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711.2508
Mukremin Kilic
Andrew Gould and Mukremin Kilic
Finding Planets Around White Dwarf Remnants of Massive Stars
ApJ Letters, accepted. Changes from version1 in sections 4 and 5
null
10.1086/527476
null
astro-ph
null
Planet frequency shows a strong positive correlation with host mass from the hydrogen-burning limit to M ~ 2Msun. No search has yet been conducted for planets of higher-mass hosts because all existing techniques are insensitive to these planets. We show that infrared observations of the white-dwarf (WD) remnants of massive stars 3Msun < M < 7Msun would be sensitive to these planets for reasons that are closely connected to the insensitivity of other methods. We identify 49 reasonably bright, young, massive WDs from the Palomar-Green survey and discuss methods for detecting planets and for distinguishing between planet and disk explanations for any excess flux observed. The young, bright, massive WD sample could be expanded by a factor 4-5 by surveying the remainder of the sky for bright UV-excess objects.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 21:43:58 GMT" }, { "version": "v2", "created": "Wed, 5 Dec 2007 18:02:02 GMT" } ]
2009-11-13T00:00:00
[ [ "Gould", "Andrew", "" ], [ "Kilic", "Mukremin", "" ] ]
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711.2509
Adrian Pope
Adrian C. Pope, Istv\'an Szapudi (IfA, Hawaii)
Shrinkage Estimation of the Power Spectrum Covariance Matrix
9 pages, 7 figures (1 new), MNRAS, accepted. Changes to match accepted version, including an additional explanatory section with 1 figure
null
10.1111/j.1365-2966.2008.13561.x
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We seek to improve estimates of the power spectrum covariance matrix from a limited number of simulations by employing a novel statistical technique known as shrinkage estimation. The shrinkage technique optimally combines an empirical estimate of the covariance with a model (the target) to minimize the total mean squared error compared to the true underlying covariance. We test this technique on N-body simulations and evaluate its performance by estimating cosmological parameters. Using a simple diagonal target, we show that the shrinkage estimator significantly outperforms both the empirical covariance and the target individually when using a small number of simulations. We find that reducing noise in the covariance estimate is essential for properly estimating the values of cosmological parameters as well as their confidence intervals. We extend our method to the jackknife covariance estimator and again find significant improvement, though simulations give better results. Even for thousands of simulations we still find evidence that our method improves estimation of the covariance matrix. Because our method is simple, requires negligible additional numerical effort, and produces superior results, we always advocate shrinkage estimation for the covariance of the power spectrum and other large-scale structure measurements when purely theoretical modeling of the covariance is insufficient.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 20:57:28 GMT" }, { "version": "v2", "created": "Tue, 22 Jul 2008 04:21:06 GMT" } ]
2009-11-13T00:00:00
[ [ "Pope", "Adrian C.", "", "IfA, Hawaii" ], [ "Szapudi", "István", "", "IfA, Hawaii" ] ]
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711.251
Alexander Scholz
Aleks Scholz (SUPA, University of St. Andrews), Ray Jayawardhana (University of Toronto)
Dusty disks at the bottom of the IMF
12 pages, 2 figures, accepted for publication in ApJL
null
10.1086/526340
null
astro-ph
null
'Isolated planetary mass objects' (IPMOs) have masses close to or below the Deuterium-burning mass limit (~15 Jupiter masses) -- at the bottom of the stellar initial mass function. We present an exploratory survey for disks in this mass regime, based on a dedicated observing campaign with the Spitzer Space Telescope. Our targets include the full sample of spectroscopically confirmed IPMOs in the Sigma Orionis cluster, a total of 18 sources. In the mass range 8... 20 MJup, we identify 4 objects with >3sigma colour excess at a wavelength of 8.0mu, interpreted as emission from dusty disks. We thus establish that a substantial fraction of IPMOs harbour disks with lifetimes of at least 2-4 Myr (the likely age of the cluster), indicating an origin from core collapse and fragmentation processes. The disk frequency in the IPMO sample is 29% (16-45%) at 8.0mu, very similar to what has been found for stars and brown dwarfs (~30%). The object SOri70, a candidate 3 MJup object in this cluster, shows IRAC colours in excess of the typical values for field T dwarfs (on a 2sigma level), possibly due to disk emission or low gravity. This is a new indication for youth and thus an extremely low mass for SOri70.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 21:01:27 GMT" } ]
2015-05-13T00:00:00
[ [ "Scholz", "Aleks", "", "SUPA, University of St. Andrews" ], [ "Jayawardhana", "Ray", "", "University of Toronto" ] ]
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711.2511
Christophe Grojean
C. Delaunay, C. Grojean and J.D. Wells
Dynamics of Non-renormalizable Electroweak Symmetry Breaking
33 pages, 8 figures
JHEP0804:029,2008
10.1088/1126-6708/2008/04/029
CERN-PH-TH/2007-219, MCTP-07-31, Saclay T07/141
hep-ph
null
We compute the complete one-loop finite temperature effective potential for electroweak symmetry breaking in the Standard Model with a Higgs potential supplemented by higher dimensional operators as generated for instance in composite Higgs and Little Higgs models. We detail the resolution of several issues that arise, such as the cancellation of infrared divergences at higher order and imaginary contributions to the potential. We follow the dynamics of the phase transition, including the nucleation of bubbles and the effects of supercooling. We characterize the region of parameter space consistent with a strong first-order phase transition which may be relevant to electroweak baryogenesis. Finally, we investigate the prospects of present and future gravity wave detectors to see the effects of a strong first-order electroweak phase transition.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 14:13:50 GMT" }, { "version": "v2", "created": "Fri, 18 Jan 2008 09:01:28 GMT" } ]
2008-11-26T00:00:00
[ [ "Delaunay", "C.", "" ], [ "Grojean", "C.", "" ], [ "Wells", "J. D.", "" ] ]
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711.2512
Mark Hertzberg
Mark P. Hertzberg (MIT), Shamit Kachru (Stanford), Washington Taylor (MIT), Max Tegmark (MIT)
Inflationary Constraints on Type IIA String Theory
22 pages, 1 figure; v3: Updated to match version published in JHEP, references added
JHEP 0712:095,2007
10.1088/1126-6708/2007/12/095
MIT-CTP-3905, SLAC-PUB-12999
hep-th astro-ph gr-qc
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We prove that inflation is forbidden in the most well understood class of semi-realistic type IIA string compactifications: Calabi-Yau compactifications with only standard NS-NS 3-form flux, R-R fluxes, D6-branes and O6-planes at large volume and small string coupling. With these ingredients, the first slow-roll parameter satisfies epsilon >= 27/13 whenever V > 0, ruling out both inflation (including brane/anti-brane inflation) and de Sitter vacua in this limit. Our proof is based on the dependence of the 4-dimensional potential on the volume and dilaton moduli in the presence of fluxes and branes. We also describe broader classes of IIA models which may include cosmologies with inflation and/or de Sitter vacua. The inclusion of extra ingredients, such as NS 5-branes and geometric or non-geometric NS-NS fluxes, evades the assumptions used in deriving the no-go theorem. We focus on NS 5-branes and outline how such ingredients may prove fruitful for cosmology, but we do not provide an explicit model. We contrast the results of our IIA analysis with the rather different situation in IIB.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 20:58:20 GMT" }, { "version": "v2", "created": "Tue, 27 Nov 2007 17:21:48 GMT" }, { "version": "v3", "created": "Fri, 18 Jul 2008 20:02:22 GMT" } ]
2009-10-07T00:00:00
[ [ "Hertzberg", "Mark P.", "", "MIT" ], [ "Kachru", "Shamit", "", "Stanford" ], [ "Taylor", "Washington", "", "MIT" ], [ "Tegmark", "Max", "", "MIT" ] ]
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711.2513
Yong-Seon Song
Yong-Seon Song (ICG/Portsmouth)
Large Scale Structure Formation of Normal Branch in DGP Brane World Model
6 pages, 2 figures
Phys.Rev.D77:124031,2008
10.1103/PhysRevD.77.124031
null
astro-ph
null
In this paper, we study the large scale structure formation of the normal branch in DGP model (Dvail, Gabadadze and Porrati brane world model) by applying the scaling method developed by Sawicki, Song and Hu for solving the coupled perturbed equations of motion of on-brane and off-brane. There is detectable departure of perturbed gravitational potential from LCDM even at the minimal deviation of the effective equation of state w_eff below -1. The modified perturbed gravitational potential weakens the integrated Sachs-Wolfe effect which is strengthened in the self-accelerating branch DGP model. Additionally, we discuss the validity of the scaling solution in the de Sitter limit at late times.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 21:03:39 GMT" }, { "version": "v2", "created": "Tue, 27 Nov 2007 08:52:51 GMT" } ]
2008-11-26T00:00:00
[ [ "Song", "Yong-Seon", "", "ICG/Portsmouth" ] ]
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711.2514
Jin-Ho Cho
Jin-Ho Cho and Soonkeon Nam
The Entropy Function for the Black Holes of Nariai Class
references added, compatible with the published version
JHEP0803:027,2008
10.1088/1126-6708/2008/03/027
null
hep-th
null
Based on the fact that the near horizon geometry of the extremal Schwarzschild-de Sitter black holes is Nariai geometry, we define the black holes of Nariai class as the configuration whose near-horizon geometry is factorized as two dimensional de Sitter space-time and some compact topology, that is Nariai geometry. We extend the entropy function formalism to the case of the black holes of Nariai class. The conventional entropy function (for the extremal black holes) is defined as Legendre transformation of Lagrangian density, thus the `Routhian density', over two dimensional anti-de Sitter. As for the black holes of Nariai class, it is defined as {\em minus} `Routhian density' over two dimensional de Sitter space-time. We found an exact agreement of the result with Bekenstein-Hawking entropy. The higher order corrections are nontrivial only when the space-time dimension is over four, that is, $d>4$. There is a subtlety as regards the temperature of the black holes of Nariai class. We show that in order to be consistent with the near horizon geometry, the temperature should be non-vanishing despite the extremality of the black holes.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 23:05:57 GMT" }, { "version": "v2", "created": "Mon, 10 Mar 2008 15:43:22 GMT" } ]
2008-11-26T00:00:00
[ [ "Cho", "Jin-Ho", "" ], [ "Nam", "Soonkeon", "" ] ]
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711.2515
Joseph A. Mu\~noz
Joseph A. Mu\~noz, Abraham Loeb
Light-Cone Distortion of the Clustering and Abundance of Massive Galaxies at High-Redshifts
8 pages, 7 figures, Accepted by MNRAS
null
10.1111/j.1365-2966.2008.13210.x
null
astro-ph
null
Observational surveys of galaxies are not trivially related to single-epoch snapshots from computer simulations. Observationally, an increase in the distance along the line-of-sight corresponds to an earlier cosmic time at which the properties of the surveyed galaxy population may change. The effect of observing a survey volume along the light-cone must be considered in the regime where the mass function of galaxies varies exponentially with redshift. This occurs when the halos under consideration are rare, that is either when they are very massive or observed at high-redshift. While the effect of the light-cone is negligible for narrow-band surveys of Lyman-alpha emitters, it can be significant for drop-out surveys of Lyman-break galaxies (LBGs) where the selection functions of the photometric bands are broad. Since there are exponentially more halos at the low-redshift end of the survey, the low-redshift tail of the selection function contains a disproportionate fraction of the galaxies observed in the survey. This leads to a redshift probability distribution (RPD) for the dropout LBGs with a mean less than that of the photometric selection function (PHSF) by an amount of order the standard deviation of the PHSF. The inferred mass function of galaxies is then shallower than the true mass function at a single redshift with the abundance at the high-mass end being twice or more as large as expected. Moreover, the statistical moments of the count of galaxies calculated ignoring the light-cone effect, deviate from the actual values.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 21:09:47 GMT" }, { "version": "v2", "created": "Thu, 13 Mar 2008 21:45:41 GMT" } ]
2009-11-13T00:00:00
[ [ "Muñoz", "Joseph A.", "" ], [ "Loeb", "Abraham", "" ] ]
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711.2516
Jing Shu
Jing Shu
Unitarity Bounds for New Physics from Axial Coupling at LHC
7 pages, 6 figures
Phys.Rev.D78:096004,2008
10.1103/PhysRevD.78.096004
EFI-07-30, ANL-HEP-PR-07-95
hep-ph
null
If a new massive vector boson with nonzero axial couplings to fermions will be observed at LHC, then an upper limit on the scale of new physics could be derived from unitarity of $\mathcal{S}$-matrix. The new physics will involve either new massive fermions, or scalars, or even a strongly coupled sector. We derive a model independent bound on the scale of new physics. If $M_{G}/ g_{A} < 3$ TeV and the fermion is a top quark, the upper limit is 78 TeV.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 21:19:07 GMT" } ]
2008-11-26T00:00:00
[ [ "Shu", "Jing", "" ] ]
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711.2517
Bin Luo
B. Luo, W. N. Brandt, A. T. Steffen, F. E. Bauer
Deep-Survey Constraints on X-ray Outbursts from Galactic Nuclei
28 pages, 12 figures. Accepted for publication in ApJ
null
10.1086/526509
null
astro-ph
null
Luminous X-ray outbursts with variability amplitudes as high as ~1000 have been detected from a small number of galactic nuclei. These events are likely associated with transient fueling of nuclear supermassive black holes. In this paper, we constrain X-ray outbursts with harder spectra, higher redshifts, and lower luminosities than have been studied previously. We performed a systematic survey of 24668 optical galaxies in the Chandra Deep Fields to search for such X-ray outbursts; the median redshift of these galaxies is ~0.8. The survey spans 798 days for the Chandra Deep Field-North, and 1828 days for the Chandra Deep Field-South. No outbursts were found, and thus we set upper limits on the rate of such events in the Universe, which depend upon the adopted outburst X-ray luminosity. For an outburst with X-ray luminosity $\ga 10^{43}$ ergs/s and a duration of 6 months, the upper limit on its event rate is ~10^{-4} /galaxy/yr, roughly consistent with theoretical predictions. Compared to previous survey results, our harder-band and deeper survey suggests that the outburst rate may increase by a maximum factor of 10 when considering both obscured X-ray outbursts and redshift evolution from z~0 to z~0.8. Our results also suggest that the X-ray luminosity function for moderate-luminosity active galactic nuclei is not primarily due to stellar tidal disruptions.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 21:20:39 GMT" } ]
2009-11-13T00:00:00
[ [ "Luo", "B.", "" ], [ "Brandt", "W. N.", "" ], [ "Steffen", "A. T.", "" ], [ "Bauer", "F. E.", "" ] ]
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711.2518
Eytan Katzav
E Katzav and M Adda-Bedia
The spectrum of large powers of the Laplacian in bounded domains
13 pages, 2 figures
J. Phys. A: Math. Theor. 41 (2008) 022002
10.1088/1751-8113/41/2/022002
null
cond-mat.stat-mech cond-mat.dis-nn cond-mat.other cond-mat.soft math-ph math.MP nlin.SI
null
We present exact results for the spectrum of the Nth power of the Laplacian in a bounded domain. We begin with the one dimensional case and show that the whole spectrum can be obtained in the limit of large N. We also show that it is a useful numerical approach valid for any N. Finally, we discuss implications of this work and present its possible extensions for non integer N and for 3D Laplacian problems.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 21:25:08 GMT" } ]
2016-09-08T00:00:00
[ [ "Katzav", "E", "" ], [ "Adda-Bedia", "M", "" ] ]
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711.2519
Jing Shu
Jing Shu
Spontaneous Lorentz Violation and Baryogenesis
Contributed to 4th Meeting on CPT and Lorentz Symmetry (CPT 07), Bloomington, Indiana, August 8-11. References added for the new version
null
10.1142/9789812779519_0037
ANL-HEP-CP-07-103, EFI-07-34
hep-ph
null
In the presence of background fields that spontaneously violate Lorentz invariance, a matter-antimatter asymmetry can be generated even in thermal equilibrium. In this paper we systematically investigate models of this type, showing that either high-energy or electroweak versions of baryogenesis are possible, depending on the dynamics of the Lorentz-violating fields. We identify two scenarios of interest: baryogenesis from a weak-scale pseudo-Nambu-Goldstone boson with intermediate-scale baryon-number violation, and sphaleron-induced baryogenesis driven by a constant-magnitude vector with a late-time phase transition.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 21:32:04 GMT" }, { "version": "v2", "created": "Tue, 18 Dec 2007 22:08:24 GMT" } ]
2016-11-09T00:00:00
[ [ "Shu", "Jing", "" ] ]
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711.252
Edoardo Airoldi
Edoardo M Airoldi, Stephen E Fienberg, Eric P Xing
Mixed membership analysis of genome-wide expression data
22 pages, 4 figures
null
null
null
q-bio.QM q-bio.GN
null
Learning latent expression themes that best express complex patterns in a sample is a central problem in data mining and scientific research. For example, in computational biology we seek a set of salient gene expression themes that explain a biological process, extracting them from a large pool of gene expression profiles. In this paper, we introduce probabilistic models to learn such latent themes in an unsupervised fashion. Our models capture contagion, i.e., dependence among multiple occurrences of the same feature, using a hierarchical Bayesian scheme. Contagion is a convenient analytical formalism to characterize semantic themes underlying observed feature patterns, such as biological context. We present model variants tailored to different properties of biological data, and we outline a general variational inference scheme for approximate posterior inference. We validate our methods on both simulated data and realistic high-throughput gene expression profiles via SAGE. Our results show improved predictions of gene functions over existing methods based on stronger independence assumptions, and demonstrate feasibility of a promising hierarchical Bayesian formalism for soft clustering and latent aspects analysis.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 21:36:46 GMT" } ]
2007-11-19T00:00:00
[ [ "Airoldi", "Edoardo M", "" ], [ "Fienberg", "Stephen E", "" ], [ "Xing", "Eric P", "" ] ]
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711.2521
Takahiko Matsubara
Takahiko Matsubara
Resumming Cosmological Perturbations via the Lagrangian Picture: One-loop Results in Real Space and in Redshift Space
18 pages, 12 figures, replaced to match the published version
Phys.Rev.D77:063530,2008
10.1103/PhysRevD.77.063530
null
astro-ph
null
We develop a new approach to study the nonlinear evolution in the large-scale structure of the Universe both in real space and in redshift space, extending the standard perturbation theory of gravitational instability. Infinite series of terms in standard Eulerian perturbation theory are resummed as a result of our starting from a Lagrangian description of perturbations. Delicate nonlinear effects on scales of the baryon acoustic oscillations are more accurately described by our method than the standard one. Our approach differs from other resummation techniques recently proposed, such as the renormalized perturbation theory, etc., in that we use simple techniques and thus resulting equations are undemanding to evaluate, and in that our approach is capable of quantifying the nonlinear effects in redshift space. The power spectrum and correlation function of our approach are in good agreement with numerical simulations in literature on scales of baryon acoustic oscillations. Especially, nonlinear effects on the baryon acoustic peak of the correlation function are accurately described both in real space and in redshift space. Our approach provides a unique opportunity to analytically investigate the nonlinear effects on baryon acoustic scales in observable redshift space, which is requisite in constraining the nature of dark energy, the curvature of the Universe, etc., by redshift surveys.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 22:06:04 GMT" }, { "version": "v2", "created": "Wed, 20 Feb 2008 04:29:26 GMT" }, { "version": "v3", "created": "Fri, 4 Apr 2008 01:16:41 GMT" } ]
2008-11-26T00:00:00
[ [ "Matsubara", "Takahiko", "" ] ]
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711.2522
Meinolf Geck
Meinolf Geck
On Iwahori--Hecke algebras with unequal parameters and Lusztig's isomorphism theorem
final version; some minor corrections, including change of title (old title: "Remarks on Iwahori--Hecke algebras with unequal parameters"). To appear in "Pure and Applied Mathematics Quaterly"
null
null
null
math.RT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
By Tits' deformation argument, a generic Iwahori--Hecke algebra $H$ associated to a finite Coxeter group $W$ is abstractly isomorphic to the group algebra of $W$. Lusztig has shown how one can construct an explicit isomorphism, provided that the Kazhdan--Lusztig basis of $H$ satisfies certain deep properties. If $W$ is crystallographic and $H$ is a one-parameter algebra, then these properties are known to hold thanks to a geometric interpretation. In this paper, we develop some new general methods for verifying these properties, and we do verify them for two-parameter algebras of type $I_2(m)$ and $F_4$ (where no geometric interpretation is available in general). Combined with previous work by Alvis, Bonnaf\'e, DuCloux, Iancu and the author, we can then extend Lusztig's construction of an explicit isomorphism to all types of $W$, without any restriction on the parameters of $H$.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 22:08:17 GMT" }, { "version": "v2", "created": "Tue, 26 Feb 2008 10:06:59 GMT" }, { "version": "v3", "created": "Thu, 6 Mar 2008 12:03:57 GMT" }, { "version": "v4", "created": "Thu, 5 Feb 2009 14:26:15 GMT" } ]
2009-02-05T00:00:00
[ [ "Geck", "Meinolf", "" ] ]
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711.2523
Gregory Rutter
G. M. Rutter, N. P. Guisinger, J. N. Crain, E. A. A. Jarvis, M. D. Stiles, T. Li, P. N. First, and J. A. Stroscio
Imaging the interface of epitaxial graphene with silicon carbide via scanning tunneling microscopy
18 pages, 5 figures
null
10.1103/PhysRevB.76.235416
null
cond-mat.mtrl-sci
null
Graphene grown epitaxially on SiC has been proposed as a material for carbon-based electronics. Understanding the interface between graphene and the SiC substrate will be important for future applications. We report the ability to image the interface structure beneath single-layer graphene using scanning tunneling microscopy. Such imaging is possible because the graphene appears transparent at energies of 1 eV above or below the Fermi energy. Our analysis of calculations based on density functional theory shows how this transparency arises from the electronic structure of a graphene layer on a SiC substrate.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 22:13:46 GMT" }, { "version": "v2", "created": "Mon, 19 Nov 2007 16:08:50 GMT" } ]
2009-11-13T00:00:00
[ [ "Rutter", "G. M.", "" ], [ "Guisinger", "N. P.", "" ], [ "Crain", "J. N.", "" ], [ "Jarvis", "E. A. A.", "" ], [ "Stiles", "M. D.", "" ], [ "Li", "T.", "" ], [ "First", "P. N.", "" ], [ "Stroscio", "J. A.", "" ] ]
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711.2524
Robert M. Konik
Fabian H. L. Essler, Robert M. Konik
Finite-temperature lineshapes in gapped quantum spin chains
4 pages, 2 figures; new version contains added references
Phys.Rev.B78:100403,2008
10.1103/PhysRevB.78.100403
null
cond-mat.str-el hep-th
null
We consider the finite-temperature dynamical structure factor (DSF) of gapped quantum spin chains such as the spin one Heisenberg model and the transverse field Ising model in the disordered phase. At zero temperature the DSF in these models is dominated by a delta-function line arising from the coherent propagation of single particle modes. Using methods of integrable quantum field theory we determine the evolution of the lineshape at low temperatures. We show that the line shape is in general asymmetric in energy and becomes Lorentzian only at temperatures far below the gap. We discuss the relevance of our results for the analysis of inelastic neutron scattering experiments on gapped spin chain systems such as CsNiCl_3 and YBaNiO_5.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 22:13:47 GMT" }, { "version": "v2", "created": "Wed, 5 Dec 2007 23:08:24 GMT" } ]
2008-11-26T00:00:00
[ [ "Essler", "Fabian H. L.", "" ], [ "Konik", "Robert M.", "" ] ]
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711.2525
Enrico Carlon
S. Weckx, E. Carlon, L. De Vuyst, P. Van Hummelen
Thermodynamic behavior of short oligonucleotides in microarray hybridizations can be described using Gibbs free energy in a nearest-neighbor model
32 pages on a single pdf file
J. Phys. Chem. B 111, 13583 (2007)
10.1021/jp075197x
null
q-bio.BM q-bio.QM
null
While designing oligonucleotide-based microarrays, cross-hybridization between surface-bound oligos and non-intended labeled targets is probably the most difficult parameter to predict. Although literature describes rules-of-thumb concerning oligo length, overall similarity, and continuous stretches, the final behavior is difficult to predict. The aim of this study was to investigate the effect of well-defined mismatches on hybridization specificity using CodeLink Activated Slides, and to study quantitatively the relation between hybridization intensity and Gibbs free energy (Delta G), taking the mismatches into account. Our data clearly showed a correlation between the hybridization intensity and Delta G of the oligos over three orders of magnitude for the hybridization intensity, which could be described by the Langmuir model. As Delta G was calculated according to the nearest-neighbor model, using values related to DNA hybridizations in solution, this study clearly shows that target-probe hybridizations on microarrays with a three-dimensional coating are in quantitative agreement with the corresponding reaction in solution. These results can be interesting for some practical applications. The correlation between intensity and Delta G can be used in quality control of microarray hybridizations by designing probes and corresponding RNA spikes with a range of Delta G values. Furthermore, this correlation might be of use to fine-tune oligonucleotide design algorithms in a way to improve the prediction of the influence of mismatching targets on microarray hybridizations.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 21:45:31 GMT" } ]
2007-12-09T00:00:00
[ [ "Weckx", "S.", "" ], [ "Carlon", "E.", "" ], [ "De Vuyst", "L.", "" ], [ "Van Hummelen", "P.", "" ] ]
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711.2526
Yuri A. Dabaghian
Yu. Dabaghian
Complexity of spectral sequences: semiclassical approach
17 pages, 6 figures
null
null
null
quant-ph
null
It has been long recognized that the task of semiclassical evaluation of quantum spectra for the classically nonintegrable systems is fundamentally more complex than for the classically integrable ones. Below it is argued that the quantum spectra of the chaotic systems can differ among themselves by level of their complexity.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 22:24:09 GMT" } ]
2007-11-19T00:00:00
[ [ "Dabaghian", "Yu.", "" ] ]
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711.2527
Alexander Beilinson
A. Beilinson
Remarks on topological algebras
null
null
null
null
math.QA
null
The note complements topological aspects of the theory of chiral algebras.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 22:25:26 GMT" } ]
2007-11-19T00:00:00
[ [ "Beilinson", "A.", "" ] ]
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711.2528
Ching-Yuan Huang
C.-Y. Huang, M. Pohl
Production of Neutrinos and Secondary Electrons in Cosmic Sources
21 Pages; 3 Figures; 1 Table; Astroparticle Physics Minor Revised
Astropart.Phys.29:282-289,2008
10.1016/j.astropartphys.2008.02.003
null
astro-ph
null
We study the individual contribution to secondary lepton production in hadronic interactions of cosmic rays (CRs) including resonances and heavier secondaries. For this purpose we use the same ethodology discussed earlier \cite{Huang07}, namely the Monte Carlo particle collision code DPMJET3.04 to determine the multiplicity spectra of various secondary particles with leptons as the final decay states, that result from inelastic collisions of cosmic-ray protons and Helium nuclei with the interstellar medium of standard composition. By combining the simulation results with parametric models for secondary particle (with resonances included) for incident cosmic-ray energies below a few GeV, where DPMJET appears unreliable, we thus derive production matrices for all stable secondary particles in cosmic-ray interactions with energies up to about 10 PeV. We apply the production matrices to calculate the radio synchrotron radiation of secondary electrons in a young shell-type SNR, RX J1713.7-3946, which is a measure of the age, the spectral index of hadronic cosmic rays, and most importantly the magnetic field strength. We find that the multi-mG fields recently invoked to explain the X-ray flux variations are unlikely to extend over a large fraction of the radio-emitting region, otherwise the spectrum of hadronic cosmic rays in the energy window 0.1-100 GeV must be unusually hard. We also use the production matrices to calculate the muon event rate in an IceCube-like detector that are induced by muon neutrinos from high-energy $\gamma$-ray sources such as RX J1713.7-3946, Vela Jr. and MGRO J2019+37. At muon energies of a few TeV, or in other word, about 10 TeV neutrino energy, an accumulation of data over about five to ten years would allow testing the hadronic origin of TeV $\gamma$-rays.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 22:33:00 GMT" }, { "version": "v2", "created": "Wed, 23 Jan 2008 21:10:07 GMT" } ]
2008-11-26T00:00:00
[ [ "Huang", "C. -Y.", "" ], [ "Pohl", "M.", "" ] ]
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711.2529
Pascal Paschos
David Tytler, Pascal Paschos, David Kirkman, Michael L. Norman, Tridivesh Jena
The Effect of Large-Scale Power on Simulated Spectra of the Lya forest
null
null
10.1111/j.1365-2966.2008.14196.x
null
astro-ph
null
We study the effects of box size on ENZO simulations of the intergalactic medium (IGM) at z = 2. We follow statistics of the cold dark matter (CDM) and the Lya absorption. We find that the larger boxes have fewer pixels with significant absorption (flux < 0.96) and more pixels in longer stretches with little or no absorption, and they have wider Lya lines. We trace these effect back to the additional power in larger boxes from longer wavelength modes. The IGM in our larger boxes is hotter, from increased pressure heating due to faster hydrodynamical infall. When we increase the photoheating in smaller boxes to compensate, their Lya statistics change to mimic those of a box of twice the size. Statistics converge towards their value in the largest (76.8 Mpc) box, except for the most common value of the CDM density which continues to rise. When we compare to errors with data, we find that our 76.8 Mpc box is larger than we need for the mean flux, barely large enough for the column density distribution and the power spectrum of the flux, and too small for the line widths. This box with 75 kpc cells has approximately the same mean flux as QSO spectra, but the Lya lines are too wide by 2.6 km/s, there are too few lines with log H I column densities > 10^17 cm^-2, and the power of the flux is too low by 20 - 50%, from small to large scales. Four times smaller cell size does not resolve these differences, nor do simple changes to the ultraviolet background that drives the H and He II ionization. It is hard to see how simulations using popular cosmological and astrophysical parameters can match Lyman-alpha forest data at z=2.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 01:49:11 GMT" }, { "version": "v2", "created": "Mon, 19 Nov 2007 08:03:16 GMT" }, { "version": "v3", "created": "Tue, 27 Nov 2007 21:12:57 GMT" }, { "version": "v4", "created": "Fri, 30 Nov 2007 18:39:21 GMT" } ]
2015-05-13T00:00:00
[ [ "Tytler", "David", "" ], [ "Paschos", "Pascal", "" ], [ "Kirkman", "David", "" ], [ "Norman", "Michael L.", "" ], [ "Jena", "Tridivesh", "" ] ]
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711.253
Andrzej Pigulski
A.Pigulski, G.Pojma\'nski
Beta Cephei stars in the ASAS-3 data. II. 103 new Beta Cephei stars and a discussion of low-frequency modes
30 pages, 26 figures, accepted for publication in Astronomy & Astrophysics
null
10.1051/0004-6361:20078581
null
astro-ph
null
We analysed ASAS-3 photometry of bright early-type stars with the goal of finding new Beta Cephei stars. We were particularly interested in stars that would be good for seismic analysis, i.e., stars that (i) have a large number of excited modes, (ii) show rotationally split modes, (iii) are components of eclipsing binary systems, (iv) have low-frequency modes, that is, are hybrid Beta Cephei/SPB stars. Our study was made with a homogeneous sample of over 4100 stars having MK spectral type B5 or earlier. For these stars, the ASAS-3 photometry was analysed by means of a Fourier periodogram. We have discovered 103 Beta Cephei stars, nearly doubling the number of previously known stars of this type. Among these stars, four are components of eclipsing binaries, seven have modes equidistant or nearly equidistant in frequency. In addition, we found five Beta Cephei stars that show low-frequency periodic variations, very likely due to pulsations. We therefore regard them as candidate hybrid Beta Cephei/SPB pulsators. All these stars are potentially very useful for seismic modeling. Moreover, we found Beta Cephei-type pulsations in three late O-type stars and fast period changes in one, HD 168050.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 22:47:05 GMT" } ]
2009-11-13T00:00:00
[ [ "Pigulski", "A.", "" ], [ "Pojmański", "G.", "" ] ]
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711.2531
Hendrik Blok
Michael Doebeli, Hendrik J. Blok, Olof Leimar, Ulf Dieckmann
Multimodal pattern formation in phenotype distributions of sexual populations
null
Proc. R. Soc. B (2007) 274, 347-357
10.1098/rspb.2006.3725
null
q-bio.PE
null
During bouts of evolutionary diversification, such as adaptive radiations, the emerging species cluster around different locations in phenotype space, How such multimodal patterns in phenotype space can emerge from a single ancestral species is a fundamental question in biology. Frequency-dependent competition is one potential mechanism for such pattern formation, as has previously been shown in models based on the theory of adaptive dynamics. Here we demonstrate that also in models similar to those used in quantitative genetics, phenotype distributions can split into multiple modes under the force of frequency-dependent competition. In sexual populations, this requires assortative mating, and we show that the multimodal splitting of initially unimodal distributions occurs over a range of assortment parameters. In addition, assortative mating can be favoured evolutionarily even if it incurs costs, because it provides a means of alleviating the effects of frequency dependence. Our results reveal that models at both ends of the spectrum between essentially monomorphic (adaptive dynamics) and fully polymorphic (quantitative genetics) yield similar results. This underscores that frequency-dependent selection is a strong agent of pattern formation in phenotype distributions, potentially resulting in adaptive speciation.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 23:25:00 GMT" } ]
2007-11-19T00:00:00
[ [ "Doebeli", "Michael", "" ], [ "Blok", "Hendrik J.", "" ], [ "Leimar", "Olof", "" ], [ "Dieckmann", "Ulf", "" ] ]
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711.2532
Kathrin Bringmann
Kathrin Bringmann and Bernhard Heim
Hecke duality relations of Jacobi forms
17 pages
null
null
null
math.NT
null
In this paper we introduce a new subspace of Jacobi forms of higher degree via certain relations among Fourier coefficients. We prove that this space can also be characterized by duality properties of certain distinguished embedded Hecke operators. We then show that this space is Hecke invariant with respect to all good Hecke operators. As explicit examples we give Eisenstein series. Conversely we show the existence of forms that are not contained in this space.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 23:25:15 GMT" }, { "version": "v2", "created": "Tue, 4 Dec 2007 22:56:04 GMT" } ]
2007-12-05T00:00:00
[ [ "Bringmann", "Kathrin", "" ], [ "Heim", "Bernhard", "" ] ]
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711.2533
Jean-Francois Lafont
J.-F. Lafont, I. J. Ortiz
Splitting formulas for certain Waldhausen Nil-groups
12 pages
J. London Math. Soc. 79 (2009), pgs. 309-322
10.1112/jlms/jdn075
null
math.KT math.AT
null
For a group G that splits as an amalgamation of A and B over a common subgroup C, there is an associated Waldhausen Nil-group, measuring the "failure" of Mayer-Vietoris for algebraic K-theory. Assume that (1) the amalgamation is acylindrical, and (2) the groups A,B,G satisfy the Farrell-Jones isomorphism conjecture. Then we show that the Waldhausen Nil-group splits as a direct sum of Nil-groups associated to certain (explicitly describable) infinite virtually cyclic subgroups of G. We note that a special case of an acylindrical amalgamation includes any amalgamation over a finite group C.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 23:37:07 GMT" } ]
2014-02-26T00:00:00
[ [ "Lafont", "J. -F.", "" ], [ "Ortiz", "I. J.", "" ] ]
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711.2534
Radu Tatar
Radu Tatar and Ben Wetenhall
SQCD Vacua and Geometrical Engineering
21 Pages, Latex, 8 Figures
Phys.Rev.D77:046007,2008
10.1103/PhysRevD.77.046007
LTH/775
hep-th
null
We consider the geometrical engineering constructions for the N = 1 SQCD vacua recently proposed by Giveon and Kutasov. After one T-duality, the geometries with wrapped D5 branes become N = 1 brane configurations with NS branes and D4 branes. The field theories encoded by the geometries contain extra massive adjoint fields for the flavor group. After performing a flop, the geometries contain branes, antibranes and branes wrapped on non-holomorphic cycles. The various tachyon condensations between pairs of wrapped D5 branes and anti D5 branes together with deformations of the cycles give rise to a variety of supersymmetric and metastable non-supersymmetric vacua.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 17:36:29 GMT" } ]
2008-11-26T00:00:00
[ [ "Tatar", "Radu", "" ], [ "Wetenhall", "Ben", "" ] ]
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711.2535
J.-P. Macquart
Jean-Pierre Macquart
Limits on the Detection of Transients Imposed by Scattering
The author has recognized an error in the section of the text regarding induced Compton scattering, and the paper has been withdrawn pending a revised version to be posted later
PoS Dynamic:022,2007
10.1063/1.2721243
null
astro-ph
null
The author has recognized an error in the section of the text regarding induced Compton scattering. The paper has been withdrawn pending a revision to this section.
[ { "version": "v1", "created": "Thu, 15 Nov 2007 23:40:00 GMT" }, { "version": "v2", "created": "Wed, 21 Nov 2007 05:13:34 GMT" } ]
2010-12-13T00:00:00
[ [ "Macquart", "Jean-Pierre", "" ] ]
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711.2536
Douglas Whittet
D.C.B. Whittet, J.H. Hough, A. Lazarian, Thiem Hoang
The Efficiency of Grain Alignment in Dense Interstellar Clouds: A Reassessment of Constraints from Near Infrared Polarization
null
Astrophys.J.674:304-315,2008
10.1086/525040
null
astro-ph
null
A detailed study of interstellar polarization efficiency toward molecular clouds is used to attempt discrimination between grain alignment mechanisms in dense regions of the ISM. Background field stars are used to probe polarization efficiency in quiescent regions of dark clouds, yielding a dependence on visual extinction well-represented by a power law. No significant change in this behavior is observed in the transition region between the diffuse outer layers and dense inner regions of clouds, where icy mantles are formed, and we conclude that mantle formation has little or no effect on the efficiency of grain alignment. Young stellar objects generally exhibit greater polarization efficiency compared with field stars at comparable extinctions, displaying enhancements by factors of up to 6. Of the proposed alignment mechanisms, that based on radiative torques appears best able to explain the data. The attenuated external radiation field accounts for the observed polarization in quiescent regions, and radiation from the embedded stars themselves may enhance alignment in the lines of sight to YSOs. Enhancements in polarization efficiency observed in the ice features toward several YSOs are of greatest significance, as they demonstrate efficient alignment in cold molecular clouds associated with star formation.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 00:00:00 GMT" } ]
2008-11-26T00:00:00
[ [ "Whittet", "D. C. B.", "" ], [ "Hough", "J. H.", "" ], [ "Lazarian", "A.", "" ], [ "Hoang", "Thiem", "" ] ]
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711.2537
Quinn Minor
Quinn E. Minor, Manoj Kaplinghat
Effects of galaxy-halo alignment and adiabatic contraction on gravitational lens statistics
10 pages, 7 figures
null
10.1111/j.1365-2966.2008.13777.x
null
astro-ph
null
We study the strong gravitational lens statistics of triaxial cold dark matter (CDM) halos occupied by central early-type galaxies. We calculate the image separation distribution for double, cusp and quad configurations. The ratios of image multiplicities at large separations are consistent with the triaxial NFW model, and at small separations are consistent with the singular isothermal ellipsoid (SIE) model. At all separations, the total lensing probability is enhanced by adiabatic contraction. If no adiabatic contraction is assumed, naked cusp configurations become dominant at approximately 2.5'', which is inconsistent with the data. We also show that at small-to-moderate separations, the image multiplicities depend sensitively on the alignment of the shapes of the luminous and dark matter projected density profiles. In constrast to other properties that affect these ratios, the degree of alignment does not have a significant effect on the total lensing probability. These correlations may therefore be constrained by comparing the theoretical image separation distribution to a sufficiently large lens sample from future wide and deep sky surveys such as Pan-Starrs, LSST and JDEM. Understanding the correlations in the shapes of galaxies and their dark matter halo is important for future weak lensing surveys.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 20:41:24 GMT" } ]
2009-11-13T00:00:00
[ [ "Minor", "Quinn E.", "" ], [ "Kaplinghat", "Manoj", "" ] ]
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711.2538
Jeremy Schmit
Jeremy D. Schmit, Ercan Kamber, Jan\'e Kondev
Diffusion limited reactions in confined environments
4 pages, 3 figures
null
10.1103/PhysRevLett.102.218302
null
cond-mat.soft
null
We study the effect of confinement on diffusion limited bimolecular reactions within a lattice model where a small number of reactants diffuse amongst a much larger number of inert particles. When the number of inert particles is held constant the rate of the reaction is slow for small reaction volumes due to limited mobility from crowding, and for large reaction volumes due to the reduced concentration of the reactants. The reaction rate proceeds fastest at an intermediate confinement corresponding to volume fraction near 1/2 and 1/3 in two and three dimensions, respectively. We generalize the model to off-lattice systems with hydrodynamic coupling and predict that the optimal reaction rate for monodisperse colloidal systems occurs when the volume fraction is ~0.18. Finally, we discuss the application of our model to bimolecular reactions inside cells as well as the dynamics of confined polymers.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 00:40:24 GMT" }, { "version": "v2", "created": "Mon, 19 Nov 2007 19:30:12 GMT" } ]
2013-05-29T00:00:00
[ [ "Schmit", "Jeremy D.", "" ], [ "Kamber", "Ercan", "" ], [ "Kondev", "Jané", "" ] ]
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711.2539
Lixin He
Chenjie Wang, Guang-Can Guo, Lixin He
First-principles study of the lattice and electronic structures of TbMn$_2$O$_5$
12 pages, 5 figures
null
10.1103/PhysRevB.77.134113
null
cond-mat.mtrl-sci cond-mat.str-el
null
The structural, electronic and lattice dielectric properties of multiferroic TbMn$_2$O$_5$ are investigated using density functional theory within the generalized gradient approximation (GGA). We use collinear spin approximations and ignore the spin-orbit coupling. The calculated structural parameters are in excellent agreement with the experiments. We confirm that the ground state structure of TbMn$_2$O$_5$ is of space group $Pb2_1m$, allowing polarizations along the b-axis. The spontaneous electric polarization is calculated to be 1187 $nC\cdot$cm$^{-2}$. The calculated zone-center optical phonons frequencies and the oscillator strengths of IR phonons agree very well with the experimental values. We then derive an effective Hamiltonian to explain the magnetically-induced ferroelectricity in this compound. Our results strongly suggest that the ferroelectricity in TbMn$_2$O$_5$ is driven by the magnetic ordering that breaks the the inversion symmetry, without invoking the spin-orbit coupling.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 00:51:02 GMT" } ]
2009-11-13T00:00:00
[ [ "Wang", "Chenjie", "" ], [ "Guo", "Guang-Can", "" ], [ "He", "Lixin", "" ] ]
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711.254
Li Chen
L. Chen, J.L. Hou, J.L.Zhao and R. de Grijs
Open clusters: their kinematics and metellicities
7 pages, 4 figures, submitted to Proceeding of IAU Symposium No.248: "A Giant Step:from Milli- to Micro-arcsecond Astrometry"
null
10.1017/S1743921308019765
null
astro-ph
null
We review our work on Galactic open clusters in recent years, and introduce our proposed large program for the LOCS (LAMOST Open Cluster Survey). First, based on the most complete open clusters sample with metallicity, age and distance data as well as kinematic information, some preliminary statistical analysis regarding the spatial and metallicity distributions is presented. In particular, a radial abundance gradient of - 0.058$\pm$ 0.006 dex kpc$^{-1}$ was derived, and by dividing clusters into age groups we show that the disk abundance gradient was steeper in the past. Secondly, proper motions, membership probabilities, and velocity dispersions of stars in the regions of two very young open clusters are derived. Both clusters show clear evidence of mass segregation, which provides support for the ``primordial'' mass segregation scenarios. Based on the great advantages of the forthcoming LAMOST facility, we have proposed a detailed open cluster survey with LAMOST (the LOCS). The aim, feasibility, and the present development of the LOCS are briefly summarized.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 00:50:40 GMT" } ]
2009-11-13T00:00:00
[ [ "Chen", "L.", "" ], [ "Hou", "J. L.", "" ], [ "Zhao", "J. L.", "" ], [ "de Grijs", "R.", "" ] ]
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711.2541
Haibao Duan
Haibao Duan and Xuezhi Zhao
Schubert calculus and cohomology of Lie groups. Part I. 1-connected Lie groups
32 pages; 4 tables
null
null
null
math.AT math.AG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Let $G$ be a compact and $1$--connected Lie group with a maximal torus $T$. Based on Schubert calculus on the flag manifold $G/T$ [15] we construct the integral cohomology ring $H^{\ast}(G)$ uniformly for all $G$.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 00:51:57 GMT" }, { "version": "v10", "created": "Thu, 24 Mar 2011 08:58:25 GMT" }, { "version": "v11", "created": "Sun, 26 Aug 2012 10:21:04 GMT" }, { "version": "v12", "created": "Fri, 3 May 2013 03:02:31 GMT" }, { "version": "v13", "created": "Mon, 16 Sep 2013 23:57:10 GMT" }, { "version": "v14", "created": "Thu, 10 Sep 2015 07:56:04 GMT" }, { "version": "v2", "created": "Tue, 22 Jan 2008 01:35:40 GMT" }, { "version": "v3", "created": "Mon, 7 Apr 2008 00:46:24 GMT" }, { "version": "v4", "created": "Mon, 17 Nov 2008 00:25:46 GMT" }, { "version": "v5", "created": "Thu, 26 Mar 2009 03:02:36 GMT" }, { "version": "v6", "created": "Sun, 5 Apr 2009 08:23:36 GMT" }, { "version": "v7", "created": "Thu, 1 Apr 2010 06:46:20 GMT" }, { "version": "v8", "created": "Fri, 2 Apr 2010 07:39:06 GMT" }, { "version": "v9", "created": "Sun, 29 Aug 2010 02:52:22 GMT" } ]
2015-09-11T00:00:00
[ [ "Duan", "Haibao", "" ], [ "Zhao", "Xuezhi", "" ] ]
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711.2542
Duoje Jia
Duojie Jia
Abelian-Higgs Phase of SU(2) QCD and Glueball Energy
11 pages, no figures. Submitted to HEP & HP
null
10.1088/1674-1137/32/7/001
null
hep-th
null
It is shown that SU(2) QCD admits an dual Abelian-Higgs phase, with a Higgs vacuum type of type-II superconductor. This is done by using connection decomposition for the gluon field and the random-direction approximation. Using bag picture with soft wall, we presented a calculational procedure for glueball energy based on the recent proof for wall-vortices [Nucl. Phys. B 741(2006)1].
[ { "version": "v1", "created": "Fri, 16 Nov 2007 01:19:41 GMT" } ]
2015-05-13T00:00:00
[ [ "Jia", "Duojie", "" ] ]
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711.2543
Ramin Nowbakht Ghalati
R. N. Ghalati, D. G. C. McKeon
A Canonical Analysis of the First Order Einstein-Hilbert Action
null
null
null
UWO-TH-07/17
gr-qc hep-th
null
The Dirac constraint formalism is applied to the d(d>2) dimensional Einstein-Hilbert action when written in first order form, using the metric density and affine connection as independent fields. Field equations not involving time derivatives are not used to eliminate fields. Primary, secondary and tertiary constraints arise, leaving d(d-3) degrees of freedom in phase space. The Poisson Bracket algebra of these constraints is given.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 01:47:40 GMT" } ]
2007-11-19T00:00:00
[ [ "Ghalati", "R. N.", "" ], [ "McKeon", "D. G. C.", "" ] ]
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711.2544
Giovanni Gallavotti
Giovanni Gallavotti
Perturbation Theory
Review
null
null
FM 9-07
physics.class-ph
null
A review article on perturbation theory
[ { "version": "v1", "created": "Fri, 16 Nov 2007 02:01:13 GMT" } ]
2007-11-19T00:00:00
[ [ "Gallavotti", "Giovanni", "" ] ]
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711.2545
Gaurav Khanna
Jae-Hun Jung, Gaurav Khanna and Ian Nagle
A spectral collocation approximation for the radial-infall of a compact object into a Schwarzschild black hole
Accepted for publication in International Journal of Modern Physics C (IJMPC)
Int.J.Mod.Phys.C20:1827-1848,2009
10.1142/S012918310901476X
null
physics.comp-ph gr-qc
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The inhomogeneous Zerilli equation is solved in time-domain numerically with the Chebyshev spectral collocation method to investigate a radial-infall of the point particle towards a Schwarzschild black hole. Singular source terms due to the point particle appear in the equation in the form of the Dirac $\delta$-function and its derivative. For the approximation of singular source terms, we use the direct derivative projection method without any regularization. The gravitational waveforms are evaluated as a function of time. We compare the results of the spectral collocation method with those of the explicit second-order central-difference method. The numerical results show that the spectral collocation approximation with the direct projection method is accurate and converges rapidly when compared with the finite-difference method.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 02:40:48 GMT" }, { "version": "v2", "created": "Thu, 2 Jul 2009 22:30:54 GMT" } ]
2009-12-08T00:00:00
[ [ "Jung", "Jae-Hun", "" ], [ "Khanna", "Gaurav", "" ], [ "Nagle", "Ian", "" ] ]
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711.2546
Wojciech Moczydlowski
Wojciech Moczydlowski
Normalization of IZF with Replacement
null
Logical Methods in Computer Science, Volume 4, Issue 2 (April 8, 2008) lmcs:1235
10.2168/LMCS-4(2:1)2008
null
cs.LO
null
ZF is a well investigated impredicative constructive version of Zermelo-Fraenkel set theory. Using set terms, we axiomatize IZF with Replacement, which we call \izfr, along with its intensional counterpart \iizfr. We define a typed lambda calculus $\li$ corresponding to proofs in \iizfr according to the Curry-Howard isomorphism principle. Using realizability for \iizfr, we show weak normalization of $\li$. We use normalization to prove the disjunction, numerical existence and term existence properties. An inner extensional model is used to show these properties, along with the set existence property, for full, extensional \izfr.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 02:44:05 GMT" }, { "version": "v2", "created": "Tue, 8 Apr 2008 15:49:00 GMT" } ]
2019-03-14T00:00:00
[ [ "Moczydlowski", "Wojciech", "" ] ]
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711.2547
Syed Jafar
Viveck Cadambe, Syed A. Jafar, Shlomo Shamai (Shitz)
Interference Alignment on the Deterministic Channel and Application to Fully Connected AWGN Interference Networks
null
null
null
null
cs.IT math.IT
null
An interference alignment example is constructed for the deterministic channel model of the $K$ user interference channel. The deterministic channel example is then translated into the Gaussian setting, creating the first known example of a fully connected Gaussian $K$ user interference network with single antenna nodes, real, non-zero and contant channel coefficients, and no propagation delays where the degrees of freedom outerbound is achieved. An analogy is drawn between the propagation delay based interference alignment examples and the deterministic channel model which also allows similar constructions for the 2 user $X$ channel as well.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 02:47:23 GMT" } ]
2007-11-19T00:00:00
[ [ "Cadambe", "Viveck", "", "Shitz" ], [ "Jafar", "Syed A.", "", "Shitz" ], [ "Shamai", "Shlomo", "", "Shitz" ] ]
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711.2548
Artem Sabourov
S.P. Knurenko, A.A. Ivanov, A.V. Sabourov
Cosmic ray spectrum by energy scattered by EAS particles in the atmosphere and galactic model
7 pages, 4 figures
JETP Lett.86:709-712,2007
10.1134/S0021364007220018
null
astro-ph
null
The differential energy spectrum of cosmic rays from Cherenkov radiation measurements in EAS in the energy range of 10^15-10^20eV has been compared with an anomalous diffusion model for the particles in interstellar space having fractal properties (Lagutin et al, 2001). The close association between experimental data and calculated "all particle" spectra in form at E(0) (10^15-10^18)eV is found. In this case, the average mass composition of cosmic rays calculated by five components does not contradict the average mass composition from experimental data which was obtained by several of EAS characteristics in that energy region.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 02:50:02 GMT" } ]
2018-08-08T00:00:00
[ [ "Knurenko", "S. P.", "" ], [ "Ivanov", "A. A.", "" ], [ "Sabourov", "A. V.", "" ] ]
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711.2549
Phillip E. Parker
L. Del Riego and Phillip. E. Parker
General Connections, Exponential Maps, and Second-order Differential Equations
tp + 27 pp. 3 figures; v2: change title, refocus, rewrite intro completely, other minor changes, no change in results; v3: miscellaneous small changes, no change in results
null
null
null
math.DG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The main purpose of this article is to introduce a comprehensive, unified theory of the geometry of all connections. We show that one can study a connection via a certain, closely associated second-order differential equation. One of the most important results is our extended Ambrose-Palais-Singer correspondence. We extend the theory of geodesic sprays to certain second-order differential equations, show that locally diffeomorphic exponential maps can be defined for all, and give a full theory of (possibly nonlinear) covariant derivatives for (possibly nonlinear) connections. In the process, we introduce vertically homogeneous connections. Unlike homogeneous connections, these complete our theory and allow us to include Finsler spaces in a completely consistent manner. This is an expanded version of the article published in Differ. Geom. Dyn. Syst. 13 (2011) 72--90. Included are the proof published in Nonlinear Anal. 63 (2005) e501--e510 (for the reader's convenience) and some new material on homogeneity.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 03:27:21 GMT" }, { "version": "v2", "created": "Mon, 20 Jul 2009 07:52:05 GMT" }, { "version": "v3", "created": "Mon, 11 Jul 2011 20:09:50 GMT" } ]
2011-07-13T00:00:00
[ [ "Del Riego", "L.", "" ], [ "Parker", "Phillip. E.", "" ] ]
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711.255
S\'ilvio Duarte Queir\'os M.
Jeferson de Souza, Silvio M. Duarte Queiros
Effective multifractal features and l-variability diagrams of high-frequency price fluctuations time series
20 pages
null
null
null
q-fin.ST physics.data-an
null
In this manuscript we present a comprehensive study on the multifractal properties of high-frequency price fluctuations and instantaneous volatility of the equities that compose Dow Jones Industrial Average. The analysis consists about quantification of dependence and non-Gaussianity on the multifractal character of financial quantities. Our results point out an equivalent influence of dependence and non-Gaussianity on the multifractality of time series. Moreover, we analyse l-diagrams of price fluctuations. In the latter case, we show that the fractal dimension of these maps is basically independent of the lag between price fluctuations that we assume.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 15:44:22 GMT" } ]
2008-12-02T00:00:00
[ [ "de Souza", "Jeferson", "" ], [ "Queiros", "Silvio M. Duarte", "" ] ]
[ -0.0693363845, -0.029836297, 0.0256248917, -0.0060992786, 0.0063171098, 0.0715015009, 0.0542334132, 0.0583524033, -0.0525435694, 0.0898785442, 0.0905650482, -0.0534941033, -0.1076219007, 0.0611512065, 0.0519098751, 0.1179721951, 0.0040694862, 0.0137299774, 0.0448072553, 0.0433286391, -0.0434870645, -0.0539693721, -0.0548671037, 0.0051586432, 0.0406618565, -0.1043478325, -0.0254400633, 0.0034258934, 0.0920436606, -0.0387871861, 0.0535733178, -0.0574018694, -0.0333480015, -0.0315261409, -0.0862876251, 0.0900897756, -0.091093123, 0.0940503478, -0.0071818344, 0.0057263249, -0.0437511019, 0.0076042954, -0.0590389036, 0.0027905519, 0.0762541816, -0.0345097706, 0.0440151393, -0.0510121472, 0.0757789165, 0.0886111632, -0.0648477376, 0.0625242069, -0.0364372469, -0.0967963412, -0.062999472, 0.0092215287, 0.0029704277, 0.1012849882, 0.0115582645, -0.0475004427, 0.0080201551, -0.0811652914, 0.0018416652, 0.047394827, -0.0932582319, -0.0190107375, -0.0346945971, 0.0899313539, -0.0321862362, 0.0689667314, -0.0057197236, -0.0322654471, 0.0823270604, 0.0124823982, 0.0792642161, -0.0392360501, -0.0498239771, -0.0040793875, -0.0288065486, 0.053599719, 0.0205685627, 0.1212462634, -0.1183946505, 0.1191339567, -0.005178446, -0.1176553443, -0.0466555208, 0.0193407852, -0.0497183613, -0.0624185912, 0.0314205252, 0.0791586041, 0.0235389899, 0.0515666269, -0.0398697443, 0.0023631405, 0.1378278583, -0.0298891049, -0.0295458548, -0.0516722426, -0.0667488128, 0.0360675938, 0.0494543239, 0.0046074637, 0.0602534786, -0.0319221988, -0.0264170058, -0.0902481973, 0.0163307525, 0.1183946505, 0.0115384618, -0.0127662392, -0.0653230101, 0.0625242069, -0.0211098399, 0.0166343953, -0.2228481025, -0.0533620864, 0.0594085567, -0.0254400633, -0.0749868006, -0.0647949353, 0.051487416, 0.0470515788, 0.0724520385, -0.0298627019, -0.0984861851, 0.0256909002, -0.131068483, -0.0597254038, 0.1058264449, 0.0056042071, -0.0602534786, -0.0778912157, -0.0035183067, -0.0760429502, 0.0363580361, 0.0377046317, 0.0311564878, 0.1127970442, 0.0322654471, 0.068649888, 0.1343425512, 0.0162383392, 0.0123569798, 0.1126914322, 0.0458898097, -0.0095713791, 0.0290969908, 0.0035579125, -0.0534412973, -0.101813063, 0.0061850906, -0.0756204948, 0.0761485696, -0.0435398705, 0.0486886129, -0.0941559598, -0.0219811667, -0.0059639588, 0.0609399788, 0.0813237131, -0.1370885521, -0.0097694071, 0.0417708158, 0.0135319494, -0.0609399788, -0.0077363141, -0.0957401916, -0.0231033284, -0.0424837209, -0.132441476, 0.0301531423, -0.1702517271, 0.041295547, -0.0206873789, -0.0270903017, -0.1411019266, 0.0361468047, -0.0042312094, -0.0985389948, -0.0328727365, -0.0361204036, 0.0143240634, 0.0666432008, -0.0313413143, -0.0080201551, 0.0862348229, 0.1825030893, 0.113219507, 0.0232749525, 0.0532828756, 0.0276711863, 0.1351874769, 0.0000861733, -0.0169908479, 0.0315525457, -0.0031486535, -0.0894032791, 0.0862876251, 0.090406619, 0.1105791256, 0.0268658698, -0.0147201205, -0.0620489381, 0.0302059501, 0.0685442761, -0.0040958901, -0.0459954254, -0.0500352085, 0.0326879099, 0.014086429, 0.049058266, -0.0176245384, -0.0844921693, -0.0089310864, -0.0215983111, 0.0610984005, 0.083277598, 0.0601478629, 0.0738778412, 0.0308924504, -0.0377574377, -0.0020429944, 0.0527812019, 0.0016749912, 0.0251232181, -0.1286393255, 0.0232221447, -0.046180252, 0.0619433224, -0.0302851629, 0.0115516642, -0.0250440072, 0.0257569104, -0.0026024249, -0.0110565927, -0.0709206164, -0.0362524204, -0.0167136081, 0.0043368246, 0.0361468047, -0.025770111, 0.036384441, -0.006478833, 0.0647949353, -0.0552895628, -0.0113998419, -0.0126936287, 0.0536525287, -0.0074788774, 0.0122447638, -0.0636331663, 0.0370445363, 0.0345625766, -0.0061817905 ]
711.2551
Hendra Nurdin Dr
H. I. Nurdin, M. R. James, I. R. Petersen
Coherent quantum LQG control
25 pages, 1 figure, revised and corrected version (mainly to Section 8). To be published in Automatica, Journal of IFAC, 2009
Automatica 45 (2009), pp. 1837-1846
10.1016/j.automatica.2009.04.018
null
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Based on a recently developed notion of physical realizability for quantum linear stochastic systems, we formulate a quantum LQG optimal control problem for quantum linear stochastic systems where the controller itself may also be a quantum system and the plant output signal can be fully quantum. Such a control scheme is often referred to in the quantum control literature as "coherent feedback control.'' It distinguishes the present work from previous works on the quantum LQG problem where measurement is performed on the plant and the measurement signals are used as input to a fully classical controller with no quantum degrees of freedom. The difference in our formulation is the presence of additional non-linear and linear constraints on the coefficients of the sought after controller, rendering the problem as a type of constrained controller design problem. Due to the presence of these constraints our problem is inherently computationally hard and this also distinguishes it in an important way from the standard LQG problem. We propose a numerical procedure for solving this problem based on an alternating projections algorithm and, as initial demonstration of the feasibility of this approach, we provide fully quantum controller design examples in which numerical solutions to the problem were successfully obtained. For comparison, we also consider the case of classical linear controllers that use direct or indirect measurements, and show that there exists a fully quantum linear controller which offers an improvement in performance over the classical ones.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 04:30:14 GMT" }, { "version": "v2", "created": "Sun, 24 May 2009 09:48:32 GMT" } ]
2009-08-07T00:00:00
[ [ "Nurdin", "H. I.", "" ], [ "James", "M. R.", "" ], [ "Petersen", "I. R.", "" ] ]
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711.2552
Yuguang Shi
Xu-Qian Fan, Yuguang Shi, Luen-Fai Tam
Large-sphere and small-sphere limits of the Brown-York mass
32pages, no figure
null
null
null
math.DG math-ph math.MP
null
In this paper, we will study the limiting behavior of the Brown-York mass of the coordinate spheres in an asymptotically flat manifold. Limiting behaviors of volumes of regions related to coordinate spheres are also obtained, including a discussion on the isoperimetric mass introduced by Huisken \cite{Huisken}. We will also study expansions of the Brown-York mass and the Hawking mass of geodesic spheres with center at a fixed point $p$ of a three manifold. Some geometric consequences will be derived.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 04:25:49 GMT" } ]
2007-11-19T00:00:00
[ [ "Fan", "Xu-Qian", "" ], [ "Shi", "Yuguang", "" ], [ "Tam", "Luen-Fai", "" ] ]
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711.2553
Juan Carlos Lopez Vieyra
J.C. L\'opez Vieyra and H.O. Pil\'on
Hydrogen atom in a magnetic field: electromagnetic transitions of the lowest states
RevTeX4, 18 pages, 5 Tables, 5 Figures
null
null
null
astro-ph
null
A detailed study of the lowest states $1s_0, 2p_{-1}, 2p_0$ of the hydrogen atom placed in a magnetic field $B\in(0-4.414\times 10^{13} {\rm G})$ and their electromagnetic transitions ($1s_{0} \leftrightarrow 2p_{-1}$ and $ 1s_{0} \leftrightarrow 2p_{0}$) is carried out in the Born Oppenheimer approximation. The variational method is used with a physically motivated recipe to design simple trial functions applicable to the whole domain of magnetic fields. We show that the proposed functions yield very accurate results for the ionization (binding) energies. Dipole and oscillator strengths are in good agreement with results by Ruder {\em et al.} \cite{Ruderbook} although we observe deviations up to $\sim 30%$ for the oscillator strength of the (linearly polarized) electromagnetic transition $1s_{0} \leftrightarrow 2p_{0}$ at strong magnetic fields $B\gtrsim 1000$ a.u.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 04:37:32 GMT" } ]
2007-11-19T00:00:00
[ [ "Vieyra", "J. C. López", "" ], [ "Pilón", "H. O.", "" ] ]
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711.2554
Lasha Ephremidze
Lasha Ephremidze and Nobuhiko Fujii
On the estimation of the convergence rate in the Janashia-Lagvilava spectral factorization algorithm
9 pages
null
null
null
math.CV
null
In the present paper, we estimate the convergence rate in the Janashia-Lagvilava spectral factorization algorithm (see Studia Mathematica, 137, 1999, 93-100) under the restriction on a spectral density matrix that its inverse is integrable.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 05:54:49 GMT" } ]
2007-11-19T00:00:00
[ [ "Ephremidze", "Lasha", "" ], [ "Fujii", "Nobuhiko", "" ] ]
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711.2555
Alex Castro Mr.
Alex L. Castro (UCSC) and Richard Montgomery (UCSC)
The Chains of Left-invariant CR-structures on SU(2)
26 pages, 2 figures. Reviewed on 06/14/08. Typos corrected, and a few extra notes were added along the text during proof. Accepted for publication in the "Pacific Journal of Mathematics."
null
null
null
math.CV math.DG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We compute the chains associated to the left-invariant CR structures on the three-sphere. These structures are characterized by a single real modulus $a$. For the standard structure $a=1$, the chains are well-known and are closed curves. We show that for almost all other values of the modulus $a$ either two or three types of chains are simultaneously present : (I) closed curves, (II) quasi-periodic curves dense on two-torii, or (III) chains homoclinic between closed curves. For $1 < a < \sqrt{3}$ no curves of the last type occur. A bifurcation occurs at $a = \sqrt{3}$ and from that point on all three types of chains are guaranteed to exist, and exhaust all chains. The method of proof is to use the Fefferman metric characterization of chains, combined with tools from geometric mechanics. The key to the computation is a reduced Hamiltonian system, similar to Euler's rigid body system, and depending on $a$, which is integrable.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 06:45:47 GMT" }, { "version": "v2", "created": "Sat, 14 Jun 2008 21:42:51 GMT" } ]
2008-06-16T00:00:00
[ [ "Castro", "Alex L.", "", "UCSC" ], [ "Montgomery", "Richard", "", "UCSC" ] ]
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711.2556
Roman Orus
Roman Orus
Universal geometric entanglement close to quantum phase transitions
4 pages, 3 figures
Phys.Rev.Lett.100:130502,2008
10.1103/PhysRevLett.100.130502
null
quant-ph cond-mat.str-el hep-th
null
Under successive Renormalization Group transformations applied to a quantum state $\ket{\Psi}$ of finite correlation length $\xi$, there is typically a loss of entanglement after each iteration. How good it is then to replace $\ket{\Psi}$ by a product state at every step of the process? In this paper we give a quantitative answer to this question by providing first analytical and general proofs that, for translationally invariant quantum systems in one spatial dimension, the global geometric entanglement per region of size $L \gg \xi$ diverges with the correlation length as $(c/12) \log{(\xi/\epsilon)}$ close to a quantum critical point with central charge $c$, where $\epsilon$ is a cut-off at short distances. Moreover, the situation at criticality is also discussed and an upper bound on the critical global geometric entanglement is provided in terms of a logarithmic function of $L$.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 05:11:56 GMT" }, { "version": "v2", "created": "Mon, 26 Nov 2007 07:57:19 GMT" }, { "version": "v3", "created": "Mon, 24 Mar 2008 23:41:16 GMT" } ]
2008-11-26T00:00:00
[ [ "Orus", "Roman", "" ] ]
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711.2557
Takahiro Nagai
M. Hirai, S. Kumano, and T.-H. Nagai
Global NLO Analysis of Nuclear Parton Distribution Functions
3 pages, LaTeX, 4 eps files, to be published in the AIP proceedings of the 9th International Workshop on Neutrino Factories, Superbeams and Betabeams (NuFact07), Okayama, Japan, August 6 - 11, 2007. A code for calculating our nuclear parton distribution functions and their uncertainties can be obtained from http://research.kek.jp/people/kumanos/nuclp.html
AIPConf.Proc.981:265-267,2008
10.1063/1.2898955
KEK-TH-1201
hep-ph hep-ex nucl-ex nucl-th
null
Nuclear parton distribution functions (NPDFs) are determined by a global analysis of experimental measurements on structure-function ratios F_2^A/F_2^{A'} and Drell-Yan cross section ratios \sigma_{DY}^A/\sigma_{DY}^{A'}, and their uncertainties are estimated by the Hessian method. The NPDFs are obtained in both leading order (LO) and next-to-leading order (NLO) of \alpha_s. As a result, valence-quark distributions are relatively well determined, whereas antiquark distributions at x>0.2 and gluon distributions in the whole x region have large uncertainties. The NLO uncertainties are slightly smaller than the LO ones; however, such a NLO improvement is not as significant as the nucleonic case.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 05:12:31 GMT" } ]
2008-11-26T00:00:00
[ [ "Hirai", "M.", "" ], [ "Kumano", "S.", "" ], [ "Nagai", "T. -H.", "" ] ]
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711.2558
Gerard Milburn
M.Duncan, J.Links, G.J.Milburn
Iterated dynamical maps in an ion trap
4 pages, 3 figures
null
null
null
quant-ph
null
Iterated dynamical maps offer an ideal setting to investigate quantum dynamical bifurcations and are well adapted to few-qubit quantum computer realisations. We show that a single trapped ion, subject to periodic impulsive forces, exhibits a rich structure of dynamical bifurcations derived from the Jahn-Teller Hamiltonian flow model. We show that the entanglement between the oscillator and electronic degrees of freedom reflects the underlying dynamical bifurcation in a Floquet eigenstate.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 05:40:46 GMT" } ]
2007-11-19T00:00:00
[ [ "Duncan", "M.", "" ], [ "Links", "J.", "" ], [ "Milburn", "G. J.", "" ] ]
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711.2559
Jaume Garriga
Jaume Garriga and Alexander Vilenkin
Prediction and explanation in the multiverse
Minor clarifications added
Phys.Rev.D77:043526,2008
10.1103/PhysRevD.77.043526
null
hep-th astro-ph gr-qc
null
Probabilities in the multiverse can be calculated by assuming that we are typical representatives in a given reference class. But is this class well defined? What should be included in the ensemble in which we are supposed to be typical? There is a widespread belief that this question is inherently vague, and that there are various possible choices for the types of reference objects which should be counted in. Here we argue that the ``ideal'' reference class (for the purpose of making predictions) can be defined unambiguously in a rather precise way, as the set of all observers with identical information content. When the observers in a given class perform an experiment, the class branches into subclasses who learn different information from the outcome of that experiment. The probabilities for the different outcomes are defined as the relative numbers of observers in each subclass. For practical purposes, wider reference classes can be used, where we trace over all information which is uncorrelated to the outcome of the experiment, or whose correlation with it is beyond our current understanding. We argue that, once we have gathered all practically available evidence, the optimal strategy for making predictions is to consider ourselves typical in any reference class we belong to, unless we have evidence to the contrary. In the latter case, the class must be correspondingly narrowed.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 05:27:57 GMT" }, { "version": "v2", "created": "Thu, 22 Nov 2007 05:28:38 GMT" }, { "version": "v3", "created": "Thu, 17 Jan 2008 16:51:21 GMT" } ]
2008-11-26T00:00:00
[ [ "Garriga", "Jaume", "" ], [ "Vilenkin", "Alexander", "" ] ]
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711.256
Shun'ya Mizoguchi
Shun'ya Mizoguchi
Warped String Compactification via Singular Calabi-Yau Conformal Field Theory
10 pages. Figure and table changed
Phys.Lett.B669:352-356,2008
10.1016/j.physletb.2008.09.061
KEK-TH-1196
hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We construct spacetime supersymmetric, modular invariant partition functions of strings on the conifold-type singularities which include contributions from the discrete-series representations of SL(2, R). The discrete spectrum is automatically consistent with the GSO projection in the continuous sector, and contains massless matter fields localized on a four-dimensional submanifold at the tip of a cigar. In particular, they are in the 27+1 of E6 for the E8 x E8 heterotic string. We speculate about a possible realization of local E6 GUT by using this framework.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 05:40:58 GMT" }, { "version": "v2", "created": "Fri, 25 Jan 2008 09:42:11 GMT" }, { "version": "v3", "created": "Tue, 26 Aug 2008 10:34:38 GMT" } ]
2008-11-26T00:00:00
[ [ "Mizoguchi", "Shun'ya", "" ] ]
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711.2561
Dario Fadda
Dario Fadda (1), Andrea Biviano (2), Francine R. Marleau (3), Lisa J. Storrie-Lombardi (3), Florence Durret (4) ((1) NHSC-Caltech (2) INAF-Trieste (3) SSC-Caltech (4) IAP-CNRS)
Starburst galaxies in cluster-feeding filaments unveiled by Spitzer
5 pages, 2 figures, 1 table, accepted for publication on ApJ Letters
null
10.1086/526457
null
astro-ph
null
We report the first direct detection with Spitzer of galaxy filaments. Using Spitzer and ancillary optical data, we have discovered two filamentary structures in the outskirts of the cluster Abell 1763. Both filaments point toward Abell 1770 which lies at the same redshift as Abell 1763 (z=0.23), at a projected distance of ~13 Mpc. The X-ray cluster emission is elongated along the same direction. Most of the far-infrared emission is powered by star formation. According to the optical spectra, only one of the cluster members is classified as an active galactic nucleus. Star formation is clearly enhanced in galaxies along the filaments: the fraction of starburst galaxies in the filaments is more than twice than that in other cluster regions. We speculate that these filaments are feeding the cluster Abell 1763 by the infall of galaxies and galaxy groups. Evidence for one of these groups is provided by the analysis of galaxy kinematics in the central cluster region.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 05:47:08 GMT" } ]
2009-11-13T00:00:00
[ [ "Fadda", "Dario", "" ], [ "Biviano", "Andrea", "" ], [ "Marleau", "Francine R.", "" ], [ "Storrie-Lombardi", "Lisa J.", "" ], [ "Durret", "Florence", "" ] ]
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711.2562
J. Maurice Rojas
Ashraf Ibrahim, J. Maurice Rojas, Korben Rusek
Algorithmic Arithmetic Fewnomial Theory I: One Variable
This paper has been withdrawn by the authors
null
null
null
math.NT cs.CC math.AG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Withdrawn by the authors due to an error in the proof of the finite field result (Thm. 1.5): The random primes used in the proof need NOT avoid the exceptional primes from Lemma 2.7, thus leaving Thm. 1.5 unproved.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 06:15:35 GMT" }, { "version": "v2", "created": "Sun, 24 Jan 2010 16:04:36 GMT" } ]
2010-01-24T00:00:00
[ [ "Ibrahim", "Ashraf", "" ], [ "Rojas", "J. Maurice", "" ], [ "Rusek", "Korben", "" ] ]
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711.2563
Sanjeev S. Seahra
Antonio Cardoso, Kazuya Koyama, Sanjeev S. Seahra, Fabio P. Silva
Cosmological perturbations in the DGP braneworld: numeric solution
Typos corrected, including a misprint in Eq. (34). 16 pages, 10 figures
Phys.Rev.D77:083512,2008
10.1103/PhysRevD.77.083512
null
astro-ph gr-qc hep-th
null
We solve for the behaviour of cosmological perturbations in the Dvali-Gabadadze-Porrati (DGP) braneworld model using a new numerical method. Unlike some other approaches in the literature, our method uses no approximations other than linear theory and is valid on large scales. We examine the behaviour of late-universe density perturbations for both the self-accelerating and normal branches of DGP cosmology. Our numerical results can form the basis of a detailed comparison between the DGP model and cosmological observations.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 20:13:25 GMT" }, { "version": "v2", "created": "Sun, 9 Dec 2007 22:40:18 GMT" } ]
2008-11-26T00:00:00
[ [ "Cardoso", "Antonio", "" ], [ "Koyama", "Kazuya", "" ], [ "Seahra", "Sanjeev S.", "" ], [ "Silva", "Fabio P.", "" ] ]
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711.2564
Vill\H{o} Csisz\'ar
V. Csisz\'ar
Conditional independence relations and log-linear models for random permutations
25 pages
null
null
null
math.ST stat.TH
null
We propose a new class of models for random permutations, which we call log-linear models, by the analogy with log-linear models used in the analysis of contingency tables. As a special case, we study the family of all Luce-decomposable distributions, and the family of those random permutations, for which the distribution of both the permutation and its inverse is Luce-decomposable. We show that these latter models can be described by conditional independence relations. We calculate the number of free parameters in these models, and describe an iterative algorithm for maximum likelihood estimation, which enables us to test if a set of data satisfies the conditional independence relations or not.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 07:11:59 GMT" } ]
2007-11-19T00:00:00
[ [ "Csiszár", "V.", "" ] ]
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711.2565
Lorenzo Malavasi
Lorenzo Malavasi, Clemens Ritter, Gaetano Chiodelli
Correlation between Thermal Properties, Electrical Conductivity and Crystal Structure in the BaCe0.80Y0.20O2.9 Proton Conductor
33 pages, 13 Figures
null
null
null
cond-mat.mtrl-sci
null
In this paper we report an extensive neutron diffraction investigation at high temperature on the BaCe0.80Y0.20O2.9 proton conducting material. Our results precisely define the structural evolution of the compound as a function of temperature which is from a monoclinic (room temperature) to a cubic (800C) structure. Neutron data have been correlated to calorimetric measurements (TGA and DSC) and conductivity properties of the material.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 07:58:10 GMT" } ]
2007-11-19T00:00:00
[ [ "Malavasi", "Lorenzo", "" ], [ "Ritter", "Clemens", "" ], [ "Chiodelli", "Gaetano", "" ] ]
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711.2566
Hasi Ray Dr
Hasi Ray
Resonances in Ps-H scattering
18 pages, 4 figures, see Phys. Rev. A Vol.73, p. 064501 (2006)
null
null
null
physics.atom-ph
null
The best 3-channel projectile-inelastic [H(1s)+Ps(1s,2s,2p)] close-coupling approximation (CCA) is performed for positronium (Ps) and hydrogen (H) collision considering both the atoms in ground states at the incident channel. The s-wave elastic phase shifts and cross sections in the singlet and triplet channels and the total (or integrated) cross section are studied below inelastic threshold. Resonances in singlet channel using 2-channel and 3-channel projectile-inelastic CCAs confirm earlier prediction [1]. A resonance in triplet channel using 3-channel projectile-inelastic CCA is a new addition.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 08:01:14 GMT" } ]
2007-11-19T00:00:00
[ [ "Ray", "Hasi", "" ] ]
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711.2567
Vasily E. Tarasov
Vasily E. Tarasov
Fractional Derivative as Fractional Power of Derivative
20 pages, LaTeX
International Journal of Mathematics. Vol.18. No.3. (2007) 281-299
10.1142/S0129167X07004102
null
nlin.CD
null
Definitions of fractional derivatives as fractional powers of derivative operators are suggested. The Taylor series and Fourier series are used to define fractional power of self-adjoint derivative operator. The Fourier integrals and Weyl quantization procedure are applied to derive the definition of fractional derivative operator. Fractional generalization of concept of stability is considered.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 08:22:29 GMT" } ]
2015-03-17T00:00:00
[ [ "Tarasov", "Vasily E.", "" ] ]
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711.2568
Daniel Sevcovic
D. Sevcovic and S. Yazaki
Computational and qualitative aspects of motion of plane curves with a curvature adjusted tangential velocity
submitted to MMAS
null
null
null
math.NA math.AP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper we investigate a time dependent family of plane closed Jordan curves evolving in the normal direction with a velocity which is assumed to be a function of the curvature, tangential angle and position vector of a curve. We follow the direct approach and analyze the system of governing PDEs for relevant geometric quantities. We focus on a class of the so-called curvature adjusted tangential velocities for computation of the curvature driven flow of plane closed curves. Such a curvature adjusted tangential velocity depends on the modulus of the curvature and its curve average. Using the theory of abstract parabolic equations we prove local existence, uniqueness and continuation of classical solutions to the system of governing equations. We furthermore analyze geometric flows for which normal velocity may depend on global curve quantities like the length, enclosed area or total elastic energy of a curve. We also propose a stable numerical approximation scheme based on the flowing finite volume method. Several computational examples of various nonlocal geometric flows are also presented in this paper.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 08:55:34 GMT" }, { "version": "v2", "created": "Fri, 9 Sep 2011 10:39:22 GMT" }, { "version": "v3", "created": "Thu, 1 Mar 2012 08:11:43 GMT" } ]
2012-03-02T00:00:00
[ [ "Sevcovic", "D.", "" ], [ "Yazaki", "S.", "" ] ]
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711.2569
Ricardo Weder
Miguel Ballesteros and Ricardo Weder
High-Velocity Estimates for the Scattering Operator and Aharonov-Bohm Effect in Three Dimensions
null
Communications Mathematical Physics vol 285, 345-398 (2009)
10.1007/s00220-008-0579-1
null
math-ph math.MP
null
We obtain high-velocity estimates with error bounds for the scattering operator of the Schr\"odinger equation in three dimensions with electromagnetic potentials in the exterior of bounded obstacles that are handlebodies. A particular case is a finite number of tori. We prove our results with time-dependent methods. We consider high-velocity estimates where the direction of the velocity of the incoming electrons is kept fixed as its absolute value goes to infinity. In the case of one torus our results give a rigorous proof that quantum mechanics predicts the interference patterns observed in the fundamental experiments of Tonomura et al. that gave a conclusive evidence of the existence of the Aharonov-Bohm effect using a toroidal magnet. We give a method for the reconstruction of the flux of the magnetic field over a cross-section of the torus modulo $2\pi$. Equivalently, we determine modulo $2\pi$ the difference in phase for two electrons that travel to infinity, when one goes inside the hole and the other outside it. For this purpose we only need the high-velocity limit of the scattering operator for one direction of the velocity of the incoming electrons. When there are several tori -or more generally handlebodies- the information that we obtain in the fluxes, and on the difference of phases, depends on the relative position of the tori and on the direction of the velocities when we take the high-velocity limit of the incoming electrons. For some locations of the tori we can determine all the fluxes modulo 2$\pi$ by taking the high-velocity limit in only one direction. We also give a method for the unique reconstruction of the electric potential and the magnetic field outside the handlebodies from the high-velocity limit of the scattering operator.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 08:57:48 GMT" } ]
2020-05-22T00:00:00
[ [ "Ballesteros", "Miguel", "" ], [ "Weder", "Ricardo", "" ] ]
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711.257
Xiaofeng Wang Dr.
Xiaofeng Wang (1,2), Weidong Li (1), Alexei V. Filippenko (1), Ryan J. Foley (1), Nathan Smith (1), and Lifan Wang (3) ((1) UC Berkeley; (2) Tsinghua University; (3) Texas A&M University)
The Detection of a Light Echo from the Type Ia Supernova 2006X in M100
18 pages, 5 figures and 3 tables. ApJ in press (accepted version)
Astrophys.J.677:1060-1068,2008
10.1086/529070
null
astro-ph
null
We report the discovery of a light echo (LE) from the Type Ia supernova (SN) 2006X in the nearby galaxy M100. The presence of the LE is supported by analysis of both the Advanced Camera for Surveys (ACS) images taken with the {\it Hubble Space Telescope (HST)} at $\sim$300 d after maximum brightness and the Keck optical spectrum obtained at a similar phase. In the image procedure, both the radial-profile analysis and the point-spread-function (PSF) subtraction method resolve significant excess emission at 2--5 ACS pixels ($\sim0.05''-0.13''$) from the center. In particular, the PSF-subtracted ACS images distinctly appear to have an extended, ring-like echo. Due to limitations of the image resolution, we cannot confirm any structure or flux within 2 ACS pixels from the SN. The late-time spectrum of SN 2006X can be reasonably fit with two components: a nebular spectrum of a normal SN Ia and a synthetic LE spectrum. Both image and spectral analysis show a rather blue color for the emission of the LE, suggestive of a small average grain size for the scattering dust. Using the Cepheid distance to M100 of 15.2 Mpc, we find that the dust illuminated by the resolved LE is $\sim$27--170 pc from the SN. The echo inferred from the nebular spectrum appears to be more luminous than that resolved in the images (at the $\sim2\sigma$ level), perhaps suggesting the presence of an inner echo at $<$2 ACS pixels ($\sim0.05''$). It is not clear, however, whether this possible local echo was produced by a distinct dust component (i.e., the local circumstellar dust) or by a continuous, larger distribution of dust as with the outer component. Nevertheless, our detection of a significant echo in SN 2006X confirms that this supernova was produced in a dusty environment having unusual dust properties.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 09:21:39 GMT" }, { "version": "v2", "created": "Tue, 20 Nov 2007 19:54:52 GMT" }, { "version": "v3", "created": "Thu, 3 Jan 2008 08:41:06 GMT" } ]
2014-11-18T00:00:00
[ [ "Wang", "Xiaofeng", "" ], [ "Li", "Weidong", "" ], [ "Filippenko", "Alexei V.", "" ], [ "Foley", "Ryan J.", "" ], [ "Smith", "Nathan", "" ], [ "Wang", "Lifan", "" ] ]
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711.2571
Kashif Ali
Kashif Ali, Edy Tri Baskoro
On the Ramsey numbers for a combination of paths and Jahangirs
null
null
null
null
math.CO
null
For given graphs $G$ and $H,$ the \emph{Ramsey number} $R(G,H)$ is the least natural number $n$ such that for every graph $F$ of order $n$ the following condition holds: either $F$ contains $G$ or the complement of $F$ contains $H.$ In this paper, we improve the Surahmat and Tomescu's result \cite{ST:06} on the Ramsey number of paths versus Jahangirs. We also determine the Ramsey number $R(\cup G,H)$, where $G$ is a path and $H$ is a Jahangir graph.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 09:31:36 GMT" } ]
2007-11-19T00:00:00
[ [ "Ali", "Kashif", "" ], [ "Baskoro", "Edy Tri", "" ] ]
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711.2572
Peter Jonker
P.G. Jonker, J. Kaastra, M. Mendez, J.J.M. In 't Zand
Constraining the neutron star equation of state using XMM-Newton
4 pages, 1 figure, proceedings of the XMM-Newton workshop, June 2007, accepted for publication in AN
null
10.1002/asna.200710912
null
astro-ph
null
We have identified three possible ways in which future XMM-Newton observations can provide significant constraints on the equation of state of neutron stars. First, using a long observation of the neutron star X-ray transient CenX-4 in quiescence one can use the RGS spectrum to constrain the interstellar extinction to the source. This removes this parameter from the X-ray spectral fitting of the pn and MOS spectra and allows us to investigate whether the variability observed in the quiescent X-ray spectrum of this source is due to variations in the soft thermal spectral component or variations in the power law spectral component coupled with variations in N_H. This will test whether the soft thermal spectral component can indeed be due to the hot thermal glow of the neutron star. Potentially such an observation could also reveal redshifted spectral lines from the neutron star surface. Second, XMM-Newton observations of radius expansion type I X-ray bursts might reveal redshifted absorption lines from the surface of the neutron star. Third, XMM-Newton observations of eclipsing quiescent low-mass X-ray binaries provide the eclipse duration. With this the system inclination can be determined accurately. The inclination determined from the X-ray eclipse duration in quiescence, the rotational velocity of the companion star and the semi-amplitude of the radial velocity curve determined through optical spectroscopy, yield the neutron star mass.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 09:38:00 GMT" } ]
2009-11-13T00:00:00
[ [ "Jonker", "P. G.", "" ], [ "Kaastra", "J.", "" ], [ "Mendez", "M.", "" ], [ "Zand", "J. J. M. In 't", "" ] ]
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711.2573
David Burton
D.A. Burton, R.W. Tucker, C.H. Wang
Spinning particles in scalar-tensor gravity
8 pages Corrected typo in address footnote
Phys.Lett.A372:3141-3144,2008
10.1016/j.physleta.2008.01.048
null
gr-qc
null
We develop a new model of a spinning particle in Brans-Dicke spacetime using a metric-compatible connection with torsion. The particle's spin vector is shown to be Fermi-parallel (by the Levi-Civita connection) along its worldline (an autoparallel of the metric-compatible connection) when neglecting spin-curvature coupling.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 09:58:59 GMT" }, { "version": "v2", "created": "Tue, 20 Nov 2007 15:40:53 GMT" } ]
2008-11-26T00:00:00
[ [ "Burton", "D. A.", "" ], [ "Tucker", "R. W.", "" ], [ "Wang", "C. H.", "" ] ]
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711.2574
Michael Rissi mr
MAGIC Collaboration: J. Albert, et al
Upper limit for gamma-ray emission above 140 GeV from the dwarf spheroidal galaxy Draco
Accepted for publication by Astrophysical Journal
Astrophys.J.679:428-431,2008
10.1086/529135
null
astro-ph
null
The nearby dwarf spheroidal galaxy Draco with its high mass to light ratio is one of the most auspicious targets for indirect dark matter searches. Annihilation of hypothetical DM particles can result in high-energy gamma-rays, e.g. from neutralino annihilation in the supersymmetric framework. With the MAGIC telescope a search for a possible DM signal originating from Draco was performed during 2007. The analysis of the data results in a flux upper limit of 1.1x10^-11 photons cm^-2 sec^-1 for photon energies above 140 GeV, assuming a point like source. Furthermore, a comparison with predictions from supersymmetric models is given. While our results do not constrain the mSUGRA phase parameter space, a very high flux enhancement can be ruled out.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 09:51:25 GMT" }, { "version": "v2", "created": "Sun, 13 Jan 2008 03:42:35 GMT" } ]
2008-11-26T00:00:00
[ [ "MAGIC Collaboration", "", "" ], [ "Albert", "J.", "" ] ]
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711.2575
Istvan Nagy
I. Nagy and A. Zawadowski
Coupling of conduction electrons to two-level systems formed by hydrogen: A scattering approach
28 pages, 6 figures, submitted to PRB
null
null
null
cond-mat.str-el
null
An effective Hamiltonian which could model the interaction between a tunneling proton and the conduction electrons of a metal is investigated. A remarkably simple correlation between the motion of the $TLS$-atom and an angular-momentum change of scattering electron is deduced, at the first-order Born level, by using a momentum-space representation with plane waves for initial and final states. It is shown that the angular average of the scattering amplitude-change at the Fermi surface depends solely on the difference of the first two phase shifts, for small-distance displacements of the heavy particle. For such a limit of displacement, and within a distorted-wave Born approximation for initial and final states, the change in the scattering amplitude is expressed via trigonometric functions of scattering phase shifts at the Fermi energy. The numerical value of this change is analyzed in the framework of a self-consistent screening description for impurity-embedding in a paramagnetic electron gas. In order to discuss the so-called antiabatic limit on the same footing, a comparison with matrix elements obtained by the potential-gradient of an unscreened Coulomb field is given as well. The coupling of the tunneling proton to a free-electron-like electron gas is in the typical range obtained, by ultrasound experiments for different metallic glasses, from scattering rates for a Korringa-type relaxation process. That coupling is too weak to be in the range required for realization of the two-channel Kondo effect.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 09:52:53 GMT" } ]
2007-11-19T00:00:00
[ [ "Nagy", "I.", "" ], [ "Zawadowski", "A.", "" ] ]
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711.2576
Frank Aurzada
Frank Aurzada
A short note on small deviations of sequences of i.i.d. random variables with exponentially decreasing weights
Revision, 13p, to appear in: Statist. Probab. Lett
Statistics & Probability Letters 78 (2008), 2300-2307
10.1016/j.spl.2008.02.007
null
math.PR
null
We obtain some new results concerning the small deviation problem for $S=\sum_n q^n X_n$ and $M=\sup_n q^n X_n$, where $0<q<1$ and $(X_n)$ are i.i.d. non-negative random variables. In particular, the asymptotics is shown to be the same for $S$ and $M$ in some cases.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 09:57:46 GMT" }, { "version": "v2", "created": "Thu, 14 Feb 2008 12:33:54 GMT" } ]
2008-11-14T00:00:00
[ [ "Aurzada", "Frank", "" ] ]
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711.2577
Luis Peralta
S. Rodrigues, B. Tome, M. C. Abreu, N. Santos, P. Rato Mendes, L. Peralta
Monte Carlo Simulation and Experimental Characterization of a Dual Head Gamma Camera
11 pages, 13 figures
null
null
null
physics.med-ph
null
The GEANT4 Monte Carlo simulation and experimental characterization of the Siemens E.Cam Dual Head gamma camera hosted in the Particular Hospital of Algarve have been done. Imaging tests of thyroid and other phantoms have been made "in situ" and compared with the results obtained with the Monte Carlo simulation.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 10:00:40 GMT" } ]
2007-11-19T00:00:00
[ [ "Rodrigues", "S.", "" ], [ "Tome", "B.", "" ], [ "Abreu", "M. C.", "" ], [ "Santos", "N.", "" ], [ "Mendes", "P. Rato", "" ], [ "Peralta", "L.", "" ] ]
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711.2578
Hasi Ray Dr
Hasi Ray
Target-ionization with exchange in Ps-atom scattering
11 pages, 4 figures, 1 table, XIV International positron Workshop at UK (2007)
null
null
null
physics.atom-ph
null
A proposal is made by the University College of London Group [1] for measuring the target-ionization cross sections in Ps and atom scattering. We calculate the corresponding theoretical data for Ps-H and Ps-He systems including the effect of exchange on Coulomb-Born approximation for the projectile-elastic and projectile-inelastic processes and report the total target-ionization cross sections for the first time.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 10:00:41 GMT" } ]
2007-11-19T00:00:00
[ [ "Ray", "Hasi", "" ] ]
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711.2579
Peter Jonker
P.G. Jonker (SRON, Cfa, Uu)
Constraining the neutron star equation of state using quiescent low-mass X-ray binaries
7 pages, 3 figures, proceedings "40 years of pulsars" conference
AIPConf.Proc.983:519-525,2008
10.1063/1.2900287
null
astro-ph
null
Chandra or XMM-Newton observations of quiescent low-mass X-ray binaries can provide important constraints on the equation of state of neutron stars. The mass and radius of the neutron star can potentially be determined from fitting a neutron star atmosphere model to the observed X-ray spectrum. For a radius measurement it is of critical importance that the distance to the source is well constrained since the fractional uncertainty in the radius is at least as large as the fractional uncertainty in the distance. Uncertainties in modelling the neutron star atmosphere remain. At this stage it is not yet clear if the soft thermal component in the spectra of many quiescent X-ray binaries is variable on timescales too short to be accommodated by the cooling neutron star scenario. This can be tested with a long XMM-Newton observation of the neutron star X-ray transient CenX-4 in quiescence. With such an observation one can use the Reflection Grating Spectrometer spectrum to constrain the interstellar extinction to the source. This removes this parameter from the X-ray spectral fitting of the EPIC pn and MOS spectra and allows one to investigate whether the variability observed in the quiescent X-ray spectrum of this source is due to variations in the soft thermal spectral component or variations in the power law spectral component coupled with variations in N_H. This will test whether the soft thermal component can indeed be due to the hot thermal glow of the neutron star. Irrespective of the outcome of such a study, the observed cooling in quiescence in sources for which the crust is significantly out of thermal equilibrium with the core due to a prolonged outburst, such as KS 1731-260, seem excellent candidates for mass and radius determinations through modelling the observed X-rays with a neutron star atmosphere model.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 10:03:15 GMT" } ]
2008-11-26T00:00:00
[ [ "Jonker", "P. G.", "", "SRON, Cfa, Uu" ] ]
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711.258
Shunsaku Horiuchi
Shunsaku Horiuchi (Tokyo University), Shin'ichiro Ando (Caltech)
High-energy neutrinos from reverse shocks in choked and successful relativistic jets
11 pages, 7 figures, 2 tables; accepted for publication in Physical Review D
Phys.Rev.D77:063007,2008
10.1103/PhysRevD.77.063007
null
astro-ph
null
Highly relativistic jets are a key element of current gamma-ray burst models, where the jet kinetic energy is converted to radiation energy at optically thin shocks. High-energy neutrinos are also expected, from interactions of protons accelerated in the same shocks. Here we revisit the early evolution of a relativistic jet, while the jet is still inside the star, and investigate its neutrino emission. In particular we study propagation of mildly relativistic and ultrarelativistic jets through a type Ib progenitor, and follow reverse shocks as the jets cross the star. We show that protons can be accelerated to 10^4-10^5 GeV at reverse shocks, and efficiently produce mesons. The mesons experience significant cooling, suppressing subsequent neutrino emission. We show, however, that the neutrino yield from the reverse shock is still reasonably large, especially for low-luminosity and long-duration jets, where meson cooling is less severe. We discuss implications of our results in the context of neutrinos from choked jets, which are completely shock heated and do not break out of the star. From a choked jet with isotropic equivalent energy of 10^{53} erg at 10 Mpc, we expect ~20 neutrino events at IceCube.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 14:55:36 GMT" }, { "version": "v2", "created": "Tue, 18 Mar 2008 04:04:36 GMT" } ]
2008-11-26T00:00:00
[ [ "Horiuchi", "Shunsaku", "", "Tokyo University" ], [ "Ando", "Shin'ichiro", "", "Caltech" ] ]
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711.2581
Stephen Kane
S.R. Kane, W.I. Clarkson, R.G. West, D.M. Wilson, D.J. Christian, A. Collier Cameron, B. Enoch, T.A. Lister, R.A. Street, A. Evans, A. Fitzsimmons, C.A. Haswell, C. Hellier, S.T. Hodgkin, K. Horne, J. Irwin, F.P. Keenan, A.J. Norton, J. Osborne, N.R. Parley, D.L. Pollacco, R. Ryans, I. Skillen, P.J. Wheatley
SuperWASP-N Extra-solar Planet Candidates from Fields 06hr < RA < 16hr
13 pages, 6 figures, 4 tables, accepted for publication in MNRAS
null
10.1111/j.1365-2966.2007.12722.x
null
astro-ph
null
The Wide Angle Search for Planets (WASP) survey currently operates two installations, designated SuperWASP-N and SuperWASP-S, located in the northern and southern hemispheres respectively. These installations are designed to provide high time-resolution photometry for the purpose of detecting transiting extra-solar planets, asteroids, and transient events. Here we present results from a transit-hunting observing campaign using SuperWASP-N covering a right ascension range of 06hr < RA < 16hr. This paper represents the fifth and final in the series of transit candidates released from the 2004 observing season. In total, 729,335 stars from 33 fields were monitored with 130,566 having sufficient precision to be scanned for transit signatures. Using a robust transit detection algorithm and selection criteria, 6 stars were found to have events consistent with the signature of a transiting extra-solar planet based upon the photometry, including the known transiting planet XO-1b. These transit candidates are presented here along with discussion of follow-up observations and the expected number of candidates in relation to the overall observing strategy.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 10:11:22 GMT" } ]
2009-11-13T00:00:00
[ [ "Kane", "S. R.", "" ], [ "Clarkson", "W. I.", "" ], [ "West", "R. G.", "" ], [ "Wilson", "D. M.", "" ], [ "Christian", "D. J.", "" ], [ "Cameron", "A. Collier", "" ], [ "Enoch", "B.", "" ], [ "Lister", "T. A.", "" ], [ "Street", "R. A.", "" ], [ "Evans", "A.", "" ], [ "Fitzsimmons", "A.", "" ], [ "Haswell", "C. A.", "" ], [ "Hellier", "C.", "" ], [ "Hodgkin", "S. T.", "" ], [ "Horne", "K.", "" ], [ "Irwin", "J.", "" ], [ "Keenan", "F. P.", "" ], [ "Norton", "A. J.", "" ], [ "Osborne", "J.", "" ], [ "Parley", "N. R.", "" ], [ "Pollacco", "D. L.", "" ], [ "Ryans", "R.", "" ], [ "Skillen", "I.", "" ], [ "Wheatley", "P. J.", "" ] ]
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711.2582
Philip Rippon
P. J. Rippon and G. M. Stallard
On multiply connected wandering domains of meromorphic functions
18 pages. To be published in the Journal of the London Mathematical Society
null
10.1112/jlms/jdm118
null
math.CV math.DS
null
We describe conditions under which a multiply connected wandering domain of a transcendental meromorphic function with a finite number of poles must be a Baker wandering domain, and we discuss the possible eventual connectivity of Fatou components of transcendental meromorphic functions. We also show that if $f$ is meromorphic, $U$ is a bounded component of $F(f)$ and $V$ is the component of $F(f)$ such that $f(U)\subset V$, then $f$ maps each component of $\partial U$ onto a component of the boundary of $V$ in $\hat{\C}$. We give examples which show that our results are sharp; for example, we prove that a multiply connected wandering domain can map to a simply connected wandering domain, and vice versa.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 15:33:08 GMT" } ]
2014-02-26T00:00:00
[ [ "Rippon", "P. J.", "" ], [ "Stallard", "G. M.", "" ] ]
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711.2583
Kazuo Fujikawa
Kazuo Fujikawa
Geometric Phase and Chiral Anomaly in Path Integral Formulation
8 pages
null
10.1142/9789812837271_0013
null
quant-ph
null
All the geometric phases, adiabatic and non-adiabatic, are formulated in a unified manner in the second quantized path integral formulation. The exact hidden local symmetry inherent in the Schr\"{o}dinger equation defines the holonomy. All the geometric phases are shown to be topologically trivial. The geometric phases are briefly compared to the chiral anomaly which is naturally formulated in the path integral.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 10:29:54 GMT" } ]
2017-08-23T00:00:00
[ [ "Fujikawa", "Kazuo", "" ] ]
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711.2584
Javier Trujillo Bueno
J. Trujillo Bueno and R. Manso Sainz
Remote Sensing of Chromospheric Magnetic Fields via the Hanle and Zeeman Effects
Invited keynote paper (14 pages and 5 figures)
Nuovo Cim.C25:783-796,2002
null
null
astro-ph
null
The only way to obtain reliable empirical information on the intensity and topology of the weak magnetic fields of the quiet solar chromosphere is via the measurement and rigorous physical interpretation of polarization signals in chromospheric spectral lines. The observed Stokes profiles reported here are due to the Hanle and Zeeman effects operating in a weakly magnetized plasma that is in a state far from local thermodynamic equilibrium. The physical origin of their enigmatic linear polarization Q and U components is the existence of atomic polarization in their metastable lower-levels, which permits the action of a dichroism mechanism that has nothing to do with the transverse Zeeman effect. It is also pointed out that the population imbalances and coherences among the Zeeman sublevels of such long-lived atomic levels can survive in the presence of horizontal magnetic fields having intensities in the gauss range, and produce significant polarization signals. Finally, it is shown how the most recent developments in the observation and theoretical modelling of weak polarization signals are facilitating fundamental new advances in our ability to investigate the magnetism of the outer solar atmosphere via spectropolarimetry.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 10:31:49 GMT" } ]
2011-04-12T00:00:00
[ [ "Bueno", "J. Trujillo", "" ], [ "Sainz", "R. Manso", "" ] ]
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711.2585
Petteri Kaski
Andreas Bj\"orklund, Thore Husfeldt, Petteri Kaski, Mikko Koivisto
Computing the Tutte polynomial in vertex-exponential time
null
null
null
null
cs.DS cond-mat.stat-mech math.CO
null
The deletion--contraction algorithm is perhaps the most popular method for computing a host of fundamental graph invariants such as the chromatic, flow, and reliability polynomials in graph theory, the Jones polynomial of an alternating link in knot theory, and the partition functions of the models of Ising, Potts, and Fortuin--Kasteleyn in statistical physics. Prior to this work, deletion--contraction was also the fastest known general-purpose algorithm for these invariants, running in time roughly proportional to the number of spanning trees in the input graph. Here, we give a substantially faster algorithm that computes the Tutte polynomial--and hence, all the aforementioned invariants and more--of an arbitrary graph in time within a polynomial factor of the number of connected vertex sets. The algorithm actually evaluates a multivariate generalization of the Tutte polynomial by making use of an identity due to Fortuin and Kasteleyn. We also provide a polynomial-space variant of the algorithm and give an analogous result for Chung and Graham's cover polynomial. An implementation of the algorithm outperforms deletion--contraction also in practice.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 10:51:10 GMT" }, { "version": "v2", "created": "Mon, 19 Nov 2007 10:41:46 GMT" }, { "version": "v3", "created": "Mon, 14 Jan 2008 16:06:31 GMT" }, { "version": "v4", "created": "Mon, 14 Apr 2008 10:31:54 GMT" } ]
2008-04-14T00:00:00
[ [ "Björklund", "Andreas", "" ], [ "Husfeldt", "Thore", "" ], [ "Kaski", "Petteri", "" ], [ "Koivisto", "Mikko", "" ] ]
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711.2586
Gillian Gehring
G. A. Gehring
Pressure Induced Quantum Phase Transitions
12 pages including figures
null
10.1209/0295-5075/82/60004
null
cond-mat.str-el
null
A quantum critical point is approached by applying pressure in a number of magnetic metals. The observed dependence of Tc on pressure necessarily means that the magnetic energy is coupled to the lattice. A first order phase transition occurs if this coupling exceeds a critical value: this is inevitable if diverges as Tc approaches zero. It is argued that this is the cause of the first order transition that is observed in many systems. Using Landau theory we obtain expressions for the boundaries of the region where phase separation occurs that agree well with experiments done on MnSi and other materials. The theory can be used to obtain very approximate values for the temperature and pressure at the tricritical point in terms of quantities measured at ambient pressure and the measured values of along the second order line. The values of the tricritical temperature for various materials obtained from Landau theory are too low but it is shown that the predicted values will rise if the effects of fluctuations are included.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 10:51:14 GMT" }, { "version": "v2", "created": "Thu, 22 May 2008 10:56:48 GMT" } ]
2009-11-13T00:00:00
[ [ "Gehring", "G. A.", "" ] ]
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711.2587
Andres Moya
A. Moya, J. Christensen-Dalsgaard, S. Charpinet, Y. Lebreton, A. Miglio, J. Montalban, M.J.P.F.G. Monteiro, J. Provost, I.W. Roxburgh, R. Scuflaire, J.C. Suarez, M. Suran
Inter-comparison of the g-, f- and p-modes calculated using different oscillation codes for a given stellar model
18 pages, 34 figures
Astrophys.SpaceSci.316:231-249,2008
10.1007/s10509-007-9717-z
null
astro-ph
null
In order to make astroseismology a powerful tool to explore stellar interiors, different numerical codes should give the same oscillation frequencies for the same input physics. This work is devoted to test, compare and, if needed, optimize the seismic codes used to calculate the eigenfrequencies to be finally compared with observations. The oscillation codes of nine research groups in the field have been used in this study. The same physics has been imposed for all the codes in order to isolate the non-physical dependence of any possible difference. Two equilibrium models with different grids, 2172 and 4042 mesh points, have been used, and the latter model includes an explicit modelling of semiconvection just outside the convective core. Comparing the results for these two models illustrates the effect of the number of mesh points and their distribution in particularly critical parts of the model, such as the steep composition gradient outside the convective core. A comprehensive study of the frequency differences found for the different codes is given as well. These differences are mainly due to the use of different numerical integration schemes. The use of a second-order integration scheme plus a Richardson extrapolation provides similar results to a fourth-order integration scheme. The proper numerical description of the Brunt-Vaisala frequency in the equilibrium model is also critical for some modes. An unexpected result of this study is the high sensitivity of the frequency differences to the inconsistent use of values of the gravitational constant (G) in the oscillation codes, within the range of the experimentally determined ones, which differ from the value used to compute the equilibrium model.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 10:53:53 GMT" } ]
2008-11-26T00:00:00
[ [ "Moya", "A.", "" ], [ "Christensen-Dalsgaard", "J.", "" ], [ "Charpinet", "S.", "" ], [ "Lebreton", "Y.", "" ], [ "Miglio", "A.", "" ], [ "Montalban", "J.", "" ], [ "Monteiro", "M. J. P. F. G.", "" ], [ "Provost", "J.", "" ], [ "Roxburgh", "I. W.", "" ], [ "Scuflaire", "R.", "" ], [ "Suarez", "J. C.", "" ], [ "Suran", "M.", "" ] ]
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711.2588
Joakim Arnlind
Joakim Arnlind, Martin Bordemann, Laurent Hofer, Jens Hoppe, Hidehiko Shimada
Noncommutative Riemann Surfaces
23 pages
null
null
null
math-ph hep-th math.MP
null
We introduce C-Algebras of compact Riemann surfaces $\Sigma$ as non-commutative analogues of the Poisson algebra of smooth functions on $\Sigma$. Representations of these algebras give rise to sequences of matrix-algebras for which matrix-commutators converge to Poisson-brackets as $N\to\infty$. For a particular class of surfaces, nicely interpolating between spheres and tori, we completely characterize (even for the intermediate singular surface) all finite dimensional representations of the corresponding C-algebras.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 10:59:21 GMT" } ]
2007-11-19T00:00:00
[ [ "Arnlind", "Joakim", "" ], [ "Bordemann", "Martin", "" ], [ "Hofer", "Laurent", "" ], [ "Hoppe", "Jens", "" ], [ "Shimada", "Hidehiko", "" ] ]
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711.2589
Nobuhito Maru
Nobuhito Maru and Nobuchika Okada
Gauge-Higgs Unification at LHC
16 pages, 4 figures, references added, a few comments added in the final part of the main text, a final version to appear in PRD
Phys.Rev.D77:055010,2008
10.1103/PhysRevD.77.055010
KOBE-TH-07-11, KEK-TH-1205
hep-ph
null
Higgs boson production by the gluon fusion and its decay into two photons at the LHC are investigated in the context of the gauge-Higgs unification scenario. The qualitative behaviors for these processes in the gauge-Higgs unification are quite distinguishable from those of the Standard Model and the universal extra dimension scenario because of the overall sign difference for the effective couplings induced by one-loop corrections through Kaluza-Klein (KK) modes. For the KK mode mass smaller than 1 TeV, the Higgs productions cross section and its branching ratio into two photons are sizably deviated from those in the Standard Model. Associated with the discovery of Higgs boson, this deviation may be measured at the LHC.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 11:00:17 GMT" }, { "version": "v2", "created": "Wed, 28 Nov 2007 04:34:41 GMT" }, { "version": "v3", "created": "Tue, 12 Feb 2008 15:23:06 GMT" } ]
2008-11-26T00:00:00
[ [ "Maru", "Nobuhito", "" ], [ "Okada", "Nobuchika", "" ] ]
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711.259
Andres Moya
A. Moya, R. Garrido
Granada oscillation Code (GraCo)
4 pages, 5 figures
Astrophys.SpaceSci.316:129-133,2008
10.1007/s10509-007-9694-2
null
astro-ph
null
Granada oscillation code (GraCo) is a software constructed to compute adiabatic and non-adiabatic oscillation eigenfunctions and eigenvalues. The adiabatic version gives the standard numerical resolution, and also the Richardson extrapolation, different sets of eigenfunctions, different outer mechanical boundary conditions or different integration variables. The non-adiabatic version can include the atmosphere-pulsation interaction. The code has been used for intensive studies of \delta Scuti, \gamma Doradus, \beta Ceph., SdO and, SdB stars. The non adiabatic observables ``phase-lag'' (the phase between the effective temperature variations and the radial displacement) and \delta T_{eff}/ T_{eff} (relative surface temperature variation) can help to the modal identification. These quantities together with the energy balance (``growth rate'') provide useful additional information to the adiabatic resolution (eigenfrequencies and eigenfunctions).
[ { "version": "v1", "created": "Fri, 16 Nov 2007 11:03:20 GMT" } ]
2008-11-26T00:00:00
[ [ "Moya", "A.", "" ], [ "Garrido", "R.", "" ] ]
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711.2591
Andrew Brooke-Taylor
Andrew D. Brooke-Taylor
Large Cardinals and Definable Well-Orderings of the Universe
18 pages, submitted with Kurt Goedel Centenary Research Prize Fellowship application
Journal of Symbolic Logic 74, no. 2 (June 2009) pp 641-654
10.2178/jsl/1243948331
null
math.LO
null
We use a reverse Easton forcing iteration to obtain a universe with a definable well-ordering, while preserving the GCH and proper classes of a variety of very large cardinals. This is achieved by coding using the principle diamond star at a proper class of successor cardinals.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 11:28:36 GMT" } ]
2012-02-28T00:00:00
[ [ "Brooke-Taylor", "Andrew D.", "" ] ]
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711.2592
Edgar A. Osorio
Edgar A. Osorio, Kevin O'Neill, Maarten Wegewijs, Nicolai Stuhr-Hansen, Jens Paaske, Thomas Bjornholm and Herre S.J. van der Zant
Electronic excitations of a single molecule contacted in a three-terminal configuration
Supporting information avalaible at http://pubs.acs.org
Nano lett. 2007, 7, 3336
10.1021/nl0715802
null
cond-mat.mes-hall cond-mat.mtrl-sci
null
Low-temperature three-terminal transport measurements through a thiol end-capped Pi -conjugated molecule have been carried out. Electronic excitations, including zero and finite-bias Kondo-effects have been observed and studied as a function of magnetic field. Using a simplified two-orbital model we have accounted for the spin and the electronic configuration of the first four charge states of the molecule. The charge-dependent couplings to gate, source and drain electrodes suggest a scenario in which charges and spins are localized at the ends of the molecule, close to the electrodes.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 11:36:28 GMT" } ]
2007-11-19T00:00:00
[ [ "Osorio", "Edgar A.", "" ], [ "O'Neill", "Kevin", "" ], [ "Wegewijs", "Maarten", "" ], [ "Stuhr-Hansen", "Nicolai", "" ], [ "Paaske", "Jens", "" ], [ "Bjornholm", "Thomas", "" ], [ "van der Zant", "Herre S. J.", "" ] ]
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711.2593
Geraldine Servant
Chiara Caprini, Ruth Durrer and Geraldine Servant
Gravitational wave generation from bubble collisions in first-order phase transitions: an analytic approach
48 pages, 14 figures. v2 (PRD version): calculation refined; plots redone starting from Fig. 4. Factor 2 in GW energy spectrum corrected. Main conclusions unchanged. v3: Note added at the end of paper to comment on the new results of 0901.1661
Phys.Rev.D77:124015,2008
10.1103/PhysRevD.77.124015
CERN-PH-TH/2007-206, SACLAY-T07/142
astro-ph gr-qc hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Gravitational wave production from bubble collisions was calculated in the early nineties using numerical simulations. In this paper, we present an alternative analytic estimate, relying on a different treatment of stochasticity. In our approach, we provide a model for the bubble velocity power spectrum, suitable for both detonations and deflagrations. From this, we derive the anisotropic stress and analytically solve the gravitational wave equation. We provide analytical formulae for the peak frequency and the shape of the spectrum which we compare with numerical estimates. In contrast to the previous analysis, we do not work in the envelope approximation. This paper focuses on a particular source of gravitational waves from phase transitions. In a companion article, we will add together the different sources of gravitational wave signals from phase transitions: bubble collisions, turbulence and magnetic fields and discuss the prospects for probing the electroweak phase transition at LISA.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 12:16:04 GMT" }, { "version": "v2", "created": "Tue, 22 Apr 2008 15:21:08 GMT" }, { "version": "v3", "created": "Tue, 13 Jan 2009 19:38:30 GMT" } ]
2009-01-13T00:00:00
[ [ "Caprini", "Chiara", "" ], [ "Durrer", "Ruth", "" ], [ "Servant", "Geraldine", "" ] ]
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711.2594
Chunxia Li
C.X. Li and J.J.C. Nimmo
Quasideterminant solutions of a non-Abelian Toda lattice and kink solutions of a matrix sine-Gordon equation
14 pages; 4 pictures
Proc.Roy.Soc.Lond.A464:951-966,2008
10.1098/rspa.2007.0321
null
nlin.SI
null
Two families of solutions of a generalized non-Abelian Toda lattice are considered. These solutions are expressed in terms of quasideterminants, constructed by means of Darboux and binary Darboux transformations. As an example of the application of these solutions, we consider the 2-periodic reduction to a matrix sine-Gordon equation. In particular, we investigate the interaction properties of polarized kink solutions.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 11:18:05 GMT" }, { "version": "v2", "created": "Sat, 22 Dec 2007 13:58:45 GMT" } ]
2008-11-26T00:00:00
[ [ "Li", "C. X.", "" ], [ "Nimmo", "J. J. C.", "" ] ]
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711.2595
Fabian Herrmann
Fabian Herrmann, Alexander V. Krivov
Effects of photophoresis on the evolution of transitional circumstellar disks
13 pages, 10 figures. Accepted for publication on 1 October 2007
null
10.1051/0004-6361:20078322
null
astro-ph
null
Although known for almost a century, the photophoretic force has only recently been considered in astrophysical context for the first time. In our work, we have examined the effect of photophoresis, acting together with stellar gravity, radiation pressure, and gas drag, on the evolution of solids in transitional circumstellar disks. We have applied our calculations to four different systems: the disks of HR 4796A and HD 141569A, which are several Myr old AB-type stars, and two hypothetical systems that correspond to the solar nebula after disk dispersal has progressed sufficiently for the disk to become optically thin. Our results suggest that solid objects migrate inward or outward, until they reach a certain size-dependent stability distance from the star. The larger the bodies, the closer to the star they tend to accumulate. Photophoresis increases the stability radii, moving objects to larger distances. What is more, photophoresis may cause formation of a belt of objects, but only in a certain range of sizes and only around low-luminosity stars. The effects of photophoresis are noticeable in the size range from several micrometers to several centimeters (for older transitional disks) or even several meters (for younger, more gaseous, ones). We argue that due to gas damping, rotation does not substantially inhibit photophoresis.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 11:56:12 GMT" } ]
2009-11-13T00:00:00
[ [ "Herrmann", "Fabian", "" ], [ "Krivov", "Alexander V.", "" ] ]
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711.2596
Linda Podio
L. Podio, P. J. V. Garcia, F. Bacciotti, S. Antoniucci, B. Nisini, C. Dougados, M. Takami
Tracing the origins of permitted emission lines in RU Lupi down to AU scales
11 pages, 4 figures, accepted for publication on A&A
null
10.1051/0004-6361:20078694
null
astro-ph
null
Most of the observed emission lines and continuum excess from young accreting low mass stars (Classical T Tauri stars -- CTTSs) take place in the star-disk or inner disk region. These regions have a complex emission topology still largely unknown. In this paper the magnetospheric accretion and inner wind contributions to the observed permitted He and H near infrared (NIR) lines of the bright southern CTTS RU Lupi are investigated for the first time. Previous optical observations of RU Lupi showed a large H-alpha profile, due to the emission from a wind in the line wings, and a micro-jet detected in forbidden lines. We extend this analysis to NIR lines through seeing-limited high spectral resolution spectra taken with VLT/ISAAC, and adaptive optics (AO) aided narrow-band imaging and low spectral resolution spectroscopy with VLT/NACO. Using spectro-astrometric analysis we investigate the presence of extended emission down to very low spatial scales (a few AU). The HeI 10830 line presents a P Cygni profile whose absorption feature indicates the presence of an inner stellar wind. Moreover the spectro-astrometric analysis evidences the presence of an extended emission superimposed to the absorption feature and likely coming from the micro-jet detected in the optical. On the contrary, the origin of the Hydrogen Paschen and Brackett lines is difficult to address. We tried tentatively to explain the observed line profiles and flux ratios with both accretion and wind models showing the limits of both approaches. The lack of spectro-astrometric signal indicates that the HI emission is either compact or symmetric. Our analysis confirms the sensitivity of the HeI line to the presence of faint extended emission regions in the close proximity of the star.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 11:33:44 GMT" } ]
2009-11-13T00:00:00
[ [ "Podio", "L.", "" ], [ "Garcia", "P. J. V.", "" ], [ "Bacciotti", "F.", "" ], [ "Antoniucci", "S.", "" ], [ "Nisini", "B.", "" ], [ "Dougados", "C.", "" ], [ "Takami", "M.", "" ] ]
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711.2597
Nickolay Chernikov
N.S.Chernikov
A note on groups with the minimal conditions for nonabelian and abelian subgroups
4 pages
null
null
null
math.GR
null
We give a new proof of the known Shunkov's Theorem on locally finite groups with the minimal condition for nonabelian subgroups and also an extension of the known Suchkova-Shunkov Theorem on Shunkov groups with the minimal condition for abelian subgroups.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 11:54:05 GMT" } ]
2007-11-19T00:00:00
[ [ "Chernikov", "N. S.", "" ] ]
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711.2598
Margaret Harris
M. L. Harris, P. Tierney, S. L. Cornish
Magnetic trapping of a cold Rb-Cs atomic mixture
16 pages, 5 figures Added references, corrected typos, minor changes to figures and text
null
10.1088/0953-4075/41/3/035303
null
cond-mat.other
null
We present an apparatus for the study of an ultracold gaseous atomic mixture of 133Cs and 87Rb. The mixture is prepared using a double magneto-optical trap (MOT) system in which a two-species pyramid MOT acts as a source of cold atoms for a `science' MOT. Measurements of the interspecies trap loss rate coefficients beta_RbCs and beta_CsRb in the science MOT are reported. After the initial MOT phase, atoms in the mixture are optically pumped into the magnetically trappable |F=3,m_F=-3> and |F=1,m_F=-1> states of Cs and Rb (respectively) and loaded into an Ioffe-Pritchard magnetic trap. We demonstrate a novel technique for limiting the interspecies loss rate in the science MOT by spatially separating the two trapped atom clouds, which greatly enhances the number of atoms which can be loaded into the magnetic trap.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 12:50:48 GMT" }, { "version": "v2", "created": "Wed, 23 Jan 2008 18:33:12 GMT" } ]
2009-11-13T00:00:00
[ [ "Harris", "M. L.", "" ], [ "Tierney", "P.", "" ], [ "Cornish", "S. L.", "" ] ]
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711.2599
Si-Qi Liu
Si-Qi Liu, Chao-Zhong Wu, Youjin Zhang
On Properties of Hamiltonian Structures for a Class of Evolutionary PDEs
17 pages
null
10.1007/s11005-008-0234-y
null
nlin.SI math-ph math.DG math.MP
null
In \cite{LZ2} it is proved that for certain class of perturbations of the hyperbolic equation $u_t=f(u) u_x$, there exist changes of coordinate, called quasi-Miura transformations, that reduce the perturbed equations to the unperturbed one. We prove in the present paper that if in addition the perturbed equations possess Hamiltonian structures of certain type, the same quasi-Miura transformations also reduce the Hamiltonian structures to their leading terms. By applying this result, we obtain a criterion of the existence of Hamiltonian structures for a class of scalar evolutionary PDEs and an algorithm to find out the Hamiltonian structures.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 12:10:53 GMT" }, { "version": "v2", "created": "Sun, 18 Nov 2007 14:07:43 GMT" } ]
2009-11-13T00:00:00
[ [ "Liu", "Si-Qi", "" ], [ "Wu", "Chao-Zhong", "" ], [ "Zhang", "Youjin", "" ] ]
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711.26
Masato Yamanaka
Shigeki Matsumoto, Joe Sato, Masato Senami, and Masato Yamanaka
The neutrino masses and the change of allowed parameter region in universal extra dimension models
3 pages, to appear in the conference proceedings of TAUP 2007
J.Phys.Conf.Ser.120:042007,2008
10.1088/1742-6596/120/4/042007
null
hep-ph
null
Relic abundance of dark matter is investigated in the framework of universal extra dimension models with right-handed neutrinos. These models are free from the serious Kaluza-Klein (KK) graviton problem that the original universal extra dimension model possesses. The first KK particle of the right-handed neutrino is a candidate for dark matter in this framework. When ordinary neutrino masses are large enough such as the degenerate mass spectrum case, the dark matter relic abundance can change significantly. The scale of the extra dimension consistent with cosmological observations can be 500 GeV in the minimal setup of universal extra dimension models with right-handed neutrinos.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 12:10:32 GMT" } ]
2008-11-26T00:00:00
[ [ "Matsumoto", "Shigeki", "" ], [ "Sato", "Joe", "" ], [ "Senami", "Masato", "" ], [ "Yamanaka", "Masato", "" ] ]
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711.2601
Carsten Patrick Achenbach
Patrick Achenbach
Probing hypernuclei at PANDA and at MAMI-C
Proc. of IX Intern. Conference on Hypernuclear and Strange Particle Physics (HYP 2006), Mainz, Germany, 10-14 Oct 2006
null
null
null
nucl-ex
null
Spectroscopy of Lambda hypernuclei has recently become one of the most valuable tools for the experimental investigation of strangeness nuclear physics. Several new approached are being pursued currently: In Mainz, the Microtron MAMI has been upgraded to 1.5 GeV electron beam energy and will be used to produce strange hadronic systems in the near future. The KaoS spectrometer is being installed for large acceptance, high resolution strangeness reaction spectroscopy at the existing spectrometer facility. The Mainz hypernuclei research programme will be complemented by experiments on multi-strange systems at the planned FAIR facility at GSI. The gamma-ray spectroscopy of double Lambda hypernuclei produced via Xi-bar Xi pair production is one of the four main topics which will be addressed by the PANDA Collaboration. In this paper the status of the planned experiments and the future prospects are presented.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 12:37:24 GMT" } ]
2007-11-19T00:00:00
[ [ "Achenbach", "Patrick", "" ] ]
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711.2602
Soontorn Chanyawadee
S. Chanyawadee, P. G. Lagoudakis, R. T. Harley, D. G. Lidzey and M. Henini
Non-radiative exciton energy transfer in hybrid organic-inorganic heterostructures
null
null
10.1103/PhysRevB.77.193402
null
cond-mat.other
null
Non-radiative optical energy transfer from a GaAs quantum well to a thin overlayer of an infrared organic semiconductor dye is unambiguously demonstrated. The dynamics of exciton transfer are studied in the time-domain using pump-probe spectroscopy at the donor site and fluorescence spectroscopy at the acceptor site. The effect is observed as simultaneous increase of the population decay rate at the donor and of the rise time of optical emission at the acceptor sites. The hybrid configuration under investigation provides an alternative non-radiative, non-contact pumping route to electrical carrier injection that overcomes the losses imposed by the associated low carrier mobility of organic emitters.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 12:31:45 GMT" } ]
2009-11-13T00:00:00
[ [ "Chanyawadee", "S.", "" ], [ "Lagoudakis", "P. G.", "" ], [ "Harley", "R. T.", "" ], [ "Lidzey", "D. G.", "" ], [ "Henini", "M.", "" ] ]
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711.2603
Jens Hasper
J. Hasper, S. M\"uller, D. Savran, L. Schnorrenberger, K. Sonnabend, and A. Zilges
Investigation of photoneutron reactions close to and above the neutron emission threshold in the rare earth region
Accepted for publication in Physical Review C
Phys.Rev.C77:015803,2008
10.1103/PhysRevC.77.015803
null
astro-ph
null
We have investigated the photoneutron cross section of the isotopes $^{148,150}$Nd, $^{154}$Sm, and $^{154,160}$Gd close to the neutron emission threshold in photoactivation experiments at the Darmstadt superconducting electron linear accelerator S-DALINAC. Naturally composed targets were activated with a high-intensity bremsstrahlung beam at various energies and the reaction yields have been determined by measuring the activity of the produced radioactive isotopes with HPGe detectors. The results are compared to two different statistical model calculations.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 12:34:11 GMT" } ]
2008-11-26T00:00:00
[ [ "Hasper", "J.", "" ], [ "Müller", "S.", "" ], [ "Savran", "D.", "" ], [ "Schnorrenberger", "L.", "" ], [ "Sonnabend", "K.", "" ], [ "Zilges", "A.", "" ] ]
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711.2604
David Harrington
D.M. Harrington, J.R. Kuhn
The Near-Star Environment: Spectropolarimetry of Herbig Ae/Be Stars
4 pages, 2 figues, Bioastronomy 2007 conference proceedings
null
null
null
astro-ph
null
The near-star environment around young stars is very dynamic with winds, disks, and outflows. These processes are involved in star and planet formation, and influence the formation and habitability of planets around host stars. Even for the closest young stars, this will not be imaged even after the completion of the next generation of telescopes decades from now and other proxies must be used. The polarization of light across individual spectral lines is such a proxy that contains information about the geometry and density of circumstellar material on these small spatial scales. We have recently built a high-resolution spectropolarimeter (R~13000 to 50000) for the HiVIS spectrograph on the 3.67m AEOS telescope. We used this instrument to monitor several young intermediate-mass stars over many nights. These observations show clear spectropolarimetric signatures typically centered on absorptive components of the spectral lines, with some signatures variable in time. The survey also confirms the large spectroscopic variability in these stars on timescales of minutes to months, and shows the dyamic bullets and streamers in the stellar winds. These observations were largely inconsistent with the traditional scattering models and inspired the development of a new explanation of their polarization, based on optical-pumping, that has the potential to provide direct measurements of the circumstellar gas properties.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 20:33:59 GMT" } ]
2007-11-19T00:00:00
[ [ "Harrington", "D. M.", "" ], [ "Kuhn", "J. R.", "" ] ]
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711.2605
Gregory Price
Gregory N. Price and Erik D. Demaine
Generalized D-Forms Have No Spurious Creases
revised
null
null
null
cs.CG
http://creativecommons.org/licenses/by/3.0/
A convex surface that is flat everywhere but on finitely many smooth curves (or "seams") and points is a seam form. We show that the only creases through the flat components of a seam form are either between vertices or tangent to the seams. As corollaries we resolve open problems about certain special seam forms: the flat components of a D-form have no creases at all, and the flat component of a pita-form has at most one crease, between the seam's endpoints.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 20:58:57 GMT" }, { "version": "v2", "created": "Thu, 7 May 2009 05:45:19 GMT" } ]
2009-05-07T00:00:00
[ [ "Price", "Gregory N.", "" ], [ "Demaine", "Erik D.", "" ] ]
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711.2606
Olaf Behnke
H1-Collaboration
Three- and Four-jet Production at Low x at HERA
35 pages, 12 figures
Eur.Phys.J.C54:389-409,2008
10.1140/epjc/s10052-008-0544-3
DESY 07-200
hep-ex
null
Three- and four-jet production is measured in deep-inelastic $ep$ scattering at low $x$ and $Q^2$ with the H1 detector using an integrated luminosity of $44{.}2 {\rm pb}^{-1}$. Several phase space regions are selected for the three-jet analysis in order to study the underlying parton dynamics from global topologies to the more restrictive regions of forward jets close to the proton direction. The measurements of cross sections for events with at least three jets are compared to fixed order QCD predictions of ${\mathcal{O}}(\alpha_{\rm s}^2)$ and ${\mathcal{O}}(\alpha_{\rm s}^3) $ and with Monte Carlo simulation programs where higher order effects are approximated by parton showers. A good overall description is provided by the ${\mathcal{O}}(\alpha_{\rm s}^3) $ calculation. Too few events are predicted at the lowest $x \sim 10^{-4}$, especially for topologies with two forward jets. This hints to large contributions at low $x$ from initial state radiation of gluons close to the proton direction and unordered in transverse momentum. The Monte Carlo program in which gluon radiation is generated by the colour dipole model gives a good description of both the three- and the four-jet data in absolute normalisation and shape.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 13:33:02 GMT" } ]
2010-03-19T00:00:00
[ [ "H1-Collaboration", "", "" ] ]
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711.2607
Halton Arp
H. Arp
Quasars and the Hubble Relation
10 pages, 5 figures
null
null
null
astro-ph
null
If active galaxies are defined as extragalactic objects with appreciably non thermal spectra then a continuity exists in redshift from the highest redshift quasars to low redshift Seyferts, AGNs and allied galaxies. Evidence is discussed for this sequence to be an evolutionary track with objects evolving from high to low intrinsic redshift with time. At the end of this evolution the objects are nearly the same age as our own galaxy and they come to rest on the traditional Hubble relation.
[ { "version": "v1", "created": "Fri, 16 Nov 2007 13:06:32 GMT" } ]
2007-11-19T00:00:00
[ [ "Arp", "H.", "" ] ]
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