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711.4808
Frank Avignone III
F.T. Avignone III (for the Majorana Collaboration)
The MAJORANA 76Ge neutrino less double-beta decay project: A brief update
3 pages, no figures
J.Phys.Conf.Ser.120:052059,2008
10.1088/1742-6596/120/5/052059
null
nucl-ex
null
At present, MAJORANA is a research and development (R&D) project to investigate the feasibility and cost of constructing and operating a one ton decay experiment with ~1000 kg of Ge detectors fabricated from germanium enriched to 86% in . The study will include three separate cryostats with various types of detectors: un-segmented, un-segmented point-contact, minimally segmented, and highly segmented. One cryostat will contain at least 30 kg of enriched (preferably point-contact) detectors. The performance of the cryostats and detectors as well as background levels will be investigated. The goal of the demonstrator project is to reach a discovery sensitivity of ~ 1026 y.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 19:40:56 GMT" } ]
2019-08-13T00:00:00
[ [ "Avignone", "F. T.", "III", "for the Majorana Collaboration" ] ]
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711.4809
Eero Saksman
Ilkka Norros and Eero Saksman
Local independence of fractional Brownian motion
17 pages
null
null
null
math.PR cs.IT math.IT
null
Let S(t,t') be the sigma-algebra generated by the differences X(s)-X(s) with s,s' in the interval(t,t'), where (X_t) is the fractional Brownian motion process with Hurst index H between 0 and 1. We prove that for any two distinct t and t' the sigma-algebras S(t-a,t+a) and S(t'-a,t'+a) are asymptotically independent as a tends to 0. We show this in the strong sense that Shannon's mutual information between these two sigma-algebras tends to zero as a tends to 0. Some generalizations and quantitative estimates are provided also.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 19:41:19 GMT" } ]
2007-11-30T00:00:00
[ [ "Norros", "Ilkka", "" ], [ "Saksman", "Eero", "" ] ]
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711.481
Fulvio Melia
Fulvio Melia
Dark Energy in Light of the Cosmic Horizon
Submitted to MNRAS
null
null
null
astro-ph gr-qc hep-ph hep-th
null
Based on dramatic observations of the CMB with WMAP and of Type Ia supernovae with the Hubble Space Telescope and ground-based facilities, it is now generally believed that the Universe's expansion is accelerating. Within the context of standard cosmology, the Universe must therefore contain a third `dark' component of energy, beyond matter and radiation. However, the current data are still deemed insufficient to distinguish between an evolving dark energy component and the simplest model of a time-independent cosmological constant. In this paper, we examine the role played by our cosmic horizon R0 in our interrogation of the data, and reach the rather firm conclusion that the existence of a cosmological constant is untenable. The observations are telling us that R0=c t0, where t0 is the perceived current age of the Universe, yet a cosmological constant would drive R0 towards ct (where t is the cosmic time) only once, and that would have to occur right now. In contrast, scaling solutions simultaneously eliminate several conundrums in the standard model, including the `coincidence' and `flatness' problems, and account very well for the fact that R0=c t0. We show here that for such dynamical dark energy models, either R0=ct for all time (thus eliminating the apparent coincidence altogether), or that what we believe to be the current age of the universe is actually the horizon time th=R0/c, which is always shorter than t0. Our best fit to the Type Ia supernova data indicates that t0 would then have to be ~16.9 billion years. Though surprising at first, an older universe such as this would actually eliminate several other long-standing problems in cosmology, including the (too) early appearance of supermassive black holes (at a redshift > 6) and the glaring deficit of dwarf halos in the local group.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 19:50:17 GMT" } ]
2007-11-30T00:00:00
[ [ "Melia", "Fulvio", "" ] ]
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711.4811
Bijunath Patla
Bijunath Patla and Robert J. Nemiroff
Gravitational Lensing Characteristics of the Transparent Sun
null
null
10.1086/588805
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The transparent Sun is modeled as a spherically symmetric and centrally condensed gravitational lens using recent Standard Solar Model (SSM) data. The Sun's minimum focal length is computed to a refined accuracy of 23.5 +/- 0.1 AU, just beyond the orbit of Uranus. The Sun creates a single image of a distant point source visible to observers inside this minimum focal length and to observers sufficiently removed from the line connecting the source through the Sun's center. Regions of space are mapped where three images of a distant point source are created, along with their associated magnifications. Solar caustics, critical curves, and Einstein rings are computed and discussed. Extremely high gravitational lens magnifications exist for observers situated so that an angularly small, unlensed source appears near a three-image caustic. Types of radiations that might undergo significant solar lens magnifications as they can traverse the core of the Sun, including neutrinos and gravitational radiation, are discussed.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 19:59:08 GMT" }, { "version": "v2", "created": "Mon, 12 Dec 2011 18:50:37 GMT" } ]
2011-12-13T00:00:00
[ [ "Patla", "Bijunath", "" ], [ "Nemiroff", "Robert J.", "" ] ]
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711.4812
Brian Storey
Brian D. Storey, Lee R. Edwards, Mustafa Sabri Kilic, and Martin Z. Bazant
High-frequency flow reversal of AC electro-osmosis due to steric effects
12 pages
null
null
null
cond-mat.other
null
The current theory of alternating-current electro-osmosis (ACEO) is unable to explain the experimentally observed flow reversal of planar ACEO pumps at high frequency (above the peak, typically 10-100 kHz), low salt concentration (1-1000 $\mu$M), and moderate voltage (2-6 V), even if taking into account Faradaic surface reactions, nonlinear double-layer capacitance and bulk electrothermal flows. We attribute this failure to the breakdown of the classical Poisson-Boltzmann model of the diffuse double layer, which assumes a dilute solution of point-like ions. In spite of low bulk salt concentration, the large voltage induced across the double layer leads to crowding of the ions and a related decrease in surface capacitance. Using several mean-field models for finite-sized ions, we show that steric effects generally lead to high frequency flow reversal of ACEO pumps, similar to experiments. For quantitative agreement, however, an unrealistically large effective ion size (several nm) must be used, which we attribute to neglected correlation effects.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 20:07:54 GMT" } ]
2007-11-30T00:00:00
[ [ "Storey", "Brian D.", "" ], [ "Edwards", "Lee R.", "" ], [ "Kilic", "Mustafa Sabri", "" ], [ "Bazant", "Martin Z.", "" ] ]
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711.4813
Niklas Beisert
Niklas Beisert and Denis Erkal
Yangian Symmetry of Long-Range gl(N) Integrable Spin Chains
27 pages, v2: minor changes, references added, figures updated, v3: minor corrections, references added, to appear in JSTAT
J.Stat.Mech.0803:P03001,2008
10.1088/1742-5468/2008/03/P03001
AEI-2007-166, EFI-07-36, PUTP-2234
hep-th
null
An interesting type of spin chain has appeared in the context of the planar AdS/CFT correspondence: It is based on an integrable nearest-neighbor spin chain, and it is perturbatively deformed by long-range interactions which apparently preserve the integrable structure. Similar models can be constructed by demanding the existence of merely one conserved local charge. Although the latter is not a sufficient integrability condition in general, the models often display convincing signs of full integrability. Here we consider a class of long-range spin chains with spins transforming in the fundamental representation of gl(N). For the most general such model with one conserved local charge we construct a conserved Yangian generator and show that it obeys the Serre relations. We thus provide a formal proof of integrability for this class of models.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 20:18:46 GMT" }, { "version": "v2", "created": "Tue, 15 Jan 2008 15:04:11 GMT" }, { "version": "v3", "created": "Thu, 28 Feb 2008 07:50:07 GMT" } ]
2008-11-26T00:00:00
[ [ "Beisert", "Niklas", "" ], [ "Erkal", "Denis", "" ] ]
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711.4814
Robert Wicks
R. T. Wicks, S. C. Chapman, R. O. Dendy
Solar cycle dependence of spatial correlation in the solar wind
4 pages, 4 figures, will be presented at Fall AGU 2007
The Astrophysical Journal, 690, 734-742, 2009 January 1
10.1088/0004-637X/690/1/734
null
physics.space-ph astro-ph.SR physics.geo-ph physics.plasm-ph
null
We investigate the spatial correlation properties of the solar wind using simultaneous observations by the ACE and WIND spacecraft. We use mutual information as a nonlinear measure of correlation and compare this to linear correlation. We find that the correlation lengthscales of fluctuations in density and magnetic field magnitude vary strongly with the solar cycle, whereas correlation lengths of fluctuations in B field components do not. We find the correlation length of |B| ~ 120 Re at solar minimum and ~ 270 Re at maximum and the correlation length of density ~ 75 Re at minimum and ~ 170 Re at minimum. The components of the B field have correlation lengths ~ correlation length |B| at minimum.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 20:25:07 GMT" }, { "version": "v2", "created": "Mon, 3 Dec 2007 21:46:23 GMT" } ]
2010-02-11T00:00:00
[ [ "Wicks", "R. T.", "" ], [ "Chapman", "S. C.", "" ], [ "Dendy", "R. O.", "" ] ]
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711.4815
Nozomu Tominaga
Nozomu Tominaga
Aspherical Properties of Hydrodynamics and Nucleosynthesis in Jet-induced Supernovae
12 pages, 11 figures. Accepted for publication in the Astrophysical Journal
Astrophys.J.690:526-536,2009
10.1088/0004-637X/690/1/526
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Jet-induced supernovae (SNe) have been suggested to occur in gamma-ray bursts (GRBs) and highly-energetic SNe (hypernovae). I investigate hydrodynamical and nucleosynthetic properties of the jet-induced explosion of a population III $40_\odot$ star with a two-dimensional special relativistic hydrodynamical code. The abundance distribution after the explosion and the angular dependence of the yield are obtained for the models with high and low energy deposition rates $\dot{E}_{\rm dep}=120\times10^{51} {\rm ergs s^{-1}}$ and $1.5\times10^{51} {\rm ergs s^{-1}}$. The ejection of Fe-peak products and the fallback of unprocessed materials in the jet-induced SNe account for the abundance patterns of the extremely metal-poor (EMP) stars. It is also found that the peculiar abundance pattern of a Si-deficient metal-poor star HE 1424--0241 is reproduced by the angle-delimited yield for $\theta=30^\circ-35^\circ$ of the model with $\dot{E}_{\rm dep}=120\times10^{51} {\rm ergs s^{-1}}$. Furthermore, I compare the yield of the jet-induced explosion with that of the spherical explosion and confirm the ejection and fallback in the jet-induced explosion is almost equivalent to the "mixing-fallback" in spherical explosions. In contrast to the spherical models, however, the high-entropy environment is realized in the jet-induced explosion and thus [(Sc, Ti, V, Cr, Co, Zn)/Fe] are enhanced. The enhancements of [Sc/Fe] and [Ti/Fe] improve agreements with the abundance patterns of the EMP stars.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 20:18:44 GMT" }, { "version": "v2", "created": "Tue, 26 Aug 2008 15:56:49 GMT" } ]
2008-12-18T00:00:00
[ [ "Tominaga", "Nozomu", "" ] ]
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711.4816
Shadyar Farhangfar
Shadyar Farhangfar
Quantum size effects in solitary wires of bismuth
5 pages, 6 figures, and the LaTeX source
Phys. Rev. B 76, 205437 (2007)
10.1103/PhysRevB.76.205437
null
cond-mat.mes-hall
null
We have performed four-probe electrical transport measurements on solitary highly crystalline wires of semimetallic bismuth with aspect ratios up to 60 at room and at cryogenic temperatures. By proper choice of the substrate material and the film deposition parameters, lithographic wires with lateral dimensions of down to one single grain, $\sim 250$ nm, were fabricated. The electrical resistance of each wire was measured against its thickness through successive reactive ion etching of the self-same wire. Quantum size effects revealed themselves as regular oscillations in the electrical resistance. Some evidence for the semimetal-to-semiconductor phase transition has been detected. The measured data are discussed within the framework of the existing theoretical models.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 20:20:10 GMT" } ]
2007-11-30T00:00:00
[ [ "Farhangfar", "Shadyar", "" ] ]
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711.4817
Borun Chowdhury
Borun D. Chowdhury, Samir D. Mathur
Radiation from the non-extremal fuzzball
corrected typos
Class.Quant.Grav.25:135005,2008
10.1088/0264-9381/25/13/135005
null
hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The fuzzball proposal says that the information of the black hole state is distributed throughout the interior of the horizon in a `quantum fuzz'. There are special microstates where in the dual CFT we have `many excitations in the same state'; these are described by regular classical geometries without horizons. Jejjala et.al constructed non-extremal regular geometries of this type. Cardoso et. al then found that these geometries had a classical instability. In this paper we show that the energy radiated through the unstable modes is exactly the Hawking radiation for these microstates. We do this by (i) starting with the semiclassical Hawking radiation rate (ii) using it to find the emission vertex in the CFT (iii) replacing the Boltzman distributions of the generic CFT state with the ones describing the microstate of interest (iv) observing that the emission now reproduces the classical instability. Because the CFT has `many excitations in the same state' we get the physics of a Bose-Einstein condensate rather than a thermal gas, and the usually slow Hawking emission increases, by Bose enhancement, to a classically radiated field. This system therefore provides a complete gravity description of information-carrying radiation from a special microstate of the nonextremal hole.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 20:22:36 GMT" }, { "version": "v2", "created": "Thu, 6 Dec 2007 03:09:58 GMT" }, { "version": "v3", "created": "Fri, 27 Jun 2008 23:49:11 GMT" } ]
2008-11-26T00:00:00
[ [ "Chowdhury", "Borun D.", "" ], [ "Mathur", "Samir D.", "" ] ]
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711.4818
Ronald Reid-Edwards
C. M. Hull, and R. A. Reid-Edwards
Gauge Symmetry, T-Duality and Doubled Geometry
16 pages
JHEP 0808:043,2008
10.1088/1126-6708/2008/08/043
Imperial/TP/2007/CH/03, DESY-07-189, ZMP-HH/07-11
hep-th
null
String compactifications with T-duality twists are revisited and the gauge algebra of the dimensionally reduced theories calculated. These reductions can be viewed as string theory on T-fold backgrounds, and can be formulated in a `doubled space' in which each circle is supplemented by a T-dual circle to construct a geometry which is a doubled torus bundle over a circle. We discuss a conjectured extension to include T-duality on the base circle, and propose the introduction of a dual base coordinate, to give a doubled space which is locally the group manifold of the gauge group. Special cases include those in which the doubled group is a Drinfel'd double. This gives a framework to discuss backgrounds that are not even locally geometric.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 20:25:13 GMT" } ]
2009-12-15T00:00:00
[ [ "Hull", "C. M.", "" ], [ "Reid-Edwards", "R. A.", "" ] ]
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711.4819
Donie O'Brien
D. S. O'Brien
A study of polarization buildup by spin filtering
10 pages, 2 figures, presented at the Polarized Antiproton Beams - How? workshop, Cockcroft Institute, UK. August 2007
AIPConf.Proc.1008:24-33,2008
10.1063/1.2932263
null
hep-ph
null
Many sets of polarization evolution equations have been suggested to describe the method of polarization buildup by spin filtering in storage rings. In this paper a generic system of polarization evolution equations describing spin filtering is derived and solved, then we compare and contrast this system to other descriptions of spin filtering appearing in the literature. This is of interest to projects planning to produce a polarized antiproton beam by spin filtering, and to any project utilizing spin filtering in storage rings. The physical processes responsible for spin filtering are analysed and their contributions to the dynamics of polarization buildup are highlighted. It is hoped that this will shed light on some of the confusion in the literature.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 20:25:18 GMT" } ]
2008-11-26T00:00:00
[ [ "O'Brien", "D. S.", "" ] ]
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711.482
Narendra Sahu
John McDonald, Narendra Sahu and Utpal Sarkar
Type-II Seesaw at Collider, Lepton Asymmetry and Singlet Scalar Dark Matter
8 pages, double column, references are added, minor change in title, section-III is revised, one figure is added, typos are corrected
JCAP 0804:037,2008
10.1088/1475-7516/2008/04/037
null
hep-ph astro-ph
null
We propose an extension of the standard model with a B-L global symmetry that is broken softly at the TeV scale. The neutrinos acquire masses through a type-II seesaw while the lepton (L) asymmetry arises in the {\it singlet sector} but without B-L violation. The model has the virtue that the scale of L-number violation ($\Lambda$) giving rise to neutrino masses is independent of the scale of leptogenesis ($\Lambda'$). As a result the model can explain {\it neutrino masses, singlet scalar dark matter and leptogenesis at the TeV scale}. The stability of the dark matter is ensured by a surviving $Z_2$ symmetry, which could be lifted at the Planck scale and thereby allowing Planck scale-suppressed decay of singlet scalar dark matter particles of mass $\approx 3$ MeV to $e^+ e^-$ pairs in the Galactic halo. The model also predicts a few hundred GeV doubly charged scalar and a long lived charged fermion, whose decay can be studied at Large Hadron Collider (LHC) and International Linear Collider (ILC).
[ { "version": "v1", "created": "Thu, 29 Nov 2007 20:27:27 GMT" }, { "version": "v2", "created": "Fri, 7 Mar 2008 16:33:17 GMT" } ]
2010-05-27T00:00:00
[ [ "McDonald", "John", "" ], [ "Sahu", "Narendra", "" ], [ "Sarkar", "Utpal", "" ] ]
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711.4821
Elias Katsoulis
Kenneth R. Davidson, Elias G. Katsoulis
Semicrossed products of simple C*-algebras
12 pages, accepted for publication in Math. Ann
Math. Ann. 342 (2008), 515-525
null
null
math.OA math.FA
null
Let $(\A, \alpha)$ and $(\B, \beta)$ be C*-dynamical systems and assume that $\A$ is a separable simple C*-algebra and that $\alpha$ and $\beta$ are *-automorphisms. Then the semicrossed products $\A \times_{\alpha} \bbZ^{+}$ and $\B \times_{\beta} \bbZ^{+}$ are isometrically isomorphic if and only if the dynamical systems $(\A, \alpha)$ and $(\B, \beta)$ are outer conjugate.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 20:41:42 GMT" }, { "version": "v2", "created": "Fri, 21 Mar 2008 17:59:57 GMT" } ]
2009-02-10T00:00:00
[ [ "Davidson", "Kenneth R.", "" ], [ "Katsoulis", "Elias G.", "" ] ]
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711.4822
Nico Cappelluti
H. Brunner, N. Cappelluti, G. Hasinger, X. Barcons, A. C. Fabian, V. Mainieri and G. Szokoly
XMM-Newton observations of the Lockman Hole: X-ray source catalogue and number counts
20 pages, 12 figures, source catalogue. Some figures compressed. Accepted by Astronomy and Astrophysics on 11/27/2007. Machine readable version on Vizie-R
null
10.1051/0004-6361:20077687
null
astro-ph
null
The Lockman Hole field represents the sky area of lowest Galactic line-of-sight column density N_H=5.7X10^19 cm^-2. It was observed by the XMM-Newton X-ray observatory in 18 pointings for a total of 1.16 Msec (raw EPIC pn observing time) constituting the deepest XMM-Newton exposure so far. We present a catalogue of the X-ray sources detected in the central 0.196 deg^2 of the field and discuss the derived number counts and X-ray colours. In the 0.5--2.0 keV band, a sensitivity limit (defined as the faintest detectable source)of 1.9X10^-16 erg cm^-2 s^-1 was reached. The 2.0--10.0 keV band and 5.0--10.0 keV band sensitivity limits were 9X10^-16 erg cm^-2 s^-1 and 1.8X10^-15 erg cm^-2 s^-1, respectively.A total of 409 sources above a detection likelihood of 10 (3.9 sigma) were found within a radius of 15' off the field centre, of which 340, 266, and 98 sources were detected in the soft, hard, and very hard bands, respectively. The number counts in each energy band are in close agreement with results from previous surveys and with the synthesis models of the X-ray background. A 6% of Compton-thick source candidates have been selected from the X-ray colour-colour diagram. This fraction is consistent with the most recent predictions of X-ray background population synthesis models at our flux limits. We also estimated, for the first time, the logN-logS relation for Compton-thick AGN.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 22:33:43 GMT" } ]
2009-11-13T00:00:00
[ [ "Brunner", "H.", "" ], [ "Cappelluti", "N.", "" ], [ "Hasinger", "G.", "" ], [ "Barcons", "X.", "" ], [ "Fabian", "A. C.", "" ], [ "Mainieri", "V.", "" ], [ "Szokoly", "G.", "" ] ]
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711.4823
David Schiminovich
David Schiminovich, Ted K. Wyder, D. Christopher Martin, Benjamin. D. Johnson, Samir Salim, Mark Seibert, Marie A. Treyer, Tamas Budavari, Charles Hoopes, Michel Zamojski, Tom A. Barlow, Karl G. Forster, Peter G. Friedman, Patrick Morrissey, Susan G. Neff, Todd A. Small, Luciana Bianchi, Jose Donas, Timothy M. Heckman, Young-Wook Lee, Barry F. Madore, Bruno Milliard, R. Michael Rich, Alex. S. Szalay, Barry Y. Welsh, Sukyoung K. Yi
The UV-Optical Color Magnitude Diagram II: Physical Properties and Morphological Evolution On and Off of a Star-Forming Sequence
30 pages, 28 figures, scheduled to appear as part of the GALEX Special Ap.J.Suppl., December, 2007 (29 papers)
null
10.1086/524659
null
astro-ph
null
We use the UV-optical color magnitude diagram in combination with spectroscopic and photometric measurements derived from the SDSS spectroscopic sample to measure the distribution of galaxies in the local universe (z<0.25) and their physical properties as a function of specific star formation rate (SSFR) and stellar mass. Throughout this study our emphasis is on the properties of galaxies on and off of a local "star-forming sequence." We discuss how the physical characteristics of galaxies along this sequence are related to scaling relations typically derived for galaxies of different morphological types. We find, among other trends that our measure of the star formation rate surface density is nearly constant along this sequence. We discuss this result and implications for galaxies at higher redshift. For the first time, we report on measurements of the local UV luminosity function versus galaxy structural parameters as well as inclination. We also split our sample into disk-dominated and bulge-dominated subsamples using the i-band Sersic index and find that disk-dominated galaxies occupy a very tight locus in SSFR vs. stellar mass space while bulge-dominated galaxies display a much larger spread of SSFR at fixed stellar mass. A significant fraction of galaxies with SSFR and SF surface density above those on the "star-forming sequence" are bulge-dominated. We can use our derived distribution functions to ask whether a significant fraction of these galaxies may be experiencing a final episode of star formation (possibly induced by a merger or other burst), soon to be quenched, by determining whether this population can explain the growth rate of the non-star-forming galaxies on the "red sequence." (Abridged)
[ { "version": "v1", "created": "Fri, 30 Nov 2007 17:14:21 GMT" } ]
2009-11-13T00:00:00
[ [ "Schiminovich", "David", "" ], [ "Wyder", "Ted K.", "" ], [ "Martin", "D. Christopher", "" ], [ "Johnson", "Benjamin. D.", "" ], [ "Salim", "Samir", "" ], [ "Seibert", "Mark", "" ], [ "Treyer", "Marie A.", "" ], [ "Budavari", "Tamas", "" ], [ "Hoopes", "Charles", "" ], [ "Zamojski", "Michel", "" ], [ "Barlow", "Tom A.", "" ], [ "Forster", "Karl G.", "" ], [ "Friedman", "Peter G.", "" ], [ "Morrissey", "Patrick", "" ], [ "Neff", "Susan G.", "" ], [ "Small", "Todd A.", "" ], [ "Bianchi", "Luciana", "" ], [ "Donas", "Jose", "" ], [ "Heckman", "Timothy M.", "" ], [ "Lee", "Young-Wook", "" ], [ "Madore", "Barry F.", "" ], [ "Milliard", "Bruno", "" ], [ "Rich", "R. Michael", "" ], [ "Szalay", "Alex. S.", "" ], [ "Welsh", "Barry Y.", "" ], [ "Yi", "Sukyoung K.", "" ] ]
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711.4824
Jiunn-Wei Chen
Jiunn-Wei Chen and Juven Wang
Bulk Viscosity of a Gas of Massless Pions
12 pages, 1 figure; the version to appear in PRC
Phys. Rev. C 79, 044913 (2009)
10.1103/PhysRevC.79.044913
null
hep-ph hep-ex hep-lat nucl-ex nucl-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In the hadronic phase, the dominant configuration of QCD with two flavors of massless quarks is a gas of massless pions. We calculate the bulk viscosity (zeta) using the Boltzmann equation with the kinetic theory generalized to incorporate the trace anomaly. We find that the dimensionless ratio zeta/s, s being the entropy density, is monotonic increasing below T=120 MeV, where chiral perturbation theory is applicable. This, combined with previous results, shows that zeta/s reaches its maximum near the phase transition temperature Tc, while eta/s, eta being the shear viscosity, reaches its minimum near Tc in QCD with massless quarks.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 20:41:35 GMT" }, { "version": "v2", "created": "Tue, 9 Dec 2008 10:29:35 GMT" }, { "version": "v3", "created": "Tue, 31 Mar 2009 10:32:12 GMT" } ]
2014-05-19T00:00:00
[ [ "Chen", "Jiunn-Wei", "" ], [ "Wang", "Juven", "" ] ]
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711.4825
Nitish Korula
Chandra Chekuri, Nitish Korula
Approximation Algorithms for Orienteering with Time Windows
10 pages, 2 figures
null
null
null
cs.DS
null
Orienteering is the following optimization problem: given an edge-weighted graph (directed or undirected), two nodes s,t and a time limit T, find an s-t walk of total length at most T that maximizes the number of distinct nodes visited by the walk. One obtains a generalization, namely orienteering with time-windows (also referred to as TSP with time-windows), if each node v has a specified time-window [R(v), D(v)] and a node v is counted as visited by the walk only if v is visited during its time-window. For the time-window problem, an O(\log \opt) approximation can be achieved even for directed graphs if the algorithm is allowed quasi-polynomial time. However, the best known polynomial time approximation ratios are O(\log^2 \opt) for undirected graphs and O(\log^4 \opt) in directed graphs. In this paper we make some progress towards closing this discrepancy, and in the process obtain improved approximation ratios in several natural settings. Let L(v) = D(v) - R(v) denote the length of the time-window for v and let \lmax = \max_v L(v) and \lmin = \min_v L(v). Our results are given below with \alpha denoting the known approximation ratio for orienteering (without time-windows). Currently \alpha = (2+\eps) for undirected graphs and \alpha = O(\log^2 \opt) in directed graphs. 1. An O(\alpha \log \lmax) approximation when R(v) and D(v) are integer valued for each v. 2. An O(\alpha \max{\log \opt, \log \frac{\lmax}{\lmin}}) approximation. 3. An O(\alpha \log \frac{\lmax}{\lmin}) approximation when no start and end points are specified. In particular, if \frac{\lmax}{\lmin} is poly-bounded, we obtain an O(\log n) approximation for the time-window problem in undirected graphs.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 21:10:48 GMT" } ]
2007-12-03T00:00:00
[ [ "Chekuri", "Chandra", "" ], [ "Korula", "Nitish", "" ] ]
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711.4826
Ian Leary
Ian J Leary
The integral cohomology rings of some p-groups
null
Math. Proc. Cambridge Phil. Soc. 110 (1991) 25--32
10.1017/S0305004100070080
null
math.AT
null
We determine the integral cohomology rings of an infinite family of p-groups, for odd primes p, with cyclic derived subgroups. Our method involves embedding the groups in a compact Lie group of dimension one, and was suggested by P H Kropholler and J Huebschmann.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 21:15:36 GMT" } ]
2015-05-13T00:00:00
[ [ "Leary", "Ian J", "" ] ]
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711.4827
Stanislav Soskin
S.M. Soskin, R. Mannella, O.M. Yevtushenko
Separatrix chaos: new approach to the theoretical treatment
10 pages, 4 figures, proceedings of the conference "Chaos, Complexity and Transport" (Marseille, 5-9 June 2007), in press
null
10.1142/9789812818805_0008
null
nlin.CD
null
We develop a new approach to the theoretical treatment of the separatrix chaos, using a special analysis of the separatrix map. The approach allows us to describe boundaries of the separatrix chaotic layer in the Poincar\'{e} section and transport within the layer. We show that the maximum which the width of the layer in energy takes as the perturbation frequency varies is much larger than the perturbation amplitude, in contrast to predictions by earlier theories suggesting that the maximum width is of the order of the amplitude. The approach has also allowed us to develop the self-consistent theory of the earlier discovered (PRL 90, 174101 (2003)) drastic facilitation of the onset of global chaos between adjacent separatrices. Simulations agree with the theory.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 21:19:15 GMT" } ]
2016-11-23T00:00:00
[ [ "Soskin", "S. M.", "" ], [ "Mannella", "R.", "" ], [ "Yevtushenko", "O. M.", "" ] ]
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711.4828
Ian Appelbaum
Hyuk-Jae Jang, Jing Xu, Jing Li, Biqin Huang, and Ian Appelbaum
Non-ohmic spin transport in n-type doped silicon
6 pages, 7 figures
Phys. Rev. B 78, 165329 (2008)
10.1103/PhysRevB.78.165329
null
cond-mat.mtrl-sci cond-mat.other
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We demonstrate the injection and transport of spin-polarized electrons through n-type doped silicon with in-plane spin-valve and perpendicular magnetic field spin precession and dephasing ("Hanle effect") measurements. A voltage applied across the transport layer is used to vary the confinement potential caused by conduction band-bending and control the dominant transport mechanism between drift and diffusion. By modeling transport in this device with a Monte-Carlo scheme, we simulate the observed spin polarization and Hanle features, showing that the average transit time across the short Si transport layer can be controlled over 4 orders of magnitude with applied voltage. As a result, this modeling allows inference of a long electron spin lifetime, despite the short transit length.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 17:20:54 GMT" }, { "version": "v2", "created": "Mon, 10 Mar 2008 21:50:39 GMT" }, { "version": "v3", "created": "Mon, 11 Aug 2008 14:58:32 GMT" } ]
2009-11-13T00:00:00
[ [ "Jang", "Hyuk-Jae", "" ], [ "Xu", "Jing", "" ], [ "Li", "Jing", "" ], [ "Huang", "Biqin", "" ], [ "Appelbaum", "Ian", "" ] ]
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711.4829
Robert \v{S}\'amal
Jiri Matousek, Robert Samal
Induced trees in triangle-free graphs
null
null
null
null
math.CO
null
We prove that every connected triangle-free graph on $n$ vertices contains an induced tree on $\exp(c\sqrt{\log n})$ vertices, where $c$ is a positive constant. The best known upper bound is $(2+o(1))\sqrt n$. This partially answers questions of Erdos, Saks, and Sos and of Pultr.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 01:11:42 GMT" } ]
2007-12-03T00:00:00
[ [ "Matousek", "Jiri", "" ], [ "Samal", "Robert", "" ] ]
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711.483
Paul Lasky
Paul Lasky, Anthony Lun
Gravitational collapse of plasmas in General Relativity
Talk given at the Spanish Relativity Meeting, Tenerife, September 2007
null
10.1051/eas:0830028
null
gr-qc
null
We provide a covariant derivation of plasma physics coupled to gravitation by utilizing the 3+1 formulation of general relativity, including a discussion of the Lorentz force law. We then reduce the system to the spherically symmetric case and show that all regions of the spacetime can be represented in a single coordinate system, thus revoking the need for junction conditions. We further show that the region exterior to the collapsing region is naturally described by the charged Vaidya spacetime in non-null coordinates.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 21:28:21 GMT" } ]
2009-11-13T00:00:00
[ [ "Lasky", "Paul", "" ], [ "Lun", "Anthony", "" ] ]
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711.4831
Ian Leary
Ian J. Leary
The mod-p cohomology rings of some p-groups
null
Math. Proc. Cambridge Phil. Soc. 112 (1992) 63--75
10.1017/S0305004100070766
null
math.AT
null
We determine the mod-p cohomology rings of an infinite family of p-groups, for odd primes p, with cyclic derived subgroups. Our method involves embedding the groups in a compact Lie group of dimension one, and was suggested by P. H. Kropholler and J. Huebschmann.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 21:28:21 GMT" } ]
2015-05-13T00:00:00
[ [ "Leary", "Ian J.", "" ] ]
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711.4832
Ian Leary
Ian J Leary and Nobuaki Yagita
Some examples in the integral and Brown-Peterson cohomology of p-groups
null
Bull. London Math. Soc. 24 (1992) 165--168
null
null
math.AT
null
For each odd prime p, we exhibit p-groups G of p-rank two such that (suitably defined) Chern classes of unitary representations of G fail to generate the following rings: 1. The even degree integral cohomology of G; 2. The final page of the Atiyah-Hirzebruch spectral sequence for G; 3. The Brown-Peterson generalized cohomology of G. It follows that these groups afford counterexamples to conjectures of C. B. Thomas, M. F. Atiyah and P. Landweber.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 21:34:07 GMT" } ]
2007-12-03T00:00:00
[ [ "Leary", "Ian J", "" ], [ "Yagita", "Nobuaki", "" ] ]
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711.4833
Sara L. Ellison
Sara L. Ellison, David R. Patton, Luc Simard, Alan W. McConnachie
Clues to the Origin of the Mass-Metallicity Relation: Dependence on Star Formation Rate and Galaxy Size
Accepted by ApJ Letters
null
10.1086/527296
null
astro-ph
null
We use a sample of 43,690 galaxies selected from the Sloan Digital Sky Survey Data Release 4 to study the systematic effects of specific star formation rate (SSFR) and galaxy size (as measured by the half light radius, r_h) on the mass-metallicity relation. We find that galaxies with high SSFR or large r_h for their stellar mass have systematically lower gas phase-metallicities (by up to 0.2 dex) than galaxies with low SSFR or small r_h. We discuss possible origins for these dependencies, including galactic winds/outflows, abundance gradients, environment and star formation rate efficiencies.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 21:34:53 GMT" } ]
2009-11-13T00:00:00
[ [ "Ellison", "Sara L.", "" ], [ "Patton", "David R.", "" ], [ "Simard", "Luc", "" ], [ "McConnachie", "Alan W.", "" ] ]
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711.4834
Ian Leary
Ian J. Leary
A differential in the Lyndon-Hochschild-Serre spectral sequence
null
J. Pure and Appl. Algebra 88 (1993), 155--168
null
null
math.AT
null
We consider the Lyndon-Hochschild-Serre spectral sequence with mod-p coefficients for a central extension with kernel cyclic of order a power of p and arbitrary discrete quotient group. For this spectral sequence the second and third differentials are known, and we give a description for the fourth differential. Using this result we deduce a similar formula for the Serre spectral sequence for a principal fibration with fibre the classifying space of a cyclic p-group. The differential from odd rows to even rows involves a Massey triple product, so we describe the calculation of such products in the cohomology of a finite abelian group. As an example we determine the Poincare series for the mod-3 cohomology of various 3-groups. Remarks. 1) My definition of the higher differentials $d_i$ for $i\geq 2$ in the spectral sequence for a double chain complex differs from the usual one by a factor of $(-1)^{i+1}$. Both conventions are consistent, but the usual definition has the advantage of agreeing with the ``obvious'' definition of the differentials in the spectral sequence for the associated filtered chain complex. All of the theorems in this paper remain true exactly as stated if the more usual definition of $d_i$ is taken. 2) Carles Broto found a small mistake in this paper: the result for fibrations with fibre the classifying space of a cyclic group is stated for arbitrary fibrations, although it is only proved for principal fibrations. Since it is apparent from the first sentence of the proof that only principal fibrations are being considered, I have not bothered to publish an erratum.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 21:40:02 GMT" } ]
2007-12-03T00:00:00
[ [ "Leary", "Ian J.", "" ] ]
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711.4835
Han Peters
Han Peters
Time averages of polynomials
15 pages
null
null
null
math.CV math.DS
null
We define and study when a polynomial mapping has a local or global time average. We conjecture that a polynomial f in the complex plane has a time average near a point z if and only if z is eventually mapped into a Siegel-disc of f. We prove that the conjecture holds generically, namely for those polynomials whose iterates have the maximal number of critical values. Important steps in the proofs rely on understanding the iterated monodromy groups. We also show that a polynomial automorphism of C^2 has a global time average if and only if the map is conjugate to an elementary mapping. The definition of a time average is motivated by an attempt to understand the polynomial automorphism groups in dimensions 3 and higher.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 21:49:17 GMT" } ]
2007-12-03T00:00:00
[ [ "Peters", "Han", "" ] ]
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711.4836
Markus Perling
Markus Perling
Divisorial Cohomology Vanishing on Toric Varieties
35 pages, 4 figures, requires packages ams*, enumerate, graphicx, xy, rewritten version
Documenta Math. 16, 209-251, 2011
null
null
math.AG math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This work discusses combinatorial and arithmetic aspects of cohomology vanishing for divisorial sheaves on toric varieties. We obtain a refined variant of the Kawamata-Viehweg theorem which is slightly stronger. Moreover, we prove a new vanishing theorem related to divisors whose inverse is nef and has small Kodaira dimension. Finally, we give a new criterion for divisorial sheaves for being maximal Cohen-Macaulay.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 21:54:11 GMT" }, { "version": "v2", "created": "Thu, 6 Aug 2009 17:08:55 GMT" } ]
2012-01-30T00:00:00
[ [ "Perling", "Markus", "" ] ]
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711.4837
Jianmin Tao
Jianmin Tao, Sergei Tretiak, Jian-Xin Zhu
Performance of a non-empirical meta-GGA density functional for excitation energies
7 pages
null
10.1063/1.2837831
null
cond-mat.mtrl-sci
null
It is known that the adiabatic approximation in time-dependent density functional theory usually provides a good description of low-lying excitations of molecules. In the present work, the capability of the adiabatic nonempirical meta-generalized gradient approximation (meta-GGA) of Tao, Perdew, Staroverov, and Scuseria (TPSS) to describe atomic and molecular excitations is tested. The adiabatic (one-parameter) hybrid version of the TPSS meta-GGA and the adiabatic GGA of Perdew, Burke, and Ernzerhof (PBE) are also included in the test. The results are compared to experiments and to two well-established hybrid functionals PBE0 and B3LYP. Calculations show that both adiabatic TPSS and TPSSh functionals produce excitation energies in fairly good agreement with experiments, and improve upon the adiabatic local spin density approximation and, in particular, the adiabatic PBE GGA. This further confirms that TPSS is indeed a reliable nonhybrid universal functional which can serve as the starting point from which higher-level approximations can be constructed. The systematic underestimate of the low-lying vertical excitation energies of molecules with time-dependent density functionals within the adiabatic approximation suggests that further improvement can be made with nonadiabatic corrections.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 21:48:55 GMT" } ]
2009-11-13T00:00:00
[ [ "Tao", "Jianmin", "" ], [ "Tretiak", "Sergei", "" ], [ "Zhu", "Jian-Xin", "" ] ]
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711.4838
Ian Leary
Ian J. Leary
p-Groups are not determined by their integral cohomology groups
null
Bull. London Math. Soc. 27 (1995) 585--589
null
null
math.AT
null
For each prime p, we exhibit pairs of p-groups all of whose integral cohomology groups are isomorphic. The method used involves very little calculation. The groups are exhibited as kernels of homomorphisms from a compact Lie group G to U(1), and the main result is that kernels of `similar' elements of Hom(G,U(1)) have isomorphic integral cohomology groups. The 2-groups constructed in this version have been corrected (there was a mistake in the presentations given in the published paper).
[ { "version": "v1", "created": "Thu, 29 Nov 2007 21:50:08 GMT" } ]
2007-12-03T00:00:00
[ [ "Leary", "Ian J.", "" ] ]
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711.4839
Ian Leary
Ian J. Leary
3-groups are not determined by their integral cohomology rings
null
J. Pure and Appl. Algebra 88 (1993), 61--79
null
null
math.AT
null
We compute the integral cohomology rings of a family of 3-groups. As a corollary, we exhibit, for each n greater than or equal to 5, a pair of groups of order 3^n whose integral cohomology rings are isomorphic.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 21:54:50 GMT" } ]
2007-12-03T00:00:00
[ [ "Leary", "Ian J.", "" ] ]
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711.484
Luca Pezz\'e
L. Pezze' and A. Smerzi
Entanglement, Non-linear Dynamics, and the Heisenberg Limit
Phys. Rev. Lett. 102, 100401 (2009)
null
10.1103/PhysRevLett.102.100401
null
quant-ph cond-mat.other
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We show that the quantum Fisher information provides a sufficient condition to recognize multi-particle entanglement in a $N$ qubit state. The same criterion gives a necessary and sufficient condition for sub shot-noise phase sensitivity in the estimation of a collective rotation angle $\theta$. The analysis therefore singles out the class of entangled states which are {\it useful} to overcome classical phase sensitivity in metrology and sensors. We finally study the creation of useful entangled states by the non-linear dynamical evolution of two decoupled Bose-Einstein condensates or trapped ions.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 22:13:33 GMT" }, { "version": "v2", "created": "Fri, 30 Nov 2007 21:35:10 GMT" }, { "version": "v3", "created": "Sun, 29 Mar 2009 21:06:10 GMT" } ]
2015-05-13T00:00:00
[ [ "Pezze'", "L.", "" ], [ "Smerzi", "A.", "" ] ]
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711.4841
David Callan
David Callan
Sets, Lists and Noncrossing Partitions
8 pages, published version includes revisions
Journal of Integer Sequences, Vol. 11, 2008, Article 08.1.3
null
null
math.CO
null
Partitions of [n]={1,2,...,n} into sets of lists are counted by sequence number A000262 in the On-Line Encyclopedia of Integer Sequences. They are somewhat less numerous than partitions of [n] into lists of sets, A000670. Here we observe that the former are actually equinumerous with partitions of [n] into lists of *noncrossing* sets and give a bijective proof. We show that partitions of [n] into sets of noncrossing lists are counted by A088368 and generalize this result to introduce a transform on integer sequences that we dub the "noncrossing partition" transform. We also derive recurrence relations to count partitions of [n] into lists of noncrossing lists.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 22:14:24 GMT" }, { "version": "v2", "created": "Thu, 7 Feb 2008 14:45:00 GMT" } ]
2008-02-07T00:00:00
[ [ "Callan", "David", "" ] ]
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711.4842
George Chechin M.
G.M. Chechin and G.S.Dzhelauhova
Construction of the discrete breathers and a simple physical interpretation of their existence
29 pages, 17 figures
null
null
null
nlin.PS
null
We present a simple numerical method for the discrete breather construction based on the idea of the pair synchronization of the particles involved in the breather vibration. It can be used for obtaining exact breather solutions in nonlinear Hamiltonian lattices of different types. We illustrate the above method using chains of the coupled Duffng oscillators. With some additional approximation, the pair synchronization method leads to a very simple physical interpretation of the existence of the exact breathers as strictly time-periodic and spatially localized dynamical objects.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 22:22:38 GMT" } ]
2007-12-03T00:00:00
[ [ "Chechin", "G. M.", "" ], [ "Dzhelauhova", "G. S.", "" ] ]
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711.4843
Eduardo D. Sontag
Eduardo D. Sontag
Network reconstruction based on quasi-steady state data
Related material can be found in http://www.math.rutgers.edu/~sontag/PUBDIR/index.html
null
null
null
q-bio.QM
null
This note discusses a theoretical issue regarding the application of the "Modular Response Analysis" method to quasi-steady state (rather than steady-state) data.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 22:39:57 GMT" } ]
2007-12-03T00:00:00
[ [ "Sontag", "Eduardo D.", "" ] ]
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711.4844
Brian Wilhite
B. C. Wilhite, R. J. Brunner, C. J. Grier, D. P. Schneider and D. E. Vanden Berk
On the variability of quasars: a link between Eddington ratio and optical variability?
13 pages, 5 figures, Accepted for publication in MNRAS
Mon.Not.Roy.Astron.Soc.383:1232-1240,2008
10.1111/j.1365-2966.2007.12655.x
null
astro-ph
null
Repeat scans by the Sloan Digital Sky Survey (SDSS) of a 278 square degree stripe along the Celestial equator have yielded an average of over 10 observations each for nearly 8,000 spectroscopically confirmed quasars. Over 2500 of these quasars are in the redshift range such that the CIV emission line is visible in the SDSS spectrum. Utilising the width of these CIV lines and the luminosity of the nearby continuum, we estimate black hole masses for these objects. In an effort to isolate the effects of black hole mass and luminosity on the photometric variability of our dataset, we create several subsamples by binning in these two physical parameters. By comparing the ensemble structure functions of the quasars in these bins, we are able to reproduce the well-known anticorrelation between luminosity and variability, now showing that this anticorrelation is independent of the black hole mass. In addition, we find a correlation between variability and the mass of the central black hole. By combining these two relations, we identify the Eddington ratio as a possible driver of quasar variability, most likely due to differences in accretion efficiency.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 22:30:44 GMT" } ]
2009-06-23T00:00:00
[ [ "Wilhite", "B. C.", "" ], [ "Brunner", "R. J.", "" ], [ "Grier", "C. J.", "" ], [ "Schneider", "D. P.", "" ], [ "Berk", "D. E. Vanden", "" ] ]
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711.4845
Haojing Yan
Haojing Yan (OCIW), Nimish Hathi (ASU) and Rogier Windhorst (ASU)
An Overdensity of i-dropouts Among A Population of Excess Field Objects in the Virgo Cluster
Accepted for publication in ApJ
Astrophys.J.675:136-145,2008
10.1086/527349
null
astro-ph
null
Using a set of deep imaging data obtained by the ACS on the HST shortly after its deployment, Yan, Windhorst & Cohen (2003) found a large number of F775W-band dropouts (i-dropouts), which are consistent with being galaxies at z~6. The surface density of i-dropouts thus derived, however, is an order of magnitude higher than those subsequent studies found in other deep ACS fields, including the HUDF. Here we revisit this problem, using both the existing and the new data. We confirm that the large overdensity of i-dropouts does exist in this field, and that their optical-to-IR colors are similar to those in the HUDF. However, we have discovered that the i-dropout overdensity is accompanied with an even larger excess of faint field objects in this region and its vicinity. This large excess of field objects is most likely caused by the tidal ``debris'' and/or halo stars related to an interacting galaxy pair in the Virgo Cluster, M60/NGC4647, which lies several arcminutes away from the region where the excess is found. This excess population is also red in color, and the red wing of its color distribution continuously extends to the regime where the i-dropouts reside. While we still cannot completely rule out the possibility that the overdensity of i-dropouts might be a genuine large-scale structure of galaxies at z~6, we prefer the interpretation that most of them are part of the excess stellar population related to M60/NGC4647. Future spectroscopic work will be needed to identify the nature of this i-dropout overdensity. (Abridged)
[ { "version": "v1", "created": "Thu, 29 Nov 2007 22:40:27 GMT" } ]
2010-11-11T00:00:00
[ [ "Yan", "Haojing", "", "OCIW" ], [ "Hathi", "Nimish", "", "ASU" ], [ "Windhorst", "Rogier", "", "ASU" ] ]
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711.4846
Chris Ticknor
Christopher Ticknor
Collisional Control of Ground State Polar Molecules and Universal Dipolar Scattering
4 pages, 2 figures
Physical Review Letters 100, 133202 (2008)
10.1103/PhysRevLett.100.133202
null
physics.atom-ph
null
We explore the impact of the short range interaction on the scattering of ground state polar molecules, and study the transition from a weak to strong dipolar scattering over an experimentally reasonable range of energies and electric field values. In the strong dipolar limit, the scattering scales with respect to a dimensionless quantity defined by mass, induced dipole moment, and collision energy. The scaling has implications for all quantum mechanical dipolar scattering, and therefore this universal dipolar scaling provides estimates of scattering cross sections for any dipolar system.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 22:44:41 GMT" } ]
2009-11-13T00:00:00
[ [ "Ticknor", "Christopher", "" ] ]
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711.4847
Yogesh N. Joglekar
C.-H. Zhang and Yogesh N. Joglekar
Supersolid of indirect excitons in electron-hole quantum Hall systems
5 pages, 4 figures
null
null
null
cond-mat.mes-hall cond-mat.other
null
We investigate the ground state of a balanced electron-hole system in the quantum Hall regime using mean-field theory and obtain a rich phase diagram as a function of interlayer distance d and the filling factor within a layer. We identify an excitonic condensate phase, an excitonic supersolid phase, as well as uncorrelated Wigner crystal states. We find that balanced electron-hole system exhibits a supersolid phase a wide range of filling factors, with different crystal structure ground states. We obtain the ground state stiffness in the excitonic phases and show that the phase transitions from a uniform condensate to a supersolid is accompanied by a marked change in the stiffness. Our results provide the first semi-quantitative determination excitonic supersolid phase diagram and properties.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 22:50:25 GMT" } ]
2007-12-03T00:00:00
[ [ "Zhang", "C. -H.", "" ], [ "Joglekar", "Yogesh N.", "" ] ]
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711.4848
Robert V. Wagoner
Alexander S. Silbergleit and Robert V. Wagoner
Corotation Resonance and Diskoseismology Modes of Black Hole Accretion Disks
16 pages, no figures. Submitted to The Astrophysical Journal
Astrophysical Journal 680, 1319 (2008)
10.1086/588013
null
astro-ph gr-qc
null
We demonstrate that the corotation resonance affects only some non-axisymmetric g-mode oscillations of thin accretion disks, since it is located within their capture zones. Using a more general (weaker radial WKB approximation) formulation of the governing equations, such g-modes, treated as perfect fluid perturbations, are shown to formally diverge at the position of the corotation resonance. A small amount of viscosity adds a small imaginary part to the eigenfrequency which has been shown to induce a secular instability (mode growth) if it acts hydrodynamically. The g-mode corotation resonance divergence disappears, but the mode magnitude can remain largest at the place of the corotation resonance. For the known g-modes with moderate values of the radial mode number and axial mode number (and any vertical mode number), the corotation resonance lies well outside their trapping region (and inside the innermost stable circular orbit), so the observationally relevant modes are unaffected by the resonance. The axisymmetric g-mode has been seen by Reynolds & Miller in a recent inviscid hydrodynamic accretion disk global numerical simulation. We also point out that the g-mode eigenfrequencies are approximately proportional to m for axial mode numbers |m|>0.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 22:52:40 GMT" } ]
2009-11-13T00:00:00
[ [ "Silbergleit", "Alexander S.", "" ], [ "Wagoner", "Robert V.", "" ] ]
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711.4849
Hasan G\"umral
E. Abadoglu and H. Gumral
Bi-Hamiltonian Structure in Serret-Frenet Frame
null
null
null
null
math-ph math.MP
null
We reduced the problem of constructing bi-Hamiltonian structure in three dimensions to the solution of a Riccati equation in moving coordinates of Serret-Frenet frame. We then show that either the linearly independent solutions of the corresponding second order equation or the normal vectors of the moving frame imply two compatible Poisson structures.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 23:08:54 GMT" } ]
2007-12-03T00:00:00
[ [ "Abadoglu", "E.", "" ], [ "Gumral", "H.", "" ] ]
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711.485
Maru\v{s}a Brada\v{c}
Maru\v{s}a Brada\v{c} (1 and 2), Tim Schrabback (3), Thomas Erben (3), Michael McCourt (1), Evan Million (1), Adam Mantz (1), Steve Allen (1), Roger Blandford (1), Aleksi Halkola (3), Hendrik Hildebrandt (3), Marco Lombardi (4 and 5), Phil Marshall (2), Peter Schneider (3), Tommaso Treu (2), Jean-Paul Kneib (6) ((1) KIPAC, Stanford, (2) UC Santa Barbara, (3) AIfA, Bonn, (4) ESO, (5) Universita degli Studi, Milano, (6) OAMP, Marseille)
Dark Matter and Baryons in the Most X-ray Luminous and Merging Galaxy Cluster RX J1347.5-1145
12 pages, Accepted for publication in ApJ, full-res version http://www.physics.ucsb.edu/~marusa/RXJ1347.pdf
null
10.1086/588377
null
astro-ph
null
The galaxy cluster RX J1347-1145 is one of the most X-ray luminous and most massive clusters known. Its extreme mass makes it a prime target for studying issues addressing cluster formation and cosmology. In this paper we present new high-resolution HST/ACS and Chandra X-ray data. The high resolution and sensitivity of ACS enabled us to detect and quantify several new multiply imaged sources, we now use a total of eight for the strong lensing analysis. Combining this information with shape measurements of weak lensing sources in the central regions of the cluster, we derive a high-resolution, absolutely-calibrated mass map. This map provides the best available quantification of the total mass of the central part of the cluster to date. We compare the reconstructed mass with that inferred from the new Chandra X-ray data, and conclude that both mass estimates agree extremely well in the observed region, namely within 400 / h_70 kpc of the cluster center. In addition we study the major baryonic components (gas and stars) and hence derive the dark matter distribution in the center of the cluster. We find that the dark matter and baryons are both centered on the BCG within the uncertainties (alignment is better than <10 kpc). We measure the corresponding 1-D profiles and find that dark matter distribution is consistent with both NFW and cored profiles, indicating that a more extended radial analysis is needed to pinpoint the concentration parameter, and hence the inner slope of the dark matter profile.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 23:31:12 GMT" }, { "version": "v2", "created": "Tue, 4 Dec 2007 18:57:22 GMT" }, { "version": "v3", "created": "Thu, 27 Mar 2008 00:39:06 GMT" } ]
2009-11-13T00:00:00
[ [ "Bradač", "Maruša", "", "1 and 2" ], [ "Schrabback", "Tim", "", "4\n and 5" ], [ "Erben", "Thomas", "", "4\n and 5" ], [ "McCourt", "Michael", "", "4\n and 5" ], [ "Million", "Evan", "", "4\n and 5" ], [ "Mantz", "Adam", "", "4\n and 5" ], [ "Allen", "Steve", "", "4\n and 5" ], [ "Blandford", "Roger", "", "4\n and 5" ], [ "Halkola", "Aleksi", "", "4\n and 5" ], [ "Hildebrandt", "Hendrik", "", "4\n and 5" ], [ "Lombardi", "Marco", "", "4\n and 5" ], [ "Marshall", "Phil", "" ], [ "Schneider", "Peter", "" ], [ "Treu", "Tommaso", "" ], [ "Kneib", "Jean-Paul", "" ] ]
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711.4851
Ralf Lehnert
Ralf Lehnert
A mapping between Lorentz-violating and conventional electrodynamics
6 pages; Presentation shortened and streamlined; Matches published version
Rev.Mex.Fis.56(6):469,2010
null
null
hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The Chern-Simons-type term in the photon sector of the Lorentz- and CPT-breaking minimal Standard-Model Extension (mSME) is considered. It is argued that under certain circumstances this term can be removed from the mSME. In particular, it is demonstrated that for lightlike Lorentz violation a field redefinition exists that maps the on-shell free Chern-Simons model to conventional on-shell free electrodynamics. A compact explicit expression for an operator implementing such a mapping is constructed. This expression establishes that the field redefinition is non-local.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 23:48:49 GMT" }, { "version": "v2", "created": "Thu, 17 Feb 2011 16:16:51 GMT" } ]
2011-02-18T00:00:00
[ [ "Lehnert", "Ralf", "" ] ]
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711.4852
Dirk Pleiter
G. Beckett, P. Coddington, N. Ishii, B. Joo, D. Melkumyan, R. Ostrowski, D. Pleiter, M. Sato, J. Simone, C. Watson, S. Zhang
Towards an interoperable International Lattice Datagrid
7 pages, poster presented at Lattice2007, Regensburg, Germany (Algorithms and machines)
PoS LAT2007:044,2007
null
null
hep-lat
null
The International Lattice Datagrid (ILDG) is a federation of several regional grids. Since most of these grids have reached production level, an increasing number of lattice scientists start to benefit from this new research infrastructure. The ILDG Middleware Working Group has the task of specifying the ILDG middleware such that interoperability among the different grids is achieved. In this paper we will present the architecture of the ILDG middleware and describe what has actually been achieved in recent years. Particular focus is given to interoperability and security issues. We will conclude with a short overview on issues which we plan to address in the near future.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 00:07:01 GMT" } ]
2014-11-18T00:00:00
[ [ "Beckett", "G.", "" ], [ "Coddington", "P.", "" ], [ "Ishii", "N.", "" ], [ "Joo", "B.", "" ], [ "Melkumyan", "D.", "" ], [ "Ostrowski", "R.", "" ], [ "Pleiter", "D.", "" ], [ "Sato", "M.", "" ], [ "Simone", "J.", "" ], [ "Watson", "C.", "" ], [ "Zhang", "S.", "" ] ]
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711.4853
Peter Tingley
Peter Tingley
A formula for the R-matrix using a system of weight preserving endomorphisms
11 pages. v2: expanded introduction and background. v3 edits for clarity. To appear in Representation theory, an electronic journal of the AMS.
Represent. Theory 14 (2010), 435-445
null
null
math.RT math.QA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We give a formula for the universal R-matrix of the quantized universal enveloping algebra $U_q(\g).$ This is similar to a previous formula due to Kirillov-Reshetikhin and Levendorskii-Soibelman, except that where they use the action of the braid group element $T_{w_0}$ on each representation, we show that one can instead use a system of weight preserving endomorphisms. One advantage of our construction is that it is well defined for all symmetrizable Kac-Moody algebras. However we have only established that the result in equal to the universal R-matrix in finite type.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 16:46:43 GMT" }, { "version": "v2", "created": "Mon, 25 Feb 2008 21:43:36 GMT" }, { "version": "v3", "created": "Thu, 22 Apr 2010 14:21:40 GMT" } ]
2010-08-23T00:00:00
[ [ "Tingley", "Peter", "" ] ]
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711.4854
Dao-Jun Liu
Dao-Jun Liu, Wei-Zhong Liu
Statefinder diagnostic for cosmology with the abnormally weighting energy hypothesis
5 pages, 4 figures, accepted by PRD
Phys.Rev.D77:027301,2008
10.1103/PhysRevD.77.027301
null
astro-ph
null
In this paper, we apply the statefinder diagnostic to the cosmology with the Abnormally Weighting Energy hypothesis (AWE cosmology), in which dark energy in the observational (ordinary matter) frame results from the violation of weak equivalence principle (WEP) by pressureless matter. It is found that there exist closed loops in the statefinder plane, which is an interesting characteristic of the evolution trajectories of statefinder parameters and can be used to distinguish AWE cosmology from the other cosmological models.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 00:39:45 GMT" } ]
2008-12-18T00:00:00
[ [ "Liu", "Dao-Jun", "" ], [ "Liu", "Wei-Zhong", "" ] ]
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711.4855
Jun Ma
Z. Fan (1,2), J. Ma (1), R. de Grijs (3), Y. Yang (1), X. Zhou (1) ((1)National Astronomical Observatories, Chinese Academy of Sciences; (2)Graduate University of Chinese Academy of Sciences; (3)Department of Physics & Astronomy, The University of Sheffield, Sheffield)
Reddening, Colour and Metallicity of the M31 Globular Cluster System
Accepted for Publication in MNRAS, 18 pages, 13 figures
null
10.1111/j.1365-2966.2007.12790.x
null
astro-ph
null
Using metallicities from the literature, combined with the Revised Bologna Catalogue of photometric data for M31 clusters and cluster candidates (the latter of which is the most comprehensive catalogue of M31 clusters currently available, including 337 confirmed globular clusters -- GCs -- and 688 GC candidates), we determine 443 reddening values and intrinsic colours, and 209 metallicities for individual clusters without spectroscopic observations. This, the largest sample of M31 GCs presently available, is then used to analyse the metallicity distribution of M31 GCs, which is bimodal with peaks at $\rm {[Fe/H]}\approx -1.7$ and -0.7 dex. An exploration of metallicities as a function of radius from the M31 centre shows a metallicity gradient for the metal-poor GCs, but no such gradient for the metal-rich GCs. Our results show that the metal-rich clusters appear as a centrally concentrated spatial distribution; however, the metal-poor clusters tend to be less spatially concentrated. There is no correlation between luminosity and metallicity among the M31 sample clusters, which indicates that self-enrichment is indeed unimportant for cluster formation in M31. The reddening distribution shows that slightly more than half of the GCs are affected by a reddening of $E(B-V) \la 0.2$ mag; the mean reddening value is $E(B-V) = 0.28_{-0.14}^{+0.23}$ mag. The spatial distribution of the reddening values indicates that the reddening on the northwestern side of the M31 disc is more significant than that on the southeastern side, which is consistent with the conclusion that the northwestern side in nearer to us.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 01:08:51 GMT" } ]
2009-11-13T00:00:00
[ [ "Fan", "Z.", "" ], [ "Ma", "J.", "" ], [ "de Grijs", "R.", "" ], [ "Yang", "Y.", "" ], [ "Zhou", "X.", "" ] ]
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711.4856
David Spiegel
David S. Spiegel, Kristen Menou, Caleb A. Scharf (Columbia University)
Habitable Climates
Accepted by ApJ. Several references added. 41 pages, 11 figures, 2 tables
null
10.1086/588089
null
astro-ph
null
According to the standard liquid-water definition, the Earth is only partially habitable. We reconsider planetary habitability in the framework of energy-balance models, the simplest seasonal models in physical climatology, to assess the spatial and temporal habitability of Earth-like planets. We quantify the degree of climatic habitability of our models with several metrics of fractional habitability. Previous evaluations of habitable zones may have omitted important climatic conditions by focusing on close Solar System analogies. For example, we find that model pseudo-Earths with different rotation rates or different land-ocean fractions have fractional habitabilities that differ significantly from that of the Earth itself. Furthermore, the stability of a planet's climate against albedo-feedback snowball events strongly impacts its habitability. Therefore, issues of climate dynamics may be central in assessing the habitability of discovered terrestrial exoplanets, especially if astronomical forcing conditions are different from the moderate Solar System cases.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 03:19:07 GMT" }, { "version": "v2", "created": "Mon, 3 Dec 2007 06:48:28 GMT" }, { "version": "v3", "created": "Wed, 27 Feb 2008 21:19:13 GMT" } ]
2009-11-13T00:00:00
[ [ "Spiegel", "David S.", "", "Columbia University" ], [ "Menou", "Kristen", "", "Columbia University" ], [ "Scharf", "Caleb A.", "", "Columbia University" ] ]
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711.4857
Shinsuke Iwao
Shinsuke Iwao
Solution of the genaralized periodic discrete Toda equation
18pages, 1figure
J.Phys.A. Math. Theor 41 (2008) 115201
10.1088/1751-8113/41/11/115201
null
math-ph math.MP
null
A box-ball system with more than one kind of balls is obtained by the generalized periodic discrete Toda equation (pd Toda eq.). We study the pd Toda equation in view of algebraic geometry. The time evolution of pd Toda eq. is linearized on an algebraic variety, and theta function solutions are obtained.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 01:49:51 GMT" }, { "version": "v2", "created": "Wed, 6 Feb 2008 12:36:19 GMT" } ]
2009-11-13T00:00:00
[ [ "Iwao", "Shinsuke", "" ] ]
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711.4858
Gloria Koenigsberger
C. Foellmi, G. Koenigsberger, L. Georgiev, O. Toledano, S.V. Marchenko, P. Massey, T.H. Dall, A.F.J. Moffat, N. Morrell, M. Corcoran, A. Kaufer, Y. Naze, J. Pittard, N. St.-Louis, A. Fullerton, D. Massa, A.M.T. Pollock
New insights into the nature of the SMC WR/LBV binary HD 5980
48 pages, 26 figures
Rev.Mex.Astron.Astrofis.44:3-27,2008
null
null
astro-ph
null
We present the results of optical wavelength observations of the unusual SMC eclipsing binary system HD 5980 obtained in 1999 and 2004--2005. Radial velocity curves for the erupting LBV/WR object (star A) and its close WR-like companion (star B) are obtained by deblending the variable emission-line profiles of N IV and N V lines under the simplistic assumption that these lines originate primarily in the winds of star A and star B. The derived masses M_A=58--79 Mo and M_B=51--67 Mo, are more consistent with the stars' location near the top of the HRD than previous estimates. The presence of a wind-wind interaction region is inferred from the orbital phase-dependent behavior of He I P Cygni absorption components. The emission-line intensities continued with the declining trend previously seen in UV spectra. The behavior of the photospheric absorption lines is consistent with the results of Schweickhardt (2002) who concludes that the third object in the combined spectrum, star C, is also a binary system with P(starC)~96.5 days, e=0.83. The data used in this paper will be made publicly available for further analysis.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 02:32:32 GMT" } ]
2014-11-18T00:00:00
[ [ "Foellmi", "C.", "" ], [ "Koenigsberger", "G.", "" ], [ "Georgiev", "L.", "" ], [ "Toledano", "O.", "" ], [ "Marchenko", "S. V.", "" ], [ "Massey", "P.", "" ], [ "Dall", "T. H.", "" ], [ "Moffat", "A. F. J.", "" ], [ "Morrell", "N.", "" ], [ "Corcoran", "M.", "" ], [ "Kaufer", "A.", "" ], [ "Naze", "Y.", "" ], [ "Pittard", "J.", "" ], [ "-Louis", "N. St.", "" ], [ "Fullerton", "A.", "" ], [ "Massa", "D.", "" ], [ "Pollock", "A. M. T.", "" ] ]
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711.4859
Veronique Godin
Veronique Godin
Higher string topology operations
78 pages, 12 figures. Typos corrected, some proofs clarified
null
null
null
math.AT math.GT
null
Chas and Sullivan have defined an intersection-type product on the homology of the free loop space LM of an oriented manifold M. In this paper we show how to extend this construction to a topological conformal field theory of degree d. In particular, we get operations on the homology of LM which are parameterized by the homology of the moduli space of open-closed Riemann surfaces.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 02:43:15 GMT" }, { "version": "v2", "created": "Tue, 19 Feb 2008 16:04:03 GMT" } ]
2008-02-19T00:00:00
[ [ "Godin", "Veronique", "" ] ]
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711.486
Bingsong Zou
B.S.Zou
On the nature of the lowest $1/2^-$ baryon nonet and decuplet
for Proceedings of NSTAR07 at Bonn, Germany
Eur.Phys.J.A35:325-328,2008
10.1140/epja/i2007-10561-8
null
nucl-th
null
From recent study of properties of the lowest spin-parity $1/2^-$ baryons, $N^*(1535)$ and $\Delta^*(1620)$, new pictures for the internal structure of the lowest $1/2^-$ baryon octet and decuplet are proposed. While the lowest $1/2^-$ baryon octet may have large diquark-diquark-antiquark component, the lowest $1/2^-$ baryon decuplet is proposed to have large vector-meson-baryon components. Evidence for the "missing" members of the new pictures is pointed out and suggestions are made for detecting these predicted states from forthcoming experiments.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 02:59:19 GMT" } ]
2008-11-26T00:00:00
[ [ "Zou", "B. S.", "" ] ]
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711.4861
Marshall Baker
M. Baker
Understanding Confinement From Deconfinement
18 pages, 5 figures, v2: fixed archive title (only)
Phys.Rev.D78:014009,2008
10.1103/PhysRevD.78.014009
null
hep-ph hep-lat
null
We use effective magnetic SU(N) pure gauge theory with cutoff M and fixed gauge coupling g_m to calculate non-perturbative magnetic properties of the deconfined phase of SU(N) Yang-Mills theory. We obtain the response to an external closed loop of electric current by reinterpreting and regulating the calculation of the one loop effective potential in Yang-Mills theory. This effective potential gives rise to a color magnetic charge density, the counterpart in the deconfined phase of color magnetic currents introduced in effective dual superconductor theories of the confined phase via magnetically charged Higgs fields. The resulting spatial Wilson loop has area law behavior. Using values of M and g_m determined in the confined phase, we find SU(3) spatial string tensions compatible with lattice simulations in the temperature interval 1.5T_c < T < 2.5T_c. Use of the effective theory to analyze experiments on heavy ion collisions will provide applications and further tests of these ideas.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 03:06:33 GMT" }, { "version": "v2", "created": "Mon, 3 Dec 2007 23:45:05 GMT" } ]
2008-11-26T00:00:00
[ [ "Baker", "M.", "" ] ]
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711.4862
Muzy
J.F. Muzy, E. Bacry, R. Baile and P. Poggi
Uncovering latent singularities from multifractal scaling laws in mixed asymptotic regime. Application to turbulence
4 pages, 3 figures
null
10.1209/0295-5075/82/60007
null
physics.data-an
null
In this paper we revisit an idea originally proposed by Mandelbrot about the possibility to observe ``negative dimensions'' in random multifractals. For that purpose, we define a new way to study scaling where the observation scale $\tau$ and the total sample length $L$ are respectively going to zero and to infinity. This ``mixed'' asymptotic regime is parametrized by an exponent $\chi$ that corresponds to Mandelbrot ``supersampling exponent''. In order to study the scaling exponents in the mixed regime, we use a formalism introduced in the context of the physics of disordered systems relying upon traveling wave solutions of some non-linear iteration equation. Within our approach, we show that for random multiplicative cascade models, the parameter $\chi$ can be interpreted as a negative dimension and, as anticipated by Mandelbrot, allows one to uncover the ``hidden'' negative part of the singularity spectrum, corresponding to ``latent'' singularities. We illustrate our purpose on synthetic cascade models. When applied to turbulence data, this formalism allows us to distinguish two popular phenomenological models of dissipation intermittency: We show that the mixed scaling exponents agree with a log-normal model and not with log-Poisson statistics.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 14:36:59 GMT" } ]
2009-11-13T00:00:00
[ [ "Muzy", "J. F.", "" ], [ "Bacry", "E.", "" ], [ "Baile", "R.", "" ], [ "Poggi", "P.", "" ] ]
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711.4863
S. Weinzierl
Christian Bogner and Stefan Weinzierl
Periods and Feynman integrals
22 pages, appendix added, version to be published
J.Math.Phys.50:042302,2009
10.1063/1.3106041
null
hep-th hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider multi-loop integrals in dimensional regularisation and the corresponding Laurent series. We study the integral in the Euclidean region and where all ratios of invariants and masses have rational values. We prove that in this case all coefficients of the Laurent series are periods.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 13:26:30 GMT" }, { "version": "v2", "created": "Wed, 4 Mar 2009 07:45:18 GMT" } ]
2009-11-19T00:00:00
[ [ "Bogner", "Christian", "" ], [ "Weinzierl", "Stefan", "" ] ]
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711.4864
Abdellatif Zaidi
Abdellatif Zaidi, Shivaprasad Kotagiri, J. Nicholas Laneman and Luc Vandendorpe
Cooperative Relaying with State Available at the Relay
Corrected typos and added references w.r.t. the first version. Paper also published in proc. of IEEE Information Theory Workshop 2008 (6 pages, 3 figures)
null
10.1109/ITW.2008.4578638
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider a state-dependent full-duplex relay channel with the state of the channel non-causally available at only the relay. In the framework of cooperative wireless networks, some specific terminals can be equipped with cognition capabilities, i.e, the relay in our model. In the discrete memoryless (DM) case, we derive lower and upper bounds on channel capacity. The lower bound is obtained by a coding scheme at the relay that consists in a combination of codeword splitting, Gel'fand-Pinsker binning, and a decode-and-forward scheme. The upper bound is better than that obtained by assuming that the channel state is available at the source and the destination as well. For the Gaussian case, we also derive lower and upper bounds on channel capacity. The lower bound is obtained by a coding scheme which is based on a combination of codeword splitting and Generalized dirty paper coding. The upper bound is also better than that obtained by assuming that the channel state is available at the source, the relay, and the destination. The two bounds meet, and so give the capacity, in some special cases for the degraded Gaussian case.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 03:36:06 GMT" }, { "version": "v2", "created": "Mon, 8 Sep 2008 11:31:07 GMT" } ]
2016-11-17T00:00:00
[ [ "Zaidi", "Abdellatif", "" ], [ "Kotagiri", "Shivaprasad", "" ], [ "Laneman", "J. Nicholas", "" ], [ "Vandendorpe", "Luc", "" ] ]
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711.4865
Oleg P. Sushkov
Alexander I. Milstein and Oleg P. Sushkov
Effective action, magnetic excitations and quantum fluctuations in lightly doped single layer cuprates
12 pages, 7 Figs
Phys. Rev. B 78, 014501 (2008)
10.1103/PhysRevB.78.014501
null
cond-mat.str-el cond-mat.supr-con
null
We consider the extended 2D $t-t'-t''-J$ model at zero temperature. Parameters of the model corresponds to doping by holes. Using the low doping effective action we demonstrate that the system can 1) preserve the long range collinear antiferromagnetic order, 2) lead to a spin spiral state (static or dynamic), 3) lead to the phase separation instability. We show that at parameters of the effective action corresponding to the single layer cuprate La$_{2-x}$Sr$_x$CuO$_4$ the spin spiral ground state is realized. We derive properties of magnetic excitations and calculate quantum fluctuations. Quantum fluctuations destroy the static spin spiral at the critical doping $x_c\approx 0.11$. This is the point of the quantum phase transition to the spin-liquid state (dynamic spin spiral). The state is still double degenerate with respect to the direction of the dynamic spiral, so this is a ``directional nematic''. The superconducting pairing exists throughout the phase diagram and is not sensitive to the quantum phase transition. We also compare the calculated neutron scattering spectra with experimental data.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 03:55:26 GMT" } ]
2009-11-13T00:00:00
[ [ "Milstein", "Alexander I.", "" ], [ "Sushkov", "Oleg P.", "" ] ]
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711.4866
Adam Ritz
Maxim Pospelov, Adam Ritz, Mikhail B. Voloshin
Secluded WIMP Dark Matter
17 pages, 3 figures
Phys.Lett.B662:53-61,2008
10.1016/j.physletb.2008.02.052
null
hep-ph
null
We consider a generic mechanism via which thermal relic WIMP dark matter may be decoupled from the Standard Model, namely through a combination of WIMP annihilation to metastable mediators with subsequent delayed decay to Standard Model states. We illustrate this with explicit examples of WIMPs connected to the Standard Model by metastable bosons or fermions. In all models, provided the WIMP mass is greater than that of the mediator, it can be secluded from the Standard Model with an extremely small elastic scattering cross-section on nuclei and rate for direct collider production. In contrast, indirect signatures from WIMP annihilation are consistent with a weak scale cross-section and provide potentially observable \gamma-ray signals. We also point out that \gamma-ray constraints and flavor physics impose severe restrictions on MeV-scale variants of secluded models, and identify limited classes that pass all the observational constraints.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 04:11:22 GMT" } ]
2008-11-26T00:00:00
[ [ "Pospelov", "Maxim", "" ], [ "Ritz", "Adam", "" ], [ "Voloshin", "Mikhail B.", "" ] ]
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711.4867
Akaki Tikaradze
Akaki Tikaradze
Infinitesimal Hecke algebra of sl_2 in positive characteristic
Accepted in Journal of Algebra, result about the Azumaya locus is added
null
null
null
math.QA math.RT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper we consider an infinitesimal Hecke algebra of $sl_2$ in positive characteristic. We show that it is a finitely generated module over its center, and the smooth and the Azumaya loci of its center coincide.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 04:04:02 GMT" }, { "version": "v2", "created": "Fri, 3 Oct 2008 02:58:20 GMT" }, { "version": "v3", "created": "Wed, 29 Oct 2008 02:19:20 GMT" } ]
2008-10-29T00:00:00
[ [ "Tikaradze", "Akaki", "" ] ]
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711.4868
LuXin Liu
Lu-Xin Liu
String Dynamics, Spontaneous Breaking of Supersymmetry and Dual Scalar Field Theory
15 pages
Phys.Rev.D79:045017,2009
10.1103/PhysRevD.79.045017
null
hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The dynamics of a vortex string, which describes the Nambu-Goldtone modes of the spontaneous breakdown of the target space D=4, N=1 supersymmetry and internal $U(1)_R$ symmetry to the world sheet ISO(1,1) symmetry, is constructed by using the approach of nonlinear realization. The resulting action describing the low energy oscillations of the string into the covolume (super)space is found to have an invariant synthesis form of the Akulov-Volkov and Nambu-Goto actions. Its dual scalar field action is obtained by means of introducing two vectorial Lagrangian multipliers into the action of the string
[ { "version": "v1", "created": "Fri, 30 Nov 2007 04:07:48 GMT" }, { "version": "v2", "created": "Tue, 11 Mar 2008 02:18:22 GMT" }, { "version": "v3", "created": "Fri, 27 Jun 2008 20:42:40 GMT" }, { "version": "v4", "created": "Fri, 19 Dec 2008 20:04:06 GMT" } ]
2009-03-12T00:00:00
[ [ "Liu", "Lu-Xin", "" ] ]
[ 0.0276875831, 0.0281900316, 0.0169245973, -0.0099498117, -0.0782762617, 0.0224250909, 0.0117348284, 0.0333203003, -0.0345103107, -0.0022444925, -0.0476268753, -0.0003043204, -0.1583507657, 0.0254530068, 0.0614045523, 0.0993791148, -0.0403545871, 0.0433428362, 0.0490019955, 0.0298824925, -0.0633614585, -0.0694966242, 0.0401430279, 0.1066778526, 0.1461862028, -0.0932968408, 0.0533124804, 0.062462341, 0.0703957453, -0.0093415845, 0.0579138547, -0.0488962196, -0.0252811164, -0.1090578735, -0.0615632199, 0.1473497748, 0.0138570135, -0.0074045113, -0.0379481204, -0.0069218958, -0.0208251886, -0.015999034, -0.0888541341, 0.1280980408, 0.0493722223, 0.0665348247, -0.0318393968, 0.0890656933, 0.0237737708, -0.0674868301, 0.0064128358, -0.0587600842, 0.0807091743, 0.0246332213, -0.1056200638, -0.0418090448, -0.0043005664, 0.0203491841, 0.0041154539, -0.0916043818, -0.0397728048, -0.1162508279, -0.0527042523, 0.0558511689, -0.0711890832, 0.0362821035, -0.0781704858, 0.0438717306, 0.0161444787, 0.1301078349, -0.0549520515, 0.0272380225, 0.0536827073, 0.0221474227, 0.0466748662, -0.0601352081, 0.0701313019, 0.043131277, 0.004832766, 0.0369167775, 0.0036857277, 0.0059070811, -0.0075962353, 0.0107431524, -0.0571734048, -0.0172815993, -0.0313105062, 0.0584427491, -0.0058608027, 0.0097713107, -0.0621450059, -0.0200847369, -0.0385827906, -0.0309931692, 0.099590674, -0.0420470461, 0.0355416536, 0.0224250909, -0.0375250056, -0.0436072834, -0.1405799389, 0.0305964984, 0.1017591432, -0.0422321595, 0.0538942628, 0.0119133294, -0.0506151244, -0.0695495158, -0.1237611175, -0.0206665192, -0.0178633835, 0.0682801679, -0.0651597008, 0.0114108808, 0.0261934586, -0.0881136805, -0.0666934922, -0.0162105914, -0.0675926059, -0.0007945801, -0.0077813477, 0.0280578081, 0.0561685078, -0.0463046394, 0.0055599944, -0.0300940499, -0.0784349293, -0.0398785807, -0.0660588145, 0.0522811376, 0.0862625539, -0.0080061276, -0.0353829861, -0.1416377276, -0.0717708692, 0.0200979598, 0.0417561531, 0.0555867217, 0.1079471931, 0.0982155502, 0.0316278413, -0.0062673897, 0.0517258011, 0.047097981, 0.1164623797, 0.1096925437, -0.0092688613, 0.0667463765, 0.0722468719, 0.0341665298, -0.0458286367, -0.0231258757, 0.0736748874, 0.0808678418, 0.0055203275, -0.1349736601, 0.0259686783, 0.0261273459, 0.0281900316, -0.0013420676, 0.1035573781, 0.0671166033, -0.0281106979, 0.035435874, 0.0353036523, -0.0472302027, -0.0327914059, -0.0582840815, -0.0433957241, -0.1697748601, 0.0236151014, -0.118683733, -0.1260882467, 0.0346425362, 0.0647365823, -0.0428932756, -0.0992733389, -0.1092694327, -0.0853634328, 0.0731459931, 0.0815554038, 0.0042542885, 0.0157478079, -0.1096925437, -0.0782762617, -0.0363614373, -0.0087531898, 0.0936670676, -0.0276875831, 0.0365201086, -0.0679099485, 0.0885896906, 0.017017154, 0.0732517689, 0.0172815993, -0.1060960665, -0.0361763276, 0.0429726094, 0.0893830284, 0.0581783019, -0.0124157788, 0.0205475185, 0.0734104365, -0.1198473051, -0.0464368649, 0.0911812633, 0.0216185283, 0.1254535764, -0.0823487416, -0.004330317, 0.019701289, -0.0018527806, 0.010201036, -0.0321831778, -0.0442419536, 0.024725778, -0.0296444893, 0.0412272587, 0.0486317724, -0.0173477121, 0.0027799972, 0.0616689995, -0.0116224382, 0.0648952499, 0.1489364505, 0.0044526234, 0.0525720306, 0.0068095056, -0.0699197426, 0.0703957453, 0.0707659721, -0.0184187219, -0.039746359, -0.0371547788, -0.0031799732, -0.0733046606, -0.0525191389, 0.0966817588, -0.0024692724, 0.0252282266, 0.0104853166, -0.0329765193, 0.0688090622, 0.113289021, 0.0112588238, 0.0681215003, -0.0251488928, 0.008673856, 0.0543173775, -0.0618805587, 0.0005689739, 0.1188952923, -0.0728286579, 0.0598707609, -0.0485259928, 0.0535240397 ]
711.4869
Shijun Zheng
Shijun Zheng
Time decay for Schroedinger equation with rough potentials
Six pages. Accepted for publication
null
null
null
math.AP
null
We obtain certain time decay and regularity estimates for 3D Schroedinger equation with a potential in the Kato class by using Besov spaces associated with Schroedinger operators.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 04:09:01 GMT" } ]
2007-12-03T00:00:00
[ [ "Zheng", "Shijun", "" ] ]
[ -0.0535092615, 0.0802159458, 0.0606534183, 0.0180641692, -0.0267066825, 0.0558107346, -0.0746540502, 0.0502008907, -0.0100569604, 0.0159784593, -0.0482829958, 0.0656399429, -0.0757088885, 0.0212406833, 0.0047707628, 0.0306863133, -0.0883669928, -0.0506803654, 0.0289841834, 0.0509201027, -0.1553494632, -0.1116214693, 0.0718730986, 0.0038507727, -0.0004139206, -0.016973367, 0.0897574723, -0.0811269432, 0.1067308336, -0.0583998933, -0.0119568743, -0.0620918386, -0.0892300457, -0.0044351313, -0.0606534183, 0.1003058925, -0.0258676037, 0.0985797867, -0.0808392614, -0.1885290444, 0.0152712362, -0.0286964979, -0.130992204, 0.028360866, 0.0347618386, 0.0043002795, -0.0112676313, 0.0235661305, 0.0651604682, 0.0578724705, -0.0460774191, 0.0829489455, 0.0444951542, -0.0395565778, 0.0474439189, -0.0904287323, 0.1152654663, 0.0606054701, 0.0567696802, -0.0534613132, 0.0453582071, -0.0992510468, -0.005079424, 0.0897095203, -0.1183340997, -0.0501529463, 0.01487567, 0.0282409992, -0.0331556052, 0.0484987609, -0.0637699962, 0.0361043662, 0.0511118919, 0.014360236, 0.0670783669, -0.0100749405, -0.0193227883, 0.0291519985, 0.088654682, 0.1398145258, 0.0449746288, 0.0244411696, 0.0223554596, 0.0388133936, -0.0840996802, -0.0643453673, 0.0034701906, -0.0540846288, -0.0082829073, 0.0646330491, -0.044327341, 0.1167997867, -0.0076476047, 0.0340666026, 0.0646809936, -0.0783459991, 0.0750855729, -0.0841955766, 0.0531256795, -0.0394127332, -0.0695236772, 0.0303746555, 0.0806954131, -0.0874080509, 0.0305664465, 0.0445910506, -0.0769555196, 0.0126581043, -0.1312798858, -0.0450465493, 0.0457657613, -0.0210369062, -0.1257179976, -0.0222116169, -0.0550915226, -0.0985797867, -0.0386695489, -0.0047617727, -0.0415463932, -0.0419059992, 0.0179922488, -0.0218280386, 0.0994428396, 0.0370872878, 0.0773390979, 0.005960457, 0.0209649857, -0.1334854662, -0.1014566272, -0.0721128359, -0.0603657328, -0.0699552074, -0.0629548877, -0.1348279864, -0.0143961962, -0.0224993005, -0.0092238747, 0.0568176284, 0.1027032584, 0.0621397868, 0.0460054986, 0.0538928397, 0.0049116081, 0.0603657328, -0.0014241866, 0.0925384164, 0.0251723677, -0.0609411001, -0.0411628149, -0.0097572887, -0.0230267216, -0.0122265778, 0.0209170375, 0.0301588923, 0.0738868937, 0.03924492, 0.0977167338, 0.066167362, -0.0041234735, 0.0233743414, 0.0802638903, 0.053077735, -0.0857778341, -0.0245969985, 0.1021278873, -0.0126341311, -0.0122205848, -0.0125622097, -0.0773870498, -0.0453342348, 0.0801200494, -0.1414447278, 0.0233024191, -0.0385736562, 0.0744143128, 0.0286964979, -0.0447348915, -0.0350255519, -0.0447588675, -0.0735033154, 0.1355951577, 0.0569614694, -0.0109200124, 0.0704826266, 0.0171771441, 0.0102307694, -0.0145040778, 0.1027032584, 0.0185196698, -0.029607499, -0.0137129463, 0.0947919413, 0.0355529711, 0.0019268848, -0.0257237609, -0.1284989417, -0.0264909193, 0.019970078, -0.0023838831, -0.0050314767, 0.0205214731, 0.0289841834, 0.0164579339, -0.0412826836, 0.0609890483, -0.0192508679, 0.0038777431, -0.0198621955, -0.0125622097, 0.0500570498, 0.0564819984, -0.0787775218, -0.0090380786, -0.0771473125, 0.0029832253, -0.0018999144, 0.009457618, 0.0484508127, 0.0104944799, 0.056721732, -0.1326224208, 0.1011689454, 0.0427211039, -0.0706264675, 0.0650645718, -0.08366815, 0.1012648344, 0.0448307879, 0.0824694708, -0.0125142625, 0.0321007632, -0.039940156, -0.0326281823, 0.0182679463, 0.0471082851, -0.0588314161, 0.0310698934, -0.0421457328, -0.1099912599, -0.0948878378, -0.0875039399, -0.0078034336, -0.0230866559, 0.0454780757, 0.0309020765, -0.0078274077, -0.0246689189, -0.0538928397, 0.0149356043, -0.1402939856, -0.0612287857, -0.0201858412, 0.1160326228, 0.0640097335, -0.0033443288, 0.0642015263 ]
711.487
Murray Olsen Dr
M.K. Olsen, A.S. Bradley
Bright bichromatic entanglement and quantum dynamics of sum frequency generation
null
null
10.1103/PhysRevA.77.023813
null
quant-ph
null
We investigate the quantum properties of the well-known process of sum frequency generation, showing that it is potentially a very useful source of non-classical states of the electromagnetic field, some of which are not possible with the more common techniques. We show that it can produce quadrature squeezed light, bright bichromatic entangled states and symmetric and asymmetric demonstrations of the Einstein-Podolsky-Rosen paradox. We also show that the semiclassical equations totally fail to describe the mean-field dynamics when the cavity is strongly pumped.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 04:38:31 GMT" } ]
2009-11-13T00:00:00
[ [ "Olsen", "M. K.", "" ], [ "Bradley", "A. S.", "" ] ]
[ -0.0046773949, 0.0426695682, -0.0374458097, 0.0590071343, -0.0759576932, 0.0134658329, 0.0492792204, 0.0216546059, -0.061885532, 0.0189094674, 0.0703608096, -0.0388583578, -0.0822475255, 0.0612458885, 0.1093790755, 0.0722264349, -0.0944007561, -0.0060466323, 0.0419499688, 0.0134058669, -0.1126839072, -0.0746251047, 0.0023353659, 0.0663630366, -0.0543963686, -0.1125772968, -0.05074507, 0.0602864213, 0.0882175341, -0.0255457722, 0.0860320851, -0.076117605, -0.0567683801, -0.0976522788, -0.1344317943, 0.2053256333, -0.0658833012, 0.059486866, -0.1429603696, 0.0117867682, -0.034114331, -0.0632714257, -0.0533036441, 0.1052746996, 0.1606571823, -0.0079822205, -0.030649595, -0.0664163381, 0.1019698679, -0.0094947116, 0.0245596543, -0.0043808934, 0.0854457393, -0.0339810736, -0.1167349815, -0.0330216065, -0.0074558472, 0.0351537541, -0.029583523, 0.010254289, 0.104954876, -0.1064473763, -0.0344075039, 0.0778766274, -0.0965328962, 0.0324885696, 0.0028300905, 0.0381654091, 0.0462942161, 0.0530637763, 0.0139655545, 0.0763841197, 0.0207484439, 0.0450415798, 0.0679088458, 0.0514646694, -0.0416567996, 0.0413902812, -0.0340077244, 0.0137923183, 0.1052213907, -0.0088084275, 0.0748916194, -0.0411237627, -0.0674291104, 0.0430160426, -0.0506651141, -0.0124064228, -0.1082063988, 0.0114669465, 0.0430160426, 0.0529838242, -0.0466406904, -0.0376856774, 0.0765973404, 0.0288905744, 0.0229472183, 0.0467206426, 0.0300632548, 0.0681753606, 0.0161510035, 0.0084686168, 0.0710537583, -0.0450948849, 0.097972095, -0.031475801, -0.0076090954, -0.0311826319, 0.0200688224, 0.0242265072, 0.0269316658, -0.0630049109, 0.0041676788, -0.0245463289, -0.0106740547, -0.0938677192, 0.077396892, -0.0244263951, -0.0135324625, 0.0152315162, -0.0522109196, -0.0330749117, 0.0079222545, 0.0359000042, 0.0057201474, -0.0229338929, 0.0891236961, -0.0662031248, -0.0119600054, 0.0143253542, 0.1293146461, 0.0137656657, 0.0279844124, -0.0183897577, -0.0103608957, -0.0497856028, 0.0275846366, -0.0234536026, -0.0045074895, 0.0706806332, 0.1492502093, -0.0189627707, 0.1297410727, -0.0057901083, 0.0486395769, 0.0872047618, -0.0562353432, -0.05602213, 0.0837933272, -0.0681753606, -0.0800087675, -0.1234512404, -0.0644974113, 0.0127262454, 0.0727061704, -0.1243041009, 0.0007841466, 0.1030892506, -0.0402176008, -0.0507717207, 0.1413612664, 0.0178034175, -0.0182431731, -0.0741453692, 0.0037978846, 0.0140854884, -0.1456255615, -0.0341409855, -0.0808616281, -0.0917355716, 0.0076823877, -0.0154180788, -0.0221609902, 0.0000487749, 0.0880043134, -0.0180033054, -0.0322753564, -0.1475444883, -0.0649238378, -0.0461876094, 0.0299566481, -0.0460543483, 0.0243997425, 0.0357933976, 0.021534672, -0.0019505803, 0.0070227552, 0.014192095, 0.0788360909, -0.0508783273, -0.0493325219, 0.0410438068, 0.0225074645, 0.0361931734, -0.001626594, -0.1191869453, 0.0308095068, 0.0337678604, -0.0232936926, -0.0921086967, 0.0203353409, -0.0123331305, 0.1074601486, -0.007509151, -0.0541565008, 0.0077623432, 0.1644950509, 0.0718533099, -0.0602864213, 0.0500254706, 0.0487461835, 0.0474668965, 0.1259032041, -0.0220543835, -0.0458144806, -0.0684418827, -0.0484263599, 0.0412570201, -0.0934412852, 0.050531853, -0.0981853157, 0.0191360079, -0.0139522292, 0.098398529, -0.005147133, 0.0740920678, -0.0109672248, 0.0148717165, 0.0307562035, -0.0086884936, 0.031928882, -0.0204152949, -0.0776634067, 0.0588472225, -0.0115202498, 0.0178833734, 0.0864052102, 0.0025685693, -0.03629978, -0.0320887938, 0.0437089875, 0.0299566481, 0.0153647754, 0.0432292558, -0.0348339304, 0.0751581416, -0.0229072403, 0.0431226492, 0.0313958451, -0.0476801097, -0.0502653383, 0.1322996467, -0.0563419536, 0.0541565008, -0.0083886608, 0.0053103757 ]
711.4871
Alexander Roitershtein
Iddo Ben-Ari, Mathieu Merle, Alexander Roitershtein
A random walk on Z with drift driven by its occupation time at zero
null
null
null
null
math.PR
null
We consider a nearest neighbor random walk on the one-dimensional integer lattice with drift towards the origin determined by an asymptotically vanishing function of the number of visits to zero. We show the existence of distinct regimes according to the rate of decay of the drift. In particular, when the rate is sufficiently slow, the position of the random walk, properly normalized, converges to a symmetric exponential law. In this regime, in contrast to the classical case, the range of the walk scales differently from its position.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 04:43:11 GMT" } ]
2007-12-03T00:00:00
[ [ "Ben-Ari", "Iddo", "" ], [ "Merle", "Mathieu", "" ], [ "Roitershtein", "Alexander", "" ] ]
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711.4872
Atilla Yilmaz
Atilla Yilmaz
Large deviations for random walk in a space--time product environment
Published in at http://dx.doi.org/10.1214/08-AOP400 the Annals of Probability (http://www.imstat.org/aop/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Annals of Probability 2009, Vol. 37, No. 1, 189-205
10.1214/08-AOP400
IMS-AOP-AOP400
math.PR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider random walk $(X_n)_{n\geq0}$ on $\mathbb{Z}^d$ in a space--time product environment $\omega\in\Omega$. We take the point of view of the particle and focus on the environment Markov chain $(T_{n,X_n}\omega)_{n\geq0}$ where $T$ denotes the shift on $\Omega$. Conditioned on the particle having asymptotic mean velocity equal to any given $\xi$, we show that the empirical process of the environment Markov chain converges to a stationary process $\mu_{\xi}^{\infty}$ under the averaged measure. When $d\geq3$ and $\xi$ is sufficiently close to the typical velocity, we prove that averaged and quenched large deviations are equivalent and when conditioned on the particle having asymptotic mean velocity $\xi$, the empirical process of the environment Markov chain converges to $\mu_{\xi}^{\infty}$ under the quenched measure as well. In this case, we show that $\mu_{\xi}^{\infty}$ is a stationary Markov process whose kernel is obtained from the original kernel by a Doob $h$-transform.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 05:25:49 GMT" }, { "version": "v2", "created": "Sun, 6 Apr 2008 22:14:42 GMT" }, { "version": "v3", "created": "Mon, 7 Mar 2011 06:55:20 GMT" } ]
2011-03-08T00:00:00
[ [ "Yilmaz", "Atilla", "" ] ]
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711.4873
Laszlo L. Kiss
T.T. Moon, S.A. Otero, L.L. Kiss
Combining Visual and Photoelectric Observations of Semi-Regular Red Variables
accepted for publication in the Journal of the AAVSO
null
null
null
astro-ph
null
Combining visual observations of SR variables with measurements of them using a photoelectric photometer is discussed then demonstrated using data obtained for the bright, southern SR variable theta Aps. Combining such observations is useful in that it can provide a more comprehensive set of data by extending the temporal coverage of the light curve. Typically there are systematic differences in the visual and photometric datasets that must be corrected for.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 05:26:54 GMT" } ]
2007-12-03T00:00:00
[ [ "Moon", "T. T.", "" ], [ "Otero", "S. A.", "" ], [ "Kiss", "L. L.", "" ] ]
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711.4874
Subrata Sarangi
S. Sarangi, P. K. Panda, S. K. Sahu and L. Maharana
Asymmetric Nuclear Matter with Pion Dressing
12 pages, 9 figures, 1 table
null
null
null
nucl-th
null
We discuss a self-consistent method to calculate the properties of cold asymmetric nuclear matter which is dressed with isoscalar scalar pion condensates. The nucleon-nucleon interaction is mediated by these pion pairs, omega- and rho- mesons. The parameters of these interactions are evaluated self-consistently using the saturation properties of nuclear matter like binding energy, pressure, compressibility and symmetry energy. The computed equation of state of pure neutron matter (PNM) is used to calculate mass and radius of a pure neutron star.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 05:39:39 GMT" } ]
2007-12-03T00:00:00
[ [ "Sarangi", "S.", "" ], [ "Panda", "P. K.", "" ], [ "Sahu", "S. K.", "" ], [ "Maharana", "L.", "" ] ]
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711.4875
Sergiy Vasylkevych
Sergiy Vasylkevych and Jerrold E. Marsden
The Lie-Poisson Structure of the Euler Equations of an Ideal Fluid
24 pages
Dynamics of PDE, Vol.2, No.4, 281-300, 2005
null
null
math.AP math.DG
null
This paper provides a precise sense in which the time t map for the Euler equations of an ideal fluid in a region in R^n (or a smooth compact n-manifold with boundary) is a Poisson map relative to the Lie-Poisson bracket associated with the group of volume preserving diffeomorphism group. This is interesting and nontrivial because in Eulerian representation, the time t maps need not be C^1 from the Sobolev class H^s to itself (where s > (n/2) + 1). The idea of how this difficulty is overcome is to exploit the fact that one does have smoothness in the Lagrangian representation and then carefully perform a Lie-Poisson reduction procedure.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 06:26:17 GMT" } ]
2007-12-03T00:00:00
[ [ "Vasylkevych", "Sergiy", "" ], [ "Marsden", "Jerrold E.", "" ] ]
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711.4876
Myung-Sin Song
Palle E.T. Jorgensen, Myung-Sin Song
Optimal Decompositions of Translations of $L^{2}$-functions
30 pages, 3 figures
null
null
null
math.FA math.SP
null
In this paper we offer a computational approach to the spectral function for a finite family of commuting operators, and give applications. Motivated by questions in wavelets and in signal processing, we study a problem about spectral concentration of integral translations of functions in the Hilbert space $L^{2}(\mathbb{R}^{n})$. Our approach applies more generally to families of $n$ arbitrary commuting unitary operators in a complex Hilbert space $\mathcal{H}$, or equivalent the spectral theory of a unitary representation $U$ of the rank-$n$ lattice $\mathbb{Z}^{n}$ in $\mathbb{R}^{n}$. Starting with a non-zero vector $\psi \in \mathcal{H}$, we look for relations among the vectors in the cyclic subspace in $\mathcal{H}$ generated by $\psi$. Since these vectors $\{U(k)\psi | k \in \mathbb{Z}^{n}\}$ involve infinite ``linear combinations," the problem arises of giving geometric characterizations of these non-trivial linear relations. A special case of the problem arose initially in work of Kolmogorov under the name $L^{2}$-independence. This refers to \textit{infinite} linear combinations of integral translates of a fixed function with $l^{2}$-coefficients. While we were motivated by the study of translation operators arising in wavelet and frame theory, we stress that our present results are general; our theorems are about spectral densities for general unitary operators, and for stochastic integrals.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 06:14:01 GMT" } ]
2007-12-03T00:00:00
[ [ "Jorgensen", "Palle E. T.", "" ], [ "Song", "Myung-Sin", "" ] ]
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711.4877
Hyunsoo Min
Gerald V. Dunne, Jin Hur, Choonkyu Lee, Hyunsoo Min
Renormalized Effective Actions in Radially Symmetric Backgrounds: Exact Calculations Versus Approximation Methods
30 pages, 9 figures, RevTex
Phys.Rev.D77:045004,2008
10.1103/PhysRevD.77.045004
null
hep-th
null
Our previously-developed calculational method (the partial wave cutoff method) is employed to evaluate explicitly scalar one-loop effective actions in a class of radially symmetric background gauge fields. Our method proves to be particularly effective when it is used in conjunction with a systematic WKB series for the large partial wave contribution to the effective action. By comparing these numerically exact calculations against the predictions based on the large mass expansion and derivative expansion, we discuss the validity ranges of the latter approximation methods.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 06:13:24 GMT" } ]
2008-11-26T00:00:00
[ [ "Dunne", "Gerald V.", "" ], [ "Hur", "Jin", "" ], [ "Lee", "Choonkyu", "" ], [ "Min", "Hyunsoo", "" ] ]
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711.4878
Raphael Flauger
Elena Caceres, Raphael Flauger, Matthias Ihl, Timm Wrase
New Supergravity Backgrounds Dual to N=1 SQCD-like Theories with N_f=2N_c
22+24 pages, 17 figures, Figure 12 replaced
JHEP 0803:020,2008
10.1088/1126-6708/2008/03/020
UTTG-09-07
hep-th
null
We present new supergravity backgrounds generated by N_c D5-branes, wrapping the S^2 of the resolved conifold, in the presence of N_f = 2 N_c smeared flavor D5-branes. The smearing allows us to take their backreaction on the geometry into account. We discuss the consistency, stability, and supersymmetry of these types of setups. We find near horizon geometries that we expect to be supergravity duals of SQCD-like theories with N_f= 2N_c. From these backgrounds we numerically extract rectangular Wilson loops and beta functions of the dual field theory for the regime where our approximations are valid.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 06:31:15 GMT" }, { "version": "v2", "created": "Sat, 1 Dec 2007 23:25:08 GMT" } ]
2009-11-19T00:00:00
[ [ "Caceres", "Elena", "" ], [ "Flauger", "Raphael", "" ], [ "Ihl", "Matthias", "" ], [ "Wrase", "Timm", "" ] ]
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711.4879
Hideo Iwase
Hideo Iwase, Dirk Englund, Jelena Vuckovic
Spontaneous emission control in high-extraction efficiency plasmonic crystals
Spontaneous emission control in high-extraction efficiency plasmonic crystals
null
10.1364/OE.16.000426
null
physics.optics
null
We experimentally and theoretically investigate exciton-field coupling for the surface plasmon polariton (SPP) in waveguide-confined (WC) anti-symmetric modes of hexagonal plasmonic crystals in InP-TiO-Au-TiO-Si heterostructures. The radiative decay time of the InP-based transverse magnetic (TM)-strained multi-quantum well (MQW) coupled to the SPP modes is observed to be 2.9-3.7 times shorter than that of a bare MQW wafer. Theoretically we find that 80 % of the enhanced PL is emitted into SPP modes, and 17 % of the enhanced luminescence is redirected into WC-anti-symmetric modes. In addition to the direct coupling of the excitons to the plasmonic modes, this demonstration is also useful for the development of high-temperature SPP lasers, the development of highly integrated photo-electrical devices, or miniaturized biosensors.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 06:31:18 GMT" } ]
2009-11-13T00:00:00
[ [ "Iwase", "Hideo", "" ], [ "Englund", "Dirk", "" ], [ "Vuckovic", "Jelena", "" ] ]
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711.488
Koji Nishida
Yayoi Kinoshita, Koji Nishida, Kensuke Sakata, Ryuta Shinya
An upper bound on the reduction number of an ideal
9 pages
null
null
null
math.AC
null
Let A be a commutative ring and I an ideal of A with a reduction Q. In this paper we give an upper bound on the reduction number of I with respect to Q, when a suitable family of ideals in A is given. As a corollary it follows that if some ideal J containing I satisfies J^2 = QJ, then I^{v + 2} = QI^{v + 1}, where v denotes the number of generators of J / I as an A-module.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 06:40:41 GMT" } ]
2007-12-03T00:00:00
[ [ "Kinoshita", "Yayoi", "" ], [ "Nishida", "Koji", "" ], [ "Sakata", "Kensuke", "" ], [ "Shinya", "Ryuta", "" ] ]
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711.4881
Qing-Feng Sun
Juntao Song, Qing-feng Sun, Jinhua Gao, X.C. Xie
Measuring the phonon-assisted spectral function by using a non-quilibrium three-terminal single-molecular device
9 pages, 5 figures
Phys. Rev. B 75, 195320 (2007)
10.1103/PhysRevB.75.195320
null
cond-mat.mes-hall
null
The electron transport through a three-terminal single-molecular transistor (SMT) is theoretically studied. We find that the differential conductance of the third and weakly coupled terminal versus its voltage matches well with the spectral function versus the energy when certain conditions are met. Particularly, this excellent matching is maintained even for complicated structure of the phonon-assisted side peaks. Thus, this device offers an experimental approach to explore the shape of the phonon-assisted spectral function in detail. In addition we discuss the conditions of a perfect matching. The results show that at low temperatures the matching survives regardless of the bias and the energy levels of the SMT. However, at high temperatures, the matching is destroyed.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 07:41:27 GMT" } ]
2009-11-13T00:00:00
[ [ "Song", "Juntao", "" ], [ "Sun", "Qing-feng", "" ], [ "Gao", "Jinhua", "" ], [ "Xie", "X. C.", "" ] ]
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711.4882
Qing-Feng Sun
Juntao Song, Qing-feng Sun, Hua Jiang, X. C. Xie
Transmission phase shift of phonon-assisted tunneling through a quantum dot
8 pages, 6 figures, accepted by Phys. Rev. B
Phys. Rev. B 77, 035309 (2008)
10.1103/PhysRevB.77.035309
null
cond-mat.mes-hall
null
The influence of electron-phonon interaction on the transmission phase shift of an electron passing through a quantum dot is investigated by using the scattering theory. The transmission phase versus the intra-dot level shows a serial of phonon-induced dips. These dips are highly sensitive to electron-phonon interaction strength $\lambda$, and they are much more pronounced than phonon-assisted sub-peaks appeared in the conductance. Phonon-induce dephasing is also studied, and the results show that the dephasing probability $T_d$ monotonically increases with the electron-phonon interaction strength $\lambda$. The dephasing probability $T_d \propto\lambda^2$ for small $\lambda$ but $T_d\propto \lambda$ at large $\lambda$.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 07:55:16 GMT" } ]
2009-11-13T00:00:00
[ [ "Song", "Juntao", "" ], [ "Sun", "Qing-feng", "" ], [ "Jiang", "Hua", "" ], [ "Xie", "X. C.", "" ] ]
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711.4883
Roshanak Alimohammadi
Roshanak Alimohammadi
Comparison of Spline with Kriging in an Epidemiological Problem
Submitted to the Electronic Journal of Statistics (http://www.i-journals.org/ejs/) by the Institute of Mathematical Statistics (http://www.imstat.org)
null
null
IMS-EJS-EJS_2007_155
stat.AP
null
There are various methods to analyze different kinds of data sets. Spatial data is defined when data is dependent on each other based on their respective locations. Spline and Kriging are two methods for interpolating and predicting spatial data. Under certain conditions, these methods are equivalent, but in practice they show different behaviors. Amount of data can be observed only at some positions that are chosen as positions of sample points, therefore, prediction of data values in other positions is important. In this paper, the link between Spline and Kriging methods is described, then for an epidemiological two dimensional real data set, data is observed in geological longitude and in latitude dimensions, and behavior of these methods are investigated. Comparison of these performances show that for this data set, Kriging method has a better performance than Spline method.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 08:44:03 GMT" } ]
2009-08-21T00:00:00
[ [ "Alimohammadi", "Roshanak", "" ] ]
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711.4884
Rok Zitko
Rok Zitko, Janez Bonca
Quantum phase transitions in the systems of parallel quantum dots
5 pages, 4 figures
Phys. Rev. B 76, 241305(R) (2007)
10.1103/PhysRevB.76.241305
null
cond-mat.mes-hall cond-mat.str-el
null
We study the low-temperature transport properties of the systems of parallel quantum dots described by the N-impurity Anderson model. We calculate the quasiparticle scattering phase shifts, spectral functions and correlations as a function of the gate voltage for N up to 5. For any N, the conductance at the particle-hole symmetric point is unitary. For N >= 2, a transition from ferromagnetic to antiferromagnetic impurity spin correlations occurs at some gate voltage. For N >= 3, there is an additional transition due to an abrupt change in average impurity occupancy. For odd N, the conductance is discontinuous through both quantum phase transitions, while for even N only the magnetic transition affects the conductance. Similar effects should be experimentally observable in the systems of quantum dots with ferromagnetic conduction-band-mediated inter-dot exchange interactions.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 08:30:17 GMT" } ]
2009-03-05T00:00:00
[ [ "Zitko", "Rok", "" ], [ "Bonca", "Janez", "" ] ]
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711.4885
John Hartnett
John G. Hartnett, Koichi Hirano
Galaxy redshift abundance periodicity from Fourier analysis of number counts $N(z)$ using SDSS and 2dF GRS galaxy surveys
15 pages, 22 figures, revised, accepted for publication in Ap&SS
null
10.1007/s10509-008-9906-4
null
astro-ph gr-qc
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A Fourier analysis on galaxy number counts from redshift data of both the Sloan Digital Sky Survey and the 2dF Galaxy Redshift Survey indicates that galaxies have preferred periodic redshift spacings of $\Delta z =$ 0.0102, 0.0246, and 0.0448 in the SDSS and strong agreement with the results from the 2dF GRS. The redshift spacings are confirmed by the mass density fluctuations, the power spectrum $P(z)$ and $N_{pairs}$ calculations. Application of the Hubble law results in galaxies preferentially located on co-moving concentric shells with periodic spacings. The combined results from both surveys indicate regular co-moving radial distance spacings of $31.7 \pm 1.8$ $h^{-1} Mpc$, $73.4 \pm 5.8$ $h^{-1} Mpc$ and $127 \pm 21$ $h^{-1} Mpc$. The results are consistent with oscillations in the expansion rate of the universe over past epochs.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 08:33:30 GMT" }, { "version": "v2", "created": "Fri, 8 Feb 2008 06:24:24 GMT" }, { "version": "v3", "created": "Thu, 11 Sep 2008 16:07:30 GMT" } ]
2008-09-11T00:00:00
[ [ "Hartnett", "John G.", "" ], [ "Hirano", "Koichi", "" ] ]
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711.4886
Paulin-Henriksson Stephane
S. Paulin-Henriksson, A. Amara, L. Voigt, A. Refregier and S.L. Bridle
PSF calibration requirements for dark energy from cosmic shear
13 pages, 4 figures, accepted by A&A
null
10.1051/0004-6361:20079150
null
astro-ph
null
The control of systematic effects when measuring galaxy shapes is one of the main challenges for cosmic shear analyses. In this context, we study the fundamental limitations on shear accuracy due to the measurement of the Point Spread Function (PSF) from the finite number of stars. In order to do that, we translate the accuracy required for cosmological parameter estimation to the minimum number of stars over which the PSF must be calibrated. We first derive our results analytically in the case of infinitely small pixels (i.e. infinitely high resolution). Then image simulations are used to validate these results and investigate the effect of finite pixel size in the case of an elliptical gaussian PSF. Our results are expressed in terms of the minimum number of stars required to calibrate the PSF in order to ensure that systematic errors are smaller than statistical errors when estimating the cosmological parameters. On scales smaller than the area containing this minimum number of stars, there is not enough information to model the PSF. In the case of an elliptical gaussian PSF and in the absence of dithering, 2 pixels per PSF Full Width at Half Maximum (FWHM) implies a 20% increase of the minimum number of stars compared to the ideal case of infinitely small pixels; 0.9 pixels per PSF FWHM implies a factor 100 increase. In the case of a good resolution and a typical Signal-to-Noise Ratio distribution of stars, we find that current surveys need the PSF to be calibrated over a few stars, which may explain residual systematics on scales smaller than a few arcmins. Future all-sky cosmic shear surveys require the PSF to be calibrated over a region containing about 50 stars.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 09:38:39 GMT" }, { "version": "v2", "created": "Mon, 28 Apr 2008 19:07:26 GMT" } ]
2009-11-13T00:00:00
[ [ "Paulin-Henriksson", "S.", "" ], [ "Amara", "A.", "" ], [ "Voigt", "L.", "" ], [ "Refregier", "A.", "" ], [ "Bridle", "S. L.", "" ] ]
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711.4887
Henrik Jeldtoft Jensen
Vasils Hatzopoulos and Henrik Jeldtoft Jensen
The prisoners dilemma on a stochastic non-growth network evolution model
8 pages, 8 figures
null
10.1103/PhysRevE.78.011904
null
q-bio.PE q-bio.OT
null
We investigate the evolution of cooperation on a non - growth network model with death/birth dynamics. Nodes reproduce under selection for higher payoffs in a prisoners dilemma game played between network neighbours. The mean field characteristics of the model are explored and an attempt is made to understand the size dependent behaviour of the model in terms of fluctuations in the strategy densities. We also briefly comment on the role of strategy mutation in regulating the strategy densties.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 08:49:41 GMT" } ]
2009-11-13T00:00:00
[ [ "Hatzopoulos", "Vasils", "" ], [ "Jensen", "Henrik Jeldtoft", "" ] ]
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711.4888
Xavier Barcons
X. Barcons (IFCA, Csic-Uc)
Searching for the Missing Baryons in the Warm-Hot Intergalactic Medium
Proceedings of the "XMM-Newton: the next decade", to appear in Astronomische Nachrichten
null
10.1002/asna.200710893
null
astro-ph
null
At low redshift (z<2), almost half of the baryons in the Universe are not found in bound structures like galaxies and clusters and therefore most likely reside in a Warm-Hot Intergalactic Medium (WHIM), as predicted by simulations. Attempts to detect WHIM filaments at cosmological distances in absorption towards bright background sources have yielded controversial results that I review here. I argue that a secure detection of absorption features by the WHIM is at the limit of the XMM-Newton capabilities, but feasible. A proper characterisation of the whole WHIM belongs to the realm of future X-ray missions.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 09:25:19 GMT" } ]
2009-11-13T00:00:00
[ [ "Barcons", "X.", "", "IFCA, Csic-Uc" ] ]
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711.4889
Henning Flaecher
The BABAR Collaboration: B. Aubert, et al
Measurement of the B --> X_s gamma Branching Fraction and Photon Energy Spectrum using the Recoil Method
9 pages, 2 postscript figures, updated references for v2
Phys.Rev.D77:051103,2008
10.1103/PhysRevD.77.051103
BABAR-PUB-07/067, SLAC-PUB-13021
hep-ex hep-ph
null
We present a measurement of the branching fraction and photon energy spectrum for the decay B --> X_s gamma using data from the BaBar experiment. The data sample corresponds to an integrated luminosity of 210 fb^{-1}, from which approximately 680 000 BB events are tagged by a fully reconstructed hadronic decay of one of the B mesons. In the decay of the second B meson, an isolated high--energy photon is identified. We measure BR(B --> X_s gamma) = (3.66 +- 0.85_{stat} +- 0.60_{syst}) x 10^{-4} for photon energies E_gamma above 1.9 GeV in the B rest frame. From the measured spectrum we calculate the first and second moments for different minimum photon energies, which are used to extract the heavy-quark parameters m_b and mu_{pi}^2. In addition, measurements of the direct CP asymmetry and isospin asymmetry are presented.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 10:06:50 GMT" }, { "version": "v2", "created": "Thu, 13 Mar 2008 23:26:31 GMT" } ]
2010-04-12T00:00:00
[ [ "The BABAR Collaboration", "", "" ], [ "Aubert", "B.", "" ] ]
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711.489
Michal Kreps
Michal Kreps (for the CDF and D0 Collaboration)
D and B meson spectroscopy, new states, baryons at the Tevatron
To appear in the proceedings of International Conference On Hadron Spectroscopy (Hadron 07), 8-13 Oct 2007, Frascati, Italy
null
null
FERMILAB-CONF-07-637-E
hep-ex
null
We review recent results in heavy quark hadron spectroscopy at the Tevatron. With increasing data samples the Tevatron experiments start to uncover information on the b-hadrons. Most important are the first observations of the narrow Bs** as well as Sigma_b, Sigma_b* and Xi_b- baryons. In addition we present updated results on the narrow B** and Bc mesons.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 09:35:46 GMT" } ]
2019-08-14T00:00:00
[ [ "Kreps", "Michal", "", "for the CDF and D0 Collaboration" ] ]
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711.4891
Ronojoy Adhikari
R. Adhikari and S. Succi
Duality in matrix lattice Boltzmann models
12 pages, 3 figures
null
10.1103/PhysRevE.78.066701
null
cond-mat.stat-mech
null
The notion of duality between the hydrodynamic and kinetic (ghost) variables of lattice kinetic formulations of the Boltzmann equation is introduced. It is suggested that this notion can serve as a guideline in the design of matrix versions of the lattice Boltzmann equation in a physically transparent and computationally efficient way.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 09:43:14 GMT" } ]
2009-11-13T00:00:00
[ [ "Adhikari", "R.", "" ], [ "Succi", "S.", "" ] ]
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711.4892
Jonathan Tennenbaum
Danil Doubochinski, Jonathan Tennenbaum
The Macroscopic Quantum Effect in Nonlinear Oscillating Systems: a Possible Bridge between Classical and Quantum Physics
12 pages, 2 figures. Paper presented at Seminar "Atomic Structure: New Ideas and Perspectives", Moscow, Jan. 15, 2007
null
null
null
physics.gen-ph
null
Einstein, De Broglie and others hoped that the schism between classical and quantum physics might one day be overcome by a theory taking into account the essential nonlinearity of elementary physical processes. However, neither their attempts, nor subsequent ones were able to supply a unifying principle that could serve as a starting-point for a coherent understanding of both microphysical and macroscopic phenomena. In the late 1960s the phenomenon of amplitude quantization, or Macroscopic Quantum Effect (MQE), was discovered in a class of nonlinear oscillating systems in which two or more subsystems are coupled to each other by interactions having a specific phase-dependent character -- so-called argumental interactions. Experimental and theoretical studies of the MQE, carried out up to the present time, suggest the possibility of a new conceptual framework for physics, which would provide a bridge between classical and quantum physics, replacing the Newtonian notion of "force" by a new conception of physical interaction. The present paper presents a brief introduction to the MQE and some ideas about its possible significance in the search for new approaches to the understanding of quantum phenomena.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 09:51:36 GMT" } ]
2008-08-08T00:00:00
[ [ "Doubochinski", "Danil", "" ], [ "Tennenbaum", "Jonathan", "" ] ]
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711.4893
Changzheng Yuan
Chang-Zheng Yuan (for the BES collaboration)
Recent BES results on charmonium decays
8 pages
null
null
null
hep-ex
null
In this talk, we present the recent results on charmonium decays from the BES experiment at the BEPC collider. The analyses are based on a 14 million psi(2S) events data sample. We report results on leptonic decays, hadronic decays, and radiative decays of psi(2S), as well as hadronic decays of chi_cJ states and rare or forbidden decays of J/psi.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 10:05:00 GMT" } ]
2019-08-13T00:00:00
[ [ "Yuan", "Chang-Zheng", "", "for the BES collaboration" ] ]
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711.4894
Kang Sin Choi
Kang-Sin Choi and Tatsuo Kobayashi
Higher Order Couplings from Heterotic Orbifold Theory
32+1 pages, 5 figures
Nucl.Phys.B797:295-321,2008
10.1016/j.nuclphysb.2008.01.016
KUNS-2112
hep-th
null
We calculate couplings of arbitrary order from correlation functions among twisted strings, using conformal field theory. Twisted strings arise in heterotic string compactified on orbifolds yielding matter fields in the low energy limit. We calculate completely the classical and the quantum amplitude including normalization, up to a contribution from Kahler potential. The classical action has saddle points which are interpreted as worldsheet instantons described by metastable untwisted strings, formed by twisted strings distributed at certain fixed points. This understanding generalizes the area rule, in the case that the locations of twisted strings do not form a polygon, and provides a general rule for calculating these kinds of instanton corrections. An interpretation of couplings involving linearly combined states is given, which commonly appear in non-prime order orbifolds. The quantum part of the amplitude is given by ratios of gamma functions with order one arguments.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 10:17:24 GMT" } ]
2008-11-26T00:00:00
[ [ "Choi", "Kang-Sin", "" ], [ "Kobayashi", "Tatsuo", "" ] ]
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711.4895
Ole Host
J. D. Vergados, S. H. Hansen, O. Host
The impact of going beyond the Maxwell distribution in direct dark matter detection rates
13 pages, 10 figures, accepted by Phys. Rev. D
Phys.Rev.D77:023509,2008
10.1103/PhysRevD.77.023509
null
astro-ph hep-ph
null
We consider direct dark matter detection rates and investigate the difference between a standard Maxwell-Boltzmann velocity distribution and a "realistic" distribution like the ones extracted from numerical N-body simulations. Sizable differences are observed when such results are compared to the standard Maxwell-Boltzmann distribution. For a light target both the total rate and the annual modulation are reduced by ~25%. For a heavy target the total rate is virtually unchanged, whereas the annual modulation is modified by up to 50%, depending on the WIMP mass and detector energy threshold. We also consider the effect of a possible velocity anisotropy, and the effect is found to be largest for a light target For the realistic velocity distribution the anisotropy may reduce the annual modulation, in contrast to the Maxwell-Boltzmann case.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 10:08:57 GMT" } ]
2008-12-18T00:00:00
[ [ "Vergados", "J. D.", "" ], [ "Hansen", "S. H.", "" ], [ "Host", "O.", "" ] ]
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711.4896
Thomas Barthel
Thomas Barthel, Ulrich Schollw\"ock
Dephasing and the steady state in quantum many-particle systems
4 pages, 3 figures, minor changes
Phys. Rev. Lett. 100, 100601 (2008)
10.1103/PhysRevLett.100.100601
null
cond-mat.stat-mech
null
We discuss relaxation in bosonic and fermionic many-particle systems. For integrable systems, the time evolution can cause a dephasing effect, leading for finite subsystems to certain steady states. We give an explicit derivation of those steady subsystem states and devise sufficient prerequisites for the dephasing to take place. We also find simple scenarios, in which dephasing is ineffective and discuss the dependence on dimensionality and criticality. It follows further that, after a quench of system parameters, bipartite entanglement entropy will become extensive. This provides a way of creating strong entanglement in a controlled fashion.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 10:13:53 GMT" }, { "version": "v2", "created": "Wed, 9 Apr 2008 08:34:01 GMT" } ]
2008-04-09T00:00:00
[ [ "Barthel", "Thomas", "" ], [ "Schollwöck", "Ulrich", "" ] ]
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711.4897
Cl\'audio Nassif Cruz
Claudio Nassif
Deformed special relativity with an invariant minimum speed and its cosmological implications
7 pages, 3 figures. arXiv admin note: substantial text overlap with arXiv:0705.4315, arXiv:0709.1727
Pramana Journal of Physics, Vol.71, No.1, p.1-13 (2008); correlated paper in: http://www.worldscientific.com/worldscinet/ijmpd?journalTabs=read
10.1007/s12043-008-0136-7
null
gr-qc
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The paper aims to introduce a new symmetry principle in the space-time geometry through the elimination of the classical idea of rest and by including a universal minimum limit of speed in the subatomic world. Such a limit, unattainable by particles, represents a preferred reference frame associated with a universal background field that breaks Lorentz symmetry. Thus the structure of space-time is extended due to the presence of a vacuum energy density, which leads to a negative pressure at cosmological scales. The tiny values of the cosmological constant and the vacuum energy density shall be successfully obtained, being in good agreement with current observational results.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 10:14:14 GMT" }, { "version": "v2", "created": "Mon, 3 Dec 2007 22:58:36 GMT" }, { "version": "v3", "created": "Mon, 25 Feb 2008 17:55:51 GMT" }, { "version": "v4", "created": "Tue, 26 Feb 2008 12:49:10 GMT" }, { "version": "v5", "created": "Tue, 13 Nov 2012 09:48:08 GMT" }, { "version": "v6", "created": "Wed, 4 Sep 2013 19:58:57 GMT" }, { "version": "v7", "created": "Mon, 7 Nov 2016 11:27:27 GMT" } ]
2016-11-08T00:00:00
[ [ "Nassif", "Claudio", "" ] ]
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711.4898
Pieter Moree
Chun-Gang Ji, Wei-Ping Li and Pieter Moree
Values of coefficients of cyclotomic polynomials II
5 pages
Discrete Math. 309 (2009), 1720-1723
null
null
math.NT
null
Let a(n,k) be the kth coefficient of the nth cyclotomic polynomial. The first two authors showed in part I that if m is a prime power and n and k range over the non-negative integers, then a(mn,k) assumes every integer value. Here this result is extended to the case where m is arbitrary. The proof use some properties of reciprocal cyclotomic polynomials (see arXiv:0709.1570).
[ { "version": "v1", "created": "Fri, 30 Nov 2007 10:49:50 GMT" } ]
2012-07-30T00:00:00
[ [ "Ji", "Chun-Gang", "" ], [ "Li", "Wei-Ping", "" ], [ "Moree", "Pieter", "" ] ]
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711.4899
Jos\'e F. Carinena
J.F. Cari\~nena, A.M. Perelomov, M.F. Ra\~nada and M. Santander
A quantum exactly solvable non-linear oscillator related with the isotonic oscillator
11 pages, 11 figures
J. Phys. A: Math. Theor. 41, 085301 (10 p.) (2008)
10.1088/1751-8113/41/8/085301
null
quant-ph
null
A nonpolynomial one-dimensional quantum potential representing an oscillator, that can be considered as placed in the middle between the harmonic oscillator and the isotonic oscillator (harmonic oscillator with a centripetal barrier), is studied. First the general case, that depends of a parameter $a$, is considered and then a particular case is studied with great detail. It is proven that it is Schr\"odinger solvable and then the wave functions $\Psi_n$ and the energies $E_n$ of the bound states are explicitly obtained. Finally it is proven that the solutions determine a family of orthogonal polynomials ${\cal P}_n(x)$ related with the Hermite polynomials and such that: (i) Every ${\cal P}_n$ is a linear combination of three Hermite polynomials, and (ii) They are orthogonal with respect to a new measure obtained by modifying the classic Hermite measure.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 10:51:58 GMT" } ]
2010-11-16T00:00:00
[ [ "Cariñena", "J. F.", "" ], [ "Perelomov", "A. M.", "" ], [ "Rañada", "M. F.", "" ], [ "Santander", "M.", "" ] ]
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711.49
Maria Krawczyk
Maria Krawczyk (U. of Warsaw) and Dorota Sokolowska (U. of Warsaw)
The charged Higgs boson mass in the 2HDM: decoupling and CP violation
Oct. 2007, 5 pages, 2 figures, Presented at 2007 International Linear Collider Workshop (LCWS07 and ILC07), Hamburg, Germany, 30 May - 3 Jun 2007
ECONF C0705302:HIG09,2007
null
IFT UW 13/07, CERN-PH-TH-2007-246
hep-ph
null
Mass range of the charged Higgs boson in the 2HDM with explicit and spontaneous CP violation is discussed. Constraints on M_H+ in the CP conserving 2HDM(II) are shown.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 10:58:55 GMT" } ]
2009-02-16T00:00:00
[ [ "Krawczyk", "Maria", "", "U. of Warsaw" ], [ "Sokolowska", "Dorota", "", "U. of Warsaw" ] ]
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711.4901
Alessandro Sozzetti
A. Sozzetti (1,2), G. Torres (1), D.W. Latham (1), B.W. Carney (3), J.B. Laird (4), R.P. Stefanik (1), A.P. Boss (5), D. Charbonneau (1), F.T. O'Donovan (6), M.J. Holman (1), J.N. Winn (7) ((1) CfA, (2) OATo, (3) UNC, (4) BGSU, (5) CIW, (6), NASA Goddard, (7) MIT)
Observational Tests of Planet Formation Models
2 pages, no figures. To appear in the proceedings of "IAU conference 249: Exoplanets: Detection, Formation and Dynamics", held in Suzhou, China, 22-26 Oct. 2007
null
10.1017/S1743921308016669
null
astro-ph
null
We summarize the results of two experiments to address important issues related to the correlation between planet frequencies and properties and the metallicity of the hosts. Our results can usefully inform formation, structural, and evolutionary models of gas giant planets.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 11:00:50 GMT" } ]
2009-11-13T00:00:00
[ [ "Sozzetti", "A.", "" ], [ "Torres", "G.", "" ], [ "Latham", "D. W.", "" ], [ "Carney", "B. W.", "" ], [ "Laird", "J. B.", "" ], [ "Stefanik", "R. P.", "" ], [ "Boss", "A. P.", "" ], [ "Charbonneau", "D.", "" ], [ "O'Donovan", "F. T.", "" ], [ "Holman", "M. J.", "" ], [ "Winn", "J. N.", "" ] ]
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711.4902
Mikko Alava
Mikko Alava, John Ardelius, Erik Aurell, Petteri Kaski, Supriya Krishnamurthy, Pekka Orponen, and Sakari Seitz
Circumspect descent prevails in solving random constraint satisfaction problems
6 figures, about 17 pates
null
10.1073/pnas.0712263105
null
cs.DS cond-mat.stat-mech cs.AI
null
We study the performance of stochastic local search algorithms for random instances of the $K$-satisfiability ($K$-SAT) problem. We introduce a new stochastic local search algorithm, ChainSAT, which moves in the energy landscape of a problem instance by {\em never going upwards} in energy. ChainSAT is a \emph{focused} algorithm in the sense that it considers only variables occurring in unsatisfied clauses. We show by extensive numerical investigations that ChainSAT and other focused algorithms solve large $K$-SAT instances almost surely in linear time, up to high clause-to-variable ratios $\alpha$; for example, for K=4 we observe linear-time performance well beyond the recently postulated clustering and condensation transitions in the solution space. The performance of ChainSAT is a surprise given that by design the algorithm gets trapped into the first local energy minimum it encounters, yet no such minima are encountered. We also study the geometry of the solution space as accessed by stochastic local search algorithms.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 11:01:40 GMT" } ]
2009-11-13T00:00:00
[ [ "Alava", "Mikko", "" ], [ "Ardelius", "John", "" ], [ "Aurell", "Erik", "" ], [ "Kaski", "Petteri", "" ], [ "Krishnamurthy", "Supriya", "" ], [ "Orponen", "Pekka", "" ], [ "Seitz", "Sakari", "" ] ]
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711.4903
Alessandro Sozzetti
A. Sozzetti (1,2), S. Casertano (3), M.G. Lattanzi (2), A. Spagna (1), R. Morbidelli (2), R. Pannunzio (2), D. Pourbaix (4), D. Queloz (5) ((1) CfA, (2) OATo, (3) STScI, (4)ULB, (5)Geneva)
Testing Planet Formation Models with Gaia $\mu$as Astrometry
4 pages, 1 figure. To appear in the proceedings of "IAU Symposium 248 - A Giant Step: from Milli- to Micro-arcsecond Astrometry", held in Shanghai, China, 15-19 Oct. 2007
null
10.1017/S1743921308019200
null
astro-ph
null
In this paper, we first summarize the results of a large-scale double-blind tests campaign carried out for the realistic estimation of the Gaia potential in detecting and measuring planetary systems. Then, we put the identified capabilities in context by highlighting the unique contribution that the Gaia exoplanet discoveries will be able to bring to the science of extrasolar planets during the next decade.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 11:10:12 GMT" } ]
2009-11-13T00:00:00
[ [ "Sozzetti", "A.", "" ], [ "Casertano", "S.", "" ], [ "Lattanzi", "M. G.", "" ], [ "Spagna", "A.", "" ], [ "Morbidelli", "R.", "" ], [ "Pannunzio", "R.", "" ], [ "Pourbaix", "D.", "" ], [ "Queloz", "D.", "" ] ]
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711.4904
Miles Gould
Miles Gould
The Categorification of a Symmetric Operad is Independent of Signature
Presented at CT2007, June 2007, in Carvoeiro, Portugal
null
null
null
math.CT
null
Given a symmetric operad $P$, and a signature (or generating sequence) $\Phi$ for $P$, we define a notion of the "categorification" (or "weakening") of $P$ with respect to $\Phi$. When $P$ is the symmetric operad whose algebras are commutative monoids, with the standard signature, we recover the notion of symmetric monoidal categories. We then show that this categorification is independent (up to equivalence) of the choice of signature.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 11:33:57 GMT" } ]
2007-12-03T00:00:00
[ [ "Gould", "Miles", "" ] ]
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711.4905
Oleg Kochukhov
O. Kochukhov
Magnetic fields, spots and weather in chemically peculiar stars
Invited review presented at the CP#Ap Workshop (Vienna, Austria, 2007)
null
null
null
astro-ph
null
New observational techniques and sophisticated modelling methods has led to dramatic breakthroughs in our understanding of the interplay between the surface magnetism, atomic diffusion and atmospheric dynamics in chemically peculiar stars. Magnetic Doppler images, constructed using spectropolarimetric observations of Ap stars in all four Stokes parameters, reveal the presence of small-scale field topologies. Abundance Doppler mapping has been perfected to the level where distributions of many different chemical elements can be deduced self-consistently for one star. The inferred chemical spot structures are diverse and do not always trace underlying magnetic field geometry. Moreover, horizontal chemical inhomogeneities are discovered in non-magnetic CP stars and evolving chemical spots are observed for the first time in the bright mercury-manganese star alpha And. These results show that in addition to magnetic fields, another important non-magnetic structure formation mechanism acts in CP stars.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 11:24:01 GMT" } ]
2007-12-03T00:00:00
[ [ "Kochukhov", "O.", "" ] ]
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711.4906
Jeremy Shears
Jeremy Shears, David Boyd, Steve Brady, Ian Miller, Roger Pickard
Measuring the period of the delta Scuti variable U1425-01208594 in Cassiopeia
Accepted for publication in the Open European Journal on Variable Stars. 4 pages, 4 figures
null
null
null
astro-ph
null
The variability of U1425-01208594 was recently discovered by Schmidtobreick et al, who suggested that it is a member of the delta Scuti family of pulsating stars. Photometry conducted by the authors revealed a period of 0.06695(8) d and a peak-to-peak amplitude of 0.014 mag.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 11:29:59 GMT" } ]
2007-12-03T00:00:00
[ [ "Shears", "Jeremy", "" ], [ "Boyd", "David", "" ], [ "Brady", "Steve", "" ], [ "Miller", "Ian", "" ], [ "Pickard", "Roger", "" ] ]
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711.4907
Oleg Kochukhov
O. Kochukhov, D. Shulyak
New generation model atmospheres for chemically peculiar stars
submitted to Contrib. Astron. Obs. Skalnate Pleso (Proceedings of the CP#Ap Workshop, Vienna, 2007, eds. J. Ziznovsky, J. Zverko, E. Pauntzen, M. Netopil)
null
null
null
astro-ph
null
The atmospheric structure of chemically peculiar stars deviates from that of normal stars with similar fundamental parameters due to unusual chemistry, abundance inhomogeneities and the presence of strong magnetic field. These effects are not considered in the standard model atmospheres, possibly leading to large errors in the stellar parameter determination and abundance analysis. To tackle this problem we used the state-of-the-art opacity sampling model atmosphere code LLmodels to calculate comprehensive grid of new generation model atmospheres for magnetic CP stars. This grid covers the whole parameter space occupied by SrCrEu and Si-peculiar stars, taking into account characteristic temperature dependence of the chemical abundances. Here we present the first results of our model atmosphere calculations.
[ { "version": "v1", "created": "Fri, 30 Nov 2007 11:30:51 GMT" } ]
2007-12-03T00:00:00
[ [ "Kochukhov", "O.", "" ], [ "Shulyak", "D.", "" ] ]
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