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712.0679
Jean-Marc Bardet
Jean-Marc Bardet (CES, Matisse, Samos), Olivier Wintenberger (CES, Matisse, Samos)
Asymptotic normality of the Quasi Maximum Likelihood Estimator for multidimensional causal processes
null
The Annals of Statistics (2009) 1-32
null
null
math.ST stat.TH
null
Strong consistency and asymptotic normality of the Quasi-Maximum Likelihood Estimator (QMLE) are given for a general class of multidimensional causal processes. For particular cases already studied in the literature (for instance univariate or multivariate GARCH, ARCH, ARMA-GARCH processes) the assumptions required for establishing these results are often weaker than existing conditions. The QMLE asymptotic behavior is also given for numerous new examples of univariate or multivariate processes (for instance TARCH or NLARCH processes).
[ { "version": "v1", "created": "Wed, 5 Dec 2007 10:21:16 GMT" } ]
2009-01-09T00:00:00
[ [ "Bardet", "Jean-Marc", "", "CES, Matisse, Samos" ], [ "Wintenberger", "Olivier", "", "CES,\n Matisse, Samos" ] ]
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712.068
Claudio Grillo
C. Grillo, R. Gobat, P. Rosati, and M. Lombardi
Stellar mass estimates in early-type galaxies from lensing+dynamical and photometric measurements
4 pages, 2 figures, accepted by Astronomy & Astrophysics
null
10.1051/0004-6361:20078934
null
astro-ph
null
In this paper we compare two different diagnostics for estimating stellar masses in early-type galaxies and we establish their level of reliability. In particular, we consider the well-studied sample of 15 field elliptical galaxies selected from the Sloan Lens ACS (SLACS) Survey (z = 0.06-0.33). We examine here the correlation between the stellar mass values, enclosed inside the Einstein radius of each lens, based on analyses of lensing and stellar dynamics combined and based on multiwavelength photometry spectral template fitting. The lensing+dynamics stellar mass is obtained from the published SLACS Survey results, assuming a two-component density distribution model and a prior from the fundamental plane on the mass-to-light ratio for the lens galaxies. The photometric stellar mass is measured by fitting the observed spectral energy distribution of the galaxies (from the SDSS multi-band photometry over 354-913 nm) with composite stellar population templates, under the assumption that light traces stellar mass. The two methods are completely independent. They rely on several different assumptions, and so, in principle, both can have significant biases. Based on our sample of massive galaxies, we find consistency between the lensing+dynamics and the photometric mass estimates. We obtain a Pearson linear correlation coefficient of 0.94 and a median value of the ratio between the former and the latter mass measurements of 1.1+/-0.1. This suggests that both methods can separately yield reliable stellar masses of early-type galaxies, and confirms that photometric mass estimates are accurate, as long as optical/near-IR rest frame photometry is available.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 10:34:19 GMT" } ]
2009-11-13T00:00:00
[ [ "Grillo", "C.", "" ], [ "Gobat", "R.", "" ], [ "Rosati", "P.", "" ], [ "Lombardi", "M.", "" ] ]
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712.0681
Luca Guido Molinari
Luca G. Molinari
Determinants of Block Tridiagonal Matrices
8 pages, final form. To appear on Linear Algebra and its Applications
Linear Algebra and its Applications 429 (2008) 2221-2226
10.1016/j.laa.2008.06.015
null
math-ph math.MP math.NA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
An identity is proven that evaluates the determinant of a block tridiagonal matrix with (or without) corners as the determinant of the associated transfer matrix (or a submatrix of it).
[ { "version": "v1", "created": "Wed, 5 Dec 2007 10:23:40 GMT" }, { "version": "v2", "created": "Wed, 9 Jan 2008 15:33:13 GMT" }, { "version": "v3", "created": "Mon, 16 Jun 2008 07:23:31 GMT" } ]
2008-09-03T00:00:00
[ [ "Molinari", "Luca G.", "" ] ]
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712.0682
Daniel Buchholz
D. Buchholz, P. Drouvelis and P. Schmelcher
Tunable transmission via quantum state evolution in oval quantum dots
5 pages, 3 figures, accepted for publication in EPL
null
10.1209/0295-5075/81/37001
null
cond-mat.mes-hall
null
We explore the quantum transmission through open oval shaped quantum dots. The transmission spectra show periodic resonances and, depending on the geometry parameter, a strong suppression of the transmission for low energies. Applying a weak perpendicular magnetic field changes this situation drastically and introduces a large conductance. We identify the underlying mechanisms being partially due to the specific shape of the oval that causes a systematic decoupling of a substantial number of states from the leads. Importantly a pairwise destructive interference of the transmitting states is encountered thereby leading to the complete conductance suppression. Coupling properties and interferences can be tuned via a weak magnetic field. These properties are robust with respect to the presence of disorder in the quantum dot.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 10:35:45 GMT" } ]
2009-11-13T00:00:00
[ [ "Buchholz", "D.", "" ], [ "Drouvelis", "P.", "" ], [ "Schmelcher", "P.", "" ] ]
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712.0683
Ghanashyam Date
Kinjal Banerjee and Ghanashyam Date
Loop Quantization of Polarized Gowdy Model on $T^3$: Classical Theory
20 pages, no figures. Final version; to appear in Classical and Quantum Gravity. Additional References included
Class.Quant.Grav.25:105014,2008
10.1088/0264-9381/25/10/105014
IMSc/2007/12/15
gr-qc hep-th
null
The vacuum Gowdy models provide much studied, non-trivial midi-superspace examples. Various technical issues within Loop Quantum Gravity can be studied in these models as well as one can hope to understand singularities and their resolution in the loop quantization. The first step in this program is to reformulate the model in real connection variables in a manner that is amenable to loop quantization. We begin with the unpolarized model and carry out a consistent reduction to the polarized case. Carrying out complete gauge fixing, the known solutions are recovered.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 10:53:38 GMT" }, { "version": "v2", "created": "Thu, 17 Apr 2008 12:31:03 GMT" } ]
2008-11-26T00:00:00
[ [ "Banerjee", "Kinjal", "" ], [ "Date", "Ghanashyam", "" ] ]
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712.0684
Anton Baranov
Anton D. Baranov
Compact embeddings of model subspaces of the Hardy space
26 pages
Izvestia Mathematics, 73 (2009), 6, 1077-1100 (revised version)
10.1070/IM2009v073n06ABEH002473
null
math.CV math.FA
null
We study embeddings of model (star-invariant) subspaces $K^p_{\Theta}$ of the Hardy space $H^p$, associated with an inner function $\Theta$. We obtain a criterion for the compactness of the embedding of $K^p_{\Theta}$ into $L^p(\mu)$ analogous to the Volberg--Treil theorem on bounded embeddings and answer a question posed by Cima and Matheson. The proof is based on Bernstein inequalities for functions in $K^p_{\Theta}$. Also we study measures $\mu$ such that the embedding operator belongs to a Schatten--von Neumann ideal.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 10:41:53 GMT" } ]
2015-05-13T00:00:00
[ [ "Baranov", "Anton D.", "" ] ]
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712.0685
Felix Finster
Felix Finster
From Discrete Space-Time to Minkowski Space: Basic Mechanisms, Methods and Perspectives
25 pages, LaTeX, 6 figures, minor improvements (published version)
"Quantum Field Theory," B. Fauser et al. (eds.), Birkh\"auser (2009) 235-259
10.1007/978-3-7643-8736-5_14
null
math-ph math.MP
null
This survey article reviews recent results on fermion system in discrete space-time and corresponding systems in Minkowski space. After a basic introduction to the discrete setting, we explain a mechanism of spontaneous symmetry breaking which leads to the emergence of a discrete causal structure. As methods to study the transition between discrete space-time and Minkowski space, we describe a lattice model for a static and isotropic space-time, outline the analysis of regularization tails of vacuum Dirac sea configurations, and introduce a Lorentz invariant action for the masses of the Dirac seas. We mention the method of the continuum limit, which allows to analyze interacting systems. Open problems are discussed.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 10:46:01 GMT" }, { "version": "v2", "created": "Fri, 22 Feb 2008 14:28:37 GMT" } ]
2015-05-13T00:00:00
[ [ "Finster", "Felix", "" ] ]
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712.0686
Koji Nagata
Koji Nagata and Jaewook Ahn
Violation of Rotational Invariance of Local Realistic Models with Two Settings
4 pages
J. Korean Phys. Soc. 53, 2216 (2008)
10.3938/jkps.53.2216
null
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We have considered a two-particle Bell experiment to visualize the conflict between rotational invariance of physical laws and a specific local realistic theory. The experiment is reproducible by using a local realistic theory obtained in a two-setting Bell experiment. The generalized Bell inequality {[J. Phys. A: Math. Theor. {\bf 40}, 13101 (2007)]}, which is derived under the assumption that there exists a rotationally invariant local realistic theory, turns out to disprove such a local realistic model existing with a two-setting experiment. This implies that such a model is not rotationally invariant and should, therefore, be ruled out in some situations.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 10:46:52 GMT" }, { "version": "v2", "created": "Mon, 14 Jan 2008 05:37:12 GMT" }, { "version": "v3", "created": "Wed, 13 Aug 2008 07:11:35 GMT" }, { "version": "v4", "created": "Sat, 22 Nov 2008 08:14:54 GMT" } ]
2018-02-14T00:00:00
[ [ "Nagata", "Koji", "" ], [ "Ahn", "Jaewook", "" ] ]
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712.0687
Ghanashyam Date
Kinjal Banerjee and Ghanashyam Date
Loop Quantization of Polarized Gowdy Model on $T^3$: Kinematical States and Constraint Operators
26 pages, no figures. Version 2 accepted for publication. This has the sub-title changed, introduction modified for comments on references, small errors corrected and references updated
Class.Quant.Grav.25:145004,2008
10.1088/0264-9381/25/14/145004
IMSc/2007/12/16
gr-qc hep-th
null
In this second paper on loop quantization of Gowdy model, we introduce the kinematical Hilbert space on which appropriate holonomies and fluxes are well represented. The quantization of the volume operator and the Gauss constraint is straightforward. Imposition of the Gauss constraint can be done on the kinematical Hilbert space to select subspace of gauge invariant states. We carry out the quantization of the Hamiltonian constraint making specific choices. Alternative choices are briefly discussed. It appears that to get spatial correlations reflected in the Hamiltonian constraint, one may have to adopt the so called `effective operator viewpoint'.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 10:47:23 GMT" }, { "version": "v2", "created": "Mon, 2 Jun 2008 09:43:07 GMT" } ]
2008-11-26T00:00:00
[ [ "Banerjee", "Kinjal", "" ], [ "Date", "Ghanashyam", "" ] ]
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712.0688
Parthanil Roy
Parthanil Roy
Ergodic Theory, Abelian Groups, and Point Processes Induced by Stable Random Fields
To appear in the Annals of Probability. Some typos are fixed and Remark 4.3 (due to Jan Rosinski) is added in the second version
null
null
null
math.PR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider a point process sequence induced by a stationary symmetric alpha-stable (0 < alpha < 2) discrete parameter random field. It is easy to prove, following the arguments in the one-dimensional case in Resnick and Samorodnitsky (2004), that if the random field is generated by a dissipative group action then the point process sequence converges weakly to a cluster Poisson process. For the conservative case, no general result is known even in the one-dimensional case. We look at a specific class of stable random fields generated by conservative actions whose effective dimensions can be computed using the structure theorem of finitely generated abelian groups. The corresponding point processes sequence is not tight and hence needs to be properly normalized in order to ensure weak convergence. This weak limit is computed using extreme value theory and some counting techniques.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 10:48:45 GMT" }, { "version": "v2", "created": "Thu, 2 Jul 2009 00:03:59 GMT" } ]
2009-07-02T00:00:00
[ [ "Roy", "Parthanil", "" ] ]
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712.0689
Horatiu Stefan Nastase
Horatiu Nastase
Introduction to AdS-CFT
133 pages, 13 figures; typos corrected, references added
null
null
null
hep-th
null
These lectures present an introduction to AdS-CFT, and are intended both for begining and more advanced graduate students, which are familiar with quantum field theory and have a working knowledge of their basic methods. Familiarity with supersymmetry, general relativity and string theory is helpful, but not necessary, as the course intends to be as self-contained as possible. I will introduce the needed elements of field and gauge theory, general relativity, supersymmetry, supergravity, strings and conformal field theory. Then I describe the basic AdS-CFT scenario, of ${\cal N}=4 $ Super Yang-Mills's relation to string theory in $AdS_5\times S_5$, and applications that can be derived from it: 3-point functions, quark-antiquark potential, finite temperature and scattering processes, the pp wave correspondence and spin chains. I also describe some general properties of gravity duals of gauge theories.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 10:51:01 GMT" }, { "version": "v2", "created": "Thu, 20 Dec 2007 04:42:24 GMT" } ]
2007-12-20T00:00:00
[ [ "Nastase", "Horatiu", "" ] ]
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712.069
Mathieu Servillat
M. Servillat, N. A. Webb, D. Barret
XMM-Newton observations of the Galactic globular clusters NGC 2808 and NGC 4372
11 pages, 3 pages of online material, 10 figures and 9 tables. Accepted for publication in A&A
null
10.1051/0004-6361:20078327
null
astro-ph
null
Galactic globular clusters harbour binary systems that are detected as faint X-ray sources. These close binaries are thought to play an important role in the stability of the clusters by liberating energy and delaying the inevitable core collapse of globular clusters. The inventory of close binaries and their identification is therefore essential. We present XMM-Newton observations of two Galactic globular clusters: NGC 2808 and NGC 4372. We use X-ray spectral and variability analysis combined with ultra-violet observations made with the XMM-Newton optical monitor and published data from the Hubble Space Telescope to identify sources associated with the clusters. We compare the results of our observations with estimates from population synthesis models. Five sources out of 96 are likely to be related to NGC 2808. Nine sources are found in the field of view of NGC 4372, none being located inside its half-mass radius. We find one quiescent neutron star low mass X-ray binary candidate in the core of NGC 2808, and propose that the majority of the central sources in NGC 2808 are cataclysmic variables. An estimation leads to ~20+/-10 cataclysmic variables with luminosity above 4.25 x 10^31 erg s^-1. Millisecond pulsars could also be present in the core of NGC 2808, and some sources outside of the half-mass radius could possibly be linked to the cluster.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 10:53:55 GMT" }, { "version": "v2", "created": "Mon, 7 Jan 2008 13:31:37 GMT" } ]
2009-11-13T00:00:00
[ [ "Servillat", "M.", "" ], [ "Webb", "N. A.", "" ], [ "Barret", "D.", "" ] ]
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712.0691
Marcelo Buffoni
Marcelo Buffoni (INRIA Futurs), Haysam Telib (DIASP), Angelo Iollo (INRIA Futurs)
Iterative Methods for Model Reduction by Domain Decomposition
null
null
null
null
physics.class-ph
null
We propose a method to reduce the computational effort to solve a partial differential equation on a given domain. The main idea is to split the domain of interest in two subdomains, and to use different approximation methods in each of the two subdomains. In particular, in one subdomain we discretize the governing equations by a canonical scheme, whereas in the other one we solve a reduced order model of the original problem. Different approaches to couple the low-order model to the usual discretization are presented. The effectiveness of these approaches is tested on numerical examples pertinent to non-linear model problems including the Laplace equation with non-linear boundary conditions and the compressible Euler equations.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 14:04:46 GMT" } ]
2007-12-06T00:00:00
[ [ "Buffoni", "Marcelo", "", "INRIA Futurs" ], [ "Telib", "Haysam", "", "DIASP" ], [ "Iollo", "Angelo", "", "INRIA Futurs" ] ]
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712.0692
Jochen Heinloth
Jochen Heinloth
Bounds for Behrend's conjecture on the canonical reduction
Erroneous claim about orthogonal bundles in characteristic 2 removed
null
null
null
math.AG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We prove Behrend's conjecture on the rationality of the canonical reduction of principal bundles and reductive group schemes for classical groups and give new bounds for the conjecture for exceptional groups. However we find a counterexample in the case of G_2-bundles in characteristic 2.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 11:09:30 GMT" }, { "version": "v2", "created": "Mon, 3 Nov 2008 21:41:22 GMT" } ]
2008-11-03T00:00:00
[ [ "Heinloth", "Jochen", "" ] ]
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712.0693
Chengqing Li
Chengqing Li, Dan Zhang, and Guanrong Chen
Cryptanalysis of an image encryption scheme based on the Hill cipher
10 pages, three figures
null
10.1631/jzus.A0720102
null
cs.CR
null
This paper studies the security of an image encryption scheme based on the Hill cipher and reports its following problems: 1) there is a simple necessary and sufficient condition that makes a number of secret keys invalid; 2) it is insensitive to the change of the secret key; 3) it is insensitive to the change of the plain-image; 4) it can be broken with only one known/chosen-plaintext; 5) it has some other minor defects.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 11:11:16 GMT" } ]
2009-12-21T00:00:00
[ [ "Li", "Chengqing", "" ], [ "Zhang", "Dan", "" ], [ "Chen", "Guanrong", "" ] ]
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712.0694
Yijun He
Yijun He, Haizhong Li, Hui Ma, Jianquan Ge
Compact embedded hypersurfaces with constant higher order anisotropic mean curvatures
15 pages
null
null
null
math.DG
null
Given a positive function $F$ on $S^n$ which satisfies a convexity condition, for $1\leq r\leq n$, we define the $r$-th anisotropic mean curvature function $H^F_r$ for hypersurfaces in $\mathbb{R}^{n+1}$ which is a generalization of the usual $r$-th mean curvature function. We prove that a compact embedded hypersurface without boundary in $\R^{n+1}$ with $H^F_r={constant}$ is the Wulff shape, up to translations and homotheties. In case $r=1$, our result is the anisotropic version of Alexandrov Theorem, which gives an affirmative answer to an open problem of F. Morgan.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 11:21:40 GMT" }, { "version": "v2", "created": "Wed, 19 Dec 2007 10:33:49 GMT" } ]
2007-12-19T00:00:00
[ [ "He", "Yijun", "" ], [ "Li", "Haizhong", "" ], [ "Ma", "Hui", "" ], [ "Ge", "Jianquan", "" ] ]
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712.0695
S\'andor Borb\'ely
S. Borb\'ely, K. T\H{o}k\'esi, L. Nagy
Ionization of the hydrogen atom by intense ultrashort laser pulses
submited to PRA
null
10.1103/PhysRevA.77.033412
null
physics.atom-ph physics.comp-ph
null
The ionization of atomic hydrogen in intense laser fields is studied theoretically. The calculations were performed applying both quantummechanical and classical approaches. Treating the problem quantummechanically, the time dependent Schr\"odinger equation (TDSE) of our system was first transformed into a pseudo-momentum space and solved in this space iteratively. While neglecting the Coulomb potential during the solution of the TDSE we got the results in the Volkov approximation, in the first order solution we taken into account the Coulomb potential as perturbation. The classical calculations were performed within the framework of the classical trajectory Monte-Carlo (CTMC) method. The double differential ionization probabilities are calculated for different laser pulses and a reasonable agreement was found between the theories. Major differences can be observed in the angular distribution of electrons at low electron energies between classical and the quantummechanical approaches. At high electron energies the differences disappear, which indicates that the generation of low energy electrons is of quantum type, and it is strongly influenced by the Coulomb potential, while the production of high energy electrons is of classical type and it is less influenced by the Coulomb interaction. Our results are also compared with the Coulomb-Volkov (CV) model calculations.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 11:31:37 GMT" } ]
2009-11-13T00:00:00
[ [ "Borbély", "S.", "" ], [ "Tőkési", "K.", "" ], [ "Nagy", "L.", "" ] ]
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712.0696
Alexander Schegerer
A. A. Schegerer, S. Wolf, Th. Ratzka, and Ch. Leinert
The T Tauri star RY Tau as a case study of the inner regions of circumstellar dust disks
19 pages, 23 figures; accepted by Astronomy & Astrophysics
null
10.1051/0004-6361:20077049
null
astro-ph
null
We study the inner region of the circumstellar disk around the TTauri star RY Tau. Our aim is to find a physical description satisfying the available interferometric data, obtained with the mid-infrared interferometric instrument at the Very Large Telescope Interferometer, as well as the spectral energy distribution. We also compare the findings with the results of similar studies, including those of intermediate-mass stars. Our analysis is done within the framework of a passive circumstellar disk, which is optionally supplemented by the effects of accretion and an added envelope. To achieve a more consistent and realistic model, we used our continuum transfer code MC3D. In addition, we studied the shape of the 10um silicate emission feature in terms of the underlying dust population, both for single-dish and for interferometric measurements. We show that a modestly flaring disk model with accretion can explain both the observed spectral energy distribution and the mid-infrared visibilities obtained with the mid-infrared infrared instrument. We found an interesting ambiguity: a circumstellar active disk model with an added envelope, and a lower accretion rate than in the active disk model without envelope, could represent the observations equally as well. This type of model with the envelope should be considered a viable alternative in future models of other TTauri stars. The approach of a disk with a puffed-up inner rim wall and the influence of a stellar companion is also discussed. From the study of the silicate emission feature we see evidence for dust evolution in a TTauri star, with a decreasing fraction of small amorphous and an increasing fraction of crystalline particles closer to the star.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 11:48:07 GMT" } ]
2009-11-13T00:00:00
[ [ "Schegerer", "A. A.", "" ], [ "Wolf", "S.", "" ], [ "Ratzka", "Th.", "" ], [ "Leinert", "Ch.", "" ] ]
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712.0697
Ambar Ghosal
Debasish Majumdar and Ambar Ghosal
Investigating Possible Neutrino Decay in Long Baseline Experiment Using ICAL as Far end Detector
7 pages LaTeX, 4 pdf figures
null
null
null
hep-ph
null
We investigate the effects of possible decay of neutrinos from a neutrino factory in a long baseline experiment. We consider the neutrinos from a factory at CERN and the detector to be the 50 kTon iron calorimeter (ICAL) detector proposed for India-based Neutrino Observatory (INO). We found considerable depletion of muon yield at INO for certain value of decay parameters.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 11:49:34 GMT" }, { "version": "v2", "created": "Thu, 6 Dec 2007 06:52:50 GMT" } ]
2007-12-06T00:00:00
[ [ "Majumdar", "Debasish", "" ], [ "Ghosal", "Ambar", "" ] ]
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712.0698
Carolina Romero-Redondo
C. Romero-Redondo, E. Garrido, D.V. Fedorov, A.S. Jensen
Isomeric 0- halo-states in 12Be and 11Li
to be published in Physics Letters B
Phys.Lett.B660:32-36,2008
10.1016/j.physletb.2007.12.014
null
nucl-th
null
We predict the existence of an isomeric 0$^-$-state in $^{12}$Be at an excitation energy of about 2.5 MeV, and a 0$^-$-resonance in $^{11}$Li with both energy and width of about 1 MeV corresponding to two-neutron emission. The structure of these halo-like states are like the 1$^-$-states which means essentially a core surrounded by two neutrons in single-particle $s$ and p-states. The life-time of the $^{12}$Be state is determined by $M1$ or $M2$-emission, $\tau(M1) \approx 10^{-11}$ s or $\tau(M2) \approx 10^{-8}$ s estimated for photon energies of 0.1 MeV and 0.6 MeV, respectively.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 11:58:10 GMT" } ]
2008-11-26T00:00:00
[ [ "Romero-Redondo", "C.", "" ], [ "Garrido", "E.", "" ], [ "Fedorov", "D. V.", "" ], [ "Jensen", "A. S.", "" ] ]
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712.0699
Vlad Avrigeanu
M. Avrigeanu (1), S. V. Chuvaev (2), A. A. Filatenkov (2), R. A. Forrest (3), M. Herman (4), A.J. Koning (5), A. J. M. Plompen (6), F. L. Roman (1), V. Avrigeanu (1) ((1) "Horia Hulubei" National Institute for Physics and Nuclear Engineering, Bucharest, (2) V.G. Khlopin Radium Institute, St. Petersburg, (3) EURATOM-UKAEA Fusion Association, Culham Science Centre, Culham, (4) Brookhaven National Laboratory, Upton, (5) Nuclear Research and Consultancy Group NRG, Petten, (6) European Commission, Joint Research Center, Institute for Reference Materials and Measurements, Geel)
Fast-neutron induced pre-equilibrium reactions on 55Mn and 63,65Cu at energies up to 40 MeV
39 pages, 12 figures
Nucl.Phys.A806:15-39,2008
10.1016/j.nuclphysa.2008.03.010
null
nucl-ex
null
Excitation functions were measured for the $^{55}$Mn(n,2n)$^{54}$Mn, $^{55}$Mn(n,$\alpha$)$^{52}$V, $^{63}$Cu(n,$\alpha$)$^{60}$Co, $^{65}$Cu(n,2n)$^{64}$Cu, and $^{65}$Cu(n,p)$^{65}$Ni reactions from 13.47 to 14.83 MeV. The experimental cross sections are compared with the results of calculations including all activation channels for the stable isotopes of Mn and Cu, for neutron incident energies up to 50 MeV. Within the energy range up to 20 MeV the model calculations are most sensitive to the parameters related to nuclei in the early stages of the reaction, while the model assumptions are better established by analysis of the data in the energy range 20-40 MeV. While the present analysis has taken advantage of both a new set of accurate measured cross sections around 14 MeV and the larger data basis fortunately available between 20 and 40 MeV for the Mn and Cu isotopes, the need of additional measurements below as well as above 40 MeV is pointed out. Keywords: 55Mn, 63,65Cu, E$\leq$40 MeV, Neutron activation cross section measurements, Nuclear reactions, Model calculations, Manganese, Copper
[ { "version": "v1", "created": "Wed, 5 Dec 2007 12:02:26 GMT" } ]
2008-11-26T00:00:00
[ [ "Avrigeanu", "M.", "" ], [ "Chuvaev", "S. V.", "" ], [ "Filatenkov", "A. A.", "" ], [ "Forrest", "R. A.", "" ], [ "Herman", "M.", "" ], [ "Koning", "A. J.", "" ], [ "Plompen", "A. J. M.", "" ], [ "Roman", "F. L.", "" ], [ "Avrigeanu", "V.", "" ] ]
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712.07
Yuta Kodama
Yuta Kodama, Kento Kokubu, and Nobuyuki Sawado
Localizing gravity on Maxwell gauged CP1 model in six dimensions
23 pages, 7 figures; references added
Phys.Rev.D78:045001,2008
10.1103/PhysRevD.78.045001
null
hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We shall consider about a 3-brane embedded in six-dimensional space-time with a negative bulk cosmological constant. The 3-brane is constructed by a topological soliton solution living in two-dimensional axially symmetric transverse subspace. Similar to most previous works of six-dimensional soliton models, our Maxwell gauged CP1 brane model can also achieve to localize gravity around the 3-brane. The CP1 field is described by a scalar doublet and derived from O(3) sigma model by projecting it onto two-dimensional complex space. In that sense, our framework is more effective than other solitonic brane models concerning with gauge theory. We shall also discuss about linear stability analysis for our new model by fluctuating all fields.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 12:09:48 GMT" }, { "version": "v2", "created": "Wed, 16 Jul 2008 11:10:16 GMT" } ]
2008-11-26T00:00:00
[ [ "Kodama", "Yuta", "" ], [ "Kokubu", "Kento", "" ], [ "Sawado", "Nobuyuki", "" ] ]
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712.0701
Marcella Di Criscienzo Miss
M. Di Criscienzo, M. Marconi, F. Caputo, S. Cassisi
Pulsational models of BL Her stars
3 pages, 2 greyscale figures. Proceedings of the workshop "XXI Century challenges for stellar evolution", held in Cefalu' (Sicily, Italy), August 29 - September 2, 2007; S. Cassisi and M. Salaris Eds. To be published in Mem. SAIt Vol. 79 No. 2
null
null
null
astro-ph
null
We present an updated and homogeneous pulsational scenario for a wide range of stellar parameters typical of BL Her stars i.e., Population II Cepheids with periods shorter than 8 days.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 12:26:13 GMT" } ]
2007-12-06T00:00:00
[ [ "Di Criscienzo", "M.", "" ], [ "Marconi", "M.", "" ], [ "Caputo", "F.", "" ], [ "Cassisi", "S.", "" ] ]
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712.0702
Jeffrey Giansiracusa
Johannes Ebert, Jeffrey Giansiracusa
Pontrjagin-Thom maps and the homology of the moduli stack of stable curves
30 pages, 3 figures - v2: expanded material on homotopy types of stacks, extended Pontrjagin-Thom construction to all local quotient stacks, added references
null
null
null
math.AT math.AG
null
We study the singular homology (with field coefficients) of the moduli stack of stable n-pointed complex curves of genus g (the Deligne-Mumford compactification). Each of its irreducible boundary components determines via the Pontrjagin-Thom construction a map to a certain infinite loop space whose homology is well understood. We show that these maps are surjective on homology in a range of degrees proportional to the genus. This implies the existence of many new torsion classes in the homology of the moduli stack.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 12:18:56 GMT" }, { "version": "v2", "created": "Wed, 23 Apr 2008 11:57:58 GMT" } ]
2008-04-23T00:00:00
[ [ "Ebert", "Johannes", "" ], [ "Giansiracusa", "Jeffrey", "" ] ]
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712.0703
Ol'ga Galazutdinova A.
E.N. Tikhonov, O.A. Galazutdinova
Stellar population of the interacting galaxies M51
12 pages,9 figures, The International Conference "Cosmic Physics", Special Astrophysical Observatory of the Russian Academy of Science, Nizhnij Arkhyz, Karachaevo-Cherkesia, Russia, May 27-31, 2007
null
null
null
astro-ph
null
Stellar photometry of about one million stars in the system of the interacting galaxies M51 (NGC5194/NGC5195) has been carried out on the basis of the ACS/WFC images of the Hubble Space telescope. The distance to the system has been determined by TRGB method and metallicity of red supergiants along the NGC5194 radius has been measured. A comparison of the spacial distribution of stars in the main galaxy NGC5194 with our empirical model of spiral galaxies showed their similarity, in spite of interaction in system M51. It has been discovered that the "feathers", arising as a result of the interaction of galaxies, mainly consist of stars of intermediate age.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 12:26:24 GMT" } ]
2007-12-06T00:00:00
[ [ "Tikhonov", "E. N.", "" ], [ "Galazutdinova", "O. A.", "" ] ]
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712.0704
Xavier Artru
X. Artru (IPNL), K. Benhizia
The High-Z hydrogen-like atom: a model for polarized structure functions
null
Prob.AtomicSci.Technol.3:98-103,2007
null
null
nucl-th
null
The Dirac equation offers a precise analytical description of relativistic two-particle bound states, when one of the constituent is very heavy and radiative corrections are neglected. Looking at the high-Z hydrogen-like atom in the infinite momentum frame and treating the electron as a "parton", various properties usually attributed to the quark distributions in the nucleon are tested, in particular: Bj{\o}rken scaling; charge, helicity, transversity and momentum sum rules; existence of the parton sea; Soffer inequality; correlation between spin and transverse momentum (Sivers and Boer-Mulders effects); transverse displacement of the center-of-charge and its connection with the magnetic moment. Deep inelastic experiments with photon or positron beams at MeV energies, analogous to DIS or Drell-Yan reactions, are considered.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 12:36:48 GMT" } ]
2008-11-26T00:00:00
[ [ "Artru", "X.", "", "IPNL" ], [ "Benhizia", "K.", "" ] ]
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712.0705
German Sierra
German Sierra
A quantum mechanical model of the Riemann zeros
42 pages, 12 figures
NewJ.Phys.10:033016,2008
10.1088/1367-2630/10/3/033016
null
math-ph cond-mat.other hep-th math.MP math.NT quant-ph
null
In 1999 Berry and Keating showed that a regularization of the 1D classical Hamiltonian H = xp gives semiclassically the smooth counting function of the Riemann zeros. In this paper we first generalize this result by considering a phase space delimited by two boundary functions in position and momenta, which induce a fluctuation term in the counting of energy levels. We next quantize the xp Hamiltonian, adding an interaction term that depends on two wave functions associated to the classical boundaries in phase space. The general model is solved exactly, obtaining a continuum spectrum with discrete bound states embbeded in it. We find the boundary wave functions, associated to the Berry-Keating regularization, for which the average Riemann zeros become resonances. A spectral realization of the Riemann zeros is achieved exploiting the symmetry of the model under the exchange of position and momenta which is related to the duality symmetry of the zeta function. The boundary wave functions, giving rise to the Riemann zeros, are found using the Riemann-Siegel formula of the zeta function. Other Dirichlet L-functions are shown to find a natural realization in the model.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 12:38:21 GMT" } ]
2008-11-26T00:00:00
[ [ "Sierra", "German", "" ] ]
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712.0706
Armin Rainer
Armin Rainer
Orbit projections of proper Lie groupoids as fibrations
LaTeX, 3 pages
Czechoslovak Math. J. 59 (2009), No. 3, 591--594.
null
null
math.DG math.AT
null
Let $\mathcal{G} \rightrightarrows M$ be a source locally trivial proper Lie groupoid such that each orbit is of finite type. The orbit projection $M \to M/\mathcal{G}$ is a fibration if and only if $\mathcal{G} \rightrightarrows M$ is regular.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 12:50:04 GMT" } ]
2010-03-30T00:00:00
[ [ "Rainer", "Armin", "" ] ]
[ -0.1083401069, 0.0470852032, 0.0504069515, 0.045180425, 0.0311268736, -0.0019672068, -0.0464115627, -0.0294311568, -0.0706626475, 0.0695011988, -0.0323347822, -0.1104771718, -0.0764234439, -0.0018176701, 0.0213242322, 0.0220443308, 0.0120906997, -0.0687114149, 0.0197678879, 0.0768880248, 0.0846929699, -0.0800471678, 0.0714524388, -0.0010191728, -0.011155732, 0.0010431277, 0.0121487724, 0.0685720369, 0.0723815933, 0.0948672816, 0.0881308615, -0.0330548808, 0.0709878579, -0.0476659276, -0.1579572707, 0.0946814492, 0.0582119003, 0.1376086622, -0.0467135385, -0.0057811202, -0.0271314848, 0.0586764812, -0.0076423446, -0.029036263, 0.1337991059, 0.047015518, 0.0142045394, 0.0342860185, -0.0015505365, 0.0224856827, -0.076980941, 0.0124042919, 0.1619526595, -0.0089896265, -0.1020218134, 0.0152498456, -0.0095297014, -0.0188154988, -0.0282464772, -0.0904537663, 0.125064984, 0.0103601385, 0.1326841116, -0.0412547216, -0.0206622053, 0.1327770203, -0.1964245141, -0.0092044957, 0.0709413961, 0.1059242859, -0.0660168454, -0.0014982711, -0.0080198161, 0.0474336408, 0.0236355178, 0.0396519192, 0.0093961349, 0.0490132123, 0.0096400389, -0.0069687031, 0.0202208534, 0.0121836159, 0.1270162314, -0.0229734909, 0.0515219457, -0.0722422227, -0.0124855926, -0.0321954079, -0.0794896707, 0.025807431, 0.0205112156, -0.1306399554, -0.1285028905, 0.1305470318, 0.0396983773, -0.0930554122, 0.0168991052, -0.0273870025, -0.0399538986, 0.0342163332, -0.0069861249, 0.0105517777, -0.0163764525, -0.0537054725, 0.1148442253, 0.0485950895, -0.0204066858, 0.0760517791, -0.0188038833, -0.0729855523, 0.0292220954, 0.0116958069, -0.0198259596, 0.0816731974, 0.0728461742, -0.0235890597, -0.0502675772, 0.0223695375, -0.0164925978, 0.0090070488, 0.0377703719, -0.0566323288, 0.0763305277, 0.0175959747, 0.0535196401, 0.0315682255, -0.0203021541, -0.0189432576, 0.0383278653, -0.0335194618, 0.0327296741, -0.0744257495, 0.0400003567, -0.076841563, -0.0274799187, 0.1051809564, 0.0112660704, 0.0227295868, -0.0011534656, 0.0870158747, -0.0097910278, 0.0031475308, 0.0767486468, 0.0119745545, 0.0386066139, 0.0483163409, -0.0131592341, 0.0663885102, 0.0278515834, 0.0025784201, -0.002470986, -0.0920333415, 0.0654593483, 0.0746580362, -0.0580260679, -0.1136363149, 0.0205925182, 0.054774005, 0.0970043465, 0.0392802581, 0.03728256, 0.0760982409, 0.0791644678, -0.0297563616, -0.0344021656, 0.0996989086, -0.0753084496, 0.004157993, 0.0135076698, -0.0325206146, -0.0905002207, -0.0374683924, -0.2257859856, 0.0065273517, -0.0484092571, 0.0144600589, -0.0896175206, -0.0925908387, 0.0186877381, -0.039164111, 0.0283393934, 0.0609993823, -0.1119638309, -0.0780959353, -0.1214412674, 0.0162603073, 0.0397912934, -0.0196052846, 0.0477123857, 0.0525904782, -0.0528692268, 0.085715048, 0.0171430092, 0.1493160725, 0.003472737, -0.0468761437, -0.0616497919, -0.0144484444, 0.1171671301, -0.0027047279, 0.0224972963, 0.0700122342, 0.087666288, 0.0358655937, -0.0832992345, 0.0904073045, 0.1083401069, 0.0203021541, 0.0065621953, 0.044739075, -0.0101975352, -0.0005810882, -0.0398842096, 0.0197678879, 0.0214636046, 0.0545417145, -0.0090825427, -0.0131592341, 0.0692224503, 0.0852504671, -0.0467135385, 0.0085250465, 0.0473871827, 0.0089722052, 0.0334497765, 0.1071321964, 0.0634151995, -0.0846000537, -0.0208015796, 0.0235542171, -0.0058653252, -0.0435311645, -0.0812086165, -0.048362799, 0.0218701139, 0.0369573571, -0.0567252412, -0.0387459882, 0.0456217751, -0.0607670918, -0.07563366, 0.076980941, 0.0098374858, -0.0642049834, -0.0049622972, -0.0495707095, -0.0577473193, 0.0511967391, 0.0416728444, 0.0293846987, -0.0150059406, 0.0807904974, -0.0073577892, 0.0104298256, -0.0421838835, 0.0219630301 ]
712.0707
Jean-Luc Marichal
Alexander Dukhovny, Jean-Luc Marichal
System reliability and weighted lattice polynomials
Revised version (minor changes)
Probability in the Engineering and Informational Sciences 22 (3) (2008) 373-388
10.1017/S0269964808000223
null
math.PR math.RA
null
The lifetime of a system of connected units under some natural assumptions can be represented as a random variable Y defined as a weighted lattice polynomial of random lifetimes of its components. As such, the concept of a random variable Y defined by a weighted lattice polynomial of (lattice-valued) random variables is considered in general and in some special cases. The central object of interest is the cumulative distribution function of Y. In particular, numerous results are obtained for lattice polynomials and weighted lattice polynomials in case of independent arguments and in general. For the general case, the technique consists in considering the joint probability generating function of "indicator" variables. A connection is studied between Y and order statistics of the set of arguments.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 12:54:03 GMT" }, { "version": "v2", "created": "Wed, 28 May 2008 14:06:30 GMT" } ]
2008-05-28T00:00:00
[ [ "Dukhovny", "Alexander", "" ], [ "Marichal", "Jean-Luc", "" ] ]
[ -0.035297893, -0.0187728181, -0.0366021395, 0.063658312, -0.0183149446, -0.0260987971, 0.0821952522, -0.1163276508, -0.0674877986, 0.0873012394, 0.0417913757, -0.0384058841, -0.0779217631, 0.0279580411, 0.0188699439, 0.0245864261, 0.0382671356, 0.0295536611, 0.0633253083, 0.0924072191, -0.0538625866, -0.0168858245, 0.0596068203, -0.0845817477, 0.0624928102, -0.1157726496, 0.1120541617, -0.0532243401, 0.1226546317, -0.0733707771, 0.0836937502, -0.0745362788, -0.0170106981, -0.02518305, -0.0946272165, 0.0471193567, 0.0360193923, 0.0391273834, 0.0113427788, 0.0428181216, -0.1121096611, -0.0446218662, -0.0491728522, 0.0525028408, 0.0883557349, 0.0324674025, -0.0064657307, -0.0521698445, 0.038738884, 0.1023416892, -0.0440113693, 0.1065041795, -0.0358528905, -0.0279857907, -0.0188976936, -0.0362136401, 0.0015531281, 0.0827502534, 0.0037948012, -0.0736482814, 0.0621598139, -0.1074476764, 0.0151098296, 0.0648238063, -0.1057271808, -0.0490063541, -0.1196576431, 0.0094696591, 0.0416248739, 0.0706512854, -0.0733152777, -0.012924524, 0.1151066571, 0.0438726172, -0.050865598, 0.0761457682, 0.0089562852, -0.0287489127, -0.0462868623, 0.0765897706, 0.0088938484, -0.0012166604, 0.0326894, 0.0487011038, -0.0333831497, -0.1285376102, 0.0210899357, 0.0093933465, -0.0678207949, -0.0001067179, -0.0059939818, 0.0445386171, -0.028471414, 0.0978462026, 0.0299976598, -0.068209298, 0.0984012038, 0.0147074554, -0.0567485802, -0.1276496202, -0.0778107643, 0.0157342032, 0.0491451025, -0.0821952522, 0.1252076179, 0.0195220653, -0.072094284, -0.0306081586, -0.1368625909, 0.0186063182, -0.0602173172, 0.0167193245, -0.1357525885, 0.0546950847, -0.0118839014, 0.0313296542, -0.0155122029, 0.0316349044, 0.057275828, 0.0308024064, -0.0596623197, -0.0318846554, 0.0470083579, -0.0390441306, 0.0518368445, -0.0549448356, 0.0442056172, -0.111943163, -0.0412086248, 0.007242728, 0.1081691757, 0.0074716648, 0.0007848023, -0.0309411567, -0.0669327974, -0.0105519062, 0.0691527948, 0.0115925279, 0.098956205, -0.0045509865, 0.0778107643, 0.0032848963, 0.0734262764, 0.0258212965, -0.0226578061, 0.0935727209, 0.0469528586, 0.0087481616, -0.0682647973, 0.0276944172, 0.0192723162, -0.035630893, 0.1051166803, 0.0928512216, -0.0094141588, -0.1823724508, 0.0076381643, 0.0636028051, -0.0025790078, -0.0909642279, 0.0221305583, 0.0750912726, -0.0447606146, 0.0936837196, 0.121433638, 0.056942828, -0.0328004025, 0.0111346543, -0.0552500822, -0.067543298, 0.0236151796, -0.0558050834, -0.0365188904, -0.0599398203, 0.0199938156, 0.0254882984, -0.0640468076, -0.121433638, -0.0467863604, -0.0830277503, 0.0277776662, -0.0120365266, -0.0340768956, -0.1237646267, 0.0002571203, -0.0122238379, 0.0798087567, 0.0000067952, 0.028804414, -0.0365466401, -0.0579973236, 0.1398595721, 0.022158308, 0.1129976586, 0.094849214, -0.0675987974, 0.1026746929, 0.0158729516, -0.0251552984, -0.0466198586, -0.0992337018, -0.070151791, 0.0223941822, 0.0478963554, -0.0302196592, -0.0074786027, 0.0415693745, 0.0819177553, -0.1195466369, -0.0959037095, -0.0548338331, -0.092240721, 0.0851367414, -0.0316349044, -0.1008431986, 0.0457041115, -0.0860247388, 0.0345486477, 0.037573386, 0.1090571731, 0.0055950768, 0.0384891331, 0.0128135243, 0.059218321, -0.0332721509, 0.0589408241, 0.0710952878, 0.0048701102, 0.028887663, -0.0309411567, -0.0081237881, -0.0253217984, -0.0430956185, -0.0520865917, -0.0363523923, -0.0509488471, -0.0161920767, 0.0285546649, -0.0244615506, -0.0380728841, -0.0033473338, -0.0040723002, -0.026959043, 0.0274169166, 0.1075031757, -0.0143050821, -0.0840267465, 0.0470361076, 0.0303029083, -0.0535018407, -0.0854697451, -0.0189115684, 0.083138749, -0.0642133057, -0.0415693745, -0.0192445666 ]
712.0708
Francois Loeser
R. Cluckers, T. Hales, F. Loeser
Transfer Principle for the Fundamental Lemma
31 pages
On the stabilization of the trace formula, 309-347, Stab. Trace Formula Shimura Var. Arith. Appl., 1, Int. Press, Somerville, MA, 2011
null
null
math.RT math.AG math.LO
null
The purpose of this paper is to explain how the identities of various fundamental lemmas fall within the scope of the transfer principle, a general result that allows to transfer theorems about identities of p-adic integrals from one collection of fields to others. In particular, once the fundamental lemma has been established for one collection of fields (for example, fields of positive characteristic), it is also valid for others (fields of characteristic zero).
[ { "version": "v1", "created": "Wed, 5 Dec 2007 15:56:55 GMT" } ]
2012-09-18T00:00:00
[ [ "Cluckers", "R.", "" ], [ "Hales", "T.", "" ], [ "Loeser", "F.", "" ] ]
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712.0709
Paola Castangia
P. Castangia (1, 2), A. Tarchi (2, 3), C. Henkel (1), K.M. Menten (1) ((1) Max-Planck-Institut fuer Radioastronomie, Bonn, (2) INAF-Osservatorio Astronomico di Cagliari, (3) INAF-Istituto di Radioastronomia, Bologna)
New water masers in Seyfert and FIR bright galaxies. II
12 pages, 9 figures, accepted by Astronomy and Astrophysics
null
null
null
astro-ph
null
Recently, a relationship between the water maser detection rate and far infrared (FIR) flux density has been found as a result of a 22 GHz maser survey in a sample comprised of northern galaxies with 100 micron flux density > 50 Jy and a declination >-30 degrees. The survey has been extended toward galaxies with lower FIR flux densities in order to confirm this correlation and to discover additional maser sources for relevant follow-up interferometric studies. A sample of 41 galaxies with 30 Jy < S(100 micron) < 50 Jy and Dec. > -30 degrees was observed with the 100-m telescope at Effelsberg in a search for the 22 GHz water vapor line. The average 3-sigma noise level of the survey is 40 mJy for a 1 km/s channel, corresponding to a detection threshold for the isotropic maser luminosity of about 0.5 solar luminosities at a distance of 25 Mpc. Two detections are reported: a megamaser with an isotropic luminosity of approximately 35 solar luminosities in the Seyfert/HII galaxy NGC613 and a kilomaser of approximately 1 solar luminosity in the merger system NGC520.[abridged]
[ { "version": "v1", "created": "Wed, 5 Dec 2007 12:57:11 GMT" } ]
2007-12-06T00:00:00
[ [ "Castangia", "P.", "" ], [ "Tarchi", "A.", "" ], [ "Henkel", "C.", "" ], [ "Menten", "K. M.", "" ] ]
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712.071
Pedro Castelo Ferreira Dr.
P. Castelo Ferreira
Canonical Functional Quantization of Pseudo-Photons in Planar Systems
5 pages; 1 figure; submitted to Proceedings of XVI International Fall Workshop on Geometry and Physics; http://www.math.ist.utl.pt/~xvi-iwgp/talks/PedroCasteloF.pdf; v2: derivatives on equation (10) corrected
AIPConf.Proc.1023:143-147,2008
10.1063/1.2958165
null
hep-th math-ph math.MP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Extended $U_e(1)\times U_g(1)$ electromagnetism containing both a photon and a pseudo-photon is introduced at variational level and is justified by the violation of the Bianchi identities in conceptual systems, either in the presence of magnetic monopoles or non-regular external fields, not being accounted by the standard Maxwell Lagrangian. It is carried a dimensional reduction that renders a $U_e(1)\times U_g(1)$ Maxwell-BF type theory and it is considered canonical functional quantization in planar systems which may be relevant in Hall systems.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 12:58:10 GMT" }, { "version": "v2", "created": "Fri, 10 Apr 2009 17:50:00 GMT" } ]
2009-04-10T00:00:00
[ [ "Ferreira", "P. Castelo", "" ] ]
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712.0711
Pedro Castelo Ferreira Dr.
P. Castelo Ferreira
Pseudo-Photon Radiative Corrections in Non-Regular Backgrounds
5 pages; 3 figures; based in hep-th/0510063 and hep-ph/0609239; Submitted to Proceedings of New Worlds in Astroparticle Physics 2007
null
null
null
hep-th
null
Extended $U_e(1)\times U_g(1)$ electromagnetism containing both a photon and a pseudo-photon is introduced at variational level and is justified by the violation of the Bianchi identities in conceptual systems, either in the presence of magnetic monopoles or non-regular external fields, not being accounted by the standard Maxwell action. It is shown that in the perturbative quantum field theory regimes there are observable consequences both for the magnetic momenta and second order vacuum polarization radiative corrections in the presence of non-regular strong electromagnetic fields (e.g. rotating magnetic fields).
[ { "version": "v1", "created": "Wed, 5 Dec 2007 13:11:40 GMT" } ]
2007-12-06T00:00:00
[ [ "Ferreira", "P. Castelo", "" ] ]
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712.0712
Ol'ga Galazutdinova A.
N. A. Tikhonov and O. A. Galazutdinova
Stellar Subsystems of the Galaxy NGC 2366
16 pages, 4 figures, Astronomy Reports, 2008,v. 52, n.1, p. 19
null
10.1134/S1063772908010034
null
astro-ph
null
Hubble Space Telescope archive data are used to perform photometry of stars in seven fields at the center and periphery of the galaxy NGC2366. The variation of the number density of stars of various ages with galactocentric radius and along the minor axis of the galaxy are determined. The boundaries of the thin and thick disks of the galaxy are found. The inferred sizes of the subsystems of NGC2366 ($Z_{thin} = 4$ kpc and $Z_{thick} = 8$ kpc for the thin and thick disks, respectively) are more typical for spiral galaxies. Evidence for a stellar halo is found at the periphery of NGC2366 beyond the thick disk of the galaxy.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 13:16:58 GMT" }, { "version": "v2", "created": "Thu, 6 Dec 2007 07:23:04 GMT" } ]
2015-05-13T00:00:00
[ [ "Tikhonov", "N. A.", "" ], [ "Galazutdinova", "O. A.", "" ] ]
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712.0713
Luis Herrera
L. Herrera, J. Ospino and A. Di Prisco
All static spherically symmetric anisotropic solutions of Einstein's equations
8 pages Latex. To appear in Phys. Rev. D. New reference added. Some references corrected
Phys.Rev.D77:027502,2008
10.1103/PhysRevD.77.027502
null
gr-qc astro-ph
null
An algorithm recently presented by Lake to obtain all static spherically symmetric perfect fluid solutions, is extended to the case of locally anisotropic fluids (principal stresses unequal). As expected, the new formalism requires the knowledge of two functions (instead of one) to generate all possible solutions. To illustrate the method some known cases are recovered.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 13:17:29 GMT" }, { "version": "v2", "created": "Thu, 6 Dec 2007 22:11:04 GMT" }, { "version": "v3", "created": "Tue, 15 Jan 2008 14:57:32 GMT" } ]
2008-11-26T00:00:00
[ [ "Herrera", "L.", "" ], [ "Ospino", "J.", "" ], [ "Di Prisco", "A.", "" ] ]
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712.0714
Qasem Exirifard
Qasem Exirifard
Word-sheet corrections to dyons in string theories: A laboratory for the strong OSV conjecture
This paper has been withdrawn
null
null
null
hep-th
null
The explicit computation of arXiv:hep-th/0112157 and arXiv:hep-th/0108106 prove that all the cubic alpha-prime corrections to the backgrounds composed of metric, NS two-form and dilaton can not be written in term of the modified Riemann tensor where the field strength of the NS two form plays the role of torsion. So the outcome of this writing has been trivial.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 14:53:49 GMT" }, { "version": "v2", "created": "Wed, 16 Jan 2008 08:26:20 GMT" } ]
2008-01-16T00:00:00
[ [ "Exirifard", "Qasem", "" ] ]
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712.0715
Iain Stewart
Iain Stewart (Dept. of Computing, Imperial College, London, U.K.)
An iterated search for influence from the future on the Large Hadron Collider
18 pages, minor changes (mainly tracking N&N's title/notation changes etc. in their latest revision of arXiv:0707.1919)
null
null
null
hep-ph hep-th
null
We analyse an iterated version of Nielsen and Ninomiya (N&N)'s proposed card game experiment to search for a specific type of backward causation on the running of the Large Hadron Collider (LHC) at CERN. We distinguish "endogenous" and "exogenous" potential causes of failure of LHC and we discover a curious "cross-talk" between their respective probabilities and occurrence timescales when N&N-style backward causation is in effect. Finally, we note a kind of "statistical cosmic censorship" preventing the influence from the future from showing up in a statistical analysis of the iterated runs.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 18:16:32 GMT" }, { "version": "v2", "created": "Sat, 15 Dec 2007 20:28:12 GMT" } ]
2007-12-16T00:00:00
[ [ "Stewart", "Iain", "", "Dept. of Computing, Imperial College, London, U.K." ] ]
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712.0716
Ivan Smirnov
I.L. Drichko, A.M. Dyakonov, I.Yu. Smirnov, A.V. Suslov, Y.M. Galperin, V. Vinokur, M. Myronov, O.A. Mironov, and D.R. Leadley
Magnetotransport in low-density $p$-Si/SiGe heterostructures: From metal through hopping insulator to Wigner glass
11 pages, 14 figures
null
10.1103/PhysRevB.77.085327
null
cond-mat.mes-hall
null
We study DC and AC transport in low-density $p-$Si/SiGe heterostructures at low temperatures and in a broad domain of magnetic fields up to 18 T. Complex AC conductance is determined from simultaneous measurement of velocity and attenuation of a surface acoustic wave propagating in close vicinity of the 2D hole layer. The observed behaviors of DC and AC conductance are interpreted as an evolution from metallic conductance at B=0 through hopping between localized states in intermediate magnetic fields (close to the plateau of the integer quantum Hall effect corresponding to the Landau-level filling factor $\nu$=1) to formation of the Wigner glass in the extreme quantum limit ($B\gtrsim 14$, $T \lesssim 0.8$ K).
[ { "version": "v1", "created": "Wed, 5 Dec 2007 13:32:14 GMT" } ]
2009-11-13T00:00:00
[ [ "Drichko", "I. L.", "" ], [ "Dyakonov", "A. M.", "" ], [ "Smirnov", "I. Yu.", "" ], [ "Suslov", "A. V.", "" ], [ "Galperin", "Y. M.", "" ], [ "Vinokur", "V.", "" ], [ "Myronov", "M.", "" ], [ "Mironov", "O. A.", "" ], [ "Leadley", "D. R.", "" ] ]
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712.0717
Noam Gross
Noam Gross and Lev Khaykovich
All-optical production of 7Li Bose-Einstein condensation using Feshbach resonances
5 pages, 5 figures
Phys. Rev. A 77 023604 (2008)
10.1103/PhysRevA.77.023604
null
physics.atom-ph
null
We show an all-optical method of making 7Li condensate using tunability of the scattering length in the proximity of a Feshbach resonance. We report the observation of two new Feshbach resonances on |F = 1;mF = 0> state. The narrow (broad) resonance of 7 G (34 G) width is detected at 831 +- 4 G (884 +4 -13 G). Position of the scattering length zero crossing between the resonances is found at 836 +- 4 G. The broad resonance is shown to be favorable for run away evaporation which we perform in a crossed-beam optical dipole trap. Starting directly form the phase space density of a magneto-optical trap we observe a Bose-Einstein condensation threshold in less than 3 s of forced evaporation.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 13:51:47 GMT" } ]
2010-09-07T00:00:00
[ [ "Gross", "Noam", "" ], [ "Khaykovich", "Lev", "" ] ]
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712.0718
Maria Massi
M. Massi, E. Ros, K. M. Menten, M. Kaufman Bernado', G. Torricelli-Ciamponi, J. Neidhofer, A. Boden, D. Boboltz, A. Sargent, G.Torres
Interacting coronae of two T Tauri stars: first observational evidence for solar-like helmet streamers
7 pages, 3 figures, A&A in press
null
10.1051/0004-6361:20078637
null
astro-ph
null
Context {The young binary system V773 Tau A exhibits a persistent radio flaring activity that gradually increases from a level of a few mJy at apoastron to more than 100 mJy at periastron. Interbinary collisions between very large (> 15 R) magnetic structures anchored on the two rotating stars of the system have been proposed to be the origin of these periodic radio flares. Magnetic structures extended over tens of stellar radii, that can also account for the observed fast decay of the radio flares, seem to correspond to the typical solar semi-open quite extended magnetic configurations called helmet streamers.} Aims {We aim to find direct observational evidence for the postulated, solar-like, coronal topologies.} Methods {We performed seven-consecutive-day VLBI observations at 8.4 GHz using an array consisting of the VLBA and the 100-m Effelsberg telescope.} Results {Two distintive structures appear in the radio images here presented. They happen to be associated with the primary and secondary stars of the V773 Tau A system. In one image (Fig.2-B) the two features are extended up to 18 R each and are nearly parallel revealing the presence of two interacting helmet streamers. One image (Fig.2-E) taken a few hours after a flare monitored by the 100-m Effelsberg telescope shows one elongated fading structure substantially rotated with respect to those seen in the B run. The same decay scenario is seen in Fig.2-G for the helmet streamer associated with the other star.} Conclusions {This is the very first direct evidence revealing that even if the flare origin is magnetic reconnection due to interbinary collision, both stars independently emit in the radio range with structures of their own. These structures are helmet streamers, observed for the first time in stars other than the Sun.}
[ { "version": "v1", "created": "Wed, 5 Dec 2007 13:42:25 GMT" } ]
2009-11-13T00:00:00
[ [ "Massi", "M.", "" ], [ "Ros", "E.", "" ], [ "Menten", "K. M.", "" ], [ "Bernado'", "M. Kaufman", "" ], [ "Torricelli-Ciamponi", "G.", "" ], [ "Neidhofer", "J.", "" ], [ "Boden", "A.", "" ], [ "Boboltz", "D.", "" ], [ "Sargent", "A.", "" ], [ "Torres", "G.", "" ] ]
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712.0719
Nikolaos Lazarides
N. Lazarides, G. P. Tsironis and M. Eleftheriou
Dissipative discrete breathers in rf SQUID metamaterials
9 pages, 13 figures, submitted to Nonlinear Phenomena in Complex Systems
Nonlinear Phenomena in Complex Systems 11 (2008) 250-258
null
null
nlin.PS
null
The existence and stability of dissipative discrete breathers (DDBs) in rf superconducting quantum interference device (SQUID) arrays in both one and two dimensions is investigated numerically. In an rf SQUID array, the nonlinearity which is intrinsic to each SQUID due to the presence of the Josephson junction (on-site nonlinearity), along with the weak coupling of each SQUID to its nearest neighbors through magnetic forces, result in the appearance of discrete breathers. We analyze several discrete breather excitations, both in one and two dimensions, which are subjected to unavoidable losses. These losses, however, are counter-balanced by an external flux source leading to linearly stable discrete breather structures up to relatively large coupling parameters. We show that DDB excitations may locally alter the magnetic response of array from paramagnetic to diamagnetic or vice versa, and that they are not destroyed by increasing the dimensionality.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 13:46:14 GMT" } ]
2009-09-18T00:00:00
[ [ "Lazarides", "N.", "" ], [ "Tsironis", "G. P.", "" ], [ "Eleftheriou", "M.", "" ] ]
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712.072
Stuart Mangles
S. P. D. Mangles, A. G. R. Thomas, C. Bellei, A. E. Dangor, C. Kamperidis, S. Kneip, S. R. Nagel, L. Willingale and Z. Najmudin
Self-guided wakefield experiments driven by petawatt class ultra-short laser pulses
15 pages, 8 figures
null
10.1109/TPS.2008.2000961
null
physics.plasm-ph physics.acc-ph
null
We investigate the extension of self-injecting laser wakefield experiments to the regime that will be accessible with the next generation of petawatt class ultra-short pulse laser systems. Using linear scalings, current experimental trends and numerical simulations we determine the optimal laser and target parameters, i.e. focusing geometry, plasma density and target length, that are required to increase the electron beam energy (to > 1 GeV) without the use of external guiding structures.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 13:46:55 GMT" } ]
2009-11-13T00:00:00
[ [ "Mangles", "S. P. D.", "" ], [ "Thomas", "A. G. R.", "" ], [ "Bellei", "C.", "" ], [ "Dangor", "A. E.", "" ], [ "Kamperidis", "C.", "" ], [ "Kneip", "S.", "" ], [ "Nagel", "S. R.", "" ], [ "Willingale", "L.", "" ], [ "Najmudin", "Z.", "" ] ]
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712.0721
Jay Bartroff
Jay Bartroff
Asymptotically optimal multistage tests of simple hypotheses
Published in at http://dx.doi.org/10.1214/009053607000000235 the Annals of Statistics (http://www.imstat.org/aos/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Annals of Statistics 2007, Vol. 35, No. 5, 2075-2105
10.1214/009053607000000235
IMS-AOS-AOS0260
math.ST stat.TH
null
A family of variable stage size multistage tests of simple hypotheses is described, based on efficient multistage sampling procedures. Using a loss function that is a linear combination of sampling costs and error probabilities, these tests are shown to minimize the integrated risk to second order as the costs per stage and per observation approach zero. A numerical study shows significant improvement over group sequential tests in a binomial testing problem.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 13:50:08 GMT" } ]
2009-09-29T00:00:00
[ [ "Bartroff", "Jay", "" ] ]
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712.0722
Nilanjana Datta
Nilanjana Datta and Tony Dorlas
Classical capacity of quantum channels with general Markovian correlated noise
null
Journal of Statistical Physics, vol. 134, nos. 5-6, pp. 1173-1195, 2009
10.1007/s10955-009-9726-0
null
quant-ph
null
The classical capacity of a quantum channel with arbitrary Markovian correlated noise is evaluated. For the general case of a channel with long-term memory, which corresponds to a Markov chain which does not converge to equilibrium, the capacity is expressed in terms of the communicating classes of the Markov chain. For an irreducible and aperiodic Markov chain, the channel is forgetful, and one retrieves the known expression for the capacity.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 13:56:33 GMT" } ]
2015-05-13T00:00:00
[ [ "Datta", "Nilanjana", "" ], [ "Dorlas", "Tony", "" ] ]
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712.0723
Sukmoon Huh
Sukmoon Huh
Dominance of a Rational Map to the Coble Quartic
11 pages, Remark 3.5 added, the title changed
null
null
null
math.AG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We show the dominance of the restriction map from a moduli space of stable sheaves on the projective plane to the Coble quartic. With the dominance and the interpretation of a stable sheaf on the plane in terms of the hyperplane arrangements, we expect to investigate the geometry of the Coble quartic.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 13:58:39 GMT" }, { "version": "v2", "created": "Thu, 6 Dec 2007 10:44:06 GMT" }, { "version": "v3", "created": "Fri, 14 Dec 2007 18:36:55 GMT" }, { "version": "v4", "created": "Wed, 4 Jun 2008 14:06:55 GMT" }, { "version": "v5", "created": "Wed, 5 Nov 2008 15:54:31 GMT" } ]
2008-11-05T00:00:00
[ [ "Huh", "Sukmoon", "" ] ]
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712.0724
Richard Garner
Richard Garner
Understanding the small object argument
42 pages; supersedes the earlier arXiv preprint math/0702290; v2: final journal version, minor corrections only
Applied Categorical Structures 17 (2009), no. 3, pages 247-285
10.1007/s10485-008-9137-4
null
math.CT math.AT
null
The small object argument is a transfinite construction which, starting from a set of maps in a category, generates a weak factorisation system on that category. As useful as it is, the small object argument has some problematic aspects: it possesses no universal property; it does not converge; and it does not seem to be related to other transfinite constructions occurring in categorical algebra. In this paper, we give an "algebraic" refinement of the small object argument, cast in terms of Grandis and Tholen's natural weak factorisation systems, which rectifies each of these three deficiencies.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 14:08:22 GMT" }, { "version": "v2", "created": "Tue, 19 Feb 2008 09:08:03 GMT" } ]
2011-10-17T00:00:00
[ [ "Garner", "Richard", "" ] ]
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712.0725
Fernando Jorge Guti\'errez Pinheiro
F. J. G. Pinheiro (1) ((1) Centro de Astrof\'isica da Universidade do Porto)
Seismic evolution of low/intermediate mass PMS stars
4 pages, 5 figures, accepted for publication on A&A
null
10.1051/0004-6361:20077136
null
astro-ph
null
This article presents a study of the evolution of the internal structure and seismic properties expected for low/intermediate mass Pre-Main Sequence (PMS) stars. Seismic and non-seismic properties of PMS stars were analysed. This was done using 0.8 to 4.4M$_\odot$ stellar models at stages ranging from the end of the Hayashi track up to the Zero-Age Main-Sequence (ZAMS). This research concludes that, for intermediate-mass stars (M$>$1.3M$_\odot$), diagrams comparing the effective temperature ($T_{eff}$) against the small separation can provide an alternative to Christensen-Dalsgaard (C-D) diagrams. The impact of the metal abundance of intermediate mass stars (2.5-4.4M$_\odot$) has over their seismic properties is also evaluated.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 14:11:28 GMT" } ]
2009-11-13T00:00:00
[ [ "Pinheiro", "F. J. G.", "" ] ]
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712.0726
Ruth Nicol
R. M. Nicol, S. C. Chapman, R. O. Dendy
The signature of evolving turbulence in quiet solar wind as seen by ULYSSES
16 pages, 12 figures, to be presented at Fall AGU 2007 in San Fransisco
null
10.1086/586732
null
astro-ph
null
Solar wind fluctuations, such as magnetic field or velocity, show power law power spectra suggestive both of an inertial range of intermittent turbulence (with $\sim -5/3$ exponent) and at lower frequencies, of fluctuations of coronal origin (with $\sim -1$ exponent). The ULYSSES spacecraft spent many months in the quiet fast solar wind above the Sun's polar coronal holes in a highly ordered magnetic field. We use statistical analysis methods such as the generalized structure function (GSF) and extended self-similarity (ESS) to quantify the scaling of the moments of the probability density function of fluctuations in the magnetic field. The GSFs give power law scaling in the ``$f^{-1}$'' range of the form $<| y(t+\tau)-y(t)|^{m}>\sim\tau^{\zeta(m)}$, but ESS is required to reveal scaling in the inertial range, which is of the form $<| y(t+\tau)-y(t)|^{m}>\sim [g(\tau)]^{\zeta(m)}$. We find that $g(\tau)$ is independent of spacecraft position and $g(\tau)\sim\tau^{-log_{10}(\tilde{\lambda}\tau)}$. The ``$f^{-1}$'' scaling fluctuates with radial spacecraft position. This confirms that, whereas the ``$f^{-1}$'' fluctuations are directly influenced by the corona, the inertial range fluctuations are consistent with locally evolving turbulence, but with an ``envelope'' $g(\tau)$, which captures the formation of the quiet fast solar wind.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 14:38:09 GMT" }, { "version": "v2", "created": "Mon, 18 Feb 2008 15:55:47 GMT" } ]
2009-11-13T00:00:00
[ [ "Nicol", "R. M.", "" ], [ "Chapman", "S. C.", "" ], [ "Dendy", "R. O.", "" ] ]
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712.0727
Norma Sanchez
Marina Ramon Medrano (1,2) and Norma G. Sanchez ((1) Observatoire de Paris, LERMA, (2) Universidad Complutense de Madrid, Dept de Fisica Teorica)
Semiclassical and Quantum Black Holes and their Evaporation, de Sitter and Anti-de Sitter Regimes, Gravitational and String Phase Transitions
review paper, no figures. to appear in Int Jour Mod Phys A
Int.J.Mod.Phys.A22:6089-6131,2007
10.1142/S0217751X07038669
null
hep-th astro-ph gr-qc hep-ph
null
An effective string theory in physically relevant cosmological and black hole space times is reviewed. Explicit computations of the quantum string entropy, partition function and quantum string emission by black holes (Schwarzschild, rotating, charged, asymptotically flat, de Sitter dS and AdS space times) in the framework of effective string theory in curved backgrounds provide an amount of new quantum gravity results as: (i) gravitational phase transitions appear with a distinctive universal feature: a square root branch point singularity in any space time dimensions. This is of the type of the de Vega - Sanchez transition for the thermal self-gravitating gas of point particles. (ii) There are no phase transitions in AdS alone. (iii) For $dS$ background, upper bounds of the Hubble constant H are found, dictated by the quantum string phase transition.(iv) The Hawking temperature and the Hagedorn temperature are the same concept but in different (semiclassical and quantum) gravity regimes respectively. (v) The last stage of black hole evaporation is a microscopic string state with a finite string critical temperature which decays as usual quantum strings do in non-thermal pure quantum radiation (no information loss).(vi) New lower string bounds are given for the Kerr-Newman black hole angular momentum and charge, which are entirely different from the upper classical bounds. (vii) Semiclassical gravity states undergo a phase transition into quantum string states of the same system, these states are duals of each other in the precise sense of the usual classical-quantum (wave-particle) duality, which is universal irrespective of any symmetry or isommetry of the space-time and of the number or the kind of space-time dimensions.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 14:13:49 GMT" } ]
2008-11-26T00:00:00
[ [ "Medrano", "Marina Ramon", "" ], [ "Sanchez", "Norma G.", "" ] ]
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712.0728
Denis Denisov
Denis Denisov, Vsevolod Shneer
Asymptotics for first-passage times of L\'evy processes and random walks
null
null
null
Eurandom research report 2006-017
math.PR
null
We study the exact asymptotics for the distribution of the first time $\tau_x$ a L\'evy process $X_t$ crosses a negative level $-x$. We prove that $\mathbf P(\tau_x>t)\sim V(x)\mathbf P(X_t\ge 0)/t$ as $t\to\infty$ for a certain function $V(x)$. Using known results for the large deviations of random walks we obtain asymptotics for $\mathbf P(\tau_x>t)$ explicitly in both light and heavy tailed cases. We also apply our results to find asymptotics for the distribution of the busy period in an M/G/1 queue.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 14:13:52 GMT" } ]
2007-12-06T00:00:00
[ [ "Denisov", "Denis", "" ], [ "Shneer", "Vsevolod", "" ] ]
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712.0729
Marcella Di Criscienzo Miss
M. Di Criscienzo, C. Greco, M. Dall'Ora, V. Ripepi, G. Clementini, M. Marconi, L. Federici, L. Di Fabrizio, I. Musella, L. Baldacci, M. Maio
NGC 2419: an "intergalactic wanderer" or a simple Galactic Globular Cluster?
3 pages, 2 greyscale figures. Proceedings of the workshop "XXI Century challenges for stellar evolution", held in Cefalu' (Sicily, Italy), August 29 - September 2, 2007; S. Cassisi and M. Salaris Eds. To be published in Mem. SAIt Vol. 79 No. 2
null
null
null
astro-ph
null
We have carried out a new photometric study of the remote Galactic globular cluster NGC 2419, using proprietary and archive B,V,I time-series CCD photometry of the cluster, that allowed us to discover a large number of new variable stars and to obtain a new colour magnitude diagram that reaches V ~26 mag over a field of 50X43 square arcmin centered on NGC 2419. The new variables include 39 RR Lyrae and 11 SX Phoenicis stars. The pulsation properties of the new RR Lyrae stars confirm and strengthen the classification of NGC 2419 as an Oosterhoff type II cluster.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 14:16:17 GMT" } ]
2007-12-06T00:00:00
[ [ "Di Criscienzo", "M.", "" ], [ "Greco", "C.", "" ], [ "Dall'Ora", "M.", "" ], [ "Ripepi", "V.", "" ], [ "Clementini", "G.", "" ], [ "Marconi", "M.", "" ], [ "Federici", "L.", "" ], [ "Di Fabrizio", "L.", "" ], [ "Musella", "I.", "" ], [ "Baldacci", "L.", "" ], [ "Maio", "M.", "" ] ]
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712.073
Mireille Calvet
Roland Omn\`es
Possible agreement of wave function reduction from the basic principles of quantum mechanics
"A shorter and clearer version of the previous paper, with improvements in the physical content"
null
null
LPT Orsay 08-25
quant-ph
null
Reduction is shown to be a possible consequence of the basic principles of quantum mechanics, involving no branching of the quantum state of the universe. The key feature of a measurement is attributed to the creation of macroscopic germs of ionized tracks, bubbles, sparks and so on, in a superposed quantum state, the main mechanism being a breaking and a restoration of ``classicality'' in nearby macroscopic objects and their small patterns. A new significance of quantum probabilities, involving no absolute randomness, is also proposed.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 14:20:16 GMT" }, { "version": "v2", "created": "Tue, 19 Feb 2008 10:15:31 GMT" } ]
2008-02-19T00:00:00
[ [ "Omnès", "Roland", "" ] ]
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712.0731
Stefania Patrizi
Stefania Patrizi
The Neumann problem for singular fully nonlinear operators
null
null
null
null
math.AP
null
We consider the Neumann problem in $C^2$ bounded domains for fully nonlinear second order operators which are elliptic, homogenous with lower order terms. Inspired by \cite{bnv}, we define the concept of principal eigenvalue and we characterize it through the maximum principle. Moreover, Lipschitz regularity, uniqueness and existence results for solutions of the Neumann problem are given.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 14:24:33 GMT" } ]
2007-12-06T00:00:00
[ [ "Patrizi", "Stefania", "" ] ]
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712.0732
Charles Gale
Simon Turbide, Charles Gale, Evan Frodermann, Ulrich Heinz
Electromagnetic radiation from nuclear collisions at RHIC energies
null
Phys.Rev.C77:024909,2008
10.1103/PhysRevC.77.024909
CERN-PH-TH/2007-239
hep-ph nucl-th
null
The hot and dense strongly interacting matter created in collisions of heavy nuclei at RHIC energies is modeled with relativistic hydrodynamics, and the spectra of real and virtual photons produced at mid-rapidity in these events are calculated. Several different sources are considered, and their relative importance is compared. Specifically, we include jet fragmentation, jet-plasma interactions, the emission of radiation from the thermal medium and from primordial hard collisions. Our calculations consistently take into account jet energy loss, as evaluated in the AMY formalism. We obtain results for the spectra, the nuclear modification factor (R_AA), and the azimuthal anisotropy (v_2) that agree with the photon measurements performed by the PHENIX collaboration at RHIC.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 15:08:18 GMT" }, { "version": "v2", "created": "Thu, 20 Dec 2007 20:45:45 GMT" } ]
2008-11-26T00:00:00
[ [ "Turbide", "Simon", "" ], [ "Gale", "Charles", "" ], [ "Frodermann", "Evan", "" ], [ "Heinz", "Ulrich", "" ] ]
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712.0733
Hiroki Matui
Hiroki Matui
An absorption theorem for minimal AF equivalence relations on Cantor sets
12 pages
null
null
null
math.DS math.OA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We prove that a `small' extension of a minimal AF equivalence relation on a Cantor set is orbit equivalent to the AF relation. By a `small' extension we mean an equivalence relation generated by the minimal AF equivalence relation and another AF equivalence relation which is defined on a closed thin subset. The result we obtain is a generalization of the main theorem in [GMPS2].
[ { "version": "v1", "created": "Wed, 5 Dec 2007 14:39:32 GMT" }, { "version": "v2", "created": "Tue, 9 Sep 2008 04:07:50 GMT" } ]
2008-09-09T00:00:00
[ [ "Matui", "Hiroki", "" ] ]
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712.0734
Mario Antonelli
Mario Antonelli
Precision tests of Standard Model with leptonic and semileptonic kaon decays
23 pages, 11 figures, Proceeding of the 23rd International Symposium on Lepton-Photon Interactions at High Energy (LP07), Daegu, Korea, 13-18 Aug 2007; typos and references addded
null
null
null
hep-ex
null
Till the middle of 2004 it appeared that the unitarity relation Vud^2+Vus^2+Vub^2=1 might not hold at the 2.3sigma level. At that time, however, Vus was inferred from old experimental data. Since then, a large experimental and theoretical effort has been invested leading to a removal of the problem. Thanks to the new and improved measurements by BNL-E865, KLOE, KTeV, ISTRA+ and NA48, the Kl3 decay rate moved up so that Vus is now consistent with unitarity. On the theory side, much progress has been made in order to tame the systematic uncertainties related to the computation of the Kl3 form factors. This joint progress allowed to assess the validity of the CKM unitarity relation at the level of less than $1%. Recent measurements of kaon decays contributing to the determination of Vus, Vus/Vud are summarized, and up-to-date evaluations of Vusf0 and Vus are presented. In addition, we discuss the sensitivity of Kl3 and Kl2 decays to various scenarios of physics beyond Standard Model.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 14:42:02 GMT" }, { "version": "v2", "created": "Tue, 11 Dec 2007 13:52:55 GMT" } ]
2007-12-11T00:00:00
[ [ "Antonelli", "Mario", "" ] ]
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712.0735
Min-Young Choi
Min-Young Choi, Kyung Kiu Kim, Choonkyu Lee, Ki-Myeong Lee
Higgs Structures of Dyonic Instantons
1+27 pages, 6 figures
JHEP0804:097,2008
10.1088/1126-6708/2008/04/097
null
hep-th
null
We study Higgs field configurations of dyonic instantons in spontaneously broken (4+1)-dimensional Yang-Mills theory. The adjoint scalar field solutions to the covariant Laplace equation in the ADHM instanton background are constructed in general noncanonical basis, and they are used to study explicitly the Higgs field configurations of dyonic instantons when the gauge fields are taken by Jackiw-Nohl-Rebbi instanton solutions. For these solutions corresponding to small instanton number we then consider in some detail the zero locus of the Higgs field, which describes the cross section of supertubes connecting parallel D4-branes in string theory. Also the information on the Higgs zeroes is used to discuss the residual gauge freedom concerning the Jackiw-Nohl-Rebbi solutions.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 14:42:12 GMT" } ]
2008-11-26T00:00:00
[ [ "Choi", "Min-Young", "" ], [ "Kim", "Kyung Kiu", "" ], [ "Lee", "Choonkyu", "" ], [ "Lee", "Ki-Myeong", "" ] ]
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712.0736
Alexej Pashkin
A. Pashkin, K. Rabia, S. Frank, C. A. Kuntscher, R. Haumont, R. Saint-Martin, and J. Kreisel
Pressure-induced phase transitions in the multiferroic perovskite BiFeO3 studied by far-infrared micro-spectroscopy
null
null
null
null
cond-mat.other
null
We present the results of pressure-dependent far-infrared reflectivity measurements on the multiferroic perovskite BiFeO3 at room temperature. The observed behavior of the infrared-active phonon modes as a funtion of pressure clearly reveals two structural phase transitions around 3.0 and 7.5 GPa, supporting the results of recent Raman and x-ray diffraction studies under pressure. Based on the pressure-dependent frequency shifts of the infrared-active phonon modes we discuss the possible character of the phase transitions.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 14:50:15 GMT" } ]
2007-12-06T00:00:00
[ [ "Pashkin", "A.", "" ], [ "Rabia", "K.", "" ], [ "Frank", "S.", "" ], [ "Kuntscher", "C. A.", "" ], [ "Haumont", "R.", "" ], [ "Saint-Martin", "R.", "" ], [ "Kreisel", "J.", "" ] ]
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712.0737
Song-Ho Chong
Song-Ho Chong, Martin Aichele, Hendrik Meyer, Matthias Fuchs, and J\"org Baschnagel
Structural and conformational dynamics of supercooled polymer melts: Insights from first-principles theory and simulations
54 pages, 10 figures
Phys. Rev. E 76, 051806 (2007)
10.1103/PhysRevE.76.051806
null
cond-mat.soft
null
We report on quantitative comparisons between simulation results of a bead-spring model and mode-coupling theory calculations for the structural and conformational dynamics of a supercooled, unentangled polymer melt. We find semiquantitative agreement between simulation and theory, except for processes that occur on intermediate length scales between the compressibility plateau and the amorphous halo of the static structure factor. Our results suggest that the onset of slow relaxation in a glass-forming melt can be described in terms of monomer-caging supplemented by chain connectivity. Furthermore, a unified atomistic description of glassy arrest and of conformational fluctuations that (asymptotically) follow the Rouse model, emerges from our theory.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 14:46:02 GMT" } ]
2009-11-13T00:00:00
[ [ "Chong", "Song-Ho", "" ], [ "Aichele", "Martin", "" ], [ "Meyer", "Hendrik", "" ], [ "Fuchs", "Matthias", "" ], [ "Baschnagel", "Jörg", "" ] ]
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712.0738
T. Roy Choudhury
T. Roy Choudhury, A. Ferrara and S. Gallerani
On the minimum mass of reionization sources
6 pages, 2 figures
null
10.1111/j.1745-3933.2008.00433.x
null
astro-ph
null
By means of carefully calibrated semi-analytical reionization models, we estimate the minimum mass of star-forming haloes required to match the current data. Models which do not include haloes of total mass M < 10^9 M_sun fail at reproducing the Gunn-Peterson and electron scattering optical depths simultaneously, as they contribute too few (many) photons at high (low, z \approx 6) redshift. Marginally acceptable solutions require haloes with M \approx 5 \times 10^7 M_sun at z \approx 10, corresponding to virial temperatures (\sim 10^4K) for which cooling can be ensured by atomic transitions. However, a much better match to the data is obtained if minihaloes (M \sim 10^6 M_sun) are included in the analysis. We have critically examined the assumptions made in our model and conclude that reionization in the large-galaxies-only scenario can remain viable only if metal-free stars and/or some other exotic sources at z > 6 are included.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 14:48:26 GMT" } ]
2009-11-13T00:00:00
[ [ "Choudhury", "T. Roy", "" ], [ "Ferrara", "A.", "" ], [ "Gallerani", "S.", "" ] ]
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712.0739
Sonja Schuh
S. Schuh, I. Traulsen, T. Nagel, E. Reiff, D. Homeier, H. Schwager, D.-J. Kusterer, R. Lutz, M. R. Schreiber
A new period determination for the close PG1159 binary SDSSJ212531.92-010745.9
3 pages, 2 figures, accepted for publication in Astronomical Notes
null
10.1002/asna.200710920
null
astro-ph
null
Methods to measure masses of PG1159 stars in order to test evolutionary scenarios are currently based on spectroscopic masses or asteroseismological mass determinations. One recently discovered PG1159 star in a close binary system may finally allow the first dynamical mass determination, which has so far been analysed on the basis of one SDSS spectrum and photometric monitoring. In order to be able to phase future radial velocity measurements of the system SDSSJ212531.92-010745.9, we follow up on the photometric monitoring of this system to provide a solid observational basis for an improved orbital ephemeris determination. New white-light time series of the brightness variation of SDSSJ212531.92-010745.9 with the Tuebingen 80cm and Goettingen 50cm telescopes extend the monitoring into a second season (2006), tripling the length of overall observational data available, and significantly increasing the time base covered. We give the ephemeris for the orbital motion of the system, based on a sine fit which now results in a period of 6.95573(5)h, and discuss the associated new amplitude determination in the context of the phased light curve variation profile. The accuracy of the ephemeris has been improved by more than one order of magnitude compared to that previously published for 2005 alone.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 15:10:06 GMT" } ]
2009-11-13T00:00:00
[ [ "Schuh", "S.", "" ], [ "Traulsen", "I.", "" ], [ "Nagel", "T.", "" ], [ "Reiff", "E.", "" ], [ "Homeier", "D.", "" ], [ "Schwager", "H.", "" ], [ "Kusterer", "D. -J.", "" ], [ "Lutz", "R.", "" ], [ "Schreiber", "M. R.", "" ] ]
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712.074
Ji\v{r}\'i Min\'a\v{r}
Ji\v{r}\'i Min\'a\v{r}, Hugues de Riedmatten, Christoph Simon, Hugo Zbinden, Nicolas Gisin
Phase noise measurements in long fiber interferometers for quantum repeaters applications
9 pages with 10 figures
J. Min\'a\v{r}, H. de Riedmatten, C. Simon, H. Zbinden, and N. Gisin, Phys. Rev. A77, 052325 (2008)
10.1103/PhysRevA.77.052325
null
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Many protocols for long distance quantum communication require interferometric phase stability over long distances of optical fibers. In this paper we investigate the phase noise in long optical fibers both in laboratory environment and in installed commercial fibers in an urban environment over short time scales (up to hundreds of us). We show that the phase fluctuations during the travel time of optical pulses in long fiber loops are small enough to obtain high visibility first order interference fringes in a Sagnac interferometer configuration for fiber lengths up to 75 km. We also measure phase fluctuations in a Mach-Zehnder interferometer in installed fibers with arm length 36.5 km. We verify that the phase noise respects gaussian distribution and measure the mean phase change as a function of time difference. The typical time needed for a mean phase change of 0.1 rad is of order of 100 us, which provides information about the time scale available for active phase stabilization. Our results are relevant for future implementations of quantum repeaters in installed optical fiber networks.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 14:49:34 GMT" }, { "version": "v2", "created": "Mon, 18 Aug 2008 15:36:08 GMT" } ]
2008-08-22T00:00:00
[ [ "Minář", "Jiří", "" ], [ "de Riedmatten", "Hugues", "" ], [ "Simon", "Christoph", "" ], [ "Zbinden", "Hugo", "" ], [ "Gisin", "Nicolas", "" ] ]
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712.0741
Elvira Ritz
Elvira Ritz and Martin Dressel
Analysis of broadband microwave conductivity and permittivity measurements of semiconducting materials
9 pages, 10 figures, accepted for publication in the Journal of Applied Physics
J. Appl. Phys. 103, 084902 (2008), http://jap.aip.org/
10.1063/1.2906131
null
cond-mat.mtrl-sci cond-mat.dis-nn
null
We perform broadband phase sensitive measurements of the reflection coefficient from 45 MHz up to 20 GHz employing a vector network analyzer with a 2.4 mm coaxial sensor which is terminated by the sample under test. While the material parameters (conductivity and permittivity) can be easily extracted from the obtained impedance data if the sample is metallic, no direct solution is possible if the material under investigation is an insulator. Focusing on doped semiconductors with largely varying conductivity, here we present a closed calibration and evaluation procedure for frequencies up to 5 GHz, based on the rigorous solution for the electromagnetic field distribution inside the sample combined with the variational principle; basically no limiting assumptions are necessary. A simple static model based on the electric current distribution proves to yield the same frequency dependence of the complex conductivity up to 1 GHz. After a critical discussion we apply the developed method to the hopping transport in Si:P at temperature down to 1 K.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 16:34:59 GMT" }, { "version": "v2", "created": "Thu, 7 Feb 2008 17:46:18 GMT" }, { "version": "v3", "created": "Sun, 2 Mar 2008 14:46:21 GMT" } ]
2008-05-12T00:00:00
[ [ "Ritz", "Elvira", "" ], [ "Dressel", "Martin", "" ] ]
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712.0742
Sonja Schuh
Sonja Schuh, Thorsten Nagel, Iris Traulsen, Benjamin Beeck
New Light Curves and Spectra of the close PG1159 Binary System SDSSJ212531.92-010745.9
2 pages, to appear in "Hydrogen-Deficient Stars", ASP conference series
null
null
null
astro-ph
null
Methods to measure masses of PG1159 stars in order to test evolutionary scenarios are currently based on spectroscopic masses or asteroseismological mass determinations. SDSSJ212531.92-010745.9, a recently discovered PG1159 star in a close binary system, may finally allow the first dynamical mass determination, and has so far been analysed on the basis of one SDSS spectrum and photometric monitoring. In order to be able to phase radial velocity measurements of the system SDSSJ212531.92-010745.9, we have followed up the photometric monitoring of this system. New white light time series of the brightness variation of SDSSJ212531.92-010745.9 with the Tuebingen 80cm and Goettingen 50cm telescopes extend the monitoring into a second season (2006). We give the improved ephemeris for the orbital motion of the system, based on a sine fit which now results in a period of 6.95573(5)h. In 2007, we have obtained a series of phase-resolved medium-resolution spectra with the TWIN spectrograph at the 3.5m telescope at Calar Alto, which will allow us to derive the radial velocity curves for both components of the system, and to perform spectral analyses of the irradiating and irradiated components at different phases. We briefly describe the newly obtained spectra. The light curve and radial velocities combined will allow us to carry out a mass determination.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 15:03:10 GMT" } ]
2007-12-06T00:00:00
[ [ "Schuh", "Sonja", "" ], [ "Nagel", "Thorsten", "" ], [ "Traulsen", "Iris", "" ], [ "Beeck", "Benjamin", "" ] ]
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712.0743
Yevgeny Kats
Yevgeny Kats, Pavel Petrov
Effect of curvature squared corrections in AdS on the viscosity of the dual gauge theory
18 pages; v4: added note and references; published version
JHEP 0901:044,2009
10.1088/1126-6708/2009/01/044
null
hep-th hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We use the real-time finite-temperature AdS/CFT correspondence to compute the effect of general R^2 corrections to the gravitational action in AdS space on the shear viscosity of the dual gauge theory. The R^2 terms in AdS_5 are determined by the central charges of the CFT. We present an example of a four-dimensional gauge theory in which the conjectured lower bound of 1/(4\pi) on the viscosity-to-entropy ratio is violated for finite N.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 19:49:32 GMT" }, { "version": "v2", "created": "Tue, 26 Feb 2008 22:24:34 GMT" }, { "version": "v3", "created": "Wed, 9 Apr 2008 19:45:47 GMT" }, { "version": "v4", "created": "Tue, 20 Jan 2009 20:31:26 GMT" } ]
2009-01-27T00:00:00
[ [ "Kats", "Yevgeny", "" ], [ "Petrov", "Pavel", "" ] ]
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712.0744
Vitorino Ramos Dr.
Vitorino Ramos, C. M. Fernandes, A. C. Rosa, A. Abraham
Computational Chemotaxis in Ants and Bacteria over Dynamic Environments
8 pages, 6 figures, in CEC 07 - IEEE Congress on Evolutionary Computation, ISBN 1-4244-1340-0, pp. 1009-1017, Sep. 2007
null
10.1109/CEC.2007.4424594
null
cs.MA cs.AI q-bio.PE q-bio.QM
null
Chemotaxis can be defined as an innate behavioural response by an organism to a directional stimulus, in which bacteria, and other single-cell or multicellular organisms direct their movements according to certain chemicals in their environment. This is important for bacteria to find food (e.g., glucose) by swimming towards the highest concentration of food molecules, or to flee from poisons. Based on self-organized computational approaches and similar stigmergic concepts we derive a novel swarm intelligent algorithm. What strikes from these observations is that both eusocial insects as ant colonies and bacteria have similar natural mechanisms based on stigmergy in order to emerge coherent and sophisticated patterns of global collective behaviour. Keeping in mind the above characteristics we will present a simple model to tackle the collective adaptation of a social swarm based on real ant colony behaviors (SSA algorithm) for tracking extrema in dynamic environments and highly multimodal complex functions described in the well-know De Jong test suite. Later, for the purpose of comparison, a recent model of artificial bacterial foraging (BFOA algorithm) based on similar stigmergic features is described and analyzed. Final results indicate that the SSA collective intelligence is able to cope and quickly adapt to unforeseen situations even when over the same cooperative foraging period, the community is requested to deal with two different and contradictory purposes, while outperforming BFOA in adaptive speed. Results indicate that the present approach deals well in severe Dynamic Optimization problems.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 15:02:19 GMT" } ]
2016-11-18T00:00:00
[ [ "Ramos", "Vitorino", "" ], [ "Fernandes", "C. M.", "" ], [ "Rosa", "A. C.", "" ], [ "Abraham", "A.", "" ] ]
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712.0745
Andriy Ganshyn
T. R. Charlton, R. M. Dalgliesh, A. Ganshin, O. Kirichek, S. Langridge, P. V. E. McClintock
Neutron reflection from the surface of normal and superfluid 4He
to be published in Low Temperature Physics
null
null
null
cond-mat.soft cond-mat.other
null
The reflection of neutrons from a helium surface has been observed for the first time. The 4He surface is smoother in the superfluid state at 1.54 K than in the case of the normal liquid at 2.3 K. In the superfluid state we also observe a surface layer ~200 Angstroms thick which has a subtly different neutron scattering cross-section, which may be explained by an enhanced Bose-Einstein condensate fraction close to the helium surface.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 15:10:38 GMT" } ]
2007-12-06T00:00:00
[ [ "Charlton", "T. R.", "" ], [ "Dalgliesh", "R. M.", "" ], [ "Ganshin", "A.", "" ], [ "Kirichek", "O.", "" ], [ "Langridge", "S.", "" ], [ "McClintock", "P. V. E.", "" ] ]
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712.0746
Cyrille Marquet
Cyrille Marquet
Testing BFKL evolution with Mueller-Navelet jets
4 pages, 1 figure, Proceedings of the XXXVIIth International Symposium on Multiparticle Dynamics (ISMD07), Berkeley, USA, August 4-9 2007
Acta Phys.Polon.Supp.1:463-467,2008
null
null
hep-ph
null
We study the correlation in azimuthal angle between Mueller-Navelet jets produced in hadron-hadron collisions. We argue that this observable would test the BFKL approach at next-to-leading logarithmic accuracy. In order to motivate such a measurement, we give predictions for jets separated by large rapidity intervals within the Tevatron and LHC ranges.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 15:11:11 GMT" } ]
2009-01-16T00:00:00
[ [ "Marquet", "Cyrille", "" ] ]
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712.0747
Alon Faraggi
Alon E. Faraggi, Costas Kounnas, John Rizos
Spinor-Vector Duality in N=2 Heterotic String Vacua
19 pages. 1 figure
Nucl.Phys.B799:19-33,2008
10.1016/j.nuclphysb.2008.02.009
null
hep-th hep-ph
null
Classification of the N=1 space-time supersymmetric fermionic Z2XZ2 heterotic-string vacua with symmetric internal shifts, revealed a novel spinor-vector duality symmetry over the entire space of vacua, where the S_t <-> V duality interchanges the spinor plus anti-spinor representations with vector representations. In this paper we demonstrate that the spinor--vector duality exists also in fermionic Z2 heterotic string models, which preserve N=2 space-time supersymmetry. In this case the interchange is between spinorial and vectorial representations of the unbroken SO(12) GUT symmetry. We provide a general algebraic proof for the existence of the S_t <-> V duality map. We present a novel basis to generate the free fermionic models in which the ten dimensional gauge degrees of freedom are grouped into four groups of four, each generating an SO(8) modular block. In the new basis the GUT symmetries are produced by generators arising from the trivial and non--trivial sectors, and due to the triality property of the SO(8) representations. Thus, while in the new basis the appearance of GUT symmetries is more cumbersome, it may be more instrumental in revealing the duality symmetries that underly the string vacua.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 15:16:17 GMT" } ]
2008-11-26T00:00:00
[ [ "Faraggi", "Alon E.", "" ], [ "Kounnas", "Costas", "" ], [ "Rizos", "John", "" ] ]
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712.0748
Francois Ducastelle
Hakim Amara (LPS, PCPM), Christophe Bichara (CRMCN), Fran\c{c}ois Ducastelle (LEM)
Understanding the nucleation mechanisms of Carbon Nanotubes in catalytic Chemical Vapor Deposition
null
null
10.1103/PhysRevLett.100.056105
null
cond-mat.mtrl-sci
null
The nucleation of carbon caps on small nickel clusters is studied using a tight binding model coupled to grand canonical Monte Carlo simulations. It takes place in a well defined carbon chemical potential range, when a critical concentration of surface carbon atoms is reached. The solubility of carbon in the outermost Ni layers, that depends on the initial, crystalline or disordered, state of the catalyst and on the thermodynamic conditions, is therefore a key quantity to control the nucleation.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 15:22:17 GMT" } ]
2009-11-13T00:00:00
[ [ "Amara", "Hakim", "", "LPS, PCPM" ], [ "Bichara", "Christophe", "", "CRMCN" ], [ "Ducastelle", "François", "", "LEM" ] ]
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712.0749
Bogdan Ranguelov
Bogdan Ranguelov, Stoyan Stoyanov
Instabilities at vicinal crystal surfaces - competition between the electromigration of the adatoms and the kinetic memory effect
15 pages, 6 figures
null
10.1103/PhysRevB.77.205406
null
physics.chem-ph
null
We studied the step dynamics during sublimation and growth in the presence of electromigration force acting on the adatoms. In the limit of fast surface diffusion and slow kinetics of atom attachment-detachment at the steps we formulate a model free of the quasi-static approximation in the calculation of the adatom concentration on the terraces. Numerical integration of the equations for the time evolution of the adatom concentrations and the equations of step motion reveals two different step bunching instabilities: 1) step density waves (small bunches which do not manifest any coarsening) induced by the kinetic memory effect and 2) step bunching with coarsening when the dynamics is dominated by the electromigration. The model developed in this paper also provides very instructive illustrations of the Popkov-Krug dynamical phase transition during sublimation and growth of a vicinal crystal surface.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 15:32:11 GMT" } ]
2009-11-13T00:00:00
[ [ "Ranguelov", "Bogdan", "" ], [ "Stoyanov", "Stoyan", "" ] ]
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712.075
Michael Thorwart
R. Egger, A. O. Gogolin
Vibration-induced correction to the current through a single molecule
4 pages, no figures, to appear in PRB, published version
Phys. Rev. B 77, 113405 (2008)
10.1103/PhysRevB.77.113405
null
cond-mat.mes-hall
null
We provide analytical results for the perturbative correction to the current-voltage relation through a vibrating molecule for weak electron-phonon coupling. The nonlinear conductance exhibits a step-like feature at $eV=\hbar \omega_0$, where $\omega_0$ is the vibration frequency. We establish criteria for the sign change of the step in the conductance (up or down). This transition turns out to be nonuniversal and is governed by essentially all system parameters.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 15:46:50 GMT" }, { "version": "v2", "created": "Wed, 23 Jan 2008 15:19:25 GMT" }, { "version": "v3", "created": "Wed, 6 Feb 2008 10:20:04 GMT" } ]
2008-03-14T00:00:00
[ [ "Egger", "R.", "" ], [ "Gogolin", "A. O.", "" ] ]
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712.0751
Efim Brener
Efim A. Brener and D.E. Temkin
Melting of alloys along grain boundaries
submitted to Acta Materialia
null
null
null
cond-mat.mtrl-sci
null
We discuss melting of alloys along grain boundaries as a free boundary problem for two moving solid-liquid interfaces. One of them is the melting front and the other is the solidification front. The presence of the triple junction plays an important role in controlling the velocity of this process. The interfaces strongly interact via the diffusion field in the thin liquid layer between them. In the liquid film migration (LFM) mechanism the system chooses a more efficient kinetic path, which is controlled by diffusion in the liquid film on relatively short distances. However, only weak coherency strain energy is the effective driving force for LFM in the case of melting of one-phase alloys. The process with only one melting front would be controlled by the very slow diffusion in the mother solid phase on relatively large distances.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 15:37:53 GMT" } ]
2007-12-06T00:00:00
[ [ "Brener", "Efim A.", "" ], [ "Temkin", "D. E.", "" ] ]
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712.0752
Torben Swart
Torben Swart, Vidian Rousse
A Mathematical Justification for the Herman-Kluk Propagator
Typos corrected
null
null
null
math-ph math.MP
null
A class of Fourier Integral Operators which converge to the unitary group of the Schroedinger equation in semiclassical limit $\eps\to 0$ is constructed. The convergence is in the uniform operator norm and allows for an error bound of order $O(\eps^{1-\rho})$ for Ehrenfest timescales, where $\rho$ can be made arbitrary small. For the shorter times of order O(1), the error can be improved to arbitrary order in $\eps$. In the chemical literature the approximation is known as the Herman-Kluk propagator.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 16:24:53 GMT" }, { "version": "v2", "created": "Fri, 21 Dec 2007 10:56:41 GMT" } ]
2011-11-10T00:00:00
[ [ "Swart", "Torben", "" ], [ "Rousse", "Vidian", "" ] ]
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712.0753
Cesar Seoanez
C. Seoanez, F. Guinea and A. H. Castro Neto
Surface dissipation in nanoelectromechanical systems: Unified description with the standard tunneling model and effects of metallic electrodes
17 pages, 7 figures
Phys. Rev. B 77, 125107 (2008)
10.1103/PhysRevB.77.125107
null
cond-mat.mes-hall
null
By modifying and extending recent ideas [C. Seoanez et al., Europhys. Lett. 78, 60002 (2007)], a theoretical framework to describe dissipation processes in the surfaces of vibrating micro- and nanoelectromechanical devices, thought to be the main source of friction at low temperatures, is presented. Quality factors as well as frequency shifts of flexural and torsional modes in doubly clamped beams and cantilevers are given, showing the scaling with dimensions, temperature, and other relevant parameters of these systems. Full agreement with experimental observations is not obtained, leading to a discussion of limitations and possible modifications of the scheme to reach a quantitative fitting to experiments. For nanoelectromechanical systems covered with metallic electrodes, the friction due to electrostatic interaction between the flowing electrons and static charges in the device and substrate is also studied.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 15:40:49 GMT" }, { "version": "v2", "created": "Sat, 8 Mar 2008 11:54:29 GMT" } ]
2008-03-08T00:00:00
[ [ "Seoanez", "C.", "" ], [ "Guinea", "F.", "" ], [ "Neto", "A. H. Castro", "" ] ]
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712.0754
Natalia Babych
N. Babych and Yu. Golovaty
Asymptotic analysis of vibrating system containing stiff-heavy and flexible-light parts
16 pages
null
null
null
math.SP
null
A model of strongly inhomogeneous medium with simultaneous perturbation of rigidity and mass density is studied. The medium has strongly contrasting physical characteristics in two parts with the ratio of rigidities being proportional to a small parameter $\epsilon$. Additionally, the ratio of mass densities is of order $\epsilon^{-1}$. We investigate the asymptotic behaviour of spectrum and eigensubspaces as $\epsilon\to 0$. Complete asymptotic expansions of eigenvalues and eigenfunctions are constructed and justified. We show that the limit operator is nonself-adjoint in general and possesses two-dimensional Jordan cells in spite of the singular perturbed problem is associated with a self-adjoint operator in appropriated Hilbert space $L_\epsilon$. This may happen if the metric in which the problem is self-adjoint depends on small parameter $\epsilon$ in a singular way. In particular, it leads to a loss of completeness for the eigenfunction collection. We describe how root spaces of the limit operator approximate eigenspaces of the perturbed operator.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 15:47:56 GMT" } ]
2007-12-06T00:00:00
[ [ "Babych", "N.", "" ], [ "Golovaty", "Yu.", "" ] ]
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712.0755
Isabella Pagano
C. De Martino, L. Bianchi, I. Pagano, J. Herald, and D. Thilker
GALEX Ultraviolet photometry of NGC 2420: searching for WDs
null
null
null
null
astro-ph
null
We present color-magnitude diagrams of the open cluster NGC 2420, obtained from Galaxy Evolution Explorer (GALEX) ultraviolet images in FUV and NUV bands and Sloan Digital Sky Survey (SDSS) u,g,r,i,z photometry. Our goal is to search for and characterize hot evolved stars and peculiar objects in this open cluster, as part of a larger project aimed to study a number of open clusters in the Milky Way with GALEX and ground-based data.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 15:49:18 GMT" } ]
2007-12-06T00:00:00
[ [ "De Martino", "C.", "" ], [ "Bianchi", "L.", "" ], [ "Pagano", "I.", "" ], [ "Herald", "J.", "" ], [ "Thilker", "D.", "" ] ]
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712.0756
Amy Winebarger
A.R Winebarger, H.P. Warren, and D.A. Falconer
Modeling X-ray Loops and EUV "Moss" in an Active Region Core
17 pages, 6 figurs, accepted to ApJ
null
10.1086/527291
null
astro-ph
null
The Soft X-ray intensity of loops in active region cores and corresponding footpoint, or moss, intensity observed in the EUV remain steady for several hours of observation. The steadiness of the emission has prompted many to suggest that the heating in these loops must also be steady, though no direct comparison between the observed X-ray and EUV intensities and the steady heating solutions of the hydrodynamic equations has yet been made. In this paper, we perform these simulations and simultaneously model the X-Ray and EUV moss intensities in one active regioncore with steady uniform heating. To perform this task, we introduce a new technique to constrain the model parameters using the measured EUV footpoint intensity to infer a heating rate. We find that a filling factor of 8% and loops that expand with height provides the best agreement with the intensity in two X-ray filters, though the simulated SXT Al12 intensity is 147% the observed intensity and the SXT AlMg intensity is 80% the observed intensity. From this solution, we determine the required heating rate scales as ${\bar{B}}^{0.29} L^{-0.95}$. Finally we discuss the future potential of this type of modeling, such as the ability to use density measurements to fully constrain filling factor, and its shortcomings, such as the requirement to use potential field extrapolations to approximate the coronal field.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 15:52:45 GMT" } ]
2009-11-13T00:00:00
[ [ "Winebarger", "A. R", "" ], [ "Warren", "H. P.", "" ], [ "Falconer", "D. A.", "" ] ]
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712.0757
Sonja Koller
Ralph Peter Hornberger, Sonja Koller, Georg Begemann, Andrea Donarini, Milena Grifoni
Transport through a double quantum dot system with non-collinearly polarized leads
18 pages, 13 figures, 5 tables; revised published version
Phys. Rev. B 77, 245313 (2008)
10.1103/PhysRevB.77.245313
null
cond-mat.mes-hall
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We investigate linear and non-linear transport in a double quantum dot system weakly coupled to spin-polarized leads. In the linear regime, the conductance as well as the non-equilibrium spin accumulation are evaluated in analytic form. The conductance as a function of the gate voltage exhibits four peaks of different height, with mirror symmetry with respect to the charge neutrality point. As the polarization angle is varied, the position and shape of the peaks changes in a characteristic way which preserves the electron-hole symmetry of the problem. In the nonlinear regime negative differential conductance features occur for non collinear magnetisations of the leads. In the considered sequential tunneling limit, the tunneling magneto resistance (TMR) is always positive with a characteristic gate voltage dependence for non-collinear magnetization. If a magnetic field is added to the system, the TMR can become negative.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 16:14:46 GMT" }, { "version": "v2", "created": "Mon, 17 Dec 2007 10:08:22 GMT" }, { "version": "v3", "created": "Tue, 1 Jul 2008 10:02:31 GMT" } ]
2008-07-01T00:00:00
[ [ "Hornberger", "Ralph Peter", "" ], [ "Koller", "Sonja", "" ], [ "Begemann", "Georg", "" ], [ "Donarini", "Andrea", "" ], [ "Grifoni", "Milena", "" ] ]
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712.0758
Sang-Koog Kim
Ki-Suk Lee, and Sang-Koog Kim
Two Circular-Rotational Eigenmodes in Vortex Gyrotropic Motions in Soft Magnetic Nanodots
30 pages, 7 figures
Phys. Rev. B 78, 014405 (2008) (6 pages)
10.1103/PhysRevB.78.014405
null
cond-mat.mtrl-sci cond-mat.other
null
We found, by micromagnetic numerical and analytical calculations, that the clockwise (CW) and counterclockwise (CCW) circular-rotational motions of a magnetic vortex core in a soft magnetic circular nanodot are the elementary eigenmodes existing in the gyrotropic motion with respect to the corresponding CW and CCW circular-rotational-field eigenbasis. Any steady-state vortex gyrotropic motions driven by a linearly polarized oscillating in-plane magnetic field in the linear regime can be perfectly understood according to the superposition of the two circular eigenmodes, which show asymmetric resonance characteristics reflecting the vortex polarization. The relative magnitudes in the amplitude and phase between the CCW and CW eigenmodes determine the elongation and orientation of the orbital trajectories of the vortex core motions, respectively, which trajectories vary with the polarization and chirality of the given vortex as well as the field frequency across the resonance frequency.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 15:56:47 GMT" }, { "version": "v2", "created": "Tue, 15 Jan 2008 11:57:07 GMT" }, { "version": "v3", "created": "Fri, 1 Feb 2008 14:47:35 GMT" } ]
2008-07-05T00:00:00
[ [ "Lee", "Ki-Suk", "" ], [ "Kim", "Sang-Koog", "" ] ]
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712.0759
Luis L. Sanchez. Soto
A. B. Klimov, J. L. Romero, L. L. Sanchez-Soto, A. Messina and A. Napoli
Quantum light depolarization: the phase-space perspective
6 pages, no figures. Submitted for publication
Phys. Rev. A 77, 033853 (2008)
10.1103/PhysRevA.77.033853
null
quant-ph
null
Quantum light depolarization is handled through a master equation obtained by coupling dispersively the field to a randomly distributed atomic reservoir. This master equation is solved by transforming it into a quasiprobability distribution in phase space and the quasiclassical limit is investigated.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 15:59:09 GMT" } ]
2008-07-25T00:00:00
[ [ "Klimov", "A. B.", "" ], [ "Romero", "J. L.", "" ], [ "Sanchez-Soto", "L. L.", "" ], [ "Messina", "A.", "" ], [ "Napoli", "A.", "" ] ]
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712.076
Verena Koerting
V. Koerting, J. Paaske, and P. W\"olfle
Electron transport in the four-lead two-impurity Kondo model: Nonequilibrium perturbation theory with almost degenerate levels
10 pages, 8 figures
Phys. Rev. B 77, 165122 (2008) (10 pages)
10.1103/PhysRevB.77.165122
null
cond-mat.str-el
null
The eigenstates of an isolated nanostructure may get mixed by the coupling to external leads. This effect is the stronger, the smaller the level splitting on the dot and the larger the broadening induced by the coupling to the leads. We describe how to calculate the nondiagonal density matrix of the nanostructure efficiently in the cotunneling regime. As an example, we consider a system of two quantum dots in the Kondo regime, the two spins coupled by an antiferromagnetic exchange interaction and each dot tunnel coupled to two leads. Calculating the nonequilibrium density matrix and the corresponding current, we demonstrate the importance of the off-diagonal terms in the presence of an applied magnetic field and a finite bias voltage.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 16:25:39 GMT" }, { "version": "v2", "created": "Fri, 21 Dec 2007 14:28:06 GMT" }, { "version": "v3", "created": "Tue, 22 Apr 2008 08:00:11 GMT" } ]
2008-04-22T00:00:00
[ [ "Koerting", "V.", "" ], [ "Paaske", "J.", "" ], [ "Wölfle", "P.", "" ] ]
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712.0761
Seth Redfield
Seth Redfield, Michael Endl, William D. Cochran and Lars Koesterke
Sodium Absorption From the Exoplanetary Atmosphere of HD189733b Detected in the Optical Transmission Spectrum
12 pages, 2 figures; Accepted for publication in ApJ Letters
null
10.1086/527475
null
astro-ph
null
We present the first ground-based detection of sodium absorption in the transmission spectrum of an extrasolar planet. Absorption due to the atmosphere of the extrasolar planet HD189733b is detected in both lines of the NaI doublet. High spectral resolution observations were taken of eleven transits with the High Resolution Spectrograph (HRS) on the 9.2 meter Hobby-Eberly Telescope (HET). The NaI absorption in the transmission spectrum due to HD189733b is (-67.2 +/- 20.7) x 10^-5 deeper in the ``narrow'' spectral band that encompasses both lines relative to adjacent bands. The 1-sigma error includes both random and systematic errors, and the detection is >3-sigma. This amount of relative absorption in NaI for HD189733b is ~3x larger than detected for HD209458b by Charbonneau et al. (2002), and indicates these two hot-Jupiters may have significantly different atmospheric properties.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 20:21:33 GMT" } ]
2009-11-13T00:00:00
[ [ "Redfield", "Seth", "" ], [ "Endl", "Michael", "" ], [ "Cochran", "William D.", "" ], [ "Koesterke", "Lars", "" ] ]
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712.0762
Charles Bonatto
Eduardo Bica, Charles Bonatto and Denilso Camargo
Probing FSR star cluster candidates in bulge/disk directions with 2MASS colour-magnitude diagrams
13 pages; 10 figs. Accepted by MNRAS
MNRAS 2008
10.1111/j.1365-2966.2007.12812.x
null
astro-ph
null
We analyse 20 star cluster candidates projected mostly in the bulge direction ($|\ell|<60^\circ$). The sample contains all candidates in that sector classified by \citet{FSRcat} with quality flags denoting high probability of being star clusters. Bulge contamination in the colour-magnitude diagrams (CMDs) is in general important, while at lower Galactic latitudes disk stars contribute as well. Properties of the candidates are investigated with 2MASS CMDs and stellar radial density profiles (RDPs) built with field star decontaminated photometry. To uncover the nature of the structures we decontaminate the CMDs from field stars using tools that we previously developed to deal with objects in dense fields. We confirm in all cases excesses in the RDPs with respect to the background level, as expected from the method the candidates were originally selected. CMDs and RDPs taken together revealed 6 open clusters, 5 uncertain cases that require deeper observations, while 9 objects are possibly field density fluctuations.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 16:01:20 GMT" } ]
2012-04-02T00:00:00
[ [ "Bica", "Eduardo", "" ], [ "Bonatto", "Charles", "" ], [ "Camargo", "Denilso", "" ] ]
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712.0763
Lorenzo Marrucci
C. Manzo, D. Paparo, L. Marrucci, I. Janossy
Light-induced rotation of dye-doped liquid crystal droplets
null
Phys. Rev. E 73, 051707 (2006)
10.1103/PhysRevE.73.051707
null
physics.optics cond-mat.soft physics.flu-dyn
null
We investigate both theoretically and experimentally the rotational dynamics of micrometric droplets of dye-doped and pure liquid crystal induced by circularly and elliptically polarized laser light. The droplets are dispersed in water and trapped in the focus of the laser beam. Since the optical torque acting on the molecular director is known to be strongly enhanced in light-absorbing dye-doped materials, the question arises whether a similar enhancement takes place also for the overall optical torque acting on the whole droplets. We searched for such enhancement by measuring and comparing the rotation speed of dye-doped droplets induced by a laser beam having a wavelength either inside or outside the dye absorption band, and also comparing it with the rotation of pure liquid crystal droplets. No enhancement was found, confirming that photoinduced dye effects are only associated with an internal exchange of angular momentum between orientational and translational degrees of freedom of matter. Our result provides also the first direct experimental proof of the existence of a photoinduced stress tensor in the illuminated dye-doped liquid crystal. Finally, peculiar photoinduced dynamical effects are predicted to occur in droplets in which the molecular director is not rigidly locked to the flow, but so far they could not be observed.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 16:01:21 GMT" } ]
2007-12-06T00:00:00
[ [ "Manzo", "C.", "" ], [ "Paparo", "D.", "" ], [ "Marrucci", "L.", "" ], [ "Janossy", "I.", "" ] ]
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712.0764
Roopa Narayan
R. H. Narayan
The Conception of Atom in Greek and Indian Physics
4 pages, Presented at the 17th International Conference on Vedanta, Miami University, Oxford. September 2007
null
null
null
physics.gen-ph
null
This paper contrasts the Greek and Indian conceptions of atom. It is shown that these two are quite different in spirit.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 16:02:48 GMT" } ]
2007-12-06T00:00:00
[ [ "Narayan", "R. H.", "" ] ]
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712.0765
Cristina Bena
Cristina Bena, Gilles Montambaux
Remarks on the tight-binding model of graphene
15 pages, 4 figures
New J. Phys. 11, 095003 (2009)
10.1088/1367-2630/11/9/095003
null
cond-mat.mes-hall
null
We address a simple but fundamental issue arising in the study of graphene, as well as of other systems that have a crystalline structure with more than one atom per unit cell. For these systems, the choice of the tight-binding basis is not unique. For monolayer graphene two bases are widely used in the literature. While the expectation values of operators describing physical quantities should be independent of basis, the form of the operators may depend on the basis, especially in the presence of disorder or of an applied magnetic field. Using the inappropriate form of certain operators may lead to erroneous physical predictions. We discuss the two bases used to describe monolayer graphene, as well as the form of the most commonly used operators in the two bases. We repeat our analysis for the case of bilayer graphene.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 16:04:50 GMT" } ]
2010-04-15T00:00:00
[ [ "Bena", "Cristina", "" ], [ "Montambaux", "Gilles", "" ] ]
[ -0.0609208904, -0.0003089996, 0.1207021102, -0.0489024855, -0.0678107515, -0.0195817146, -0.0691576451, -0.0723694637, -0.0952665955, 0.0133652976, -0.069209449, -0.0526582375, 0.0504047871, 0.0360293202, 0.0037622277, -0.0100952033, -0.0475814976, 0.0371948965, 0.029243065, -0.0268601049, -0.0491096973, -0.0895682126, 0.0492133051, 0.0547562763, -0.0331283249, -0.1106522307, 0.0790003091, -0.0780678466, 0.0070906011, 0.0428673774, 0.0821085125, -0.008754788, -0.0800363794, -0.0989964455, -0.1663927734, 0.1089945212, 0.0019539625, 0.0403290093, -0.0279220752, 0.0381532609, -0.0124263596, -0.0006807301, -0.0762547255, 0.065013364, 0.0198536832, -0.0459496863, -0.0833517984, -0.0030191715, 0.0005220819, 0.0472188704, -0.0443955809, 0.0437480398, 0.0796737522, -0.0533575825, 0.0485916622, -0.0391375273, -0.0392670371, 0.024995178, 0.0621123724, -0.0032037215, -0.0132228378, -0.1003433391, -0.0244253408, 0.0821603164, -0.0921065882, -0.0119666038, -0.1294050962, 0.0142848091, -0.0046396493, 0.1075440198, -0.0738717616, 0.0105484836, 0.0323253721, 0.0853203312, 0.0037654655, -0.0848022923, 0.0739753693, -0.0044712876, -0.0248915721, 0.0340607874, -0.0197630282, -0.0571910404, 0.100861378, -0.0753740594, -0.0508710183, -0.0709189624, -0.040588025, -0.0261219051, -0.0679661632, -0.0787412897, 0.0027374902, -0.0154503882, -0.0371689983, 0.1372792274, 0.0569320247, 0.0205141772, 0.1122063398, -0.0849577039, -0.0034675954, -0.0891019851, 0.0531503707, 0.0070193713, -0.0376093276, -0.0292948671, 0.1440136731, 0.054911688, -0.090293467, -0.013727922, -0.1211165339, 0.053616602, -0.015618749, -0.0416758992, 0.0276112538, -0.0174448211, -0.0329988152, -0.0735091344, -0.0967170969, -0.0332837366, -0.0388785116, 0.0538238138, 0.0216797553, 0.0171210505, 0.1093053445, -0.0134430025, 0.0810724422, -0.0544972606, 0.0276630577, -0.0024606653, -0.1426667869, -0.0381791629, 0.0584343262, 0.0135336593, 0.0122320969, -0.0564139895, -0.0145697286, 0.0017483674, 0.0635110661, 0.0373503082, 0.1080620587, -0.0127242301, -0.0061419499, -0.1050056517, 0.0637182817, 0.094075121, -0.095473811, 0.0803989992, -0.0535129942, 0.0122515233, 0.0042252215, 0.0288286358, 0.0056465794, -0.0758920982, 0.0567248091, -0.0557923466, 0.0947485641, -0.191880092, 0.0962508619, 0.0356407948, 0.0559477583, 0.0099397926, 0.0379460491, 0.1149001196, -0.0329211093, -0.0056886696, 0.0452244394, 0.0694166645, -0.1627665311, -0.039292939, -0.0073431432, -0.1068187729, 0.0185974482, -0.0192320421, -0.0731983185, -0.0267305952, 0.0272745322, -0.0047432561, -0.0392670371, -0.0317296311, -0.035537187, -0.0462864079, 0.0210581142, -0.0229618922, 0.0543418489, -0.0793629289, 0.0060351053, -0.0274817459, -0.0196464695, 0.0315224156, -0.0170821976, -0.0520365946, -0.0611799099, 0.1371756196, 0.1291978806, 0.1536491215, -0.0584861301, -0.0672409162, 0.087288864, 0.0529172532, -0.0117529146, 0.0226640217, 0.002350583, 0.0108852061, 0.0324289799, -0.0559477583, -0.0861491859, 0.0207731947, -0.0291653592, -0.0120507842, -0.0649097562, 0.0572946481, 0.0051350198, -0.0335945562, -0.0054814555, -0.028051585, -0.0744415969, 0.0242958311, -0.0425047539, -0.0246843584, -0.0468303449, 0.0778088272, -0.0255261641, -0.0253319014, 0.0328175053, 0.1466038525, -0.0262773149, -0.0142589081, 0.0475037917, -0.0455870628, -0.0110341413, -0.0163051449, 0.0859937742, -0.00346112, 0.0713333935, -0.0652205795, 0.0147769423, 0.0199831929, 0.0124069331, -0.001558961, -0.0587451458, -0.0711261779, -0.0093958564, 0.0329988152, -0.066153042, -0.0063426886, 0.0239720605, 0.0179628562, -0.0678625554, -0.0265104305, 0.1017938405, 0.074130781, -0.0527359433, 0.1216345727, -0.0387231, 0.1309591979, -0.0878068954, -0.0714888051 ]
712.0766
Jean-Francois Gonzalez
Jean-Fran\c{c}ois Gonzalez (CRAL), Laure Fouchet (ETHZ), Sarah T. Maddison, Guillaume Laibe (CRAL)
Dust evolution in protoplanetary disks
6 pages, 5 figures, to appear in the Proceedings of IAU Symp. 249: Exoplanets: Detection, Formation and Dynamics (Suzhou, China)
Dans Proceedings of IAU Symp. 249 - Exoplanets: Detection, Formation and Dynamics, Suzhou : Chine (2007)
10.1017/S1743921308016840
null
astro-ph
null
We investigate the behaviour of dust in protoplanetary disks under the action of gas drag using our 3D, two-fluid (gas+dust) SPH code. We present the evolution of the dust spatial distribution in global simulations of planetless disks as well as of disks containing an already formed planet. The resulting dust structures vary strongly with particle size and planetary gaps are much sharper than in the gas phase, making them easier to detect with ALMA than anticipated. We also find that there is a range of masses where a planet can open a gap in the dust layer whereas it doesn't in the gas disk. Our dust distributions are fed to the radiative transfer code MCFOST to compute synthetic images, in order to derive constraints on the settling and growth of dust grains in observed disks.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 16:12:47 GMT" }, { "version": "v2", "created": "Thu, 10 Jan 2008 08:03:57 GMT" } ]
2009-11-13T00:00:00
[ [ "Gonzalez", "Jean-François", "", "CRAL" ], [ "Fouchet", "Laure", "", "ETHZ" ], [ "Maddison", "Sarah T.", "", "CRAL" ], [ "Laibe", "Guillaume", "", "CRAL" ] ]
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712.0767
Tim Sluckin
V.O. Kubytskyi, V.Y. Reshetnyak, T.J. Sluckin, S.J. Cox
Surface-mediated non-linear optical effects in liquid crystals
13 figures +latex file + bbl file in winzip file
null
null
null
cond-mat.soft
null
We make a phenomenological model of optical two-beam interaction in a model planar liquid crystal cell. The liquid crystal is subject to homeotropic anchoring at the cell walls, is surrounded by thin photosensitive layers, and is subject to a variable potential across the cell. These systems are often known as liquid crystal photorefractive systems. The interference between the two obliquely incident beams causes a time-independent periodic modulation in electric field intensity in the direction transverse to the cell normal. Our model includes this field phenomenologically by affecting the potential at the walls of the cell. The transverse periodic surface potential causes spatially periodic departures from a pure homeotropic texture. The texture modulation acts as a grating for the incident light. The incident light is both directly transmitted and also subject to diffraction. The first diffracted beams result in energy exchange between the beams. We find that the degree of energy exchange can be strongly sensitive to the mean angle of incidence, the angle between the beams, and the imposed potential across the cell. We use the model to speculate about what factors optimize non-linear optical interaction in liquid crystalline photorefractive systems.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 16:14:07 GMT" } ]
2007-12-06T00:00:00
[ [ "Kubytskyi", "V. O.", "" ], [ "Reshetnyak", "V. Y.", "" ], [ "Sluckin", "T. J.", "" ], [ "Cox", "S. J.", "" ] ]
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712.0768
C. A. Dominguez
Cesareo A. Dominguez, Nasrallah F. Nasrallah, Raoul R\"ontsch, Karl Schilcher
Strange quark mass from Finite Energy QCD sum rules to five loops
Additional comments added at the end of the Conclusions, and one extra reference is given. A note added in proof uses the most recent determination of Lambda_QCD from ALEPH to narrow down the prediction
JHEP 0805:020,2008
10.1088/1126-6708/2008/05/020
UCT-TP-270/07, MZ-TH/07-18
hep-ph hep-lat
null
The strange quark mass is determined from a new QCD Finite Energy Sum Rule (FESR) optimized to reduce considerably the systematic uncertainties arising from the hadronic resonance sector. As a result, the main uncertainty in this determination is due to the value of $\Lambda_{QCD}$. The correlator of axial-vector divergences is used in perturbative QCD to five-loop order, including quark and gluon condensate contributions, in the framework of both Fixed Order (FOPT), and Contour Improved Perturbation Theory (CIPT). The latter exhibits very good convergence, leading to a remarkably stable result in the very wide range $s_0 = 1.0 - 4.0 {GeV}^2$, where $s_0$ is the radius of the integration contour in the complex energy (squared) plane. The value of the strange quark mass in this framework at a scale of 2 GeV is $m_s(2 {GeV}) = 95 \pm 5 (111 \pm 6) {MeV}$ for $\Lambda_{QCD} = 420 (330) {MeV}$, respectively.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 16:14:56 GMT" }, { "version": "v2", "created": "Thu, 6 Dec 2007 10:23:28 GMT" }, { "version": "v3", "created": "Wed, 20 Feb 2008 10:49:46 GMT" }, { "version": "v4", "created": "Tue, 6 May 2008 15:42:47 GMT" } ]
2009-01-06T00:00:00
[ [ "Dominguez", "Cesareo A.", "" ], [ "Nasrallah", "Nasrallah F.", "" ], [ "Röntsch", "Raoul", "" ], [ "Schilcher", "Karl", "" ] ]
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712.0769
Jocelyne Troccaz
Michael Baumann (TIMC), Pierre Mozer (TIMC), Vincent Daanen (TIMC), Jocelyne Troccaz (TIMC)
Towards 3D ultrasound image based soft tissue tracking: a transrectal ultrasound prostate image alignment system
null
Dans Proceedings of MICCAI 2007 - Medical Image Computing and Computer Assisted Interventions 2007, Brisbane : Australie (2007)
null
null
cs.OH physics.med-ph
null
The emergence of real-time 3D ultrasound (US) makes it possible to consider image-based tracking of subcutaneous soft tissue targets for computer guided diagnosis and therapy. We propose a 3D transrectal US based tracking system for precise prostate biopsy sample localisation. The aim is to improve sample distribution, to enable targeting of unsampled regions for repeated biopsies, and to make post-interventional quality controls possible. Since the patient is not immobilized, since the prostate is mobile and due to the fact that probe movements are only constrained by the rectum during biopsy acquisition, the tracking system must be able to estimate rigid transformations that are beyond the capture range of common image similarity measures. We propose a fast and robust multi-resolution attribute-vector registration approach that combines global and local optimization methods to solve this problem. Global optimization is performed on a probe movement model that reduces the dimensionality of the search space and thus renders optimization efficient. The method was tested on 237 prostate volumes acquired from 14 different patients for 3D to 3D and 3D to orthogonal 2D slices registration. The 3D-3D version of the algorithm converged correctly in 96.7% of all cases in 6.5s with an accuracy of 1.41mm (r.m.s.) and 3.84mm (max). The 3D to slices method yielded a success rate of 88.9% in 2.3s with an accuracy of 1.37mm (r.m.s.) and 4.3mm (max).
[ { "version": "v1", "created": "Wed, 5 Dec 2007 16:15:58 GMT" } ]
2008-01-17T00:00:00
[ [ "Baumann", "Michael", "", "TIMC" ], [ "Mozer", "Pierre", "", "TIMC" ], [ "Daanen", "Vincent", "", "TIMC" ], [ "Troccaz", "Jocelyne", "", "TIMC" ] ]
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712.077
Chiara Camere
Chiara Camere
About the stability of the tangent bundle restricted to a curve
5 pages
null
null
null
math.AG
null
Let C be a smooth projective curve with genus g>1 and Clifford index c(C) and let L be a line bundle on C generated by its global sections. The morphism i:C -->P(H^0(L))=P is well-defined and i*T is the restriction to C of the tangent bundle T of the projective space P. Sharpening a theorem by Paranjape, we show that if deg L>2g-c(C)-1 then i*T is semi-stable, specifying when it is also stable. We then prove the existence on many curves of a line bundle L of degree 2g-c(C)-1 such that i*T is not semi-stable. Finally, we completely characterize the (semi-)stability of i*T when C is hyperelliptic.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 16:31:59 GMT" } ]
2007-12-06T00:00:00
[ [ "Camere", "Chiara", "" ] ]
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712.0771
Colin Folsom
C. P. Folsom, G. A. Wade, O. Kochukhov, E. Alecian, C. Catala, S. Bagnulo, J. D. Landstreet, D. A. Hanes
Magnetic, Chemical and Rotational Properties of the Herbig Ae/Be Binary System HD 72106
Proceedings of the CP#AP Workshop held in Vienna in September 2007
Contrib.Astron.Obs.Skalnate Pleso 38:245-250,2008
null
null
astro-ph
null
Recently, strong, globally-ordered magnetic fields have been detected in some Herbig Ae and Be (HAeBe) stars, suggesting a possible evolutionary connection to main sequence magnetic chemically peculiar Ap and Bp stars. We have undertaken a detailed study of the binary system HD 72106, which contains a B9 magnetic primary and a HAeBe secondary, using the ESPaDOnS spectropolarimeter mounted on the CFHT. A careful analysis of the very young primary reveals that it has an approximately dipolar magnetic field geometry, strong chemical peculiarities, and strong surface chemical abundance inhomogeneities. Thus the primary is very similar to an Ap/Bp star despite having completed less then 1.5% of its main sequence life, and possibly still being on the pre-main sequence. In contrast, a similar analysis of the secondary reveals solar chemical abundances and no magnetic field.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 16:21:07 GMT" } ]
2010-11-26T00:00:00
[ [ "Folsom", "C. P.", "" ], [ "Wade", "G. A.", "" ], [ "Kochukhov", "O.", "" ], [ "Alecian", "E.", "" ], [ "Catala", "C.", "" ], [ "Bagnulo", "S.", "" ], [ "Landstreet", "J. D.", "" ], [ "Hanes", "D. A.", "" ] ]
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712.0772
Jean-Francois Gonzalez
Guillaume Laibe (CRAL), Jean-Fran\c{c}ois Gonzalez (CRAL), Laure Fouchet (ETHZ), Sarah T. Maddison
3D SPH simulations of grain growth in protoplanetary disks
3 pages, 3 figures, to appear in the Proceedings of IAU Symp. 249: Exoplanets: Detection, Formation and Dynamics (Suzhou, China)
Dans Proceedings of IAU Symp. 249 - Exoplanets: Detection, Formation and Dynamics, Suzhou : Chine (2007)
10.1017/S1743921308016864
Suzhou-221007
astro-ph
null
We present the first results of the treatment of grain growth in our 3D, two-fluid (gas+dust) SPH code describing protoplanetary disks. We implement a scheme able to reproduce the variation of grain sizes caused by a variety of physical processes and test it with the analytical expression of grain growth given by Stepinski & Valageas (1997) in simulations of a typical T Tauri disk around a one solar mass star. The results are in agreement with a turbulent growing process and validate the method. We are now able to simulate the grain growth process in a protoplanetary disk given by a more realistic physical description, currently under development. We discuss the implications of the combined effect of grain growth and dust vertical settling and radial migration on subsequent planetesimal formation.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 16:25:23 GMT" }, { "version": "v2", "created": "Thu, 10 Jan 2008 08:02:14 GMT" } ]
2009-11-13T00:00:00
[ [ "Laibe", "Guillaume", "", "CRAL" ], [ "Gonzalez", "Jean-François", "", "CRAL" ], [ "Fouchet", "Laure", "", "ETHZ" ], [ "Maddison", "Sarah T.", "" ] ]
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712.0773
Neil Budko
Neil V. Budko
Influence of Absorbers on the Electromagnetic Radiation
2 pages
null
null
null
quant-ph
null
The phenomenon of the electromagnetic absorption by arbitrarily distributed discrete absorbers is analyzed from the photon point of view. It is shown that apart from the decrease in the intensity of the signal the net effect of absorption includes a relative increase in the photon bunching.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 16:31:13 GMT" } ]
2007-12-06T00:00:00
[ [ "Budko", "Neil V.", "" ] ]
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712.0774
M. N. Rebelo
Gustavo C. Branco, David Emmanuel-Costa, M. N. Rebelo and Probir Roy
Four Zero Neutrino Yukawa Textures in the Minimal Seesaw Framework
19 pages, no figures. To appear in Phys. Rev. D. One reference added, minor changes, mainly typo corrections
Phys.Rev.D77:053011,2008
10.1103/PhysRevD.77.053011
CERN-PH-TH/2007-217
hep-ph
null
We investigate, within the Type I seesaw framework, the physical implications of zero textures in the Yukawa couplings which generate the neutrino Dirac mass matrix $m_D$. It is shown that four is the maximal number of texture zeroes compatible with the observed leptonic mixing and the assumption that no neutrino mass vanishes. We classify all allowed four-zero textures of $m_D$ into two categories with three classes each. We show that the different classes, in general, admit CP violation both at low and high energies. We further present the constraints obtained for low energy physics in each case. The r\^ ole of these zero textures in establishing a connection between leptogenesis and low energy data is analysed in detail. It is shown that it is possible in all cases to completely specify the parameters relevant for leptogenesis in terms of light neutrino masses and leptonic mixing together with the unknown heavy neutrino masses.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 16:31:27 GMT" }, { "version": "v2", "created": "Fri, 7 Mar 2008 16:36:46 GMT" } ]
2008-11-26T00:00:00
[ [ "Branco", "Gustavo C.", "" ], [ "Emmanuel-Costa", "David", "" ], [ "Rebelo", "M. N.", "" ], [ "Roy", "Probir", "" ] ]
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712.0775
Sylvain Arlot
Sylvain Arlot, Gilles Blanchard, Etienne Roquain
Some nonasymptotic results on resampling in high dimension, I: Confidence regions, II: Multiple tests
Published in at http://dx.doi.org/10.1214/08-AOS667; http://dx.doi.org/10.1214/08-AOS668 the Annals of Statistics (http://www.imstat.org/aos/) by the Institute of Mathematical Statistics (http://www.imstat.org)
The Annals of Statistics 38, 1 (2010) 51-99
10.1214/08-AOS667; 10.1214/08-AOS668
IMS-AOS-AOS667; IMS-AOS-AOS668
math.ST stat.TH
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study generalized bootstrap confidence regions for the mean of a random vector whose coordinates have an unknown dependency structure. The random vector is supposed to be either Gaussian or to have a symmetric and bounded distribution. The dimensionality of the vector can possibly be much larger than the number of observations and we focus on a nonasymptotic control of the confidence level, following ideas inspired by recent results in learning theory. We consider two approaches, the first based on a concentration principle (valid for a large class of resampling weights) and the second on a resampled quantile, specifically using Rademacher weights. Several intermediate results established in the approach based on concentration principles are of interest in their own right. We also discuss the question of accuracy when using Monte Carlo approximations of the resampled quantities.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 16:38:59 GMT" }, { "version": "v2", "created": "Mon, 6 Jul 2009 09:30:13 GMT" }, { "version": "v3", "created": "Mon, 11 Jan 2010 10:31:49 GMT" } ]
2010-07-02T00:00:00
[ [ "Arlot", "Sylvain", "" ], [ "Blanchard", "Gilles", "" ], [ "Roquain", "Etienne", "" ] ]
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712.0776
Ronald Wilhelm Ph.D.
Ronald Wilhelm, W. Lee Powell Jr., Timothy C. Beers, Branimir Sesar, Carlos Alende Prieto, Kenneth W. Carrell, Young Sun Lee, Brian Yanny, Constance M. Rockosi, Nathan De Lee, Gwen Hansford Armstrong, Stephen J. Torrence
Identification of RR Lyrae Variables in SDSS from Single-Epoch Photometric and Spectroscopic Observations
59 pages, 17 figures, 8 tables
null
null
null
astro-ph
null
We describe a new RR Lyrae identification technique based on out-of-phase single-epoch photometric and spectroscopic observations contained in SDSS Data Release 6 (DR-6). This technique detects variability by exploiting the large disparity between the g-r color and the strength of the hydrogen Balmer lines when the two observations are made at random phases. Comparison with a large sample of known variables in the SDSS equatorial stripe (Stripe 82) shows that the discovery efficiency for our technique is ~85%. Analysis of stars with multiple spectroscopic observations suggests a similar efficiency throughout the entire DR-6 sample. We also develop a technique to estimate the average g apparent magnitude (over the pulsation cycle) for individual RR Lyrae stars, using the <g-r> for the entire sample and measured colors for each star. The resulting distances are found to have precisions of ~14%. Finally, we explore the properties of our DR-6 sample of N = 1087 variables, and recover portions of the Sagittarius Northern and Southern Stream. Analysis of the distance and velocity for the Southern Stream are consistent with previously published data for blue horizontal-branch stars. In a sample near the North Galactic Polar Cap, we find evidence for the descending leading Northern arm, and a possible detection of the trailing arm.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 17:32:50 GMT" } ]
2007-12-06T00:00:00
[ [ "Wilhelm", "Ronald", "" ], [ "Powell", "W. Lee", "Jr." ], [ "Beers", "Timothy C.", "" ], [ "Sesar", "Branimir", "" ], [ "Prieto", "Carlos Alende", "" ], [ "Carrell", "Kenneth W.", "" ], [ "Lee", "Young Sun", "" ], [ "Yanny", "Brian", "" ], [ "Rockosi", "Constance M.", "" ], [ "De Lee", "Nathan", "" ], [ "Armstrong", "Gwen Hansford", "" ], [ "Torrence", "Stephen J.", "" ] ]
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712.0777
Cristian Pisano
D. Boer, P.J. Mulders, C. Pisano
T-odd effects in photon-jet production at the Tevatron
9 pages, 3 figures; references and discussion added in Section II, matches final version to be published in Phys. Lett. B
Phys.Lett.B660:360-368,2008
10.1016/j.physletb.2008.01.021
null
hep-ph hep-ex
null
The angular distribution in photon-jet production in p \bar{p} -> \gamma jet X is studied within a generalized factorization scheme taking into account the transverse momentum of the partons in the initial hadrons. Within this scheme an anomalously large cos(2\phi) asymmetry observed in the Drell-Yan process could be attributed to the T-odd, spin and transverse momentum dependent parton distribution function h_1^{\perp q}(x, p_{\perp}^2). This same function is expected to produce a cos(2\phi) asymmetry in the photon-jet production cross section. We give the expression for this particular azimuthal asymmetry, which is estimated to be smaller than the Drell-Yan asymmetry but still of considerable size for Tevatron kinematics. This offers a new possibility to study T-odd effects at the Tevatron.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 16:58:48 GMT" }, { "version": "v2", "created": "Mon, 21 Jan 2008 16:02:51 GMT" } ]
2008-11-26T00:00:00
[ [ "Boer", "D.", "" ], [ "Mulders", "P. J.", "" ], [ "Pisano", "C.", "" ] ]
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712.0778
Lawrence M. Krauss
Katherine Jones-Smith, Lawrence M. Krauss, Harsh Mathur (Case Western Reserve University)
A Nearly Scale Invariant Spectrum of Gravitational Radiation from Global Phase Transitions
4 pages, PRL published version
Phys.Rev.Lett.100:131302,2008
10.1103/PhysRevLett.100.131302
null
astro-ph gr-qc hep-ph hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Using a large N sigma model approximation we explicitly calculate the power spectrum of gravitational waves arising from a global phase transition in the early universe and we confirm that it is scale invariant, implying an observation of such a spectrum may not be a unique feature of inflation. Moreover, the predicted amplitude can be over 3 orders of magnitude larger than the naive dimensional estimate, implying that even a transition that occurs after inflation may dominate in Cosmic Microwave Background polarization or other gravity wave signals.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 16:53:41 GMT" }, { "version": "v2", "created": "Tue, 24 Jun 2008 19:50:12 GMT" } ]
2008-11-26T00:00:00
[ [ "Jones-Smith", "Katherine", "", "Case Western\n Reserve University" ], [ "Krauss", "Lawrence M.", "", "Case Western\n Reserve University" ], [ "Mathur", "Harsh", "", "Case Western\n Reserve University" ] ]
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