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711.2108
Kallosh Renata
Renata Kallosh
The Effective Action of N=8 Supergravity
17 pages
null
null
null
hep-th
null
We present a simple form of the on-shell gauge-invariant 1-loop effective action of N=8 supergravity which is manifestly N=8 supersymmetric at the linear level. By generalizing the dimensional arguments in superspace to non-local invariants, we show that the 1-loop effective action does not contain any contributions from bubble and triangle diagrams. The absence of bubbles implies the absence of conformal and axial anomalies. We also show that the 1-loop effective action of N=8 supergravity features a "dual" conformal symmetry in the momentum space.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 20:22:54 GMT" } ]
2007-11-15T00:00:00
[ [ "Kallosh", "Renata", "" ] ]
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711.2109
Floris van der Tak
Floris van der Tak (SRON Groningen), Susanne Aalto (Onsala), Rowin Meijerink (Berkeley)
Detection of extragalactic H3O+
Accepted by A&A Letters; 4-5 pages depending on paper format; two b/w figures
null
10.1051/0004-6361:20078824
null
astro-ph
null
The H3O+ molecule probes the oxygen chemistry and the ionization rate of dense circumnuclear gas in galaxies. In particular, recent H3O+ observations show variations in the cosmic-ray ionization rate by factors of $>$10 within our Galaxy. Using the JCMT, we have observed the 364 GHz line of p-H3O+ in the centers of M82 and Arp 220. In Arp 220, the line profile suggests that the emission originates in the Western nucleus. In M82, both the eastern molecular peak and the circumnuclear region contribute to the emission. The derived column densities, abundances, and H3O+ / H2O ratios indicate ionization rates similar to or even exceeding that in the Galactic Center. Model calculations of the chemistry of irradiated molecular gas indicate a likely origin of this high ionization rate in the extended, evolved starburst of M82. In contrast, irradiation by X-rays from the AGN disk is the most likely model for Arp 220.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 15:48:00 GMT" } ]
2009-11-13T00:00:00
[ [ "van der Tak", "Floris", "", "SRON Groningen" ], [ "Aalto", "Susanne", "", "Onsala" ], [ "Meijerink", "Rowin", "", "Berkeley" ] ]
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711.211
Fumiko Yamada
Fumiko Yamada, Toshio Ono, Hidekazu Tanaka, Gregoire Misguich, Masaki Oshikawa and Toshiro Sakakibara
Magnetic-Field Induced Bose-Einstein Condensation of Magnons and Critical Behavior in Interacting Spin Dimer System TlCuCl$_3$
5 pages, 6 figures, to appear in J. Phys. Soc. Jpn. Vol.77 No.1
null
10.1143/JPSJ.77.013701
null
cond-mat.str-el
null
Magnetization measurements were performed to investigate the critical behavior of the field-induced magnetic ordering in gapped spin system TlCuCl$_3$. The critical density of the magnons was obtained as a function of temperature and the magnon-magnon interaction constant was evaluated. The experimental phase boundary for $T < 5$ K agrees almost perfectly with the magnon BEC theory based on the Hartree-Fock approximation with realistic dispersion relations. The phase boundary can be described by the power law $[H_{N}(T)-H_{c}] propto T^{phi}$. With decreasing fitting temperature range, the critical exponent ${phi}$ decreases and converges at $phi_{BEC} =3/2$ predicted by the magnon BEC theory.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 05:44:27 GMT" } ]
2015-05-13T00:00:00
[ [ "Yamada", "Fumiko", "" ], [ "Ono", "Toshio", "" ], [ "Tanaka", "Hidekazu", "" ], [ "Misguich", "Gregoire", "" ], [ "Oshikawa", "Masaki", "" ], [ "Sakakibara", "Toshiro", "" ] ]
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711.2111
Joseph Rhee
Joseph H. Rhee, Inseok Song, B. Zuckerman
Warm dust in the terrestrial planet zone of a sun-like Pleiad: collisions between planetary embryos?
ApJ in press, 19 pages including 3 figures and 2 tables, minor changes to the tables and figures
null
10.1086/524935
null
astro-ph
null
Only a few solar-type main sequence stars are known to be orbited by warm dust particles; the most extreme is the G0 field star BD+20 307 that emits ~4% of its energy at mid-infrared wavelengths. We report the identification of a similarly dusty star HD 23514, an F6-type member of the Pleiades cluster. A strong mid-IR silicate emission feature indicates the presence of small warm dust particles, but with the primary flux density peak at the non-standard wavelength of ~9 micron. The existence of so much dust within an AU or so of these stars is not easily accounted for given the very brief lifetime in orbit of small particles. The apparent absence of very hot (>~1000 K) dust at both stars suggests the possible presence of a planet closer to the stars than the dust. The observed frequency of the BD+20 307/HD 23514 phenomenon indicates that the mass equivalent of Earth's Moon must be converted, via collisions of massive bodies, to tiny dust particles that find their way to the terrestrial planet zone during the first few hundred million years of the life of many (most?) sun-like stars. Identification of these two dusty systems among youthful nearby solar-type stars suggests that terrestrial planet formation is common.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 05:58:52 GMT" }, { "version": "v2", "created": "Mon, 25 Feb 2008 18:59:20 GMT" } ]
2009-11-13T00:00:00
[ [ "Rhee", "Joseph H.", "" ], [ "Song", "Inseok", "" ], [ "Zuckerman", "B.", "" ] ]
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711.2112
Michel Grabisch
Michel Grabisch (CES), Christophe Labreuche (TRT)
Bi-capacities -- Part II: the Choquet integral
null
Fuzzy Sets and Systems (2005) 237-259
null
null
cs.DM cs.GT
null
Bi-capacities arise as a natural generalization of capacities (or fuzzy measures) in a context of decision making where underlying scales are bipolar. They are able to capture a wide variety of decision behaviours, encompassing models such as Cumulative Prospect Theory (CPT). The aim of this paper in two parts is to present the machinery behind bi-capacities, and thus remains on a rather theoretical level, although some parts are firmly rooted in decision theory, notably cooperative game theory. The present second part focuses on the definition of Choquet integral. We give several expressions of it, including an expression w.r.t. the M\"obius transform. This permits to express the Choquet integral for 2-additive bi-capacities w.r.t. the interaction index.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 06:11:57 GMT" } ]
2007-11-15T00:00:00
[ [ "Grabisch", "Michel", "", "CES" ], [ "Labreuche", "Christophe", "", "TRT" ] ]
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711.2113
Martin Gaskell
C. Martin Gaskell
Accretion Disks and the Nature and Origin of AGN Continuum Variability
Invited talk given at "The Nuclear Region, Host Galaxy, and Environment of Active Galaxies", Huatulco, Mexico, April 2007. To appear in Rev. Mex. A&A Conf. Ser. 11 pages, 7 figures
null
null
null
astro-ph
null
Theory and observations of the dominant thermal continuum emission in AGNs are examined. After correction for reddening, the steady state AGN optical--UV spectral energy distributions (SEDs) are very similar. The SEDs are dominated energetically by the big blue bump (BBB), but this bump never shows the nu^{+1/3} spectrum predicted for a standard thin accretion disk with a r^{-0.75} radial temperature gradient. Instead, the observed optical-UV SED implies a temperature gradient of r^{-0.57} independent of the thickness of the disk. This means that there is some flow of heat outwards in the disk. The disk is large and the region emitting the optical continuum is as large as the inner broad-line region (BLR). Because optical variability is seen in all AGNs on the light-crossing time of the BLR, variations must propagate at close to the speed of light, rather than on dynamical timescales. This argues that the energy-generation mechanism is electromagnetic rather that hydrodynamic. Since the velocities are near the speed of light, there can be significant local anisotropy in the emission. The large rapid variations of the BBB imply that the magnetohydrodynamic energy generation is fundamentally unstable. Because of the inevitable radial temperature gradient in the accreting material, different spectral regions come predominantly from different radii, and variations in different spectral regions correspond to variability at different radii. This explains the frequently observed independence of X-ray and optical variations, cases of variability at lower energies leading variability at higher energies, and rapid changes in emission-line reverberation lags. Some observational tests of the local variability hypothesis are proposed.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 06:12:27 GMT" } ]
2007-11-15T00:00:00
[ [ "Gaskell", "C. Martin", "" ] ]
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711.2114
Michel Grabisch
Michel Grabisch (CES), Christophe Labreuche (TRT)
Bi-capacities -- Part I: definition, M\"obius transform and interaction
null
Fuzzy Sets and Systems (2005) 211-236
null
null
cs.DM cs.GT
null
Bi-capacities arise as a natural generalization of capacities (or fuzzy measures) in a context of decision making where underlying scales are bipolar. They are able to capture a wide variety of decision behaviours, encompassing models such as Cumulative Prospect Theory (CPT). The aim of this paper in two parts is to present the machinery behind bi-capacities, and thus remains on a rather theoretical level, although some parts are firmly rooted in decision theory, notably cooperative game theory. The present first part is devoted to the introduction of bi-capacities and the structure on which they are defined. We define the M\"obius transform of bi-capacities, by just applying the well known theory of M\" obius functions as established by Rota to the particular case of bi-capacities. Then, we introduce derivatives of bi-capacities, by analogy with what was done for pseudo-Boolean functions (another view of capacities and set functions), and this is the key point to introduce the Shapley value and the interaction index for bi-capacities. This is done in a cooperative game theoretic perspective. In summary, all familiar notions used for fuzzy measures are available in this more general framework.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 06:15:05 GMT" } ]
2007-11-15T00:00:00
[ [ "Grabisch", "Michel", "", "CES" ], [ "Labreuche", "Christophe", "", "TRT" ] ]
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711.2115
Michel Grabisch
Michel Grabisch (CES), Christophe Labreuche (TRT)
Derivative of functions over lattices as a basis for the notion of interaction between attributes
null
Annals of Mathematics and Artificial Intelligence 49 (2007) 151-170
null
null
cs.DM cs.GT
null
The paper proposes a general notion of interaction between attributes, which can be applied to many fields in decision making and data analysis. It generalizes the notion of interaction defined for criteria modelled by capacities, by considering functions defined on lattices. For a given problem, the lattice contains for each attribute the partially ordered set of remarkable points or levels. The interaction is based on the notion of derivative of a function defined on a lattice, and appears as a generalization of the Shapley value or other probabilistic values.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 06:15:49 GMT" } ]
2007-11-15T00:00:00
[ [ "Grabisch", "Michel", "", "CES" ], [ "Labreuche", "Christophe", "", "TRT" ] ]
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711.2116
Frederic Vignat
Fr\'ed\'eric Vignat (LGS), Fran\c{c}ois Villeneuve (LGS)
A numerical approach for 3D manufacturing tolerances synthesis
null
Dans Proceedings of the 10th CIRP International Seminar on Computer Aided Tolerancing - 10th CIRP International Seminar on Computer Aided Tolerancing, Erlangen : Allemagne (2007)
null
null
cs.CE
null
Making a product conform to the functional requirements indicated by the customer suppose to be able to manage the manufacturing process chosen to realise the parts. A simulation step is generally performed to verify that the expected generated deviations fit with these requirements. It is then necessary to assess the actual deviations of the process in progress. This is usually done by the verification of the conformity of the workpiece to manufacturing tolerances at the end of each set-up. It is thus necessary to determine these manufacturing tolerances. This step is called "manufacturing tolerance synthesis". In this paper, a numerical method is proposed to perform 3D manufacturing tolerances synthesis. This method uses the result of the numerical analysis of tolerances to determine influent mall displacement of surfaces. These displacements are described by small displacements torsors. An algorithm is then proposed to determine suitable ISO manufacturing tolerances.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 06:21:17 GMT" } ]
2007-11-15T00:00:00
[ [ "Vignat", "Frédéric", "", "LGS" ], [ "Villeneuve", "François", "", "LGS" ] ]
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711.2117
Vasily E. Tarasov
Vasily E. Tarasov
Fractional Stability
5 pages, LaTeX
null
null
null
physics.class-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A fractional generalization of variations is used to define a stability of non-integer order. Fractional variational derivatives are suggested to describe the properties of dynamical systems at fractional perturbations. We formulate stability with respect to motion changes at fractional changes of variables. Note that dynamical systems, which are unstable "in sense of Lyapunov", can be stable with respect to fractional variations.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 06:37:17 GMT" }, { "version": "v2", "created": "Wed, 20 Jul 2011 08:47:20 GMT" }, { "version": "v3", "created": "Sat, 23 Jul 2011 11:39:31 GMT" } ]
2011-07-26T00:00:00
[ [ "Tarasov", "Vasily E.", "" ] ]
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711.2118
Alberica Toia Dr
Alberica Toia (for the PHENIX Collaboration)
Measurements of dilepton continuum at the PHENIX experiment at RHIC
14 pages, 9 figures, proceedings of CPOD conference
PoS CPOD07:037,2007
null
null
nucl-ex
null
PHENIX has measured the dielectron continuum in sqrt(s_(NN))=200 GeV Au+Au and p+p collisions. In minimum bias Au+Au collisions the dielectron yield in the mass range between 150 and 750 MeV/c^2 is enhanced by a factor of 3.4 +/- 0.2(stat.) +/- 1.3(syst.) +/- 0.7(model) compared to the expectation from our model of hadron decays that well reproduces the mass spectrum in p+p collisions. The integrated yield increases faster with the centrality of the collisions than the number of participating nucleons, suggesting emission from scattering processes in the dense medium. The continuum yield between the masses of the phi and the J/psi meson is consistent with expectations from correlated ccbar production, though other mechanisms are not ruled out.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 07:16:04 GMT" }, { "version": "v2", "created": "Wed, 21 Nov 2007 16:48:12 GMT" } ]
2019-08-13T00:00:00
[ [ "Toia", "Alberica", "", "for the PHENIX Collaboration" ] ]
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711.2119
Nicolas Verzelen
Nicolas Verzelen (INRIA Futurs), Fanny Villers (MIA)
Goodness-of-fit Tests for high-dimensional Gaussian linear models
null
null
null
RR-6354
math.ST stat.TH
null
Let $(Y,(X_i)_{i\in\mathcal{I}})$ be a zero mean Gaussian vector and $V$ be a subset of $\mathcal{I}$. Suppose we are given $n$ i.i.d. replications of the vector $(Y,X)$. We propose a new test for testing that $Y$ is independent of $(X_i)_{i\in \mathcal{I}\backslash V}$ conditionally to $(X_i)_{i\in V}$ against the general alternative that it is not. This procedure does not depend on any prior information on the covariance of $X$ or the variance of $Y$ and applies in a high-dimensional setting. It straightforwardly extends to test the neighbourhood of a Gaussian graphical model. The procedure is based on a model of Gaussian regression with random Gaussian covariates. We give non asymptotic properties of the test and we prove that it is rate optimal (up to a possible $\log(n)$ factor) over various classes of alternatives under some additional assumptions. Besides, it allows us to derive non asymptotic minimax rates of testing in this setting. Finally, we carry out a simulation study in order to evaluate the performance of our procedure.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 06:53:15 GMT" }, { "version": "v2", "created": "Thu, 15 Nov 2007 13:01:20 GMT" }, { "version": "v3", "created": "Wed, 5 Dec 2007 16:03:49 GMT" }, { "version": "v4", "created": "Fri, 23 May 2008 11:21:40 GMT" } ]
2008-05-23T00:00:00
[ [ "Verzelen", "Nicolas", "", "INRIA Futurs" ], [ "Villers", "Fanny", "", "MIA" ] ]
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711.212
Takashi Fujita
S. G. Tan, M. B. A. Jalil, X. -J. Liu, T. Fujita
Non-Abelian gauge field effects and its relevance to spinning particle dynamics in the technology of spintronics
11 pages, 1 figure
null
null
null
quant-ph cond-mat.mes-hall
null
We describe formally the precession of spin vector about the k-space effective magnetic field in condensed matter system with spin orbital effects as constituting a local transformation of the electron wavefunction which necessarily invokes the SU(2) transformation rule to ensure covariance. We showed a "no-precession" condition as pre-requisite for the spin gauge field to exert its influence on spin particle motion. The effects of the spin gauge field on spin particle motion were shown to be consistent in both classical and quantum pictures, which hence should underpin theoretical explanations for important effects in anomalous Hall, spin Hall, spin torque, optical Magnus, geometric quantum computation.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 06:59:00 GMT" } ]
2013-04-04T00:00:00
[ [ "Tan", "S. G.", "" ], [ "Jalil", "M. B. A.", "" ], [ "Liu", "X. -J.", "" ], [ "Fujita", "T.", "" ] ]
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711.2121
Rahul Basu
Rahul Basu (IMSc), P. N. Pandita (NEHU) and Chandradew Sharma (IMSc)
Radiative Neutralino Production in Low Energy Supersymmetric Models
LaTeX, 21 pages, 19 figures, figures and text added, version to appear in Phys. Rev. D
Phys.Rev.D77:115009,2008
10.1103/PhysRevD.77.115009
IMSc/2007/11/14
hep-ph
null
We study the production of the lightest neutralinos in the radiative process $e^+e^- \to \tilde\chi^0_1 \tilde\chi^0_1\gamma$ in low energy supersymmetric models for the International Linear Collider energies. This includes the minimal supersymmetric standard model as well as its extension with an additional chiral Higgs singlet superfield, the nonminimal supersymmetric standard model. We compare and contrast the dependence of the signal cross section on the parameters of the neutralino sector of the minimal and nonminimal supersymmetric standard model. We also consider the background to this process coming from the Standard Model process $e^+e^- \to \nu \bar\nu \gamma$, as well as from the radiative production of the scalar partners of the neutrinos (sneutrinos) $e^+e^- \to \tilde\nu \tilde\nu^\ast \gamma$, which can be a background to the radiative neutralino production when the sneutrinos decay invisibly. In low energy supersymmetric models radiative production of the lightest neutralinos may be the only channel to study supersymmetric partners of the Standard Model particles at the first stage of a linear collider, since heavier neutralinos, charginos and sleptons may be too heavy to be pair-produced at a $e^+ e^-$ machine with $\sqrt{s} =500\GeV$.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 07:09:56 GMT" }, { "version": "v2", "created": "Fri, 23 Nov 2007 14:51:32 GMT" }, { "version": "v3", "created": "Tue, 1 Apr 2008 11:05:28 GMT" } ]
2008-11-26T00:00:00
[ [ "Basu", "Rahul", "", "IMSc" ], [ "Pandita", "P. N.", "", "NEHU" ], [ "Sharma", "Chandradew", "", "IMSc" ] ]
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711.2122
Mohammad Sami
R. Chingangbam, M. Sami, P. V. Tretyakov, A.V. Toporensky
A Note on the Viability of Gauss-Bonnet Cosmology
6 latex pages, 4 eps figures, typos corrected and references added, final version to appear in Phys. Lett. B
Phys.Lett.B661:162-166,2008
10.1016/j.physletb.2008.01.070
null
hep-th astro-ph gr-qc hep-ph
null
In this paper, we analyze the viability of a vacuum Gauss-Bonnet cosmology by examining the dynamics of the homogeneous and anisotropic background in 4+1 dimensions. The trajectories of the system either originate from the standard singularity or from non-standard type, the later is characterized by the divergence of time derivative of the Hubble parameters for its finite value. At the onset, the system should relax to Einstein phase at late times as the effect of Gauss-Bonnet term becomes negligible in the low energy regime. However, we find that most of the trajectories emerging from the standard big-bang singularity lead to future re-collapse whereas the system beginning its evolution from the non-standard singularity enters the Kasner regime at late times. This leads to the conclusion that the measure of trajectories giving rise to a smooth evolution from a standard singularity to the Einstein phase is negligibly small for generic initial conditions.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 07:34:11 GMT" }, { "version": "v2", "created": "Fri, 15 Feb 2008 08:50:37 GMT" } ]
2008-11-26T00:00:00
[ [ "Chingangbam", "R.", "" ], [ "Sami", "M.", "" ], [ "Tretyakov", "P. V.", "" ], [ "Toporensky", "A. V.", "" ] ]
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711.2123
Volker Mayer
Volker Mayer and Mariusz Urba\'nski
Ergodic properties of sub-hyperbolic functions with polynomial Schwarzian derivative
25 pages
null
null
null
math.DS
null
The ergodic theory and geometry of the Julia set of meromorphic functions on the complex plane with polynomial Schwarzian derivative is investigated under the condition that the forward trajectory of asymptotic values in the Julia set is bounded and the map $f$ restricted to its closure is expanding, the property refered to as sub-expanding. We first show the existence, uniqueness, conservativity and ergodicity of a conformal measure $m$ with minimal exponent $h$; furthermore, we show weak metrical exactness of this measure. Then we prove the existence of a $\sg$--finite invariant measure $\mu$ absolutely continuous with respect to $m$. Our main result states that $\mu$ is finite if and only if the order $\rho$ of the function $f$ satisfies the condition $h>3\frac{\rho}{\rho +1}$. When finite, this measure is shown to be metrically exact. We also establish a version of Bowen's formula showing that the exponent $h$ equals the Hausdorff dimension of the Julia set of $f$.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 07:36:10 GMT" } ]
2007-11-15T00:00:00
[ [ "Mayer", "Volker", "" ], [ "Urbański", "Mariusz", "" ] ]
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711.2124
Kohei Hamaya
K. Hamaya, M. Kitabatake, K. Shibata, M. Jung, M. Kawamura, K. Hirakawa, T. Machida, T. Taniyama, S. Ishida, and Y. Arakawa
Kondo effect in a semiconductor quantum dot coupled to ferromagnetic electrodes
4 pages, 3 figures
null
10.1063/1.2820445
null
cond-mat.mes-hall cond-mat.mtrl-sci
null
Using a laterally-fabricated quantum-dot (QD) spin-valve device, we experimentally study the Kondo effect in the electron transport through a semiconductor QD with an odd number of electrons (N). In a parallel magnetic configuration of the ferromagnetic electrodes, the Kondo resonance at N = 3 splits clearly without external magnetic fields. With applying magnetic fields (B), the splitting is gradually reduced, and then the Kondo effect is almost restored at B = 1.2 T. This means that, in the Kondo regime, an inverse effective magnetic field of B ~ 1.2 T can be applied to the QD in the parallel magnetic configuration of the ferromagnetic electrodes.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 08:07:02 GMT" }, { "version": "v2", "created": "Sun, 16 Dec 2007 02:48:01 GMT" } ]
2009-11-13T00:00:00
[ [ "Hamaya", "K.", "" ], [ "Kitabatake", "M.", "" ], [ "Shibata", "K.", "" ], [ "Jung", "M.", "" ], [ "Kawamura", "M.", "" ], [ "Hirakawa", "K.", "" ], [ "Machida", "T.", "" ], [ "Taniyama", "T.", "" ], [ "Ishida", "S.", "" ], [ "Arakawa", "Y.", "" ] ]
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711.2125
Jose Antonio Oller
J.A. Oller, L. Roca, C. Schat
Scalar radius of the pion and two photons into two pions. Strong S-wave final state interactions
10 pages, 1 figure. Invited talk at the 11th International Conference on Meson-Nucleon Physics and the Structure of the Nucleon (MENU 2007), September 10-14, 2007, IKP, Forschungzentrum J\"ulich, Germany
ECONFC070910:156,2007
null
null
hep-ph
null
The quadratic pion scalar radius, <r^2>^\pi_s, plays an important role for present precise determinations of \pi\pi scattering. The solution of the Muskhelishvili-Omn\`es equations for the non-strange null isospin (I) pion scalar form factor determines that <r^2>^\pi_s=(0.61\pm 0.04) fm^2. However, by using an Omn\`es representation of this form factor, Yndur\'ain recently obtains <r^2>^\pi_s=(0.75\pm 0.07) fm^2. A large discrepancy between both values, given the precision, then results. We show that Yndur\'ain's method is indeed compatible with the determinations from the Muskhelishvili-Omn\`es equations once a zero in the scalar form factor for some S-wave I=0 T-matrices is considered. Once this is accounted for, the resulting value is <r^2>^\pi=(0.63\pm 0.05) fm^2. On the other hand, we perform a theoretical study of the reaction \gamma\gamma\to \pi^0\pi^0 based on dispersion relations. The large source of uncertainty for \sqrt{s}\gtrsim 0.5 GeV, due to variations in the phase used in the Omn\`es function above the K\bar{K} threshold, is removed by taking one more subtraction in the dispersion relation. This allows us to make sharper predictions for the cross section so that one could use this reaction to distinguish between different low energy \pi\pi parameterizations, once independent experiments are available. We also study the role played by the \sigma or f_0(600) meson in this reaction and determine its width to two photons.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 07:59:51 GMT" } ]
2008-11-26T00:00:00
[ [ "Oller", "J. A.", "" ], [ "Roca", "L.", "" ], [ "Schat", "C.", "" ] ]
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711.2126
Ray-Kuang Lee
Tsin-Dong Lee, Chih-Yao Chen, YuanYao Lin, Chia-Yu Chang, Ming-Chiu Chou, Hung-Pin D. Yang, Te-ho Wu, and Ray-Kuang Lee
Direct observation of higher-order whispering-gallery modes in VCSELs at room temperature by embedding a defect-free surface micro-structure
null
null
null
null
physics.optics
null
We propose and demonstrate a direct method to observe higher-order whispering-gallery modes in vertical cavity surface emitting lasers (VCSELs) at room temperature. Instead of introducing any defect mode, we show that suppression of lower-order cavity modes can be achieved by destroying vertical reflectors with a surface micro-structure. Up to the 23rd azimuthal order whispering-gallery mode confined laterally by the native oxide layers is observed in experiments through collecting near-field radiation patterns. Various vertical emission transverse modes are identified by the spectrum in experiments as well as numerical simulations.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 08:25:56 GMT" } ]
2007-11-15T00:00:00
[ [ "Lee", "Tsin-Dong", "" ], [ "Chen", "Chih-Yao", "" ], [ "Lin", "YuanYao", "" ], [ "Chang", "Chia-Yu", "" ], [ "Chou", "Ming-Chiu", "" ], [ "Yang", "Hung-Pin D.", "" ], [ "Wu", "Te-ho", "" ], [ "Lee", "Ray-Kuang", "" ] ]
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711.2127
Pascu Catalin Moca
C. P. Moca and D. C. Marinescu
Spin-Hall conductivity of a spin-polarized two-dimensional electron gas with Rashba spin-orbit interaction and magnetic impurities
13 pages, 5 figures
New Journal of Physics 9, 343 (2007)
10.1088/1367-2630/9/9/343
null
cond-mat.mtrl-sci cond-mat.mes-hall
null
The Kubo formula is used to calculate the spin-Hall conductivity in a spin-polarized two-dimensional electron system with Rashba-type spin-orbit interaction. As in the case of the unpolarized electron system, spin Hall conductivity is entirely determined by states at the Fermi level, a property that persists in the presence of magnetic impurities. In the clean limit, the spin-Hall conductivity decreases monotonically with the Zeeman splitting, a result of the ordering effect on the electron spins produced by the magnetic field. In the presence of magnetic impurities, the spin-dependent scattering determines a finite renormalization of the static part of the fully dressed vertex correction of the velocity operator that leads to an enhancement of the \sigma_{sH}, an opposite behaviour to that registered in the presence of spin-independent disorder. The variation of \sigma_{sH} with the strength of the Rashba coupling and the Zeeman splitting is studied.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 08:33:00 GMT" }, { "version": "v2", "created": "Thu, 15 Nov 2007 10:02:44 GMT" } ]
2009-11-13T00:00:00
[ [ "Moca", "C. P.", "" ], [ "Marinescu", "D. C.", "" ] ]
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711.2128
Alexander Premet
Alexander Premet
Support varieties of non-restricted modules over Lie algebras of reductive groups: corrigenda and addenda
6 pages
null
null
null
math.RT math.RA
null
This paper fixes a gap in my article "Support varieties of non-restricted modules over Lie algebras of reductive groups" pointed out to me by J.C. Jantzen. It was written several years ago, but never widely circulated.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 08:39:01 GMT" } ]
2007-11-15T00:00:00
[ [ "Premet", "Alexander", "" ] ]
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711.2129
Frank Pollmann
P. Fulde, F. Pollmann
Strings in strongly correlated electron systems
6
AnnalenPhys.17:441-449,1997
10.1002/andp.200810309
null
cond-mat.str-el
null
It is shown that strongly correlated electrons on frustrated lattices like pyrochlore, checkerboard or kagome lattice can lead to the appearance of closed and open strings. They are resulting from nonlocal subsidiary conditions which propagating strongly correlated electrons require. The dynamics of the strings is discussed and a number of their properties are pointed out. Some of them are reminiscent of particle physics.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 08:40:41 GMT" } ]
2008-11-26T00:00:00
[ [ "Fulde", "P.", "" ], [ "Pollmann", "F.", "" ] ]
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711.213
Artem Sabourov
S.P. Knurenko, A.V. Sabourov, and I.Ye. Sleptsov
Behavior of some characteristics of EAS in the region of knee and ankle of spectrum
6 pages, 9 figures
null
null
null
astro-ph
null
The energy dependence of such characteristics as a ratio of the total number of charged particles to the total flux of EAS Cherenkov radiation, a ratio of E(thr)>=1GeV muon flux density at the distance of 600m from a shower core to charged particle flux density, a ratio of the energy transferred to the electromagnetic component of EAS to the primary particle energy is presented. Their comparison with two-component mass composition of cosmic rays (p-Fe) in the framework of calculations by a QGSJET model is given.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 08:45:18 GMT" } ]
2007-11-15T00:00:00
[ [ "Knurenko", "S. P.", "" ], [ "Sabourov", "A. V.", "" ], [ "Sleptsov", "I. Ye.", "" ] ]
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711.2131
Ting-Wai Chiu
TWQCD Collaboration: Ting-Wai Chiu, Tung-Han Hsieh, Chao-Hsi Huang, Kenji Ogawa
Dirac b quark on the lattice
7 pages, 1 figure, Proceedings of Lattice 2007, Regensburg, Germany, July 30 - August 4, 2007
PoS LAT2007:105,2007
null
NTUTH-07-505F
hep-lat hep-ex hep-ph
null
We perform the first study of treating b, c, and s quarks as Dirac fermions in lattice QCD with exact chiral symmetry. On a 32^3 60 lattice with 1/a ~ 7.68 GeV, we compute point-to-point quark propagators, and measure the time-correlation functions for mesons with quark contents b_bbar, c_bbar, s_bbar, and c_cbar. The lowest-lying meson mass spectra, the pseudoscalar decay constants, and the b and c quark masses are determined.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 09:42:48 GMT" } ]
2011-02-16T00:00:00
[ [ "TWQCD Collaboration", "", "" ], [ "Chiu", "Ting-Wai", "" ], [ "Hsieh", "Tung-Han", "" ], [ "Huang", "Chao-Hsi", "" ], [ "Ogawa", "Kenji", "" ] ]
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711.2132
Hiroshi Suzuki
Issaku Kanamori, Fumihiko Sugino and Hiroshi Suzuki
Observing dynamical supersymmetry breaking with euclidean lattice simulations
35 pages, 9 figures, the final version to appear in Prog. Theor. Phys
Prog.Theor.Phys.119:797-827,2008
10.1143/PTP.119.797
RIKEN-TH-122, OIQP-07-16
hep-lat hep-th
null
A strict positivity of the ground-state energy is a necessary and sufficient condition for spontaneous supersymmetry breaking. This ground-state energy may be directly determined from the expectation value of the Hamiltonian in the functional integral, defined with an \emph{antiperiodic} temporal boundary condition for all fermionic variables. We propose to use this fact to observe the dynamical spontaneous supersymmetry breaking in Euclidean lattice simulations. If a lattice formulation possesses a manifestly preserved fermionic symmetry, there exists a natural choice of a Hamiltonian operator that is consistent with a topological nature of the Witten index. We numerically confirm the validity of our idea in models of supersymmetric quantum mechanics. We further examine the possibility of dynamical supersymmetry breaking in the two-dimensional $\mathcal{N}=(2,2)$ super Yang-Mills theory with the gauge group SU(2), for which the Witten index is unknown. Although statistical errors are still large, we do not observe positive ground-state energy, at least within one standard deviation. This prompts us to draw a different conclusion from a recent conjectural claim that supersymmetry is dynamically broken in this system.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 08:57:11 GMT" }, { "version": "v2", "created": "Tue, 4 Dec 2007 00:55:33 GMT" }, { "version": "v3", "created": "Fri, 23 May 2008 00:32:25 GMT" } ]
2008-11-26T00:00:00
[ [ "Kanamori", "Issaku", "" ], [ "Sugino", "Fumihiko", "" ], [ "Suzuki", "Hiroshi", "" ] ]
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711.2133
A. K. Chaudhuri
A. K. Chaudhuri
$J/\psi$ suppression in the threshold model at RHIC and LHC energy
9 pages, 9 figures
J.Phys.G35:065105,2008
10.1088/0954-3899/35/6/065105
null
nucl-th
null
In the QGP based threshold model \cite{Blaizot:2000ev,Blaizot:1996nq}, in addition to the normal nuclear absorption, $J/\psi$'s are subjected to an 'anomalous' suppression such that above a threshold density $n_{J/\psi}$, all the $J/\psi$'s are melted. In the threshold model we have analysed the recent PHENIX data on the centrality dependence of $J/\psi$ suppression in Au+Au collisions at RHIC. Feedback from decay of the state $\chi$ is accounted for. $J/\psi$'s are anomalously suppressed above a threshold density, $n_{J/\psi}=3.57\pm 0.17$ $fm^{-2}$. Threshold density for anomalous suppression of the state $\chi$ is uncertain to a large extent, $n_\chi=0.32 \pm 0.32$ $fm^{-2}$. The fraction $F$ of the state $\chi$ can not be determined unambiguously, depending on the nuclear absorption, it can vary from 20% to 40%. We have also predicted for the suppression in Pb+Pb collisions at LHC energy. In central Pb+Pb collisions, $J/\psi$'s are suppressed by a factor of 3-4. Suppression pattern is rather similar to that in Au+Au collisions, if not slighty less in central collisions. Using the PHENIX data on the participant number dependence of the Bjorken energy density, we have also estimated the QGP formation time. For critical temperature $T_c$=192 MeV, estimated QGP formation time ranges between 0.07-0.09 fm/c.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 09:00:55 GMT" } ]
2008-11-26T00:00:00
[ [ "Chaudhuri", "A. K.", "" ] ]
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711.2134
Tetsu Mizumachi
Tetsu Mizumachi
Asymptotic stability of lattice solitons in the energy space
19pages
null
null
null
math.AP math-ph math.MP
null
Orbital and asymptotic stability for 1-soliton solutions to the Toda lattice equations as well as small solitary waves to the FPU lattice equations are established in the energy space. Unlike analogous Hamiltonian PDEs, the lattice equations do not conserve momentum. Furthermore, the Toda lattice equation is a bidirectional model that does not fit in with existing theory for Hamiltonian system by Grillakis, Shatah and Strauss. To prove stability of 1-soliton solutions, we split a solution around a 1-soliton into a small solution that moves more slowly than the main solitary wave, and an exponentially localized part. We apply a decay estimate for solutions to a linearized Toda equation which has been recently proved by Mizumachi and Pego to estimate the localized part. We improve the asymptotic stability results for FPU lattices in a weighted space obtained by Friesecke and Pego.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 09:01:57 GMT" } ]
2007-11-15T00:00:00
[ [ "Mizumachi", "Tetsu", "" ] ]
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711.2135
Masanori Hino
Masanori Hino
Martingale dimensions for fractals
22 pages, 1 figure
Annals of Probability, Vol. 36, No. 3 (2008), 971-991
10.1214/07-AOP349
null
math.PR
null
We prove that the martingale dimensions for canonical diffusion processes on a class of self-similar sets including nested fractals are always one. This provides an affirmative answer to the conjecture of S. Kusuoka [Publ. Res. Inst. Math. Sci. 25 (1989) 659--680].
[ { "version": "v1", "created": "Wed, 14 Nov 2007 09:18:29 GMT" } ]
2008-04-22T00:00:00
[ [ "Hino", "Masanori", "" ] ]
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711.2136
Jeremy Shears
Jeremy Shears, Steve Brady, Jerry Foote, Donn Starkey, Tonny Vanmunster
The orbital and superhump periods of the deeply eclipsing dwarf nova SDSS J122740.83+513925.9
Accepted for publication in the Journal of the British Astronomical Association. 12 pages, 9 figures
null
null
null
astro-ph
null
During June 2007 the first confirmed superoutburst of the eclipsing dwarf nova SDSS J122740.83+513925.9 was observed using CCD photometry. The outburst amplitude was at least 4.7 magnitudes. The orbital period was measured as 0.06296(5) d from times of the 31 observed eclipses. Time series photometry also revealed superhumps with a period of 0.0653(3) d, thereby establishing it to be a UGSU-type system. The superhump period excess was 3.7% and the maximum peak-to-peak amplitude of the superhumps was 0.35 magnitudes. The eclipse duration declined from a maximum of 23 min at the peak of the outburst to about 12 mins towards the end. The depth of the eclipses was correlated with the beat period between the orbital and superhump periods.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 09:24:40 GMT" } ]
2007-11-15T00:00:00
[ [ "Shears", "Jeremy", "" ], [ "Brady", "Steve", "" ], [ "Foote", "Jerry", "" ], [ "Starkey", "Donn", "" ], [ "Vanmunster", "Tonny", "" ] ]
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711.2137
Gerasimos Dousmanis
Gerasimos Dousmanis
Rank two filtered $(\phi, N)$-modules with Galois descent data and coefficients
Final version. To appear in Trans. A.M.S
null
null
null
math.NT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Let $K$ be any finite extension of $Q_{p}$, $L$ any finite Galois extension of $K$ and $E$ any finite large enough coefficient field containing $L$. We classify two-dimensional, F-semistable $E$-representations of $G_{K}$, by listing the isomorphism classes of rank two weakly admissible filtered $(\phi,N,L/K,E)$-modules.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 09:28:55 GMT" }, { "version": "v2", "created": "Mon, 20 Oct 2008 15:36:38 GMT" }, { "version": "v3", "created": "Tue, 19 May 2009 07:12:52 GMT" } ]
2009-05-19T00:00:00
[ [ "Dousmanis", "Gerasimos", "" ] ]
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711.2138
Michael Ruzhansky
Michael Ruzhansky and James Smith
Dispersive and Strichartz estimates for hyperbolic equations with constant coefficients
119 pages
MSJ Memoirs, 22, Mathematical Society of Japan, Tokyo, 2010.
null
null
math.AP math.FA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Dispersive and Strichartz estimates for solutions to general strictly hyperbolic partial differential equations with constant coefficients are considered. The global time decay estimates of $L^p-L^q$ norms of propagators are obtained, and it is shown how the time decay rates depend on the geometry of the problem. The frequency space is separated in several zones each giving a certain decay rate. Geometric conditions on characteristics responsible for the particular decay are identified and investigated. Thus, a comprehensive analysis is carried out for strictly hyperbolic equations of high orders with lower order terms of a general form. Results are applied to establish time decay estimates for the Fokker-Planck equation and for semilinear hyperbolic equations.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 09:31:41 GMT" }, { "version": "v2", "created": "Wed, 30 Dec 2009 20:29:51 GMT" } ]
2010-04-27T00:00:00
[ [ "Ruzhansky", "Michael", "" ], [ "Smith", "James", "" ] ]
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711.2139
Damien Dornic
J. Carr, D. Dornic, F. Jouvenot, G. Maurin (for the KM3NeT consortium)
Configuration studies for a cubic-kilometre deep-sea neutrino telescope - KM3NeT - with NESSY, a fast and flexible approach
4 pages, 5 figures, contribution for the 30th International Cosmic Ray conference
null
null
null
astro-ph
null
Theoretical predictions for neutrino fluxes indicate that km$^{3}$ scale detectors are needed to detect certain astrophysical sources. The three Mediterranean experiments, ANTARES, NEMO and NESTOR are working together on a design study, KM3NeT, for a large deep-sea neutrino telescope. A detector placed in the Mediterranean Sea will survey a large part of the Galactic disc, including the Galactic Centre. It will complement the IceCube telescope currently under construction at the South Pole. Furthermore, the improved optical properties of sea water, compared to Antarctic ice, will allow a better angular resolution and hence better background rejection. The main work presented in this paper is to evaluate different km$^{3}$ scale detector geometries in order to optimize the muon neutrino sensitivity between 1 and 100 TeV. For this purpose, we have developed a detailed simulation based on the {\it Mathematica} software - for the muon track production, the light transmission in water, the environmental background and the detector response. To compare different geometries, we have mainly used the effective neutrino area obtained after the full standard reconstruction chain.}
[ { "version": "v1", "created": "Wed, 14 Nov 2007 09:41:30 GMT" } ]
2019-08-14T00:00:00
[ [ "Carr", "J.", "", "for the KM3NeT consortium" ], [ "Dornic", "D.", "", "for the KM3NeT consortium" ], [ "Jouvenot", "F.", "", "for the KM3NeT consortium" ], [ "Maurin", "G.", "", "for the KM3NeT consortium" ] ]
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711.214
Erik Sjoqvist
David Kult, Johan {\AA}berg, Erik Sj\"oqvist
Holonomy for Quantum Channels
Minor changes, journal reference added
Phys. Rev. A 77, 012114 (2008)
10.1103/PhysRevA.77.012114
null
quant-ph
null
A quantum holonomy reflects the curvature of some underlying structure of quantum mechanical systems, such as that associated with quantum states. Here, we extend the notion of holonomy to families of quantum channels, i.e., trace preserving completely positive maps. By the use of the Jamio{\l}kowski isomorphism, we show that the proposed channel holonomy is related to the Uhlmann holonomy. The general theory is illustrated for specific examples. We put forward a physical realization of the channel holonomy in terms of interferometry. This enables us to identify a gauge invariant physical object that directly relates to the channel holonomy. Parallel transport condition and concomitant gauge structure are delineated in the case of smoothly parametrized families of channels. Finally, we point out that interferometer tests that have been carried out in the past to confirm the $4\pi$ rotation symmetry of the neutron spin, can be viewed as early experimental realizations of the channel holonomy.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 09:53:54 GMT" }, { "version": "v2", "created": "Wed, 30 Jan 2008 08:18:44 GMT" } ]
2016-03-28T00:00:00
[ [ "Kult", "David", "" ], [ "Åberg", "Johan", "" ], [ "Sjöqvist", "Erik", "" ] ]
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711.2141
Nicola Manini
L. Salasnich, N. Manini and F. Toigo
Macroscopic Periodic Tunneling of Fermi Atoms in the BCS-BEC Crossover
6 pages 3 figures revtex
Phys. Rev. A 77, 043609 (2008)
10.1103/PhysRevA.77.043609
null
cond-mat.stat-mech cond-mat.soft cond-mat.supr-con
null
We study the macroscopic quantum tunneling of two weakly-linked superfluids made of interacting fermionic atoms. We derive atomic Josephson junction equations and find that zero-mode and pi-mode frequencies of coherent atomic oscillations depend on the tunneling coefficient and the sound velocity of the superfluid. By considering a superfluid of ^40K atoms, we calculate these oscillation frequencies in the crossover from the Bardeen-Cooper-Schrieffer state of weakly-bound Cooper pairs to the Bose-Einstein Condensate of strongly-bound molecular dimers.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 09:59:14 GMT" }, { "version": "v2", "created": "Mon, 3 Dec 2007 16:13:25 GMT" }, { "version": "v3", "created": "Mon, 17 Mar 2008 10:52:12 GMT" } ]
2008-04-09T00:00:00
[ [ "Salasnich", "L.", "" ], [ "Manini", "N.", "" ], [ "Toigo", "F.", "" ] ]
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711.2142
Jean-Philippe Beaulieu
J.P. Beaulieu, S. Carey, I. Ribas, G. Tinetti
Primary transit of the planet HD189733b at 3.6 and 5.8 microns
6 pages, 4 figures, Astrophysical Journal 675. Accepted Nov 21, 20007, to appear on March 10, 2008
Astrophys.J.677:1343-1347,2008
10.1086/527045
null
astro-ph
null
The hot Jupiter HD 189733b was observed during its primary transit using the Infrared Array Camera on the Spitzer Space Telescope. The transit depths were measured simultaneously at 3.6 and 5.8 microns. Our analysis yields values of 2.356 +- 0.019 % and 2.436 +- 0.020$ % at 3.6 and 5.8 microns respectively, for a uniform source. We estimated the contribution of the limb-darkening and star-spot effects on the final results. We concluded that although the limb darkening increases by ~0.02-0.03 % the transit depths, and the differential effects between the two IRAC bands is even smaller, 0.01 %. Furthermore, the host star is known to be an active spotted K star with observed photometric modulation. If we adopt an extreme model of 20 % coverage with spots 1000K cooler of the star surface, it will make the observed transits shallower by 0.19 and 0.18 %. The difference between the two bands will be only of 0.01 %, in the opposite direction to the limb darkening correction. If the transit depth is affected by limb darkening and spots, the differential effects between the 3.6 and 5.8 microns bands are very small. The differential transit depths at 3.6 and 5.8 microns and the recent one published by Knutson et al.(2007) at 8 microns are in agreement with the presence of water vapour in the upper atmosphere of the planet. This is the companion paper to Tinetti et al. (2007b), where the detailed atmosphere models are presented.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 10:02:48 GMT" }, { "version": "v2", "created": "Fri, 15 Feb 2008 11:47:30 GMT" } ]
2010-03-01T00:00:00
[ [ "Beaulieu", "J. P.", "" ], [ "Carey", "S.", "" ], [ "Ribas", "I.", "" ], [ "Tinetti", "G.", "" ] ]
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711.2143
Timothy Johnson
Andrew J. F. Jack, Timothy C. Johnson, Mihail Zervos
A Singular Control Model with Application to the Goodwill Problem
null
null
null
null
math.PR math.OC
null
We consider a stochastic system whose uncontrolled state dynamics are modelled by a general one-dimensional It\^{o} diffusion. The control effort that can be applied to this system takes the form that is associated with the so-called monotone follower problem of singular stochastic control. The control problem that we address aims at maximising a performance criterion that rewards high values of the utility derived from the system's controlled state but penalises any expenditure of control effort. This problem has been motivated by applications such as the so-called goodwill problem in which the system's state is used to represent the image that a product has in a market, while control expenditure is associated with raising the product's image, e.g., through advertising. We obtain the solution to the optimisation problem that we consider in a closed analytic form under rather general assumptions. Also, our analysis establishes a number of results that are concerned with analytic as well as probabilistic expressions for the first derivative of the solution to a second order linear non-homogeneous ordinary differential equation. These results have independent interest and can potentially be of use to the solution of other one-dimensional stochastic control problems.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 20:46:06 GMT" } ]
2007-11-15T00:00:00
[ [ "Jack", "Andrew J. F.", "" ], [ "Johnson", "Timothy C.", "" ], [ "Zervos", "Mihail", "" ] ]
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711.2144
Masanori Hino
Masanori Hino and Hiroto Uchida
Reflecting Ornstein-Uhlenbeck processes on pinned path spaces
19 pages
Proceedings of RIMS Workshop on Stochastic Analysis and Applications, 111-128, RIMS Kokyuroku Bessatsu, B6, Res. Inst. Math. Sci. (RIMS), Kyoto, 2008
null
null
math.PR
null
Consider a set of continuous maps from the interval $[0,1]$ to a domain in ${\mathbb R}^d$. Although the topological boundary of this set in the path space is not smooth in general, by using the theory of functions of bounded variation (BV functions) on the Wiener space and the theory of Dirichlet forms, we can discuss the existence of the surface measure and the Skorokhod representation of the reflecting Ornstein-Uhlenbeck process associated with the canonical Dirichlet form on this set.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 10:08:20 GMT" } ]
2008-04-22T00:00:00
[ [ "Hino", "Masanori", "" ], [ "Uchida", "Hiroto", "" ] ]
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711.2145
Damien Dornic
J. Carr, D. Dornic, F. Jouvenot, U.F. Katz, S. Kuch, G. Maurin, R. Shanidze (for the KM3NeT consortium)
Sensitivity studies for the cubic-kilometre deep-sea neutrino telescope KM3NeT
4 pages, 1 figure, contribution of the 30th International Cosmic Ray conference
null
null
null
astro-ph
null
The observation of high-energy neutrinos from astrophysical sources would substantially improve our knowledge and understanding of the non-thermal processes in these sources, and would in particular pinpoint the accelerators of cosmic rays. The sensitivity of different design options for a future cubic-kilometre scale neutrino telescope in the Mediterranean Sea is investigated for generic point sources and in particular for some of the galactic objects from which TeV gamma emmission has recently been observed by the H.E.S.S. atmospheric Cherenkov telescope. The effect of atmospheric background on the source detection probabilities has been taken into account through full simulation. The estimated event rates are compared to previous results and limits from present neutrino telescopes.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 10:09:00 GMT" } ]
2019-08-14T00:00:00
[ [ "Carr", "J.", "", "for the KM3NeT consortium" ], [ "Dornic", "D.", "", "for the KM3NeT consortium" ], [ "Jouvenot", "F.", "", "for the KM3NeT consortium" ], [ "Katz", "U. F.", "", "for the KM3NeT consortium" ], [ "Kuch", "S.", "", "for the KM3NeT consortium" ], [ "Maurin", "G.", "", "for the KM3NeT consortium" ], [ "Shanidze", "R.", "", "for the KM3NeT consortium" ] ]
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711.2146
Fethi Mahmoudi
Mouhamed Moustapha Fall and Fethi Mahmoudi
Hypersurfaces with free boundary and large constant mean curvature: concentration along submanifolds
28 pages
null
null
null
math.AP math.DG
null
Given a domain $\Omega$ of $\mathbb{R}^{m+1}$ and a $k$-dimensional non-degenerate minimal submanifold $K$ of $\pa \Omega$ with $1\le k\le m-1$, we prove the existence of a family of embedded constant mean curvature hypersurfaces which as their mean curvature tends to infinity concentrate along $K$ and intersecting $\partial \Omega$ perpendicularly.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 10:13:38 GMT" } ]
2007-11-15T00:00:00
[ [ "Fall", "Mouhamed Moustapha", "" ], [ "Mahmoudi", "Fethi", "" ] ]
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711.2147
Gilles Maurin
G. Maurin, A. Djannati-Atai, P. Espigat
A Deconvolution technique for VHE Gamma-ray Astronomy, and its application to the morphological study of shell-type supernova remnants
4 pages, 3 figures, contribution for the 30th International Cosmic Ray Conference
null
null
null
astro-ph
null
Deconvolution algorithms have been used successfully for optimization/restoration/deblurring of astronomical images in a variety of wavelengths, especially in the optical band (e.g., for HST). We present here an iterative Richardson-Lucy type method designed for treatment of images obtained with the H.E.S.S. array of ground-based gamma-ray telescopes. Its application to shell-type supernova remnant images yields refined details relevant for the study of correlations with other wavelengths, and hence for interpretation in terms either of hadronic or leptonic origin of the observed VHE gamma-ray emission.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 10:21:54 GMT" } ]
2007-11-15T00:00:00
[ [ "Maurin", "G.", "" ], [ "Djannati-Atai", "A.", "" ], [ "Espigat", "P.", "" ] ]
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711.2148
J\"urgen Blum
Doreen Langkowski, Jens Teiser, J\"urgen Blum
The Physics of Protoplanetesimal Dust Agglomerates II. Low Velocity Collision Properties
46 pages, 1 table, 16 figures
null
10.1086/525841
null
astro-ph
null
For the investigation of collisions among protoplanetesimal dust aggregates, we performed microgravity experiments in which the impacts of high-porosity mm-sized dust aggregates into 2.5 cm-sized high-porosity dust aggregates can be studied. The dust aggregates consisted of micrometer-sized dust grains and were produced by random ballistic deposition with porosities between 85% and 93%. Impact velocities ranged from ~0.1 m/s to ~3 m/s and impact angles were almost randomly distributed. We also used "molded" target aggregates such that the radii of the local surface curvatures corresponded to the projectile radii. The experiments showed that impacts into the highest-porosity targets almost always led to sticking, whereas for the less porous dust aggregates, the collisions with intermediate velocities and high impact angles resulted in the bouncing of the projectile with a mass transfer from the target to the projectile aggregate. Sticking probabilities for the impacts into the "molded" target aggregates were considerably decreased. For the impacts into smooth targets, we measured the depth of intrusion and the crater volume and could derive some interesting dynamical properties which can help to derive a collision model for protoplanetesimal dust aggregates. Future models of the aggregate growth in protoplanetary disks should take into account non-central impacts, impact compression, the influence of the local radius of curvature on the collisional outcome and the possible mass transfer between target and projectile agglomerates in non-sticking collisions.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 13:48:30 GMT" } ]
2009-11-13T00:00:00
[ [ "Langkowski", "Doreen", "" ], [ "Teiser", "Jens", "" ], [ "Blum", "Jürgen", "" ] ]
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711.2149
Jan Pomplun
Jan Pomplun, Sven Burger, Lin Zschiedrich, Frank Schmidt
Adaptive Finite Element Method for Simulation of Optical Nano Structures
null
phys. stat. sol. (b), 244, No. 10, 3419-3434 (2007)
10.1002/pssb.200743192
null
physics.optics
null
We discuss realization, properties and performance of the adaptive finite element approach to the design of nano-photonic components. Central issues are the construction of vectorial finite elements and the embedding of bounded components into the unbounded and possibly heterogeneous exterior. We apply the finite element method to the optimization of the design of a hollow core photonic crystal fiber. Thereby we look at the convergence of the method and discuss automatic and adaptive grid refinement and the performance of higher order elements.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 10:39:56 GMT" } ]
2015-05-13T00:00:00
[ [ "Pomplun", "Jan", "" ], [ "Burger", "Sven", "" ], [ "Zschiedrich", "Lin", "" ], [ "Schmidt", "Frank", "" ] ]
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711.215
Jean-Christophe Aval
Jean-Christophe Aval (LaBRI)
Keys and alternating sign matrices
null
Seminaire Lotharingien de Combinatoire 59 (2008) B59f
null
null
math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Lascoux and Sch\"utzenberger introduced a notion of key associated to any Young tableau. More recently Lascoux defined the key of an alternating sign matrix by recursively removing all -1's in such matrices. But alternating sign matrices are in bijection with monotone triangles, which form a subclass of Young tableaux. We show that in this case these two notions of keys coincide. Moreover we obtain an elegant and direct way to compute the key of any Young tableau, and discuss consequences of our result.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 10:29:09 GMT" }, { "version": "v2", "created": "Mon, 18 May 2009 08:21:18 GMT" } ]
2009-05-18T00:00:00
[ [ "Aval", "Jean-Christophe", "", "LaBRI" ] ]
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711.2151
Sinya Aoki
Sinya Aoki
Hadron interactions from lattice QCD
15 pages, 10 figures, Plenary talk presented at the XXVth International Symposium on Lattice Field Theory, July 30 - August 4, 2007, Regensburg, Germany
PoSLAT2007:002,2007
null
null
hep-lat nucl-th
null
Studies on hadron interactions from lattice QCD are reviewed. The $S$-wave $\pi\pi$ scattering lengths of the I=0 and I=2 channels are extracted from various lattice determinations of low energy constants in $N_f=2$ chiral perturbation theory. The results agree with each other and agree also with other non-lattice estimates. Recently the $P$-wave $\pi\pi$ scattering phase shift for the I=1 channel has been calculated. A preliminary estimate of the $\rho$ meson decay width from the phase shift is consistent with the experimental value. Two approaches to potentials between hadrons are discussed. One is a method using static quarks to define the distance between two hadrons. The other is a method to define a potential from a wave function of two hadrons. An application of the latter to the nucleon-nucleon ($NN$) potential turns out to reproduce qualitative features of the phenomenological $NN$ potential such as attraction at long distance and repulsion at short distance. Theoretical issues of this approach are also discussed.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 10:34:13 GMT" } ]
2009-04-14T00:00:00
[ [ "Aoki", "Sinya", "" ] ]
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711.2152
Paul David Mitchener
Paul D. Mitchener
$KK$-theory spectra for $C^\ast$-categories and discrete groupoid $C^\ast$-algebras
null
null
null
null
math.KT math.OA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper we refine a version of bivariant $K$-theory developed by Cuntz to define symmetric spectra representing the $KK$-theory of $C^\ast$-categories and discrete groupoid $C^\ast$-algebras. In both cases, the Kasparov product can be expressed as a smash product of spectra.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 10:39:43 GMT" }, { "version": "v2", "created": "Fri, 6 Jun 2008 12:30:22 GMT" } ]
2008-06-06T00:00:00
[ [ "Mitchener", "Paul D.", "" ] ]
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711.2153
Ayesha Begum Dr
Jayaram N. Chengalur, Ayesha Begum, I. D. Karachentsev, Margarita Sharina, S. S. Kaisin
Gas rich galaxies from the FIGGS survey
5 Pages, 4 Figures. To be published in the proceedings of "Galaxies in the Local Volume", ed. B. Koribalski, H. Jerjen
null
10.1007/978-1-4020-6933-8_13
null
astro-ph
null
The FIGGS (Faint Irregular Galaxy GMRT Survey) is aimed at creating a multi-wavelength observational data base for a volume limited sample of the faintest gas rich galaxies. In this paper we discuss two very gas rich galaxies that were observed as part of the FIGGS survey, viz. NGC 3741 and And IV. These galaxies are unusual in that they have extremely extended gas disks and very high ratios of dark to luminous matter. The very extended HI disks provide an unique opportunity to trace the extended distribution of dark matter around faint galaxies. We compare the baryon fraction of these galaxies with a sample of galaxies with well measured rotation curves and discuss whether extremely gas rich dwarf galaxies have abnormally small baryon fractions.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 10:44:38 GMT" } ]
2015-05-13T00:00:00
[ [ "Chengalur", "Jayaram N.", "" ], [ "Begum", "Ayesha", "" ], [ "Karachentsev", "I. D.", "" ], [ "Sharina", "Margarita", "" ], [ "Kaisin", "S. S.", "" ] ]
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711.2154
Rainer Rolffs
Rainer Rolffs, Peter Schilke, Claudia Comito, Carolin Hieret, Friedrich Wyrowski
Hot Cores in the submm - obscured by dust?
4 pages, 3 figures, to appear in "Science with ALMA: a new era for Astrophysics" Conference Proceedings (to be published by Springer "Astrophysics and Space Science (ApSS)")
null
null
null
astro-ph
null
We present APEX observations of HCN (9-8) and (4-3) lines toward a sample of hot cores. The spectral shapes of the main transitions are asymmetric and self-absorbed, as expected for high optical depth in a possibly infalling envelope. For spherical symmetry, the large column densities of these sources would mean that the central region is obscured by dust above a certain frequency. However, we detected the vibrationally excited satellite lines (v_2=1; J=9-8) at 797 GHz, which originate from the inner regions. This indicates that high-frequency ALMA observations of hot core centers will be feasible.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 11:54:02 GMT" } ]
2007-11-15T00:00:00
[ [ "Rolffs", "Rainer", "" ], [ "Schilke", "Peter", "" ], [ "Comito", "Claudia", "" ], [ "Hieret", "Carolin", "" ], [ "Wyrowski", "Friedrich", "" ] ]
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711.2155
Stijn Heymans
Stijn Heymans, Jos de Bruijn, Livia Predoiu, Cristina Feier, Davy Van Nieuwenborgh
Guarded Hybrid Knowledge Bases
18 pages
null
null
null
cs.LO
null
Recently, there has been a lot of interest in the integration of Description Logics and rules on the Semantic Web.We define guarded hybrid knowledge bases (or g-hybrid knowledge bases) as knowledge bases that consist of a Description Logic knowledge base and a guarded logic program, similar to the DL+log knowledge bases from (Rosati 2006). G-hybrid knowledge bases enable an integration of Description Logics and Logic Programming where, unlike in other approaches, variables in the rules of a guarded program do not need to appear in positive non-DL atoms of the body, i.e. DL atoms can act as guards as well. Decidability of satisfiability checking of g-hybrid knowledge bases is shown for the particular DL DLRO, which is close to OWL DL, by a reduction to guarded programs under the open answer set semantics. Moreover, we show 2-EXPTIME-completeness for satisfiability checking of such g-hybrid knowledge bases. Finally, we discuss advantages and disadvantages of our approach compared with DL+log knowledge bases.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 10:49:56 GMT" } ]
2007-11-15T00:00:00
[ [ "Heymans", "Stijn", "" ], [ "de Bruijn", "Jos", "" ], [ "Predoiu", "Livia", "" ], [ "Feier", "Cristina", "" ], [ "Van Nieuwenborgh", "Davy", "" ] ]
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711.2156
Yu Xin
Y. Xin, L. Deng, R. de Grijs, A. D. Mackey, and Z. Han
Simple Stellar Population Models as probed by the Large Magellanic Cloud Star Cluster ESO 121-SC03
11 pages, 7 figures, 2 tables, accepted for publication in MNRAS
null
10.1111/j.1365-2966.2007.12720.x
null
astro-ph
null
The presence of blue straggler stars (BSs) in star clusters has proven a challenge to conventional simple stellar population (SSP) models. Conventional SSP models are based on the evolution theory of single stars. Meanwhile, the typical locations of BSs in the colour-magnitude diagram of a cluster are brighter and bluer than the main sequence turn-off point. Such loci cannot be predicted by single-star evolution theory. However, stars with such properties contribute significantly to the integrated light of the cluster. In this paper, we reconstruct the integrated properties of the Large Magellanic Cloud cluster ESO 121-SC03, based on a detailed exploration of the individual cluster stars, and with particular emphasis on the cluster's BSs. We find that the integrated light properties of ESO 121-SC03 are dramatically modified by its BS component. The integrated spectral energy distribution (ISED) flux level is significantly enhanced toward shorter wavelengths, and all broad-band colours become bluer. When fitting the fully integrated ISED of this cluster based on conventional SSP models, the best-fitting values of age and metallicity are significantly underestimated compared to the true cluster parameters. The age underestimate is $\sim40$ per cent if we only include the BSs within the cluster's half-light radius and $\sim60$ per cent if all BSs are included. The corresponding underestimates of the cluster's metallicity are $\sim30$ and $\sim60$ per cent, respectively. The populous star clusters in the Magellanic Clouds are ideal objects to explore the potential importance of BSs for the integrated light properties of more distant unresolved star clusters in a statistically robust manner, since they cover a large range in age and metallicity.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 10:50:27 GMT" } ]
2009-11-13T00:00:00
[ [ "Xin", "Y.", "" ], [ "Deng", "L.", "" ], [ "de Grijs", "R.", "" ], [ "Mackey", "A. D.", "" ], [ "Han", "Z.", "" ] ]
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711.2157
Bodo Manthey
Bodo Manthey
On Approximating Multi-Criteria TSP
Preliminary version at STACS 2009. This paper is a revised full version, where some proofs are simplified
null
null
null
cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present approximation algorithms for almost all variants of the multi-criteria traveling salesman problem (TSP). First, we devise randomized approximation algorithms for multi-criteria maximum traveling salesman problems (Max-TSP). For multi-criteria Max-STSP, where the edge weights have to be symmetric, we devise an algorithm with an approximation ratio of 2/3 - eps. For multi-criteria Max-ATSP, where the edge weights may be asymmetric, we present an algorithm with a ratio of 1/2 - eps. Our algorithms work for any fixed number k of objectives. Furthermore, we present a deterministic algorithm for bi-criteria Max-STSP that achieves an approximation ratio of 7/27. Finally, we present a randomized approximation algorithm for the asymmetric multi-criteria minimum TSP with triangle inequality Min-ATSP. This algorithm achieves a ratio of log n + eps.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 10:53:49 GMT" }, { "version": "v2", "created": "Wed, 19 Nov 2008 09:20:10 GMT" }, { "version": "v3", "created": "Wed, 13 Jul 2011 12:29:45 GMT" } ]
2011-07-14T00:00:00
[ [ "Manthey", "Bodo", "" ] ]
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711.2158
Grigori Rozenblum
Grigori Rozenblum, Alexander V. Sobolev
Discrete spectrum distribution of the Landau Operator Perturbed by an Expanding Electric Potential
22 pages, AMSLaTEX
null
null
null
math.SP math-ph math.MP
null
Under a perturbation by a decaying electric potential, the Landau Hamiltonian acquires some discrete eigenvalues between the Landau levels. We study the perturbation by an "expanding" electric potential $V(t^{-1}x)$, $t>0$, and derive a quasi-classical formula for the counting function of the discrete spectrum as $t\to \infty$.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 10:55:57 GMT" } ]
2007-11-15T00:00:00
[ [ "Rozenblum", "Grigori", "" ], [ "Sobolev", "Alexander V.", "" ] ]
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711.2159
Slava Khruschev
V. V. Khruschov
Fundamental interactions in quantum phase space specified by extra dimensional constants
5 pages, reference added, style corrected
Grav.Cosmol.13:259-261,2007
null
null
hep-th
null
A generalized algebra of quantum observables, depending on extra dimensional constants, is considered. Some limiting forms of the algebra are investigated and their possible applications to the descriptions of interactions of fundamental particles are proposed. A relation between current and constituent quark masses is found using a modified quark equation of Dirac-Gursey-Lee type and restrictions on the results of simultaneous measurements of momentum components are pointed out.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 10:57:23 GMT" }, { "version": "v2", "created": "Tue, 18 Dec 2007 16:45:55 GMT" } ]
2008-11-26T00:00:00
[ [ "Khruschov", "V. V.", "" ] ]
[ -0.0257015117, -0.0105922529, -0.0551629886, 0.0609669648, -0.0224336218, 0.0487029143, -0.0328807756, -0.0106868828, -0.0597052313, 0.0435045697, -0.0374734849, -0.0524376445, -0.0379781798, 0.0885736942, 0.0489804931, 0.0353790075, 0.008750122, 0.152114585, 0.1355606467, 0.0688906461, -0.0373725481, -0.1197132766, 0.0300797261, 0.0750983804, -0.0742404014, -0.1146663427, 0.0503684022, -0.028212361, 0.0663167164, 0.0070909425, 0.0824669003, -0.0435550399, -0.0377763025, -0.0085545536, -0.0421671346, 0.0873119608, -0.0288432278, 0.0820631459, -0.0814070478, 0.0642474666, 0.0017427694, -0.0110212425, -0.077319026, 0.122337684, 0.0092611238, -0.0307862982, -0.0269253924, -0.0521348268, -0.0048355935, -0.0580397397, -0.0060437033, -0.0039303, 0.0862016305, -0.0435298048, -0.0368678533, 0.0108950688, 0.0270768013, 0.0072865109, -0.0190647934, 0.0850408375, -0.0470878929, -0.102351822, -0.0520843603, 0.1224386171, -0.163318783, 0.0361360461, -0.0187367424, 0.0388361588, 0.0281114224, 0.0388109237, -0.0325022563, 0.0458261594, 0.0576359853, 0.0970020741, 0.0497627705, -0.0225724131, 0.0053245155, 0.0801957846, 0.0082201939, 0.0562733151, -0.0295750331, 0.0054349173, 0.0178156774, 0.0061730314, -0.0433783978, 0.0365650356, 0.0369435586, 0.0601594523, -0.0612697788, -0.0312152877, 0.0413343906, 0.021361148, -0.0600080453, 0.0473907106, 0.0808518827, -0.0863530412, 0.118199192, -0.0486019738, -0.0416624397, -0.0538003184, -0.0496870652, -0.0425204188, 0.0125542488, -0.0138033647, 0.1515089571, -0.0053655216, 0.0034256065, -0.0334864073, -0.0552639291, -0.0111221811, -0.0045927102, 0.0698495656, -0.0617744736, 0.0208059847, -0.0983142778, -0.115574792, -0.09084481, -0.0131598804, -0.1255677193, 0.1187038869, -0.0427980013, 0.0059396103, 0.115574792, -0.0320227966, 0.034117274, -0.106894061, 0.000410852, -0.1024022922, -0.1570605934, 0.0449681804, 0.0995255411, -0.0057913568, -0.0368678533, -0.0369940251, -0.0233042184, -0.0471635982, 0.0453467034, -0.0304330122, 0.0504441038, -0.0373977795, 0.025512252, -0.0337387547, 0.1077015698, 0.0497627705, 0.0452962331, 0.1308165342, 0.0065610143, -0.0270768013, 0.0900373012, -0.0961945653, -0.0078606, -0.0487029143, 0.0545068868, 0.0892297924, -0.0241621975, -0.0345462635, 0.0345210284, 0.1053799838, -0.0222443622, 0.0249192361, 0.0250454098, -0.0269758627, 0.0372211374, 0.0098982994, 0.1000302359, -0.0442868471, -0.1402038336, -0.0772685632, -0.0425204188, -0.1018975973, 0.0069142994, -0.1044715345, -0.1152719706, -0.0001872886, 0.0722216293, -0.0129453856, -0.009198037, -0.1456545144, -0.0836781636, 0.039038036, 0.0717674047, 0.0057976656, 0.0362622216, -0.052336704, -0.0250832625, 0.0673765689, 0.0215251744, 0.064550288, 0.0170460194, 0.0065988661, -0.0105480924, 0.0812051669, 0.1100231633, 0.1145654023, 0.1219339296, -0.0935196877, -0.0049428409, 0.0495861284, 0.0973048881, -0.0068512131, 0.0259664748, 0.0064569213, 0.0429241732, -0.1417179108, -0.0369435586, -0.0267739855, 0.1622084528, 0.0181563459, -0.0869586766, -0.0757544786, 0.0499141775, -0.0228373762, -0.0117972083, 0.0154183833, -0.0078290561, 0.0266730469, -0.0735338256, 0.0508730933, -0.0757040083, 0.0089519992, -0.0559704974, 0.1195113957, 0.0767638683, 0.0596547611, -0.0010267356, 0.0196325742, 0.0478701703, -0.028212361, 0.0199984759, 0.0113366758, 0.0108193653, 0.0693448707, -0.0624305755, -0.0475925878, -0.0601594523, -0.0096964221, -0.0142449709, 0.0193928443, -0.0202382058, -0.0477439947, 0.0132355848, 0.0341677442, -0.0144847007, 0.1071968749, -0.0025297757, 0.0177778248, -0.0173866879, 0.0269253924, 0.0234303903, 0.0015172345, -0.0002844815, 0.1134550795, -0.0400474221, 0.0336125791, -0.0529928058, -0.005488541 ]
711.216
Akira Sekiyama
M. Uruma, A. Sekiyama, H. Fujiwara, M. Yano, H. Fujita, S. Imada, T. Muro, I. A. Nekrasov, Y. Maeno, S. Suga
Three-Dimensional Bulk Electronic Structures of Ca1.5Sr0.5RuO4 Studied by Soft X-ray Angle-Resolved Photoemission
4 pages, 3 figures
null
null
null
cond-mat.str-el cond-mat.supr-con
null
We report on experimental data of the three-dimensional bulk Fermi surfaces of the layered strongly correlated Ca1.5Sr0.5RuO4 system. The measurements have been performed by means of hn-depndent bulk-sensitive soft x-ray angle-resolved photoemission technique. Our experimental data evinces the bulk Fermi surface topology at kz~0 to be qualitatively different from the one observed by surface-sensitive low-energy ARPES. Furthermore, stronger kz dispersion of the circle-like gamma Fermi surface sheet is observed compared with Sr2RuO4. Thus in the paramagnetic metal phase, Ca1.5Sr0.5RuO4 compound is found to have rather three-dimensional electronic structure.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 11:16:13 GMT" } ]
2007-11-15T00:00:00
[ [ "Uruma", "M.", "" ], [ "Sekiyama", "A.", "" ], [ "Fujiwara", "H.", "" ], [ "Yano", "M.", "" ], [ "Fujita", "H.", "" ], [ "Imada", "S.", "" ], [ "Muro", "T.", "" ], [ "Nekrasov", "I. A.", "" ], [ "Maeno", "Y.", "" ], [ "Suga", "S.", "" ] ]
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711.2161
H. Suderow
I. Guillamon, H. Suderow, F. Guinea, S. Vieira
Intrinsic atomic scale modulations of the superconducting gap of 2H-NbSe2
9 pages, 5 figures. Discussion extended, references added, one more figure
Phys. Rev. B 77, 134505 (2008)
10.1103/PhysRevB.77.134505
null
cond-mat.supr-con cond-mat.str-el
null
We present scanning tunneling microscopy and spectroscopy measurements at 100mK in the superconducting material 2H-NbSe2 that show well defined features in the superconducting density of states changing in a pattern closely following atomic periodicity. Our experiment demonstrates that the intrinsic superconducting density of states can show atomic size modulations, which reflect the reciprocal space structure of the superconducting gap. In particular we obtain that the superconducting gap of 2H-NbSe2 has six fold modulated components at 0.75 mV and 1.2 mV.Moreover, we also find related atomic size modulations inside vortices, demonstrating that the much discussed star shape vortex structure produced by localized states inside the vortex cores, has a, hitherto undetected, superposed atomic size modulation. The tip substrate interaction in an anisotropic superconductor has been calculated, giving position dependent changes related to the observed gap anisotropy.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 11:09:02 GMT" }, { "version": "v2", "created": "Tue, 8 Apr 2008 06:08:18 GMT" } ]
2009-11-13T00:00:00
[ [ "Guillamon", "I.", "" ], [ "Suderow", "H.", "" ], [ "Guinea", "F.", "" ], [ "Vieira", "S.", "" ] ]
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711.2162
Juan Li
Rainer Buckdahn, Boualem Djehiche, Juan Li, Shige Peng
Mean-field backward stochastic differential equations: A limit approach
Published in at http://dx.doi.org/10.1214/08-AOP442 the Annals of Probability (http://www.imstat.org/aop/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Annals of Probability 2009, Vol. 37, No. 4, 1524-1565
10.1214/08-AOP442
IMS-AOP-AOP442
math.PR math.SG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Mathematical mean-field approaches play an important role in different fields of Physics and Chemistry, but have found in recent works also their application in Economics, Finance and Game Theory. The objective of our paper is to investigate a special mean-field problem in a purely stochastic approach: for the solution $(Y,Z)$ of a mean-field backward stochastic differential equation driven by a forward stochastic differential of McKean--Vlasov type with solution $X$ we study a special approximation by the solution $(X^N,Y^N,Z^N)$ of some decoupled forward--backward equation which coefficients are governed by $N$ independent copies of $(X^N,Y^N,Z^N)$. We show that the convergence speed of this approximation is of order $1/\sqrt{N}$. Moreover, our special choice of the approximation allows to characterize the limit behavior of $\sqrt{N}(X^N-X,Y^N-Y,Z^N-Z)$. We prove that this triplet converges in law to the solution of some forward--backward stochastic differential equation of mean-field type, which is not only governed by a Brownian motion but also by an independent Gaussian field.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 11:13:27 GMT" }, { "version": "v2", "created": "Wed, 27 Feb 2008 05:27:04 GMT" }, { "version": "v3", "created": "Fri, 28 Aug 2009 08:13:52 GMT" } ]
2009-08-28T00:00:00
[ [ "Buckdahn", "Rainer", "" ], [ "Djehiche", "Boualem", "" ], [ "Li", "Juan", "" ], [ "Peng", "Shige", "" ] ]
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711.2163
Filipe Abdalla B.
F. B. Abdalla, A. Mateus, W. A. Santos, L. Sodre Jr, I. Ferreras, O. Lahav
Predicting spectral features in galaxy spectra from broad-band photometry
10 pages 7 figures summitted to MNRAS
null
10.1111/j.1365-2966.2008.12881.x
null
astro-ph
null
We explore the prospects of predicting emission line features present in galaxy spectra given broad-band photometry alone. There is a general consent that colours, and spectral features, most notably the 4000 A break, can predict many properties of galaxies, including star formation rates and hence they could infer some of the line properties. We argue that these techniques have great prospects in helping us understand line emission in extragalactic objects and might speed up future galaxy redshift surveys if they are to target emission line objects only. We use two independent methods, Artifical Neural Neworks (based on the ANNz code) and Locally Weighted Regression (LWR), to retrieve correlations present in the colour N-dimensional space and to predict the equivalent widths present in the corresponding spectra. We also investigate how well it is possible to separate galaxies with and without lines from broad band photometry only. We find, unsurprisingly, that recombination lines can be well predicted by galaxy colours. However, among collisional lines some can and some cannot be predicted well from galaxy colours alone, without any further redshift information. We also use our techniques to estimate how much information contained in spectral diagnostic diagrams can be recovered from broad-band photometry alone. We find that it is possible to classify AGN and star formation objects relatively well using colours only. We suggest that this technique could be used to considerably improve redshift surveys such as the upcoming FMOS survey and the planned WFMOS survey.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 11:14:55 GMT" } ]
2009-11-13T00:00:00
[ [ "Abdalla", "F. B.", "" ], [ "Mateus", "A.", "" ], [ "Santos", "W. A.", "" ], [ "Sodre", "L.", "Jr" ], [ "Ferreras", "I.", "" ], [ "Lahav", "O.", "" ] ]
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711.2164
Murach Aleksandr
Vladimir A. Mikhailets, Alexandr A. Murach
Elliptic systems of pseudodifferential equations in a refined scale on a closed manifold
null
Extended variant is published in: Bull. Pol. Acad. Sci. Math., 56 (2008), no. 3 -- 4, 213 -- 224.
null
null
math.AP
null
We study a system of pseudodifferential equations that is elliptic in the sense of Petrovskii on a closed compact smooth manifold. We prove that the operator generated by the system is Fredholm one on a refined two-sided scale of the functional Hilbert spaces. Elements of this scale are the special isotropic spaces of H\"{o}rmander--Volevich--Paneah.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 11:22:11 GMT" } ]
2009-03-30T00:00:00
[ [ "Mikhailets", "Vladimir A.", "" ], [ "Murach", "Alexandr A.", "" ] ]
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711.2165
Marcelo Kuperman
M.N. Kuperman, S. Risau Gusman
The effect of the topology on the spatial ultimatum game
6 pages, 5 figures
null
10.1140/epjb/e2008-00133-x
null
nlin.AO nlin.CG
null
In this work we present an analysis of a spatially non homogeneous ultimatum game. By considering different underlying topologies as substrates on top of which the game takes place we obtain nontrivial behaviors for the evolution of the strategies of the players. We analyze separately the effect of the size of the neighborhood and the spatial structure. Whereas this last effect is the most significant one, we show that even for disordered networks and provided the neighborhood of each site is small, the results can be significantly different from those obtained in the case of fully connected networks.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 11:22:51 GMT" } ]
2009-11-13T00:00:00
[ [ "Kuperman", "M. N.", "" ], [ "Gusman", "S. Risau", "" ] ]
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711.2166
Nikola Vitas
N. Vitas (1 and 2), I. Vince (2 and 3), M. Lugaro (1 and 4), O. Andriyenko (5 and 6), M. Gosic (2) and R. J. Rutten (1 and 7) ((1) Sterrekundig Instituut, Utrecht University, The Netherlands, (2) Department of Astronomy, University of Belgrade, Serbia, (3) Astronomical Observatory, Belgrade, Serbia, (4) Center for Stellar Planetary Astrophysics, Monash University, Australia, (5) ICAMER, NASU, Kyiv, Ukraine, (6) Main Astronomical Observatory, NASU, Kyiv, Ukraine, (7) Institutt for Teoretisk Astrofysikk, University of Oslo, Norway)
On the solar abundance of indium
7 pages, 9 figures, accepted for publication in MNRAS Main Journal
null
10.1111/j.1365-2966.2007.12708.x
null
astro-ph
null
The generally adopted value for the solar abundance of indium is over six times higher than the meteoritic value. We address this discrepancy through numerical synthesis of the 451.13 nm line on which all indium abundance studies are based, both for the quiet-sun and the sunspot umbra spectrum, employing standard atmosphere models and accounting for hyperfine structure and Zeeman splitting in detail. The results, as well as a re-appraisal of indium nucleosynthesis, suggest that the solar indium abundance is close to the meteoritic value, and that some unidentified ion line causes the 451.13 nm feature in the quiet-sun spectrum.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 11:24:34 GMT" } ]
2009-11-13T00:00:00
[ [ "Vitas", "N.", "", "1 and 2" ], [ "Vince", "I.", "", "2 and 3" ], [ "Lugaro", "M.", "", "1 and 4" ], [ "Andriyenko", "O.", "", "5 and 6" ], [ "Gosic", "M.", "", "1 and 7" ], [ "Rutten", "R. J.", "", "1 and 7" ] ]
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711.2167
Juan Li
Rainer Buckdahn, Juan Li, Shige Peng
Mean-Field Backward Stochastic Differential Equations and Related Partial Differential Equations
The results were presented by Rainer Buckdahn at the Mittag-Leffler Institute (Stockholm, Sweden) in November 8th, 2007. The paper was submitted
null
null
null
math.PR math.SG
null
In [5] the authors obtained Mean-Field backward stochastic differential equations (BSDE) associated with a Mean-field stochastic differential equation (SDE) in a natural way as limit of some highly dimensional system of forward and backward SDEs, corresponding to a large number of ``particles'' (or ``agents''). The objective of the present paper is to deepen the investigation of such Mean-Field BSDEs by studying them in a more general framework, with general driver, and to discuss comparison results for them. In a second step we are interested in partial differential equations (PDE) whose solutions can be stochastically interpreted in terms of Mean-Field BSDEs. For this we study a Mean-Field BSDE in a Markovian framework, associated with a Mean-Field forward equation. By combining classical BSDE methods, in particular that of ``backward semigroups" introduced by Peng [14], with specific arguments for Mean-Field BSDEs we prove that this Mean-Field BSDE describes the viscosity solution of a nonlocal PDE. The uniqueness of this viscosity solution is obtained for the space of continuous functions with polynomial growth. With the help of an example it is shown that for the nonlocal PDEs associated to Mean-Field BSDEs one cannot expect to have uniqueness in a larger space of continuous functions.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 11:34:11 GMT" } ]
2007-11-21T00:00:00
[ [ "Buckdahn", "Rainer", "" ], [ "Li", "Juan", "" ], [ "Peng", "Shige", "" ] ]
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711.2168
Frithjof Anders
Frithjof B. Anders, David E. Logan, Martin R. Galpin, Gleb Finkelstein
Zero-bias conductance in carbon nanotube quantum dots
4 pages, 5 figures
Phys. Rev. Lett. 100, 086809 (2008)
10.1103/PhysRevLett.100.086809
null
cond-mat.mes-hall cond-mat.str-el
null
We present numerical renormalization group calculations for the zero-bias conductance of quantum dots made from semiconducting carbon nanotubes. These explain and reproduce the thermal evolution of the conductance for different groups of orbitals, as the dot-lead tunnel coupling is varied and the system evolves from correlated Kondo behavior to more weakly correlated regimes. For integer fillings $N=1,2,3$ of an SU(4) model, we find universal scaling behavior of the conductance that is distinct from the standard SU(2) universal conductance, and concurs quantitatively with experiment. Our results also agree qualitatively with experimental differential conductance maps.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 11:36:44 GMT" }, { "version": "v2", "created": "Sat, 15 Mar 2008 15:50:01 GMT" } ]
2008-03-15T00:00:00
[ [ "Anders", "Frithjof B.", "" ], [ "Logan", "David E.", "" ], [ "Galpin", "Martin R.", "" ], [ "Finkelstein", "Gleb", "" ] ]
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711.2169
Dmitry Korshunov A.
Dmitry Korshunov
The Key Renewal Theorem for a Transient Markov Chain
12 pages
null
null
null
math.PR
null
We consider a time-homogeneous Markov chain $X_n$, $n\ge0$, valued in ${\bf R}$. Suppose that this chain is transient, that is, $X_n$ generates a $\sigma$-finite renewal measure. We prove the key renewal theorem under condition that this chain has asymptotically homogeneous at infinity jumps and asymptotically positive drift.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 11:42:16 GMT" } ]
2007-11-15T00:00:00
[ [ "Korshunov", "Dmitry", "" ] ]
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711.217
Carsten Gundlach
Carsten Gundlach
Summary of GR18 Numerical Relativity parallel sessions (B1/B2 and B2), Sydney, 8-13 July 2007
References updated, to be published in CQG
Class.Quant.Grav.25:114019,2008
10.1088/0264-9381/25/11/114019
null
gr-qc
null
The numerical relativity session at GR18 was dominated by physics results on binary black hole mergers. Several groups can now simulate these from a time when the post-Newtonian equations of motion are still applicable, through several orbits and the merger to the ringdown phase, obtaining plausible gravitational waves at infinity, and showing some evidence of convergence with resolution. The results of different groups roughly agree. This new-won confidence has been used by these groups to begin mapping out the (finite-dimensional) initial data space of the problem, with a particular focus on the effect of black hole spins, and the acceleration by gravitational wave recoil to hundreds of km/s of the final merged black hole. Other work was presented on a variety of topics, such as evolutions with matter, extreme mass ratio inspirals, and technical issues such as gauge choices.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 11:42:51 GMT" }, { "version": "v2", "created": "Fri, 11 Jan 2008 10:46:20 GMT" } ]
2008-11-26T00:00:00
[ [ "Gundlach", "Carsten", "" ] ]
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711.2171
Angela Bragaglia
Angela Bragaglia (INAF - Osservatorio Astronomico di Bologna)
The Bologna Open Clusters Chemical Evolution project (in short: BOCCE)
5 pages, proceedings of "XXI Century challenges for stellar evolution" (Cefalu', Italy), eds. S. Cassisi and M. Salaris, to be published in MemSAIt, 79, 2
null
null
null
astro-ph
null
I present here our project, the Bologna Open Clusters Chemical Evolution (BOCCE) project, aimed at using Open Clusters as tracers of the disk properties and their evolution with time. We are collecting and homogeneously analyzing data, both photometric and spectroscopic, on a large sample of open clusters, representative of the old cluster population, and I show here results obtained on a subset of our clusters.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 11:47:42 GMT" } ]
2007-11-15T00:00:00
[ [ "Bragaglia", "Angela", "", "INAF - Osservatorio Astronomico di Bologna" ] ]
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711.2172
Jan Pomplun
Jan Pomplun, Lin Zschiedrich, Roland Klose, Frank Schmidt, Sven Burger
Finite Element simulation of radiation losses in photonic crystal fibers
null
phys. stat. sol. (a) 204, No. 11, 3822-3837 (2007)
10.1002/pssa.200776414
null
physics.optics
null
In our work we focus on the accurate computation of light propagation in finite size photonic crystal structures with the finite element method (FEM). We discuss how we utilize numerical concepts like high-order finite elements, transparent boundary conditions and goal-oriented error estimators for adaptive grid refinement in order to compute radiation leakage in photonic crystal fibers and waveguides. Due to the fast convergence of our method we can use it e.g. to optimize the design of photonic crystal structures with respect to geometrical parameters, to minimize radiation losses and to compute attenutation spectra for different geometries.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 11:51:16 GMT" } ]
2015-05-13T00:00:00
[ [ "Pomplun", "Jan", "" ], [ "Zschiedrich", "Lin", "" ], [ "Klose", "Roland", "" ], [ "Schmidt", "Frank", "" ], [ "Burger", "Sven", "" ] ]
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711.2173
Ludwik Turko
Ludwik Turko
Statistical ensemble equivalence problem
5 pages, Talk given at the conference ''New Trends in High Energy Physics'', Crimea 2007, Yalta, 15-22 September 2007
null
null
null
hep-th cond-mat.stat-mech
null
A problem of the equivalence of statistical ensembles is critically analyzed. It is shown, that although different probability distributions of statistical physics have the same behavior in the thermodynamic limit, there are physical observables -- semi-intensive variables -- which keep memory of the underlying ensembles. This property is an universal one and can be observed even in the simplest case of the grand canonical and canonical ensembles of the classical statistical physics.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 11:55:27 GMT" } ]
2007-11-17T00:00:00
[ [ "Turko", "Ludwik", "" ] ]
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711.2174
Roger Horsley
V.M. Braun, D. Br\"ommel, M. G\"ockeler, R. Horsley, Y. Nakamura, H. Perlt, D. Pleiter, P.E.L. Rakow, A. Sch\"afer, G. Schierholz, A. Schiller, W. Schroers, T. Streuer, H. St\"uben, J.M. Zanotti
Distribution Amplitudes of Vector Mesons
7 pages, 5 figures, Contribution to Lattice 2007, Regensburg, Germany, 30 July - 4 August 2007
PoSLAT2007:144,2007
null
DESY 07-177, Edinburgh 2007/28, Liverpool LTH 776
hep-lat
null
Results are presented for the lowest moment of the distribution amplitude for the K-star vector meson. Both longitudinal and transverse moments are investigated. We use two flavours of O(a) improved Wilson fermions, together with a non-perturbative renormalisation of the matrix element.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 12:02:27 GMT" } ]
2008-11-26T00:00:00
[ [ "Braun", "V. M.", "" ], [ "Brömmel", "D.", "" ], [ "Göckeler", "M.", "" ], [ "Horsley", "R.", "" ], [ "Nakamura", "Y.", "" ], [ "Perlt", "H.", "" ], [ "Pleiter", "D.", "" ], [ "Rakow", "P. E. L.", "" ], [ "Schäfer", "A.", "" ], [ "Schierholz", "G.", "" ], [ "Schiller", "A.", "" ], [ "Schroers", "W.", "" ], [ "Streuer", "T.", "" ], [ "Stüben", "H.", "" ], [ "Zanotti", "J. M.", "" ] ]
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711.2175
Ashley Willis
Yohann Duguet, Ashley P. Willis and Rich R. Kerswell
Transition in pipe flow: the saddle structure on the boundary of turbulence
24 pages, 14 figures. Accepted, Jou. Fluid Mech
null
10.1017/S0022112008003248
null
physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The laminar-turbulent boundary S is the set separating initial conditions which relaminarise uneventfully from those which become turbulent. Phase space trajectories on this hypersurface in cylindrical pipe flow look to be chaotic and show recurring evidence of coherent structures. A general numerical technique is developed for recognising approaches to these structures and then for identifying the exact coherent solutions themselves. Numerical evidence is presented which suggests that trajectories on S are organised around only a few travelling waves and their heteroclinic connections. If the flow is suitably constrained to a subspace with a discrete rotational symmetry, it is possible to find locally-attracting travelling waves embedded within S. Four new types of travelling waves were found using this approach.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 12:09:11 GMT" }, { "version": "v2", "created": "Tue, 1 Jul 2008 12:10:34 GMT" } ]
2015-05-13T00:00:00
[ [ "Duguet", "Yohann", "" ], [ "Willis", "Ashley P.", "" ], [ "Kerswell", "Rich R.", "" ] ]
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711.2176
Dmitri Volchenkov
Philippe Blanchard, Dimitry Volchenkov
Modelling Complex Networks: Cameo Graphs And Transport Processes
24 pages, 7 figures, a contribution for the book of servey papers, Stochastic Networks and Internet Technology, edited by Scuola Normale Superiore, Pisa (Italy)
null
null
null
physics.soc-ph physics.data-an
null
We discuss a model accounting for the creation and development of transport networks based on the Cameo principle which refers to the idea of distribution of resources, including land, water, minerals, fuel and wealth. We also give an outlook of the use of random walks as an effective tool for the investigation of network structures and its functional segmentation. In particular, we have studied the complex transport network of Venetian canals by means of random walks.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 12:12:20 GMT" } ]
2007-11-15T00:00:00
[ [ "Blanchard", "Philippe", "" ], [ "Volchenkov", "Dimitry", "" ] ]
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711.2177
Cesare Tronci
Darryl D. Holm, Lennon O. Naraigh, Cesare Tronci
Emergent singular solutions of non-local density-magnetization equations in one dimension
19 pages, 13 figures. Submitted to Phys. Rev. E
null
10.1103/PhysRevE.77.036211
null
nlin.AO
null
We investigate the emergence of singular solutions in a non-local model for a magnetic system. We study a modified Gilbert-type equation for the magnetization vector and find that the evolution depends strongly on the length scales of the non-local effects. We pass to a coupled density-magnetization model and perform a linear stability analysis, noting the effect of the length scales of non-locality on the system's stability properties. We carry out numerical simulations of the coupled system and find that singular solutions emerge from smooth initial data. The singular solutions represent a collection of interacting particles (clumpons). By restricting ourselves to the two-clumpon case, we are reduced to a two-dimensional dynamical system that is readily analyzed, and thus we classify the different clumpon interactions possible.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 12:18:28 GMT" } ]
2008-04-25T00:00:00
[ [ "Holm", "Darryl D.", "" ], [ "Naraigh", "Lennon O.", "" ], [ "Tronci", "Cesare", "" ] ]
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711.2178
Brett Hayes
Brett Hayes, Robert Brunner, Volodymyr Kindratenko
Angular Power Spectrum Estimation using High Performance Reconfigurable Computing
2 pages, In Proc. 3rd Annual Reconfigurable Systems Summer Institute - RSSI'07, 2007
null
null
null
astro-ph
null
Angular power spectra are an important measure of the angular clustering of a given distribution. In Cosmology, they are applied to such vastly different observations as galaxy surveys that cover a fraction of the sky and the Cosmic Microwave Background that covers the entire sky, to obtain fundamental parameters that determine the structure and evolution of the universe. The calculation of an angular power spectrum, however, is complex and the optimization of these calculations is a necessary consideration for current and forthcoming observational surveys. In this work, we present preliminary results of implementing angular power spectrum estimation scheme on a high-performance reconfigurable computing platform.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 12:18:50 GMT" } ]
2007-11-15T00:00:00
[ [ "Hayes", "Brett", "" ], [ "Brunner", "Robert", "" ], [ "Kindratenko", "Volodymyr", "" ] ]
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711.2179
Peter Klimek
Rudolf Hanel, Peter Klimek, and Stefan Thurner
Studies in the physics of evolution: creation, formation, destruction
11 pages, 10 figures, to be published in SPIE proceedings
null
10.1117/12.771146
null
q-bio.PE
null
The concept of (auto)catalytic systems has become a cornerstone in understanding evolutionary processes in various fields. The common ground is the observation that for the production of new species/goods/ideas/elements etc. the pre-existence of specific other elements is a necessary condition. In previous work some of us showed that the dynamics of the catalytic network equation can be understood in terms of topological recurrence relations paving a path towards the analytic tractability of notoriously high dimensional evolution equations. We apply this philosophy to studies in socio-physics, bio-diversity and massive events of creation and destruction in technological and biological networks. Cascading events, triggered by small exogenous fluctuations, lead to dynamics strongly resembling the qualitative picture of Schumpeterian economic evolution. Further we show that this new methodology allows to mathematically treat a variant of the threshold voter-model of opinion formation on networks. For fixed topology we find distinct phases of mixed opinions and consensus.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 12:22:46 GMT" } ]
2009-11-13T00:00:00
[ [ "Hanel", "Rudolf", "" ], [ "Klimek", "Peter", "" ], [ "Thurner", "Stefan", "" ] ]
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711.218
Dean McLaughlin
Dean E. McLaughlin, Pauline Barmby, William E. Harris, Duncan A. Forbes, and Gretchen L. H. Harris
Structural parameters for globular clusters in NGC 5128. III. ACS surface-brightness profiles and model fits
MNRAS, in press. 28 pages. Full data tables available at http://www.astro.keele.ac.uk/~dem/clusters.html
null
10.1111/j.1365-2966.2007.12566.x
null
astro-ph
null
We present internal surface-brightness profiles, based on HST/ACS imaging in the F606W bandpass, for 131 globular cluster (GC) candidates with luminosities 10^4 - 3 x 10^6 solar, in the giant elliptical galaxy NGC 5128. Several structural models are fit to the profile of each cluster and combined with mass-to-light ratios from population-synthesis models, to derive a catalogue of fundamental structural and dynamical parameters parallel in form to the catalogues recently produced by McLaughlin & van der Marel and Barmby et al. for GCs and massive young star clusters in Local Group galaxies. As part of this, we provide corrected and extended parameter estimates for another 18 clusters in NGC 5128, which we observed previously. We show that, like GCs in the Milky Way and some of its satellites, the majority of globulars in NGC 5128 are well fit by isotropic Wilson models, which have intrinsically more distended envelope structures than the standard King lowered isothermal spheres. We use our models to predict internal velocity dispersions for every cluster in our sample. These predictions agree well in general with the observed dispersions in a small number of clusters for which spectroscopic data are available. In a subsequent paper, we use these results to investigate scaling relations for GCs in NGC 5128.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 12:58:44 GMT" } ]
2009-11-13T00:00:00
[ [ "McLaughlin", "Dean E.", "" ], [ "Barmby", "Pauline", "" ], [ "Harris", "William E.", "" ], [ "Forbes", "Duncan A.", "" ], [ "Harris", "Gretchen L. H.", "" ] ]
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711.2181
Paul David Mitchener
Paul D. Mitchener
The $KH$-Isomorphism Conjecture and Algebraic $KK$-theory
null
null
null
null
math.KT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this article we prove that the $KH$-asembly map, as defined by Bartels and L{\"u}ck, can be described in terms of the algebraic $KK$-theory of Cortinas and Thom. The $KK$-theory description of the $KH$-assembly map is similar to that of the Baum-Connes assembly map. In very elementary cases, methods used to prove the Baum-Connes conjecture also apply to the $KH$-isomorphism conjecture.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 12:24:10 GMT" }, { "version": "v2", "created": "Wed, 14 Jan 2009 13:12:54 GMT" } ]
2009-01-14T00:00:00
[ [ "Mitchener", "Paul D.", "" ] ]
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711.2182
Paul David Mitchener
Paul D. Mitchener
Algebraic $K$-theory Spectra and Factorisations of Analytic Assembly Maps
null
null
null
null
math.KT
null
In this article we use existing machinery to define connective $K$-theory spectra associated to topological ringoids. Algebraic $K$-theory of discrete ringoids, and the analytic $K$-theory of Banach categories are obtained as special cases. As an application, we show how the analytic assembly maps featuring in the Novikov and Baum-Connes conjectures can be factorised into composites of assembly maps resembling those appearing in algebraic $K$-theory and maps coming from completions of certain topological ringoids into Banach categories. These factorisations are proved by using existing characterisations of assembly maps along with our unified picture of algebraic and analytic $K$-theory.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 12:31:43 GMT" } ]
2007-11-15T00:00:00
[ [ "Mitchener", "Paul D.", "" ] ]
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711.2183
Hung The Diep
Miron Kaufman and H. T. Diep
Potts-Percolation-Gauss Model of a Solid
10 pages, 12 figures
null
10.1088/0953-8984/20/7/075222
null
cond-mat.stat-mech
null
We study a statistical mechanics model of a solid. Neighboring atoms are connected by Hookian springs. If the energy is larger than a threshold the "spring" is more likely to fail, while if the energy is lower than the threshold the spring is more likely to be alive. The phase diagram and thermodynamic quantities, such as free energy, numbers of bonds and clusters, and their fluctuations, are determined using renormalization-group and Monte-Carlo techniques.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 12:37:31 GMT" } ]
2009-11-13T00:00:00
[ [ "Kaufman", "Miron", "" ], [ "Diep", "H. T.", "" ] ]
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711.2184
Markus Diehl
Markus Diehl and Wolfgang Kugler
Some numerical studies of the evolution of generalized parton distributions
12 pages, 12 figures. v2: added comments on power-law behavior
Phys.Lett.B660:202-211,2008
10.1016/j.physletb.2007.12.047
DESY 07-195
hep-ph
null
We study the evolution behavior of generalized parton distributions at small longitudinal momentum fraction. Particular attention is paid to the ratio of a generalized parton distribution and its forward limit, to the mixing between quarks and gluons, and to the dependence on the squared momentum transfer t.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 13:06:42 GMT" }, { "version": "v2", "created": "Tue, 8 Jan 2008 15:24:34 GMT" } ]
2008-11-26T00:00:00
[ [ "Diehl", "Markus", "" ], [ "Kugler", "Wolfgang", "" ] ]
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711.2185
Adam Shwartz
Arie Leizarowitz and Adam Shwartz
Exact finite approximations of average-cost countable Markov Decision Processes
Submitted to Automatica
null
null
null
math.PR math.OC
null
For a countable-state Markov decision process we introduce an embedding which produces a finite-state Markov decision process. The finite-state embedded process has the same optimal cost, and moreover, it has the same dynamics as the original process when restricting to the approximating set. The embedded process can be used as an approximation which, being finite, is more convenient for computation and implementation.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 12:45:11 GMT" } ]
2007-11-15T00:00:00
[ [ "Leizarowitz", "Arie", "" ], [ "Shwartz", "Adam", "" ] ]
[ -0.0305655766, 0.0072085219, -0.0027730865, 0.0156314913, -0.0269823577, -0.0178199001, 0.0955685303, 0.0968671441, -0.0962418839, 0.0959052071, 0.1167792603, -0.0351107344, -0.0245173927, 0.0367460288, 0.0442491435, -0.0712796003, 0.0468704216, -0.009871888, 0.080562301, -0.0129861617, -0.0615640245, -0.0315996595, -0.0354233608, 0.0062646205, -0.0352309756, -0.021054415, 0.0764740631, -0.1663190573, -0.0575719811, -0.0300605595, 0.0330666155, -0.0422531217, -0.0038778121, -0.0974443108, 0.0069199405, 0.0868629888, -0.0080562299, 0.0915283933, -0.0859972462, 0.1213003695, 0.0057385606, 0.0000196685, -0.1044664532, 0.1103342772, -0.0112246126, 0.1036969051, 0.0394875519, -0.0336678252, 0.0132506946, 0.081524238, -0.0862377286, 0.0808027834, -0.024024399, -0.1384228617, 0.0521370322, 0.0052966704, 0.0030646741, -0.0357600413, 0.1362104118, -0.0793117806, 0.0093608582, -0.0096314028, -0.0270785522, 0.0817166269, -0.003499049, 0.071808666, -0.1110076308, 0.0821975917, -0.0099440329, 0.0578605644, -0.1060055569, -0.0036703942, 0.0251787249, 0.0053387554, 0.0636802912, -0.0052395556, -0.0298200753, 0.0484335721, -0.0220884979, 0.120242238, -0.0017600458, -0.021631578, 0.0473754406, -0.0788308084, 0.0415557176, -0.0862858295, -0.0307579637, 0.044225093, -0.1072560772, -0.0203810595, -0.0705100447, 0.0495398007, -0.0044038719, -0.0400406644, 0.0939332321, -0.0644979328, 0.0309022553, 0.0217397958, 0.0697404966, -0.0865744129, -0.0439124629, -0.0048848409, 0.0463173091, -0.0914321989, 0.1463107467, -0.0238079634, 0.0257799346, 0.0740692168, -0.0137917846, 0.0378041603, -0.0275835693, -0.0091023371, -0.1308235526, 0.0644498393, 0.0396077931, -0.0304693822, -0.0882578045, -0.0232668724, -0.0389825329, -0.052329421, 0.0101845171, 0.0217157472, 0.0876806378, -0.0514155813, 0.055407621, -0.0580048561, 0.1036969051, -0.071760565, 0.0021267845, -0.1049474254, 0.0391749218, -0.0778688714, -0.0804180056, 0.0110983588, -0.0399685204, -0.0387420468, -0.0360486209, 0.0734439567, 0.0594958588, -0.1450602263, 0.0739730224, 0.0240965448, 0.0090121552, 0.0408583134, -0.0266216304, 0.034894295, -0.0920574591, 0.065123193, -0.0391989686, -0.0322008692, 0.0600249246, -0.0722415373, 0.0393192098, 0.0502612554, -0.0064690323, -0.0877768323, -0.0101604685, -0.0398242287, 0.0177237056, -0.0556962043, -0.0037425396, 0.0676723272, 0.0008755138, -0.1036969051, 0.0686823651, 0.1112000197, -0.0630069301, -0.0498283841, -0.0555038154, -0.0678647161, -0.0134310573, -0.0370827056, -0.0357119441, -0.0215233602, 0.0048908531, -0.16497235, -0.0553114265, -0.0770031288, 0.0459084846, 0.0419645384, -0.0189381521, -0.013996196, 0.0009296228, 0.0713276938, 0.0872477666, 0.0293631535, 0.0529546812, -0.0107737044, 0.1103342772, -0.0342690386, -0.0366017371, 0.0253711119, -0.0416278616, 0.0780612603, -0.1024463847, -0.0319844335, 0.071760565, -0.0115733156, 0.0939332321, -0.0537723266, 0.0165573563, -0.1434249431, 0.1298616081, 0.0394154042, 0.0757526085, 0.1176450029, 0.0017344942, -0.0005050174, -0.1052360013, -0.0047976654, 0.0441289023, -0.0081644477, 0.0290024281, -0.0656041652, -0.0089820949, 0.0865263119, 0.0413873792, 0.0906145498, -0.0189862493, 0.071808666, -0.0623816736, 0.0315756127, -0.0406178273, 0.0433833972, -0.078734614, -0.008194508, -0.0179882385, -0.0898450017, 0.0108278133, -0.0533875525, 0.0158118531, -0.0126975803, -0.1385190487, -0.0420366861, 0.057187207, 0.0725301132, -0.0105933407, -0.0631031245, -0.0168820098, -0.0800813287, -0.0685380772, -0.0215353835, -0.0006282657, -0.0571391098, -0.0013226646, 0.0423252657, -0.0830633342, 0.018661594, 0.0354474112, 0.0433593504, -0.0433593504, -0.0492512211, 0.0805142, 0.0213429965, -0.0422771685, -0.0738287345 ]
711.2186
Anne-Sophie Kaloghiros
Anne-Sophie Kaloghiros
The defect of Fano 3-folds
24 pages, minor changes in exposition, final version
null
null
null
math.AG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper studies the defect of terminal Gorenstein Fano 3 folds. I determine a bound on the defect of terminal Gorenstein Fano 3-folds of Picard rank 1 that do not contain a plane. I give a general bound for quartic 3-folds and indicate how to study the defect of terminal Gorenstein Fano 3-folds with Picard rank 1 that contain a plane.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 17:42:43 GMT" }, { "version": "v2", "created": "Thu, 31 Jul 2008 14:14:16 GMT" }, { "version": "v3", "created": "Mon, 24 Aug 2009 11:12:33 GMT" } ]
2009-08-24T00:00:00
[ [ "Kaloghiros", "Anne-Sophie", "" ] ]
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711.2187
Yi-Fu Cai
Yi-Fu Cai, Taotao Qiu, Robert Brandenberger, Yun-Song Piao, Xinmin Zhang
On Perturbations of Quintom Bounce
24 pages, 9 figures
JCAP0803:013,2008
10.1088/1475-7516/2008/03/013
null
hep-th astro-ph gr-qc hep-ph
null
A Quintom universe with an equation-of-state crossing the cosmological constant boundary can provide a bouncing solution dubbed the Quintom Bounce and thus resolve the Big Bang singularity. In this paper, we investigate the cosmological perturbations of the Quintom Bounce both analytically and numerically. We find that the fluctuations in the dominant mode in the post-bounce expanding phase couple to the growing mode of the perturbations in the pre-bounce contracting phase.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 17:57:48 GMT" }, { "version": "v2", "created": "Mon, 17 Mar 2008 18:04:04 GMT" } ]
2008-11-26T00:00:00
[ [ "Cai", "Yi-Fu", "" ], [ "Qiu", "Taotao", "" ], [ "Brandenberger", "Robert", "" ], [ "Piao", "Yun-Song", "" ], [ "Zhang", "Xinmin", "" ] ]
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711.2188
Adam Shwartz
Rami Atar and Adam Shwartz
Efficient routing in heavy traffic under partial sampling of service times
null
null
null
null
math.PR math.OC
null
We consider a queue with renewal arrivals and n exponential servers in the Halfin-Whitt heavy traffic regime, where n and the arrival rate increase without bound, so that a critical loading condition holds. Server k serves at rate $\mu_k $, and the empirical distribution of the $\mu_k $ is assumed to converge weakly. We show that very little information on the service rates is required for a routing mechanism to perform well. More precisely, we construct a routing mechanism that has access to a single sample from the service time distribution of each of $n$ to the power of $1/2 + \epsilon $ randomly selected servers, but not to the actual values of the service rates, the performance of which is asymptotically as good as the best among mechanisms that have the complete information on $ \mu_k $.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 12:59:20 GMT" } ]
2007-11-15T00:00:00
[ [ "Atar", "Rami", "" ], [ "Shwartz", "Adam", "" ] ]
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711.2189
Yoshiyuki Miyazaki
Y.Miyazaki, et al (Belle Collaboration)
Search for Lepton Flavor Violating tau Decays into Three Leptons
11 pages, 4 figures, submitted to Phys. Lett. B
Phys.Lett.B660:154-160,2008
10.1016/j.physletb.2007.12.046
Belle Preprint 2007-45, KEK Preprint 2007-57
hep-ex
null
We search for lepton-flavor-violating tau decays into three leptons (electron or muon) using 535 fb-1 of data collected with the Belle detector at the KEKB asymmetric-energy e+e- collider. No evidence for these decays is observed, and we set 90% confidence level upper limits on the branching fractions of (2.0-4.1)x10^-8. These results improve upon our previously published upper limits by factors of 4.9 to 10.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 13:01:31 GMT" }, { "version": "v2", "created": "Mon, 19 Nov 2007 07:24:30 GMT" } ]
2008-11-26T00:00:00
[ [ "Miyazaki", "Y.", "" ] ]
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711.219
Andreas Berthold Thom
Andreas Thom
Integer operators in finite von Neumann algebras
17 pages, no figures
null
null
null
math.FA math.NT
null
Motivated by the study of spectral properties of self-adjoint operators in the integral group ring of a sofic group, we define and study integer operators. We establish a relation with classical potential theory and in particular the circle of results obtained by M. Fekete and G. Szeg"o. More concretely, we use results by R. Rumely on equidistribution of algebraic integers to obtain a description of those integer operator which have spectrum of logarithmic capacity less or equal to one. Finally, we relate the study of integer operators to a recent construction by B. and L. Petracovici and A. Zaharescu.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 13:16:49 GMT" } ]
2007-11-15T00:00:00
[ [ "Thom", "Andreas", "" ] ]
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711.2191
Adam Shwartz
Adam Shwartz and Alan Weiss
Uniqueness of a constrained variational problem and large deviations of buffer size
null
null
null
null
math.PR math.OC
null
We show global uniqueness of the solution to a class of constrained variational problems, using scaling properties. This is used to establish the essential uniqueness of solutions of a large deviations problem in multiple dimensions. The result is motivated by models of buffers, and in particular the probability of, and typical path to overflow in the limit of small buffers, which we analyze.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 13:17:17 GMT" } ]
2007-11-15T00:00:00
[ [ "Shwartz", "Adam", "" ], [ "Weiss", "Alan", "" ] ]
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711.2192
Frithjof Brauer
F. Brauer, C.P. Dullemond, Th. Henning
Coagulation, fragmentation and radial motion of solid particles in protoplanetary disks
accepted for publication in A&A
null
10.1051/0004-6361:20077759
null
astro-ph
null
The growth of solid particles towards meter sizes in protoplanetary disks has to circumvent at least two hurdles, namely the rapid loss of material due to radial drift and particle fragmentation due to destructive collisions. In this paper, we present the results of numerical simulations with more and more realistic physics involved. Step by step, we include various effects, such as particle growth, radial/vertical particle motion and dust particle fragmentation in our simulations. We demonstrate that the initial dust-to-gas ratio is essential for the particles to overcome the radial drift barrier. If this value is increased by a factor of 2 compared with the canonical value for the interstellar medium, km-sized bodies can form in the inner disk <2 AU within 10 thousand years. However, we find that solid particles get destroyed through collisional fragmentation. Only with the unrealistically high-threshold velocities needed for fragmentation to occur (>30 m/s), particles are able to grow to larger sizes in low turbulent disks. We also find that less than 5% of the small dust grains remain in the disk after 1 Myrs due to radial drift, no matter whether fragmentation is included in the simulations or not. In this paper, we also present considerable improvements to existing algorithms for dust-particle coagulation, which speed up the coagulation scheme by a factor of 10 thousand.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 13:40:22 GMT" } ]
2009-11-13T00:00:00
[ [ "Brauer", "F.", "" ], [ "Dullemond", "C. P.", "" ], [ "Henning", "Th.", "" ] ]
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711.2193
Tsung-Shung Harry Lee
T.-S. H. Lee
Dynamical Coupled-Channels Analysis at EBAC
null
null
10.1088/1742-6596/69/1/012013
JLAB-THY-07-750
nucl-th
null
The status of dynamical coupled-channel analysis at Excited Baryon Analysis Center (EBAC) of Jefferson Laboratory is reported.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 13:24:53 GMT" } ]
2009-11-13T00:00:00
[ [ "Lee", "T. -S. H.", "" ] ]
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711.2194
Jun-Bao Wu
Bin Chen, Chang-Yong Liu, Jun-Bao Wu
Operator Product Expansion of Wilson surfaces from M5-branes
27 pages, no figures; typos corrected, references added, minor changes, 29 pages; typos fixed, JHEP published version
JHEP0801:007,2008
10.1088/1126-6708/2008/01/007
CAS-KITPC/ITP-018, SISSA-83/2007/EP
hep-th
null
The operator product expansion (OPE) of the Wilson surface operators in six-dimensional (2, 0) superconformal field theory is studied from AdS/CFT correspondence in this paper. We compute the OPE coefficients of the chiral primary operators using the M5-brane description for spherical Wilson surface operators in higher dimensional representations. We use the non-chiral M5-brane action in our calculation. We also discuss their membrane limit, and compare our results with the ones obtained from membrane description.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 13:26:12 GMT" }, { "version": "v2", "created": "Sun, 2 Dec 2007 12:06:41 GMT" }, { "version": "v3", "created": "Sat, 5 Jan 2008 09:57:56 GMT" } ]
2008-11-26T00:00:00
[ [ "Chen", "Bin", "" ], [ "Liu", "Chang-Yong", "" ], [ "Wu", "Jun-Bao", "" ] ]
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711.2195
Jan Christian Rohde
Jan Christian Rohde
Cyclic coverings, Calabi-Yau manifolds and Complex multiplication
151 pages, one reference added
null
null
null
math.AG
null
We construct families of Calabi-Yau manifolds with dense set of complex multiplication fibers in an arbitrary dimension. We will also give explicite examples of complex multiplication fibers. For this construction we use families of curves with dense set of complex multiplication fibers. In addition, we give examples of such families for each genus less or equal 7 and we study the generic Hodge groups of families of cyclic covers of the projective line.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 14:57:42 GMT" }, { "version": "v2", "created": "Fri, 23 Nov 2007 16:01:39 GMT" }, { "version": "v3", "created": "Fri, 22 Feb 2008 14:58:38 GMT" }, { "version": "v4", "created": "Mon, 3 Mar 2008 14:02:21 GMT" } ]
2008-03-03T00:00:00
[ [ "Rohde", "Jan Christian", "" ] ]
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711.2196
Leszek Motyka
J. Bartels and L. Motyka
Baryon scattering at high energies: wave function, impact factor, and gluon radiation
36 pages, 16 figures
Eur.Phys.J.C55:65-83,2008
10.1140/epjc/s10052-008-0572-z
DESY 07-198
hep-ph
null
The scattering of a baryon consisting of three massive quarks is investigated in the high energy limit of perturbative QCD. A model of a relativistic proton-like wave function, dependent on valence quark longitudinal and transverse momenta and on quark helicities, is proposed, and we derive the baryon impact factors for two, three and four t-channel gluons. We find that the baryonic impact factor can be written as a sum of three pieces: in the first one a subsystem consisting of two of the three quarks behaves very much like the quark-antiquark pair in gamma* scattering, whereas the third quark acts as a spectator. The second term belongs to the odderon, whereas in the third (C-even) piece all three quarks participate in the scattering. This term is new and has no analogue in gamma* scattering. We also study the small x evolution of gluon radiation for each of these three terms. The first term follows the same pattern of gluon radiation as the gamma*-initiated quark-antiquark dipole, and, in particular, it contains the BFKL evolution followed by the 2-->4 transition vertex (triple Pomeron vertex). The odderon-term is described by the standard BKP evolution, and the baryon couples to both known odderon solutions, the Janik-Wosiek solution and the BLV solution. Finally, the t-channel evolution of the third term starts with a three reggeized gluon state which then, via a new 3-->4 transition vertex, couples to the four gluon (two-Pomeron) state. We briefly discuss a few consequences of these findings, in particular the pattern of unitarization of high energy baryon scattering amplitudes.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 13:42:07 GMT" } ]
2014-11-18T00:00:00
[ [ "Bartels", "J.", "" ], [ "Motyka", "L.", "" ] ]
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711.2197
Su-Chan Park
Su-Chan Park and Hyunggyu Park
Nonequilibrium Phase Transitions into Absorbing States: Focused around the pair contact process with diffusion
Proceedings of STATPHY23. Submitted to EPJB
Eur. Phys. J. B 64, 415 (2008)
10.1140/epjb/e2008-00022-4
null
cond-mat.stat-mech
null
Systems with absorbing (trapped) states may exhibit a nonequilibrium phase transition from a noise-free inactive phase into an ever-lasting active phase. We briefly review the absorbing critical phenomena and universality classes, and discuss over the controversial issues on the pair contact process with diffusion (PCPD). Two different approaches are proposed to clarify its universality issue, which unveil strong evidences that the PCPD belongs to a new universality class other than the directed percolation class.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 13:38:58 GMT" } ]
2009-11-13T00:00:00
[ [ "Park", "Su-Chan", "" ], [ "Park", "Hyunggyu", "" ] ]
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711.2198
Stefano Ansoldi
Stefano Ansoldi, Eduardo I. Guendelman and Idan Shilon
Stability, Singularities and Mass Thresholds in Child Universe Production: a concise survey including some recent results and prospects
19 pages LaTeX, including 68 references; to appear in the Proceedings of "BH2, Dynamics and Thermodynamics of Blackholes and Naked Singularities", May 10-12 2007, Milano, Italy; conference website: http://www.mate.polimi.it/bh2
null
null
KUNS-2109
gr-qc hep-th
null
We present a review of selected topics concerning the creation and evolution of child universes, together with a concise account of some recent progress in the field.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 13:40:12 GMT" } ]
2007-12-10T00:00:00
[ [ "Ansoldi", "Stefano", "" ], [ "Guendelman", "Eduardo I.", "" ], [ "Shilon", "Idan", "" ] ]
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711.2199
Kim Nilsson
Kim K. Nilsson (Dark Cosmology Centre, DK, ESO - Garching)
The Lyman-alpha Emission Line as a Cosmological Tool
138 pages, 39 figures, 28 tables, PhD thesis defended at Copenhagen University on 21 September 2007
null
null
null
astro-ph
null
This thesis deals with different aspects of a special kind of high redshift galaxy, namely Ly-alpha emitters. Ly-alpha emitters are galaxies found through their Ly-alpha emission, at redshifts larger than z >~ 2 where the emission line has been redshifted into the optical or near-infrared regime. The thesis has two main parts; a lower redshift, observational part (z ~ 3) and a more technical/theoretical very high redshift part (z ~ 9). In the first, lower redshift part I present the analysis of a narrow-band image taken in the GOODS-S field, focused on a redshift for Ly-alpha of z = 3.15. The image, covering a central part of the GOODS-S field revealed 25 Ly-alpha emitting candidates, of which one turned out to be a so-called Ly-alpha blob. In the second part, I discuss future, very high redshift narrow-band surveys for Ly-alpha emitters. Finally, in a project unrelated to the other two parts of the thesis, I present a search for a 'Fundamental plane' of Ly-alpha emitters in the colour space produced by large-scale multi-wavelength surveys such as GOODS or COSMOS. [Abridged]
[ { "version": "v1", "created": "Tue, 13 Nov 2007 21:23:47 GMT" } ]
2007-11-15T00:00:00
[ [ "Nilsson", "Kim K.", "", "Dark Cosmology Centre, DK, ESO - Garching" ] ]
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711.22
Kunji Nakayama
Kunji Nakayama
Topos-Theoretic Extension of a Modal Interpretation of Quantum Mechanics
LaTeX2e
Int.J.Theor.Phys.47:2065-2094,2008
10.1007/s10773-008-9649-6
null
quant-ph gr-qc
null
This paper deals with topos-theoretic truth-value valuations of quantum propositions. Concretely, a mathematical framework of a specific type of modal approach is extended to the topos theory, and further, structures of the obtained truth-value valuations are investigated. What is taken up is the modal approach based on a determinate lattice $\Dcal(e,R)$, which is a sublattice of the lattice $\Lcal$ of all quantum propositions and is determined by a quantum state $e$ and a preferred determinate observable $R$. Topos-theoretic extension is made in the functor category $\Sets^{\CcalR}$ of which base category $\CcalR$ is determined by $R$. Each true atom, which determines truth values, true or false, of all propositions in $\Dcal(e,R)$, generates also a multi-valued valuation function of which domain and range are $\Lcal$ and a Heyting algebra given by the subobject classifier in $\Sets^{\CcalR}$, respectively. All true propositions in $\Dcal(e,R)$ are assigned the top element of the Heyting algebra by the valuation function. False propositions including the null proposition are, however, assigned values larger than the bottom element. This defect can be removed by use of a subobject semi-classifier. Furthermore, in order to treat all possible determinate observables in a unified framework, another valuations are constructed in the functor category $\Sets^{\Ccal}$. Here, the base category $\Ccal$ includes all $\CcalR$'s as subcategories. Although $\Sets^{\Ccal}$ has a structure apparently different from $\Sets^{\CcalR}$, a subobject semi-classifier of $\Sets^{\Ccal}$ gives valuations completely equivalent to those in $\Sets^{\CcalR}$'s.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 13:47:04 GMT" } ]
2008-11-26T00:00:00
[ [ "Nakayama", "Kunji", "" ] ]
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711.2201
Narit Pidokrajt
Jan E. Aman, Narit Pidokrajt, John Ward
On Geometro-thermodynamics of Dilaton Black Holes
Talk given at 30th Spanish Relativity Meeting (ERE 2007): Relativistic Astrophysics And Cosmology, 10-14 Sep 2007, Puerto de La Cruz, Tenerife, Spain. Typos corrected
EAS Publ.Ser.30:279,2008
10.1051/eas:0830044
USITP 07-02
hep-th gr-qc
null
In this talk we present the latest results from our ongoing project on geometro-thermodynamics (also known as information geometry of thermodynamics or Ruppeiner geometry) of dilaton BHs in 4D in both Einstein and string frames and a dyonic dilaton BH and at the end we report very briefly results from this approach to the 2D dilaton BHs.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 13:57:42 GMT" }, { "version": "v2", "created": "Sun, 18 Nov 2007 10:17:29 GMT" } ]
2009-01-14T00:00:00
[ [ "Aman", "Jan E.", "" ], [ "Pidokrajt", "Narit", "" ], [ "Ward", "John", "" ] ]
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711.2202
Hans-Christoph Grunau
Alberto Ferrero, Hans-Christoph Grunau, Paschalis Karageorgis
Supercritical biharmonic equations with power-type nonlinearity
null
Ann. Mat. Pura Appl. 188, 171 - 185 (2009).
10.1007/s10231-008-0070-9
null
math.AP math.CA
null
The biharmonic supercritical equation $\Delta^2u=|u|^{p-1}u$, where $n>4$ and $p>(n+4)/(n-4)$, is studied in the whole space $\mathbb{R}^n$ as well as in a modified form with $\lambda(1+u)^p$ as right-hand-side with an additional eigenvalue parameter $\lambda>0$ in the unit ball, in the latter case together with Dirichlet boundary conditions. As for entire regular radial solutions we prove oscillatory behaviour around the explicitly known radial {\it singular} solution, provided $p\in((n+4)/(n-4),p_c)$, where $p_c\in ((n+4)/(n-4),\infty]$ is a further critical exponent, which was introduced in a recent work by Gazzola and the second author. The third author proved already that these oscillations do not occur in the complementing case, where $p\ge p_c$. Concerning the Dirichlet problem we prove existence of at least one singular solution with corresponding eigenvalue parameter. Moreover, for the extremal solution in the bifurcation diagram for this nonlinear biharmonic eigenvalue problem, we prove smoothness as long as $p\in((n+4)/(n-4),p_c)$.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 14:05:26 GMT" } ]
2009-02-27T00:00:00
[ [ "Ferrero", "Alberto", "" ], [ "Grunau", "Hans-Christoph", "" ], [ "Karageorgis", "Paschalis", "" ] ]
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711.2203
Masafumi Seriu
Masafumi Seriu and Chun-Hsien Wu
Switching effect upon the quantum Brownian motion near a reflecting boundary
12 pages, 2 figures This version is just to correct the author-list
Physical Review A77, 022107 (2008)
10.1103/PhysRevA.77.022107
null
quant-ph gr-qc
null
The quantum Brownian motion of a charged particle in the electromagnetic vacuum fluctuations is investigated near a perfectly reflecting flat boundary, taking into account the smooth switching process in the measurement. Constructing a smooth switching function by gluing together a plateau and the Lorentzian switching tails, it is shown that the switching tails have a great influence on the measurement of the Brownian motion in the quantum vacuum. Indeed, it turns out that the result with a smooth switching function and the one with a sudden switching function are qualitatively quite different. It is also shown that anti-correlations between the switching tails and the main measuring part plays an essential role in this switching effect. The switching function can also be interpreted as a prototype of an non-equilibrium process in a realistic measurement, so that the switching effect found here is expected to be significant in actual applications in vacuum physics.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 14:06:24 GMT" }, { "version": "v2", "created": "Fri, 16 Nov 2007 01:43:46 GMT" } ]
2009-11-13T00:00:00
[ [ "Seriu", "Masafumi", "" ], [ "Wu", "Chun-Hsien", "" ] ]
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711.2204
Alexandre Kisselev
A.V. Kisselev
RS model with the small curvature and Bhabha scattering at the ILC
13 pages, 5 figures, talk at the International School-Seminar ``Actual Problems of Microworld Physics'', Gomel, Belarus, July 23 - August 3, 2007
null
null
null
hep-ph
null
The Randall-Sundrum (RS) model with the small curvature is studied. In such a scheme the mass spectrum of Kaluza-Klein (KK) gravitons is similar to that in a model with one extra flat dimension. The gravity effects in the Bhabha scattering at the energy 1 TeV are estimated. The calculations are based on the analytical formula which describes virtual graviton contributions. It takes into account both a discrete character of the mass spectrum and nonzero widths of the KK gravitons.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 14:08:04 GMT" } ]
2007-11-15T00:00:00
[ [ "Kisselev", "A. V.", "" ] ]
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711.2205
Heinrichs Jean
J. Heinrichs
Enhancement of Persistent Current in Metal Rings by Correlated Disorder
18
J.Phys.:Condens.Matter 20 (2008) 345232 (9pp)
10.1088/0953-8984/20/34/345232
null
cond-mat.mes-hall cond-mat.dis-nn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study analytically the effect of a correlated random potential on the persistent current in a one-dimensional ring threaded by a magnetic flux $\phi$, using an Anderson tight-binding model. In our model, the system of $N=2M$ atomic sites of the ring is assumed to be partitioned into $M$ pairs of identical nearest-neighbour sites (dimers). The site energies for different dimers are taken to be uncorrelated gaussian variables. For this system we obtain the exact flux-dependent energy levels to second order in the random site energies, using an earlier exact transfer matrix perturbation theory. These results are used to study the mean persistent current generated by $N_e\leq N$ spinless electrons occupying the $N_e$ lowest levels of the flux-dependent energy band at zero temperature. Detailed analyses are carried out in the limit $1\ll N_e\ll N$ and for a half-filled band ($N_e=N/2$), for magnetic fluxes $-1/2 <\phi/\phi_0<1/2$. While the uncorrelated disorder leads to a reduction of the persistent current, the disorder correlation acts to enhance it. In particular, in the half-filled band case the correlated disorder leads to a global flux-dependent enhancement of persistent current which has the same form for even and odd $N_e$. At low filling of the energy band the effect of the disorder on the persistent current is found to depend on the parity of $N_e$: the correlated disorder yields a reduction of the current for odd $N_e$ and an enhancement of the current for even $N_e$.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 14:10:12 GMT" }, { "version": "v2", "created": "Mon, 11 Feb 2008 15:17:52 GMT" }, { "version": "v3", "created": "Fri, 22 Aug 2008 13:35:10 GMT" } ]
2009-11-13T00:00:00
[ [ "Heinrichs", "J.", "" ] ]
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711.2206
Charles Young
C. A. S. Young, R. Zegers
Covariant particle statistics and intertwiners of the kappa-deformed Poincare algebra
16 pages, latex; v2, references added
Nucl.Phys.B797:537-549,2008
10.1016/j.nuclphysb.2007.12.021
DCPT-07/59
hep-th
null
To speak about identical particles - bosons or fermions - in quantum field theories with kappa-deformed Poincare symmetry, one must have a kappa-covariant notion of particle exchange. This means constructing intertwiners of the relevant representations of kappa-Poincare. We show, in the simple case of spinless particles, that intertwiners exist, and, supported by a perturbative calculation to third order in 1/kappa, make a conjecture about the existence and uniqueness of a certain preferred intertwiner defining particle exchange in kappa-deformed theories.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 14:10:21 GMT" }, { "version": "v2", "created": "Wed, 28 Nov 2007 10:53:18 GMT" } ]
2008-11-26T00:00:00
[ [ "Young", "C. A. S.", "" ], [ "Zegers", "R.", "" ] ]
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711.2207
Francesco Petruccione
Alessandro Sergi and Francesco Petruccione
Nos\'e-Hoover Dynamics in Quantum Phase Space
4 pages, no figures
null
10.1088/1751-8113/41/35/355304
null
quant-ph
null
Thermal fluctuations in time-dependent quantum processes are treated by a constant-temperature generalization of Wigner's formulation of quantum mechanics in phase space. To this end, quantum Nos\`e-Hoover dynamics is defined by generalizing the Moyal bracket. Computational applications of the formalism, together with further theoretical developments, are discussed.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 14:15:16 GMT" } ]
2009-11-13T00:00:00
[ [ "Sergi", "Alessandro", "" ], [ "Petruccione", "Francesco", "" ] ]
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