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711.3108
Matthias Bergner
Matthias Bergner, Jens Dittrich
A Uniqueness and Periodicity Result for Solutions of Elliptic Equations in Unbounded Domains
null
null
null
null
math.AP
null
We proof a uniqueness and periodicity theorem for bounded solutions of uniformly elliptic equations in certain unbounded domains.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 10:41:06 GMT" } ]
2007-11-21T00:00:00
[ [ "Bergner", "Matthias", "" ], [ "Dittrich", "Jens", "" ] ]
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711.3109
Klaus Hornberger
Klaus Hornberger, Bassano Vacchini
Monitoring derivation of the quantum linear Boltzmann equation
published version, 20 pages, 2 figures; now in fancy two-column format
Phys. Rev. A 77, 022112 (2008)
10.1103/PhysRevA.77.022112
null
quant-ph math-ph math.MP
null
We show how the effective equation of motion for a distinguished quantum particle in an ideal gas environment can be obtained by means of the monitoring approach introduced in [EPL 77, 50007 (2007)]. The resulting Lindblad master equation accounts for the quantum effects of the scattering dynamics in a non-perturbative fashion and it describes decoherence and dissipation in a unified framework. It incorporates various established equations as limiting cases and reduces to the classical linear Boltzmann equation once the state is diagonal in momentum.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 10:42:54 GMT" }, { "version": "v2", "created": "Thu, 21 Feb 2008 19:17:40 GMT" } ]
2009-06-09T00:00:00
[ [ "Hornberger", "Klaus", "" ], [ "Vacchini", "Bassano", "" ] ]
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711.311
Llu\'is Bel
Ll. Bel
Covariance and meaning
10 pages, Corrected typos, Changed example
null
null
null
gr-qc
null
Several other factors, besides the intrinsic local geometry, contribute to give a meaning to a space-time model. The simplest example comes from comparing Minkowski's and Milne's model, that both have a null Riemann tensor. We add to these two models a third one which describes a time-dependent locally-Minkowskian spherically symmetric space-time on which every test-particle at rest with respect to the center of symmetry sustains a constant force. Although the model is globally grossly un-realistic we think that it can be helpful to describe a local perturbation of an homogeneous cosmological model. Or as a substitute to the very far away asymptotic Minkowskian behavior usually assumed to describe the gravitational field of compact spherical bodies.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 10:47:02 GMT" }, { "version": "v2", "created": "Wed, 5 Dec 2007 10:56:49 GMT" } ]
2007-12-05T00:00:00
[ [ "Bel", "Ll.", "" ] ]
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711.3111
Feng-Li Lin
I-Ching Yu, Feng-Li Lin and Ching-Yu Huang
Quantum Secret Sharing with Multi-level Mutually (Un-)Biased Bases
5 pages, v2 typos corrected, v3 content improved, v4 propose a new protocol against entanglement-assisted participant's attack
null
10.1103/PhysRevA.78.012344
null
quant-ph hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We construct general schemes for multi-partite quantum secret sharing using multi-level systems, and find that the consistent conditions for valid measurements can be summarized in two simple algebraic conditions. The scheme using the very high dimensional mutually unbiased bases can in principle achieve perfect security against intercept-resend attack; and for the scheme using mutually biased bases, it reaches the optimal but non-perfect security at 4-level system. We also address the security issue against the general attacks in the context of our multi-level schemes. Especially, we propose new protocol to enhance both the efficiency and the security against the entanglement-assisted participant's attack by incorporating quantum-key-distribution and measurement-basis-encrypted schemes so that its security is as robust as quantum-key-distribution.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 10:49:53 GMT" }, { "version": "v2", "created": "Tue, 27 Nov 2007 15:05:23 GMT" }, { "version": "v3", "created": "Fri, 28 Dec 2007 07:16:50 GMT" }, { "version": "v4", "created": "Tue, 10 Jun 2008 05:59:27 GMT" } ]
2015-07-22T00:00:00
[ [ "Yu", "I-Ching", "" ], [ "Lin", "Feng-Li", "" ], [ "Huang", "Ching-Yu", "" ] ]
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711.3112
Michal \v{S}vanda
Th. Roudier (1), M. Svanda (2 and 3), N. Meunier (1 and 4), S. Keil (5), M. Rieutord (1), J.M. Malherbe (6), S. Rondi (1), G. Molodij (6), V. Bommier (7), B. Schmieder (6) ((1) Laboratoire d'Astrophysique de l'Observatoire Midi-Pyrenees, Tarbes, France (2) Astronomical Institute of Academy of Sciences, v.v.i., Ondrejov, Czech Republic (3) Astronomical Institute of Charles University, Prague, Czech Republic (4) Laboratoire d'Astrophysique, Observatoire de Grenoble, France (5) National Solar Observatory, Sacramento Peak, USA (6) LESIA, Observatoire de Paris, France (7) LERMA, Observatoire de Paris, France)
Large-scale horizontal flows in the solar photosphere III: Effects on filament destabilization
9 pages, 10 figures, accepted in A&A
null
10.1051/0004-6361:20077973
null
astro-ph
null
We study the influence of large-scale photospheric motions on the estabilization of an eruptive filament, observed on October 6, 7, and 8, 2004, as part of an international observing campaign (JOP 178). Large-scale horizontal flows were invetigated from a series of MDI full-disc Dopplergrams and magnetograms. From the Dopplergrams, we tracked supergranular flow patterns using the local correlation tracking (LCT) technique. We used both LCT and manual tracking of isolated magnetic elements to obtain horizontal velocities from magnetograms. We find that the measured flow fields obtained by the different methods are well-correlated on large scales. The topology of the flow field changed significantly during the filament eruptive phase, suggesting a possible coupling between the surface flow field and the coronal magnetic field. We measured an increase in the shear below the point where the eruption starts and a decrease in shear after the eruption. We find a pattern in the large-scale horizontal flows at the solar surface that interact with differential rotation. We conclude that there is probably a link between changes in surface flow and the disappearance of the eruptive filament.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 11:02:57 GMT" } ]
2009-11-13T00:00:00
[ [ "Roudier", "Th.", "", "2 and 3" ], [ "Svanda", "M.", "", "2 and 3" ], [ "Meunier", "N.", "", "1 and 4" ], [ "Keil", "S.", "" ], [ "Rieutord", "M.", "" ], [ "Malherbe", "J. M.", "" ], [ "Rondi", "S.", "" ], [ "Molodij", "G.", "" ], [ "Bommier", "V.", "" ], [ "Schmieder", "B.", "" ] ]
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711.3113
Yuri Kornyushin
Yuri Kornyushin
Screening and impurity ionization energy in semiconductors
Microscopic electrostatic field around ions is taken into account
null
null
null
cond-mat.mtrl-sci
null
Usually microscopic electrostatic field around charged impurity ions is neglected when the ionization energy is concerned. The ionization energy is considered to be equal to that of a lonely impurity atom. Here the energy of the electrostatic field around charged impurity ions in semiconductor is taken into account. It is shown that the energy of this field contributes to decrease in the effective ionization energy. At high enough current carriers concentration the effective ionization energy becomes zero.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 11:00:16 GMT" }, { "version": "v2", "created": "Sun, 25 Nov 2007 07:44:40 GMT" }, { "version": "v3", "created": "Tue, 4 Dec 2007 05:51:57 GMT" } ]
2007-12-04T00:00:00
[ [ "Kornyushin", "Yuri", "" ] ]
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711.3114
Alfredo Valcarce
A. Valcarce, J. Vijande, N. Barnea
Charm Physics: Hints for a Mature Description of Hadrons
Talk given at HADRON '07, Frascati, Italy, October 2007
Frascati Physics Series XLVI, 945-952 (2007)
null
null
hep-ph
null
The physics of charm has become one of the best laboratories exposing the limitations of the naive constituent quark model and also giving hints into a more mature description of hadron spectroscopy. Recent discoveries are a challenge that have revolutionized our understanding of the hadron spectra. In this talk we address the study of many-quark components in charmonium spectra. To make the physics clear we also discuss exotic many-quark systems.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 11:07:55 GMT" } ]
2008-07-30T00:00:00
[ [ "Valcarce", "A.", "" ], [ "Vijande", "J.", "" ], [ "Barnea", "N.", "" ] ]
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711.3115
Andres Santos
Andres Santos
Does the Chapman--Enskog expansion for sheared granular gases converge?
4 pages, 1 table, 2 figures; v2: minor changes,Fig. 2 redone
Phys. Rev. Lett. 100, 078003 (2008)
10.1103/PhysRevLett.100.078003
null
cond-mat.soft cond-mat.stat-mech
null
The fundamental question addressed in this paper is whether the partial Chapman--Enskog expansion $P_{xy}=-\sum_{k=0}^\infty \eta_k ({\partial u_x}/{\partial y})^{2k+1}$ of the shear stress converges or not for a gas of inelastic hard spheres. By using a simple kinetic model it is shown that, in contrast to the elastic case, the above series does converge, the radius of convergence increasing with inelasticity. It is argued that this paradoxical conclusion is not an artifact of the kinetic model and can be understood in terms of the time evolution of the scaled shear rate in the uniform shear flow.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 11:08:32 GMT" }, { "version": "v2", "created": "Thu, 21 Feb 2008 18:06:50 GMT" } ]
2008-02-21T00:00:00
[ [ "Santos", "Andres", "" ] ]
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711.3116
Adolfo del Campo
S. V. Mousavi, A. del Campo, I. Lizuain, M. Pons, J. G. Muga
Seeking better times: atomic clocks in the generalized Tonks-Girardeau regime
Revised manuscript, 8 pages, 8 figures, proceedings of the 395th WE-Heraeus Seminar on "Time Dependent Phenomena in Quantum Mechanics ", Blaubeuren, Germany, September 2007
J. Phys.: Conf. Ser. 99, 012014 (2008)
10.1088/1742-6596/99/1/012014
null
quant-ph cond-mat.quant-gas
null
This article is based on the talk with the same title at the Blaubeuren meeting. First we discuss briefly the importance of time and time keeping, explaining the basic functioning of clocks in general and atomic clocks in particular, which rely on Ramsey interferometry. The usefulness of cold atoms is discussed as well as their limits in Bose-Einstein condensates. An alternative that we study is a different cold-atom regime: the Tonks-Girardeau (TG) gas of tightly confined and strongly interacting bosons. The TG gas is reviewed and then generalized for two-level atoms. Finally, we explore the combination of Ramsey interferometry and TG gases.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 11:11:13 GMT" }, { "version": "v2", "created": "Mon, 14 Jan 2008 10:03:32 GMT" } ]
2010-12-10T00:00:00
[ [ "Mousavi", "S. V.", "" ], [ "del Campo", "A.", "" ], [ "Lizuain", "I.", "" ], [ "Pons", "M.", "" ], [ "Muga", "J. G.", "" ] ]
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711.3117
Mark Harmer Dr
M. Harmer
Two particles on a star graph II
typos corrected, minor changes, journal ref added
Russian Journal of Mathematical Physics, 15 (2008), 473--480
10.1134/S1061920808040043
null
math-ph math.MP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider a two particle system on a star graph with delta-function interaction. A complete description of the eigensolutions with real momenta is given; specifically it is shown that all eigensolutions can be written as integrals in the momentum plane of sums of products of appropriate one particle solutions.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 11:40:07 GMT" }, { "version": "v2", "created": "Mon, 8 Dec 2008 00:33:14 GMT" } ]
2009-11-13T00:00:00
[ [ "Harmer", "M.", "" ] ]
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711.3118
Javier Vijande Asenjo
J. Vijande, E. Weissman, A. Valcarce, N. Barnea
On the existence of exotic and non-exotic multiquark meson states
3 pages. Contribution to the 20th European Conference on Few-Body Problems in Physics, Pisa, Italy. To be published in Few-Body systems
Few Body Syst.44:99-101,2008
10.1007/s00601-008-0266-y
null
hep-ph hep-ex
null
To obtain an exact solution of a four-body system containing two quarks and two antiquarks interacting through two-body terms is a cumbersome task that has been tackled with more or less success during the last decades. We present an exact method for the study of four-quark systems based on the hyperspherical harmonics formalism that allows us to solve it without resorting to further approximations, like for instance the existence of diquark components. We apply it to systems containing two heavy and two light quarks using different quark-quark potentials. While $QQ\bar n \bar n$ states may be stable in nature, the stability of $Q\bar Qn \bar n$ states would imply the existence of quark correlations not taken into account by simple quark dynamical models.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 12:07:34 GMT" } ]
2009-09-29T00:00:00
[ [ "Vijande", "J.", "" ], [ "Weissman", "E.", "" ], [ "Valcarce", "A.", "" ], [ "Barnea", "N.", "" ] ]
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711.3119
Alexei Nefediev
A.V.Nefediev (ITEP, Moscow)
Chiral symmetry breaking and Lorentz nature of confinement
4 pages, no figures, specialized style files included. Talk given at 13th Lomonosov Conference on Elementary Particle Physics, Moscow, Russia, 23-29 August 2007, to appear in Proceedings
null
null
null
hep-ph
null
The Lorentz nature of confinement in a heavy-light quarkonium is investigated. It is demonstrated that an effective scalar interaction is generated selfconsistently as a result of chiral symmetry breaking, and this effective scalar interaction is responsible for the QCD string formation between the quark and the antiquark.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 11:46:35 GMT" } ]
2007-11-21T00:00:00
[ [ "Nefediev", "A. V.", "", "ITEP, Moscow" ] ]
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711.312
Anna Scaife
A. M. M. Scaife, N. Hurley-Walker, M. L. Davies, P. J. Duffett-Smith, F. Feroz, K. J. B. Grainge, D. A. Green, M. P. Hobson, T. Kaneko, A. N. Lasenby, G. G. Pooley, R. D. E. Saunders, P. F. Scott, D. J. Titterington, E. M. Waldram, J. Zwart
AMI limits on 15 GHz excess emission in northern HII regions
accepted MNRAS
null
10.1111/j.1365-2966.2007.12743.x
null
astro-ph
null
We present observations between 14.2 and 17.9 GHz of sixteen Galactic HII regions made with the Arcminute Microkelvin Imager (AMI). In conjunction with data from the literature at lower radio frequencies we investigate the possibility of a spinning dust component in the spectra of these objects. We conclude that there is no significant evidence for spinning dust towards these sources and measure an average spectral index of 0.15+/-0.07 between 1.4 and 17.9 GHz for the sample.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 11:56:35 GMT" } ]
2009-11-13T00:00:00
[ [ "Scaife", "A. M. M.", "" ], [ "Hurley-Walker", "N.", "" ], [ "Davies", "M. L.", "" ], [ "Duffett-Smith", "P. J.", "" ], [ "Feroz", "F.", "" ], [ "Grainge", "K. J. B.", "" ], [ "Green", "D. A.", "" ], [ "Hobson", "M. P.", "" ], [ "Kaneko", "T.", "" ], [ "Lasenby", "A. N.", "" ], [ "Pooley", "G. G.", "" ], [ "Saunders", "R. D. E.", "" ], [ "Scott", "P. F.", "" ], [ "Titterington", "D. J.", "" ], [ "Waldram", "E. M.", "" ], [ "Zwart", "J.", "" ] ]
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711.3121
Gregor Tanner
Gregor Tanner, Nark Nyul Choi, Min-Ho Lee, Achim Czasch, Reinhard Doerner
Evidence of triple collision dynamics in partial photo-ionisation cross sections of helium
null
J Phys B 40 (2007) F157-F165
10.1088/0953-4075/40/8/F01
null
physics.atom-ph
null
Experimental results on partial photo-ionisation cross sections of helium are analysed in the light of recent advances in the semiclassical theory of two-electron atoms. Byun et al (arXiv:physics/0701086) predict that the total photo-ionisation cross section below the double-ionisation threshold can, semiclassically, be described in terms of contributions associated with classical orbits starting and ending in the triple collision. The necessary modifications of the semiclassical theory for partial cross sections is developed here. It is argued that partial cross sections are also dominated by the triple collision dynamics. The expected semiclassical contributions can be identified in the Fourier transformation of the experimental data. This clearly demonstrates for the first time the validity of the basic assumptions made in Byun et al. Our findings explain furthermore in a natural way the self-similar structures observed in cross section signals for different channel numbers.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 12:07:01 GMT" } ]
2009-11-13T00:00:00
[ [ "Tanner", "Gregor", "" ], [ "Choi", "Nark Nyul", "" ], [ "Lee", "Min-Ho", "" ], [ "Czasch", "Achim", "" ], [ "Doerner", "Reinhard", "" ] ]
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711.3122
Kim Siyeon
Ggyoung-Riun Hwang and Kim Siyeon
Conflict between the identification of cosmic neutrino source and the sensitivity to mixing angles in neutrino telescope
17 pages with 7 figures, published version
Phys.Rev.D78:093008,2008
10.1103/PhysRevD.78.093008
null
hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Neutrino fluxes at telescopes depend on both initial fluxes out of astronomical bursts and flavor mixing during their travel to the earth. However, since the information on the initial composition requires better precision in mixing angles and vice versa, the neutrino detection at telescopes for itself cannot provide solutions to the both problems. Thus, a probability to be measured at long baseline oscillation is considered as a complement to the telescope, and problems like source identification and parameter degeneracy are examined under a few assumptions.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 12:03:03 GMT" }, { "version": "v2", "created": "Wed, 6 Aug 2008 07:11:27 GMT" }, { "version": "v3", "created": "Wed, 10 Dec 2008 14:26:31 GMT" } ]
2009-03-04T00:00:00
[ [ "Hwang", "Ggyoung-Riun", "" ], [ "Siyeon", "Kim", "" ] ]
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711.3123
Alfredo Valcarce
H. Garcilazo, A. Valcarce
$nd$ scattering lengths from a quark-model based $NN$ interaction
6 pages, 2 tables. Accepted for publication in Physical Review C
Phys.Rev.C76:057002,2007
10.1103/PhysRevC.76.057002
null
nucl-th
null
We calculate the doublet and quartet neutron-deuteron scattering lengths using a nonlocal nucleon-nucleon interaction fully derived from quark-quark interactions. We use as input the $NN$ $^1S_0$ and $^3S_1$-${}^3 D_1$ partial waves. Our result for the quartet scattering length agrees well with the experimental value while the result for the doublet scattering length does not. However, if we take the result for the doublet scattering length together with the one for the triton binding energy they agree well with the so-called Phillips line.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 12:07:50 GMT" } ]
2011-11-10T00:00:00
[ [ "Garcilazo", "H.", "" ], [ "Valcarce", "A.", "" ] ]
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711.3124
Achilles D. Speliotopoulos
A. D. Speliotopoulos
Dark Energy and Structure Formation: Connecting the Galactic and Cosmological Length Scales
43 pages and one figure. References updated and corrected; typos corrected; and wording slightly changed. The value of \Omega_{asymp} is corrected to 0.197 from 0.196, and \Omega_{Dyn} is corrected to 0.041 from 0.042. Version submitted for publication
null
null
null
astro-ph
null
On the cosmological length scale, recent measurements by WMAP have validated $\Lambda$CDM to a precision not see before in cosmology. Such is not the case on galactic length scales, however, where the `cuspy-core' problem has demonstrated our lack of understanding of structure formation. Here, we propose a solution to the 'cuspy-core' problem based on the observation that with the discovery of Dark Energy, $\Lambda_{DE}$, there is now a universal length scale, $\lambda_{DE}=c/(\Lambda_{DE} G)^{1/2}$, associated with the universe. This length scale allows for an extension of the geodesic equations of motion that affects only the motion of massive test particles; the motion of massless test particles are not affected, and such phenomenon as gravitational lensing remain unchanged. An evolution equation for the density profile is derived, and an effective free energy density functional for it is constructed. We conjecture that the pseudoisothermal profile is preferred over the cusp-like profile because it has a lower effective free energy. A cosmological check of the theory is made using the observed rotational velocities and core sizes of 1393 spiral galaxies. We calculate $\sigma_8$ to be $0.68_{\pm0.11}$; this is within experimental error of the WMAP value $0.761_{-0.048}^{+0.049}$. We then calculate $R_{200}=270_{\pm 130}$ kpc, which is in agreement with observations. We estimate the fractional density of matter that cannot be determined through gravity to be $0.197_{\pm 0.017}$; this is nearly equal to the WMAP value for the fractional density of nonbaryonic matter $0.196^{+0.025}_{-0.026}$. The fractional density of matter that can be determined through gravity is then calculated to be $0.041_{-0.031}^{+0.030}$; this is nearly equal to $\Omega_B=0.0416_{-0.0039}^{+0.0038}$.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 18:09:10 GMT" }, { "version": "v2", "created": "Tue, 4 Dec 2007 23:45:13 GMT" } ]
2007-12-05T00:00:00
[ [ "Speliotopoulos", "A. D.", "" ] ]
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711.3125
Silja Pohjolainen
N.J. Lehtinen, S. Pohjolainen, K. Huttunen-Heikinmaa, E. Valtonen, R. Vainio, A.E. Hillaris
Sources of SEP Acceleration during a Flare-CME Event
Solar Physics, November 2007, in press
Solar Physics, Vol. 247, 2008, p. 151-169
10.1007/s11207-007-9093-4
null
astro-ph
null
A high-speed halo-type coronal mass ejection (CME), associated with a GOES M4.6 soft X-ray flare in NOAA AR 0180 at S12W29 and an EIT wave and dimming, occurred on 9 November 2002. A complex radio event was observed during the same period. It included narrow-band fluctuations and frequency-drifting features in the metric wavelength range, type III burst groups at metric--hectometric wavelengths, and an interplanetary type II radio burst, which was visible in the dynamic radio spectrum below 14 MHz. To study the association of the recorded solar energetic particle (SEP) populations with the propagating CME and flaring, we perform a multi-wavelength analysis using radio spectral and imaging observations combined with white-light, EUV, hard X-ray, and magnetogram data. Velocity dispersion analysis of the particle distributions (SOHO and Wind in situ observations) provides estimates for the release times of electrons and protons. Our analysis indicates that proton acceleration was delayed compared to the electrons. The dynamics of the interplanetary type II burst identify the burst source as a bow shock created by the fast CME. The type III burst groups, with start times close to the estimated electron release times, trace electron beams travelling along open field lines into the interplanetary space. The type III bursts seem to encounter a steep density gradient as they overtake the type II shock front, resulting in an abrupt change in the frequency drift rate of the type III burst emission. Our study presents evidence in support of a scenario in which electrons are accelerated low in the corona behind the CME shock front, while protons are accelerated later, possibly at the CME bow shock high in the corona.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 12:21:10 GMT" } ]
2008-01-21T00:00:00
[ [ "Lehtinen", "N. J.", "" ], [ "Pohjolainen", "S.", "" ], [ "Huttunen-Heikinmaa", "K.", "" ], [ "Valtonen", "E.", "" ], [ "Vainio", "R.", "" ], [ "Hillaris", "A. E.", "" ] ]
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711.3126
Francesco Giacosa
Francesco Giacosa
Light scalars as tetraquarks: decays and mixing with quarkonia
Talk given at the International School of Nuclear Physics, 29th Course, 'Quarks in Hadrons and Nuclei', Erice-Sicily, 16-24 September 2007. To appear in Prog. Part. Nucl. Phys. 10 pages, 1 figure
Prog.Part.Nucl.Phys.61:133-139,2008
10.1016/j.ppnp.2007.12.004
null
hep-ph
null
The tetraquark assignement for light scalar states below 1 GeV is discussed on the light of strong decays. The next-to-leading order in the large-N expansion for the strong decays is considered. Mixing with quarkonia states above 1 GeV is investigated within a chiral approach and the inclusion of finite-width effects is taken into account.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 12:51:38 GMT" }, { "version": "v2", "created": "Sun, 25 Nov 2007 16:45:31 GMT" } ]
2008-11-26T00:00:00
[ [ "Giacosa", "Francesco", "" ] ]
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711.3127
J.-L. Barrat
Michel Tsamados (LPMCN), Anne Tanguy (LPMCN), Fabien Leonforte (LPMCN), J.-L. Barrat (LPMCN)
On the study of local stress rearrangements during quasistatic plastic shear of a model glass: do local stress components contain enough information?
null
null
10.1140/epje/i2007-10324-y
null
cond-mat.mtrl-sci
null
We present a numerical study of the mechanical response of a 2D Lennard-Jones amorphous solid under steady quasistatic and athermal shear. We focus here on the evolution of local stress components. While the local stress is usually taken as an order parameter in the description of the rheological behaviour of complex fluids, and for plasticity in glasses, we show here that the knowledge of local stresses is not sufficient for a complete description of the plastic behaviour of our system. The distribution of local stresses can be approximately described as resulting from the sum of localized quadrupolar events with an exponential distribution of amplitudes. However, we show that the position of the center of the quadrupoles is not related to any special evolution of the local stress, but must be described by another variable.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 12:30:32 GMT" } ]
2009-11-13T00:00:00
[ [ "Tsamados", "Michel", "", "LPMCN" ], [ "Tanguy", "Anne", "", "LPMCN" ], [ "Leonforte", "Fabien", "", "LPMCN" ], [ "Barrat", "J. -L.", "", "LPMCN" ] ]
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711.3128
Anne-Marie Vercoustre
Anne-Marie Vercoustre (INRIA Rocquencourt / INRIA Sophia Antipolis), James A. Thom (RMIT), Jovan Pehcevski (INRIA Rocquencourt / INRIA Sophia Antipolis)
Entity Ranking in Wikipedia
to appear
Dans the 23rd Annual ACM Symposium on Applied Computing (2008)
null
null
cs.IR
null
The traditional entity extraction problem lies in the ability of extracting named entities from plain text using natural language processing techniques and intensive training from large document collections. Examples of named entities include organisations, people, locations, or dates. There are many research activities involving named entities; we are interested in entity ranking in the field of information retrieval. In this paper, we describe our approach to identifying and ranking entities from the INEX Wikipedia document collection. Wikipedia offers a number of interesting features for entity identification and ranking that we first introduce. We then describe the principles and the architecture of our entity ranking system, and introduce our methodology for evaluation. Our preliminary results show that the use of categories and the link structure of Wikipedia, together with entity examples, can significantly improve retrieval effectiveness.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 12:40:23 GMT" } ]
2007-11-21T00:00:00
[ [ "Vercoustre", "Anne-Marie", "", "INRIA Rocquencourt / INRIA Sophia Antipolis" ], [ "Thom", "James A.", "", "RMIT" ], [ "Pehcevski", "Jovan", "", "INRIA Rocquencourt / INRIA Sophia\n Antipolis" ] ]
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711.3129
Bjoern Malte Schaefer
Bjoern Malte Schaefer (ICG/Portsmouth), Kazuya Koyama (ICG/Portsmouth)
Spherical collapse in modified gravity with the Birkhoff-theorem
12 pages, 12 figures, 3 tables, submitted to MNRAS
MNRAS 385, 411-422 (2008)
10.1111/j.1365-2966.2008.12841.x
null
astro-ph
null
We study structure formation in a phenomenological model of modified gravity which interpolates between LambdaCDM and phenomenological DGP-gravity. Generalisation of spherical collapse by using the Birkhoff-theorem along with the modified growth equation shows that the overdensity for spherical collapse delta_c in these models is significantly lowered compared to LambdaCDM, leading to enhanced number densities of massive clusters and enhanced cluster merging rates. We find that delta_c(z) is well fitted by a function of the form delta_c(z) = a - b\exp(-cz). We examine the sensitivity of PLANCK's and SPT's Sunyaev-Zel'dovich survey to constrain the modified gravity parameterisation and find that these experiments can easily distinguish between models with a cosmological constant and modified gravity, if prior constraints from CMB temperature and polarisation anisotropies are included.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 12:53:11 GMT" } ]
2013-03-07T00:00:00
[ [ "Schaefer", "Bjoern Malte", "", "ICG/Portsmouth" ], [ "Koyama", "Kazuya", "", "ICG/Portsmouth" ] ]
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711.313
Koji Nagata
Koji Nagata
There is no axiomatic system for the quantum theory
Journal of Mathematical Physics, (2007), (accepted for publication)
null
null
null
physics.gen-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Recently, [arXiv:0810.3134] is accepted and published. We derive an inequality with two settings as tests for the existence of the Bloch sphere in a spin-1/2 system. The probability theory of measurement outcome within the formalism of von Neumann projective measurement violates the inequality. Namely, we have to give up the existence of the Bloch sphere. Or, we have to give up the probability theory of measurement outcome within the formalism of von Neumann projective measurement. Hence it turns out that there is a contradiction in the Hilbert space formalism of the quantum theory, viz., there is no axiomatic system for the theory.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 12:54:05 GMT" }, { "version": "v2", "created": "Wed, 5 Dec 2007 09:42:07 GMT" }, { "version": "v3", "created": "Tue, 21 Oct 2008 14:00:29 GMT" }, { "version": "v4", "created": "Fri, 28 Nov 2008 09:38:10 GMT" } ]
2008-11-28T00:00:00
[ [ "Nagata", "Koji", "" ] ]
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711.3131
Kostyantyn Ropotenko
K. Ropotenko
Kolmogorov-Sinai and Bekenstein-Hawking entropies
8 pages, no figures; factors in Eqns. (12), (21) corrected; structure of the paper improved; main results and conclusions unchanged
null
null
null
gr-qc
null
It is shown that instability of stringy matter near the event horizon of a black hole (the spreading effect) can be characterized by the Lyapunov exponents. The Kolmogorov-Sinai entropy is the sum of all the positive Lyapunov exponents and equals to the inverse gravitational radius. Due to a replacement of the configuration space of a string by its phase space at distance of order of the string scale, the relation between the Kolmogorov-Sinai and Bekenstein-Hawking entropies is established. The KS entropy of a black hole measures the rate at which information about the state of a string collapsing into the black hole is lost with time as it spreads over the horizon.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 13:07:10 GMT" }, { "version": "v2", "created": "Tue, 11 Dec 2007 08:27:09 GMT" }, { "version": "v3", "created": "Fri, 21 Dec 2007 13:37:41 GMT" } ]
2011-11-10T00:00:00
[ [ "Ropotenko", "K.", "" ] ]
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711.3132
Daniel Bloch
Marco Romanelli (LPL), Isabelle Maurin (LPL), Petko Todorov (LPL), Chia-Hua Chan, Daniel Bloch (LPL)
A 2D nanosphere array for atomic spectroscopy
accept\'e pour publication \`a Annales de Physique- proceedings of COLOQ10
null
10.1051/anphys:2008024
null
physics.atom-ph cond-mat.mes-hall
null
We are interested in the spectroscopic behaviour of a gas confined in a micrometric or even nanometric volume. Such a situation could be encountered by the filling-up of a porous medium, such as a photonic crystal, with an atomic gas. Here, we discuss the first step of this program, with the generation and characterization of a self-organized 2D film of nanospheres of silica. We show that an optical characterization by laser light diffraction permits to extract some information on the array structure and represents an interesting complement to electron microscopy.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 13:13:09 GMT" } ]
2009-11-13T00:00:00
[ [ "Romanelli", "Marco", "", "LPL" ], [ "Maurin", "Isabelle", "", "LPL" ], [ "Todorov", "Petko", "", "LPL" ], [ "Chan", "Chia-Hua", "", "LPL" ], [ "Bloch", "Daniel", "", "LPL" ] ]
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711.3133
Mercedes Molla
M. Moll\'a (1), J. M. V\'ilchez,(2), A.I. D\'iaz,(3) and M. Gavil\'an (3) ((1) CIEMAT, Departamento de Investigaci\'on B\'asica, Madrid, Spain, (2) Instituto de Astrof\'isica de Andaluc\'ia, CSIC, Granada, Spain, (3) Departamento de F\'isica Te\'orica, Universidad Aut\'onoma de Madrid, Cantoblanco, Madrid, Spain)
The role of the star formation on the nitrogen abundance evolution
2 pages, 2 figures, proceedings of the conference Pathways Through an Eclectic Universe, Eds. T.Mahoney, A. Vazdekis & J. Knapen, Tenerife 2007
null
null
null
astro-ph
null
We analyze the evolution of nitrogen resulting from a set of spiral and irregular galaxy models computed for a large number of input mass radial distributions and with various star formation efficiencies. We show that our models produce a nitrogen abundance evolution in good agreement with the observational data. Differences in the star formation histories of the regions and galaxies modeled are essential to reproduce the observational data in the N/O-O/H plane and the corresponding dispersion.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 13:27:51 GMT" } ]
2007-11-21T00:00:00
[ [ "Mollá", "M.", "" ], [ "Vílchez", "J. M.", "" ], [ "Díaz", "A. I.", "" ], [ "Gavilán", "M.", "" ] ]
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711.3134
Lise Van Proeyen
Lise Van Proeyen and Willem Veys
Poles of the topological zeta function associated to an ideal in dimension two
17 pages, to be published in Mathematische Zeitschrift
null
null
null
math.AG
null
To an ideal in $\mathbb{C}[x,y]$ one can associate a topological zeta function. This is an extension of the topological zeta function associated to one polynomial. But in this case we use a principalization of the ideal instead of an embedded resolution of the curve. In this paper we will study two questions about the poles of this zeta function. First, we will give a criterion to determine whether or not a candidate pole is a pole. It turns out that we can know this immediately by looking at the intersection diagram of the principalization, together with the numerical data of the exceptional curves. Afterwards we will completely describe the set of rational numbers that can occur as poles of a topological zeta function associated to an ideal in dimension two. The same results are valid for related zeta functions, as for instance the motivic zeta function.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 13:36:24 GMT" } ]
2007-11-21T00:00:00
[ [ "Van Proeyen", "Lise", "" ], [ "Veys", "Willem", "" ] ]
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711.3135
Henrik Jeldtoft Jensen
Alastair L. Windus and Henrik Jeldtoft Jensen
Cluster geometry and survival probability in systems driven by reaction-diffusion dynamics
4 pages, 6 figures
null
10.1088/1367-2630/10/11/113023
null
cond-mat.stat-mech
null
We consider a reaction-diffusion model incorporating the reactions A -> 0, A -> 2A and 2A -> 3A. Depending on the relative rates for sexual and asexual reproduction of the quantity A, the model exhibits either a continuous or first-order absorbing phase transition to an extinct state. A tricritical point separates the two phase lines. As well as briefly examining this critical behavior in 2+1 dimensions, we pay particular attention to the cluster geometry. We observe the different cluster structures that form at criticality for the three different types of critical behavior and show that there exists a linear relationship for the probability of survival against initial cluster size at the tricritical point only.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 13:38:05 GMT" } ]
2009-11-13T00:00:00
[ [ "Windus", "Alastair L.", "" ], [ "Jensen", "Henrik Jeldtoft", "" ] ]
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711.3136
Jeff Kahn
Jeff Kahn, Nicholas Weininger
Positive association in the fractional fuzzy Potts model
Published in at http://dx.doi.org/10.1214/009117907000000042 the Annals of Probability (http://www.imstat.org/aop/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Annals of Probability 2007, Vol. 35, No. 6, 2038-2043
10.1214/009117907000000042
IMS-AOP-AOP314
math.PR
null
A fractional fuzzy Potts measure is a probability distribution on spin configurations of a finite graph $G$ obtained in two steps: first a subgraph of $G$ is chosen according to a random cluster measure $\phi_{p,q}$, and then a spin ($\pm1$) is chosen independently for each component of the subgraph and assigned to all vertices of that component. We show that whenever $q\geq1$, such a measure is positively associated, meaning that any two increasing events are positively correlated. This generalizes earlier results of H\"{a}ggstr\"{o}m [Ann. Appl. Probab. 9 (1999) 1149--1159] and H\"{a}ggstr\"{o}m and Schramm [Stochastic Process. Appl. 96 (2001) 213--242].
[ { "version": "v1", "created": "Tue, 20 Nov 2007 13:46:59 GMT" } ]
2011-11-10T00:00:00
[ [ "Kahn", "Jeff", "" ], [ "Weininger", "Nicholas", "" ] ]
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711.3137
Peter Richardson
M. Bahr, S. Gieseke, M. Gigg, D. Grellscheid, K. Hamilton, O. Latunde-Dada, S. Platzer, P. Richardson, M. H. Seymour, A. Sherstnev and B. R. Webber
Herwig++ 2.1 Release Note
Program available at http://projects.hepforge.org/herwig/
null
null
Cavendish-HEP-07/10, CERN-PH-TH/226, CP3-07-30, IPPP/07/89, DCPT/07/178, KA-TP-30
hep-ph
null
A new release of the Monte Carlo program Herwig++ (version 2.1) is now available. This version includes a number of significant improvements including: an eikonal multiple parton-parton scattering model of the underlying event; the inclusion of Beyond the Standard Model physics; and a new hadronic decay model tuned to LEP data. This version of the program is now fully ready for the simulation of events in hadron-hadron collisions.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 15:09:18 GMT" } ]
2007-11-21T00:00:00
[ [ "Bahr", "M.", "" ], [ "Gieseke", "S.", "" ], [ "Gigg", "M.", "" ], [ "Grellscheid", "D.", "" ], [ "Hamilton", "K.", "" ], [ "Latunde-Dada", "O.", "" ], [ "Platzer", "S.", "" ], [ "Richardson", "P.", "" ], [ "Seymour", "M. H.", "" ], [ "Sherstnev", "A.", "" ], [ "Webber", "B. R.", "" ] ]
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711.3138
Christian Hoerhammer
C. Hoerhammer and H. Buettner
Non-Markovian decoherence and disentanglement scenarios in quantum Brownian motion
12 pages, 4 figures
null
null
null
quant-ph
null
We study the non-Markovian decoherence and disentanglement dynamics of dissipative quantum systems with special emphasis on non-Gaussian continuous variable systems. The dynamics are described by the Hu-Paz-Zhang master equation of quantum Brownian motion. The time evolution of the decoherence function of a single-mode superposition is compared to the concurrence of a two-mode entangled state. It is verified that moderate non-Markovian influences slow down the decay of interference fringes and quantum correlations, while strong non-Markovian effects resulting from an out-of-resonance bath can even accelerate the loss of coherence, compared to predictions of Markovian approximations. Qualitatively different scenarios including exponential, Gaussian or algebraic decay of the decoherence function are analyzed. It is shown that partial revivals of coherence can occur in case of non-Lindblad-type dynamics.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 13:56:37 GMT" } ]
2007-11-21T00:00:00
[ [ "Hoerhammer", "C.", "" ], [ "Buettner", "H.", "" ] ]
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711.3139
Edwin Salpeter Dr.
Edwin E. Salpeter
Nuclear Astrophysics Before 1957
16 pages
null
10.1071/AS07036
null
astro-ph nucl-th physics.hist-ph
null
I discuss especially my summer with Willy Fowler at Kellogg Radiation in 1951, where I did my "triple-alpha" work. I also go back even earlier to Arthur Eddington and Hans Bethe. I also mention the 1953 summer school in Ann Arbor.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 14:09:35 GMT" } ]
2009-11-13T00:00:00
[ [ "Salpeter", "Edwin E.", "" ] ]
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711.314
Kazimierz Borkowski
Kazimierz J. Borkowski, Sean P. Hendrick, and Stephen P. Reynolds
X-Ray Emitting Ejecta of Supernova Remnant N132D
5 pages, 6 figures, ApJ Letters, in press
null
10.1086/524733
null
astro-ph
null
The brightest supernova remnant in the Magellanic Clouds, N132D, belongs to the rare class of oxygen-rich remnants, about a dozen objects that show optical emission from pure heavy-element ejecta. They originate in explosions of massive stars that produce large amounts of O, although only a tiny fraction of that O is found to emit at optical wavelengths. We report the detection of substantial amounts of O at X-ray wavelengths in a recent 100 ks Chandra ACIS observation of N132D. A comparison between subarcsecond-resolution Chandra and Hubble images reveals a good match between clumpy X-ray and optically emitting ejecta on large (but not small) scales. Ejecta spectra are dominated by strong lines of He- and H-like O; they exhibit substantial spatial variations partially caused by patchy absorption within the LMC. Because optical ejecta are concentrated in a 5 pc radius elliptical expanding shell, the detected ejecta X-ray emission also originates in this shell.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 14:15:16 GMT" } ]
2009-11-13T00:00:00
[ [ "Borkowski", "Kazimierz J.", "" ], [ "Hendrick", "Sean P.", "" ], [ "Reynolds", "Stephen P.", "" ] ]
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711.3141
Mercedes Molla
M. Moll\'a,(1) M.L. Garc\'ia-Vargas,(2), Alessandro Bressan,(3) and Pedro G\'omez-Alvarez (4), ((1) Depto. de Investigacion Basica, CIEMAT, Madrid, Spain, (2)FRACTAL, Las Rozas de Madrid, Spain, (3) INAF Osservatorio Astronomico di Padova, Padova, Italy, (4)ESAC, Villafranca del Castillo, Madrid Spain)
A new grid of evolutionary synthesis models
2 pages, 1 figure, proceedings of the conference Pathways Through an Eclectic Universe, Eds. T.Mahoney, A. Vazdekis & J. Knapen, Tenerife 2007
null
null
null
astro-ph
null
We present new evolutionary synthesis models for Single Stellar Populations covering a wide range in age and metallicity. The most important difference with existing models is the use of NLTE atmosphere models for the hot stars (O, B, WR, post-AGB stars, and planetary nebulae) that have an important impact in the stellar cluster's ionizing spectra.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 14:19:18 GMT" } ]
2007-11-21T00:00:00
[ [ "Mollá", "M.", "" ], [ "García-Vargas", "M. L.", "" ], [ "Bressan", "Alessandro", "" ], [ "Gómez-Alvarez", "Pedro", "" ] ]
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711.3142
Fernando Fantino
Fernando Fantino
On pointed Hopf algebras associated with the Mathieu simple groups
41 pages. Abstract and Theorem 1 (Table 1) modified; Subsection 1.3 added; Sections 2-6 (in version 1) put together in a Section 2 (in new version); Section 3 added. References: [AS1] removed, [AF3], [AFGV], [AHS] added. Cite in Theorem 1.2 corrected; Lemmata 1.4 and 1.5 (of v1) put together in Lemma 1.4 (of nv); Lemma 1.5 (of nv) briefly modified
J. Algebra Appl., Vol 8, No. 5 (2009), Pages 633-672
null
null
math.QA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Let G be a Mathieu simple group, s in G, O_s the conjugacy class of s and \rho an irreducible representation of the centralizer of s. We prove that either the Nichols algebra B(O_s,\rho) is infinite-dimensional or the braiding of the Yetter-Drinfeld module M(O_s, \rho) is negative. We also show that if G=M22 or M24, then the group algebra of G is the only (up to isomorphisms) finite-dimensional complex pointed Hopf algebra with group-likes isomorphic to G.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 14:19:59 GMT" }, { "version": "v2", "created": "Sat, 26 Jul 2008 16:07:06 GMT" } ]
2010-07-01T00:00:00
[ [ "Fantino", "Fernando", "" ] ]
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711.3143
Jan Michael Friedrich
Suh-Urk Chung and Jan Friedrich
Covariant Helicity-Coupling Amplitudes: A New Formulation
null
Phys.Rev.D78:074027,2008
10.1103/PhysRevD.78.074027
null
hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We have worked out covariant amplitudes for any two-body decay of a resonance with an arbitrary non-zero mass, which involves arbitrary integer spins in the initial and the final states. One key new ingredient for this work is the application of the total intrinsic spin operator $\vec S$ which is given directly in terms of the generators of the Poincar\'e group. Using the results of this study, we show how to explore the Lorentz factors which appear naturally, if the momentum-space wave functions are used to form the covariant decay amplitudes. We have devised a method of constructing our covariant decay amplitudes, such that they lead to the Zemach amplitudes when the Lorentz factors are set one.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 14:21:44 GMT" }, { "version": "v2", "created": "Wed, 5 Mar 2008 20:34:36 GMT" }, { "version": "v3", "created": "Thu, 29 May 2008 21:41:04 GMT" }, { "version": "v4", "created": "Mon, 4 Aug 2008 21:13:14 GMT" } ]
2008-11-26T00:00:00
[ [ "Chung", "Suh-Urk", "" ], [ "Friedrich", "Jan", "" ] ]
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711.3144
Gareth Murphy
G.C. Murphy, T. Lery, S. O'Sullivan, D. Spicer, F. Bacciotti, and A. Rosen
Interacting Jets from Binary Protostars
accepted for publication in A&A
Astron.Astrophys.478:453-460,2008
10.1051/0004-6361:20078609
null
astro-ph
null
We investigate potential models that could explain why multiple proto-stellar systems predominantly show single jets. During their formation, stars most frequently produce energetic outflows and jets. However, binary jets have only been observed in a very small number of systems. We model numerically 3D binary jets for various outflow parameters. We also model the propagation of jets from a specific source, namely L1551 IRS 5, known to have two jets, using recent observations as constraints for simulations with a new MHD code. We examine their morphology and dynamics, and produce synthetic emission maps. We find that the two jets interfere up to the stage where one of them is almost destroyed or engulfed into the second one. We are able to reproduce some of the observational features of L1551 such as the bending of the secondary jet. While the effects of orbital motion are negligible over the jets dynamical timeline, their interaction has significant impact on their morphology. If the jets are not strictly parallel, as in most observed cases, we show that the magnetic field can help the collimation and refocusing of both of the two jets.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 14:24:08 GMT" } ]
2010-11-26T00:00:00
[ [ "Murphy", "G. C.", "" ], [ "Lery", "T.", "" ], [ "O'Sullivan", "S.", "" ], [ "Spicer", "D.", "" ], [ "Bacciotti", "F.", "" ], [ "Rosen", "A.", "" ] ]
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711.3145
Michele Maggiore
Michele Maggiore
The physical interpretation of the spectrum of black hole quasinormal modes
4 pages, 2 figures; v3: added references and comments. To appear in Phys. Rev. Lett
Phys.Rev.Lett.100:141301,2008
10.1103/PhysRevLett.100.141301
null
gr-qc hep-th
null
When a classical black hole is perturbed, its relaxation is governed by a set of quasinormal modes with complex frequencies \omega= \omega_R+i\omega_I. We show that this behavior is the same as that of a collection of damped harmonic oscillators whose real frequencies are (\omega_R^2+\omega_I^2)^{1/2}, rather than simply \omega_R. Since, for highly excited modes, \omega_I >> \omega_R, this observation changes drastically the physical understanding of the black hole spectrum, and forces a reexamination of various results in the literature. In particular, adapting a derivation by Hod, we find that the area of the horizon of a Schwarzschild black hole is quantized in units \Delta A=8\pi\lpl^2, where \lpl is the Planck length (in contrast with the original result \Delta A=4\log(3) \lpl^2). The resulting area quantization does not suffer from a number of difficulties of the original proposal; in particular, it is an intrinsic property of the black hole, independent of the spin of the perturbation.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 14:58:33 GMT" }, { "version": "v2", "created": "Tue, 27 Nov 2007 14:31:04 GMT" }, { "version": "v3", "created": "Thu, 13 Mar 2008 14:57:50 GMT" } ]
2008-11-26T00:00:00
[ [ "Maggiore", "Michele", "" ] ]
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711.3146
Cristiano Ciuti
Simone De Liberato (MPQ, LPA), Cristiano Ciuti (MPQ)
Quantum model of microcavity intersubband electroluminescent devices
Published as Phys. Rev. B 77, 155321 (2008)
Physical Review B (2008) 77, 155321
10.1103/PhysRevB.77.155321
null
quant-ph cond-mat.other
null
We present a quantum theoretical analysis of the electroluminescence from an intersubband transition of a quantum well structure embedded in a planar microcavity. By using a cluster factorization method, we have derived a closed set of dynamical equations for the quantum well carrier and cavity photon occupation numbers, the correlation between the cavity field and the intersubband polarization, as well as polarization-polarization contributions. In order to model the electrical excitation, we have considered electron population tunneling from an injector and into an extractor contact. The tunneling rates have been obtained by considering the bare electronic states in the quantum well and the limit of validity of this approximation (broad-band injection) are discussed in detail. We apply the present quantum model to provide a comprehensive description of the electronic transport and optical properties of an intersubband microcavity light emitting diode, accounting for non-radiative carrier relaxation and Pauli blocking. We study the enhancement of the electroluminescence quantum efficiency passing from the weak to the strong polariton coupling regime.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 14:30:16 GMT" }, { "version": "v2", "created": "Mon, 28 Apr 2008 19:00:31 GMT" } ]
2009-11-13T00:00:00
[ [ "De Liberato", "Simone", "", "MPQ, LPA" ], [ "Ciuti", "Cristiano", "", "MPQ" ] ]
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711.3147
J. S. Marron
Haonan Wang, J. S. Marron
Object oriented data analysis: Sets of trees
Published in at http://dx.doi.org/10.1214/009053607000000217 the Annals of Statistics (http://www.imstat.org/aos/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Annals of Statistics 2007, Vol. 35, No. 5, 1849-1873
10.1214/009053607000000217
IMS-AOS-AOS0266
math.ST stat.TH
null
Object oriented data analysis is the statistical analysis of populations of complex objects. In the special case of functional data analysis, these data objects are curves, where standard Euclidean approaches, such as principal component analysis, have been very successful. Recent developments in medical image analysis motivate the statistical analysis of populations of more complex data objects which are elements of mildly non-Euclidean spaces, such as Lie groups and symmetric spaces, or of strongly non-Euclidean spaces, such as spaces of tree-structured data objects. These new contexts for object oriented data analysis create several potentially large new interfaces between mathematics and statistics. This point is illustrated through the careful development of a novel mathematical framework for statistical analysis of populations of tree-structured objects.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 14:40:32 GMT" } ]
2007-12-18T00:00:00
[ [ "Wang", "Haonan", "" ], [ "Marron", "J. S.", "" ] ]
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711.3148
Gianfranco Bertone
Mattia Fornasa (INFN Padova, IAP), Gianfranco Bertone (IAP)
Black Holes as Dark Matter Annihilation Boosters
22 pages, 11 figures
Int.J.Mod.Phys.D17:1125-1157,2008
10.1142/S0218271808012747
null
astro-ph
null
We review the consequences of the growth and evolution of Black Holes on the distribution of stars and Dark Matter (DM) around them. We focus in particular on Supermassive and Intermediate Mass Black Holes, and discuss under what circumstances they can lead to significant overdensities in the surrounding distribution of DM, thus effectively acting as DM annihilation boosters.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 16:56:33 GMT" } ]
2009-06-23T00:00:00
[ [ "Fornasa", "Mattia", "", "INFN Padova, IAP" ], [ "Bertone", "Gianfranco", "", "IAP" ] ]
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711.3149
Marie-Jean Meurs
Marie-Jean Meurs
Approche polyedrale pour le probleme du separateur (VSP)
21 pages, 4 figures
null
null
null
cs.DM
null
In an undirected connected graph G=(V,E), the vertex separator problem (VSP) asks for a partition of V into nonempty subsets A, B, C such that |C| is minimized such that there is no edge between A and B, and sizes of A and B are similar. This paper presents a polyhedral approach of the (VSP), introducing new efficient valid inequalities and providing computational tests and results.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 14:55:20 GMT" } ]
2007-11-21T00:00:00
[ [ "Meurs", "Marie-Jean", "" ] ]
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711.315
Alexandre Kisselev
A.V. Kisselev and V.A. Petrov
Hadron multiplicity in e+e- events induced by top quark pairs at the ILC energy
24 pages, 12 figures, journal version, to be published in PMC Physics A
PMC Phys.A2:3,2008
10.1186/1754-0410-2-3
null
hep-ph hep-ex
null
The average charged hadron multiplicity in the $e^+e^-$ events with the primary $t\bar{t}$-pair at the collision energy 500 GeV, as well as the average multiplicity of charged hadrons from the top quark are calculated in QCD to be $86.7 \pm 1.11$ and $41.0 \pm 0.54$, respectively.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 15:52:20 GMT" }, { "version": "v2", "created": "Wed, 5 Dec 2007 14:36:37 GMT" }, { "version": "v3", "created": "Tue, 25 Mar 2008 14:03:31 GMT" } ]
2011-01-13T00:00:00
[ [ "Kisselev", "A. V.", "" ], [ "Petrov", "V. A.", "" ] ]
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711.3151
Daniel Gamermann
D. Gamermann, E. Oset, D. Strottman and M. J. Vicente Vacas
Dynamically generated open and hidden charm mesons
Talk given in the XII international conference on hadron spectroscopy in Frascati. October 2007
null
null
null
hep-ph
null
In this presentation I explain our framework for dynamically generating resonances from the meson meson interaction. Our model generates many poles in the T-matrix which are associated with known states, while at the same time new states are predicted.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 15:01:50 GMT" } ]
2007-11-21T00:00:00
[ [ "Gamermann", "D.", "" ], [ "Oset", "E.", "" ], [ "Strottman", "D.", "" ], [ "Vacas", "M. J. Vicente", "" ] ]
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711.3152
Tobias Koch
Tobias Koch, Amos Lapidoth
Multipath Channels of Bounded Capacity
To be presented at the 2008 IEEE Information Theory Workshop (ITW) in Porto, Portugal; replaced with the version that appears in the proceedings
null
10.1109/ITW.2008.4578611
null
cs.IT math.IT
null
The capacity of discrete-time, non-coherent, multipath fading channels is considered. It is shown that if the delay spread is large in the sense that the variances of the path gains do not decay faster than geometrically, then capacity is bounded in the signal-to-noise ratio.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 15:00:39 GMT" }, { "version": "v2", "created": "Mon, 14 Apr 2008 12:19:10 GMT" } ]
2016-11-18T00:00:00
[ [ "Koch", "Tobias", "" ], [ "Lapidoth", "Amos", "" ] ]
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711.3153
Takanori Sugihara
Hirokazu Maruyama
Induction of nuclear fission by high-voltage application
11 pages
null
null
null
physics.gen-ph
null
In nuclear power generation, fissile materials are mainly used. For example, $U^{235}$ is fissile and therefore quite essential for use of nuclear energy. However, the material $U^{235}$ has very small natural abundance less than 1 %. We should seek possibility of utilizing fissionable materials such as $U^{238}$ because natural abundance of such fissionable materials is generally much larger than fissile ones. In this paper, we show that thermal neutrons with vanishing kinetic energy can induce nuclear fission when high voltage is applied to fissionable materials. To obtain this result, we use the liquid-drop model for nuclei. Finally, we propose how fissionable materials can be utilized.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 15:08:33 GMT" } ]
2008-05-29T00:00:00
[ [ "Maruyama", "Hirokazu", "" ] ]
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711.3154
Norbert Kaiser
N. Kaiser, P. de Homont, and W. Weise
In-medium chiral condensate beyond linear density approximation
15 pages, 7 figures
Phys.Rev.C77:025204,2008
10.1103/PhysRevC.77.025204
null
nucl-th
null
In-medium chiral perturbation theory is used to calculate the density dependence of the quark condensate $<\bar qq>$. The corrections beyond the linear density approximation are obtained by differentiating the interaction contributions to the energy per particle of isospin-symmetric nuclear matter with respect to the pion mass. Our calculation treats systematically the effects from one-pion exchange (with $m_\pi$-dependent vertex corrections), iterated $1\pi$-exchange, and irreducible $2\pi$-exchange including intermediate $\Delta(1232)$-isobar excitations, with Pauli-blocking corrections up to three-loop order. We find a strong and non-linear dependence of the ``dropping'' in-medium condensate on the actual value of the pion (or light quark) mass. In the chiral limit, $m_\pi=0$, chiral restoration appears to be reached already at about 1.5 times normal nuclear matter density. By contrast, for the physical pion mass, $m_\pi = 135 $MeV, the in-medium condensate stabilizes at about 60% of its vacuum value above that same density. Effects from $2\pi$-exchange with virtual $\Delta(1232)$-isobar excitations turn out to be crucial in generating such pronounced deviations from the linear density approximation above $\rho_0$. The hindered tendency towards chiral symmetry restoration provides a justification for using pions and nucleons as effective low-energy degrees of freedom at least up to twice nuclear matter density.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 15:17:30 GMT" } ]
2008-11-26T00:00:00
[ [ "Kaiser", "N.", "" ], [ "de Homont", "P.", "" ], [ "Weise", "W.", "" ] ]
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711.3155
Abdallah Khochman
Abdallah Khochman
Klein paradox and Scattering theory for the semi-classical Dirac equation
25 pages, 12 figures
null
null
null
math.SP math.AP
null
We study the Klein paradox for the semi-classical Dirac operator on $\R$ with potentials having constant limits, not necessarily the same at infinity. Using the complex WKB method, the time-independent scattering theory in terms of incoming and outgoing plane wave solutions is established. The corresponding scattering matrix is unitary. We obtain an asymptotic expansion, with respect to the semi-classical parameter $h$, of the scattering matrix in the cases of the Klein paradox, the total transmission and the total reflection. Finally, we treat the scattering problem in the zero mass case.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 15:19:41 GMT" } ]
2007-11-21T00:00:00
[ [ "Khochman", "Abdallah", "" ] ]
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711.3156
Ihor Pylyuk
I.V. Pylyuk
Three-Dimensional Ising-Like System in an External Field: Microscopic Calculation of the Free Energy in the Higher Non-Gaussian Approximation
LaTeX, 9 pages, 1 eps figure
Phase Transitions, 80 (2007) 11-16
null
null
cond-mat.stat-mech
null
An analytic method for deriving the free energy of a three-dimensional Ising-like system near the critical point in a homogeneous external field is developed in the $\rho^6$ model approximation. The mathematical description proposed for temperatures $T>T_c$ ($T_c$ is the phase-transition temperature in the absence of an external field) is valid for fields near $\tilde h_c$, where the scaling variable is of the order of unity and power series in this variable are not effective. At the limiting field $\tilde h_c$, the temperature and field effects on the system in the vicinity of the critical point are equivalent. The total free energy is obtained as a function of temperature, field and microscopic parameters of the system without using series expansions in the scaling variable. In addition to leading terms, the expression for the free energy includes the terms determining the temperature and field confluent corrections.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 18:43:25 GMT" } ]
2007-11-21T00:00:00
[ [ "Pylyuk", "I. V.", "" ] ]
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711.3157
Paul Sorba
H. Hogaasen, Paul Sorba (LAPTH)
On Quarks and Flavour Symmetry
null
null
10.1142/S0217751X08039438
LAPTH-1198/07
hep-ph physics.ed-ph
null
Hadronic spectroscopy can be introduced to students and developed rather far without requiring SU(N) flavour symmetry. In such a "minimalist" presentation, we are naturally led to comment and clarify the concept of the "generalized" Pauli principle.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 15:23:40 GMT" } ]
2009-11-13T00:00:00
[ [ "Hogaasen", "H.", "", "LAPTH" ], [ "Sorba", "Paul", "", "LAPTH" ] ]
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711.3158
Salvatore Mangano
S.Mangano (for the Antares collaboration)
Algorithm for muon electromagnetic shower reconstruction
4 pages, 4 figures, Contribution to the Roma International Conference on Astro-Particle physics, June 2007
Nucl.Instrum.Meth.A588:107-110,2008
10.1016/j.nima.2008.01.013
null
astro-ph
null
The ANTARES neutrino telescope is presently being built in the Mediterranean Sea at a depth of 2500 m. The primary aim of the experiment is the detection of high energy cosmic muon neutrinos, which are identified by the muons that are produced in charged current interactions. These muons are detected by measuring the Cerenkov light which they emit traversing the detector. Sometimes a high momentum muon produces electromagnetic showers. The subject of this paper is a method to reconstruct these showers which includes several steps: an algorithm for the fit of the muon track parameters, preselection of detected photons belonging to a shower, and a final fit with the preselected detected photons to calculate the electromagnetic shower position. Finally a comparison between data obtained with that part of the detector that is currently in operation and simulations is presented.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 17:47:25 GMT" } ]
2019-08-13T00:00:00
[ [ "Mangano", "S.", "", "for the Antares collaboration" ] ]
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711.3159
Nikos Frantzikinakis
Nikos Frantzikinakis, Emmanuel Lesigne, Mate Wierdl
Powers of sequences and recurrence
30 pages. Numerous small changes made. To appear in the Proceedings of the London Mathematical Society
null
10.1112/plms/pdn040
null
math.DS math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study recurrence, and multiple recurrence, properties along the $k$-th powers of a given set of integers. We show that the property of recurrence for some given values of $k$ does not give any constraint on the recurrence for the other powers. This is motivated by similar results in number theory concerning additive basis of natural numbers. Moreover, motivated by a result of Kamae and Mend\`es-France, that links single recurrence with uniform distribution properties of sequences, we look for an analogous result dealing with higher order recurrence and make a related conjecture.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 15:25:52 GMT" }, { "version": "v2", "created": "Wed, 8 Oct 2008 04:17:34 GMT" } ]
2014-02-26T00:00:00
[ [ "Frantzikinakis", "Nikos", "" ], [ "Lesigne", "Emmanuel", "" ], [ "Wierdl", "Mate", "" ] ]
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711.316
Michele Della Morte
Michele Della Morte
Standard Model parameters and heavy quarks on the lattice
22 pages, 13 figures, 3 tables. Proceeding of the plenary talk at The XXV International Symposium on Lattice Field Theory, July 30-4 August 2007, Regensburg, Germany. Discussion at the end of section 3 slightly changed due to the revision of ref 50
PoS LAT2007:008,2007
null
null
hep-lat hep-ph
null
I review recent progresses in heavy quarks physics on the lattice. I focus on decay constants and form factors relevant for the extraction of CKM matrix elements from experimental data. B-\bar{B} mixing is also discussed. In the last part of the paper I describe phenomenological applications of Heavy Quark Effective Theory (HQET) on the lattice, presenting in some detail the recent non-perturbative determination of the b-quark mass including O(1/m_b) corrections.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 16:06:18 GMT" }, { "version": "v2", "created": "Wed, 28 Nov 2007 10:19:12 GMT" } ]
2009-01-06T00:00:00
[ [ "Della Morte", "Michele", "" ] ]
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711.3161
Else Lytken
CDF Collaboration: T. Aaltonen, et al
Search for chargino-neutralino production in p-pbar collisions at 1.96 TeV with high pT leptons
22 pages, minor editorial comments from Phys. Rev. D reviewer
Phys.Rev.D77:052002,2008
10.1103/PhysRevD.77.052002
FERMILAB-PUB-07-613-E
hep-ex
null
We present a search for the associated production of charginos and neutralinos in p-pbar collisions at 1.96 TeV. The data were collected at the Collider Detector at Fermilab (CDF II) and correspond to integrated luminosities between 0.7 and 1.0 fb-1. We look for final states with one high pT electron or muon, and two additional leptons. Our results are consistent with the standard model expectations, and we set limits on the cross section as a function of the chargino mass in three different supersymmetric scenarios. For a specific MSSM scenario with no slepton mixing we set a 95 % C.L. limit at 151 GeV/c^2.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 15:40:34 GMT" }, { "version": "v2", "created": "Wed, 21 Nov 2007 16:35:21 GMT" }, { "version": "v3", "created": "Tue, 15 Jan 2008 11:49:10 GMT" } ]
2010-05-12T00:00:00
[ [ "CDF Collaboration", "", "" ], [ "Aaltonen", "T.", "" ] ]
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711.3162
Sudhir Kumar Pandey Dr.
S. K. Pandey, Ashwani Kumar, S. Banik, A. K. Shukla, S. R. Barman and A. V. Pimpale
Investigation of unoccupied electronic states of LaCoO$_3$ and PrCoO$_3$ using inverse photoemission spectroscopy and GGA + $U$ calculations
3 figures
Phys. Rev. B 77, 113104 (2008)
10.1103/PhysRevB.77.113104
null
cond-mat.str-el
null
The unoccupied electronic states of LaCoO$_3$ and PrCoO$_3$ are studied using room temperature inverse photoemission spectroscopy and \emph{ab initio} GGA+$\emph{U}$ band structure calculations. A fairly good agreement between experiment and theory is obtained. The intensity of the peak just above the Fermi-level is found to be very much sensitive to the hybridization of Co 3$d$ and O 2$p$ orbitals. Moreover, the band just above the Fermi-level is of Co 3$d$ character with little contribution from O 2$p$ states.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 15:43:30 GMT" } ]
2008-03-25T00:00:00
[ [ "Pandey", "S. K.", "" ], [ "Kumar", "Ashwani", "" ], [ "Banik", "S.", "" ], [ "Shukla", "A. K.", "" ], [ "Barman", "S. R.", "" ], [ "Pimpale", "A. V.", "" ] ]
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711.3163
Armin Rainer
Armin Rainer
Invariant functions in Denjoy-Carleman classes
LaTeX, 19 pages; ambiguities have been eliminated and more details are given
Ann. Global Anal. Geom. 35 (2009), No. 3, 249--266.
null
null
math.RT math.CA
null
Let $V$ be a real finite dimensional representation of a compact Lie group $G$. It is well-known that the algebra $\mathbb R[V]^G$ of $G$-invariant polynomials on $V$ is finitely generated, say by $\sigma_1,...,\sigma_p$. Schwarz proved that each $G$-invariant $C^\infty$-function $f$ on $V$ has the form $f=F(\sigma_1,...,\sigma_p)$ for a $C^\infty$-function $F$ on $\mathbb R^p$. We investigate this representation within the framework of Denjoy-Carleman classes. One can in general not expect that $f$ and $F$ lie in the same Denjoy-Carleman class $C_M$ (with $M=(M_k)$). For finite groups $G$ and (more generally) for polar representations $V$ we show that for each $G$-invariant $f$ of class $C_M$ there is an $F$ of class $C_N$ such that $f=F(\sigma_1,...,\sigma_p)$, if $N$ is strongly regular and satisfies $N_k \ge M_{km} \ep^{k+1}$, for all $k$, with $m$ an (explicitly known) integer depending only on the representation and $\epsilon>0$ independent of $k$. In particular, each $G$-invariant $(1+\delta)$-Gevrey function $f$ has the form $f=F(\sigma_1,...,\sigma_p)$ for a $(1+\delta m)$-Gevrey function $F$. Applications to equivariant functions and basic differential forms are given.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 15:45:53 GMT" }, { "version": "v2", "created": "Fri, 9 May 2008 09:12:48 GMT" } ]
2010-03-30T00:00:00
[ [ "Rainer", "Armin", "" ] ]
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711.3164
Shankaranarayanan S
Saurya Das (U. of Lethbridge), S. Shankaranarayanan (AEI, Potsdam; ICG, Portsmouth), Sourav Sur (U. of Lethbridge)
Power-law corrections to black-hole entropy via entanglement
10 pages, 5 figures, to appear in the Proceedings of "BH2, Dynamics and Thermodynamics of Blackholes and Naked Singularities", May 10-12 2007, Milano, Italy; conference website: http://www.mate.polimi.it/bh2/
null
null
null
gr-qc
null
We consider the entanglement between quantum field degrees of freedom inside and outside the horizon as a plausible source of black-hole entropy. We examine possible deviations of black hole entropy from area proportionality. We show that while the area law holds when the field is in its ground state, a correction term proportional to a fractional power of area results when the field is in a superposition of ground and excited states. We compare our results with the other approaches in the literature.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 17:41:52 GMT" } ]
2007-11-21T00:00:00
[ [ "Das", "Saurya", "", "U. of Lethbridge" ], [ "Shankaranarayanan", "S.", "", "AEI, Potsdam;\n ICG, Portsmouth" ], [ "Sur", "Sourav", "", "U. of Lethbridge" ] ]
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711.3165
Annekathrin M\"uller-Lohmann
Annekathrin M\"uller-Lohmann
CFT Interpretation of Merging Multiple SLE Traces
30 pages
null
null
ITP-UH-24/07
math-ph math.MP
null
In this paper we give a physical interpretation of the probability of a Stochastic Loewner Evolution (SLE) trace approaching a marked point in the upper half plane, e.g. on another trace. Our approach is based on the concept of fusion of boundary with bulk or other boundary fields in Conformal Field Theory (CFT). In this context we also state a proposal how the results can be extended to situations that happen not sufficiently far away from the boundary.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 15:48:54 GMT" } ]
2007-11-21T00:00:00
[ [ "Müller-Lohmann", "Annekathrin", "" ] ]
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711.3166
Derek Harland
Derek Harland and R. S. Ward
Walls and chains of planar skyrmions
11 pages, 5 figures Submitted to Phys. Rev. D
Phys.Rev.D77:045009,2008
10.1103/PhysRevD.77.045009
DCPT-07/61
hep-th
null
In planar (baby) Skyrme systems, there may be extended linear structures which resemble either domain walls or chains of skyrmions, depending on the choice of potential and boundary conditions. We show that systems with a single vacuum, for example with potential V=1-phi_3, admit chain solutions, whereas walls are ruled out by the uniqueness of the vacuum. On the other hand, in double-vacuum systems such as V=1/2*(1-phi_3^2), one has stable wall solutions, but there are no stable chains; the walls may be viewed as the primary objects in such systems, with skyrmions being made out of them.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 15:59:46 GMT" } ]
2008-11-26T00:00:00
[ [ "Harland", "Derek", "" ], [ "Ward", "R. S.", "" ] ]
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711.3167
Jean-Paul Auffray
Jean-Paul Auffray
The string string theorists forgot to notice
13 pages
null
null
null
physics.gen-ph
null
A conjecture formulated by Henri Poincare in 1912 suggests that Max Planck's elementary quantum of action constitutes an authentic "atom of motion". When the conjecture is implemented, the resulting entity, the xon, becomes "the string string theorists forgot to notice". If a string exists in Nature, then string theoretical research should be pursued.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 19:30:33 GMT" } ]
2007-11-21T00:00:00
[ [ "Auffray", "Jean-Paul", "" ] ]
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711.3168
Silja Pohjolainen
S. Pohjolainen, L. van Driel-Gesztelyi, J.L. Culhane, P.K. Manoharan, H.A. Elliott
CME Propagation Characteristics from Radio Observations
24 pages, 14 figures, the original publication is available at http://www.springerlink.com
Solar Phys.244:167-188,2007
10.1007/s11207-007-9006-6
null
astro-ph
null
We explore the relationship among three coronal mass ejections (CMEs), observed on 28 October 2003, 7 November 2004, and 20 January 2005, the type II burst-associated shock waves in the corona and solar wind, as well as the arrival of their related shock waves and magnetic clouds at 1 AU. Using six different coronal/interplanetary density models, we calculate the speeds of shocks from the frequency drifts observed in metric and decametric radio wave data. We compare these speeds with the velocity of the CMEs as observed in the plane-of-the-sky white-light observations and calculated with a cone model for the 7 November 2004 event. We then follow the propagation of the ejecta using Interplanetary Scintillation (IPS) measurements, which were available for the 7 November 2004 and 20 January 2005 events. Finally, we calculate the travel time of the interplanetary (IP) shocks between the Sun and Earth and discuss the velocities obtained from the different data. This study highlights the difficulties in making velocity estimates that cover the full CME propagation time.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 15:55:55 GMT" } ]
2009-06-23T00:00:00
[ [ "Pohjolainen", "S.", "" ], [ "van Driel-Gesztelyi", "L.", "" ], [ "Culhane", "J. L.", "" ], [ "Manoharan", "P. K.", "" ], [ "Elliott", "H. A.", "" ] ]
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711.3169
Kyrill Bugaev
Kyrill A. Bugaev
Exactly Solvable Model for the QCD Tricritcal Endpoint
14 pages, 3 figures, invited talk given at the International Workshop ``Relativistic Nuclear Physics: from Nuclotron to LHC Energies'', Kiev, Ukraine, June 18-22, 2007
Phys.Atom.Nucl.71:1585-1593,2008
10.1134/S1063778808090147
null
hep-ph
null
An inclusion of temperature and chemical potential dependent surface tension into the gas of quark-gluon bags model resolves a long standing problem of a unified description of the first and second order phase transition with the cross-over. The suggested model has an exact analytical solution and allows one to rigorously study the vicinity of the critical endpoint of the deconfinement phase transition. It is found that at the curve of a zero surface tension coefficient there must exist the surface induced phase tranition of the 2-nd or higher order. The present model predicts that the critical endpoint (CEP) of quantum chromodynamics is the tricritical endpoint.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 16:24:11 GMT" } ]
2008-11-26T00:00:00
[ [ "Bugaev", "Kyrill A.", "" ] ]
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711.317
Frans Klinkhamer
F.R. Klinkhamer, G.E. Volovik
Self-tuning vacuum variable and cosmological constant
28 pages with revtex4; v6: preprint version of published paper with detailed references
Phys.Rev.D77:085015,2008
10.1103/PhysRevD.77.085015
KA-TP-29-2007
gr-qc hep-th
null
A spacetime-independent variable is introduced which characterizes a Lorentz-invariant self-sustained quantum vacuum. For a perfect (Lorentz-invariant) quantum vacuum, the self-tuning of this variable nullifies the effective energy density which enters the low-energy gravitational field equations. The observed small but nonzero value of the cosmological constant may then be explained as corresponding to the effective energy density of an imperfect quantum vacuum (perturbed by, e.g., the presence of thermal matter).
[ { "version": "v1", "created": "Tue, 20 Nov 2007 16:32:52 GMT" }, { "version": "v2", "created": "Tue, 27 Nov 2007 16:08:42 GMT" }, { "version": "v3", "created": "Wed, 12 Dec 2007 18:53:06 GMT" }, { "version": "v4", "created": "Wed, 23 Jan 2008 19:18:29 GMT" }, { "version": "v5", "created": "Tue, 5 Feb 2008 15:51:53 GMT" }, { "version": "v6", "created": "Thu, 17 Apr 2008 14:42:48 GMT" } ]
2008-11-26T00:00:00
[ [ "Klinkhamer", "F. R.", "" ], [ "Volovik", "G. E.", "" ] ]
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711.3171
Nicole Vinh Mau
Nicole Vinh Mau (IPNO)
Deformation or spherical symmetry in 10Be and the inversion of 1/2- - 1/2+ states in 11Be
null
null
null
null
nucl-th
null
For a core plus one neutron system like 11Be we have calculated the energies of the 1/2- and 1/2+ states assuming a deformation of the core deduced from the low energy 2+ state properties or taking into account the coupling of the neutron with this 2+ state interpreted as a spherical one-phonon state. We have shown that the two derivations yield identical results if the phonon energy is neglected in the second derivation and close results in the general case.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 16:28:26 GMT" } ]
2007-11-21T00:00:00
[ [ "Mau", "Nicole Vinh", "", "IPNO" ] ]
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711.3172
Michael M. Wolf
M.M. Wolf, J. Eisert, T.S. Cubitt, J.I. Cirac
Assessing non-Markovian dynamics
5 pages, RevTex, 2 figures. (Except from typesetting) version to be published in the Physical Review Letters
Phys. Rev. Lett. 101, 150402 (2008)
10.1103/PhysRevLett.101.150402
null
quant-ph math-ph math.MP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We investigate what a snapshot of a quantum evolution - a quantum channel reflecting open system dynamics - reveals about the underlying continuous time evolution. Remarkably, from such a snapshot, and without imposing additional assumptions, it can be decided whether or not a channel is consistent with a time (in)dependent Markovian evolution, for which we provide computable necessary and sufficient criteria. Based on these, a computable measure of `Markovianity' is introduced. We discuss how the consistency with Markovian dynamics can be checked in quantum process tomography. The results also clarify the geometry of the set of quantum channels with respect to being solutions of time (in)dependent master equations.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 16:35:09 GMT" }, { "version": "v2", "created": "Sat, 23 Aug 2008 13:18:06 GMT" } ]
2009-11-13T00:00:00
[ [ "Wolf", "M. M.", "" ], [ "Eisert", "J.", "" ], [ "Cubitt", "T. S.", "" ], [ "Cirac", "J. I.", "" ] ]
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711.3173
Nicole Vinh Mau
Nicole Vinh Mau (IPNO)
T=0 effective interaction in 14N and 10B
null
null
null
null
nucl-th
null
We have calculated the 1+ and 3+, T=0 states in 14N and 10B. In a neutron-proton RPA model these two nuclei are described by the same set of equations. We first show that a bare Minnesota interaction leads to too weak binding in bothnuclei. Furthermore it does not produce a 3+ ground state in 10B as it should. Including medium effects as an exchange of phonons between the neutron-proton pair cures the desagreement in 14N but still gives a 1+ ground state in 10B with the 3+ as an excited state. The same study with a Gogny effective interaction reproduces nicely the properties of both nuclei: same agreement in 14N as previously when medium effeccts were introduced but now the 3+ in 10B becomes the ground state. This success suggests that through its density dependent term the Gogny interaction takes account of the presence of a three-body force which, in a shell model calculation, has been shown to be essential to give a 3+ ground state in 10B.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 16:31:48 GMT" } ]
2007-11-21T00:00:00
[ [ "Mau", "Nicole Vinh", "", "IPNO" ] ]
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711.3174
Edward Anderson
Edward Anderson
Seminar on Records Theory
References updated and publication details given
Proceedings of the Second Conference on Time and Matter Ed. M O' Loughlin, S Stanic and D Veberic (Nova Gorica: University 2008)
null
null
gr-qc
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In quantum gravity, one seeks to combine quantum mechanics and general relativity. In attempting to do so, one comes across the `problem of time' impasse: the notion of time is conceptually different in each of these theories. In this seminar, I consider the timeless records approach toward resolving this. Records are localized, information-containing subconfigurations of a single instant. Records theory is the study of these and of how science (or history) is to be abstracted from correlations between them. I explain how to motivate this approach, provide a ground-level structure for it and discuss what kind of further tools are needed. For a more comprehensive account with many more references, see [1].
[ { "version": "v1", "created": "Tue, 20 Nov 2007 16:57:50 GMT" }, { "version": "v2", "created": "Sat, 30 May 2009 13:41:43 GMT" } ]
2009-05-30T00:00:00
[ [ "Anderson", "Edward", "" ] ]
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711.3175
Oleg Antipin A
Oleg Antipin, David Atwood, Amarjit Soni
Search for RS gravitons via $W_L W_L$ decays
19 pages, 6 figures, 4 tables; Accepted for publication in Phys. Lett. B
Phys.Lett.B666:155-161,2008
10.1016/j.physletb.2008.07.009
BNL-HET-07/20
hep-ph hep-ex
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The original Randall-Sundrum (RS) model with a warped extra dimension along with extensions provides the possibility for a simultaneous solution to Planck-weak hierarchy problem as well as the flavor puzzle in the Standard Model (SM). The most distinctive feature of this scenario is the existence of Kaluza-Klein (KK) gravitons whose masses and couplings to the SM fields are set by the TeV scale. In some realistic versions of this framework, the largest coupling of the gravitons to the observed particles is to the top quark and unphysical Higgses ($W^{\pm}_L$ and $Z_L$) with the KK graviton (G) masses predicted to be $\gsim$ 4 TeV. We extend earlier works on the KK graviton decays to the $t\bar{t}$ final state and to the ``gold-plated'' $Z_L Z_L$ modes (with each Z decaying to $e^+ e^-$ or to $\mu^+ \mu^-$) by studying the resonant production of the gravitons and their subsequent decay to $W_L W_L$ pair. We find that with 300 $fb^{-1}$ integrated luminosity of data the semileptonic $G \to W (\to l \nu_l) W(\to 2 jets)$ mode offers a good opportunity to search for the RS KK graviton mode with mass lighter than $\sim$ 3-3.5 TeV at the CERN LHC. Efficient WW mass reconstruction in the semileptonic mode combined with an analysis of dilepton mass distribution in the purely leptonic channel, $pp \to W (\to l \nu_l) W(\to l^\prime \nu_{l^\prime})$ may help to observe KK $Z^\prime$ and KK graviton separately. Suitably defined average energy of the charged lepton in the semileptonic mode may be used to distinguish decays from longitudinal versus transverse W-bosons.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 17:59:32 GMT" }, { "version": "v2", "created": "Wed, 5 Dec 2007 21:00:57 GMT" }, { "version": "v3", "created": "Sat, 5 Jul 2008 22:13:18 GMT" } ]
2008-11-26T00:00:00
[ [ "Antipin", "Oleg", "" ], [ "Atwood", "David", "" ], [ "Soni", "Amarjit", "" ] ]
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711.3176
Seyed Abolfazl Motahari
Abolfazl S. Motahari and Amir K. Khandani
To Decode the Interference or To Consider it as Noise
submitted to IEEE Transactions on Information Theory
null
null
null
cs.IT math.IT
null
We address single-user data transmission over a channel where the received signal incurs interference from a finite number of users (interfering users) that use single codebooks for transmitting their own messages. The receiver, however, is allowed to decode interfering users' messages. This means the signal transmitted from any interfering user is either decoded or considered as noise at the receiver side. We propose the following method to obtain an achievable rate for this channel. Assuming its own data is decoded successfully, the receiver partitions the set of interfering users into two disjoint subsets, namely the set of decodable users and the set of non-decodable users. Then the transmitter's rate is chosen such that the intended signal can be jointly decoded with the set of decodable users. To show the strength of this method, we prove that for the additive Gaussian channel with Gaussian interfering users, the Gaussian distribution is optimal and the achievable rate is the capacity of this channel. To obtain the maximum achievable rate, one needs to find the maximum decodable subset of interfering users. Due to the large number of possible choices, having efficient algorithms that find the set of decodable users with maximum cardinality is desired. To this end, we propose an algorithm that enables the receiver to accomplish this task in polynomial time.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 17:34:30 GMT" } ]
2007-11-21T00:00:00
[ [ "Motahari", "Abolfazl S.", "" ], [ "Khandani", "Amir K.", "" ] ]
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711.3177
Xiang Tang
Jerome Kaminker and Xiang Tang
Hopf algebroids and secondary characteristic classes
24 pages
null
null
null
math.KT math.OA
null
We study a Hopf algebroid, $\calh$, naturally associated to the groupoid $U_n^\delta\ltimes U_n$. We show that classes in the Hopf cyclic cohomology of $\calh$ can be used to define secondary characteristic classes of trivialized flat $U_n$-bundles. For example, there is a cyclic class which corresponds to the universal transgressed Chern character and which gives rise to the continuous part of the $\rho$-invariant of Atiyah-Patodi-Singer. Moreover, these cyclic classes are shown to extend to the K-theory of the associated $C^{*}$-algebra. This point of view gives leads to homotopy invariance results for certain characteristic numbers. In particular, we define a subgroup of the cohomology of a group analogous to the Gelfand-Fuchs classes described by Connes, \cite{connes:transverse}, and show that the higher signatures associated to them are homotopy invariant.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 17:20:08 GMT" }, { "version": "v2", "created": "Tue, 4 Dec 2007 16:55:42 GMT" } ]
2007-12-04T00:00:00
[ [ "Kaminker", "Jerome", "" ], [ "Tang", "Xiang", "" ] ]
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711.3178
Eran Rabani
Roi Baer and Eran Rabani
Theory of resonance energy transfer involving nanocrystals: the role of high multipoles
12 pages, 7 figures
null
10.1063/1.2913247
null
cond-mat.mtrl-sci cond-mat.other
null
A theory for the fluorescence resonance energy transfer (FRET) between a pair of semiconducting nanocrystal quantum dots is developed. Two types of donor-acceptor couplings for the FRET rate are described: dipole-dipole (d-d) and the dipole-quadrupole (d-q) coupling. The theory builds on a simple effective mass model which is used to relate the FRET rate to measureable quantities such as the nanocrystal size, fundamental gap, effective mass, exciton radius and dielectric constant. We discuss the relative contribution to the FRET rate of the different multipole terms, the role of strong to weak confinement limits, and the effects of nanocrystal siz-es.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 17:21:45 GMT" } ]
2009-11-13T00:00:00
[ [ "Baer", "Roi", "" ], [ "Rabani", "Eran", "" ] ]
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711.3179
Andrzej Pigulski
A.Pigulski, G.Pojmanski
Beta Cephei stars in the ASAS-3 data. I. Long-term variations of periods and amplitudes
22 pages, 11 figures, accepted for publication in A&A
null
10.1051/0004-6361:20078580
null
astro-ph
null
We analysed V-filter ASAS-3 photometry of 41 known Beta Cephei-type stars. The ASAS-3 photometry was combined with the archival data, if available, to determine long-term stability of periods and amplitudes of excited modes. We detected amplitude changes in three Beta Cephei stars, BW Cru, V836 Cen, and V348 Nor. Period changes were found in KK Vel and V836 Cen. Our analysis shows that intrinsic period changes are more common among multiperiodic stars, apparently because they are caused by some kind of mode interaction. In addition, we found new modes for seven stars, and for ten others we provide new solutions or remove ambiguities in the detected frequencies. One candidate hybrid Beta Cephei/SPB star, HD133823, is discovered.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 17:25:16 GMT" } ]
2009-11-13T00:00:00
[ [ "Pigulski", "A.", "" ], [ "Pojmanski", "G.", "" ] ]
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711.318
Marina Seikel
Marina Seikel and Dominik J. Schwarz
How strong is the evidence for accelerated expansion?
16 pages, 3 figures
JCAP 0802:007,2008
10.1088/1475-7516/2008/02/007
BI-TP 2007/36
astro-ph
null
We test the present expansion of the universe using supernova type Ia data without making any assumptions about the matter and energy content of the universe or about the parameterization of the deceleration parameter. We assume the cosmological principle to apply in a strict sense. The result strongly depends on the data set, the light-curve fitting method and the calibration of the absolute magnitude used for the test, indicating strong systematic errors. Nevertheless, in a spatially flat universe there is at least a 5 sigma evidence for acceleration which drops to 1.8 sigma in an open universe.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 17:26:24 GMT" }, { "version": "v2", "created": "Mon, 26 Nov 2007 17:14:30 GMT" } ]
2009-06-23T00:00:00
[ [ "Seikel", "Marina", "" ], [ "Schwarz", "Dominik J.", "" ] ]
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711.3181
Natalia Ivanova
Natalia Ivanova, Craig O. Heinke and Frederic A. Rasio
Neutron Stars in Globular Clusters
5 pages, 3 figures, to appear in "Dynamical Evolution of Dense Stellar Systems", IAUS 246, ed. E. Vesperini
null
10.1017/S1743921308015846
null
astro-ph
null
Dynamical interactions that occur between objects in dense stellar systems are particularly important for the question of formation of X-ray binaries. We present results of numerical simulations of 70 globular clusters with different dynamical properties and a total stellar mass of 2*10^7 Msun. We find that in order to retain enough neutron stars to match observations we must assume that NSs can be formed via electron-capture supernovae. Our simulations explain the observed dependence of the number of LMXBs on ``collision number'' as well as the large scatter observed between different globular clusters. For millisecond pulsars, we obtain good agreement between our models and the numbers and characteristics of observed pulsars in the clusters Terzan 5 and 47 Tuc
[ { "version": "v1", "created": "Tue, 20 Nov 2007 17:30:04 GMT" } ]
2009-11-13T00:00:00
[ [ "Ivanova", "Natalia", "" ], [ "Heinke", "Craig O.", "" ], [ "Rasio", "Frederic A.", "" ] ]
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711.3182
Michael Bauer
M. Bauer, W. Pietsch, G. Trinchieri, D. Breitschwerdt, M. Ehle, M.J. Freyberg, A.M. Read
XMM-Newton observations of the diffuse X-ray emission in the starburst galaxy NGC 253
25 pages, 12 Figures, changed content, accepted for publication in A&A
null
10.1051/0004-6361:20078935
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Aims: We present a study of the diffuse X-ray emission in the halo and the disc of the starburst galaxy NGC 253. Methods: After removing point-like sources, we analysed XMM-Newton images, hardness ratio maps and spectra from several regions in the halo and the disc. We introduce a method to produce vignetting corrected images from the EPIC pn data, and we developed a procedure that allows a correct background treatment for low surface brightness spectra, using a local background, together with closed filter observations. Results: Most of the emission from the halo is at energies below 1 keV. In the disc, also emission at higher energies is present. The extent of the diffuse emission along the major axis of the disc is 13.6 kpc. The halo resembles a horn structure and reaches out to ~9 kpc perpendicular to the disc. Disc regions that cover star forming regions, like spiral arms, show harder spectra than regions with lower star forming activity. Models for spectral fits of the disc regions need at least three components: two thermal plasmas with solar abundances plus a power law and galactic foreground absorption. Temperatures are between 0.1 and 0.3 keV and between 0.3 and 0.9 keV for the soft and the hard component, respectively. The power law component may indicate an unresolved contribution from X-ray binaries in the disc. The halo emission is not uniform, neither spatially nor spectrally. The southeastern halo is softer than the northwestern halo. To model the spectra in the halo, we needed two thermal plasmas with solar abundances plus galactic foreground absorption. Temperatures are around 0.1 and 0.3 keV. A comparison between X-ray and UV emission shows that both originate from the same regions.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 17:36:48 GMT" }, { "version": "v2", "created": "Sat, 27 Sep 2008 15:37:20 GMT" } ]
2009-11-13T00:00:00
[ [ "Bauer", "M.", "" ], [ "Pietsch", "W.", "" ], [ "Trinchieri", "G.", "" ], [ "Breitschwerdt", "D.", "" ], [ "Ehle", "M.", "" ], [ "Freyberg", "M. J.", "" ], [ "Read", "A. M.", "" ] ]
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711.3183
Narad Rampersad
Terry Anderson, John Loftus, Narad Rampersad, Nicolae Santean, Jeffrey Shallit
Detecting palindromes, patterns, and borders in regular languages
Full version of a paper submitted to LATA 2008. This is a new version with John Loftus added as a co-author and containing new results on unbordered words
null
null
null
cs.CC cs.DM cs.FL
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Given a language L and a nondeterministic finite automaton M, we consider whether we can determine efficiently (in the size of M) if M accepts at least one word in L, or infinitely many words. Given that M accepts at least one word in L, we consider how long a shortest word can be. The languages L that we examine include the palindromes, the non-palindromes, the k-powers, the non-k-powers, the powers, the non-powers (also called primitive words), the words matching a general pattern, the bordered words, and the unbordered words.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 17:38:47 GMT" }, { "version": "v2", "created": "Mon, 9 Jun 2008 14:25:57 GMT" } ]
2009-04-14T00:00:00
[ [ "Anderson", "Terry", "" ], [ "Loftus", "John", "" ], [ "Rampersad", "Narad", "" ], [ "Santean", "Nicolae", "" ], [ "Shallit", "Jeffrey", "" ] ]
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711.3184
A. N. Ivanov
A. N. Ivanov, M. Faber, R. Reda, P. Kienle
Weak decays of H-like 140Pr58+ and He-like 140Pr57+ ions
Latex 14 pages, no figures, we have corrected some references, discussed in more detail the ratio of the EC-decay constants of the H-like and He-like ions and added Appendices with the detailed calculations of the weak decay constants
Phys.Rev.C78:025503,2008
10.1103/PhysRevC.78.025503
null
nucl-th hep-ph nucl-ex
null
The nuclear K-shell electron-capture (EC)and positron (beta+) decay constants, lambda_(EC) and lambda_(beta^+) of H-like 140Pr58+ and He-like 140Pr57+ ions, measured recently in the ESR ion storage ring at GSI, were calculated using standard weak interaction theory. The calculated ratios R = lambda_(EC)/lambda_(beta^+) of the decay constants agree with the experimental values within an accuracy better than 3 %.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 17:41:48 GMT" }, { "version": "v2", "created": "Sun, 10 Feb 2008 16:38:01 GMT" } ]
2008-11-26T00:00:00
[ [ "Ivanov", "A. N.", "" ], [ "Faber", "M.", "" ], [ "Reda", "R.", "" ], [ "Kienle", "P.", "" ] ]
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711.3185
Dennis Sivers Dr.
Dennis Sivers
Chiral Dynamics and Single-Spin Asymmetries
6 Pages 2 figures Based on an invited talk presented at Dspin-07 Workshop
null
null
null
hep-ph
null
Parity-conserving single-spin asymmetries provide a specific measure of coherent spin-orbit dynamics in quantum chromodynamics. The origin of these effects can be traced to the interplay of chiral dynamics and confinement in the theory. The most elegant display of the relevant mechanisms occurs in the Collins functions and the polarizing fragmentation functions and fracture functions for particles with spin. In the nucleon, these same dynamical mechanisms generate virtual quantum structures leading to the Boer-Mulders functions and orbital distributions. Two complementary formalisms for these distributions appear. The familiar gauge-link formalism incorporates oll nonperturbative dynamics into nonlocal correlators. The constructive formalism introduced by the author describes distributions normalized to an intrinsic property of the nucleon, namely, the currents specified in the Bakker-Leader-Trueman sum rule. The connection between these two approaches can be explored in the process dependence of single-spin asymmetries in various hard-scattering processes. The study of the SU(2) Weyl-Dirac equation in spherical coordinates allows typical Wilson operators that determine this process dependence to be evaluated in the coordinate gauge.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 17:54:02 GMT" } ]
2007-11-21T00:00:00
[ [ "Sivers", "Dennis", "" ] ]
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711.3186
Remo Collet
R. Collet, M. Asplund, R. Trampedach
Beyond 1D: spectral line formation with 3D hydrodynamical model atmospheres of red giants
5 pages, 6 figures; to appear in Mem. Soc. Astr. Italiana, Vol. 79/2 (proc. Cefalu' Workshop on "XXI Century Challenges for Stellar Evolution", ed. S. Cassisi & M. Salaris)
null
null
null
astro-ph
null
We present the results of realistic, 3D, hydrodynamical, simulations of surface convection in red giant stars with varying effective temperatures and metallicities. We use the convection simulations as time-dependent, hydrodynamical, model atmospheres to compute spectral line profiles for a number of ions and molecules under the assumption of local thermodynamic equilibrium (LTE). We compare the results with the predictions of line formation calculations based on 1D, hydrostatic, model stellar atmospheres in order to estimate the impact of 3D models on the derivation of elemental abundances. We find large negative 3D-1D LTE abundance corrections (typically -0.5 to -1 dex) for weak low-excitation lines from molecules and neutral species in the very low metallicity cases. Finally, we discuss the extent of departures from LTE in the case of neutral iron spectral line formation.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 18:04:16 GMT" } ]
2007-11-21T00:00:00
[ [ "Collet", "R.", "" ], [ "Asplund", "M.", "" ], [ "Trampedach", "R.", "" ] ]
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711.3187
Tommy Anderberg
Tommy Anderberg
In defense of local textures (and other Higgs gradients)
4 pages, no figures. v2: Fixed typos, reference order. v3: Corrected serious error, added clarifying remarks, acknowledgment. v4: Added clarifying remarks. v5: Minor omissions/typos fixed
null
null
null
astro-ph hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Cruz et al. recently showed that the CMB cold spot can be explained by a GUT-scale texture. But following Turok's argument that gauged configurations always relax quickly, they posit a global symmetry, without obvious relation to GUTs. An observation by Nambu invalidates Turok's argument when the broken symmetry group has commuting generators. This is demonstrated explicitly in the standard model of electroweak interactions and holds generally for intermediate SSB stages in GUTs. The cold spot could therefore be due to a GUT texture, and electroweak Higgs gradients may evolve indefinitely.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 19:02:23 GMT" }, { "version": "v2", "created": "Wed, 21 Nov 2007 19:56:55 GMT" }, { "version": "v3", "created": "Fri, 28 Mar 2008 01:46:48 GMT" }, { "version": "v4", "created": "Thu, 28 Aug 2008 18:51:36 GMT" }, { "version": "v5", "created": "Sat, 18 Oct 2008 07:29:20 GMT" } ]
2008-10-18T00:00:00
[ [ "Anderberg", "Tommy", "" ] ]
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711.3188
Paul Stokes
Paul Stokes and Saiful I. Khondaker
Local-gated single-walled carbon nanotube field effect transistors assembled by AC dielectrophoresis
6 pages, 3 figures
Nanotechnology 19, 175202 (2008)
10.1088/0957-4484/19/17/175202
null
cond-mat.mtrl-sci cond-mat.mes-hall
null
We present a simple and scalable technique for the fabrication of solution processed & local gated carbon nanotube field effect transistors (CNT-FETs). The approach is based on directed assembly of individual single wall carbon nanotube from dichloroethane via AC dielectrophoresis (DEP) onto pre-patterned source and drain electrodes with a local aluminum gate in the middle. Local-gated CNT-FET devices display superior performance compared to global back gate with on-off ratios 10^4 and maximum subthreshold swings of 170 mV/dec. The local bottom-gated DEP assembled CNT-FETs will facilitate large scale fabrication of complementary metal-oxide-semiconductor (CMOS) compatible nanoelectronic devices.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 18:30:25 GMT" }, { "version": "v2", "created": "Mon, 21 Jan 2008 17:52:37 GMT" } ]
2009-11-13T00:00:00
[ [ "Stokes", "Paul", "" ], [ "Khondaker", "Saiful I.", "" ] ]
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711.3189
Henning Esbensen
Henning Esbensen and Serban Misicu
Hindrance of ^{16}O+^{208}Pb fusion at extreme sub-barrier energies
text and 8 fifures
Phys.Rev.C76:054609,2007
10.1103/PhysRevC.76.054609
null
nucl-th
null
We analyze the fusion data for $^{16}$O+$^{208}$Pb using coupled-channels calculations. We include couplings to the low-lying surface excitations of the projectile and target and study the effect of the ($^{16}$O,$^{17}$O) one-neutron pickup. The hindrance of the fusion data that is observed at energies far below the Coulomb barrier cannot be explained by a conventional ion-ion potential and defining the fusion in terms of ingoing-wave boundary conditions (IWBC). We show that the hindrance can be explained fairly well by applying the M3Y double-folding potential which has been corrected with a calibrated, repulsive term that simulates the effect of nuclear incompressibility. We show that the coupling to one-neutron transfer channels plays a crucial role in improving the fit to the data. The best fit is achieved by increasing the transfer strength by 25% relative to the strength that is required to reproduce the one-neutron transfer data. The larger strength is not unrealistic because the calculated inelastic plus transfer cross section is in good agreement with the measured quasielastic cross section. We finally discuss the problem of reproducing the fusion data at energies far above the Coulomb barrier. Here we do not account for the data when we apply the IWBC but the discrepancy is essentially eliminated by applying the M3Y+repulsion potential and a weak, short-ranged imaginary potential.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 19:18:32 GMT" } ]
2008-11-26T00:00:00
[ [ "Esbensen", "Henning", "" ], [ "Misicu", "Serban", "" ] ]
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711.319
Benjamin Cowan
Benjamin M. Cowan
Three-dimensional dielectric photonic crystal structures for laser-driven acceleration
null
Phys.Rev.ST Accel.Beams 11:011301,2008
10.1103/PhysRevSTAB.11.011301
SLAC-PUB-12961
physics.acc-ph physics.optics
null
We present the design and simulation of a three-dimensional photonic crystal waveguide for linear laser-driven acceleration in vacuum. The structure confines a synchronous speed-of-light accelerating mode in both transverse dimensions. We report the properties of this mode, including sustainable gradient and optical-to-beam efficiency. We present a novel method for confining a particle beam using optical fields as focusing elements. This technique, combined with careful structure design, is shown to have a large dynamic aperture and minimal emittance growth, even over millions of optical wavelengths.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 19:20:02 GMT" } ]
2009-12-10T00:00:00
[ [ "Cowan", "Benjamin M.", "" ] ]
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711.3191
Ben Green
Ben Green, Terence Tao
The distribution of polynomials over finite fields, with applications to the Gowers norms
33 pages
null
null
null
math.CO math.NT
null
In this paper we investigate the uniform distribution properties of polynomials in many variables and bounded degree over a fixed finite field F of prime order. Our main result is that a polynomial P : F^n -> F is poorly-distributed only if P is determined by the values of a few polynomials of lower degree, in which case we say that P has small rank. We give several applications of this result, paying particular attention to consequences for the theory of the so-called Gowers norms. We establish an inverse result for the Gowers U^{d+1}-norm of functions of the form f(x)= e_F(P(x)), where P : F^n -> F is a polynomial of degree less than F, showing that this norm can only be large if f correlates with e_F(Q(x)) for some polynomial Q : F^n -> F of degree at most d. The requirement deg(P) < |F| cannot be dropped entirely. Indeed, we show the above claim fails in characteristic 2 when d = 3 and deg(P)=4, showing that the quartic symmetric polynomial S_4 in F_2^n has large Gowers U^4-norm but does not correlate strongly with any cubic polynomial. This shows that the theory of Gowers norms in low characteristic is not as simple as previously supposed. This counterexample has also been discovered independently by Lovett, Meshulam, and Samorodnitsky. We conclude with sundry other applications of our main result, including a recurrence result and a certain type of nullstellensatz.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 19:24:57 GMT" } ]
2007-11-21T00:00:00
[ [ "Green", "Ben", "" ], [ "Tao", "Terence", "" ] ]
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711.3192
Vladimir Bytev
E. A. Kuraev, S. Bakmaev, E. Tomasi-Gustafsson, V. V. Bytev
Sum rule for the double virtual Compton scattering
14 pages 4 figures
null
null
null
hep-ph
null
The two photon exchange amplitude is investigated in frame of analytic properties of the virtual Compton scattering amplitude as a function of the invariant mass squared of the intermediate hadronic state. A sum rule is built, based on arguments from analyticity. It relates the differential cross section of elastic electron-proton scattering including form factors, and the cross section of inelastic scattering channel, with a contribution of nucleon anti-nucleon pair production arising from the Fermi statistics. The last term is calculated in frame of a simple model of nucleon-pion interaction.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 19:30:51 GMT" } ]
2007-11-21T00:00:00
[ [ "Kuraev", "E. A.", "" ], [ "Bakmaev", "S.", "" ], [ "Tomasi-Gustafsson", "E.", "" ], [ "Bytev", "V. V.", "" ] ]
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711.3193
Shaouly Bar-Shalom
Shaouly Bar-Shalom, Arvind Rajaraman
Models and Phenomenology of Maximal Flavor Violation
Latex, 4 pages, 1 figure. Version as published
Phys.Rev.D77:095011,2008
10.1103/PhysRevD.77.095011
null
hep-ph
null
We consider models of maximal flavor violation (MxFV), in which a new scalar mediates large q_3 <-> q_1 or q_3 <-> q_2 flavor changing transitions (q_i is an i'th generation quark), while q_3 <-> q_3 transitions are suppressed, e.g., \xi_{31}, \xi_{13} ~ V_{tb} and \xi_{33} ~ V_{td}, where \xi_{ij} are the new scalar couplings to quarks and V is the CKM matrix. We show that, contrary to the conventional viewpoint, such models are not ruled out by the existing low energy data on K^0, B^0 and D^0 oscillations and rare K and B-decays. We also show that these models of MxFV can have surprising new signatures at the LHC and the Tevatron.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 19:31:35 GMT" }, { "version": "v2", "created": "Wed, 7 May 2008 23:06:16 GMT" } ]
2008-11-26T00:00:00
[ [ "Bar-Shalom", "Shaouly", "" ], [ "Rajaraman", "Arvind", "" ] ]
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711.3194
Timothy Andersen
T. D. Andersen and C. C. Lim
Negative specific heat for quasi-2D vortex structures in electron plasmas: an explicit, closed-form derivation
12 pages
null
null
null
math-ph math.MP
null
Negative specific heat is a dramatic phenomenon where processes decrease in temperature when adding energy. It has been observed in gravo-thermal collapse of globular clusters. We now report finding this phenomenon in bundles of nearly parallel, periodic, single-sign generalized vortex filaments in the electron magnetohydrodynamic (EMH) model for the unbounded plane under strong magnetic confinement. We derive the specific heat using a steepest descent method and a mean field property. Our derivations show that as temperature increases, the overall size of the system increases exponentially and the energy drops. The implication of negative specific heat is a runaway reaction, resulting in a collapsing inner core surrounded by an expanding halo of filaments.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 19:40:08 GMT" }, { "version": "v2", "created": "Fri, 29 Feb 2008 21:15:35 GMT" } ]
2008-02-29T00:00:00
[ [ "Andersen", "T. D.", "" ], [ "Lim", "C. C.", "" ] ]
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711.3195
Behnam Farid
Behnam Farid
Reply to ``Comment on `On the Luttinger theorem concerning number of particles in the ground states of systems of interacting fermions','' arXiv:0711.3093v1, by A. Rosch
7 pages
null
null
ITP-UU-2007/62
cond-mat.str-el cond-mat.mtrl-sci cond-mat.supr-con
null
We reply to the Comment by Achim Rosch [1] (arXiv:0711.3093v1) who challenges our finding in Ref. [2] (arXiv:0711.0952v1) with regard to the validity of the Luttinger theorem in the cases of Mott insulating N-particle ground states (even) when the chemical potential used in applying this theorem coincides with the zero-temperature limit of the chemical potential satisfying the equation of state corresponding to N particles. Rosch further argues that the strong-coupling expression for the single-particle Green function presented in Ref. [3] (arXiv:cond-mat/0602656v2) and analyzed in Ref. [2] does not imply destruction of the Mott insulating state at half-filling as a result of an arbitrary weak hopping contribution that breaks particle-hole symmetry and therefore suggests that our conclusion in Ref. [2] to the contrary were incorrect. Here we show the shortcomings of Rosch's arguments.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 20:53:39 GMT" } ]
2007-11-21T00:00:00
[ [ "Farid", "Behnam", "" ] ]
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711.3196
Wystan Benbow
HESS Collaboration: F. Aharonian, et al
Upper Limits from HESS AGN Observations in 2005-2007
8 Pages, 2 Figures; Accepted on Nov 6, 2007 for publication in Astronomy & Astrophysics
A&A 478, 387-393 (2008)
10.1051/0004-6361:20078604
null
astro-ph
null
AIMS: Very high energy (VHE; E>100 GeV) gamma-ray studies were performed for 18 active galactic nuclei (AGN) from a variety of AGN classes. METHODS: VHE observations of a sample of 14 AGN, considered candidate VHE emitters, were made with the High Energy Stereoscopic System (HESS) between January 2005 and July 2007. Large-zenith-angle observations of three northern AGN (Mkn 421, Mkn 501, 1ES 1218+304), known to emit VHE gamma rays, were also performed in order to sample their spectral energy distributions (SEDs) above 1 TeV. In addition, the VHE flux from 1ES 1101-232, previously detected by HESS in 2004-2005, was monitored during 2006 and 2007. RESULTS: As significant detections from the HESS observation program are reported elsewhere, the results reported here are primarily integral flux upper limits. The average exposure for each of the 14 VHE-candidate AGN is ~7 h live time, and the observations have an average energy threshold between 230 GeV and 590 GeV. Upper limits for these 14 AGN range from <0.9% to <4.9% of the Crab Nebula flux, and eight of these are the most constraining ever reported for the object. The brief (<2.2 h each) large-zenith-angle observations yield upper limits for Mkn 501 (<20% Crab above 2.5 TeV) and 1ES 1218+304 (<17% Crab above 1.0 TeV), and a marginal detection (3.5 sigma) of Mkn 421 (50% Crab above 2.1 TeV). 1ES 1101-232 was marginally detected (3.6 sigma, 1.7% Crab above 260 GeV) during the 2006 (13.7 h live time) observations, but not in the 2007 (4.6 h live time) data. The upper limit in 2007 (<1.9% Crab above 260 GeV) is below the average flux measured by HESS from 2004-2006.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 19:43:59 GMT" } ]
2008-01-29T00:00:00
[ [ "HESS Collaboration", "", "" ], [ "Aharonian", "F.", "" ] ]
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711.3197
Igor M. Suslov
I. M. Suslov (P.L.Kapitza Institute for Physical Problems, Moscow, Russia)
How to realize "a sense of humour" in computers ?
14 pages, 6 figures included
null
null
null
cs.CL cs.AI q-bio.NC
null
Computer model of a "sense of humour" suggested previously [arXiv:0711.2058, 0711.2061, 0711.2270] is raised to the level of a realistic algorithm.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 19:57:23 GMT" } ]
2007-11-27T00:00:00
[ [ "Suslov", "I. M.", "", "P.L.Kapitza Institute for Physical Problems, Moscow,\n Russia" ] ]
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711.3198
Taoufik Hmidi
Taoufik Hmidi and Sahbi Keraani
On the global well-posedness of the Boussinesq system with zero viscosity
20 pages
null
null
null
math.AP
null
In this paper we prove the global well-posedness of the two-dimensional Boussinesq system with zero viscosity for rough initial data.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 20:05:18 GMT" } ]
2007-11-21T00:00:00
[ [ "Hmidi", "Taoufik", "" ], [ "Keraani", "Sahbi", "" ] ]
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711.3199
Luciano da Fontoura Costa
Luciano da F.Costa, Osvaldo N. Oliveira Jr., Gonzalo Travieso, Francisco A. Rodrigues, Paulino R. Villas Boas, Lucas Antiqueira, Matheus P. Viana, and Luis E. C. da Rocha
Analyzing and Modeling Real-World Phenomena with Complex Networks: A Survey of Applications
103 pages, 3 figures and 7 tables. A working manuscript, suggestions are welcomed
Advances in Physics, V. 60(3) p. 329-412 (2011)
10.1080/00018732.2011.572452
null
physics.soc-ph physics.comp-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The success of new scientific areas can be assessed by their potential for contributing to new theoretical approaches and in applications to real-world problems. Complex networks have fared extremely well in both of these aspects, with their sound theoretical basis developed over the years and with a variety of applications. In this survey, we analyze the applications of complex networks to real-world problems and data, with emphasis in representation, analysis and modeling, after an introduction to the main concepts and models. A diversity of phenomena are surveyed, which may be classified into no less than 22 areas, providing a clear indication of the impact of the field of complex networks.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 20:30:27 GMT" }, { "version": "v2", "created": "Fri, 16 May 2008 18:39:58 GMT" }, { "version": "v3", "created": "Tue, 16 Sep 2008 20:03:59 GMT" } ]
2012-08-09T00:00:00
[ [ "Costa", "Luciano da F.", "" ], [ "Oliveira", "Osvaldo N.", "Jr." ], [ "Travieso", "Gonzalo", "" ], [ "Rodrigues", "Francisco A.", "" ], [ "Boas", "Paulino R. Villas", "" ], [ "Antiqueira", "Lucas", "" ], [ "Viana", "Matheus P.", "" ], [ "da Rocha", "Luis E. C.", "" ] ]
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711.32
George Elliott
George A. Elliott
Towards a theory of classification
26 pages
null
null
null
math.OA math.CT
null
The well-known difficulties arising in a classification which is not set-theoretically trivial---involving what is sometimes called a non-smooth quotient---have been overcome in a striking way in the theory of operator algebras by the use of what might be called a classification functor---the very existence of which is already a surprise. Here the notion of such a functor is developed abstractly, and a number of examples are considered (including those which have arisen for various classes of operator algebras).
[ { "version": "v1", "created": "Tue, 20 Nov 2007 20:09:58 GMT" } ]
2007-11-21T00:00:00
[ [ "Elliott", "George A.", "" ] ]
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711.3201
Alexander Fish
A. Fish
Polynomial largeness of sumsets and totally ergodic sets
Preliminary version
null
null
null
math.DS math.CO
null
We prove that a sumset of a TE subset of (\N) (these sets can be viewed as "aperiodic" sets) with a set of positive upper density intersects a set of values of any polynomial with integer coefficients., i.e. for any (A \subset \N ) a TE set, for any (p(n) \in \Z[n]: \deg{p(n)} > 0, p(n) \to_{n \to \infty} \infty ) and any subset (B \subset \N ) of positive upper density we have (R_p = A+B \cap \{p(n) | n \in \N \} \neq \emptyset). For (A ) a WM set (subclass of TE sets) we prove that (R_p ) has lower density 1. In addition we obtain a generalization of the latter result to the case of several polynomials and several WM sets.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 20:25:56 GMT" } ]
2007-11-21T00:00:00
[ [ "Fish", "A.", "" ] ]
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711.3202
Eduardo Mucciolo
Caio H. Lewenkopf, Eduardo R. Mucciolo, Antonio H. Castro Neto
Conductivity and Fano factor in disordered graphene
4 pages, 5 figures
Phys. Rev. B 77, 081410R (2008)
10.1103/PhysRevB.77.081410
null
cond-mat.mes-hall
null
Using the recursive Green's function method, we study the problem of electron transport in a disordered single-layer graphene sheet. The conductivity is of order $e^2/h$ and its dependence on the carrier density has a scaling form that is controlled solely by the disorder strength and the ratio between the sample size and the correlation length of the disorder potential. The shot noise Fano factor is shown to have a narrow dip near the neutrality point for weak disorder and to develop a nearly doping independent behavior at strong disorder. Our results are in good qualitative and quantitative agreement with experiments and provide a way for extracting microscopic information about the magnitude of extrinsic disorder in graphene.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 20:53:51 GMT" }, { "version": "v2", "created": "Mon, 4 Feb 2008 16:56:51 GMT" } ]
2009-11-13T00:00:00
[ [ "Lewenkopf", "Caio H.", "" ], [ "Mucciolo", "Eduardo R.", "" ], [ "Neto", "Antonio H. Castro", "" ] ]
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711.3203
Christian Buth
Christian Buth, Robin Santra
Theory of x-ray absorption by laser-aligned symmetric-top molecules
14 pages, 4 figures, 1 table, RevTeX4, revised
Phys. Rev. A 77, 013413 (2008) (13 pages), republication in Virtual Journal of Ultrafast Science 7, issue 2 (2008)
10.1103/PhysRevA.77.013413
null
physics.chem-ph physics.optics
null
We devise a theory of x-ray absorption by symmetric-top molecules which are aligned by an intense optical laser. Initially, the density matrix of the system is composed of the electronic ground state of the molecules and a thermal ensemble of rigid-rotor eigenstates. We formulate equations of motion of the two-color (laser plus x rays) rotational-electronic problem. The interaction with the laser is assumed to be nonresonant; it is described by an electric dipole polarizability tensor. X-ray absorption is approximated as a one-photon process. It is shown that the equations can be separated such that the interaction with the laser can be treated independently of the x rays. The laser-only density matrix is propagated numerically. After each time step, the x-ray absorption is calculated. We apply our theory to study adiabatic alignment of bromine molecules (Br2). The required dynamic polarizabilities are determined using the ab initio linear response methods coupled-cluster singles (CCS), second-order approximate coupled-cluster singles and doubles (CC2), and coupled-cluster singles and doubles (CCSD). For the description of x-ray absorption on the sigma_g 1s --> sigma_u 4p resonance, a parameter-free two-level model is used for the electronic structure of the molecules. Our theory opens up novel perspectives for the quantum control of x-ray radiation.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 20:35:28 GMT" }, { "version": "v2", "created": "Fri, 1 Feb 2008 21:45:01 GMT" } ]
2008-02-23T00:00:00
[ [ "Buth", "Christian", "" ], [ "Santra", "Robin", "" ] ]
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711.3204
Parsa Bonderson
Parsa Bonderson and J. K. Slingerland
Fractional Quantum Hall Hierarchy and the Second Landau Level
10 pages; v2: many additional details and discussion included to help clarify the original results, including a composite fermion type formulation of some of the states; v3: minor corrections
Phys. Rev. B 78, 125323 (2008)
10.1103/PhysRevB.78.125323
null
cond-mat.mes-hall
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We generalize the fractional quantum Hall hierarchy picture to apply to arbitrary, possibly non-Abelian, fractional quantum Hall states. Applying this to the nu = 5/2 Moore-Read state, we construct new explicit trial wavefunctions to describe the fractional quantum Hall effect in the second Landau level. The resulting hierarchy of states, which reproduces the filling fractions of all observed Hall conductance plateaus in the second Landau level, is characterized by electron pairing in the ground state and an excitation spectrum that includes non-Abelian anyons of the Ising type. We propose this as a unifying picture in which p-wave pairing characterizes the fractional quantum Hall effect in the second Landau level.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 20:40:12 GMT" }, { "version": "v2", "created": "Tue, 19 Aug 2008 19:51:53 GMT" }, { "version": "v3", "created": "Thu, 18 Sep 2008 20:51:17 GMT" } ]
2008-09-29T00:00:00
[ [ "Bonderson", "Parsa", "" ], [ "Slingerland", "J. K.", "" ] ]
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711.3205
Caleb Lo
Caleb K. Lo, Sriram Vishwanath and Robert W. Heath Jr
Relay Subset Selection in Wireless Networks Using Partial Decode-and-Forward Transmission
27 pages, 5 figures, submitted to the IEEE Transactions on Vehicular Technology, revised May 2008
null
null
null
cs.IT math.IT
null
This paper considers the problem of selecting a subset of nodes in a two-hop wireless network to act as relays in aiding the communication between the source-destination pair. Optimal relay subset selection with the objective of maximizing the overall throughput is a difficult problem that depends on multiple factors including node locations, queue lengths and power consumption. A partial decode-and-forward strategy is applied in this paper to improve the tractability of the relay selection problem and performance of the overall network. Note that the number of relays selected ultimately determines the performance of the network. This paper benchmarks this performance by determining the net diversity achieved using the relays selected and the partial decode-and-forward strategy. This framework is subsequently used to further transform relay selection into a simpler relay placement problem, and two proximity-based approximation algorithms are developed to determine the appropriate set of relays to be selected in the network. Other selection strategies such as random relay selection and a greedy algorithm that relies on channel state information are also presented. This paper concludes by showing that the proposed proximity-based relay selection strategies yield near-optimal expected rates for a small number of selected relays.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 20:40:20 GMT" }, { "version": "v2", "created": "Thu, 22 May 2008 21:53:27 GMT" } ]
2008-05-23T00:00:00
[ [ "Lo", "Caleb K.", "" ], [ "Vishwanath", "Sriram", "" ], [ "Heath", "Robert W.", "Jr" ] ]
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711.3206
Charles M. Marcus
L. DiCarlo, J. R. Williams, Yiming Zhang, D. T. McClure, C. M. Marcus
Shot Noise in Graphene
related papers available at http://marcuslab.harvard.edu
Phys. Rev. Lett. 100, 156801 (2008).
10.1103/PhysRevLett.100.156801
null
cond-mat.mes-hall
null
We report measurements of current noise in single- and multi-layer graphene devices. In four single-layer devices, including a p-n junction, the Fano factor remains constant to within +/-10% upon varying carrier type and density, and averages between 0.35 and 0.38. The Fano factor in a multi-layer device is found to decrease from a maximal value of 0.33 at the charge-neutrality point to 0.25 at high carrier density. These results are compared to theoretical predictions for shot noise in ballistic and disordered graphene.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 20:43:09 GMT" }, { "version": "v2", "created": "Wed, 21 Nov 2007 19:46:55 GMT" }, { "version": "v3", "created": "Thu, 21 Feb 2008 09:15:03 GMT" } ]
2009-11-13T00:00:00
[ [ "DiCarlo", "L.", "" ], [ "Williams", "J. R.", "" ], [ "Zhang", "Yiming", "" ], [ "McClure", "D. T.", "" ], [ "Marcus", "C. M.", "" ] ]
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711.3207
Yanwen Liu
D0 Collaboration: V.M Abazov, et al
Search for sneutrino particles in e + mu final states in ppbar collisions at sqrt{s} =1.96 TeV
6 pages, 3 figures, published in Phys. Rev. Lett
Phys.Rev.Lett.100:241803,2008
10.1103/PhysRevLett.100.241803
Fermilab-Pub-07-620E
hep-ex
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We report a search for R-parity violating production and decay of sneutrino particles in the e+mu final state with 1.04+-0.06 fb-1 of data collected with the D0 detector at the Fermilab Tevatron Collider in 2002--2006. Good agreement between the data and the standard model prediction is observed. With no evidence for new physics, we set limits on the R-parity violating couplings $\lambda^{\prime}_{311}$ and $\lambda_{312}$ as a function of sneutrino mass.
[ { "version": "v1", "created": "Tue, 20 Nov 2007 21:04:02 GMT" }, { "version": "v2", "created": "Mon, 31 Dec 2007 17:38:46 GMT" }, { "version": "v3", "created": "Fri, 20 Jun 2008 04:39:06 GMT" } ]
2008-11-26T00:00:00
[ [ "D0 Collaboration", "", "" ], [ "Abazov", "V. M", "" ] ]
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