revisited
22 pages
null
null
null
math.OA math.KT
null
We give a number of new characterizations of the Jiang-Su algebra Z, both intrinsic and extrinsic, in terms of C*-algebraic, dynamical, topological and K-theoretic conditions. Along the way we study divisibility properties of C*-algebras, we give a precise characterization of those unital C*-algebras of stable rank one that admit a unital embedding of the dimension-drop C*-algebra Z_{n,n+1}, and we prove a cancellation theorem for the Cuntz semigroup of C*-algebras of stable rank one.
[ { "version": "v1", "created": "Tue, 15 Jan 2008 11:01:40 GMT" } ]
2008-01-16T00:00:00
[ [ "Rordam", "Mikael", "" ], [ "Winter", "Wilhelm", "" ] ]
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801.226
Marcello Rosini
Angelo Guida, Lino Reggiani and Marcello Rosini
High-field transport in semiconductor superlattices for interacting Wannier-Stark levels
null
null
10.1016/j.spmi.2008.05.003
null
cond-mat.other
null
We develop a microscopic theory of electron transport in superlattices within the Wannier-Stark approach by including the interaction associated with Zener tuneling among the energy levels pertaining to adjacent quantum wells. By using a Monte Carlo technique we have simulated the hopping motion associated with absorption and emission of polar optical phonons and determined the main transport parameters for the case of a GaAs/GaAlAs structure at room temperature. The interaction among the levels is found to be responsible for a systematic increase of the level energy with respect to the bottom of the quantum well at electric fields above about 20 kV/cm. When compared with the non-interacting case, at the highest fields the average carrier energy evidences a consistent increase which leads to a significant softening of the negative differential value of both the drift velocity and diffusivity.
[ { "version": "v1", "created": "Tue, 15 Jan 2008 11:01:56 GMT" } ]
2009-11-13T00:00:00
[ [ "Guida", "Angelo", "" ], [ "Reggiani", "Lino", "" ], [ "Rosini", "Marcello", "" ] ]
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801.2261
Vittoria Colizza
Vittoria Colizza, Alain Barrat, Marc Barthelemy, Alessandro Vespignani
Predictability and epidemic pathways in global outbreaks of infectious diseases: the SARS case study
21 pages, 2 tables, 7 figures
BMC Medicine 5, 34 (2007)
10.1186/1741-7015-5-34
null
q-bio.OT
null
Background: The global spread of the severe acute respiratory syndrome (SARS) epidemic has clearly shown the importance of considering the long-range transportation networks in the understanding of emerging diseases outbreaks. The introduction of extensive transportation data sets is therefore an important step in order to develop epidemic models endowed with realism. Methods: We develop a general stochastic meta-population model that incorporates actual travel and census data among 3 100 urban areas in 220 countries. The model allows probabilistic predictions on the likelihood of country outbreaks and their magnitude. The level of predictability offered by the model can be quantitatively analyzed and related to the appearance of robust epidemic pathways that represent the most probable routes for the spread of the disease. Results: In order to assess the predictive power of the model, the case study of the global spread of SARS is considered. The disease parameter values and initial conditions used in the model are evaluated from empirical data for Hong Kong. The outbreak likelihood for specific countries is evaluated along with the emerging epidemic pathways. Simulation results are in agreement with the empirical data of the SARS worldwide epidemic. Conclusions: The presented computational approach shows that the integration of long-range mobility and demographic data provides epidemic models with a predictive power that can be consistently tested and theoretically motivated. This computational strategy can be therefore considered as a general tool in the analysis and forecast of the global spreading of emerging diseases and in the definition of containment policies aimed at reducing the effects of potentially catastrophic outbreaks.
[ { "version": "v1", "created": "Tue, 15 Jan 2008 11:02:37 GMT" } ]
2008-01-16T00:00:00
[ [ "Colizza", "Vittoria", "" ], [ "Barrat", "Alain", "" ], [ "Barthelemy", "Marc", "" ], [ "Vespignani", "Alessandro", "" ] ]
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801.2262
Robin Zegers
Robin Zegers
Self-gravitating branes of codimension 4 in Lovelock gravity
22 pages
JHEP 0803:066,2008
10.1088/1126-6708/2008/03/066
DCPT-07/71
gr-qc hep-th
null
We construct a familly of exact solutions of Lovelock equations describing codimension four branes with discrete symmetry in the transverse space. Unlike what is known from pure Einstein gravity, where such brane solutions of higher codimension are singular, the solutions we find, for the complete Lovelock theory, only present removable singularities. The latter account for a localised tension-like energy-momentum tensor on the brane, in analogy with the case of a codimension two self-gravitating cosmic string in pure Einstein gravity. However, the solutions we discuss present two main distinctive features : the tension of the brane receives corrections from the induced curvature of the brane's worldsheet and, in a given Lovelock theory, the spectrum of possible values of the tension is discrete. These solutions provide a new framework for the study of higher codimension braneworlds.
[ { "version": "v1", "created": "Tue, 15 Jan 2008 11:05:42 GMT" } ]
2010-01-15T00:00:00
[ [ "Zegers", "Robin", "" ] ]
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801.2263
Maillard Gregory
G. Maillard and S. Sch\"opfer
A functional central limit theorem for regenerative chains
14 pages
null
null
null
math.PR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Using the regenerative scheme of Comets, Fern\'andez and Ferrari (2002), we establish a functional central limit theorem (FCLT) for discrete time stochastic processes (chains) with summable memory decay. Furthermore, under stronger assumptions on the memory decay, we identify the limiting variance in terms of the process only. As applications, we define classes of binary autoregressive processes and power-law Ising chains for which the FCLT is fulfilled.
[ { "version": "v1", "created": "Tue, 15 Jan 2008 11:10:28 GMT" }, { "version": "v2", "created": "Wed, 24 Sep 2008 16:44:32 GMT" } ]
2008-09-24T00:00:00
[ [ "Maillard", "G.", "" ], [ "Schöpfer", "S.", "" ] ]
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801.2264
Bogus{\l}aw Kamys
P. Rosenthal (1), H. Freiesleben (1 and 2), B. Gehrmann (1), I. Gotzhein (1), K. W. Potthast (1), B. Kamys (3), Z. Rudy (3) ((1) Institut fuer Experimentalphysik I, Ruhr-Universitaet-Bochum, Germany (2) Present address: Institut fuer Kern- und Teilchenphysik, Technische Universitaet Dresden, Germany, (3) Institute of Physics, Jagellonian University, Cracow, Poland)
Direct Nuclear Reactions in Lithium-Lithium Systems: 7Li+7Li at Elab = 2 - 16 MeV
PDF-LaTeX, 21 pages with 22 figures
Acta Phys.Polon.B41:845-874,2010
null
null
nucl-ex
null
Angular distributions of 7Li(7Li,t), (7Li,alpha) and (7Li,6He) reactions were measured for laboratory energies from 2 - 16 MeV. Exact finite range DWBA analyses were performed with the aim to identify contributions of direct processes and to investigate the applicability of DWBA to such few nucleon systems. It turned out that DWBA can be successfully applied to estimate differential and total cross sections of direct transfer processes in 7Li+7Li interaction. The direct mechanism was found to play a dominant role in most of these reactions but significant contributions of other, strongly energy dependent processes were also established. It is suggested that these processes might be due to isolated resonances superimposed on the backround of statistical fluctuations arising from interference of compound nucleus and direct transfer contributions.
[ { "version": "v1", "created": "Tue, 15 Jan 2008 19:24:54 GMT" } ]
2011-09-15T00:00:00
[ [ "Rosenthal", "P.", "", "1 and 2" ], [ "Freiesleben", "H.", "", "1 and 2" ], [ "Gehrmann", "B.", "" ], [ "Gotzhein", "I.", "" ], [ "Potthast", "K. W.", "" ], [ "Kamys", "B.", "" ], [ "Rudy", "Z.", "" ] ]
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801.2265
Jinhui Chen
J.H. Chen, F. Jin, D. Gangadharan, X.Z. Cai, H.Z. Huang, Y.G. Ma
Parton Distributions at Hadronization from Bulk Dense Matter Produced at RHIC
5 pages, 3 figures, two more paragraph added to address the referee's comment, figure updated to include the KET scale. Accepted version to appear in Phys. Rev. C
Phys.Rev.C78:034907,2008
10.1103/PhysRevC.78.034907
null
nucl-th nucl-ex
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present an analysis of $\Omega$, $\Xi$, $\Lambda$ and $\phi$ spectra from Au+Au collisions at $\sqrt{s_{NN}}=200$ GeV in terms of distributions of effective constituent quarks at hadronization. Consistency in quark ratios derived from various hadron spectra provides clear evidence for hadron formation dynamics as suggested by quark coalescence or recombination models. We argue that the constituent quark distribution reflects properties of the effective partonic degrees of freedom at hadronization. Experimental data indicate that strange quarks have a transverse momentum distribution flatter than that of up/down quarks consistent with hydrodynamic expansion in partonic phase prior to hadronization. After the AMPT model is tuned to reproduce the strange and up/down quark distributions, the model can describe the measured spectra of hyperons and $\phi$ mesons very well where hadrons are formed through dynamical coalescence.
[ { "version": "v1", "created": "Tue, 15 Jan 2008 11:49:56 GMT" }, { "version": "v2", "created": "Fri, 22 Aug 2008 02:04:51 GMT" } ]
2008-11-26T00:00:00
[ [ "Chen", "J. H.", "" ], [ "Jin", "F.", "" ], [ "Gangadharan", "D.", "" ], [ "Cai", "X. Z.", "" ], [ "Huang", "H. Z.", "" ], [ "Ma", "Y. G.", "" ] ]
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801.2266
Claudiu Genes
C. Genes, D. Vitali and P. Tombesi
Emergence of atom-light-mirror entanglement inside an optical cavity
null
Phys. Rev. A 77, 050307 (2008)
10.1103/PhysRevA.77.050307
null
quant-ph
null
We propose a scheme for the realization of a hybrid, strongly quantum-correlated system formed of an atomic ensemble surrounded by a high-finesse optical cavity with a vibrating mirror. We show that the steady state of the system shows tripartite and bipartite continuous variable entanglement in experimentally accessible parameter regimes, which is robust against temperature.
[ { "version": "v1", "created": "Tue, 15 Jan 2008 11:39:15 GMT" } ]
2009-11-13T00:00:00
[ [ "Genes", "C.", "" ], [ "Vitali", "D.", "" ], [ "Tombesi", "P.", "" ] ]
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801.2267
F. de los Santos
E. Romera and F. de los Santos
Identifying wave packet fractional revivals by means of information entropy
null
Physical Review Letters 99, 263601 (2007)
10.1103/PhysRevLett.99.263601
null
quant-ph physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Wave packet fractional revivals is a relevant feature in the long time scale evolution of a wide range of physical systems, including atoms, molecules and nonlinear systems. We show that the sum of information entropies in both position and momentum conjugate spaces is an indicator of fractional revivals by analyzing three different model systems: $(i)$ the infinite square well, $(ii)$ a particle bouncing vertically against a wall in a gravitational field, and $(iii)$ the vibrational dynamics of hydrogen iodide molecules. This description in terms of information entropies complements the usual one in terms of the autocorrelation function.
[ { "version": "v1", "created": "Tue, 15 Jan 2008 11:47:35 GMT" }, { "version": "v2", "created": "Fri, 19 Sep 2014 09:53:06 GMT" } ]
2014-09-22T00:00:00
[ [ "Romera", "E.", "" ], [ "Santos", "F. de los", "" ] ]
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801.2268
Evgeny Skvortsov D
E.D. Skvortsov
Mixed-Symmetry Massless Fields in Minkowski space Unfolded
59 pages; PDOF counting added; typos corrected
JHEP 0807:004,2008
10.1088/1126-6708/2008/07/004
null
hep-th
null
The unfolded formulation for arbitrary massless mixed-symmetry bosonic and fermionic fields in Minkowski space is constructed. The unfolded form is proved to be uniquely determined by the requirement that all gauge symmetries are manifest. The unfolded equations have the form of a covariant constancy condition. The gauge fields and gauge parameters are differential forms with values in certain irreducible Lorentz tensors. The unfolded equations for bosons determine completely those for fermions. The proposed unfolded formulation also contains dual formulations for massless mixed-symmetry fields.
[ { "version": "v1", "created": "Tue, 15 Jan 2008 17:28:46 GMT" }, { "version": "v2", "created": "Tue, 15 Jan 2008 21:29:04 GMT" }, { "version": "v3", "created": "Wed, 26 Mar 2008 09:59:48 GMT" }, { "version": "v4", "created": "Thu, 29 May 2008 14:27:10 GMT" } ]
2014-11-18T00:00:00
[ [ "Skvortsov", "E. D.", "" ] ]
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801.2269
Paolo Saracco
P. Saracco, M. Longhetti, S. Andreon, A. Mignano (INAF - Osservatorio Astronomico di Brera)
The evolution of the morphological scale of early-type galaxies since z=2
4 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.B122:1301-1305,2007
10.1393/ncb/i2008-10478-9
null
astro-ph
null
We present the morphological analysis based on HST-NICMOS observations in the F160W filter of a sample of 30 early-type galaxies spectroscopically confirmed at 1.2<z<2. We derive the effective radius R_e and the mean surface brightness mu_e of galaxies in the rest-frame R-band. We find that early-types at z~1.5 are characterized by a surface brightness (SB) much higher then their local counterparts with comparable R_e. In particular, we find that the mean SB of these early-types should get fainter by ~2.5 mag from z~1.5 to z=0 to match the SB of the local early-types with comparable R_e. This evolution exceeds by a factor two the luminosity evolution expected for early-types in this redshift range and more than a factor three the one derived from the observed luminosity function of galaxies. Consequently, an evolution of the effective radius R_e from the epoch of their formation towards z=0 has to be invoked and the hypothesis of fixed size rejected.
[ { "version": "v1", "created": "Tue, 15 Jan 2008 12:31:55 GMT" } ]
2010-11-11T00:00:00
[ [ "Saracco", "P.", "", "INAF - Osservatorio\n Astronomico di Brera" ], [ "Longhetti", "M.", "", "INAF - Osservatorio\n Astronomico di Brera" ], [ "Andreon", "S.", "", "INAF - Osservatorio\n Astronomico di Brera" ], [ "Mignano", "A.", "", "INAF - Osservatorio\n Astronomico di Brera" ] ]
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801.227
Ferdinando Patat
F. Patat
The Dancing Sky: 6 years of night sky observations at Cerro Paranal
19 pages, 27 figures, accepted for publication in Astronomy & Astrophysics. Full resolution version at http://www.hq.eso.org/~fpatat/science/skybright/paperIII.pdf
null
10.1051/0004-6361:20079279
null
astro-ph
null
The present work provides the results of the first six years of operation of the systematic night-sky monitoring at ESO-Paranal (Chile). The UBVRI night-sky brightness was estimated on about 10,000 VLT-FORS1 archival images, obtained on more than 650 separate nights, distributed over 6 years and covering the descent from maximum to minimum of sunspot cycle n.23. Additionally, a set of about 1,000 low resolution, optical night-sky spectra have been extracted and analyzed. The unprecedented database discussed in this paper has led to the detection of a clear seasonal variation of the broad band night sky brightness in the VRI passbands, similar to the well known semi-annual oscillation of the NaI D doublet. The spectroscopic data demonstrate that this seasonality is common to all spectral features, with the remarkable exception of the OH rotational-vibrational bands. A clear dependency on the solar activity is detected in all passbands and it is particularly pronounced in the U band, where the sky brightness decreased by about 0.6 mag arcsec-2 from maximum to minimum of solar cycle n.23. No correlation is found between solar activity and the intensity of the NaI D doublet and the OH bands. A strong correlation between the intensity of NI 5200A and [OI]6300,6364A is reported here for the first time. The paper addresses also the determination of the correlation timescales with solar activity and the possible connection with the flux of charged particles emitted by the Sun.
[ { "version": "v1", "created": "Tue, 15 Jan 2008 11:58:14 GMT" } ]
2009-11-13T00:00:00
[ [ "Patat", "F.", "" ] ]
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801.2271
Iraklis S. Konstantopoulos
I. S. Konstantopoulos (1), N. Bastian (1), L. J. Smith (2,1), G. Trancho (3,4), M. S. Westmoquette (1), J. S. Gallagher III (5) ((1) University College London, (2) STScI and ESA, (3) Universidad de La Laguna, (4) Gemini Observatory, (5) University of Wisconsin-Madison)
New Results on the Ages of Star Clusters in Region B of M82
To appear in Perez, de Grijs and Gonzalez Delgado (eds.), `Young Massive Star Clusters: Initial Conditions and Environments', 2008, Astrophysics & Space Science
Astrophys.Space Sci.324:343-346,2009
10.1007/s10509-009-0092-9
null
astro-ph
null
The post-starburst region B in M82 and its massive star cluster component have been the focus of multiple studies, with reports that there is a large population of coeval clusters of age ~1 Gyr, which were created with a Gaussian initial mass distribution. This is in disagreement with other studies of young star clusters, which invariably find a featureless power-law mass distribution. Here, we present Gemini-North optical spectra of seven star clusters in M82-B and show that their ages are all between 10 and 300 Myr (a factor of 3-100 younger than previous photometric results) and that their extinctions range between near-zero and 4 mag (Av). Using new HST ACS-HRC U-band observations we age date an additional ~30 clusters whose ages/extinctions agree well with those determined from spectroscopy. Completeness tests show that the reported `turn-over' in the luminosity/mass distributions is most likely an artefact, due to the resolved nature of the clusters. We also show that the radial velocities of the clusters are inconsistent with them belonging to a bound region.
[ { "version": "v1", "created": "Tue, 15 Jan 2008 12:02:22 GMT" } ]
2009-12-04T00:00:00
[ [ "Konstantopoulos", "I. S.", "" ], [ "Bastian", "N.", "" ], [ "Smith", "L. J.", "" ], [ "Trancho", "G.", "" ], [ "Westmoquette", "M. S.", "" ], [ "Gallagher", "J. S.", "III" ] ]
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801.2272
Henri Johnston
Cornelius Greither and Henri Johnston
Non-existence and splitting theorems for normal integral bases
17 pages, 4 figures, uses xypic, minor revisions following referee's report. To appear in Annales de L'Institut Fourier
null
null
null
math.NT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We establish new conditions that prevent the existence of (weak) normal integral bases in tame Galois extensions of number fields. This leads to the following result: under appropriate technical hypotheses, the existence of a normal integral basis in the upper layer of an abelian tower Q \subset K \subset L forces the tower to be split in a very strong sense.
[ { "version": "v1", "created": "Tue, 15 Jan 2008 12:16:00 GMT" }, { "version": "v2", "created": "Thu, 26 Feb 2009 12:38:19 GMT" } ]
2009-02-26T00:00:00
[ [ "Greither", "Cornelius", "" ], [ "Johnston", "Henri", "" ] ]
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