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801.0873
Alan Stapledon
Alan Stapledon
Inequalities and Ehrhart $\delta$-Vectors
11 pages. v2: minor changes, more detailed proof of Lemma 2.12. To appear in Trans. Amer. Math. Soc
Trans. Amer. Math. Soc. 361 (2009), 5615-5626.
null
null
math.CO
null
For any lattice polytope $P$, we consider an associated polynomial $\bar{\delta}_{P}(t)$ and describe its decomposition into a sum of two polynomials satisfying certain symmetry conditions. As a consequence, we improve upon known inequalities satisfied by the coefficients of the Ehrhart $\delta$-vector of a lattice polytope. We also provide combinatorial proofs of two results of Stanley that were previously established using techniques from commutative algebra. Finally, we give a necessary numerical criterion for the existence of a regular unimodular lattice triangulation of the boundary of a lattice polytope.
[ { "version": "v1", "created": "Sun, 6 Jan 2008 16:50:40 GMT" }, { "version": "v2", "created": "Sat, 23 Feb 2008 19:20:39 GMT" } ]
2009-09-24T00:00:00
[ [ "Stapledon", "Alan", "" ] ]
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801.0874
Rosa Orellana
Andrew Mathas and Rosa C. Orellana
Cyclotomic Solomon Algebras
null
null
null
null
math.CO math.RA math.RT
null
This paper introduces an analogue of the Solomon descent algebra for the complex reflection groups of type $G(r,1,n)$. As with the Solomon descent algebra, our algebra has a basis given by sums of `distinguished' coset representatives for certain `reflection subgroups'. We explicitly describe the structure constants with respect to this basis and show that they are polynomials in $r$. This allows us to define a deformation, or $q$-analogue, of these algebras which depends on a parameter $q$. We determine the irreducible representations of all of these algebras and give a basis for their radicals. Finally, we show that the direct sum of cyclotomic Solomon algebras is canonically isomorphic to a concatenation Hopf algebra.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 14:34:01 GMT" }, { "version": "v2", "created": "Fri, 9 May 2008 15:29:35 GMT" } ]
2008-05-09T00:00:00
[ [ "Mathas", "Andrew", "" ], [ "Orellana", "Rosa C.", "" ] ]
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801.0875
David M. Fisher
David Fisher and Lior Silberman
Groups not acting on manifolds
References added, minor changes
null
null
null
math.DS math.DG math.GR
null
In this article we collect a series of observations that constrain actions of many groups on compact manifolds. In particular, we show that "generic" finitely generated groups have no smooth volume preserving actions on compact manifolds while also producing many finitely presented, torsion free groups with the same property.
[ { "version": "v1", "created": "Sun, 6 Jan 2008 16:55:28 GMT" }, { "version": "v2", "created": "Sat, 26 Jan 2008 20:43:07 GMT" }, { "version": "v3", "created": "Thu, 15 May 2008 00:37:44 GMT" } ]
2008-05-15T00:00:00
[ [ "Fisher", "David", "" ], [ "Silberman", "Lior", "" ] ]
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801.0876
Mensur Omerbashich
M. Omerbashich
Scale invariability
7 pages, 1 figure. Expanded
null
null
null
physics.gen-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
I recently demonstrated that the Earth is a mechanical oscillator in which springtide induced magnification of all-masses resonance forces tectonics. I here generalize this georesonator concept so to make it apply to any body, anywhere in all the universes, and at all times. It turns out that there is no distinction between physics at intergalactic, mechanist, quantum, and smaller scales. Instead of being a constant (of proportionality of physics at all scales), G is a parameter of most general form: G = s e^2, nonlinearly varying amongst different scales s. The so called scale variability of physics but not of G, imagined as such by Planck and Einstein, is due to springtide-induced extreme resonance of Earth masses critically impeding terrestrial experiments for estimating G, while providing artificial settings for quantum experiments to all trivially "work". Thus the derived equation is that of levitation. Reality is a system of near infinitely many magnifying oscillators, where permanent energy decay of all oscillation forbids constancy of known "physical constants". This hyperresonator concept explains the magnetism (as every forced oscillator feature), as well as the gravitation (as forward propagation of mechanical vibrations along the aether i.e. throughout the vacuum structure). To test my claim I propose a Space mission to collect on site measurements of eigenperiods of the Sun, its planets, and their satellites. The levitation equitation enables propulsionless Space travel via gravity sailing: Space vehicle hull ought to be engineered so as to automatically adjust its grave mode, to the vehicle instant gravitational surroundings, akin to trout up swimming.
[ { "version": "v1", "created": "Sun, 6 Jan 2008 17:20:57 GMT" }, { "version": "v2", "created": "Tue, 9 Feb 2010 01:15:07 GMT" } ]
2010-02-09T00:00:00
[ [ "Omerbashich", "M.", "" ] ]
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801.0877
Arnd Meyer
D0 Collaboration, V. Abazov, et al
Search for excited electrons in ppbar collisions at sqrt(s) = 1.96 TeV
8 pages, 5 figures, submitted to Phys.Rev.D Rap.Comm
Phys.Rev.D77:091102,2008
10.1103/PhysRevD.77.091102
Fermilab-Pub-08-007-E
hep-ex
null
We present the results of a search for the production of an excited state of the electron, e*, in proton-antiproton collisions at sqrt(s) = 1.96 TeV. The data were collected with the D0 experiment at the Fermilab Tevatron Collider and correspond to an integrated luminosity of approximately 1 fb^-1. We search for e* in the process ppbar -> e* e, with the e* subsequently decaying to an electron plus photon. No excess above the standard model background is observed. Interpreting our data in the context of a model that describes e* production by four-fermion contact interactions and e* decay via electroweak processes, we set 95% C.L. upper limits on the production cross section ranging from 8.9 fb to 27 fb, depending on the mass of the excited electron. Choosing the scale for contact interactions to be Lambda = 1 TeV, excited electron masses below 756 GeV are excluded at the 95% C.L.
[ { "version": "v1", "created": "Sun, 6 Jan 2008 17:28:04 GMT" } ]
2008-11-26T00:00:00
[ [ "D0 Collaboration", "", "" ], [ "Abazov", "V.", "" ] ]
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801.0878
Mitesh Patel Mr
M. Patel, R.D. Oudmaijer, J.S. Vink, J.E. Bjorkman, B. Davies, M.A.T. Groenewegen, A.S. Miroshnichenko, J. C. Mottram
Spectropolarimetry of the Massive Post-Red Supergiants IRC +10420 and HD 179821
13 pages, 6 figures, MNRAS accepted
null
10.1111/j.1365-2966.2008.12889.x
null
astro-ph
null
We present medium resolution spectropolarimetry and long term photo-polarimetry of two massive post-red supergiants, IRC +10420 and HD 179821. The data provide new information on their circumstellar material as well as their evolution. In IRC +10420, the polarization of the Halpha line is different to that of the continuum, which indicates that the electron-scattering region is not spherically symmetric. The observed long term changes in the polarimetry can be associated with an axi-symmetric structure, along the short axis of the extended reflection nebulosity. Long term photometry reveals that the star increased in temperature until the mid-nineties, after which the photospheric flux in the optical levelled off. As the photometric changes are mostly probed in the red, they do not trace high stellar temperatures sensitively. And so, it is not obvious whether the star has halted its increase in temperature or not. For HD 179821 we find no polarization effects across any absorption or emission lines, but observe very large polarization changes of order 5% over 15 years. Unexpectedly, during the same period, the optical photometry displayed modest variability at the 0.2 magnitude level. Several explanations for this puzzling fact are discussed. Most of which, involving asymmetries in the circumstellar material, seem to fail as there is no evidence for the presence of hot, dusty material close to the star. Alternatively, the variations can be explained by the presence of a non-radially pulsating photosphere. Changes in the photometry hint at an increase in temperature corresponding to a change through two spectral subclasses over the past ten years.
[ { "version": "v1", "created": "Sun, 6 Jan 2008 17:44:44 GMT" } ]
2009-11-13T00:00:00
[ [ "Patel", "M.", "" ], [ "Oudmaijer", "R. D.", "" ], [ "Vink", "J. S.", "" ], [ "Bjorkman", "J. E.", "" ], [ "Davies", "B.", "" ], [ "Groenewegen", "M. A. T.", "" ], [ "Miroshnichenko", "A. S.", "" ], [ "Mottram", "J. C.", "" ] ]
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801.0879
Francesca Sammarruca
Francesca Sammarruca
Predicting the Lambda binding energy in nuclear matter
LaTeX, 8 pages
null
null
null
nucl-th
null
The purpose of this note is to report predictions of the binding energy of the $\Lambda$ hyperon in nuclear matter using the latest version of the Juelich nucleon-nucleon meson-exchange potential. Results from a conventional Brueckner calculation are compared with previously reported values. A calculation including Dirac effects on the $\Lambda$ single-particle potential is also presented. Issues encountered in Dirac calculations with nucleon-hyperon potentials are discussed.
[ { "version": "v1", "created": "Sun, 6 Jan 2008 17:42:13 GMT" } ]
2008-01-08T00:00:00
[ [ "Sammarruca", "Francesca", "" ] ]
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801.088
Dipanjan Basu
D. Basu, M. J. Gilbert, L. F. Register and S. K. Banerjee
An Efficient Method for Quantum Transport Calculations in Nanostructures using Full Band Structure
Additional simulations are being carried on to add to the results section, mainly to investigate band-to-band tunneling in low band gap semiconductors. The pre-print draft is however, complete from the perspective of the quantum transport method that we illustrate
null
null
null
cond-mat.mes-hall cond-mat.mtrl-sci
null
Scaling of semiconductor devices has reached a stage where it has become absolutely imperative to consider the quantum mechanical aspects of transport in these ultra small devices. In these simulations, often one excludes a rigorous band structure treatment, since it poses a huge computational challenge. We have proposed here an efficient method for calculating full three-dimensionally coupled quantum transport in nanowire transistors including full band structure. We have shown the power of the method by simulating hole transport in p-type Ge nanowire transistors. The hole band structure obtained from our nearest neighbor sp3s* tight binding Hamiltonian agrees well qualitatively with more complex and accurate calculations that take third nearest neighbors into account. The calculated I-V results show how shifting of the energy bands due to confinement can be accurately captured only in a full band full quantum simulation.
[ { "version": "v1", "created": "Sun, 6 Jan 2008 17:50:19 GMT" } ]
2008-01-08T00:00:00
[ [ "Basu", "D.", "" ], [ "Gilbert", "M. J.", "" ], [ "Register", "L. F.", "" ], [ "Banerjee", "S. K.", "" ] ]
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801.0881
Maria Chekhova Dr
I. N. Agafonov, M. V. Chekhova, T. Sh. Iskhakov, A. N. Penin
High-visibility multi-photon interference of Hanbury Brown - Twiss type for classical light
11 pages, 9 figures
null
10.1103/PhysRevA.77.053801
null
quant-ph
null
Difference-phase (or Hanbury Brown - Twiss type) intensity interference of classical light is considered in higher orders in the intensity. It is shown that, while the visibility of sum-phase (NOON-type) interference for classical sources drops with the order of interference, the visibility of difference-phase interference has opposite behavior. For three-photon and four-photon interference of two coherent sources, the visibility can be as high as 81.8% and 94.4%, respectively. High-visibility three-photon and four-photon interference of space-time and polarization types has been observed in experiment, for both coherent and pseudo-thermal light.
[ { "version": "v1", "created": "Sun, 6 Jan 2008 18:05:17 GMT" } ]
2009-11-13T00:00:00
[ [ "Agafonov", "I. N.", "" ], [ "Chekhova", "M. V.", "" ], [ "Iskhakov", "T. Sh.", "" ], [ "Penin", "A. N.", "" ] ]
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801.0882
Nina Bohr
Neil D. Jones and Nina Bohr
Call-by-value Termination in the Untyped lambda-calculus
null
Logical Methods in Computer Science, Volume 4, Issue 1 (March 17, 2008) lmcs:915
10.2168/LMCS-4(1:3)2008
null
cs.PL
null
A fully-automated algorithm is developed able to show that evaluation of a given untyped lambda-expression will terminate under CBV (call-by-value). The ``size-change principle'' from first-order programs is extended to arbitrary untyped lambda-expressions in two steps. The first step suffices to show CBV termination of a single, stand-alone lambda;-expression. The second suffices to show CBV termination of any member of a regular set of lambda-expressions, defined by a tree grammar. (A simple example is a minimum function, when applied to arbitrary Church numerals.) The algorithm is sound and proven so in this paper. The Halting Problem's undecidability implies that any sound algorithm is necessarily incomplete: some lambda-expressions may in fact terminate under CBV evaluation, but not be recognised as terminating. The intensional power of the termination algorithm is reasonably high. It certifies as terminating many interesting and useful general recursive algorithms including programs with mutual recursion and parameter exchanges, and Colson's ``minimum'' algorithm. Further, our type-free approach allows use of the Y combinator, and so can identify as terminating a substantial subset of PCF.
[ { "version": "v1", "created": "Sun, 6 Jan 2008 19:01:02 GMT" }, { "version": "v2", "created": "Mon, 17 Mar 2008 12:55:44 GMT" } ]
2015-07-01T00:00:00
[ [ "Jones", "Neil D.", "" ], [ "Bohr", "Nina", "" ] ]
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801.0883
James D. Meiss
J.D. Meiss
Visual Explorations of Dynamics: the Standard Map
Corrections in a couple of equations, and updated to the latest version of StdMap
Pramana, Indian Academy of Sciences 70: 965-988 (2008)
10.1007/s12043-008-0103-3
null
nlin.CD
null
The Macintosh application \textit{StdMap} allows easy exploration of many of the phenomena of area-preserving mappings. This tutorial explains some of these phenomena and presents a number of simple experiments centered on the use of this program.
[ { "version": "v1", "created": "Sun, 6 Jan 2008 18:39:23 GMT" }, { "version": "v2", "created": "Mon, 12 May 2008 22:05:07 GMT" } ]
2010-02-19T00:00:00
[ [ "Meiss", "J. D.", "" ] ]
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801.0884
Vivek Rane V
Vivek V. Rane
Instant Evaluation and Demystification of $\zeta(n),L(n,\chi)$ that Euler,Ramanujan Missed - I
19 pages
null
null
null
math.NT
null
For Hurwitz Zeta function,we consider its Taylor series expansion about various points as an analytic function of second variable in appropriate discs.We show that these Taylor are all polynomials in second variable for a non positive integral argument in first variable.On using functionalequations this results in instant evaluation of Riemann Zeta function at positive even integral values of its argument and of Dirichlet L series at positive integral values of its argument,when the argument and the corresponding Dirichlet character are both even or both odd.We also obtain finite sum expression for any Dirichlet L series,when its argument is one.We also deal with Lerch's Zeta function on similar lines.
[ { "version": "v1", "created": "Sun, 6 Jan 2008 18:48:54 GMT" } ]
2008-01-08T00:00:00
[ [ "Rane", "Vivek V.", "" ] ]
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801.0885
Yury Eroshenko
V.I. Dokuchaev, Yu.N. Eroshenko, S.G. Rubin
Early formation of galaxies initiated by clusters of primordial black holes
13 pages, 5 figures, accepted for publication in Astron. Rep. (Astronomicheskii Zhurnal)
Astron.Rep.52:779-789,2008
10.1134/S1063772908100016
null
astro-ph
null
Model of supermassive black holes formation inside the clusters of primordial black holes is developed. Namely, it is supposed, that some mass fraction of the universe ~10^-3 is composed of the compact clusters of primordial (relic) black holes, produced during phase transitions in the early universe. These clusters are the centers of dark matter condensation. We model the formation of protogalaxies with masses about 2*10^8M_sun at the redshift z=15. These induced protogalaxies contain central black holes with mass ~10^5M_sun and look like dwarf spheroidal galaxies with central density spike. The subsequent merging of induced protogalaxies and ordinary dark matter haloes corresponds to the standard hierarchical clustering scenario of large-scale structure formation. The coalescence of primordial black holes results in formation of supermassive black holes in the galactic centers. As a result, the observed correlation between the masses of central black holes and velocity dispersion in the galactic bulges is reproduced.
[ { "version": "v1", "created": "Sun, 6 Jan 2008 19:01:34 GMT" } ]
2009-11-13T00:00:00
[ [ "Dokuchaev", "V. I.", "" ], [ "Eroshenko", "Yu. N.", "" ], [ "Rubin", "S. G.", "" ] ]
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801.0886
Andrew Rushforth
A.W. Rushforth, E. De Ranieri, J. Zemen, J. Wunderlich, K.W. Edmonds, C.S. King, E. Ahmad, R.P. Campion, C.T. Foxon, B.L. Gallagher, K. Vyborny, J. Kucera, T. Jungwirth
Voltage control of magnetocrystalline anisotropy in ferromagnetic - semiconductor/piezoelectric hybrid structures
Submitted to Physical Review Letters. Updates version 1 to include a more detailed discussion of the effect of strain on the anisotropic magnetoresistance
Physical Review B 78, 085314 (2008)
10.1103/PhysRevB.78.085314
null
cond-mat.mtrl-sci cond-mat.mes-hall
null
We demonstrate dynamic voltage control of the magnetic anisotropy of a (Ga,Mn)As device bonded to a piezoelectric transducer. The application of a uniaxial strain leads to a large reorientation of the magnetic easy axis which is detected by measuring longitudinal and transverse anisotropic magnetoresistance coefficients. Calculations based on the mean-field kinetic-exchange model of (Ga,Mn)As provide microscopic understanding of the measured effect. Electrically induced magnetization switching and detection of unconventional crystalline components of the anisotropic magnetoresistance are presented, illustrating the generic utility of the piezo voltage control to provide new device functionalities and in the research of micromagnetic and magnetotransport phenomena in diluted magnetic semiconductors.
[ { "version": "v1", "created": "Sun, 6 Jan 2008 19:19:35 GMT" }, { "version": "v2", "created": "Tue, 22 Jan 2008 14:25:18 GMT" } ]
2009-11-13T00:00:00
[ [ "Rushforth", "A. W.", "" ], [ "De Ranieri", "E.", "" ], [ "Zemen", "J.", "" ], [ "Wunderlich", "J.", "" ], [ "Edmonds", "K. W.", "" ], [ "King", "C. S.", "" ], [ "Ahmad", "E.", "" ], [ "Campion", "R. P.", "" ], [ "Foxon", "C. T.", "" ], [ "Gallagher", "B. L.", "" ], [ "Vyborny", "K.", "" ], [ "Kucera", "J.", "" ], [ "Jungwirth", "T.", "" ] ]
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801.0887
Ignazio Licata
Ignazio Licata
A Dynamical Model for Information Retrieval and Emergence of Scale-Free Clusters in a Long Term Memory Network
8 pages, 11 figures, 2 tables. Submitted to Emergence: Complexity and Organization
null
null
null
physics.gen-ph nlin.AO
null
The classical forms of knowledge representation fail when a strong dynamical interconnection between system and environment comes into play. We propose here a model of information retrieval derived from the Kintsch-Ericsson scheme, based upon a long term memory (LTM) associative net whose structure changes in time according to the textual content of the analyzed documents. Both the theoretical analysis carried out by using simple statistical tools and the tests show the appearing of typical power-laws and the net configuration as a scale-free graph. The information retrieval from LTM shows that the entire system can be considered to be an information amplifier which leads to the emergence of new cognitive structures. It has to be underlined that the expanding of the semantic domain regards the user-network as a whole system.
[ { "version": "v1", "created": "Sun, 6 Jan 2008 19:31:10 GMT" } ]
2010-04-26T00:00:00
[ [ "Licata", "Ignazio", "" ] ]
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801.0888
Congjun Wu
Congjun Wu
Orbital ordering and frustration of $p$-band Mott-insulators
accepted by Phys. Rev. Lett
Phys. Rev. Lett. 100, 200406 (2008)
10.1103/PhysRevLett.100.200406
null
cond-mat.str-el cond-mat.stat-mech
null
We investigate the general structure of orbital exchange physics in Mott-insulating states of $p$-orbital systems in optical lattices. Orbital orders occur in both the triangular and Kagome lattices. In contrast, orbital exchange in the honeycomb lattice is frustrated as described by a novel quantum 120$^\circ$-model. Its classical ground states are mapped into configurations of the fully-packed loop model with an extra U(1) rotation degree of freedom. Quantum orbital fluctuations select a six-site plaquette ground state ordering pattern in the semiclassical limit from the ``order from disorder'' mechanism. This effect arises from the appearance of a zero energy flat-band of orbital excitations.
[ { "version": "v1", "created": "Sun, 6 Jan 2008 20:38:11 GMT" }, { "version": "v2", "created": "Wed, 9 Jan 2008 19:04:49 GMT" }, { "version": "v3", "created": "Sun, 2 Mar 2008 22:54:39 GMT" }, { "version": "v4", "created": "Wed, 30 Apr 2008 04:21:07 GMT" } ]
2008-06-07T00:00:00
[ [ "Wu", "Congjun", "" ] ]
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801.0889
Kirill Bronnikov
K.A. Bronnikov, O.B. Zaslavskii
Black holes can have curly hair
5 pages, no figures. Some discussion added, misprints corrected
Phys.Rev.D78:021501,2008
10.1103/PhysRevD.78.021501
null
gr-qc astro-ph hep-th
null
We study equilibrium conditions between a static, spherically symmetric black hole and classical matter in terms of the radial pressure to density ratio p_r/\rho = w(u), where u is the radial coordinate. It is shown that such an equilibrium is possible in two cases: (i) the well-known case w\to -1 as $u\to u_h (the horizon), i.e., "vacuum" matter, for which \rho(u_h) can be nonzero; (ii) w \to -1/(1+2k) and \rho \sim (u-u_h)^k as u\to u_h, where k>0 is a positive integer (w=-1/3 in the generic case k=1). A non-interacting mixture of these two kinds of matter can also exist. The whole reasoning is local, hence the results do not depend on any global or asymptotic conditions. They mean, in particular, that a static black hole cannot live inside a star with nonnegative pressure and density. As an example, an exact solution for an isotropic fluid with w = -1/3 (that is, a fluid of disordered cosmic strings), with or without vacuum matter, is presented.
[ { "version": "v1", "created": "Sun, 6 Jan 2008 21:43:27 GMT" }, { "version": "v2", "created": "Thu, 29 May 2008 19:58:24 GMT" } ]
2008-11-26T00:00:00
[ [ "Bronnikov", "K. A.", "" ], [ "Zaslavskii", "O. B.", "" ] ]
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801.089
Jose Carlos Bermejo-Barrera
Jose Carlos Bermejo-Barrera
A Narration is Not an Equation: Metaphysical Principals of Standard Cosmology
30 pages
null
null
null
physics.gen-ph
null
In this paper the author maintains that the Standard Cosmology is not a Physical Theory. The Standard Cosmology is a narration similar to the historical or mythical narratives constructed from the Physical Sciences data. Also the author maintains that this theory is founded on Philosophical principles which are aliens to the Physical Theory, as the Principle of Sufficient Reason. The author porpoise a new cosmological model based more on eventuality than in necessity.
[ { "version": "v1", "created": "Sun, 6 Jan 2008 21:57:53 GMT" } ]
2008-01-08T00:00:00
[ [ "Bermejo-Barrera", "Jose Carlos", "" ] ]
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801.0891
David Broadhurst
David H. Bailey, Jonathan M. Borwein, David Broadhurst and M. L. Glasser
Elliptic integral evaluations of Bessel moments
51 pages, 1 Postscript figure, uses amsmath.sty, added references
J. Phys. A: Math. Theor. 41 (2008) 205203
10.1088/1751-8113/41/20/205203
null
hep-th hep-ph math-ph math.MP
null
We record what is known about the closed forms for various Bessel function moments arising in quantum field theory, condensed matter theory and other parts of mathematical physics. More generally, we develop formulae for integrals of products of six or fewer Bessel functions. In consequence, we are able to discover and prove closed forms for $c_{n,k}:=\int_0^\infty t^k K_0^n(t) {\rm d}t$ with integers $n=1,2,3,4$ and $k\ge0$, obtaining new results for the even moments $c_{3,2k}$ and $c_{4,2k}$. We also derive new closed forms for the odd moments $s_{n,2k+1}:=\int_0^\infty t^{2k+1}I_0^{}(t) K_0^{n-1}(t) {\rm d}t$ with $n=3,4$ and for $t_{n,2k+1}:=\int_0^\infty t^{2k+1}I_0^2(t) K_0^{n-2}(t) {\rm d}t$ with $n=5$, relating the latter to Green functions on hexagonal, diamond and cubic lattices. We conjecture the values of $s_{5,2k+1}$, make substantial progress on the evaluation of $c_{5,2k+1}$, $s_{6,2k+1}$ and $t_{6,2k+1}$ and report more limited progress regarding $c_{5,2k}$, $c_{6,2k+1}$ and $c_{6,2k}$. In the process, we obtain 8 conjectural evaluations, each of which has been checked to 1200 decimal places. One of these lies deep in 4- dimensional quantum field theory and two are probably provable by delicate combinatorics. There remains a hard core of five conjectures whose proofs would be most instructive, to mathematicians and physicists alike.
[ { "version": "v1", "created": "Sun, 6 Jan 2008 22:15:49 GMT" }, { "version": "v2", "created": "Fri, 8 Feb 2008 01:17:55 GMT" } ]
2008-04-29T00:00:00
[ [ "Bailey", "David H.", "" ], [ "Borwein", "Jonathan M.", "" ], [ "Broadhurst", "David", "" ], [ "Glasser", "M. L.", "" ] ]
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801.0892
A. Lewis Licht
A. Lewis Licht
Gauge Fields and Unparticles
7 pages v2: Typographical error in Eq. (30) corrected
null
null
null
hep-th
null
We show that a rigorous path integral method of introducing gauge fields in the UnParticle lagrangian leads to somewhat different and more complicated vertexes than those currently used.
[ { "version": "v1", "created": "Sun, 6 Jan 2008 23:52:14 GMT" }, { "version": "v2", "created": "Sun, 3 Feb 2008 23:13:09 GMT" } ]
2008-02-04T00:00:00
[ [ "Licht", "A. Lewis", "" ] ]
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801.0893
Gwen Rudie
G. C. Rudie, R. A. Fesen, and T. Yamada
The Crab Nebula's Dynamical Age as Measured from its Northern Filamentary Jet
8 pages, 5 figures, Accepted to MNRAS
null
10.1111/j.1365-2966.2007.12799.x
null
astro-ph
null
We present a deep [O III] 4959,5007 image of the northern filamentary jet in the Crab Nebula taken with the 8.2m Subaru telescope. Using this image and an image taken with the KPNO 4m in 1988 (Fesen & Staker 1993), we have computed proper motions for 35 locations in the jet. The results suggest that when compared to the main body of the remnant, the jet experienced less outward acceleration from the central pulsar's rapidly expanding synchrotron nebula. The jet's apparent expansion rate yields an undecelerated explosion date for the Crab Nebula of 1055 plus or minus 24 C.E., a date much closer to the appearance of the historic 1054 C.E. guest star than the 1120 - 1140 C.E. dates estimated in previous studies using filaments located within the remnant's main nebula. Our proper motion measurements suggest the jet likely formed during the 1054 supernova explosion and represents the remnant's highest velocity knots possibly associated with a suspected N-S bipolar outflow from the supernova explosion.
[ { "version": "v1", "created": "Sun, 6 Jan 2008 23:58:57 GMT" } ]
2009-11-13T00:00:00
[ [ "Rudie", "G. C.", "" ], [ "Fesen", "R. A.", "" ], [ "Yamada", "T.", "" ] ]
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801.0894
EDA Publishing Association
C. S. Yu, W. C. Wei, S. W. Kang
Investigation of Micro Porosity Sintered wick in Vapor Chamber for Fan Less Design
Submitted on behalf of TIMA Editions (http://irevues.inist.fr/tima-editions)
Dans 13th International Worshop on THERMal INvestigations of ICs and Systems - THERMINIC 2007, Budapest : Hongrie (2007)
null
null
physics.gen-ph
null
Micro Porosity Sintered wick is made from metal injection molding processes, which provides a wick density with micro scale. It can keep more than 53 % working fluid inside the wick structure, and presents good pumping ability on working fluid transmission by fine infiltrated effect. Capillary pumping ability is the important factor in heat pipe design, and those general applications on wick structure are manufactured with groove type or screen type. Gravity affects capillary of these two types more than a sintered wick structure does, and mass heat transfer through vaporized working fluid determines the thermal performance of a vapor chamber. First of all, high density of porous wick supports high transmission ability of working fluid. The wick porosity is sintered in micro scale, which limits the bubble size while working fluid vaporizing on vapor section. Maximum heat transfer capacity increases dramatically as thermal resistance of wick decreases. This study on permeability design of wick structure is 0.5 - 0.7, especially permeability (R) = 0.5 can have the best performance, and its heat conductivity is 20 times to a heat pipe with diameter (Phi) = 10mm. Test data of this vapor chamber shows thermal performance increases over 33 %.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 16:41:09 GMT" } ]
2008-01-08T00:00:00
[ [ "Yu", "C. S.", "" ], [ "Wei", "W. C.", "" ], [ "Kang", "S. W.", "" ] ]
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801.0895
Yeo Woong Yoon
Chuan-Hung Chen, C. S. Kim, Yeo Woong Yoon
Investigation of $B_{u,d}\to (\pi, K) \pi$ decays within unparticle physics
Analysis on mixing part is revised
Phys.Lett.B671:250-255,2009
10.1016/j.physletb.2008.12.007
null
hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We investigate the implication of unparticle physics on the B_{u,d}\to (\pi, K) \pi decays under the constraints of the B_{d,s}-\bar B_{d,s} mixing. We found that not only the unparticle parameters that belong to the flavor changing neutral current (FCNC) processes but also scaling dimension d_{\UP} could be constrained by the B_{d,s}-\bar B_{d,s} mixing phenomenology. Employing the minimum \chi^2 analysis to the B_{u,d}\to (\pi, K) \pi decays with the constraints of B_{d,s} mixing, we find that the puzzle of large branching ratio for B_{d}\to \pi^0 \pi^0 and the discrepancy between the standard model estimation and data for the direct CP asymmetry of B^+ \to K^+ \pi^0 and B_d \to \pi^+\pi^- can be resolved well. However, the mixing induced CP asymmetry of B_d\to K_S \pi^0 could not be well accommodated by the unparticle contributions.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 01:07:18 GMT" }, { "version": "v2", "created": "Fri, 18 Jan 2008 08:44:29 GMT" }, { "version": "v3", "created": "Mon, 15 Dec 2008 00:25:14 GMT" } ]
2009-01-14T00:00:00
[ [ "Chen", "Chuan-Hung", "" ], [ "Kim", "C. S.", "" ], [ "Yoon", "Yeo Woong", "" ] ]
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801.0896
Bobby Eka Gunara
Bobby E. Gunara and Freddy P. Zen (ITB and ICTMP)
Deformation of Curved BPS Domain Walls and Supersymmetric Flows on 2d K\"ahler-Ricci Soliton
19 pages, no figures. Typos corrected. Published version
Commun.Math.Phys.287:849-866,2009
10.1007/s00220-009-0744-1
null
hep-th math-ph math.DG math.DS math.MP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider some aspects of the curved BPS domain walls and their supersymmetric Lorentz invariant vacua of the four dimensional N=1 supergravity coupled to a chiral multiplet. In particular, the scalar manifold can be viewed as a two dimensional K\"ahler-Ricci soliton generating a one-parameter family of K\"ahler manifolds evolved with respect to a real parameter, $\tau$. This implies that all quantities describing the walls and their vacua indeed evolve with respect to $\tau$. Then, the analysis on the eigenvalues of the first order expansion of BPS equations shows that in general the vacua related to the field theory on a curved background do not always exist. In order to verify their existence in the ultraviolet or infrared regions one has to perform the renormalization group analysis. Finally, we discuss in detail a simple model with a linear superpotential and the K\"ahler-Ricci soliton considered as the Rosenau solution.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 01:56:47 GMT" }, { "version": "v2", "created": "Wed, 19 Mar 2008 04:28:42 GMT" }, { "version": "v3", "created": "Sat, 29 Nov 2008 15:12:20 GMT" }, { "version": "v4", "created": "Fri, 13 Mar 2009 10:28:39 GMT" } ]
2009-03-24T00:00:00
[ [ "Gunara", "Bobby E.", "", "ITB and ICTMP" ], [ "Zen", "Freddy P.", "", "ITB and ICTMP" ] ]
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801.0897
Jordan Bell
Leonhard Euler
A more accurate treatment of the problem of drawing the shortest line on a surface
10 pages; E727 in the Enestrom index
null
null
null
math.HO math.CA
null
E727 in the Enestrom index. This is a translation from the Latin original "Accuratior evolutio problematis de linea brevissima in superficie quacunque ducenda" (1779). Given a surface $pdx+qdy+rdz=0$, Euler wants to develop equations that give the geodesics on this surface. I am new to the calculus of variations, so it is not clear to me what steps follow from results that are previously known (like the Euler-Lagrange equation in the calculations) and what steps follow from earlier in this paper. I would appreciate comments from any readers who are familiar with calculus of variations.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 02:31:23 GMT" } ]
2008-01-08T00:00:00
[ [ "Euler", "Leonhard", "" ] ]
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801.0898
Juan Carlos Martinez Oliveros JCMO
J.C. Martinez-Oliveros, H. Moradi, A-C. Donea
Seismic Emissions from a Highly Impulsive M6.7 Solar Flare
16 pages, 7 figures, Solar Physics Topical Issue: SOHO 19/GONG 2007 "Seismology of Magnetic Activity", Accepted
null
10.1007/s11207-008-9122-y
null
astro-ph
null
On 10 March 2001 the active region NOAA 9368 produced an unusually impulsive solar flare in close proximity to the solar limb. This flare has previously been studied in great detail, with observations classifying it as a type 1 white-light flare with a very hard spectrum in hard X-rays. The flare was also associated with a type II radio burst and coronal mass ejection. The flare emission characteristics appeared to closely correspond with previous instances of seismic emission from acoustically active flares. Using standard local helioseismic methods, we identified the seismic signatures produced by the flare that, to date, is the least energetic (in soft X-rays) of the flares known to have generated a detectable acoustic transient. Holographic analysis of the flare shows a compact acoustic source strongly correlated with the impulsive hard X-ray, visible continuum, and radio emission. Time-distance diagrams of the seismic waves emanating from the flare region also show faint signatures, mainly in the eastern sector of the active region. The strong spatial coincidence between the seismic source and the impulsive visible continuum emission reinforces the theory that a substantial component of the seismic emission seen is a result of sudden heating of the low photosphere associated with the observed visible continuum emission. Furthermore, the low-altitude magnetic loop structure inferred from potential--field extrapolations in the flaring region suggests that there is a significant inverse correlation between the seismicity of a flare and the height of the magnetic loops that conduct the particle beams from the corona.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 03:01:30 GMT" }, { "version": "v2", "created": "Wed, 9 Jan 2008 05:08:13 GMT" } ]
2009-11-13T00:00:00
[ [ "Martinez-Oliveros", "J. C.", "" ], [ "Moradi", "H.", "" ], [ "Donea", "A-C.", "" ] ]
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801.0899
EDA Publishing Association
F. Stefani, P.E. Bagnoli, S. Luschi
Study of Water Speed Sensitivity in a Multifunctional Thick-film Sensor by Analytical Thermal Simulations and Experiments
Submitted on behalf of TIMA Editions (http://irevues.inist.fr/tima-editions)
Dans 13th International Worshop on THERMal INvestigations of ICs and Systems - THERMINIC 2007, Budapest : Hongrie (2007)
null
null
physics.gen-ph
null
The present paper deals with an application of the analytical thermal simulator DJOSER. It consist of the characterization of a water speed sensor realized in hybrid technology. The capability of the thermal solver to manage the convection heat exchange and the effects of the passivating layers make the simulation work easy and fast.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 16:40:35 GMT" } ]
2008-01-08T00:00:00
[ [ "Stefani", "F.", "" ], [ "Bagnoli", "P. E.", "" ], [ "Luschi", "S.", "" ] ]
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801.09
Chad Galley
Chad R. Galley and B. L. Hu
Self-force on extreme mass ratio inspirals via curved spacetime effective field theory
22 pages, 5 figures; references added, revised Appendices B & C, corrected typos, revisions throughout for clarification particularly in Section IV.B; submitted to PRD
Phys.Rev.D79:064002,2009
10.1103/PhysRevD.79.064002
null
gr-qc astro-ph hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this series we construct an effective field theory (EFT) in curved spacetime to study gravitational radiation and backreaction effects. We begin in this paper with a derivation of the self-force on a compact object moving in the background spacetime of a supermassive black hole. The EFT approach utilizes the disparity between two length scales, which in this problem are the size of the compact object and the radius of curvature of the background spacetime, to treat the orbital dynamics of the compact object, described as an effective point particle, separately from its tidal deformations. Ultraviolet divergences are regularized using Hadamard's {\it partie finie} to isolate the non-local finite part from the quasi-local divergent part. The latter is constructed from a momentum space representation for the graviton retarded propagator and is evaluated using dimensional regularization in which only logarithmic divergences are relevant for renormalizing the parameters of the theory. As a first important application of this framework we explicitly derive the first order self-force given by Mino, Sasaki, Tanaka, Quinn and Wald. Going beyond the point particle approximation, to account for the finite size of the object, we demonstrate that for extreme mass ratio inspirals the motion of a compact object is affected by tidally induced moments at $O(\epsilon^4)$, in the form of an Effacement Principle. The relatively large radius-to-mass ratio of a white dwarf star allows for these effects to be enhanced until the white dwarf becomes tidally disrupted, a potentially $O(\epsilon^2)$ process, or plunges into the supermassive black hole. This work provides a new foundation for further exploration of higher order self force corrections, gravitational radiation and spinning compact objects.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 04:39:26 GMT" }, { "version": "v2", "created": "Thu, 5 Jun 2008 15:10:49 GMT" } ]
2009-03-12T00:00:00
[ [ "Galley", "Chad R.", "" ], [ "Hu", "B. L.", "" ] ]
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801.0901
Taylor Hughes
Markus Koenig, Hartmut Buhmann, Laurens W. Molenkamp, Taylor L. Hughes, Chao-Xing Liu, Xiao-Liang Qi and Shou-Cheng Zhang
The Quantum Spin Hall Effect: Theory and Experiment
Invited review article for special issue of JPSJ, 32 pages. For higher resolution figures see official online version when published
null
10.1143/JPSJ.77.031007
null
cond-mat.mes-hall
null
The search for topologically non-trivial states of matter has become an important goal for condensed matter physics. Recently, a new class of topological insulators has been proposed. These topological insulators have an insulating gap in the bulk, but have topologically protected edge states due to the time reversal symmetry. In two dimensions the helical edge states give rise to the quantum spin Hall (QSH) effect, in the absence of any external magnetic field. Here we review a recent theory which predicts that the QSH state can be realized in HgTe/CdTe semiconductor quantum wells. By varying the thickness of the quantum well, the band structure changes from a normal to an "inverted" type at a critical thickness $d_c$. We present an analytical solution of the helical edge states and explicitly demonstrate their topological stability. We also review the recent experimental observation of the QSH state in HgTe/(Hg,Cd)Te quantum wells. We review both the fabrication of the sample and the experimental setup. For thin quantum wells with well width $d_{QW}< 6.3$ nm, the insulating regime shows the conventional behavior of vanishingly small conductance at low temperature. However, for thicker quantum wells ($d_{QW}> 6.3$ nm), the nominally insulating regime shows a plateau of residual conductance close to $2e^2/h$. The residual conductance is independent of the sample width, indicating that it is caused by edge states. Furthermore, the residual conductance is destroyed by a small external magnetic field. The quantum phase transition at the critical thickness, $d_c= 6.3$ nm, is also independently determined from the occurrence of a magnetic field induced insulator to metal transition.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 05:35:19 GMT" } ]
2009-11-13T00:00:00
[ [ "Koenig", "Markus", "" ], [ "Buhmann", "Hartmut", "" ], [ "Molenkamp", "Laurens W.", "" ], [ "Hughes", "Taylor L.", "" ], [ "Liu", "Chao-Xing", "" ], [ "Qi", "Xiao-Liang", "" ], [ "Zhang", "Shou-Cheng", "" ] ]
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801.0902
Junichiro Yasuda
Junichiro Yasuda
An analytic study of the tricritical line in the U(Nf)xU(Nf) sigma model
14 pages
null
null
UT-Komaba/08-1
hep-ph nucl-th
null
The tricritical line of the first-order chiral phase transition is investigated in the U(Nf)xU(Nf) sigma model by means of the ring improved one-loop finite temperature effective potential. To locate the tricritical line in the space of the coupling constants, we expand the effective potential up to third order in the high temperature expansion, and up to sixth order in the order parameter expansion. In this approximation, the tricritical line can be evaluated to the lowest order of the coupling constants and it follows an analytic relation between the tree-level masses of the scalar bosons. The validity of the high temperature expansion, the order parameter expansion, and the ring improved perturbation is critically examined. This result does not alter if one includes the massless fermions with the small Yukawa couplings.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 13:39:33 GMT" }, { "version": "v2", "created": "Wed, 19 Mar 2008 11:35:34 GMT" } ]
2008-03-19T00:00:00
[ [ "Yasuda", "Junichiro", "" ] ]
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801.0903
Vyacheslav Futorny
Vyacheslav Futorny, Alexander Molev, Serge Ovsienko
Gelfand-Kirillov Conjecture and Harish-Chandra Modules for Finite W-Algebras
null
null
null
null
math.RA math.RT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We address two problems regarding the structure and representation theory of finite W-algebras associated with the general linear Lie algebras. Finite W-algebras can be defined either via the Whittaker model of Kostant or, equivalently, by the quantum Hamiltonian reduction. Our first main result is a proof of the Gelfand-Kirillov conjecture for the skew fields of fractions of the finite W-algebras. The second main result is a parametrization of finite families of irreducible Harish-Chandra modules by the characters of the Gelfand-Tsetlin subalgebra. As a corollary, we obtain a complete classification of generic irreducible Harish-Chandra modules for the finite W-algebras.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 05:26:56 GMT" }, { "version": "v2", "created": "Sat, 12 Jan 2008 20:40:39 GMT" }, { "version": "v3", "created": "Sat, 6 Jun 2009 00:09:45 GMT" } ]
2009-06-06T00:00:00
[ [ "Futorny", "Vyacheslav", "" ], [ "Molev", "Alexander", "" ], [ "Ovsienko", "Serge", "" ] ]
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801.0904
Hvedri Inassaridze
Alastair Hamilton and Andrey Lazarev
Characteristic classes of $\ai$-algebras
To be published in "Journal of Homotopy and Related Structures"
null
null
null
math.AT
null
Standard combinatorial construction, due to Kontsevich, associates to any $\ai$-algebra with an invariant inner product, an inhomogeneous class in the cohomology of the moduli spaces of Riemann surfaces with marked points. We propose an alternative version of this construction based on noncommutative geometry and use it to prove that homotopy equivalent algebras give rise to the same cohomology classes. Along the way we re-prove Kontsevich's theorem relating graph homology to the homology of certain infinite dimensional Lie algebras. An application to topological conformal field theories is given.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 05:29:13 GMT" } ]
2008-01-08T00:00:00
[ [ "Hamilton", "Alastair", "" ], [ "Lazarev", "Andrey", "" ] ]
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801.0905
Haiqing Zhang
Chao-Guang Huang, Hai-Qing Zhang, Han-Ying Guo
Cosmological Solutions with Torsion in a Model of de Sitter Gauge Theory of Gravity
16 pages, 2 figures
JCAP 0810:010,2008
10.1088/1475-7516/2008/10/010
null
gr-qc
null
The torsion is shown to be vitally important in the explanation of the evolution of the universe in a large class of gravitational theories containing quadratic terms of curvature and torsion. The cosmological solutions with homogeneous and isotropic torsion in a model of de Sitter gauge theory of gravity are presented, which may explain the observation data for SN Ia when parameters are suitably chosen and supply a natural transit from decelerating expansion to accelerating expansion without the help of the introduction of other strange fields in the theory.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 05:34:48 GMT" } ]
2011-07-19T00:00:00
[ [ "Huang", "Chao-Guang", "" ], [ "Zhang", "Hai-Qing", "" ], [ "Guo", "Han-Ying", "" ] ]
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801.0906
Kin Hung Fung
Yu-Rong Zhen, Kin Hung Fung, C. T. Chan
Collective plasmonic modes of metal nano-particles in two-dimensional periodic regular arrays
26 pages, 8 figures
Phys. Rev. B 78, 035419 (2008)
10.1103/PhysRevB.78.035419
null
physics.optics cond-mat.mes-hall
null
We investigate the collective plasmonic modes of metal nano-particles in periodic two-dimensional (2D) arrays within a point-dipole description. As an open system, the full-dynamic dispersion relations of the 2D arrays are obtained through an efficient method which gives an effective polarizability describing the collective response of a system. Both the dispersion relations and mode qualities are simultaneously related to the imaginary part of the effective polarizability, which has contributions from the single-particle response as well as the inter-particle coupling. The transversal long-range dipolar interaction is dominated by a wave term together with a purely geometrical constant representing the static geometrical contribution to resonant frequencies. As concrete examples, we considered small Ag spheres arranged in a square lattice. We find that inside the light-cone, the transverse quasi-mode has a reasonably high mode quality while the two in-plane modes show significant radiation damping. Near the light-line, we observe strong coupling with free photons for the bands of the transverse mode and the transversal in-plane mode, and the longitudinal in-plane mode exhibits a negative group-velocity inside the light-cone. Vanishing group velocities in the light-cone for all the quasi-modes are found to be intrinsic properties of the 2D metal nano-sphere dense arrays.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 09:07:34 GMT" } ]
2016-07-29T00:00:00
[ [ "Zhen", "Yu-Rong", "" ], [ "Fung", "Kin Hung", "" ], [ "Chan", "C. T.", "" ] ]
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801.0907
Taku Takeuchi
Taku Takeuchi and Oliver Krauss
Photophoretic Structuring of Circumstellar Dust Disks
15 pages, 9 figures, Accepted by ApJ; corrected a typo in the author name
null
10.1086/527426
null
astro-ph
null
We study dust accumulation by photophoresis in optically thin gas disks. Using formulae of the photophoretic force that are applicable for the free molecular regime and for the slip-flow regime, we calculate dust accumulation distances as a function of the particle size. It is found that photophoresis pushes particles (smaller than 10 cm) outward. For a Sun-like star, these particles are transported to 0.1-100 AU, depending on the particle size, and forms an inner disk. Radiation pressure pushes out small particles (< 1 mm) further and forms an extended outer disk. Consequently, an inner hole opens inside ~0.1 AU. The radius of the inner hole is determined by the condition that the mean free path of the gas molecules equals the maximum size of the particles that photophoresis effectively works on (100 micron - 10 cm, depending on the dust property). The dust disk structure formed by photophoresis can be distinguished from the structure of gas-free dust disk models, because the particle sizes of the outer disks are larger, and the inner hole radius depends on the gas density.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 06:28:48 GMT" }, { "version": "v2", "created": "Wed, 9 Jan 2008 00:46:15 GMT" } ]
2009-11-13T00:00:00
[ [ "Takeuchi", "Taku", "" ], [ "Krauss", "Oliver", "" ] ]
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801.0908
Ming-Yong Ye
Ming-Yong Ye and Xiu-Min Lin
A genuine four-partite entangled state
submitted
Physics Letters A 372 (2008) 4157-4159
10.1016/j.physleta.2008.03.035
null
quant-ph
null
In a recent paper, a genuine four-partite entangled state is proposed [Y. Yeo and W. K. Chua, Phys. Rev. Lett. 96, 060502 (2006)], which has been found to have many interesting entanglement properties. We show this state is locally equivalent to some graph states.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 07:54:45 GMT" } ]
2009-11-13T00:00:00
[ [ "Ye", "Ming-Yong", "" ], [ "Lin", "Xiu-Min", "" ] ]
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801.0909
Yi Chou
Y. Chou, Y. Chung, C. P. Hu and T. C. Yang (National Central University)
Precise Orbital Parameters and Anomalous Phase Variations of the Accretion-powered Millisecond Pulsar XTE J1807-294
26 pages, 8 figures, accepted by ApJ
null
10.1086/529126
null
astro-ph
null
This study reports pulse variation analysis results for the forth discovered accretion-powered millisecond pulsar XTE J1807-294 during its 2003 outburst observed by {\it Rossi X-ray Timing Explorer}. The pulsation is significantly detected only in the first $\sim$90d out of $\sim$150d observations. The pulse phase variation is too complex to be described as an orbital motion plus a simple polynomial model. The precise orbital parameters with $P_{orb}=40.073601(8)$ min and ${\it a_x}\sin {\it i}=4.823(5)$ lt-ms were obtained after applying the trend removal to the daily observed 150s segments pulse phases folded with a constant spin frequency without Keplerian orbit included. The binary barycenter corrected pulse phases show smooth evolution and clear negative phase shifts coincident with the flares seen on the light curve and the enhancements of fractional pulse amplitude. The non-flare pulse phases for the first $\sim$60d data are well described as a fourth order polynomial implying that the neutron star was spun-up during the first $\sim$60d with a rate $\dot \nu=(1.7\pm0.3) \times 10^{-13}$ Hz/s at the beginning of the outburst. Significant soft phase lags up to $\sim$500 $\mu s$ ($\sim$10% cycle) between 2 to 20 keV were detected for the nonflare pulse phases. We conclude that the anomalous phase shifts are unlikely due to the accretion torque but could result from the ``hot spot'' moving on the surface of neutron star.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 06:43:24 GMT" } ]
2009-11-13T00:00:00
[ [ "Chou", "Y.", "", "National Central\n University" ], [ "Chung", "Y.", "", "National Central\n University" ], [ "Hu", "C. P.", "", "National Central\n University" ], [ "Yang", "T. C.", "", "National Central\n University" ] ]
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801.091
Boddapati Anandarao G.
V. Venkata Raman and B.G. Anandarao
Infrared Spectroscopic Study of a Selection of AGB and Post-AGB Stars
14 pages; accepted in MNRAS, 2008
null
10.1111/j.1365-2966.2008.12915.x
null
astro-ph
null
We present here near-infrared spectroscopy in the H and K bands of a selection of nearly 80 stars that belong to various AGB types, namely S type, M type and SR type. This sample also includes 16 Post-AGB (PAGB) stars. From these spectra, we seek correlations between the equivalent widths of some important spectral signatures and the infrared colors that are indicative of mass loss. Repeated spectroscopic observations were made on some PAGB stars to look for spectral variations. We also analyse archival SPITZER mid-infrared spectra on a few PAGB stars to identify spectral features due to PAH molecules providing confirmation of the advanced stage of their evolution. Further, we model the SEDs of the stars (compiled from archival data) and compare circumstellar dust parameters and mass loss rates in different types. Our near-infrared spectra show that in the case of M and S type stars, the equivalent widths of the CO(3-0) band are moderately correlated with infrared colors, suggesting a possible relationship with mass loss processes. A few PAGB stars revealed short term variability in their spectra, indicating episodic mass loss: the cooler stars showed in CO first overtone bands and the hotter ones showed in HI Brackett lines. Our spectra on IRAS 19399+2312 suggest that it is a transition object. From the SPITZER spectra, there seems to be a dependence between the spectral type of the PAGB stars and the strength of the PAH features. Modelling of SEDs showed among the M and PAGB stars that the higher the mass loss rates, the higher the [K-12] colour in our sample.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 07:19:34 GMT" } ]
2009-11-13T00:00:00
[ [ "Raman", "V. Venkata", "" ], [ "Anandarao", "B. G.", "" ] ]
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801.0911
Nikolay Prokof'ev
Nikolay Prokof'ev and Boris Svistunov
Bold diagrammatic Monte Carlo: A generic technique for polaron (and many-body?) problems
15 pages, 15 figures, revtex4
null
null
null
cond-mat.str-el
null
We develop a Monte Carlo scheme for sampling series of Feynman diagrams for the proper self-energy which are self-consistently expressed in terms of renormalized particle propagators. This approach is used to solve the problem of a single spin-down fermion resonantly interacting with the Fermi gas of spin-up particles. Though the original series based on bare propagators are sign-alternating and divergent one can still determine the answer behind them by using two strategies (separately or together): (i) using proper series re-summation techniques, and (ii) introducing renormalized propagators which are defined in terms of the simulated proper self-energy, i.e. making the entire scheme self-consistent. Our solution is important for understanding the phase diagram and properties of the BCS-BEC crossover in the strongly imbalanced regime. On the technical side, we develop a generic sign-problem tolerant method for exact numerical solution of polaron-type models, and, possibly, of the interacting many-body Hamiltonians.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 07:25:39 GMT" } ]
2008-01-08T00:00:00
[ [ "Prokof'ev", "Nikolay", "" ], [ "Svistunov", "Boris", "" ] ]
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801.0912
Shuzo Izumi
Hirotada Ito, Shuzo Izumi
Diophantine inequality for equicharacteristic excellent Henselian local domains
A correction in the final part of the proof. Accepted to Comptes rendus mathematiques (Mathematical Reports)
C. R. Rep. Acad. Sci. Canada vol. 30 (2) 2008, pp. 48-55
null
null
math.AC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
G. Rond has proved a Diophantine type inequality for the field of quotients of the convergent or formal power series ring in multivariables. We generalize his theorem to the field of the quotients of an excellent Henselian local domain in equicharacteristic case.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 07:35:36 GMT" }, { "version": "v2", "created": "Thu, 14 Feb 2008 10:25:24 GMT" }, { "version": "v3", "created": "Sun, 24 Feb 2008 07:22:57 GMT" }, { "version": "v4", "created": "Sun, 20 Apr 2008 15:45:03 GMT" }, { "version": "v5", "created": "Mon, 27 Oct 2008 13:07:48 GMT" } ]
2011-02-15T00:00:00
[ [ "Ito", "Hirotada", "" ], [ "Izumi", "Shuzo", "" ] ]
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801.0913
Sandra Ninet
Sandra Ninet (IMPMC), Fr\'ed\'eric Datchi (IMPMC)
High pressure-high temperature phase diagram of ammonia
null
null
10.1063/1.2903491
null
cond-mat.mtrl-sci
null
The high pressure(P)-high temperature(T) phase diagram of solid ammonia has been investigated using diamond anvil cell and resistive heating techniques. The III-IV transition line has been determined up to 20 GPa and 500 K both on compression and decompression paths. No discontinuity is observed at the expected location for the III-IV-V triple point. The melting line has been determined by visual observations of the fluid-solid equilibrium up to 9 GPa and 900 K. The experimental data is well fitted by a Simon-Glatzel equation in the covered P-T range. These transition lines and their extrapolations are compared with reported calculations.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 07:47:05 GMT" } ]
2009-11-13T00:00:00
[ [ "Ninet", "Sandra", "", "IMPMC" ], [ "Datchi", "Frédéric", "", "IMPMC" ] ]
[ 0.0178895332, 0.0437517092, 0.0351432115, -0.0484227948, 0.0062118131, 0.0235510878, -0.045023419, 0.0168623831, 0.0454880819, -0.025605388, 0.0189655945, 0.0626561642, -0.0718026906, -0.0018051554, -0.0044173575, 0.0294205174, -0.0431647636, 0.1321599931, -0.0006228627, -0.0142455958, 0.0189778227, 0.0582051799, -0.0525803082, 0.0144534707, 0.0114881862, 0.0127293263, 0.0601616576, -0.0496455953, 0.0690147132, -0.0298362691, 0.0799709782, -0.0562976152, 0.0339204147, 0.0326731578, 0.0429935753, 0.0037570465, 0.0161653887, 0.1213993728, -0.1524095237, -0.0008039896, -0.0277575124, -0.0165444557, -0.0523357503, 0.0503792726, -0.0531672537, -0.0128516061, -0.0331622772, 0.0394719169, -0.0259722266, -0.0075630047, 0.0571780279, 0.1362686008, 0.1103452817, -0.088334918, 0.0071655954, -0.0457081832, -0.0088713989, -0.0082172016, 0.0166055951, -0.0707266331, -0.0160675645, -0.1428227872, 0.0087796887, 0.087601237, -0.044167459, 0.022279378, -0.1211059019, 0.0350453891, 0.1024215519, 0.0803133622, 0.0193079785, 0.0366105698, -0.0057899482, -0.1530942917, -0.0491809323, -0.037759997, -0.0702375099, -0.0216679778, -0.1054540873, -0.0364393778, 0.0089875646, -0.0345318131, -0.0539987534, -0.0283933673, -0.0202617608, 0.0366350263, -0.0341649726, 0.0013794688, -0.0661778226, -0.0955738798, -0.0349231064, 0.0389338844, -0.0306433141, 0.0397164747, -0.0202006213, -0.0874545053, 0.0822209269, -0.0155906733, -0.0304232109, -0.0048973057, -0.0190022793, 0.0237834193, 0.0428712927, 0.0620692223, 0.109171398, -0.0292737819, 0.0151871499, -0.0121974088, 0.0179751292, -0.0131206214, 0.1348990649, -0.083052434, -0.0694549233, -0.0056034713, -0.1846913993, -0.0152849732, 0.0109807253, -0.0373197906, 0.0261923298, 0.0153827975, -0.1223776117, 0.0364882872, -0.0200049728, -0.0350698419, -0.0127048697, -0.0262167864, 0.1083888039, -0.0496945046, 0.0280020721, 0.1214971989, -0.0095806215, -0.0488630049, 0.0377844535, -0.0732700527, 0.016984662, -0.0165566839, 0.0712646618, 0.021936994, 0.1322578192, -0.050526008, 0.0901446566, 0.088286005, 0.05155316, 0.0923456997, 0.054243315, 0.1030084938, -0.0866719112, 0.0661289096, 0.0696505681, -0.0080398964, -0.0622159578, 0.0468576141, 0.1207146049, -0.0667647645, 0.0720961615, -0.0262901541, -0.0015972797, 0.0332845598, 0.0196870454, 0.0315726399, -0.027097201, -0.050183624, -0.0164833162, -0.0260945074, -0.0138665279, 0.081976369, -0.1407684982, -0.0139521239, -0.0497434177, -0.0266814493, -0.0393496342, -0.0227929521, -0.0934217572, 0.0490586497, 0.1258992702, 0.0316704661, 0.1038889065, -0.0311079789, -0.0973836258, 0.1224754378, 0.0303987563, -0.0037264766, 0.013230673, -0.002551062, -0.0730744004, -0.0400588587, 0.0284911916, 0.1599419564, 0.0198704656, 0.0631941929, -0.0339693241, 0.0191979259, 0.1471270472, -0.008920311, -0.0207997914, -0.1078018621, 0.07067772, 0.0566889085, -0.0856936723, 0.1143560559, 0.1240406185, -0.0983129516, 0.0570312925, 0.0292004142, -0.0551726408, -0.0081132641, -0.0147958547, 0.0532161631, -0.0336024873, -0.0638789609, 0.0791883916, -0.0085229017, 0.047322277, 0.0932750255, -0.0266325381, -0.0147469426, -0.1351925284, -0.0113231083, 0.0617268384, 0.1161168888, -0.0874545053, -0.0189778227, -0.0292982366, 0.0596725382, -0.0328443497, 0.0428712927, -0.0268526413, -0.0421131589, 0.0380534716, 0.0705309808, -0.0042217099, -0.0440940931, -0.0302275643, 0.0926880762, 0.008149948, -0.0318172015, -0.0070310878, 0.0093177203, -0.0137197925, 0.0021383679, -0.0488874577, 0.0613844544, -0.034996476, 0.1068236232, -0.0113475639, 0.0248105694, -0.0330889113, -0.0916609317, 0.0907805115, 0.0655908808, 0.0099046631, 0.031450361, 0.0678408295, -0.076644972, -0.0738080814, -0.1312795877 ]
801.0914
Ngau Lam
Shun-Jen Cheng, Jae-Hoon Kwon, Ngau Lam
A BGG-type resolution for tensor modules over general linear superalgebra
11pages, LaTeX format
null
10.1007/s11005-008-0231-1
null
math.RT
null
We construct a Bernstein-Gelfand-Gelfand type resolution in terms of direct sums of Kac modules for the finite-dimensional irreducible tensor representations of the general linear superalgebra. As a consequence it follows that the unique maximal submodule of a corresponding reducible Kac module is generated by its proper singular vector.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 07:47:38 GMT" }, { "version": "v2", "created": "Mon, 10 Mar 2008 05:21:09 GMT" } ]
2009-11-13T00:00:00
[ [ "Cheng", "Shun-Jen", "" ], [ "Kwon", "Jae-Hoon", "" ], [ "Lam", "Ngau", "" ] ]
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801.0915
Jean-Francois Jaulent
Jean-Fran\c{c}ois Jaulent (IMB), Sebastian Pauli (DMS), Michael Pohst, Florence Soriano-Gafiuk (LMAM)
Computation of 2-groups of narrow logarithmic divisor classes of number fields
null
null
null
null
math.NT
null
We present an algorithm for computing the 2-group of narrow logarithmic divisor classes of degree 0 for number fields F. As an application, we compute in some cases the 2-rank of the wild kernel WK2(F).
[ { "version": "v1", "created": "Mon, 7 Jan 2008 07:48:44 GMT" } ]
2009-03-06T00:00:00
[ [ "Jaulent", "Jean-François", "", "IMB" ], [ "Pauli", "Sebastian", "", "DMS" ], [ "Pohst", "Michael", "", "LMAM" ], [ "Soriano-Gafiuk", "Florence", "", "LMAM" ] ]
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801.0916
Jean-Francois Jaulent
Jean-Fran\c{c}ois Jaulent (IMB), Florence Soriano-Gafiuk (LMAM)
Sur le sous-groupe des \'el\'ements de hauteur infinie du K2 d'un corps de nombres
null
Acta Arithmetica 122 (2006) 235-244
null
null
math.NT
null
By using the logarithmic approach of the classical kernels for the K2 of number fields, we compute the 2-rank of the wild kernel WK2(F) and the 2-rank of the subgroup of infinite heigh elements in K2(F) in terms of positive class groups for any number field F.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 07:50:34 GMT" } ]
2008-01-08T00:00:00
[ [ "Jaulent", "Jean-François", "", "IMB" ], [ "Soriano-Gafiuk", "Florence", "", "LMAM" ] ]
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801.0917
Syedafsar Abbas
Syed Afsar Abbas
Whither Nuclear Physics ?
Invited Talk at "International Conference on Recent Trends in Theoretical Physics, ISI, Kolkata, India, Dec 4-7 2007; 16 pages, 3 figures
"Recent Developments in Theoretical Ohysics", Ed S Ghosh and G Kar, World Scientific, Singapore, 2009
null
null
nucl-th
null
Nuclear Physics has had its ups and downs. However in recent years, bucked up by some new and often puzzling data, it has become a potentially very rich field. We review some of these exciting developments in a few important sectors of nuclear physics. Emphasis shall be on the study of exotic nuclei and the new physics that these nuclei are teaching us.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 08:01:16 GMT" } ]
2010-01-27T00:00:00
[ [ "Abbas", "Syed Afsar", "" ] ]
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801.0918
FengLan Shao
Jun Song, Feng-lan Shao, Qu-bing Xie, Yun-fei Wang, De-ming Wei
The influence of net-quarks on the yields and rapidity spectra of identified hadrons
8 pages, 7 figures
Int.J.Mod.Phys.A24:1161-1174,2009
10.1142/S0217751X0904302X
null
hep-ph
null
Within a quark combination model, we study systematically the yields and rapidity spectra of various hadrons in central Au+Au collisions at $\sqrt{s_{NN}}= 200$ GeV. We find that considering the difference in rapidity between net-quarks and newborn quarks, the data of multiplicities, rapidity distributions for $\pi^{\pm}$, $K^{\pm}$, $p(\bar{p})$ and, in particular the ratios of charged antihadron to hadron as a function of rapidity, can be well described. The effect of net-quarks on various hadrons is analysed, and the rapidity distributions for $K^{0}_{s}$, $\Lambda(\bar{\Lambda})$, $\Sigma^{+}(\bar{\Sigma}^{_-})$, $\mathrm{\Xi^{-}}$ ($\mathrm{\bar{\Xi}^{_+}}$) and $\mathrm{\Omega^{-}}(\mathrm{\bar{\Omega}}^{_+})$ are predicted. We discuss the rapidity distribution of net-baryon, and find that it reflects exactly the energy loss of colliding nuclei.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 08:08:51 GMT" }, { "version": "v2", "created": "Thu, 21 Feb 2008 05:08:16 GMT" } ]
2009-04-30T00:00:00
[ [ "Song", "Jun", "" ], [ "Shao", "Feng-lan", "" ], [ "Xie", "Qu-bing", "" ], [ "Wang", "Yun-fei", "" ], [ "Wei", "De-ming", "" ] ]
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801.0919
Jean-Francois Jaulent
Jean-Fran\c{c}ois Jaulent (IMB), Alexis Michel (IMB)
Approche logarithmique des noyaux \'etales sauvages des corps de nombres
null
Journal of Number Theory 120 (2006) 72--91
null
null
math.NT
null
We study the l-part of the the wild \'etale kernels WK2i(F) of an arbitary number field F for a given prime l in connection with the logarithmic l-class groups. From the logarithmic arithmetic we deduce rank formulas, periodicity and reflection theorems, triviality characterizations and various consequences.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 08:11:43 GMT" } ]
2008-01-08T00:00:00
[ [ "Jaulent", "Jean-François", "", "IMB" ], [ "Michel", "Alexis", "", "IMB" ] ]
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801.092
Jean-Francois Jaulent
Jean-Fran\c{c}ois Jaulent (IMB)
G\'en\'eralisation d'un Th\'eor\`eme d'Iwasawa
null
Journal de Th\'eorie des Nombres de Bordeaux 17 (2005) 527--553
null
null
math.NT
null
We extend to convenient finite quotients of a noetherian Lambda-module the classical result of K. Iwasawa giving the asymptotic expression of the l-part of the number of ideal class groups in Zl-extensions of number fields. Then, in the arithmetic context, we compute the three characters associated by this way to the l-groups of T-infinitesimal S-classes in the cyclotomic tower and relate them to the classical invariants and the decomposition characters associated to the finite sets of places S and T. A main tool in this study is the so-called Spiegelungssatz of Georges Gras, which exchanges (wild or tame) ramification and decomposition. The main results of this arithmetical part extend those we obtained with Christian Maire in a previous article. The most intricate study of the wild contribution of the sets S and T involves a generalization of a classical result of R. Greenberg on the genus theory of cyclotomic towers.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 08:17:29 GMT" }, { "version": "v2", "created": "Mon, 10 Mar 2008 08:29:40 GMT" } ]
2008-03-10T00:00:00
[ [ "Jaulent", "Jean-François", "", "IMB" ] ]
[ 0.0404574051, 0.0016579328, -0.0064393207, -0.0093831941, 0.048230771, -0.0992322415, -0.0462040529, -0.0366861708, -0.0899965614, -0.009357539, 0.0266295429, -0.0312986895, -0.1728098243, -0.0323248766, 0.0543878898, 0.082197547, 0.0829158798, 0.0042779152, 0.0667021275, 0.1364828199, 0.0272709094, -0.0501548685, -0.0032966244, -0.0092420932, 0.036121767, -0.0684466437, -0.0111918477, 0.0958971381, 0.1758883893, -0.065316774, 0.072089605, -0.0062308768, -0.0073564751, -0.0008722586, -0.1164721772, 0.1084679216, -0.0145846773, 0.0606476292, -0.0117690777, 0.0126220947, -0.0579282343, 0.08173576, -0.0998479575, 0.024038421, 0.0924081057, 0.0350955799, 0.043330729, 0.032837972, -0.0568507388, -0.0403804444, -0.0027691005, 0.0895347819, 0.0132891163, 0.0169192515, -0.1430504173, 0.0189972799, -0.0947170258, 0.0768613741, 0.0711660385, -0.0601858422, 0.0464605987, -0.0676770061, 0.0417914502, 0.0067343498, -0.0954866633, 0.0641366616, -0.1156512275, 0.0285536423, 0.0889190659, 0.1115464866, -0.1486944407, 0.0540800355, -0.0162137486, 0.0916897729, -0.0122180339, 0.0004850335, -0.0655733272, 0.0543365814, -0.0199208464, 0.0208957251, 0.0402521677, 0.0339411199, 0.0566968098, 0.0709608048, 0.0913819149, -0.0053489977, 0.0144692315, 0.0973851085, -0.1028752029, 0.0505140349, -0.0038481997, 0.0514632575, -0.0549522936, 0.0463836342, 0.0778875649, -0.0739367455, 0.0924594104, 0.0542339608, -0.0345568322, 0.0416375212, 0.0453831032, 0.0036782376, 0.0923054814, -0.1302230805, 0.0957432091, 0.0500779077, 0.0025125537, -0.0109481281, -0.1324806958, -0.0414579399, -0.0116857002, -0.032812316, -0.0211137887, 0.010807028, 0.0077669499, -0.0115574263, -0.0936395302, 0.0184970126, -0.0187792145, 0.0184841864, 0.0539261065, -0.1075443551, 0.0051277261, -0.0219732206, 0.0741419792, -0.0512323678, -0.0724487752, -0.0695241392, 0.033120174, -0.0431511477, 0.0814792141, -0.027501801, -0.0162522309, -0.0033800022, -0.0610067919, -0.1235528663, 0.0467428006, 0.0463323258, 0.0029759412, 0.0010839097, 0.0301698856, 0.0470506549, 0.1427425593, -0.0382254496, -0.0201132577, -0.0447160825, -0.0625973791, 0.0262960307, 0.0042715017, -0.0212292355, -0.0564915724, -0.0596214421, 0.0844038501, -0.0671639144, -0.0521815903, -0.1078522131, -0.0035018618, 0.1046197265, 0.0407909155, 0.0059101935, 0.0495904684, 0.1017464027, -0.0476407111, 0.0280918572, 0.0795294642, 0.0457166135, 0.0303494688, 0.007337234, -0.0495648123, -0.0756812617, -0.0524894446, -0.0533103943, -0.0991809368, -0.0140844109, -0.048230771, 0.0067856587, -0.0996427163, -0.0647523776, -0.0727566332, -0.012237275, 0.0036974787, 0.0346337967, -0.1350461543, -0.0096076718, -0.0617251247, -0.0338641591, 0.0214729551, 0.0491543375, 0.0575690679, 0.025770111, -0.0535156317, -0.0046627354, 0.110417679, 0.098616533, 0.124065958, -0.0063687707, 0.0027338252, 0.0527459905, -0.026347341, 0.0738854334, 0.0147770867, -0.0294259004, 0.0906635895, -0.0235894639, 0.0286819153, 0.0149310147, 0.0371223018, 0.0448700078, -0.102772586, -0.045639649, -0.0217679832, -0.0784519687, 0.1014385447, 0.0216910187, -0.0031875921, 0.0361987315, -0.0513093285, 0.0434333496, -0.0146488138, 0.1450001597, 0.0163035393, 0.0382254496, 0.0111854337, 0.0141228931, 0.0229994077, 0.0734236538, -0.0080299098, -0.0343002863, -0.0366861708, 0.0033511405, 0.0953840464, 0.0254366007, -0.0943065509, -0.0804530308, -0.0423558503, -0.0058877454, 0.041175738, 0.0214986093, -0.0229994077, -0.1428451687, -0.0338641591, 0.0571072847, 0.033812847, 0.0735775754, -0.0908175111, -0.0068497956, -0.0370196812, -0.0040630577, -0.008773895, -0.0459731594, -0.0583900176, -0.0361987315, 0.006054501, -0.0188176967, -0.1366880536, 0.0505140349 ]
801.0921
Jean-Francois Jaulent
Francisco Diaz Y Diaz (IMB), Jean-Fran\c{c}ois Jaulent (IMB), Sebastian Pauli (DMS), Michael Pohst, Florence Soriano-Gafiuk (LMAM)
A new Algorithm for the Computation of logarithmic l-Class Groups of Number Fields
null
Experimental Mathematics (Project Euclid) 14 (2005) 67--76
null
null
math.NT
null
We present an algorithm for the computation of logarithmic l-class groups of number fields. Our principal motivation is the effective determination of the l-rank of the wild kernel in the K-theory of number fields.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 08:25:12 GMT" } ]
2008-01-08T00:00:00
[ [ "Diaz", "Francisco Diaz Y", "", "IMB" ], [ "Jaulent", "Jean-François", "", "IMB" ], [ "Pauli", "Sebastian", "", "DMS" ], [ "Pohst", "Michael", "", "LMAM" ], [ "Soriano-Gafiuk", "Florence", "", "LMAM" ] ]
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801.0922
A. M. Abd Elfattah
A. M. Abd Elfattah, O. Mohamed Marwa
Estimating of $P(Y<X)$ in the Exponential case Based on Censored Samples
Submitted to the Electronic Journal of Statistics (http://www.i-journals.org/ejs/) by the Institute of Mathematical Statistics (http://www.imstat.org)
null
null
IMS-EJS-EJS_2008_166
stat.ME
null
In this article, the estimation of reliability of a system is discussed $p(y<x)$ when strength, $X$, and stress, $Y$, are two independent exponential distribution with different scale parameters when the available data are type II Censored sample. Different methods for estimating the reliability are applied. The point estimators obtained are maximum likelihood estimator, uniformly minimum variance unbiased estimator, and Bayesian estimators based on conjugate and non informative prior distributions. A comparison of the estimates obtained is performed. Interval estimators of the reliability are also discussed.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 08:30:01 GMT" } ]
2008-01-08T00:00:00
[ [ "Elfattah", "A. M. Abd", "" ], [ "Marwa", "O. Mohamed", "" ] ]
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801.0923
J. S. Kaastra
V. Petrosian, A. Bykov
Particle acceleration mechanisms
22 pages, 5 figures, accepted for publication in Space Science Reviews, special issue "Clusters of galaxies: beyond the thermal view", Editor J.S. Kaastra, Chapter 11; work done by an international team at the International Space Science Institute (ISSI), Bern, organised by J.S. Kaastra, A.M. Bykov, S. Schindler & J.A.M. Bleeker
null
10.1007/s11214-008-9315-6
null
astro-ph
null
We review the possible mechanisms for production of non-thermal electrons which are responsible for non-thermal radiation in clusters of galaxies. Our primary focus is on non-thermal Bremsstrahlung and inverse Compton scattering, that produce hard X-ray emission. We briefly review acceleration mechanisms and point out that in most astrophysical situations, and in particular for the intracluster medium, shocks, turbulence and plasma waves play a crucial role. We consider two scenarios for production of non-thermal radiation. The first is hard X-ray emission due to non-thermal Bremsstrahlung by nonrelativistic particles. Non-thermal tails are produced by accelerating electrons from the background plasma with an initial Maxwellian distribution. However, these tails are accompanied by significant heating and they are present for a short time of <10^6 yr, which is also the time that the tail will be thermalised. Such non-thermal tails, even if possible, can only explain the hard X-ray but not the radio emission which needs GeV or higher energy electrons. For these and for production of hard X-rays by the inverse Compton model, we need the second scenario where there is injection and subsequent acceleration of relativistic electrons. It is shown that a steady state situation, for example arising from secondary electrons produced from cosmic ray proton scattering by background protons, will most likely lead to flatter than required electron spectra or it requires a short escape time of the electrons from the cluster. An episodic injection of relativistic electrons, presumably from galaxies or AGN, and/or episodic generation of turbulence and shocks by mergers can result in an electron spectrum consistent with observations but for only a short period of less than one billion years.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 15:25:10 GMT" } ]
2009-11-13T00:00:00
[ [ "Petrosian", "V.", "" ], [ "Bykov", "A.", "" ] ]
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801.0924
Wojciech Satula
M. Zalewski (Univ. of Warsaw), J. Dobaczewski (Univ. of Warsaw and Univ. of Jyvaskyla), W. Satula (Univ. of Warsaw), and T.R. Werner (Univ. of Warsaw)
Spin-orbit and tensor mean-field effects on spin-orbit splitting including self-consistent core polarizations
15 pages, 7 figures, submitted to Physical Review C
Phys.Rev.C77:024316,2008
10.1103/PhysRevC.77.024316
null
nucl-th
null
A new strategy of fitting the coupling constants of the nuclear energy density functional is proposed, which shifts attention from ground-state bulk to single-particle properties. The latter are analyzed in terms of the bare single-particle energies and mass, shape, and spin core-polarization effects. Fit of the isoscalar spin-orbit and both isoscalar and isovector tensor coupling constants directly to the f5/2-f7/2 spin-orbit splittings in 40Ca, 56Ni, and 48Ca is proposed as a practical realization of this new programme. It is shown that this fit requires drastic changes in the isoscalar spin-orbit strength and the tensor coupling constants as compared to the commonly accepted values but it considerably and systematically improves basic single-particle properties including spin-orbit splittings and magic-gap energies. Impact of these changes on nuclear binding energies is also discussed.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 08:32:18 GMT" } ]
2008-11-26T00:00:00
[ [ "Zalewski", "M.", "", "Univ. of Warsaw" ], [ "Dobaczewski", "J.", "", "Univ. of Warsaw and\n Univ. of Jyvaskyla" ], [ "Satula", "W.", "", "Univ. of Warsaw" ], [ "Werner", "T. R.", "", "Univ. of\n Warsaw" ] ]
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801.0925
Jacques Moret-Bailly
Jacques Moret-Bailly
Light emission of very low density hydrogen excited by an extremely hot light source; applications in astrophysics
16 pages,3 figures
null
null
null
physics.gen-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Stromgren studied the action of an extremely hot source on a diluted pure hydrogen cloud; a very ionized, spherical hydrogen plasma surrounded by neutral atomic hydrogen is formed. A relatively thin intermediate, partially ionized, hydrogen shell, is cooled by the radiation of the atoms. Stromgren was unaware of that this plasma, similar to the plasma of a gas laser, can be superradiant at several eigen frequencies of atomic hydrogen; the superradiant rays emitted tangentially with the sphere appear resulting from a discontinuous ring because of the competition of optical modes. The superradiance intensely depopulates the excited levels, including the continuum of proton-electron collisions, by cascades of transitions combined into resonant multiphotonic transitions so that the gas is cooled brutally beyond the radius of the Stromgren sphere. The extreme brightness of the rays emitted by the source allows a multiphotonic non-resonant absorption leading in stationary states or the ionization continuum. This absorption combines with the superradiant emissions in a multiphotonic diffusion induced by the superradiant rays. Although its brightness remains higher than that of the superradiant rays, the source becomes invisible if it is observed through a small solid angle. The lines emitted inside the sphere are all the more weak as they arrive of an internal area, lower in atoms, and more reddened also by a parametric transfer of energy towards the thermal radiation catalyzed by excited atomic hydrogen present in the sphere only. The Stromgren sphere appears to help to simply explain the appearance and the spectrum of supernova 1987A.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 08:32:36 GMT" }, { "version": "v2", "created": "Sat, 19 Jul 2008 07:44:07 GMT" } ]
2008-07-19T00:00:00
[ [ "Moret-Bailly", "Jacques", "" ] ]
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801.0926
Oren Raz
E. Putterman, O. Raz
The Square Cat
13 pages, 5 figures
Am. J. Phys. 76 1040 (2008)
10.1119/1.2952448
null
physics.class-ph
null
We present a simple, two dimensional example of a "cat" -- a body with zero angular momentum that can rotate itself with no external forces. This model is used to explain why this problem is known to be a gauge theory and to illustrate the importance of non-commutative operators. We will also show a comparison between the free-space "cat" in Newtonian mechanics and the same problem in Aristotelian mechanics at low Reynolds number; this simple example shows the analogy between (angular) momentum in Newtonian mechanics and (torque) force in Aristotelian mechanics. We will end by pointing out a topological invariant common to our model in free space and at low Reynolds number.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 08:53:43 GMT" } ]
2010-07-28T00:00:00
[ [ "Putterman", "E.", "" ], [ "Raz", "O.", "" ] ]
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801.0927
Stefano Andreon
S. Andreon, E. Puddu, R. De Propris, J.-C. Cuillandre
Galaxy evolution in the high redshift, colour-selected cluster RzCS 052 at z=1.02
MNRAS, in press
null
10.1111/j.1365-2966.2008.12890.x
null
astro-ph
null
We present deep I and z' imaging of the colour-selected cluster RzCS 052 and study the color-magnitude relation of this cluster, its scatter, the morphological distribution on the red sequence, the luminosity and stellar mass functions of red galaxies and the cluster blue fraction. We find that the stellar populations of early type galaxies in this cluster are uniformly old and that their luminosity function does not show any sign of evolution other than the passive evolution of their stellar populations. We rule out a significant contribution from mergers in the buildup of the red sequence of RzCS 052. The cluster has a large (~30%) blue fraction and and we infer that the evolution of the blue galaxies is faster than an exponentially declining star formation model and that these objects have probably experienced starburst episodes. Mergers are unlikely to be the driver of the observed colour evolution, because of the measured constancy of the mass function, as derived from near-infrared photometry of 32 clusters, including RzCS 052, presented in a related paper. Mechanisms with clustercentric radial dependent efficiencies are disfavored as well, because of the observed constant blue fraction with clustercentric distance.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 09:03:42 GMT" } ]
2009-11-13T00:00:00
[ [ "Andreon", "S.", "" ], [ "Puddu", "E.", "" ], [ "De Propris", "R.", "" ], [ "Cuillandre", "J. -C.", "" ] ]
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801.0928
Yveline Lebreton
Yveline Lebreton, Josefina Montalban, Joergen Christensen-Dalsgaard, Ian W. Roxburgh, Achim Weiss
CoRoT/ESTA-TASK 1 and TASK 3 comparison of the internal structure and seismic properties of representative stellar models: Comparisons between the ASTEC, CESAM, CLES, GARSTEC and STAROX codes
26 pages, 21 figures, accepted for publication in Astrophysics and Space Science, CoRoT/ESTA Volume
Astrophys.Space Sci.316:187-213,2008
10.1007/s10509-008-9740-8
null
astro-ph
null
We compare stellar models produced by different stellar evolution codes for the CoRoT/ESTA project, comparing their global quantities, their physical structure, and their oscillation properties. We discuss the differences between models and identify the underlying reasons for these differences. The stellar models are representative of potential CoRoT targets. Overall we find very good agreement between the five different codes, but with some significant deviations. We find noticeable discrepancies (though still at the per cent level) that result from the handling of the equation of state, of the opacities and of the convective boundaries. The results of our work will be helpful in interpreting future asteroseismology results from CoRoT.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 09:05:01 GMT" } ]
2009-06-23T00:00:00
[ [ "Lebreton", "Yveline", "" ], [ "Montalban", "Josefina", "" ], [ "Christensen-Dalsgaard", "Joergen", "" ], [ "Roxburgh", "Ian W.", "" ], [ "Weiss", "Achim", "" ] ]
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801.0929
Hidefumi Ohsugi
Satoshi Aoki, Takayuki Hibi, Hidefumi Ohsugi, Akimichi Takemura
Groebner bases of nested configurations
11 pages
Journal of Algebra 320 (2008), pp. 2583-2593
10.1016/j.jalgebra.2008.05.023
null
math.AC
null
In this paper we introduce a new and large family of configurations whose toric ideals possess quadratic Groebner bases. As an application, a generalization of algebras of Segre-Veronese type will be studied.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 09:14:56 GMT" } ]
2008-09-23T00:00:00
[ [ "Aoki", "Satoshi", "" ], [ "Hibi", "Takayuki", "" ], [ "Ohsugi", "Hidefumi", "" ], [ "Takemura", "Akimichi", "" ] ]
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801.093
Sylvain Schwartz
Sylvain Schwartz (TRT), Fran\c{c}ois Gutty, Gilles Feugnet (TRT), Philippe Bouyer (LCFIO), Jean-Paul Pocholle (TRT)
Suppression of Nonlinear Interactions in Resonant Macroscopic Quantum Devices : the Example of the Solid-State Ring Laser Gyroscope
null
Physical Review Letters 100, 18 (2008) 183901
10.1103/PhysRevLett.100.183901
null
physics.optics
null
We study the suppression of nonlinear interactions in resonant macroscopic quantum devices in the case of the solid-state ring laser gyroscope. These nonlinear interactions are tuned by vibrating the gain medium along the cavity axis. Beat note occurrence under rotation provides a precise measurement of the strength of nonlinear interactions, which turn out to vanish for some discrete values of the amplitude of vibration. Our theoretical description, in very good agreement with the measured data, suggests the use of a higher vibration frequency to achieve quasi-ideal rotation sensing over a broad range of rotation speeds. We finally underline the analogy between this device and some other macroscopic quantum rotation sensors, such as ring-shaped superfluid configurations, where nonlinear interactions could be tuned for example by the use of magnetically-induced Feschbach resonance.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 09:16:44 GMT" } ]
2011-09-26T00:00:00
[ [ "Schwartz", "Sylvain", "", "TRT" ], [ "Gutty", "François", "", "TRT" ], [ "Feugnet", "Gilles", "", "TRT" ], [ "Bouyer", "Philippe", "", "LCFIO" ], [ "Pocholle", "Jean-Paul", "", "TRT" ] ]
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801.0931
Ryuhei Mori
Ryuhei Mori, Kenta Kasai, Tomoharu Shibuya, and Kohichi Sakaniwa
The Asymptotic Bit Error Probability of LDPC Codes for the Binary Erasure Channel with Finite Iteration Number
5 pages, 6 figures, correcting errors in Theorem 1 and poor English
null
null
null
cs.IT math.IT
null
We consider communication over the binary erasure channel (BEC) using low-density parity-check (LDPC) code and belief propagation (BP) decoding. The bit error probability for infinite block length is known by density evolution and it is well known that a difference between the bit error probability at finite iteration number for finite block length $n$ and for infinite block length is asymptotically $\alpha/n$, where $\alpha$ is a specific constant depending on the degree distribution, the iteration number and the erasure probability. Our main result is to derive an efficient algorithm for calculating $\alpha$ for regular ensembles. The approximation using $\alpha$ is accurate for $(2,r)$-regular ensembles even in small block length.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 09:40:41 GMT" }, { "version": "v2", "created": "Wed, 23 Jan 2008 12:37:13 GMT" } ]
2008-01-23T00:00:00
[ [ "Mori", "Ryuhei", "" ], [ "Kasai", "Kenta", "" ], [ "Shibuya", "Tomoharu", "" ], [ "Sakaniwa", "Kohichi", "" ] ]
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801.0932
Alice Sinatra
Yun Li (LKB - Lhomond, ECNU), Yvan Castin (LKB - Lhomond), Alice Sinatra (LKB - Lhomond)
Optimum spin-squeezing in Bose-Einstein condensates with particle losses
4 pages
Physical Review Letters 100, 21 (2008) 210401
10.1103/PhysRevLett.100.210401
null
quant-ph
null
The problem of spin squeezing with a bimodal condensate in presence of particle losses is solved analytically by the Monte Carlo wavefunction method. We find the largest obtainable spin squeezing as a function of the one-body loss rate, the two-body and three-body rate constants, and the s-wave scattering length.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 09:22:52 GMT" }, { "version": "v2", "created": "Tue, 6 May 2008 07:29:45 GMT" } ]
2009-11-13T00:00:00
[ [ "Li", "Yun", "", "LKB - Lhomond, ECNU" ], [ "Castin", "Yvan", "", "LKB - Lhomond" ], [ "Sinatra", "Alice", "", "LKB - Lhomond" ] ]
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801.0933
Abhijit Pal
Abhijit Pal
Relative Hyperbolic Extensions of Groups and Cannon-Thurston Maps
16 pages, No figures
null
null
null
math.GR math.GT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Let $1\to (K,K_1)\to (G,N_G(K_1))\to(Q,Q_1)\to 1$ be a short exact sequence of pairs of finitely generated groups with $K$ strongly hyperbolic relative to proper subgroup $K_1$. Assuming that for all $g\in G$ there exists $k\in K$ such that $gK_1g^{-1}=kK_1k^{-1}$, we prove that there exists a quasi-isometric section $s\colon Q \to G$. Further we prove that if $G$ is strongly hyperbolic relative to the normalizer subgroup $N_G(K_1)$ and weakly hyperbolic relative to $K_1$, then there exists a Cannon-Thurston map for the inclusion $i\colon\Gamma_K\to \Gamma_G$.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 10:19:20 GMT" }, { "version": "v2", "created": "Tue, 22 Jul 2008 13:08:56 GMT" } ]
2008-07-22T00:00:00
[ [ "Pal", "Abhijit", "" ] ]
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801.0934
Haijun Zhou
Jie Zhou, Zhong-Can Ou-Yang, and Haijun Zhou
Simulating the collapse transition of a two-dimensional semiflexible lattice polymer
16 pages
null
10.1063/1.2842064
null
cond-mat.soft
null
It has been revealed by mean-field theories and computer simulations that the nature of the collapse transition of a polymer is influenced by its bending stiffness $\epsilon_{\rm b}$. In two dimensions, a recent analytical work demonstrated that the collapse transition of a partially directed lattice polymer is always first-order as long as $\epsilon_{\rm b}$ is positive [H. Zhou {\em et al.}, Phys. Rev. Lett. {\bf 97}, 158302 (2006)]. Here we employ Monte Carlo simulation to investigate systematically the effect of bending stiffness on the static properties of a 2D lattice polymer. The system's phase-diagram at zero force is obtained. Depending on $\epsilon_{\rm b}$ and the temperature $T$, the polymer can be in one of three phases: crystal, disordered globule, or swollen coil. The crystal-globule transition is discontinuous, the globule-coil transition is continuous. At moderate or high values of $\epsilon_{\rm b}$ the intermediate globular phase disappears and the polymer has only a discontinuous crystal-coil transition. When an external force is applied, the force-induced collapse transition will either be continuous or discontinuous, depending on whether the polymer is originally in the globular or the crystal phase at zero force. The simulation results also demonstrate an interesting scaling behavior of the polymer at the force-induced globule-coil transition.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 09:36:15 GMT" } ]
2009-11-13T00:00:00
[ [ "Zhou", "Jie", "" ], [ "Ou-Yang", "Zhong-Can", "" ], [ "Zhou", "Haijun", "" ] ]
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801.0935
Michael Lashkevich
Michael Lashkevich (Landau Institute)
Boundary form factors in the Smirnov--Fateev model with a diagonal boundary $S$ matrix
15 pages, 2 figures included in the LaTeX file
null
null
null
hep-th
null
The boundary conditions with diagonal boundary $S$ matrix and the boundary form factors for the Smirnov--Fateev model on a half line has been considered in the framework of the free field representation. In contrast to the case of the sine-Gordon model, in this case the free field representation is shown to impose severe restrictions on the boundary $S$ matrix, so that a finite number of solutions is only consistent with the free field realization.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 10:25:21 GMT" } ]
2008-01-08T00:00:00
[ [ "Lashkevich", "Michael", "", "Landau Institute" ] ]
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801.0936
Robert Alicki
Robert Alicki
Pure decoherence in quantum systems
11 pages
Open Sys.& Information Dyn. 11: 53-61 (2004)
null
null
quant-ph
null
A popular model of decoherence based on the linear coupling to harmonic oscillator heat baths is analized and shown to be inappropriate in the regime where decoherence dominates over energy dissipation, called pure decoherence regime. The similar mechanism essentially related to the energy conservation implies that, on the contrary to the recent conjectures, chaotic environments can be less efficient decoherers than regular ones. Finally, the elastic scattering mechanism is advocated as the simplest source of pure decoherence.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 10:12:31 GMT" } ]
2008-01-08T00:00:00
[ [ "Alicki", "Robert", "" ] ]
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801.0937
Tsuneo Uematsu
Yoshio Kitadono, Ken Sasaki, Takahiro Ueda and Tsuneo Uematsu
Target Mass Corrections for the Virtual Photon Structure Functions to the Next-to-next-to-leading Order in QCD
24 pages, LaTeX, 7 eps figures, REVTeX 4
Phys.Rev.D77:054019,2008
10.1103/PhysRevD.77.054019
YNU-HEPTh-07-102,KUNS-2119
hep-ph
null
We investigate target mass effects in the unpolarized virtual photon structure functions $F_2^\gamma(x,Q^2,P^2)$ and $F_L^\gamma(x,Q^2,P^2)$ in perturbative QCD for the kinematical region $\Lambda^2 \ll P^2 \ll Q^2$, where $-Q^2(-P^2)$ is the mass squared of the probe (target) photon and $\Lambda$ is the QCD scale parameter. We obtain the Nachtmann moments for the structure functions and then, by inverting the moments, we get the expressions in closed form for $F_2^\gamma(x,Q^2,P^2)$ up to the next-to-next-to-leading order and for $F_L^\gamma(x,Q^2,P^2)$ up to the next-to-leading order, both of which include the target mass corrections. Numerical analysis exhibits that target mass effects appear at large $x$ and become sizable near $x_{\rm max}(=1/(1+\frac{P^2}{Q^2}))$, the maximal value of $x$, as the ratio $P^2/Q^2$ increases.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 10:16:10 GMT" } ]
2008-11-26T00:00:00
[ [ "Kitadono", "Yoshio", "" ], [ "Sasaki", "Ken", "" ], [ "Ueda", "Takahiro", "" ], [ "Uematsu", "Tsuneo", "" ] ]
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801.0938
Sang-Woon Jeon
Sang-Woon Jeon, Natasha Devroye, Mai Vu, Sae-Young Chung, Vahid Tarokh
Cognitive Networks Achieve Throughput Scaling of a Homogeneous Network
28 pages, 12 figures, submitted to IEEE Trans. on Information Theory
IEEE Transactions on Information Theory, vol. 57, no. 8, pp. 5103-5115, Aug. 2011
10.1109/TIT.2011.2158874
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study two distinct, but overlapping, networks that operate at the same time, space, and frequency. The first network consists of $n$ randomly distributed \emph{primary users}, which form either an ad hoc network, or an infrastructure-supported ad hoc network with $l$ additional base stations. The second network consists of $m$ randomly distributed, ad hoc secondary users or cognitive users. The primary users have priority access to the spectrum and do not need to change their communication protocol in the presence of secondary users. The secondary users, however, need to adjust their protocol based on knowledge about the locations of the primary nodes to bring little loss to the primary network's throughput. By introducing preservation regions around primary receivers and avoidance regions around primary base stations, we propose two modified multihop routing protocols for the cognitive users. Base on percolation theory, we show that when the secondary network is denser than the primary network, both networks can simultaneously achieve the same throughput scaling law as a stand-alone network. Furthermore, the primary network throughput is subject to only a vanishingly fractional loss. Specifically, for the ad hoc and the infrastructure-supported primary models, the primary network achieves sum throughputs of order $n^{1/2}$ and $\max\{n^{1/2},l\}$, respectively. For both primary network models, for any $\delta>0$, the secondary network can achieve sum throughput of order $m^{1/2-\delta}$ with an arbitrarily small fraction of outage. Thus, almost all secondary source-destination pairs can communicate at a rate of order $m^{-1/2-\delta}$.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 10:52:39 GMT" }, { "version": "v2", "created": "Thu, 16 Jul 2009 05:24:13 GMT" } ]
2016-11-17T00:00:00
[ [ "Jeon", "Sang-Woon", "" ], [ "Devroye", "Natasha", "" ], [ "Vu", "Mai", "" ], [ "Chung", "Sae-Young", "" ], [ "Tarokh", "Vahid", "" ] ]
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801.0939
Christos Athanasiadis
Christos A. Athanasiadis
On the graph-connectivity of skeleta of convex polytopes
Added Remark 1.2 and reference to the article [Incidence graphs of convex polytopes, J. Combin. Theory 2 (1967), 466-506] by G.T. Sallee
null
null
null
math.CO
null
Given a $d$-dimensional convex polytope $P$ and nonnegative integer $k$ not exceeding $d-1$, let $G_k (P)$ denote the simple graph on the node set of $k$-dimensional faces of $P$ in which two such faces are adjacent if there exists a $(k+1)$-dimensional face of $P$ which contains them both. The graph $G_k (P)$ is isomorphic to the dual graph of the $(d-k)$-dimensional skeleton of the normal fan of $P$. For fixed values of $k$ and $d$, the largest integer $m$ such that $G_k (P)$ is $m$-vertex-connected for all $d$-dimensional polytopes $P$ is determined. This result generalizes Balinski's theorem on the one-dimensional skeleton of a $d$-dimensional convex polytope.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 10:24:43 GMT" }, { "version": "v2", "created": "Thu, 10 Jan 2008 07:50:04 GMT" } ]
2008-01-10T00:00:00
[ [ "Athanasiadis", "Christos A.", "" ] ]
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801.094
Herve Mohrbach
Pierre Gosselin (IF), Herve Mohrbach (FCN, LPMC - EA 3468)
Diagonal Representation for a Generic Matrix Valued Quantum Hamiltonian
Significant revision, typos corrected and references added
Eur.Phys.J.C64:495-527,2009
10.1140/epjc/s10052-009-1155-3
null
math-ph cond-mat.other hep-th math.MP quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A general method to derive the diagonal representation for a generic matrix valued quantum Hamiltonian is proposed. In this approach new mathematical objects like non-commuting operators evolving with the Planck constant promoted as a running variable are introduced. This method leads to a formal compact expression for the diagonal Hamiltonian which can be expanded in a power series of the Planck constant. In particular, we provide an explicit expression for the diagonal representation of a generic Hamiltonian to the second order in the Planck constant. This last result is applied, as a physical illustration, to Dirac electrons and neutrinos in external fields.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 10:32:54 GMT" }, { "version": "v2", "created": "Fri, 6 Jun 2008 08:24:54 GMT" }, { "version": "v3", "created": "Fri, 18 Jul 2008 12:24:28 GMT" }, { "version": "v4", "created": "Tue, 3 Feb 2009 14:50:33 GMT" }, { "version": "v5", "created": "Mon, 25 May 2009 04:47:27 GMT" } ]
2009-11-10T00:00:00
[ [ "Gosselin", "Pierre", "", "IF" ], [ "Mohrbach", "Herve", "", "FCN, LPMC - EA 3468" ] ]
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801.0941
Philippe Jaming
Philippe Jaming (MAPMO), Mat\'e Matolcsi, Szilard Gy. R\'evesz
On the extremal rays of the cone of positive, positive definite functions
null
Journal of fourier analysis and applications 15 (2009) 561-582
10.1007/s00041-008-9057-6
null
math.CA math.FA math.PR
null
The aim of this paper is to investigate the cone of non-negative, radial, positive-definite functions in the set of continuous functions on $\R^d$. Elements of this cone admit a Choquet integral representation in terms of the extremals. The main feature of this article is to characterize some large classes of such extremals. In particular, we show that there many other extremals than the gaussians, thus disproving a conjecture of G. Choquet and that no reasonable conjecture can be made on the full set of extremals. The last feature of this article is to show that many characterizations of positive definite functions available in the literature are actually particular cases of the Choquet integral representations we obtain.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 10:36:37 GMT" } ]
2009-10-08T00:00:00
[ [ "Jaming", "Philippe", "", "MAPMO" ], [ "Matolcsi", "Maté", "" ], [ "Révesz", "Szilard Gy.", "" ] ]
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801.0942
Almut Beige
Jonathan Busch, Elica S. Kyoseva, Michael Trupke, and Almut Beige
Entangling distant quantum dots using classical interference
5 pages, 5 figures, revised version, new title
Phys. Rev. A 78, 040301(R) (2008)
10.1103/PhysRevA.78.040301
null
cond-mat.mes-hall quant-ph
null
We show that it is possible to employ reservoir engineering to turn two distant and relatively bad cavities into one good cavity with a tunable spontaneous decay rate. As a result, quantum computing schemes, that would otherwise require the shuttling of atomic qubits in and out of an optical resonator, can now be applied to distant quantum dots. To illustrate this we transform a recent proposal to entangle two qubits via the observation of macroscopic fluorescence signals [Metz et al., Phys. Rev. Lett. 97, 040503 (2006)] to the electron-spin states of two semiconductor quantum dots. Our scheme requires neither the coherent control of qubit-qubit interactions nor the detection of single photons. Moreover, the scheme is relatively robust against spin-bath couplings, parameter fluctuations, and the spontaneous emission of photons.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 10:48:10 GMT" }, { "version": "v2", "created": "Wed, 30 Apr 2008 18:52:21 GMT" } ]
2009-11-13T00:00:00
[ [ "Busch", "Jonathan", "" ], [ "Kyoseva", "Elica S.", "" ], [ "Trupke", "Michael", "" ], [ "Beige", "Almut", "" ] ]
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801.0943
Kirtiman Ghosh
Kirtiman Ghosh, Anindya Datta
Phenomenology of spinless adjoints in two Universal Extra Dimensions
20 pages, 10 figures
Nucl.Phys.B800:109-126,2008
10.1016/j.nuclphysb.2008.03.012
null
hep-ph
null
We discuss the phenomenology of $(1,1)$-mode adjoint scalars in the framework of two Universal Extra Dimensions. The Kaluza-Klein (KK) towers of these adjoint scalars arise in the 4-dimensional effective theory from the 6th component of the gauge fields after compactification. Adjoint scalars can have KK-number conserving as well as KK-number violating interactions. We calculate the KK-number violating operators involving these scalars and two Standard Model fields. Decay widths of these scalars into different channels have been estimated. We have also briefly discussed pair-production and single production of such scalars at the Large Hadron Collider.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 11:04:48 GMT" } ]
2008-11-26T00:00:00
[ [ "Ghosh", "Kirtiman", "" ], [ "Datta", "Anindya", "" ] ]
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801.0944
Choon-Lin Ho
Choon-Lin Ho
Prepotential approach to exact and quasi-exact solvabilities of Hermitian and non-Hermitian Hamiltonians
12 pages, no figures. Based on talk presented at "Conference in Honor of CN Yang's 85th Birthday", 31 oct - 3 Nov 2007, Singapore
null
null
null
hep-th math-ph math.MP math.SP quant-ph
null
In this talk I present a simple and unified approach to both exact and quasi-exact solvabilities of the one-dimensional Schr\"odinger equation. It is based on the prepotential together with Bethe ansatz equations. This approach gives the potential as well as the eigenfunctions and eigenvalues simultaneously. In this approach the system is completely defined by the choice of the change of variables, and the so-called zero-th order prepotential. We illustrate the approach by several examples of Hermitian and non-Hermitian Hamiltonians with real energies. The method can be easily extended to the constructions of exactly and quasi-exactly solvable Dirac, Pauli, and Fokker-Planck equations, and to quasinormal modes.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 11:14:02 GMT" } ]
2019-12-06T00:00:00
[ [ "Ho", "Choon-Lin", "" ] ]
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801.0945
Soumen Karmakar
Naveen V. Kulkarni, Soumen Karmakar, Indrani Banerjee, R. Pasricha, S. N. Sahasrabudhe, A. K. Das and S. V. Bhoraskar
DC transferred arc thermal plasma assisted growth of nanoparticles with different crystalline phases
30 pages, 9 figures, 1 table
null
null
null
cond-mat.mtrl-sci
null
The control of the crystalline phases of the nanoparticles grown in a direct-current transferred-arc plasma-assisted reactor is reported. The crystalline phases of the as synthesized nanoparticles are shown to critically depend on the operating gas pressure. The paper reports about the change in the crystalline phases of three distinct compounds namely aluminium oxide (Al2O3), aluminium nitride (AlN) and iron oxide (FexOy). The major outcome of the present work is that the phases having higher defect densities are more probable to form at the sub-atmospheric operating pressure. The variations in the crystalline structures are discussed on the basis of the equilibrium defect density formed during the homogeneous nucleation. The as synthesized nanoparticles were examined by X-ray diffraction analysis and transmission electron microscopy. In addition, the confirmatory analysis for the crystalline phases of the as synthesized iron oxides was carried out with the help of Mossbauer spectroscopy.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 11:22:33 GMT" } ]
2008-01-08T00:00:00
[ [ "Kulkarni", "Naveen V.", "" ], [ "Karmakar", "Soumen", "" ], [ "Banerjee", "Indrani", "" ], [ "Pasricha", "R.", "" ], [ "Sahasrabudhe", "S. N.", "" ], [ "Das", "A. K.", "" ], [ "Bhoraskar", "S. V.", "" ] ]
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801.0946
Jean-Christophe Pain
Jean-Christophe Pain
Benford's law and complex atomic spectra
7 pages, 2 figures. submitted to Physical Review E
null
10.1103/PhysRevE.77.012102
null
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We found that in transition arrays of complex atomic spectra, the strengths of electric-dipolar lines obey Benford's law, which means that their significant digits follow a logarithmic distribution favoring the smallest values. This indicates that atomic processes result from the superposition of uncorrelated probability laws and that the occurrence of digits reflects the constraints induced by the selection rules. Furthermore, Benford's law can be a useful test of theoretical spectroscopic models. Its applicability to the statistics of electric-dipolar lines can be understood in the framework of random matrix theory and is consistent with the Porter-Thomas law.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 11:23:30 GMT" }, { "version": "v2", "created": "Sat, 10 Dec 2022 17:06:36 GMT" } ]
2022-12-13T00:00:00
[ [ "Pain", "Jean-Christophe", "" ] ]
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801.0947
Gongwei Lin
Gong-Wei Lin, Xu-Bo Zou, Ming-Yong Ye, Xiu-Min Lin, and Guang-Can Guo
A scheme for tunable quantum phase gate and effective preparation of graph-state entanglement
7 pages, 5 figures
Phys. Rev. A 77, 032308 (2008)
10.1103/PhysRevA.77.032308
null
quant-ph
null
A scheme is presented for realizing a quantum phase gate with three-level atoms, solid-state qubits--often called artificial atoms, or ions that share a quantum data bus such as a single mode field in cavity QED system or a collective vibrational state of trapped ions. In this scheme, the conditional phase shift is tunable and controllable via the total effective interaction time. Furthermore, we show that the method can be used for effective preparation of graph-state entanglement, which are important resources for quantum computation, quantum error correction, studies of multiparticle entanglement, fundamental tests of non-locality and decoherence.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 11:39:45 GMT" } ]
2009-11-13T00:00:00
[ [ "Lin", "Gong-Wei", "" ], [ "Zou", "Xu-Bo", "" ], [ "Ye", "Ming-Yong", "" ], [ "Lin", "Xiu-Min", "" ], [ "Guo", "Guang-Can", "" ] ]
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801.0948
Bin Xu
Zhi Chen, Yiqian Shi and Bin Xu
The Riemannian manifolds with boundary and large symmetry
The former paper has been replaced by a substantially revised version. Title also changed
null
null
null
math.DG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Sixty years ago, S. B. Myers and N. E. Steenrod ({\it Ann. of Math.} {\bf 40} (1939), 400-416) showed that the isometry group of a Riemannian manifold without boundary has a structure of Lie group. Recently A. V. Bagaev and N. I. Zhukova ({\it Siberian Math. J.} {\bf 48} (2007), 579-592) proved the same result for a Riemannian orbifold. In this paper, we firstly show that the isometry group of a Riemannian manifold $M$ with boundary has dimension at most ${1/2} \dim M (\dim M-1)$. Then we completely classify such Riemannian manifolds with boundary that their isometry groups attain the preceding maximal dimension.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 11:45:06 GMT" }, { "version": "v2", "created": "Mon, 21 Jan 2008 08:14:45 GMT" }, { "version": "v3", "created": "Sat, 9 May 2009 02:43:33 GMT" } ]
2009-05-11T00:00:00
[ [ "Chen", "Zhi", "" ], [ "Shi", "Yiqian", "" ], [ "Xu", "Bin", "" ] ]
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801.0949
Jad Saklawi
Paul C. Attie
On the Refinement of Liveness Properties of Distributed Systems
54 pages, 12 figures
null
null
null
cs.LO
null
We present a new approach for reasoning about liveness properties of distributed systems, represented as automata. Our approach is based on simulation relations, and requires reasoning only over finite execution fragments. Current simulation-relation based methods for reasoning about liveness properties of automata require reasoning over entire executions, since they involve a proof obligation of the form: if a concrete and abstract execution ``correspond'' via the simulation, and the concrete execution is live, then so is the abstract execution. Our contribution consists of (1) a formalism for defining liveness properties, (2) a proof method for liveness properties based on that formalism, and (3) two expressive completeness results: firstly, our formalism can express any liveness property which satisfies a natural ``robustness'' condition, and secondly, our formalism can express any liveness property at all, provided that history variables can be used
[ { "version": "v1", "created": "Mon, 7 Jan 2008 11:55:03 GMT" } ]
2008-01-08T00:00:00
[ [ "Attie", "Paul C.", "" ] ]
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801.095
Franz X. Bronold
F. X. Bronold, H. Fehske, H. Kersten, and H. Deutsch
Surface states and the charge of a dust particle in a plasma
4 pages, 3 figures, slightly revised manuscript including radius dependence of the particle charge
Phys. Rev. Lett. 101, 175002 (2008)
10.1103/PhysRevLett.101.175002
null
physics.plasm-ph physics.space-ph
null
We investigate electron and ion surface states of a negatively charged dust particle in a gas discharge and identify the charge of the particle with the electron surface density bound in the polarization-induced short-range part of the particle potential. On that scale, ions do not affect the charge. They are trapped in the shallow states of the Coulomb tail of the potential and act only as screening charges. Using orbital-motion limited electron charging fluxes and the particle temperature as an adjustable parameter, we obtain excellent agreement with experimental data.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 11:55:27 GMT" }, { "version": "v2", "created": "Thu, 15 May 2008 13:25:55 GMT" } ]
2009-11-13T00:00:00
[ [ "Bronold", "F. X.", "" ], [ "Fehske", "H.", "" ], [ "Kersten", "H.", "" ], [ "Deutsch", "H.", "" ] ]
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801.0951
Jesper Pedersen Mr.
Jesper Pedersen, Christian Flindt, Niels Asger Mortensen, Antti-Pekka Jauho
Designed defects in 2D antidot lattices for quantum information processing
3 pages, 3 figures
Physica E 40, 1075 (2008).
10.1016/j.physe.2007.08.016
null
cond-mat.mes-hall
null
We propose a new physical implementation of spin qubits for quantum information processing, namely defect states in antidot lattices defined in the two-dimensional electron gas at a semiconductor heterostructure. Calculations of the band structure of a periodic antidot lattice are presented. A point defect is created by removing a single antidot, and calculations show that localized states form within the defect, with an energy structure which is robust against thermal dephasing. The exchange coupling between two electrons residing in two tunnel-coupled defect states is calculated numerically. We find results reminiscent of double quantum dot structures, indicating that the suggested structure is a feasible physical implementation of spin qubits.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 12:06:40 GMT" } ]
2008-02-15T00:00:00
[ [ "Pedersen", "Jesper", "" ], [ "Flindt", "Christian", "" ], [ "Mortensen", "Niels Asger", "" ], [ "Jauho", "Antti-Pekka", "" ] ]
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801.0952
Becca Federico
Manuela Capello, Federico Becca, Michele Fabrizio, and Sandro Sorella
Mott transition in bosonic systems: Insights from the variational approach
12 pages and 19 figures. Related to arXiv:0705.2684
Physical Review B 77, 144517 (2008)
10.1103/PhysRevB.77.144517
null
cond-mat.str-el
null
We study the Mott transition occurring for bosonic Hubbard models in one, two, and three spatial dimensions, by means of a variational wave function benchmarked by Green's function Monte Carlo calculations. We show that a very accurate variational wave function, constructed by applying a long-range Jastrow factor to the non-interacting boson ground state, can describe the superfluid-insulator transition in any dimensionality. Moreover, by mapping the quantum averages over such a wave function into the the partition function of a classical model, important insights into the insulating phase are uncovered. Finally, the evidence in favor of anomalous scenarios for the Mott transition in two dimensions are reported whenever additional long-range repulsive interactions are added to the Hamiltonian.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 11:59:11 GMT" } ]
2009-11-13T00:00:00
[ [ "Capello", "Manuela", "" ], [ "Becca", "Federico", "" ], [ "Fabrizio", "Michele", "" ], [ "Sorella", "Sandro", "" ] ]
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801.0953
Rudy Wijnands
Rudy Wijnands
Enigmatic sub-luminous accreting neutron stars in our Galaxy
Conference proceedings from 'A Population Explosion: The Nature and Evolution of X-ray Binaries in Diverse Environments', 28 Oct - 2 Nov, St. Petersburg Beach, FL
AIP Conf.Proc.1010:382-386,2008
10.1063/1.2945081
null
astro-ph
null
During the last few years a class of enigmatic sub-luminous accreting neutron stars has been found in our Galaxy. They have peak X-ray luminosities (2-10 keV) of a few times 1E34 erg/s to a few times 1E35 erg/s, and both persistent and transient sources have been found. I present a short overview of our knowledge of these systems and what we can learn from them.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 12:02:38 GMT" } ]
2009-06-23T00:00:00
[ [ "Wijnands", "Rudy", "" ] ]
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801.0954
Kazuharu Bamba
Kazuharu Bamba and Sergei D. Odintsov
Inflation and late-time cosmic acceleration in non-minimal Maxwell-$F(R)$ gravity and the generation of large-scale magnetic fields
20 pages, no figure, JCAP version
JCAP 0804:024,2008
10.1088/1475-7516/2008/04/024
KU-TP 019
astro-ph gr-qc hep-ph hep-th
null
We study inflation and late-time acceleration in the expansion of the universe in non-minimal electromagnetism, in which the electromagnetic field couples to the scalar curvature function. It is shown that power-law inflation can be realized due to the non-minimal gravitational coupling of the electromagnetic field, and that large-scale magnetic fields can be generated due to the breaking of the conformal invariance of the electromagnetic field through its non-minimal gravitational coupling. Furthermore, it is demonstrated that both inflation and the late-time acceleration of the universe can be realized in a modified Maxwell-$F(R)$ gravity which is consistent with solar system tests and cosmological bounds and free of instabilities. At small curvature typical for current universe the standard Maxwell theory is recovered. We also consider classically equivalent form of non-minimal Maxwell-$F(R)$ gravity, and propose the origin of the non-minimal gravitational coupling function based on renormalization-group considerations.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 12:04:05 GMT" }, { "version": "v2", "created": "Tue, 25 Mar 2008 18:43:48 GMT" } ]
2009-06-23T00:00:00
[ [ "Bamba", "Kazuharu", "" ], [ "Odintsov", "Sergei D.", "" ] ]
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801.0955
Jose Lorenzana
C. Ortix, J. Lorenzana and C. Di Castro
Phase diagram for Coulomb-frustrated phase separation in systems with negative short-range compressibility
4 pages, 3 figures. Improved figures and presentation
Phys. Rev. Lett. 100, 246402 (2008)
10.1103/PhysRevLett.100.246402
null
cond-mat.str-el cond-mat.mtrl-sci cond-mat.soft
null
Using numerical techniques and asymptotic expansions we obtain the phase diagram of a paradigmatic model of Coulomb frustrated phase separation in systems with negative short-range compressibility. The transition from the homogeneous phase to the inhomogeneous phase is generically first order in isotropic three-dimensional systems except for a critical point. Close to the critical point, inhomogeneities are predicted to form a BCC lattice with subsequent transitions to a triangular lattice of rods and a layered structure. Inclusion of a strong anisotropy allows for second- and first-order transition lines joined by a tricritical point.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 12:06:58 GMT" }, { "version": "v2", "created": "Wed, 23 Apr 2008 15:02:24 GMT" } ]
2008-07-10T00:00:00
[ [ "Ortix", "C.", "" ], [ "Lorenzana", "J.", "" ], [ "Di Castro", "C.", "" ] ]
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801.0956
Markus H. Thoma
Markus H. Thoma
Field Theoretic Description of Ultrarelativistic Electron-Positron Plasmas
13 pages, 7 figures, 1 table, published version
Rev.Mod.Phys.81:959-968,2009
10.1103/RevModPhys.81.959
null
physics.plasm-ph astro-ph hep-ph nucl-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Ultrarelativistic electron-positron plasmas can be produced in high-intensity laser fields and play a role in various astrophysical situations. Their properties can be calculated using QED at finite temperature. Here we will use perturbative QED at finite temperature for calculating various important properties, such as the equation of state, dispersion relations of collective plasma modes of photons and electrons, Debye screening, damping rates, mean free paths, collision times, transport coefficients, and particle production rates, of ultrarelativistic electron-positron plasmas. In particular, we will focus on electron-positron plasmas produced with ultra-strong lasers.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 12:07:12 GMT" }, { "version": "v2", "created": "Mon, 6 Jul 2009 13:52:44 GMT" } ]
2014-11-18T00:00:00
[ [ "Thoma", "Markus H.", "" ] ]
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801.0957
Yury Zinoviev
Yury M. Zinoviev
Relativistic Newton and Coulomb Laws
null
null
null
null
math-ph math.MP
null
The relativistic equations for the electromagnetic and gravitation interactions are similar: The only Lagrangian equation is the equation with Lorentz force. The potential satisfies the wave equation with the right - hand side proprtional to the velocity of another particle multiplied by the delta - function concentrated at the position of another particle. If the interaction propagates at the speed of light, then the wave equation has the unique solution: the Lienard - Wiechert potential. The Maxwell equations are completely defined by the obtained relativistic Coulomb law. The Coulomb law and the Newton gravity law differ from each other only in the choice of the constants. If we choose in Coulomb law the electric charges equal to the masses and choose the interaction constant of another sign, then we get Newton gravity law. If we choose in the relativistic Coulomb law the electric charges equal to the masses and choose the interaction constant of another sign, then we get the relativistic Newton gravity law.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 12:14:28 GMT" } ]
2008-01-08T00:00:00
[ [ "Zinoviev", "Yury M.", "" ] ]
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801.0958
Kazem Azizi
T. M. Aliev, K. Azizi, A. Ozpineci
QCD sum rules analysis of the $B_{s}\to D_{sJ}(2460)l\nu $ decay
Talk at the International Conference on Hadron Physics TROIA'07, 30 Aug. - 3 Sept. 2007, Canakkale, Turkey
null
null
null
hep-ph
null
Using three point QCD sum rules method, the form factors relevant to the semileptonic $B_{s}\to D_{sJ}(2460)\ell\nu$ decay are calculated. The $q^2$ dependencies of these form factors are evaluated. The dependence of the asymmetry parameter $\alpha$, characterizing the polarization of $D_{sJ}$ meson, on $q^2$ is studied. This study gives useful information about the structure of the $D_{sJ}$ meson. Finally the branching ratio of this decay is also estimated and is shown that it can be easily detected at LHC.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 12:30:24 GMT" } ]
2008-01-08T00:00:00
[ [ "Aliev", "T. M.", "" ], [ "Azizi", "K.", "" ], [ "Ozpineci", "A.", "" ] ]
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801.0959
Hans Behringer
Hans Behringer, Andreas Degenhard, Friederike Schmid
Coarse-grained lattice model for investigating the role of cooperativity in molecular recognition
12 pages, 7 figures
Phys. Rev. E 76, 031914 (2007)
10.1103/PhysRevE.76.031914
null
physics.bio-ph
null
Equilibrium aspects of molecular recognition of rigid biomolecules are investigated using coarse-grained lattice models. The analysis is carried out in two stages. First an ensemble of probe molecules is designed with respect to the target biomolecule. The recognition ability of the probe ensemble is then investigated by calculating the free energy of association. The influence of cooperative and anti-cooperative effects accompanying the association of the target and probe molecules is studied. Numerical findings are presented and compared to analytical results which can be obtained in the limit of dominating cooperativity and in the mean-field formulation of the models.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 12:34:23 GMT" } ]
2009-11-13T00:00:00
[ [ "Behringer", "Hans", "" ], [ "Degenhard", "Andreas", "" ], [ "Schmid", "Friederike", "" ] ]
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801.096
Lorenzo Natalucci Dr.
L. Natalucci, M. Feroci, E. Quadrini, P. Ubertini, L. Piro, J.W. den Herder, D. Barret, L. Amati, C. Budtz-Jorgensen, E. Caroli, S. Di Cosimo, M. Frutti, C. Labanti, F. Monzani, J.M. Poulsen, L. Nicolini, A. Stevoli
Design of a CZT Gamma-Camera for GRB and Fast Transient Follow-up: a Wide-Field-Monitor for the EDGE Mission
9 pages, 7 figures, SPIE Conference on UV, X-ray, and Gamma-Ray Instrumentation for Astronomy, San Diego 26-30 August 2007
Proc.SPIE Int.Soc.Opt.Eng.6686:66860T,2007
10.1117/12.734522
null
astro-ph
null
The success of the SWIFT/BAT and INTEGRAL missions has definitely opened a new window for follow-up and deep study of the transient gamma-ray sky. This now appears as the access key to important progresses in the area of cosmological research and deep understanding of the physics of compact objects. To detect in near real-time explosive events like Gamma-Ray bursts, thermonuclear flashes from Neutron Stars and other types of X-ray outbursts we have developed a concept for a wide-field gamma-ray coded mask instrument working in the range 8-200 keV, having a sensitivity of 0.4 ph cm-2 s-1 in 1s (15-150 keV) and arcmin location accuracy over a sky region as wide as 3sr. This scientific requirement can be achieved by means of two large area, high spatial resolution CZT detection planes made of arrays of relatively large (~1cm2) crystals, which are in turn read out as matrices of smaller pixels. To achieve such a wide Field-Of-View the two units can be placed at the sides of a S/C platform serving a payload with a complex of powerful X-ray instruments, as designed for the EDGE mission. The two units will be equipped with powerful signal read out system and data handling electronics, providing accurate on-board reconstruction of the source positions for fast, autonomous target acquisition by the X-ray telescopes.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 12:34:59 GMT" } ]
2009-06-25T00:00:00
[ [ "Natalucci", "L.", "" ], [ "Feroci", "M.", "" ], [ "Quadrini", "E.", "" ], [ "Ubertini", "P.", "" ], [ "Piro", "L.", "" ], [ "Herder", "J. W. den", "" ], [ "Barret", "D.", "" ], [ "Amati", "L.", "" ], [ "Budtz-Jorgensen", "C.", "" ], [ "Caroli", "E.", "" ], [ "Di Cosimo", "S.", "" ], [ "Frutti", "M.", "" ], [ "Labanti", "C.", "" ], [ "Monzani", "F.", "" ], [ "Poulsen", "J. M.", "" ], [ "Nicolini", "L.", "" ], [ "Stevoli", "A.", "" ] ]
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801.0961
Jerome Rodriguez
Jerome Rodriguez, Arash Bodaghee
The Galactic population of HMXBs as seen with INTEGRAL during its four first years of activity
5 pages, 3 figures proceedings of "A population explosion: the nature and evolution of X-ray binaries in diverse environments", conference held in St.Petersburg Beach, Florida; R.M.Bandyopadhyay, S.Wachter, D.Gelino, C.R.Gelino, eds
null
10.1063/1.2945046
null
astro-ph
null
We collected the parameters (position, absorption, spin, orbital period, etc..), when known, of all Galactic sources detected by INTEGRAL during its four first years of activity. We use these parameters to test theoretical predictions. For example, it is clear that HMXBs tend to be found mostly in the tangential direction of the Galactic arms, while LMXBs tend to be clustered in the Galactic bulge. We then focus on HMXBs and present two possible new tools, in addition to the well-known ``Corbet-diagram'', to distinguish between Be-HMXBs and Sg-HMXBs
[ { "version": "v1", "created": "Mon, 7 Jan 2008 12:41:54 GMT" } ]
2009-11-13T00:00:00
[ [ "Rodriguez", "Jerome", "" ], [ "Bodaghee", "Arash", "" ] ]
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801.0962
Gabor Takacs
G. Takacs
Form factors of boundary exponential operators in the sinh-Gordon model
22 pages, LaTeX2e file
null
10.1016/j.nuclphysb.2008.01.025
ITP-Budapest Report No. 637
hep-th cond-mat.other
null
Using the recently introduced boundary form factor bootstrap equations, the form factors of boundary exponential operators in the sinh-Gordon model are constructed. The ultraviolet scaling dimension and the normalization of these operators are checked against previously known results. The construction presented in this paper can be applied to determine form factors of relevant primary boundary operators in general integrable boundary quantum field theories.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 12:53:08 GMT" } ]
2009-11-13T00:00:00
[ [ "Takacs", "G.", "" ] ]
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801.0963
Robert Brignall
Robert Brignall
A Survey of Simple Permutations
21 pages, 6 figures
null
null
null
math.CO
null
We survey the known results about simple permutations. In particular, we present a number of recent enumerative and structural results pertaining to simple permutations, and show how simple permutations play an important role in the study of permutation classes. We demonstrate how classes containing only finitely many simple permutations satisfy a number of special properties relating to enumeration, partial well-order and the property of being finitely based.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 12:48:34 GMT" }, { "version": "v2", "created": "Fri, 18 Apr 2008 18:45:06 GMT" } ]
2008-04-18T00:00:00
[ [ "Brignall", "Robert", "" ] ]
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801.0964
J. S. Kaastra
J.S. Kaastra, A.M. Bykov, S. Schindler, J.A.M. Bleeker, S. Borgani, A. Diaferio, K. Dolag, F. Durret, J. Nevalainen, T. Ohashi, F.B.S. Paerels, V. Petrosian, Y. Rephaeli, P. Richter, J. Schaye, N. Werner
Clusters of galaxies: beyond the thermal view
6 pages, 1 figure, accepted for publication in Space Science Reviews, special issue "Clusters of galaxies: beyond the thermal view", Editor J.S. Kaastra, Chapter 1; work done by an international team at the International Space Science Institute (ISSI), Bern, organised by J.S. Kaastra, A.M. Bykov, S. Schindler & J.A.M. Bleeker
null
10.1007/s11214-008-9326-3
null
astro-ph
null
We present the work of an international team at the International Space Science Institute (ISSI) in Bern that worked together to review the current observational and theoretical status of the non-virialised X-ray emission components in clusters of galaxies. The subject is important for the study of large-scale hierarchical structure formation and to shed light on the "missing baryon" problem. The topics of the team work include thermal emission and absorption from the warm-hot intergalactic medium, non-thermal X-ray emission in clusters of galaxies, physical processes and chemical enrichment of this medium and clusters of galaxies, and the relationship between all these processes. One of the main goals of the team is to write and discuss a series of review papers on this subject. These reviews are intended as introductory text and reference for scientists wishing to work actively in this field. The team consists of sixteen experts in observations, theory and numerical simulations.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 12:51:58 GMT" } ]
2009-11-13T00:00:00
[ [ "Kaastra", "J. S.", "" ], [ "Bykov", "A. M.", "" ], [ "Schindler", "S.", "" ], [ "Bleeker", "J. A. M.", "" ], [ "Borgani", "S.", "" ], [ "Diaferio", "A.", "" ], [ "Dolag", "K.", "" ], [ "Durret", "F.", "" ], [ "Nevalainen", "J.", "" ], [ "Ohashi", "T.", "" ], [ "Paerels", "F. B. S.", "" ], [ "Petrosian", "V.", "" ], [ "Rephaeli", "Y.", "" ], [ "Richter", "P.", "" ], [ "Schaye", "J.", "" ], [ "Werner", "N.", "" ] ]
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801.0965
Rodolfo Smiljanic
R. Smiljanic (1,2), L. Pasquini (2), F. Primas (2), P. Mazzali (3,4), D. Galli (5), G. Valle (6) ((1) Universidade de Sao Paulo - Brazil, (2) ESO - Germany, (3) Max-Planck Institut fur Astrophysik - Germany, (4) Osservatorio Astronomico de Trieste - Italy, (5) Osservatorio Astrofisico di Arcetri - Italy, (6) Universita di Pisa - Italy)
Possible signature of hypernova nucleosynthesis in a beryllium rich halo dwarf
Accepted for publication in the MNRAS letters
null
10.1111/j.1745-3933.2008.00440.x
null
astro-ph
null
As part of a large survey of halo and thick disc stars, we found one halo star, HD 106038, exceptionally overabundant in beryllium. In spite of its low metallicity, [Fe/H] = -1.26, the star has log(Be/H) = -10.60, which is similar to the solar meteoritic abundance, log(Be/H) = -10.58. This abundance is more than ten times higher the abundance of stars with similar metallicity and cannot be explained by models of chemical evolution of the Galaxy that include the standard theory of cosmic-ray spallation. No other halo star exhibiting such a beryllium overabundance is known. In addition, overabundances of Li, Si, Ni, Y, and Ba are also observed. We suggest that all these chemical peculiarities, but the Ba abundance, can be simultaneously explained if the star was formed in the vicinity of a hypernova.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 12:52:03 GMT" } ]
2009-11-13T00:00:00
[ [ "Smiljanic", "R.", "" ], [ "Pasquini", "L.", "" ], [ "Primas", "F.", "" ], [ "Mazzali", "P.", "" ], [ "Galli", "D.", "" ], [ "Valle", "G.", "" ] ]
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801.0966
Magnus Borgh
M. Borgh, M. Koskinen, J. Christensson, M. Manninen, S. M. Reimann
Universality of Many-Body States in Rotating Bose and Fermi Systems
9 pages, 9 figures
null
10.1103/PhysRevA.77.033615
null
cond-mat.mes-hall cond-mat.other
null
We propose a universal transformation from a many-boson state to a corresponding many-fermion state in the lowest Landau level approximation of rotating many-body systems, inspired by the Laughlin wave function and by the Jain composite-fermion construction. We employ the exact-diagonalization technique for finding the many-body states. The overlap between the transformed boson ground state and the true fermion ground state is calculated in order to measure the quality of the transformation. For very small and high angular momenta, the overlap is typically above 90%. For intermediate angular momenta, mixing between states complicates the picture and leads to small ground-state overlaps at some angular momenta.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 12:55:11 GMT" } ]
2009-11-13T00:00:00
[ [ "Borgh", "M.", "" ], [ "Koskinen", "M.", "" ], [ "Christensson", "J.", "" ], [ "Manninen", "M.", "" ], [ "Reimann", "S. M.", "" ] ]
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801.0967
Marie Th\'eret
Rapha\"el Rossignol and Marie Th\'eret
Lower large deviations and laws of large numbers for maximal flows through a box in first passage percolation
39 pages, 4 figures; improvement of the moment conditions and introduction of new results in the revised version
null
null
null
math.PR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider the standard first passage percolation model in $\mathbb{Z}^d$ for $d\geq 2$. We are interested in two quantities, the maximal flow $\tau$ between the lower half and the upper half of the box, and the maximal flow $\phi$ between the top and the bottom of the box. A standard subadditive argument yields the law of large numbers for $\tau$ in rational directions. Kesten and Zhang have proved the law of large numbers for $\tau$ and $\phi$ when the sides of the box are parallel to the coordinate hyperplanes: the two variables grow linearly with the surface $s$ of the basis of the box, with the same deterministic speed. We study the probabilities that the rescaled variables $\tau /s$ and $\phi /s$ are abnormally small. For $\tau$, the box can have any orientation, whereas for $\phi$, we require either that the box is sufficiently flat, or that its sides are parallel to the coordinate hyperplanes. We show that these probabilities decay exponentially fast with $s$, when $s$ grows to infinity. Moreover, we prove an associated large deviation principle of speed $s$ for $\tau /s$ and $\phi /s$, and we improve the conditions required to obtain the law of large numbers for these variables.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 13:28:08 GMT" }, { "version": "v2", "created": "Fri, 3 Jul 2009 13:36:56 GMT" } ]
2009-07-03T00:00:00
[ [ "Rossignol", "Raphaël", "" ], [ "Théret", "Marie", "" ] ]
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801.0968
J. S. Kaastra
A. Diaferio, S. Schindler, K. Dolag
Clusters of galaxies: setting the stage
20 pages, 8 figures, accepted for publication in Space Science Reviews, special issue "Clusters of galaxies: beyond the thermal view", Editor J.S. Kaastra, Chapter 2; work done by an international team at the International Space Science Institute (ISSI), Bern, organised by J.S. Kaastra, A.M. Bykov, S. Schindler & J.A.M. Bleeker
null
10.1007/s11214-008-9324-5
null
astro-ph
null
Clusters of galaxies are self-gravitating systems of mass ~10^14-10^15 Msun. They consist of dark matter (~80 %), hot diffuse intracluster plasma (< 20 %) and a small fraction of stars, dust, and cold gas, mostly locked in galaxies. In most clusters, scaling relations between their properties testify that the cluster components are in approximate dynamical equilibrium within the cluster gravitational potential well. However, spatially inhomogeneous thermal and non-thermal emission of the intracluster medium (ICM), observed in some clusters in the X-ray and radio bands, and the kinematic and morphological segregation of galaxies are a signature of non-gravitational processes, ongoing cluster merging and interactions. In the current bottom-up scenario for the formation of cosmic structure, clusters are the most massive nodes of the filamentary large-scale structure of the cosmic web and form by anisotropic and episodic accretion of mass. In this model of the universe dominated by cold dark matter, at the present time most baryons are expected to be in a diffuse component rather than in stars and galaxies; moreover, ~50 % of this diffuse component has temperature ~0.01-1 keV and permeates the filamentary distribution of the dark matter. The temperature of this Warm-Hot Intergalactic Medium (WHIM) increases with the local density and its search in the outer regions of clusters and lower density regions has been the quest of much recent observational effort. Over the last thirty years, an impressive coherent picture of the formation and evolution of cosmic structures has emerged from the intense interplay between observations, theory and numerical experiments. Future efforts will continue to test whether this picture keeps being valid, needs corrections or suffers dramatic failures in its predictive power.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 13:35:40 GMT" } ]
2009-11-13T00:00:00
[ [ "Diaferio", "A.", "" ], [ "Schindler", "S.", "" ], [ "Dolag", "K.", "" ] ]
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801.0969
Javier Gonz\'alez Est\'evez
J. Gonzalez-Estevez, M. G. Cosenza, R. Lopez-Ruiz, and J. R. Sanchez
Pareto and Boltzmann-Gibbs behaviors in a deterministic multi-agent system
9 pages, 9 color .eps figures, submitted to Physica A
null
10.1016/j.physa.2008.03.013
null
q-fin.GN cond-mat.stat-mech cs.MA nlin.AO nlin.CD physics.comp-ph physics.soc-ph
null
A deterministic system of interacting agents is considered as a model for economic dynamics. The dynamics of the system is described by a coupled map lattice with near neighbor interactions. The evolution of each agent results from the competition between two factors: the agent's own tendency to grow and the environmental influence that moderates this growth. Depending on the values of the parameters that control these factors, the system can display Pareto or Boltzmann-Gibbs statistical behaviors in its asymptotic dynamical regime. The regions where these behaviors appear are calculated on the space of parameters of the system. Other statistical properties, such as the mean wealth, the standard deviation, and the Gini coefficient characterizing the degree of equity in the wealth distribution are also calculated on the space of parameters of the system.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 13:15:16 GMT" } ]
2009-11-13T00:00:00
[ [ "Gonzalez-Estevez", "J.", "" ], [ "Cosenza", "M. G.", "" ], [ "Lopez-Ruiz", "R.", "" ], [ "Sanchez", "J. R.", "" ] ]
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801.097
Nathalie Akakpo
Nathalie Akakpo
Detecting change-points in a discrete distribution via model selection
Submitted to the Electronic Journal of Statistics (http://www.i-journals.org/ejs/) by the Institute of Mathematical Statistics (http://www.imstat.org)
null
null
IMS-EJS-EJS_2008_170
math.ST stat.TH
null
This paper is concerned with the detection of multiple change-points in the joint distribution of independent categorical variables. The procedures introduced rely on model selection and are based on a penalized least-squares criterion. Their performance is assessed from a nonasymptotic point of view. Using a special collection of models, a preliminary estimator is built. According to an existing model selection theorem, it satisfies an oracle-type inequality. Moreover, thanks to an approximation result demonstrated in this paper, it is also proved to be adaptive in the minimax sense. In order to eliminate some irrelevant change-points selected by that first estimator, a two-stage procedure is proposed, that also enjoys some adaptivity property. Besides, the first estimator can be computed with a complexity only linear in the size of the data. A heuristic method allows to implement the second procedure quite satisfactorily with the same computational complexity.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 13:17:05 GMT" } ]
2008-01-08T00:00:00
[ [ "Akakpo", "Nathalie", "" ] ]
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801.0971
Matthias Maercker
Matthias Maercker, Fredrik L. Schoeier, Hans Olofsson, Per Bergman, Sofia Ramstedt
Circumstellar water vapour in M-type AGB stars: Radiative transfer models, abundances and predictions for HIFI
Accepted by A&A, Dec 12 2007, 13 pages, 8 figures, correct affiliation address
null
10.1051/0004-6361:20078680
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Aims: By performing a detailed radiative transfer analysis, we determine fractional abundances of circumstellar H2O in the envelopes around six M-type asymptotic giant branch stars. The models are also used to predict H2O spectral line emission for the upcoming Herschel/HIFI mission. Methods: We use Infrared space observatory long wavelength spectrometer spectra to constrain the circumstellar fractional abundance distribution of ortho-H2O, using a non-local thermal equilibrium, and non-local, radiative transfer code based on the accelerated lambda iteration formalism. The mass-loss rates and kinetic temperature structures for the sample stars are determined through radiative transfer modelling of CO line emission based on the Monte-Carlo method. The density and temperature profiles of the circumstellar dust grains are determined through spectral energy distribution modelling using the publicly available code Dusty. Results: The determined ortho-H2O abundances lie between 1e-4 and 1.5e-3 relative to H2, with the exception of WX Psc, which has a much lower estimated ortho-H2O abundance of only 2e-6, possibly indicating H_2O adsorption onto dust grains or recent mass-loss-rate modulations. The estimated abundances are uncertain by, at best, a factor of a few. Conclusions: The high water abundance found for the majority of the sources suggests that either the `normal' chemical processes are very effective in producing H2O, or else non-local thermal equilibrium atmospheric chemistry, grain surface reactions, or a release of H_2O (e.g. from icy bodies like Kuiper belt objects) play a role. We provide predictions for ortho-H2O lines in the spectral window of Herschel/HIFI.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 13:48:25 GMT" }, { "version": "v2", "created": "Sat, 10 Jan 2009 14:20:31 GMT" }, { "version": "v3", "created": "Wed, 14 Apr 2010 11:58:37 GMT" } ]
2010-04-15T00:00:00
[ [ "Maercker", "Matthias", "" ], [ "Schoeier", "Fredrik L.", "" ], [ "Olofsson", "Hans", "" ], [ "Bergman", "Per", "" ], [ "Ramstedt", "Sofia", "" ] ]
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801.0972
Philippe Lebacque
Philippe Lebacque
On Tsfasman--Vl\u{a}du\c{t} Invariants of Infinite Global Fields
null
null
null
null
math.NT
null
In this article we study certain asymptotic properties of global fields. We consider the set of Tsfasman-Vladuts invariants of infinite global fields and answer some natural questions arising from their work. In particular, we prove the existence of infinite global fields having finitely many strictly positive invariants at given places, and the existence of infinite number fields with certain prescribed invariants being zero. We also give precisions on the deficiency of infinite global fields and on the primes decomposition in those fields.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 13:38:15 GMT" } ]
2008-01-08T00:00:00
[ [ "Lebacque", "Philippe", "" ] ]
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