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801.4373
Sung-Chul Yoon
S.-C. Yoon, M. Cantiello, and N. Langer
Evolution of massive stars at very low metallicity including rotation and binary interactions
5 pages, 6 figures, To appear in "Proceedings of First Stars III," Eds. Brian W. O'Shea, Alexander Heger & Tom Abel
AIP Conf.Proc.990:225-229,2008
10.1063/1.2905548
null
astro-ph
null
We discuss recent models on the evolution of massive stars at very low metallicity including the effects of rotation, magnetic fields and binarity. Very metal poor stars lose very little mass and angular momentum during the main sequence evolution, and rotation plays a dominant role in their evolution. In rapidly rotating massive stars, the rotationally induced mixing time scale can be even shorter than the nuclear time scale throughout the main sequence. The consequent quasi-chemically homogeneous evolution greatly differs from the standard massive star evolution that leads to formation of red giants with strong chemical stratification. Interesting outcomes of such a new mode of evolution include the formation of rapidly rotating massive Wolf-Rayet stars that emit large amounts of ionizing photons, the formation of a long gamma-ray bursts and a hypernovae, and the production of large amounts of primary nitrogen. We show that binary interactions can further enhance the effects of rotation, as mass accretion in a close binary spins up the secondary.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 20:33:01 GMT" } ]
2009-06-23T00:00:00
[ [ "Yoon", "S. -C.", "" ], [ "Cantiello", "M.", "" ], [ "Langer", "N.", "" ] ]
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801.4374
Oscar Cata
O. Cata (LBNL) and V. Mateu (IFIC)
Novel patterns for vector mesons from the large-Nc limit
7 pages
Phys.Rev.D77:116009,2008
10.1103/PhysRevD.77.116009
null
hep-ph
null
We report on a relation between the decay constants of \rho-like J^{PC}=1^{--} vector mesons, which arises solely from the perturbative analysis of the VV, TT and VT correlators at order \alpha_s^0 in the large-N_c limit. We find f_{V}^T/f_{V}=1/\sqrt{2} for highly excited states together with a pattern of alternation in sign. Quite remarkably, recent lattice determinations reported f_{\rho}^T/f_{\rho}=0.72(2), in excellent agreement with our large-N_c result. This seems to suggest a pattern like f_{Vn}^T/f_{Vn}=(-1)^n/\sqrt{2} for the whole (1^{--}) states. In order to test this conjecture in real QCD we construct a set of spectral sum rules, which turn out to comply nicely with this scenario.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 21:12:53 GMT" } ]
2008-11-26T00:00:00
[ [ "Cata", "O.", "", "LBNL" ], [ "Mateu", "V.", "", "IFIC" ] ]
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801.4375
Karen Gibson
CDF Collaboration: T. Aaltonen et al
Measurement of Ratios of Fragmentation Fractions for Bottom Hadrons in p-pbar Collisions at sqrt{s}=1.96 TeV
Submitted to PRD, 54 pages, 53 plots
Phys.Rev.D77:072003,2008
10.1103/PhysRevD.77.072003
null
hep-ex hep-ph
null
This paper describes the first measurement of b-quark fragmentation fractions into bottom hadrons in Run II of the Tevatron Collider at Fermilab. The result is based on a 360 pb-1 sample of data collected with the CDF II detector in p-pbar collisions at sqrt{s}=1.96 TeV. Semileptonic decays of B0, B+, and B_s mesons, as well as Lambda_b baryons, are reconstructed. For an effective bottom hadron p_T threshold of 7 GeV/c, the fragmentation fractions are measured to be f_u/f_d=1.054 +/- 0.018 (stat) +0.025-0.045(sys) +/- 0.058 (Br), f_s/(f_u+f_d)=0.160 +/- 0.005 (stat) +0.011-0.010 (sys) +0.057-0.034 (Br), and f_{Lambda_b}/(f_u+f_d)=0.281\pm0.012 (stat) +0.058-0.056 (sys) +0.128-0.086 (Br), where the uncertainty (Br) is due to uncertainties on measured branching ratios. The value of f_s/(f_u+f_d) agrees within one standard deviation with previous CDF measurements and the world average of this quantity, which is dominated by LEP measurements. However, the ratio f_{Lambda_b}/(f_u+f_d) is approximately twice the value previously measured at LEP. The approximately 2 sigma discrepancy is examined in terms of kinematic differences between the two production environments.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 22:49:46 GMT" } ]
2010-05-12T00:00:00
[ [ "CDF Collaboration", "", "" ], [ "al", "T. Aaltonen et", "" ] ]
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801.4376
Michael Kachelrie{\ss}
M. Kachelriess
Lecture notes on high energy cosmic rays
82 pages, prepared for the 17th Jyvaskyla Summer School, comments welcome
null
null
null
astro-ph
null
I give a concise introduction into high energy cosmic ray physics, including also few related aspects of high energy gamma-ray and neutrino astrophysics. The main emphasis is placed on astrophysical questions, and the level of the presentation is kept basic.
[ { "version": "v1", "created": "Tue, 29 Jan 2008 16:44:54 GMT" } ]
2008-01-30T00:00:00
[ [ "Kachelriess", "M.", "" ] ]
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801.4377
Stefan Kraus
Stefan Kraus, Thomas Preibisch, Keiichi Ohnaka
Resolving the inner active accretion disk around the Herbig Be star MWC 147 with VLTI/MIDI+AMBER spectro-interferometry
5 pages, 4 figures, Proceedings paper for the ESO workshop "The VLT in the ELT era", Garching, October 2007
null
10.1007/978-1-4020-9190-2_19
null
astro-ph
null
We studied the geometry of the inner (AU-scale) circumstellar environment around the Herbig Be star MWC 147. Combining, for the first time, near- (NIR, K band) and mid-infrared (MIR, N band) spectro-interferometry on a Herbig star, our VLTI/MIDI and AMBER data constrain not only the geometry of the brightness distribution, but also the radial temperature distribution in the disk. For our detailed modeling of the interferometric data and the spectral energy distribution, we employ 2-D radiation transfer simulations, showing that passive irradiated Keplerian dust disks can easily fit the SED, but predict much lower visibilities than observed. Models of a Keplerian disk with emission from an optically thick inner gaseous accretion disk (inside the dust sublimation zone), however, yield a good fit of the SED and simultaneously reproduce the observed NIR and MIR visibilities. We conclude that the NIR continuum emission from MWC 147 is dominated by accretion luminosity emerging from an optically thick inner gaseous disk, while the MIR emission also contains strong contributions from the outer dust disk.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 21:00:48 GMT" } ]
2009-11-13T00:00:00
[ [ "Kraus", "Stefan", "" ], [ "Preibisch", "Thomas", "" ], [ "Ohnaka", "Keiichi", "" ] ]
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801.4378
Dan Hooper
Dan Hooper
Constraining Supersymmetric Dark Matter With Synchrotron Measurements
4 pages, 3 figures
Phys.Rev.D77:123523,2008
10.1103/PhysRevD.77.123523
FERMILAB-PUB-08-019-A
hep-ph astro-ph
null
The annihilations of neutralino dark matter (or other dark matter candidate) generate, among other Standard Model states, electrons and positrons. These particles emit synchrotron photons as a result of their interaction with the Galactic Magnetic Field. In this letter, we use the measurements of the WMAP satellite to constrain the intensity of this synchrotron emission and, in turn, the annihilation cross section of the lightest neutralino. We find this constraint to be more stringent than that provided by any other current indirect detection channel. In particular, the neutralino annihilation cross section must be less than ~ 3 x 10^-26 cm^3/s (1 x 10^25 cm^3/s) for 100 GeV (500 GeV) neutralinos distributed with an NFW halo profile. For the conservative case of an entirely flat dark matter distribution within the inner 8 kiloparsecs of the Milky Way, the constraint is approximately a factor of 30 less stringent. Even in this conservative case, synchrotron measurements strongly constrain, for example, the possibility of wino or higgsino neutralino dark matter produced non-thermally in the early universe.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 21:01:01 GMT" } ]
2008-11-26T00:00:00
[ [ "Hooper", "Dan", "" ] ]
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801.4379
Francesco Shankar
Francesco Shankar, Xinyu Dai, and Gregory R. Sivakoff (The Ohio State University)
Dependence of the BALQSO fraction on Radio Luminosity
replaced with version accepted by ApJ; more complete analysis; basic results unchanged
ApJ 687 (2008) 859-868
10.1086/591488
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We find that the fraction of classical Broad Absorption Line quasars (BALQSOs) among the FIRST radio sources in the Sloan Data Release 3, is 20.5^{+7.3}_{-5.9}% at the faintest radio powers detected (L_{\rm 1.4 GHz}~10^{32} erg/s), and rapidly drops to <8% at L_{\rm 1.4 GHz}~3*10^{33} erg/s. Similarly, adopting the broader Absorption Index (AI) definition of Trump et al. (2006) we find the fraction of radio BALQSOs to be 44^{+8.1}_{-7.8}% reducing to 23.1^{+7.3}_{-6.1}% at high luminosities. While the high fraction at low radio power is consistent with the recent near-IR estimates by Dai et al. (2008), the lower fraction at high radio powers is intriguing and confirms previous claims based on smaller samples. The trend is independent of the redshift range, the optical and radio flux selection limits, or the exact definition of a radio match. We also find that at fixed optical magnitude, the highest bins of radio luminosity are preferentially populated by non-BALQSOs, consistent with the overall trend. We do find, however, that those quasars identified as AI-BALQSOs but \emph{not} under the classical definition, do not show a significant drop in their fraction as a function of radio power, further supporting independent claims for which these sources, characterized by lower equivalent width, may represent an independent class with respect to the classical BALQSOs. We find the balnicity index, a measure of the absorption trough in BALQSOs, and the mean maximum wind velocity to be roughly constant at all radio powers. We discuss several plausible physical models which may explain the observed fast drop in the fraction of the classical BALQSOs with increasing radio power, \emph{although no one is entirely satisfactory}. (abridged).
[ { "version": "v1", "created": "Mon, 28 Jan 2008 22:54:15 GMT" }, { "version": "v2", "created": "Tue, 1 Jul 2008 22:43:39 GMT" } ]
2009-01-15T00:00:00
[ [ "Shankar", "Francesco", "", "The Ohio State\n University" ], [ "Dai", "Xinyu", "", "The Ohio State\n University" ], [ "Sivakoff", "Gregory R.", "", "The Ohio State\n University" ] ]
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801.438
Tommaso Giannantonio
Tommaso Giannantonio (ICG Portsmouth), Ryan Scranton (Pittsburgh), Robert G. Crittenden (ICG Portsmouth), Robert C. Nichol (ICG Portsmouth), Stephen P. Boughn (Haverford), Adam D. Myers (Illinois), Gordon T. Richards (Drexel)
Combined analysis of the integrated Sachs-Wolfe effect and cosmological implications
24 pages, 15 figures. Version accepted by PRD. Improved quasar data, revised parameter constraints
Phys.Rev.D77:123520,2008
10.1103/PhysRevD.77.123520
null
astro-ph
null
We present a global measurement of the integrated Sachs-Wolfe (ISW) effect obtained by cross-correlating all relevant large scale galaxy data sets with the cosmic microwave background radiation map provided by the Wilkinson Microwave Anisotropy Probe. With these measurements, the overall ISW signal is detected at the ~ 4.5 sigma level. We also examine the cosmological implications of these measurements, particularly the dark energy equation of state w, its sound speed, and the overall curvature of the Universe. The flat LCDM model is a good fit to the data and, assuming this model, we find that the ISW data constrain Omega_m = 0.20 +0.19 -0.11 at the 95% confidence level. When we combine our ISW results with the latest baryon oscillation and supernovae measurements, we find that the result is still consistent with a flat LCDM model with w = -1 out to redshifts z > 1.
[ { "version": "v1", "created": "Tue, 29 Jan 2008 17:38:38 GMT" }, { "version": "v2", "created": "Tue, 6 May 2008 16:40:08 GMT" } ]
2008-11-26T00:00:00
[ [ "Giannantonio", "Tommaso", "", "ICG Portsmouth" ], [ "Scranton", "Ryan", "", "Pittsburgh" ], [ "Crittenden", "Robert G.", "", "ICG Portsmouth" ], [ "Nichol", "Robert C.", "", "ICG Portsmouth" ], [ "Boughn", "Stephen P.", "", "Haverford" ], [ "Myers", "Adam D.", "", "Illinois" ], [ "Richards", "Gordon T.", "", "Drexel" ] ]
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801.4381
Panayiotis Tzanavaris
P. Tzanavaris (1,2,3), I. Georgantopoulos (1) ((1)National Observatory of Athens, Greece, (2)NASA/Goddard Space Flight Center, (3)The Johns Hopkins University)
The galaxy luminosity function and its evolution with Chandra
Accepted for publication in A&A
null
10.1051/0004-6361:20078193
null
astro-ph
null
AIMS: We have compiled one of the largest normal-galaxy samples ever to probe X-ray luminosity function evolution separately for early and late-type systems. METHODS: We selected 207 normal galaxies up to redshift z~1.4, with data from four major Chandra X-ray surveys, namely the Chandra deep fields (north, south and extended) and XBootes, and a combination of X-ray and optical criteria. We used template spectral energy-distribution fitting to obtain separate early- and late-type sub-samples, made up of 101 and 106 systems, respectively. For the full sample, as well as the two sub-samples, we obtained luminosity functions using both a non-parametric and a parametric, maximum-likelihood method. RESULTS: For the full sample, the non-parametric method strongly suggests luminosity evolution with redshift. The maximum-likelihood estimate shows that this evolution follows ~(1+z)^k_total, k_total=2.2+-0.3. For the late-type sub-sample, we obtained k_late=2.4^+1.0_-2.0. We detected no significant evolution in the early-type sub-sample. The distributions of early and late-type systems with redshift show that late types dominate at z>~0.5 and hence drive the observed evolution for the total sample. CONCLUSIONS: Our results support previous results in X-ray and other wavebands, which suggests luminosity evolution with k=2-3.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 21:26:35 GMT" } ]
2009-11-13T00:00:00
[ [ "Tzanavaris", "P.", "" ], [ "Georgantopoulos", "I.", "" ] ]
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801.4382
Himel Ghosh
Himel Ghosh (1), Smita Mathur (1), Fabrizio Fiore (2), Laura Ferrarese (3) ((1) Ohio State University, (2) INAF - Osservatorio Astronomico di Roma, (3) Herzberg Institute of Astrophysics)
Low-Level Nuclear Activity in Nearby Spiral Galaxies
37 pages, 10 figures, ApJ, in press. Replaced with accepted version
null
10.1086/591508
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We are conducting a search for supermassive black holes (SMBHs) with masses below 10^7 M_sun by looking for signs of extremely low-level nuclear activity in nearby galaxies that are not known to be AGNs. Our survey has the following characteristics: (a) X-ray selection using the Chandra X-ray Observatory, since x-rays are a ubiquitous feature of AGNs; (b) Emphasis on late-type spiral and dwarf galaxies, as the galaxies most likely to have low-mass SMBHs; (c) Use of multiwavelength data to verify the source is an AGN; and (d) Use of the highest angular resolution available for observations in x-rays and other bands, to separate nuclear from off-nuclear sources and to minimize contamination by host galaxy light. Here we show the feasibility of this technique to find AGNs by applying it to six nearby, face-on spiral galaxies (NGC 3169, NGC 3184, NGC 4102, NGC 4647, NGC 4713, NGC 5457) for which data already exist in the Chandra archive. All six show nuclear x-ray sources. The data as they exist at present are ambiguous regarding the nature of the nuclear x-ray sources in NGC 4713 and NGC 4647. We conclude, in accord with previous studies, that NGC 3169 and NGC 4102 are almost certainly AGNs. Most interestingly, a strong argument can be made that NGC 3184 and NGC 5457, both of type Scd, host AGNs.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 21:05:49 GMT" }, { "version": "v2", "created": "Tue, 24 Jun 2008 20:12:02 GMT" } ]
2009-11-13T00:00:00
[ [ "Ghosh", "Himel", "" ], [ "Mathur", "Smita", "" ], [ "Fiore", "Fabrizio", "" ], [ "Ferrarese", "Laura", "" ] ]
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801.4383
Brian Batell
Brian Batell, Tony Gherghetta
Dynamical Soft-Wall AdS/QCD
9 pages; v2: references added, minor corrections
Phys.Rev.D78:026002,2008
10.1103/PhysRevD.78.026002
null
hep-ph hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a solution of the five-dimensional gravity-dilaton-tachyon equations of motion with a pure AdS_5 metric and a quadratic dilaton and linear tachyon in conformal coordinates. This leads to an infrared soft wall model where the dilaton profile gives rise to linear Regge trajectories for the four-dimensional mass spectrum of the dual gauge theory. Even though our approach is phenomenological the scalar fields resemble the dilaton and the closed string tachyon of a non-critical string theory. Interestingly, the linear tachyon has the correct profile to imply that chiral symmetry is not restored for highly excited states. Our solution thus provides a dynamical bottom-up model of linear confinement in holographic QCD.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 23:01:48 GMT" }, { "version": "v2", "created": "Wed, 23 Jul 2008 13:54:59 GMT" } ]
2008-11-26T00:00:00
[ [ "Batell", "Brian", "" ], [ "Gherghetta", "Tony", "" ] ]
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801.4384
Patrick De Leenheer
Patrick De Leenheer
Within-host HIV models with periodic antiretroviral therapy
13 pages, 9 figures
null
null
null
q-bio.OT
null
This paper investigates the effect of drug treatment on the standard within-host HIV model, assuming that therapy occurs periodically. It is shown that eradication is possible under these periodic regimes, and we quantitatively characterize successful drugs or drug combinations, both theoretically and numerically. We also consider certain optimization problems, motivated for instance, by the fact that eradication should be achieved at acceptable toxicity levels to the patient. It turns out that these optimization problems can be simplified considerably, and this makes calculations of the optima a fairly straightforward task. All our results will be illustrated by means of numerical examples based on up-to-date knowledge of parameter values in the model.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 21:12:08 GMT" } ]
2008-01-30T00:00:00
[ [ "De Leenheer", "Patrick", "" ] ]
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801.4385
Samuela Pasquali
S. Pasquali, A. C. Maggs
Numerical studies of Casimir interactions
4 pages, 5 figures
null
null
null
quant-ph cond-mat.stat-mech
null
We study numerically the Casimir interaction between dielectrics in both two and three dimensions. We demonstrate how sparse matrix factorizations enable one to study torsional interactions in three dimensions. In two dimensions we study the full cross-over between non-retarded and retarded interactions as a function of separation. We use constrained factorizations in order to measure the interaction of a particle with a rough dielectric surface and compare with a scaling argument.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 21:18:59 GMT" } ]
2008-02-05T00:00:00
[ [ "Pasquali", "S.", "" ], [ "Maggs", "A. C.", "" ] ]
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801.4386
Panayiotis Tzanavaris
I. Georgantopoulos (1), P. Tzanavaris (1,2,3) ((1) National Observatory of Athens, Greece, (2) NASA/Goddard Space Flight Center, (3) The Johns Hopkins University)
The X-ray luminosity function of galaxies and its evolution
Accepted to be published as an MPE report for the conference "X-rays from nearby galaxies" (ESAC, Spain, September 5-7, 2007); S. Carpano (ed.)
null
null
null
astro-ph
null
We compile one of the largest ever samples to probe the X-ray normal galaxy luminosity function and its evolution with cosmic time. In particular, we select 207 galaxies (106 late and 101 early-type systems) from the Chandra Deep Field North and South surveys, the Extended Chandra Deep Field South and the XBOOTES survey. We derive the luminosity function separately for the total (early+late), the early and the late-type samples using both a parametric maximum likelihood method, and a variant of the non-parametric 1/V_m method. Although the statistics is limited, we find that the total (early+late) galaxy sample is consistent with a Pure Luminosity evolution model where the luminosity evolves according to L(z) ~ (1+z)^2.2. The late-type systems appear to drive this trend while the early-type systems show much weaker evidence for evolution. We argue that the X-ray evolution of late-type systems is consistent with that of blue galaxies in the optical. In contrast there is a mismatch between the X-ray evolution of early-type systems and that of red galaxies at optical wavelengths.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 21:29:19 GMT" } ]
2008-01-30T00:00:00
[ [ "Georgantopoulos", "I.", "" ], [ "Tzanavaris", "P.", "" ] ]
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801.4387
Luis Lehner
Matthew Anderson, Eric W. Hirschmann, Luis Lehner, Steven L. Liebling, Patrick M. Motl, David Neilsen, Carlos Palenzuela, Joel E. Tohline
Magnetized Neutron Star Mergers and Gravitational Wave Signals
Replaced with accepted PRL version. (Figures have been reduced in quality)
Phys.Rev.Lett.100:191101,2008
10.1103/PhysRevLett.100.191101
null
gr-qc astro-ph physics.comp-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We investigate the influence of magnetic fields upon the dynamics of and resulting gravitational waves from a binary neutron star merger in full general relativity coupled to ideal magnetohydrodynamics (MHD). We consider two merger scenarios, one where the stars begin with initially aligned poloidal magnetic fields and one with no magnetic field. Both mergers result in a strongly differentially rotating object. In comparison to the non-magnetized scenario, the aligned magnetic fields delay the final merger of the two stars. During and after merger we observe phenomena driven by the magnetic field, including Kelvin-Helmholtz instabilities in shear layers, winding of the field lines, and transition from poloidal to toroidal fields. These effects not only produce electromagnetic radiation, but also can have a strong influence on the gravitational waves. Thus, there are promising prospects for studying such systems with both types of waves.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 22:14:51 GMT" }, { "version": "v2", "created": "Mon, 9 Jun 2008 23:24:47 GMT" } ]
2008-11-26T00:00:00
[ [ "Anderson", "Matthew", "" ], [ "Hirschmann", "Eric W.", "" ], [ "Lehner", "Luis", "" ], [ "Liebling", "Steven L.", "" ], [ "Motl", "Patrick M.", "" ], [ "Neilsen", "David", "" ], [ "Palenzuela", "Carlos", "" ], [ "Tohline", "Joel E.", "" ] ]
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801.4388
Arunav Kundu
Arunav Kundu, Stephen E. Zepf, Thomas J. Maccarone
The Low Mass X-ray Binary - Globular Cluster Link and its Implications
To be be published in the proceedings of, "A Population Explosion: The Nature and Evolution of X-ray Binaries in Diverse Environments", eds. Bandyopadhyay et al
AIP Conf.Proc.1010:313-319,2008
10.1063/1.2945065
null
astro-ph
null
Studies of nearby elliptical and S0 galaxies reveal that roughly half of the low mass X-ray binaries (LMXBs), which are luminous tracers of accreting neutron star or black hole systems, are in clusters. There is a surprising tendency of LMXBs to be preferentially associated with metal-rich globular clusters (GCs), with metal-rich GCs hosting three times as many LMXBs as metal-poor ones. There is no convincing evidence of a correlation with GC age so far. In some galaxies the LMXB formation rate varies with GC color even within the metal-rich peak of the typical bimodal cluster metallicity distribution. This provides some of the strongest evidence to date that there are metallicity variations within the metal-rich GC peak, as is expected in hierarchical galaxy formation scenarios. We also note that apparent correlations between the interaction rates in GCs and LMXB frequency may not be reliable because of the uncertainties in some GC parameters. We argue in fact that there are considerable uncertainties in the integrated properties of even the Milky Way clusters that are often overlooked.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 21:30:20 GMT" } ]
2009-06-23T00:00:00
[ [ "Kundu", "Arunav", "" ], [ "Zepf", "Stephen E.", "" ], [ "Maccarone", "Thomas J.", "" ] ]
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801.4389
Frank J. Petriello
Frank Petriello, Seth Quackenbush
Measuring Z' couplings at the LHC
22 pgs., 6 figs; refs and discussion added
Phys.Rev.D77:115004,2008
10.1103/PhysRevD.77.115004
null
hep-ph
null
We study the properties of potential new Z' gauge bosons produced through the Drell-Yan mechanism at the LHC. Our analysis is performed using a fully differential next-to-leading order QCD calculation with spin correlations, interference effects, and experimental acceptances included. We examine the distinguishability of different models and the feasibility of extracting general coupling information with statistical, residual scale, and current parton distribution function error estimates included. We extend a previous parametrization of Z' couplings to include parity-violating coupling combinations, and introduce a convenient technique for simulating new gauge bosons on-peak using the concept of basis models. We illustrate our procedure using several example Z' models. We find that one can extract reliably four combinations of generation-independent quark and lepton couplings in our analysis. For a Z' mass of 1.5 TeV, one can determine coupling information very well assuming 100 fb^{-1} of integrated luminosity, and a precise measurement becomes possible with 1 ab^{-1} at the SLHC. For a 3 TeV mass, a reasonable determination requires the SLHC.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 22:07:12 GMT" }, { "version": "v2", "created": "Fri, 11 Apr 2008 21:14:46 GMT" } ]
2008-11-26T00:00:00
[ [ "Petriello", "Frank", "" ], [ "Quackenbush", "Seth", "" ] ]
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801.439
Ken-Ichi Nishikawa
K.-I. Nishikawa (NSSTC/Uah), Y. Mizuno (NASA/MSFC/NSSTC), G. J. Fishman (NASA/MSFC), P. Hardee (UA)
Particle Acceleration, Magnetic Field Generation, and Associated Emission in Collisionless Relativistic Jets
4 pages, 3 figures, contributed talk at the workshop: High Energy Phenomena in Relativistic Outflows (HEPRO), Dublin, 24-28 September 2007. Fig. 3 is replaced by the correct version
Int.J.Mod.Phys.D17:1761-1767,2008
10.1142/S0218271808013388
null
astro-ph
null
Nonthermal radiation observed from astrophysical systems containing relativistic jets and shocks, e.g., active galactic nuclei (AGNs), gamma-ray bursts (GRBs), and Galactic microquasar systems usually have power-law emission spectra. Recent PIC simulations using injected relativistic electron-ion (electro-positron) jets show that acceleration occurs within the downstream jet. Shock acceleration is a ubiquitous phenomenon in astrophysical plasmas. Plasma waves and their associated instabilities (e.g., the Buneman instability, other two-streaming instability, and the Weibel instability) created in the shocks are responsible for particle (electron, positron, and ion) acceleration. The simulation results show that the Weibel instability is responsible for generating and amplifying highly nonuniform, small-scale magnetic fields. These magnetic fields contribute to the electron's transverse deflection behind the jet head. The ``jitter'' radiation from deflected electrons has different properties than synchrotron radiation which assumes a uniform magnetic field. This jitter radiation may be important to understanding the complex time evolution and/or spectral structure in gamma-ray bursts, relativistic jets, and supernova remnants.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 22:08:57 GMT" }, { "version": "v2", "created": "Wed, 13 Feb 2008 16:53:48 GMT" } ]
2009-06-23T00:00:00
[ [ "Nishikawa", "K. -I.", "", "NSSTC/Uah" ], [ "Mizuno", "Y.", "", "NASA/MSFC/NSSTC" ], [ "Fishman", "G. J.", "", "NASA/MSFC" ], [ "Hardee", "P.", "", "UA" ] ]
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801.4391
Zohar Nussinov
Zohar Nussinov, Gerardo Ortiz
Orbital order driven quantum criticality
6 pages, 1 figure (to appear in Europhysics Letters)
null
10.1209/0295-5075/84/36005
null
cond-mat.str-el cond-mat.stat-mech
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Charge, spin, and orbital degrees of freedom underlie the physics of transition metal compounds. Much work has revealed quantum critical points associated with spin and charge degrees of freedom in many of these systems. Here we illustrate that the simplest models that embody the orbital degrees of freedom - the two- and three-dimensional quantum orbital compass models - exhibit an exact quantum critical behavior on diluted square and cubic lattices (with a doping fraction of 1/4 and 1/2 respectively). This raises the possibility of quantum critical points triggered by the degradation of orbital order upon doping (or applying pressure to) such transition metal systems. We prove the existence of an orbital spin glass in several related systems in which the orbital couplings are made non-uniform. Moreover, a new orbital Larmor precession (i.e., a periodic change in the orbital state) is predicted when uniaxial pressure is applied.
[ { "version": "v1", "created": "Tue, 29 Jan 2008 20:46:48 GMT" }, { "version": "v2", "created": "Wed, 15 Oct 2008 16:34:10 GMT" } ]
2009-11-13T00:00:00
[ [ "Nussinov", "Zohar", "" ], [ "Ortiz", "Gerardo", "" ] ]
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801.4392
Qing Xiang
David B. Chandler, Peter Sin, Qing Xiang
Incidence Modules for Symplectic Spaces in Characteristic Two
null
null
null
null
math.CO math.RT
null
We study the permutation action of a finite symplectic group of characteristic 2 on the set of subspaces of its standard module which are either totally isotropic or else complementary to totally isotropic subspaces with respect to the alternating form. A general formula is obtained for the 2-rank of the incidence matrix for the inclusion of one-dimensional subspaces in the distinguished subspaces of a fixed dimension.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 22:15:45 GMT" } ]
2008-01-30T00:00:00
[ [ "Chandler", "David B.", "" ], [ "Sin", "Peter", "" ], [ "Xiang", "Qing", "" ] ]
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801.4393
Harm Derksen
Harm Derksen
Symmetric and Quasi-Symmetric Functions associated to Polymatroids
37 pages
null
null
null
math.CO math.AC
null
To every subspace arrangement X we will associate symmetric functions P[X] and H[X]. These symmetric functions encode the Hilbert series and the minimal projective resolution of the product ideal associated to the subspace arrangement. They can be defined for discrete polymatroids as well. The invariant H[X] specializes to the Tutte polynomial T[X]. Billera, Jia and Reiner recently introduced a quasi-symmetric function F[X] (for matroids) which behaves valuatively with respect to matroid base polytope decompositions. We will define a quasi-symmetric function G[X] for polymatroids which has this property as well. Moreover, G[X] specializes to P[X], H[X], T[X] and F[X].
[ { "version": "v1", "created": "Mon, 28 Jan 2008 22:30:48 GMT" } ]
2008-01-30T00:00:00
[ [ "Derksen", "Harm", "" ] ]
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801.4394
Tobias Reichenbach
Tobias Reichenbach, Thomas Franosch, and Erwin Frey
Domain wall delocalization, dynamics and fluctuations in an exclusion process with two internal states
10 pages, 5 figures
Eur. Phys. J. E 27, 47-56 (2008)
10.1140/epje/i2008-10350-3
LMU-ASC 06/08
cond-mat.stat-mech q-bio.SC
null
We investigate the delocalization transition appearing in an exclusion process with two internal states resp. on two parallel lanes. At the transition, delocalized domain walls form in the density profiles of both internal states, in agreement with a mean-field approach. Remarkably, the topology of the system's phase diagram allows for the delocalization of a (localized) domain wall when approaching the transition. We quantify the domain wall's delocalization close to the transition by analytic results obtained within the framework of the domain wall picture. Power-law dependences of the domain wall width on the distance to the delocalization transition as well as on the system size are uncovered, they agree with numerical results.
[ { "version": "v1", "created": "Tue, 29 Jan 2008 18:40:56 GMT" } ]
2008-08-31T00:00:00
[ [ "Reichenbach", "Tobias", "" ], [ "Franosch", "Thomas", "" ], [ "Frey", "Erwin", "" ] ]
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801.4395
Baruch Vainas
Baruch Vainas
Transition from 12 to near-24 hours glucose circadian rhythm on relaxation of a hyperglycemic condition
10 pages, 3 figures
null
null
null
q-bio.QM
null
A composite, exponential relaxation function, modulated by a periodic component, was used to fit to an experimental time series of blood glucose levels. The 11 parameters function that allows for the detection of a possible rhythm transition was fitted to the experimental time series using a genetic algorithm. It has been found that the relaxation from a hyperglycemic condition following a change in the anti-diabetic treatment, can be characterized by a change from an initial 12 hours ultradian rhythm to a near-24 hours circadian rhythm.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 22:27:12 GMT" } ]
2008-01-30T00:00:00
[ [ "Vainas", "Baruch", "" ] ]
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801.4396
Serge Tabachnikov
M. Levi, S. Tabachnikov
On bicycle tire tracks geometry, hatchet planimeter, Menzin's conjecture and oscillation of unicycle tracks
null
null
null
null
math.DG
null
The model of a bicycle is a unit segment AB that can move in the plane so that it remains tangent to the trajectory of point A (the rear wheel is fixed on the bicycle frame); the same model describes the hatchet planimeter. The trajectory of the front wheel and the initial position of the bicycle uniquely determine its motion and its terminal position; the monodromy map sending the initial position to the terminal one arises. According to R. Foote's theorem, this mapping of a circle to a circle is a Moebius transformation. We extend this result to multi-dimensional setting. Moebius transformations belong to one of the three types: elliptic, parabolic and hyperbolic. We prove a 100 years old Menzin's conjecture: if the front wheel track is an oval with area at least pi then the respective monodromy is hyperbolic. We also study bicycle motions introduced by D. Finn in which the rear wheel follows the track of the front wheel. Such a ''unicycle" track becomes more and more oscillatory in forward direction. We prove that it cannot be infinitely extended backward and relate the problem to the geometry of the space of forward semi-infinite equilateral linkages.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 22:57:38 GMT" } ]
2008-01-30T00:00:00
[ [ "Levi", "M.", "" ], [ "Tabachnikov", "S.", "" ] ]
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801.4397
Ovidiu Patu
Ovidiu I. Patu, Vladimir E. Korepin, Dmitri V. Averin
One-Dimensional Impenetrable Anyons in Thermal Equilibrium. I. Anyonic Generalization of Lenard's Formula
13 pages, RevTeX 4
J. Phys. A: Math. Theor. 41 (2008) 145006
10.1088/1751-8113/41/14/145006
null
cond-mat.stat-mech math-ph math.MP quant-ph
null
We have obtained an expansion of the reduced density matrices (or, equivalently, correlation functions of the fields) of impenetrable one-dimensional anyons in terms of the reduced density matrices of fermions using the mapping between anyon and fermion wavefunctions. This is the generalization to anyonic statistics of the result obtained by A. Lenard for bosons. In the case of impenetrable but otherwise free anyons with statistical parameter $\kappa$, the anyonic reduced density matrices in the grand canonical ensemble is expressed as Fredholm minors of the integral operator ($1-\gamma \hat \theta_T$) with complex statistics-dependent coefficient $\gamma=(1+e^{\pm i\pi\kappa})/ \pi$. For $\kappa=0$ we recover the bosonic case of Lenard $\gamma=2/\pi$. Due to nonconservation of parity, the anyonic field correlators $\la \fad(x')\fa(x)\ra$ are different depending on the sign of $x'-x$.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 23:08:06 GMT" }, { "version": "v2", "created": "Wed, 30 Apr 2008 21:08:32 GMT" } ]
2009-11-13T00:00:00
[ [ "Patu", "Ovidiu I.", "" ], [ "Korepin", "Vladimir E.", "" ], [ "Averin", "Dmitri V.", "" ] ]
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801.4398
Elena Poletaeva
Elena Poletaeva
Matrix realizations of exceptional superconformal algebras
17 pages, LaTeX, to be published in the Journal of Geometry and Physics
null
10.1016/j.geomphys.2008.01.005
null
math-ph math.MP
null
We give a general construction of realizations of the contact superconformal algebras $K(2)$ and $\hat{K}'(4)$, and the exceptional superconformal algebra $CK_6$ as subsuperalgebras of matrices over a Weyl algebra of size $2^N\times 2^N$, where $N = 1, 2$ and $3$. We show that there is no such a realization for $K(2N)$, if $N\geq 4$.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 23:16:07 GMT" } ]
2009-11-13T00:00:00
[ [ "Poletaeva", "Elena", "" ] ]
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801.4399
Tomasz Radozycki
Tomasz Radozycki
Instantons and the infrared behavior of the fermion propagator in the Schwinger Model
9 pages, in REVTEX
Eur.Phys.J.C55:509-516,2008
10.1140/epjc/s10052-008-0622-6
null
hep-th
null
Fermion propagator of the Schwinger Model is revisited from the point of view of its infrared behavior. The values of anomalous dimensions are found in arbitrary covariant gauge and in all contributing instanton sectors. In the case of a gauge invariant, but path dependent propagator, the exponential dependence, instead of power law one, is established for the special case when the path is a straight line. The leading behavior is almost identical in any sector, differing only by the slowly varying, algebraic prefactors. The other kind of the gauge invariant function, which is the amplitude of the dressed Dirac fermions, may be reduced, by the appropriate choice of the dressing, to the gauge variant one, if Landau gauge is imposed.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 23:23:48 GMT" }, { "version": "v2", "created": "Tue, 29 Jan 2008 22:35:22 GMT" } ]
2008-11-26T00:00:00
[ [ "Radozycki", "Tomasz", "" ] ]
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801.44
Alain Rouault
Fabrice Gamboa, Alain Rouault
Canonical moments and random spectral measures
32 pages. Revised version accepted for publication in Journal of Theoretical Probability
null
10.1007/s10959-009-0239-1
null
math.PR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study some connections between the random moment problem and the random matrix theory. A uniform draw in a space of moments can be lifted into the spectral probability measure of the pair (A,e) where A is a random matrix from a classical ensemble and e is a fixed unit vector. This random measure is a weighted sampling among the eigenvalues of A. We also study the large deviations properties of this random measure when the dimension of the matrix grows. The rate function for these large deviations involves the reversed Kullback information.
[ { "version": "v1", "created": "Tue, 29 Jan 2008 16:21:35 GMT" }, { "version": "v2", "created": "Thu, 2 Oct 2008 17:01:20 GMT" }, { "version": "v3", "created": "Tue, 7 Jul 2009 09:15:16 GMT" } ]
2009-09-29T00:00:00
[ [ "Gamboa", "Fabrice", "" ], [ "Rouault", "Alain", "" ] ]
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801.4401
Francisco Lobo
Francisco S. N. Lobo
General class of wormhole geometries in conformal Weyl gravity
7 pages, Revtex4. V2: typos corrected. V3: 8 pages, section on the energy conditions added, version to appear in Class. Quant. Gravity
Class.Quant.Grav.25:175006,2008
10.1088/0264-9381/25/17/175006
null
gr-qc astro-ph hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this work, a general class of wormhole geometries in conformal Weyl gravity is analyzed. A wide variety of exact solutions of asymptotically flat spacetimes is found, in which the stress energy tensor profile differs radically from its general relativistic counterpart. In particular, a class of geometries is constructed that satisfies the energy conditions in the throat neighborhood, which is in clear contrast to the general relativistic solutions.
[ { "version": "v1", "created": "Tue, 29 Jan 2008 12:43:51 GMT" }, { "version": "v2", "created": "Thu, 14 Feb 2008 14:25:59 GMT" }, { "version": "v3", "created": "Fri, 4 Jul 2008 16:00:40 GMT" } ]
2008-11-26T00:00:00
[ [ "Lobo", "Francisco S. N.", "" ] ]
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801.4402
Viswanath Ramakrishna
Yassmin Ansari and Viswanath Ramakrishna
On a Quaternionic Representation for Sp(4, R)
21 pages;
null
null
null
math-ph math.MP
null
This work provides a quaternioinc reprsentation for real symplectic matrices in dimension four, analogous to the pair of unit quaternions representation for special orthogonal matrices. In the process of finding formulae for this representation in terms of the entries of the symplectic matrix being thereby represented, it shows how to compute the polar decomposition of a symplectic matrix without any need for spectral calculation. The technique just requires the solution of a simple 2x2 linear system. The work also characterizes symplectic, positive definite matrices in dimension four, and thus can be used in applications where the non-compact part of the symplectic group in dimension four is of utility.
[ { "version": "v1", "created": "Mon, 28 Jan 2008 23:37:47 GMT" } ]
2008-01-30T00:00:00
[ [ "Ansari", "Yassmin", "" ], [ "Ramakrishna", "Viswanath", "" ] ]
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801.4403
Lucas Cieza
Lucas Cieza, William D. Cochran, and Jean-Charles Augereau
Spitzer observations of the Hyades: Circumstellar debris disks at 625 Myr of age
33 pages, 11 figures, accepted by ApJ
null
10.1086/586887
null
astro-ph
null
We use the Spitzer Space Telescope to search for infrared excess at 24, 70, and 160 micron due to debris disks around a sample of 45 FGK-type members of the Hyades cluster. We supplement our observations with archival 24 and 70 micron Spitzer data of an additional 22 FGK-type and 11 A-type Hyades members in order to provide robust statistics on the incidence of debris disks at 625 Myr of age an era corresponding to the late heavy bombardment in the Solar System. We find that none of the 67 FGK-type stars in our sample show evidence for a debris disk, while 2 out of the 11 A-type stars do so. This difference in debris disk detection rate is likely to be due to a sensitivity bias in favor of early-type stars. The fractional disk luminosity, L_dust/L*, of the disks around the two A-type stars is ~4.0E-5, a level that is below the sensitivity of our observations toward the FGK-type stars. However, our sensitivity limits for FGK-type stars are able to exclude, at the 2-sigma level, frequencies higher than 12% and 5% of disks with L_dust/L* > 1.0E-4 and L_dust/L* > 5.0E-4, respectively. We also use our sensitivity limits and debris disk models to constrain the maximum mass of dust, as a function of distance from the stars, that could remain undetected around our targets.
[ { "version": "v1", "created": "Tue, 29 Jan 2008 00:08:31 GMT" }, { "version": "v2", "created": "Wed, 30 Jan 2008 04:13:58 GMT" } ]
2009-11-13T00:00:00
[ [ "Cieza", "Lucas", "" ], [ "Cochran", "William D.", "" ], [ "Augereau", "Jean-Charles", "" ] ]
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801.4404
Nicolas Thi\'ery M.
Maurice Pouzet and Nicolas M. Thi\'ery
Some relational structures with polynomial growth and their associated algebras II: Finite generation
27 pages; submitted
null
null
null
math.CO math.AC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The profile of a relational structure $R$ is the function $\varphi_R$ which counts for every integer $n$ the number, possibly infinite, $\varphi_R(n)$ of substructures of $R$ induced on the $n$-element subsets, isomorphic substructures being identified. If $\varphi_R$ takes only finite values, this is the Hilbert function of a graded algebra associated with $R$, the age algebra $A(R)$, introduced by P.~J.~Cameron. In a previous paper, we studied the relationship between the properties of a relational structure and those of their algebra, particularly when the relational structure $R$ admits a finite monomorphic decomposition. This setting still encompasses well-studied graded commutative algebras like invariant rings of finite permutation groups, or the rings of quasi-symmetric polynomials. In this paper, we investigate how far the well know algebraic properties of those rings extend to age algebras. The main result is a combinatorial characterization of when the age algebra is finitely generated. In the special case of tournaments, we show that the age algebra is finitely generated if and only if the profile is bounded. We explore the Cohen-Macaulay property in the special case of invariants of permutation groupoids. Finally, we exhibit sufficient conditions on the relational structure that make naturally the age algebra into a Hopf algebra.
[ { "version": "v1", "created": "Tue, 29 Jan 2008 00:08:24 GMT" }, { "version": "v2", "created": "Sun, 15 Apr 2018 06:45:27 GMT" } ]
2018-04-17T00:00:00
[ [ "Pouzet", "Maurice", "" ], [ "Thiéry", "Nicolas M.", "" ] ]
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801.4405
David Charlton
David Charlton, Erik D. Demaine, Martin L. Demaine, Gregory Price, Yaa-Lirng Tu
A Locked Orthogonal Tree
null
null
null
null
cs.CG
null
We give a counterexample to a conjecture of Poon [Poo06] that any orthogonal tree in two dimensions can always be flattened by a continuous motion that preserves edge lengths and avoids self-intersection. We show our example is locked by extending results on strongly locked self-touching linkages due to Connelly, Demaine and Rote [CDR02] to allow zero-length edges as defined in [ADG07], which may be of independent interest. Our results also yield a locked tree with only eleven edges, which is the smallest known example of a locked tree.
[ { "version": "v1", "created": "Tue, 29 Jan 2008 00:39:37 GMT" } ]
2008-01-30T00:00:00
[ [ "Charlton", "David", "" ], [ "Demaine", "Erik D.", "" ], [ "Demaine", "Martin L.", "" ], [ "Price", "Gregory", "" ], [ "Tu", "Yaa-Lirng", "" ] ]
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801.4406
Rishi Khatri
Rishi Khatri, Benjamin D. Wandelt
Cosmic (super)string constraints from 21 cm radiation
Accepted for publication in PRL
Phys.Rev.Lett.100:091302, 2008
10.1103/PhysRevLett.100.091302
null
astro-ph
null
We calculate the contribution of cosmic strings arising from a phase transition in the early universe, or cosmic superstrings arising from brane inflation, to the cosmic 21 cm power spectrum at redshifts z > 30. Future experiments can exploit this effect to constrain the cosmic string tension Gu and probe virtually the entire brane inflation model space allowed by current observations. Although current experiments with a collecting area of ~ 1 km^2 will not provide any useful constraints, future experiments with a collecting area of 10^4-10^6 km^2 covering the cleanest 10% of the sky can in principle constrain cosmic strings with tension Gu > 10^(-10) to 10^(-12) (superstring/phase transition mass scale >10^13 GeV).
[ { "version": "v1", "created": "Tue, 29 Jan 2008 02:24:15 GMT" } ]
2011-07-19T00:00:00
[ [ "Khatri", "Rishi", "" ], [ "Wandelt", "Benjamin D.", "" ] ]
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801.4407
Raza Syed M
Erica Walker and Raza M. Syed
Tiger Tales: A Critical Examination of the Tiger's Enclosure at the San Francisco Zoo
4 pages, 1 figure
null
null
null
physics.soc-ph physics.ed-ph
null
Given the recent tragedy involving a 350 pound Siberian Tiger and the death of teenager Carlos Souza Jr., one must ask a fundamental question: Can a tiger overcome an obstacle that is thirty-three feet away and twelve and a half feet tall? Are these dimensions sufficient enough to protect the zoo-visitors from a potential escape and/or attack? To answer these questions we use simple two-dimensional projectile motion to find the minimum velocity a tiger needs in order to clear the obstacle. With our results we conclude that it is highly likely that the tiger was able to leap over the obstacle with ease!
[ { "version": "v1", "created": "Tue, 29 Jan 2008 01:11:59 GMT" } ]
2008-01-30T00:00:00
[ [ "Walker", "Erica", "" ], [ "Syed", "Raza M.", "" ] ]
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801.4408
Brendon Brewer
Brendon J. Brewer
Getting Your Eye In: A Bayesian Analysis of Early Dismissals in Cricket
Submitted. Latest version includes more quantitative results. Software available from http://web.maths.unsw.edu.au/~brewer/
null
null
null
stat.AP physics.data-an
null
A Bayesian Survival Analysis method is motivated and developed for analysing sequences of scores made by a batsman in test or first class cricket. In particular, we expect the presence of an effect whereby the distribution of scores has more probability near zero than a geometric distribution, due to the fact that batting is more difficult when the batsman is new at the crease. A Metropolis-Hastings algorithm is found to be efficient at estimating the proposed parameters, allowing us to quantify exactly how large this early-innings effect is, and how long a batsman needs to be at the crease in order to ``get their eye in''. Applying this model to several modern players shows that a batsman is typically only playing at about half of their potential ability when they first arrive at the crease, and gets their eye in surprisingly quickly. Additionally, some players are more ``robust'' (have a smaller early-innings effect) than others, which may have implications for selection policy.
[ { "version": "v1", "created": "Tue, 29 Jan 2008 01:12:58 GMT" }, { "version": "v2", "created": "Mon, 26 May 2008 06:30:54 GMT" } ]
2008-05-26T00:00:00
[ [ "Brewer", "Brendon J.", "" ] ]
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801.4409
Li-Gang Wang
Li-Gang Wang
The equivalent medium theory within the linear response region
11pages, 2 figures
null
null
null
physics.optics physics.class-ph
null
In this paper, we present the equivalent medium theory by using the linear response theory. It is found that, under the condition of the linear response, a series of different media with different refractive indices $n_{i}(\omega)$ and lengths $d_{i}$ can be equivalent to an effective medium with the volume-averaged refractive index $\frac{1}{D}\sum_{i=1}^{N}n_{i}(\omega)d_{i}$ and the total length $D=\sum_{i=1i}^{N}d_{i}$,where $N$ is the number of different media. Based on this equivalent theory, it is a simple but very useful method to design the effective medium with any desirable dispersion properties. As an example, we present a proposal to obtain the enhancement or reduction of the refractive index without absorption and the large dispersion without obvious absorption by assembling different linear dispersive gain and absorptive media.
[ { "version": "v1", "created": "Tue, 29 Jan 2008 01:16:43 GMT" } ]
2008-01-30T00:00:00
[ [ "Wang", "Li-Gang", "" ] ]
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801.441
Yuzo Maruyama
Yuzo Maruyama, Edward I. George
Fully Bayes factors with a generalized g-prior
Published in at http://dx.doi.org/10.1214/11-AOS917 the Annals of Statistics (http://www.imstat.org/aos/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Annals of Statistics 2011, Vol. 39, No. 5, 2740-2765
10.1214/11-AOS917
IMS-AOS-AOS917
stat.ME math.ST stat.TH
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
For the normal linear model variable selection problem, we propose selection criteria based on a fully Bayes formulation with a generalization of Zellner's $g$-prior which allows for $p>n$. A special case of the prior formulation is seen to yield tractable closed forms for marginal densities and Bayes factors which reveal new model evaluation characteristics of potential interest.
[ { "version": "v1", "created": "Tue, 29 Jan 2008 01:20:08 GMT" }, { "version": "v2", "created": "Mon, 20 Sep 2010 01:57:16 GMT" }, { "version": "v3", "created": "Fri, 5 Aug 2011 05:20:01 GMT" }, { "version": "v4", "created": "Thu, 23 Feb 2012 08:38:37 GMT" } ]
2012-02-24T00:00:00
[ [ "Maruyama", "Yuzo", "" ], [ "George", "Edward I.", "" ] ]
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801.4411
Avinash Kolli
Avinash Kolli, Simon C. Benjamin, Jose Garcia Coello, Sougato Bose and Brendon W. Lovett
Large Spin Entangled Current from a Passive Device
9 pages, 4 figures; Minor corrections made to text and now submitted to New Journal of Physics
New J. Phys. 11 (2009) 013018.
10.1088/1367-2630/11/1/013018
null
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We show that a large entangled current can be produced from a very simple passive device: a cluster of three resonant quantum dots, tunnel coupled to one input lead and two output leads. The device can function in a `clean' mode, when almost all emitted electrons are paired in Bell states, or a `dirty' mode with a far higher emission rate but a significant portion of non-entangled electrons. Subsequent charge detection can enhance performance by identifying the pairs that are most likely to be entangled. The device is robust to specific choice of system parameters and therefore lends itself to immediate experimental demonstration. Applications include quantum repeaters and unconditionally secure interfaces.
[ { "version": "v1", "created": "Tue, 29 Jan 2008 01:23:03 GMT" }, { "version": "v2", "created": "Mon, 25 Aug 2008 23:23:55 GMT" } ]
2009-11-13T00:00:00
[ [ "Kolli", "Avinash", "" ], [ "Benjamin", "Simon C.", "" ], [ "Coello", "Jose Garcia", "" ], [ "Bose", "Sougato", "" ], [ "Lovett", "Brendon W.", "" ] ]
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801.4412
Simon F. Ross
Julian Le Witt and Simon F. Ross
Asymptotically Plane Wave Spacetimes and their Actions
18 pages, v2: references added, v3: small changes to concluding discussion, final version to appear in journal
JHEP 0804:084,2008
10.1088/1126-6708/2008/04/084
DCPT-08/03
hep-th gr-qc
null
We propose a definition of asymptotically plane wave spacetimes in vacuum gravity in terms of the asymptotic falloff of the metric, and discuss the relation to previously constructed exact solutions. We construct a well-behaved action principle for such spacetimes, using the formalism developed by Mann and Marolf. We show that this action is finite on-shell and that the variational principle is well-defined for solutions of vacuum gravity satisfying our asymptotically plane wave falloff conditions.
[ { "version": "v1", "created": "Tue, 29 Jan 2008 17:02:50 GMT" }, { "version": "v2", "created": "Tue, 5 Feb 2008 12:26:47 GMT" }, { "version": "v3", "created": "Mon, 21 Apr 2008 16:03:44 GMT" } ]
2014-11-18T00:00:00
[ [ "Witt", "Julian Le", "" ], [ "Ross", "Simon F.", "" ] ]
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801.4413
Clement Baruteau
C. Baruteau (CE-Saclay), F. Masset (CE-Saclay & IAUNAM)
Type I planetary migration in a self-gravitating disk
42 pages, 17 figures, accepted for publication in ApJ
null
10.1086/529487
null
astro-ph
null
We investigate the tidal interaction between a low-mass planet and a self-gravitating protoplanetary disk, by means of two-dimensional hydrodynamic simulations. We first show that considering a planet freely migrating in a disk without self-gravity leads to a significant overestimate of the migration rate. The overestimate can reach a factor of two for a disk having three times the surface density of the minimum mass solar nebula. Unbiased drift rates may be obtained only by considering a planet and a disk orbiting within the same gravitational potential. In a second part, the disk self-gravity is taken into account. We confirm that the disk gravity enhances the differential Lindblad torque with respect to the situation where neither the planet nor the disk feels the disk gravity. This enhancement only depends on the Toomre parameter at the planet location. It is typically one order of magnitude smaller than the spurious one induced by assuming a planet migrating in a disk without self-gravity. We confirm that the torque enhancement due to the disk gravity can be entirely accounted for by a shift of Lindblad resonances, and can be reproduced by the use of an anisotropic pressure tensor. We do not find any significant impact of the disk gravity on the corotation torque.
[ { "version": "v1", "created": "Tue, 29 Jan 2008 02:09:04 GMT" } ]
2009-11-13T00:00:00
[ [ "Baruteau", "C.", "", "CE-Saclay" ], [ "Masset", "F.", "", "CE-Saclay & IAUNAM" ] ]
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801.4414
Raza Syed M
Raza M. Syed
Problems and Solutions in a Graduate Course in Classical Electrodynamics (1)
64 pages, no figures
null
null
null
physics.class-ph physics.gen-ph
null
The following is the very first set of the series in 'Problems and Solutions in a Graduate Course in Classical Electrodynamics'. In each of the sets of the problems we intend to follow a theme, which not only makes it unique but also deals with the investigation of a certain class of problems in a thorough and rigorous manner. Figures are not included.
[ { "version": "v1", "created": "Tue, 29 Jan 2008 01:38:42 GMT" } ]
2008-01-30T00:00:00
[ [ "Syed", "Raza M.", "" ] ]
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801.4415
Hamilton
Colin S. Wallace, Andrew J. S. Hamilton, Gavin Polhemus (JILA)
Huge entropy production inside black holes
Version 2: Title, abstract, introduction, figure 2, and discussion completely rewritten. Body of text largely unchanged. Version 3: Paper has been split into two. This paper now confines itself to presenting the general relativistic model. A companion paper, arXiv:0903.2290, discusses the quantum gravity implications
null
null
null
gr-qc astro-ph hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We show that the entropy created by Ohmic dissipation inside an accreting charged black hole may exceed the Bekenstein-Hawking entropy by a large factor. If the black hole subsequently evaporates, radiating only the Bekenstein-Hawking entropy, then the black hole appears to destroy entropy, violating the second law of thermodynamics. A companion paper discusses the implications of this startling result. Bousso's covariant entropy bound is not violated.
[ { "version": "v1", "created": "Tue, 29 Jan 2008 02:59:25 GMT" }, { "version": "v2", "created": "Thu, 15 May 2008 00:25:11 GMT" }, { "version": "v3", "created": "Thu, 12 Mar 2009 23:43:05 GMT" } ]
2009-03-13T00:00:00
[ [ "Wallace", "Colin S.", "", "JILA" ], [ "Hamilton", "Andrew J. S.", "", "JILA" ], [ "Polhemus", "Gavin", "", "JILA" ] ]
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801.4416
Jared Weinstein
Jared Weinstein
Hilbert modular forms with prescribed ramification
30 pages, published version
Int. Math. Res. Not., (2009) 1388-1420
null
null
math.NT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Let $K$ be a totally real field. In this article we present an asymptotic formula for the number of Hilbert modular cusp forms $f$ with given ramification at every place $v$ of $K$. When $v$ is an infinite place, this means specifying the weight of $f$ at $k$, and when $v$ is finite, this means specifying the restriction to inertia of the local Weil-Deligne representation attached to $f$ at $v$. Our formula shows that with essentially finitely many exceptions, the cusp forms of $K$ exhibit every possible sort of ramification behavior, thus generalizing a theorem of Khare and Prasad. From this fact we compute the minimal field over which a modular Jacobian becomes semi-stable.
[ { "version": "v1", "created": "Tue, 29 Jan 2008 02:00:56 GMT" }, { "version": "v2", "created": "Wed, 30 Jan 2008 00:32:40 GMT" }, { "version": "v3", "created": "Wed, 13 Feb 2008 00:30:38 GMT" }, { "version": "v4", "created": "Tue, 2 Jun 2009 06:04:32 GMT" } ]
2009-09-29T00:00:00
[ [ "Weinstein", "Jared", "" ] ]
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801.4417
Wei Lianfu
L.F. Wei, J.R. Johansson, L.X. Cen, S. Ashhab, Franco Nori
Controllable coherent population transfers in superconducting qubits for quantum computing
4 pages, 6 figures. to appear in Physical Review Letters
Phys. Rev. Lett. 100, 113601 (2008)
10.1103/PhysRevLett.100.113601
null
quant-ph cond-mat.mes-hall cond-mat.supr-con cs.GT
null
We propose an approach to coherently transfer populations between selected quantum states in one- and two-qubit systems by using controllable Stark-chirped rapid adiabatic passages (SCRAPs). These {\it evolution-time insensitive} transfers, assisted by easily implementable single-qubit phase-shift operations, could serve as elementary logic gates for quantum computing. Specifically, this proposal could be conveniently demonstrated with existing Josephson phase qubits. Our proposal can find an immediate application in the readout of these qubits. Indeed, the broken parity symmetries of the bound states in these artificial "atoms" provide an efficient approach to design the required adiabatic pulses.
[ { "version": "v1", "created": "Tue, 29 Jan 2008 02:14:19 GMT" } ]
2009-11-13T00:00:00
[ [ "Wei", "L. F.", "" ], [ "Johansson", "J. R.", "" ], [ "Cen", "L. X.", "" ], [ "Ashhab", "S.", "" ], [ "Nori", "Franco", "" ] ]
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801.4418
Emi Miyata
Emi Miyata, Kuniaki Masai, John P. Hughes
Evidence for Resonance Line Scattering in the Suzaku X-ray Spectrum of the Cygnus Loop
10 pages, 5 figures. accepted for Publications of the Astronomical Society of Japan
null
10.1093/pasj/60.3.521
null
astro-ph
null
We present an analysis of the Suzaku observation of the northeastern rim of the Cygnus Loop supernova remnant. The high detection efficiency together with the high spectral resolution of the Suzaku X-ray CCD camera enables us to detect highly-ionized C and N emission lines from the Cygnus Loop. Given the significant plasma structure within the Suzaku field of view, we selected the softest region based on ROSAT observations. The Suzaku spectral data are well characterized by a two-component non-equilibrium ionization model with different best-fit values for both the electron temperature and ionization timescale. Abundances of C to Fe are all depleted to typically 0.23 times solar with the exception of O. The abundance of O is relatively depleted by an additional factor of two compared with other heavy elements. We found that the resonance-line-scattering optical depth for the intense resonance lines of O is significant and, whereas the optical depth for other resonance lines is not as significant, it still needs to be taken into account for accurate abundance determination.
[ { "version": "v1", "created": "Tue, 29 Jan 2008 02:29:39 GMT" } ]
2015-05-13T00:00:00
[ [ "Miyata", "Emi", "" ], [ "Masai", "Kuniaki", "" ], [ "Hughes", "John P.", "" ] ]
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801.4419
Anatolii Mal'shukov
A.G. Mal'shukov, C.S. Chu
Spin-Hall effects in a Josephson contact
4 pages
null
10.1103/PhysRevB.78.104503
null
cond-mat.mes-hall cond-mat.supr-con
null
The Josephson tunneling through a 2D normal contact with the spin-orbit split conduction band has been studied in the diffusive regime. Linearized Usadel equations for triplet components of the pairing function revealed a striking similarity to the equations of spin diffusion driven by the electric field in normal metals. Consequently, we predict that the out-of-plane spin-Hall polarization accumulates towards lateral sample edges and the in-plane polarization is finite throughout the entire normal region. At the same time, the spin-Hall current is absent in the considered case of the stationary Josephson effect.
[ { "version": "v1", "created": "Tue, 29 Jan 2008 03:04:03 GMT" } ]
2009-11-13T00:00:00
[ [ "Mal'shukov", "A. G.", "" ], [ "Chu", "C. S.", "" ] ]
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801.442
Shinya Matsuzaki
Lauris Baum, Paul H. Frampton and Shinya Matsuzaki
Constraints on Deflation from the Equation of State of Dark Energy
23 pages, 3 figures, typos fixed
JCAP 0804:032,2008
10.1088/1475-7516/2008/04/032
null
hep-th astro-ph gr-qc hep-ph
null
In cyclic cosmology based on phantom dark energy the requirement that our universe satisfy a CBE-condition ({\it Comes Back Empty}) imposes a lower bound on the number $N_{\rm cp}$ of causal patches which separate just prior to turnaround. This bound depends on the dark energy equation of state $w = p/\rho = -1 - \phi$ with $\phi > 0$. More accurate measurement of $\phi$ will constrain $N_{\rm cp}$. The critical density $\rho_c$ in the model has a lower bound $\rho_c \ge (10^9 {\rm GeV})^4$ or $\rho_c \ge (10^{18} {\rm GeV})^4$ when the smallest bound state has size $10^{-15}$m, or $10^{-35}$m, respectively.
[ { "version": "v1", "created": "Tue, 29 Jan 2008 03:46:53 GMT" }, { "version": "v2", "created": "Wed, 30 Jan 2008 23:32:39 GMT" } ]
2009-01-06T00:00:00
[ [ "Baum", "Lauris", "" ], [ "Frampton", "Paul H.", "" ], [ "Matsuzaki", "Shinya", "" ] ]
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801.4421
Alex Buchel
Alex Buchel
Shear viscosity of boost invariant plasma at finite coupling
33 pages, no figures; v2: references added, typos corrected
Nucl.Phys.B802:281-306,2008
10.1016/j.nuclphysb.2008.03.009
UWO-TH-08/2
hep-th
null
We discuss string theory alpha' corrections in the dual description of the expanding boost invariant N=4 supersymmetric Yang-Mills plasma at strong coupling. We compute finite 't Hooft coupling corrections to the shear viscosity and find that it disagrees with the equilibrium correlation function computations. We comment on the possible source of the discrepancy.
[ { "version": "v1", "created": "Tue, 29 Jan 2008 03:49:45 GMT" }, { "version": "v2", "created": "Tue, 4 Mar 2008 18:27:48 GMT" } ]
2008-11-26T00:00:00
[ [ "Buchel", "Alex", "" ] ]
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801.4422
Harry K. Hahn
Harry K. Hahn
The distribution of natural numbers divisible by 2,3,5,11,13 and 17 on the Square Root Spiral
12 pages, 6 figures. arXiv admin note: substantial text overlap with arXiv:0712.2184
null
null
null
math.GM
null
The natural numbers divisible by the Prime Factors 2, 3, 5, 11, 13 and 17 lie on defined spiral graphs, which run through the Square Root Spiral. A mathematical analysis shows, that these spiral graphs are defined by specific quadratic polynomials. Basically all natural number which are divisible by the same prime factor lie on such spiral graphs. And these spiral graphs can be assigned to a certain number of Spiral Graph Systems, which have a defined spatial orientation to each other. This document represents a supplementation to my detailed introduction study to the Square Root Spiral, and it contains the missing diagrams and analyses, showing the distribution of the natural numbers divisible by 2, 3, 5, 11, 13 and 17 on the Square Root Spiral. My introduction study to the Square Root Spiral can be found in the arxiv-archive. The title of this study : The ordered distribution of the natural numbers on the Square Root Spiral.
[ { "version": "v1", "created": "Tue, 29 Jan 2008 04:38:41 GMT" } ]
2019-07-18T00:00:00
[ [ "Hahn", "Harry K.", "" ] ]
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801.4423
Manas Tungare
Manas Tungare, Manuel Perez-Quinones
It's Not What You Have, But How You Use It: Compromises in Mobile Device Use
null
null
null
null
cs.HC
null
As users begin to use many more devices for personal information management (PIM) than just the traditional desktop computer, it is essential for HCI researchers to understand how these devices are being used in the wild and their roles in users' information environments. We conducted a study of 220 knowledge workers about their devices, the activities they performed on each, and the groups of devices used together. Our findings indicate that several devices are often used in groups; integrated multi-function portable devices have begun to replace single-function devices for communication (e.g. email and IM). Users use certain features opportunistically because they happen to be carrying a multi-function device with them. The use of multiple devices and multi-function devices is fraught with compromises as users must choose and make trade-offs among various factors.
[ { "version": "v1", "created": "Tue, 29 Jan 2008 04:42:26 GMT" } ]
2008-01-30T00:00:00
[ [ "Tungare", "Manas", "" ], [ "Perez-Quinones", "Manuel", "" ] ]
[ 0.1023446172, 0.1036809981, 0.0826886594, 0.0292612053, 0.122835815, -0.1390951276, -0.0015947844, 0.0927672088, 0.0721646473, -0.0336601324, -0.0072735394, -0.0174843371, -0.0540121198, 0.0136213563, 0.0144078722, -0.0662622899, -0.0208531339, -0.0498359278, 0.0141851427, 0.0878671408, 0.0542348512, 0.136088267, 0.004757382, 0.026713727, -0.0514507219, 0.0366113074, -0.1001729965, 0.1013980135, 0.0723873824, -0.0089579383, 0.0310987327, -0.0341334343, 0.0364442617, -0.0682668686, 0.0325186364, 0.1366450936, -0.0357203893, 0.0855841562, 0.0263796318, 0.0714407787, -0.0310987327, -0.0163706839, 0.0162732396, 0.0668748021, 0.0202545449, 0.0257114395, -0.0085820807, 0.0617520027, 0.0137118399, 0.0343840048, -0.0915421918, 0.0829113945, 0.0667634383, -0.0146862855, 0.0079069296, -0.0462722406, -0.0080182943, -0.0268390123, -0.0554598682, 0.0053838114, 0.0064731021, -0.140654251, 0.0613065436, 0.1209426075, -0.0932683572, -0.0256139953, 0.0274793636, 0.0006025031, -0.145888418, -0.029790191, -0.0074614682, 0.0124032991, -0.099115029, 0.0788465589, -0.0525922142, 0.0239574388, -0.0117211873, 0.0655940995, 0.0409545526, 0.045297794, 0.1098060831, -0.0364721045, -0.0404812507, 0.0745590031, -0.1279586107, 0.0374465473, -0.1071333215, -0.1282927096, -0.1239494681, -0.083579585, -0.0219111033, 0.0251406934, -0.016287161, 0.0453813188, 0.0304026995, -0.0051401998, 0.0117768701, 0.0591906048, -0.0229412317, 0.1459997743, -0.0104892096, -0.0122849736, -0.0713294074, 0.0253495034, 0.0571303479, -0.0656497851, 0.0759510696, 0.0232753269, -0.0380868986, 0.0545132644, -0.1345291585, -0.0316555575, -0.0813522786, 0.1290722638, -0.0004676468, 0.0147141274, -0.023247486, 0.0199065302, 0.0540121198, -0.0380033739, 0.0128278788, -0.0467733853, 0.0672645792, 0.011338369, 0.0025370384, -0.0235398188, 0.0092154704, 0.0034314401, -0.0606383495, -0.1399860531, 0.0216466114, -0.016315002, 0.071385093, -0.0800715759, -0.0354141332, -0.0189599246, -0.0349965133, 0.0657611489, -0.092655845, -0.087421678, -0.0027528086, -0.0270199813, 0.0409823917, -0.0222451985, -0.051756978, -0.0166490972, -0.0280083474, 0.1204971448, -0.0081087789, 0.0918762907, 0.0674873143, -0.0344953686, -0.0580769517, 0.002183802, 0.0585224107, -0.1152629778, 0.0947717875, 0.1280699819, -0.0714964569, -0.0458546206, 0.0461608768, -0.0561280586, -0.0856398419, -0.0425693467, 0.004861787, 0.0220085476, -0.0579655878, 0.0198230054, -0.0629770234, 0.0801272616, -0.093880862, -0.1125902161, -0.0980570614, 0.0313493051, -0.0477478281, -0.083245486, -0.0071099717, -0.0236929469, -0.08970467, -0.0451864302, -0.0393954404, 0.0621417798, -0.0123128146, -0.0669304878, -0.0995604917, -0.1214994341, -0.0467733853, 0.0696032494, -0.0870319009, -0.0371124521, -0.0192244183, 0.0838023126, -0.0001842311, 0.0323794335, -0.0476086214, -0.0221477542, -0.0040752701, -0.0080600567, -0.1648204923, 0.008053096, 0.0295396186, 0.0076076351, 0.0829113945, -0.0358039103, -0.0486109108, -0.0046355766, -0.0771760866, 0.0761181116, 0.0402863622, 0.0819091052, -0.0198508464, -0.019182656, 0.0471353196, -0.0039952267, 0.015716413, -0.0497245602, -0.1010639146, 0.0005755319, -0.0528706275, 0.1084140241, 0.0262682661, 0.0339385457, 0.1467793286, -0.017512178, 0.012250172, 0.0536780246, -0.0468847491, -0.0876444131, 0.0525365323, -0.0477478281, 0.0766749382, 0.0006768916, -0.0913194641, -0.0193497036, 0.0777885914, 0.02548871, 0.0157442559, -0.0557104424, -0.064925909, -0.0379198492, -0.0326856859, 0.0129810059, 0.0056970259, 0.0093059549, -0.0425136648, 0.0508938953, -0.0399801061, -0.0209644996, 0.0233449303, -0.0890364796, 0.0581326336, 0.0380033739, 0.0182778127, -0.0030347016, 0.0279526655, 0.01694143 ]
801.4424
Herve Bouy
H. Bouy, E. L. Martin, W. Brandner, T. Forveille, X. Delfosse, N. Huelamo, G. Basri, J. Girard, M.-R. Zapatero Osorio, M. Stumpf, A. Ghez, L. Valdivielso, F. Marchis, A.J. Burgasser, K. Cruz
Follow-up observations of binary ultra-cool dwarfs
13 pages, 6 Tables, 4 Figures, Accepted for A&A, reference pb corrected
null
10.1051/0004-6361:20078803
null
astro-ph
null
Astrometric observations of resolved binaries provide estimates of orbital periods and will eventually lead to measurement of dynamical masses. Only a few very low mass star and brown dwarf masses have been measured to date, and the mass-luminosity relation still needs to be calibrated. We have monitored 14 very low mass multiple systems for several years to confirm their multiplicity and, for those with a short period, derive accurate orbital parameters and dynamical mass estimates. We have used high spatial resolution images obtained at the Paranal, Lick and HST observatories to obtain astrometric and photometric measurements of the multiple systems at several epochs. The targets have periods ranging from 5 to 200 years, and spectral types in the range M7.5 - T5.5. All of our 14 multiple systems are confirmed as common proper motion pairs. One system (2MASSW J0920122+351742) is not resolved in our new images, probably because the discovery images were taken near maximum elongation. Six systems have periods short enough to allow dynamical mass measurements within the next 15 to 20years. We estimate that only 8% of the ultracool dwarfs in the solar neighborhood are binaries with separations large enough to be resolved, and yet periods short enough to derive astrometric orbital fits over a reasonable time frame with current instrumentation. A survey that doubles the number of ultracool dwarfs observed with high angular resolution is called for to discover enough binaries for a first attempt to derive the mass-luminosity relationship for very low-mass stars and brown dwarfs.
[ { "version": "v1", "created": "Tue, 29 Jan 2008 04:39:27 GMT" }, { "version": "v2", "created": "Wed, 30 Jan 2008 20:49:12 GMT" } ]
2009-11-13T00:00:00
[ [ "Bouy", "H.", "" ], [ "Martin", "E. L.", "" ], [ "Brandner", "W.", "" ], [ "Forveille", "T.", "" ], [ "Delfosse", "X.", "" ], [ "Huelamo", "N.", "" ], [ "Basri", "G.", "" ], [ "Girard", "J.", "" ], [ "Osorio", "M. -R. Zapatero", "" ], [ "Stumpf", "M.", "" ], [ "Ghez", "A.", "" ], [ "Valdivielso", "L.", "" ], [ "Marchis", "F.", "" ], [ "Burgasser", "A. J.", "" ], [ "Cruz", "K.", "" ] ]
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801.4425
Laura Valentina Spinolo
Stefano Bianchini and Laura V. Spinolo
Invariant manifolds for a singular ordinary differential equation
35 pages, more general case considered
null
null
Preprint SISSA 04/2008/M
math.CA math.AP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the singular ordinary differential equation $$ \frac{d U}{d t} = f (U) / z (U) + g (U), $$ where $U \in R^N$, the functions $f \in R^N $ and $g \in R^N $ are of class $C^2$ and $z $ is a real valued $C^2$ function. The equation is singular in the sense that $z (U)$ can attain the value 0. We focus on the solutions of the singular ODE that belong to a small neighborhood of a point $\bar U$ such that $f (\bar U) = g (\bar U) = \vec 0$, $z (\bar U) =0$. We investigate the existence of manifolds that are locally invariant for the singular ODE and that contain orbits with a suitable prescribed asymptotic behaviour. Under suitable hypotheses on the set $\{U: z (U) = 0 \}$, we extend to the case of the singular ODE the definitions of center manifold, center stable manifold and of uniformly stable manifold. An application of our analysis concerns the study of the viscous profiles with small total variation for a class of mixed hyperbolic-parabolic systems in one space variable. Such a class includes the compressible Navier Stokes equation.
[ { "version": "v1", "created": "Tue, 29 Jan 2008 04:43:04 GMT" }, { "version": "v2", "created": "Wed, 25 Mar 2009 09:38:37 GMT" } ]
2009-03-25T00:00:00
[ [ "Bianchini", "Stefano", "" ], [ "Spinolo", "Laura V.", "" ] ]
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801.4426
Tim Gould
Tim Gould and Ken Simpkins and John F. Dobson
A theoretical and semiemprical correction to the long-range dispersion power law of stretched graphite
null
Phys. Rev. B 77, 165134 (2008)
10.1103/PhysRevB.77.165134
null
cond-mat.mtrl-sci
null
In recent years intercalated and pillared graphitic systems have come under increasing scrutiny because of their potential for modern energy technologies. While traditional \emph{ab initio} methods such as the LDA give accurate geometries for graphite they are poorer at predicting physicial properties such as cohesive energies and elastic constants perpendicular to the layers because of the strong dependence on long-range dispersion forces. `Stretching' the layers via pillars or intercalation further highlights these weaknesses. We use the ideas developed by [J. F. Dobson et al, Phys. Rev. Lett. {\bf 96}, 073201 (2006)] as a starting point to show that the asymptotic $C_3 D^{-3}$ dependence of the cohesive energy on layer spacing $D$ in bigraphene is universal to all graphitic systems with evenly spaced layers. At spacings appropriate to intercalates, this differs from and begins to dominate the $C_4 D^{-4}$ power law for dispersion that has been widely used previously. The corrected power law (and a calculated $C_3$ coefficient) is then unsuccesfully employed in the semiempirical approach of [M. Hasegawa and K. Nishidate, Phys. Rev. B {\bf 70}, 205431 (2004)] (HN). A modified, physicially motivated semiempirical method including some $C_4 D^{-4}$ effects allows the HN method to be used successfully and gives an absolute increase of about $2-3%$ to the predicted cohesive energy, while still maintaining the correct $C_3 D^{-3}$ asymptotics.
[ { "version": "v1", "created": "Tue, 29 Jan 2008 05:04:56 GMT" } ]
2012-08-28T00:00:00
[ [ "Gould", "Tim", "" ], [ "Simpkins", "Ken", "" ], [ "Dobson", "John F.", "" ] ]
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801.4427
Masashi Wakamatsu
M. Wakamatsu and Y. Nakakoji
On the physics behind the form factor ratio $\mu_p G_E^p (Q^2) / G_M^p (Q^2)$
12 pages, 5 figures. version to appear in J. Phys. G.: Nucl. Part. Phys
J.Phys.G35:125003,2008
10.1088/0954-3899/35/12/125003
OU-HET-597
nucl-th hep-ex hep-ph nucl-ex
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We point out that there exist two natural definitions of the nucleon magnetization densities : the density $\rho_M^K (r)$ introduced in Kelly's phenomenological analysis and theoretically more standard one $\rho_M (r)$. We can derive an explicit analytical relation between them, although Kelly's density is more useful to disentangle the physical origin of the different $Q^2$ dependence of the Sachs electric and magnetic form factors of the nucleon. We evaluate both of $\rho_M (r)$ and $\rho_M^K (r)$ as well as the charge density $\rho_{ch}(r)$ of the proton within the framework of the chiral quark soliton model, to find a noticeable qualitative difference between $\rho_{ch}(r)$ and $\rho_M^K (r)$, which is just consistent with Kelly's result obtained from the empirical information on the Sachs electric and magnetic form factors of the proton.
[ { "version": "v1", "created": "Tue, 29 Jan 2008 05:25:16 GMT" }, { "version": "v2", "created": "Fri, 3 Oct 2008 08:20:00 GMT" } ]
2008-11-26T00:00:00
[ [ "Wakamatsu", "M.", "" ], [ "Nakakoji", "Y.", "" ] ]
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801.4428
Jun'ichi Wakou
Jun'ichi Wakou, Akinori Ochiai, Masaharu Isobe
A Langevin Approach to One-Dimensional Granular Media Fluidized by Vibrations
11 pages, 3 figures, to be published in J. Phys. Soc. Jpn
J. Phys. Soc. Jpn. 77, 034402 (2008)
10.1143/JPSJ.77.034402
null
cond-mat.soft cond-mat.stat-mech
null
We present a Langevin approach to describe the steady-state dynamics of one-dimensional granular media fluidized by a vibrating bottom plate. We adopt a linear Langevin equation to describe the motion of the center of mass. Within this framework, we derive analytical expressions for several macroscopic quantities. We also predict the power spectrum for the height of the center of mass. We find good agreement between our theoretical predictions and extensive event-driven molecular dynamics simulations.
[ { "version": "v1", "created": "Tue, 29 Jan 2008 05:27:32 GMT" } ]
2010-03-29T00:00:00
[ [ "Wakou", "Jun'ichi", "" ], [ "Ochiai", "Akinori", "" ], [ "Isobe", "Masaharu", "" ] ]
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801.4429
Takayuki Morifuji
Teruaki Kitano, Takayuki Morifuji
$L^2$-torsion invariants and the Magnus representation of the mapping class group
14 pages
null
null
null
math.GT
null
In this paper, we study a series of $L^2$-torsion invariants from the viewpoint of the mapping class group of a surface. We establish some vanishing theorems for them. Moreover we explicitly calculate the first two invariants and compare them with hyperbolic volumes.
[ { "version": "v1", "created": "Tue, 29 Jan 2008 05:36:58 GMT" } ]
2008-01-30T00:00:00
[ [ "Kitano", "Teruaki", "" ], [ "Morifuji", "Takayuki", "" ] ]
[ 0.0612433292, 0.0016397864, -0.0140790679, -0.0059309457, 0.00820971, 0.0187967252, -0.0484329797, -0.0768128335, -0.0237853713, -0.086371325, 0.0098725921, -0.0117571922, -0.0196466427, 0.0090349922, 0.0391701087, 0.1018915549, -0.0071750279, -0.0236621946, -0.048950322, 0.1157858595, -0.0208784081, -0.0574494936, 0.1040594652, 0.0290203709, 0.0324200392, 0.0086038746, 0.0425205082, 0.1016944721, 0.1950129569, -0.0120220212, 0.028034959, -0.0469302274, -0.0578929298, -0.079374902, -0.102187179, 0.1038623825, 0.0682890192, 0.0405004174, -0.0553308614, -0.0174294673, -0.0664167404, 0.076270856, -0.0235143844, 0.0065653045, 0.0435551926, 0.0517833792, 0.0305231232, -0.0205581486, -0.0028407569, -0.0193263851, -0.0280842297, -0.0041356492, 0.035031382, -0.0611447878, -0.1418992728, 0.0297347941, -0.0628692582, 0.1068186164, 0.1038623825, -0.03283884, -0.0092197573, -0.0934170187, -0.0594203174, -0.0362877809, -0.0532122254, 0.0607506223, -0.1173625216, 0.0377166271, 0.0223072544, 0.0611447878, -0.1494869292, -0.00183071, -0.0135986796, 0.0498371907, 0.0814935341, 0.0017814394, -0.083415091, 0.1063259095, -0.0458955429, 0.042027805, 0.0247954186, 0.0988367796, 0.0210385378, 0.0159883033, 0.0073659513, -0.0230709482, 0.0259655956, 0.0220485833, -0.1159829423, 0.0650371611, 0.0204965603, 0.0588290729, 0.0269263722, 0.0620316602, 0.1587498039, -0.065529868, -0.0034674171, -0.0373717323, 0.0508965068, -0.0521775447, 0.0329620168, 0.0332822762, -0.0019446482, -0.0010585476, 0.1193333417, 0.1057346612, -0.0157542676, -0.0317548886, -0.1172639802, -0.0308926534, -0.0473490246, 0.0239085481, -0.1003149003, 0.0266800188, 0.1110558882, -0.0402786992, -0.0194372442, 0.0451811217, -0.0457477309, 0.0424958728, 0.0480388142, -0.0247215126, 0.0534585789, 0.0421509817, 0.0592232347, -0.0815428048, -0.05523232, -0.0274437126, 0.0308433827, -0.041953899, 0.0693729743, -0.0369775705, -0.0040709814, 0.0039200904, -0.0228122789, -0.0399091691, 0.0267292894, -0.0272466298, 0.1071142405, 0.0539020151, 0.0023957819, 0.0086285099, 0.14633362, 0.0198683608, 0.0004222642, -0.0705062002, 0.040672861, 0.1009061486, 0.0908549502, -0.0503791682, -0.0624750927, 0.0393179208, 0.0031240627, -0.0233296193, -0.0263351239, -0.0425205082, 0.046683874, 0.0390715674, 0.0481619909, 0.0336518064, 0.0811486468, 0.0712452605, 0.0628199875, -0.0138573507, 0.0024311952, 0.0620316602, -0.0303753112, 0.0352777354, -0.0491966717, -0.0836121738, -0.0045452109, -0.1015959308, -0.0848439336, -0.0801139623, 0.0687817261, -0.0626229048, -0.0600608364, -0.0790300071, -0.0535571203, -0.0332083702, -0.0161977019, 0.0198929962, 0.0633619651, -0.0070333751, -0.099083133, 0.1443627924, 0.1252458096, 0.0816413462, 0.0677963197, 0.0663674697, -0.0440971665, 0.059962295, 0.1387459487, 0.1906771362, 0.0297594294, -0.1065229923, 0.0256699715, -0.0268278308, -0.0425944142, 0.0183656085, 0.07316681, -0.0146087268, 0.1675199717, -0.0218145493, -0.0004746142, 0.0484083444, 0.0637561306, 0.0288971942, -0.0708018243, 0.02368683, -0.0320751481, 0.0399830751, -0.0257438775, -0.0002084376, 0.020237891, 0.0641995668, -0.0410177559, -0.0590754226, -0.0426190495, 0.1268224716, -0.0212356187, 0.0534585789, -0.0040001553, 0.069274433, 0.0809022933, 0.0740044117, 0.1072127819, -0.1169683561, -0.0188829489, 0.0251403134, 0.0522268154, -0.013881986, -0.0088687045, -0.0431363918, -0.0188829489, -0.0426436849, 0.0102667566, 0.0482112616, -0.0431610271, -0.0807544813, 0.0978021026, -0.0313853584, 0.0366080403, 0.0478417315, -0.0461665317, 0.0309419241, -0.0321490541, 0.0308926534, 0.0455260165, -0.0776011646, -0.0204226542, 0.098935321, 0.0362631455, 0.0049855667, -0.0722799376, 0.0418307222 ]
801.443
Vitaly Alperovich L
D. A. Orlov, V. L. Alperovich, A. S. Terekhov
Magnetically induced spin-dependent photoemission from p-GaAs(Cs,O) into vacuum
7 pages, 6 figures, published version
Phys. Rev. B 77, 205325 (2008)
10.1103/PhysRevB.77.205325
null
cond-mat.mes-hall
null
A spin-dependent emission of optically oriented electrons from p-GaAs(Cs,O) into vacuum was experimentally observed in a magnetic field normal to the surface. This phenomenon is explained within the model which takes into account the jump in the electron g factor at the semiconductor-vacuum interface. Due to this jump, the effective electron affinity on the semiconductor surface depends on the mutual direction of optically oriented electron spins and the magnetic field, resulting in the spin-dependent photoemission. It is demonstrated that the observed effect can be used for the determination of spin diffusion length in semiconductors.
[ { "version": "v1", "created": "Tue, 29 Jan 2008 05:41:42 GMT" }, { "version": "v2", "created": "Sat, 24 May 2008 08:35:15 GMT" } ]
2008-05-24T00:00:00
[ [ "Orlov", "D. A.", "" ], [ "Alperovich", "V. L.", "" ], [ "Terekhov", "A. S.", "" ] ]
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801.4431
Xinping Xu
Xinping Xu, Feng Liu
Phase space patterns of quantum transport on ordered and disordered networks
Syntax corrected and more discussion added. Accepted for publication in Phys. ReV. A
Phys. Rev. A 77, 062318 (2008)
10.1103/PhysRevA.77.062318
null
quant-ph
null
In this paper, we consider the quantum-mechanical phase space patterns on ordered and disordered networks. For ordered networks in which each node is connected to its 2m nearest neighbors (m on either side), the phase space quasi-probability of Wigner function shows various patterns. In the long time limit, on even-numbered networks, we find an asymmetric quasi-probability between the node and its opposite node. This asymmetry depends on the network parameters and specific phase space positions. For disordered networks in which each edge is rewired with probability p>0, the phase space displays regional localization on the initial node.
[ { "version": "v1", "created": "Tue, 29 Jan 2008 05:51:21 GMT" }, { "version": "v2", "created": "Fri, 18 Apr 2008 01:45:42 GMT" } ]
2009-11-13T00:00:00
[ [ "Xu", "Xinping", "" ], [ "Liu", "Feng", "" ] ]
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801.4432
Steven Sam
Steven V Sam
A bijective proof for a theorem of Ehrhart
14 pages, 4 figures; v5: polished exposition, final version
Amer. Math. Monthly 116 (2009), no. 8, 688-701
10.4169/193009709X460813
null
math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We give a new proof for a theorem of Ehrhart regarding the quasi-polynomiality of the function that counts the number of integer points in the integral dilates of a rational polytope. The proof involves a geometric bijection, inclusion-exclusion, and recurrence relations, and we also prove Ehrhart reciprocity using these methods.
[ { "version": "v1", "created": "Tue, 29 Jan 2008 06:35:48 GMT" }, { "version": "v2", "created": "Tue, 29 Jan 2008 22:14:41 GMT" }, { "version": "v3", "created": "Fri, 8 Feb 2008 01:56:50 GMT" }, { "version": "v4", "created": "Sat, 8 Mar 2008 18:58:13 GMT" }, { "version": "v5", "created": "Fri, 27 Jun 2008 08:12:10 GMT" } ]
2012-12-27T00:00:00
[ [ "Sam", "Steven V", "" ] ]
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801.4433
Rajendra Zope
Rajendra R. Zope, Tunna Baruah, Mark R. Pederson, and B. I. Dunlap (The University of Texas at El Paso and US Naval Research Laboratory, Washington, DC)
Static dielectric response of icosahedral fullerenes from C60 to C2160 by an all electron density functional theory
RevTex, 3 figures
null
10.1103/PhysRevB.77.115452
null
cond-mat.mtrl-sci physics.atm-clus
null
The static dielectric response of C60, C180, C240, C540, C720, C960, C1500, and C2160 fullerenes is characterized by an all-electron density-functional method. First, the screened polarizabilities of C60, C180, C240, and C540, are determined by the finite-field method using Gaussian basis set containing 35 basis functions per atom. In the second set of calculations, the unscreened polarizabilities are calculated for fullerenes C60 through C2160 from the self-consistent Kohn-Sham orbitals and eigen-values using the sum-over-states method. The approximate screened polarizabilities, obtained by applying a correction determined within linear response theory show excellent agreement with the finite-field polarizabilities. The static dipole polarizability per atom in C2160 is (4 Angstrom^3) three times larger than that in C60 (1.344 Angstrom^3). Our results reduce the uncertainty in various theoretical models used previously to describe the dielectric response of fullerenes and show that quantum size effects in polarizability are significantly smaller than previously thought.
[ { "version": "v1", "created": "Tue, 29 Jan 2008 06:36:23 GMT" } ]
2009-11-13T00:00:00
[ [ "Zope", "Rajendra R.", "", "The University of Texas at El Paso and US Naval Research Laboratory,\n Washington, DC" ], [ "Baruah", "Tunna", "", "The University of Texas at El Paso and US Naval Research Laboratory,\n Washington, DC" ], [ "Pederson", "Mark R.", "", "The University of Texas at El Paso and US Naval Research Laboratory,\n Washington, DC" ], [ "Dunlap", "B. I.", "", "The University of Texas at El Paso and US Naval Research Laboratory,\n Washington, DC" ] ]
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801.4434
M\'at\'e Csan\'ad
Mate Csanad, Boris Tomasik, Tamas Csorgo
Interplay among the azimuthally dependent HBT radii and the elliptic flow
7 pages, 4 figures, prepared with svjour.cls, accepted at Eur. Phys. J. A
Eur.Phys.J.A37:111-119,2008
10.1140/epja/i2008-10605-7
null
nucl-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a calculation of the elliptic flow and azimuthal dependence of the correlation radii in the ellipsoidally symmetric generalization of the Buda-Lund model. The elliptic flow is shown to depend only on the flow anisotropy while in case of correlation radii both flow and space anisotropy play an important role in determining their azimuthal oscillation. We also outline a simple procedure for determining the parameters of the model from data.
[ { "version": "v1", "created": "Tue, 29 Jan 2008 07:46:00 GMT" }, { "version": "v2", "created": "Thu, 12 Jun 2008 15:09:17 GMT" } ]
2008-11-26T00:00:00
[ [ "Csanad", "Mate", "" ], [ "Tomasik", "Boris", "" ], [ "Csorgo", "Tamas", "" ] ]
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801.4435
Michael Springborg
Michael Springborg and Bernard Kirtman
How much can donor/acceptor-substitution change the responses of long push-pull systems to DC fields?
Accepted by Chem. Phys. Lett
null
10.1016/j.cplett.2008.01.078
null
cond-mat.mtrl-sci
null
Mathematical arguments are presented that give a unique answer to the question in the title. Subsequently, the mathematical analysis is extended using results of detailed model calculations that, in addition, throw further light on the consequences of the analysis. Finally, through a comparison with various recent studies, many of the latter are given a new interpretation.
[ { "version": "v1", "created": "Tue, 29 Jan 2008 06:58:38 GMT" } ]
2009-11-13T00:00:00
[ [ "Springborg", "Michael", "" ], [ "Kirtman", "Bernard", "" ] ]
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801.4436
Jing Chen
J. Chen, Y. J. Chen, J. Fan, J. Liu, S. G. Chen, and X. T. He
Modulations to molecular high order harmonic generation by electron de Broglie wave
5 pages, 3 figures
null
null
null
physics.atom-ph physics.atm-clus
null
We present a new theory that the molecular high order harmonic generation in an intense laser field is determined by molecular internal symmetry and momentum distribution of the tunneling-ionized electron. The molecular internal symmetry determines the quantum interference form of the returning electron inside the molecule. The electron momentum distribution determines the relative interference strength of each individual electron de Broglie wave. All individual electron de Broglie wave interferences add together to collectively modulate the molecular high harmonic generation. We specifically discuss the suppression of the generation on adjacent harmonic orders and the dependence of molecular high harmonic generation on laser intensities and molecular axis alignment. Our theoretical results are in good consistency with the experimental observations.
[ { "version": "v1", "created": "Tue, 29 Jan 2008 07:03:29 GMT" } ]
2008-01-30T00:00:00
[ [ "Chen", "J.", "" ], [ "Chen", "Y. J.", "" ], [ "Fan", "J.", "" ], [ "Liu", "J.", "" ], [ "Chen", "S. G.", "" ], [ "He", "X. T.", "" ] ]
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801.4437
Hing Tong Cho
Hing-Tong Cho and Choon-Lin Ho
Self-Adjoint Extensions of the Hamiltonian Operator with Symmetric Potentials which are Unbounded from Below
RevTex, 16 pages; title changed, extension scheme clarified
null
10.1088/1751-8113/41/25/255308
null
quant-ph hep-th math-ph math.MP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the self-adjoint extensions of the Hamiltonian operator with symmetric potentials which go to $-\infty$ faster than $-|x|^{2p}$ with $p>1$ as $x\to\pm\infty$. In this extension procedure, one requires the Wronskian between any states in the spectrum to approach to the same limit as $x\to\pm\infty$. Then the boundary terms cancel and the Hamiltonian operator can be shown to be hermitian. Discrete bound states with even and odd parities are obtained. Since the Wronskian is not required to vanish asymptotically, the energy eigenstates could be degenerate. Some explicit examples are given and analyzed.
[ { "version": "v1", "created": "Tue, 29 Jan 2008 07:11:57 GMT" }, { "version": "v2", "created": "Fri, 6 Jun 2008 14:35:59 GMT" } ]
2009-11-13T00:00:00
[ [ "Cho", "Hing-Tong", "" ], [ "Ho", "Choon-Lin", "" ] ]
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801.4438
Will Saunders
W. Saunders, P.R. Gillingham, A.J. McGrath, J.W.V. Storey, J.S. Lawrence
PILOT: design and capabilities
4 pages, Proceedings of 2nd ARENA conference 'The Astrophysical Science Cases at Dome C', Potsdam, 17-21 September 2007
null
10.1051/eas:0833041
null
astro-ph
null
The proposed design for PILOT is a general-purpose, wide-field 1 degree 2.4m, f/10 Ritchey-Chretien telescope, with fast tip-tilt guiding, for use 0.5-25 microns. The design allows both wide-field and diffraction-limited use at these wavelengths. The expected overall image quality, including median seeing, is 0.28-0.3" FWHM from 0.8-2.4 microns. Point source sensitivities are estimated.
[ { "version": "v1", "created": "Tue, 29 Jan 2008 07:37:22 GMT" } ]
2009-11-13T00:00:00
[ [ "Saunders", "W.", "" ], [ "Gillingham", "P. R.", "" ], [ "McGrath", "A. J.", "" ], [ "Storey", "J. W. V.", "" ], [ "Lawrence", "J. S.", "" ] ]
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801.4439
Christopher J. Hillar
Matthias Aschenbrenner, Christopher J. Hillar
An Algorithm for Finding Symmetric Gr\"obner Bases in Infinite Dimensional Rings
preliminary abstract, 10 pages
null
null
null
math.AC math.CO
null
A \textit{symmetric ideal} $I \subseteq R = K[x_1,x_2,...]$ is an ideal that is invariant under the natural action of the infinite symmetric group. We give an explicit algorithm to find Gr\"obner bases for symmetric ideals in the infinite dimensional polynomial ring $R$. This allows for symbolic computation in a new class of rings. In particular, we solve the ideal membership problem for symmetric ideals of $R$.
[ { "version": "v1", "created": "Tue, 29 Jan 2008 07:54:54 GMT" } ]
2008-01-30T00:00:00
[ [ "Aschenbrenner", "Matthias", "" ], [ "Hillar", "Christopher J.", "" ] ]
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801.444
Will Saunders
W. Saunders
PILOT and cosmic shear
6 pages, Proceedings of 2nd ARENA conference 'The Astrophysical Science Cases at Dome C', Potsdam, 17-21 September 2007
null
10.1051/eas:0833036
null
astro-ph
null
Cosmic shear offers a remarkbly clean way to measure the equation of state of the Universe and its evolution. Resolution over a wide field is paramount, and Antarctica offers unique possibilities in this respect. There is an order of magnitude gain in speed over temperate sites, or a factor three in surface density. This means that PILOT outperforms much larger telescopes elsewhere, and can compete with the proposed DUNE space mission. Keywords: Antarctic astronomy, Surveys, Adaptive optics, Weak lensing
[ { "version": "v1", "created": "Tue, 29 Jan 2008 07:51:19 GMT" } ]
2009-11-13T00:00:00
[ [ "Saunders", "W.", "" ] ]
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801.4441
Nami Sakai
Nami Sakai, Takeshi Sakai, Yuri Aikawa, and Satoshi Yamamoto
Detection of HCO2+ toward the Low-Mass Protostar IRAS 04368+2557 in L1527
To be published in ApJ(Letter)
Astrophys.J.675:L89-L92,2008
10.1086/533463
null
astro-ph
null
The millimeter-wave rotational emission lines (4(04)-3(03) and 5(05)-4(04)) of protonated carbon dioxide, HCO2+(HOCO+), has been detected toward the low-mass class 0 protostar IRAS 04368+2557 in L1527 with the IRAM 30 m telescope. This is the first detection of HCO2+ except for the Galactic Center clouds. The column density of HCO2+ averaged over the beam size (29") is determined to be 7.6x10^10 cm^-2, assuming the rotational temperature of 12.3 K. The fractional abundance of gaseous CO2 relative to H2 is estimated from the column density of HCO2+ with an aid of a simplified chemical model. If the HCO2+ emission only comes from the evaporation region of CO2 near the protostar (T>50 K), the fractional abundance of CO2 is estimated to be higher than 6.6x10^-4. This is comparable to the elemental abundance of carbon in interstellar clouds, and hence, the direct evaporation of CO2 from dust grain is unrealistic as a source of gaseous CO2 in L1527. A narrow line width of HCO2+ also supports this. On the other hand, the fractional abundance of CO2 is estimated to be 2.9x10^-7, if the source size is comparable to the beam size. These results indicate that gaseous CO2 is abundant even in the low-mass star-forming region. Possible production mechanisms of gaseous CO2 are discussed.
[ { "version": "v1", "created": "Tue, 29 Jan 2008 07:51:45 GMT" } ]
2011-02-11T00:00:00
[ [ "Sakai", "Nami", "" ], [ "Sakai", "Takeshi", "" ], [ "Aikawa", "Yuri", "" ], [ "Yamamoto", "Satoshi", "" ] ]
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801.4442
Betsy Jane Becker
Betsy Jane Becker, Meng-Jia Wu
The Synthesis of Regression Slopes in Meta-Analysis
Published in at http://dx.doi.org/10.1214/07-STS243 the Statistical Science (http://www.imstat.org/sts/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Statistical Science 2007, Vol. 22, No. 3, 414-429
10.1214/07-STS243
IMS-STS-STS243
stat.ME
null
Research on methods of meta-analysis (the synthesis of related study results) has dealt with many simple study indices, but less attention has been paid to the issue of summarizing regression slopes. In part this is because of the many complications that arise when real sets of regression models are accumulated. We outline the complexities involved in synthesizing slopes, describe existing methods of analysis and present a multivariate generalized least squares approach to the synthesis of regression slopes.
[ { "version": "v1", "created": "Tue, 29 Jan 2008 07:58:20 GMT" } ]
2009-09-29T00:00:00
[ [ "Becker", "Betsy Jane", "" ], [ "Wu", "Meng-Jia", "" ] ]
[ 0.0127451131, 0.0361149944, 0.084076263, -0.0535617396, -0.0989186689, -0.0149922166, 0.0467858575, -0.0466475748, -0.0397564545, -0.0238999687, -0.071538575, -0.1248237491, -0.1002093181, -0.0251445174, 0.0408396758, 0.0223558042, 0.0644861236, -0.0261355489, -0.0442737117, 0.0474311784, -0.030837182, -0.0155453505, 0.0392955095, -0.0118693188, 0.0166861881, -0.0779457018, 0.0330958106, -0.0923732594, 0.0192905236, -0.0031430647, 0.0298231039, -0.0460944399, -0.0804808959, -0.0923732594, 0.0264121145, 0.0255132727, -0.1107188463, -0.0505195074, 0.065269731, -0.0429369733, 0.0910826176, -0.0105901975, -0.1186470911, 0.0427065007, 0.0217565764, -0.0684502423, 0.1161579937, -0.1342270076, 0.0661916211, 0.0892849341, -0.0775769427, -0.0508882627, 0.0250984225, -0.0473850854, -0.0802504197, 0.0224825647, 0.1153282896, 0.0033072762, -0.0356310047, -0.0262277368, 0.009247697, -0.0965217575, -0.0661916211, 0.0804808959, -0.0490444861, -0.0147271743, 0.0116618937, 0.0147041269, -0.0311137475, -0.0056580929, 0.0705705881, -0.0062285112, 0.0483069755, 0.1252846867, -0.0708471537, -0.0137361437, -0.03599976, 0.1375458091, -0.1078609899, -0.0077957222, 0.0509343594, 0.0484452583, 0.0461405367, -0.0309754647, -0.0373595431, 0.0060038008, 0.0610290393, 0.0041283332, -0.0542531572, -0.0191752873, -0.0954154953, 0.0193942357, -0.1054640785, 0.1000249386, 0.0971670821, 0.0171356089, -0.0071676858, -0.0082336199, 0.0357001461, -0.0096683092, 0.0006453222, -0.0469932817, 0.0202239361, -0.0073923962, 0.0346630216, -0.034732163, 0.0151305003, -0.1216893271, -0.0863809809, 0.0531007983, -0.013044727, 0.001554247, -0.0885474235, -0.0393416062, 0.0422916487, -0.0882247612, -0.1682447046, 0.0135863367, -0.0926498249, 0.075917542, -0.0185645372, 0.0281406567, 0.0477999374, -0.031090701, 0.1356098503, -0.0237616841, 0.0286476947, 0.004675705, -0.0067816447, -0.0228282716, 0.0282789394, -0.0330497138, 0.0711237267, -0.0316668823, -0.108690694, 0.0079628145, 0.0866575465, 0.1377301961, 0.0188411027, 0.0163520034, 0.0204198379, 0.0831082761, -0.0254902262, 0.0194172841, -0.1050031409, 0.0463479608, 0.0385349542, 0.1504522562, -0.074672997, 0.0754105076, 0.1143142134, -0.000880836, -0.0156144919, 0.0168705657, -0.0215721987, -0.0448268428, 0.0151881184, -0.0516718701, 0.0558203682, -0.0494132414, 0.0390880853, 0.1465803236, -0.0392263681, -0.0328883827, -0.0227130353, -0.0115869902, -0.0978124067, 0.024061298, -0.0773925707, -0.0950467363, -0.0201317482, -0.0119038895, -0.014761745, -0.0281637032, 0.0011357958, -0.003134422, -0.0436053425, -0.091589652, -0.0323352516, 0.0806191787, -0.028762931, 0.0159717239, -0.0438127667, 0.0883169472, 0.0166746639, -0.075917542, 0.0030076622, 0.0536078364, 0.0358384289, -0.0430291593, 0.0086023752, 0.0957842469, 0.1074922383, 0.0389728509, 0.0456334986, -0.0084237596, 0.0395720787, 0.0849059597, -0.0229665563, 0.0157412514, -0.066790849, -0.0333493277, 0.0551289506, -0.0783144534, -0.1236252934, 0.0140703283, 0.0455182604, -0.0434440114, -0.1156970486, -0.0413236655, 0.0576641448, -0.0491827689, 0.0735206306, 0.0695104152, 0.0050185323, 0.032404393, -0.0729214028, 0.002352257, 0.0728753135, 0.1041734368, -0.0582633726, -0.1075844243, 0.0041024052, 0.0274953339, -0.0520406254, 0.0687729046, 0.0709854364, -0.0456565432, 0.0140357576, -0.033257138, 0.1762651503, 0.037566971, -0.0934334323, 0.0811262205, 0.0342481695, -0.0215606745, -0.0725065544, -0.0562352203, -0.0045201359, -0.0705244988, -0.024314817, 0.0378896296, -0.0230587441, 0.0500585623, -0.0934334323, 0.124362804, -0.0909904242, -0.0938021913, 0.0204428844, 0.0491366759, -0.0572032034, 0.0757792592, 0.0102214422, -0.0108610028, -0.0613517016, -0.0499202795 ]
801.4443
Imran Anwar
Usman Ali
Conjugacy Classes of 3-Braid Group B_3
Changes in the new version are due to: (1) To relate this article to "A note closed 3-braids",preprint, arXiv:0802.1072 by J. S. Birman and W. W. Menasco. (2) Suggestions from Joan Birman to the Author through emails
null
null
null
math.GT math.GR
null
In this article we describe the summit sets in B_3, the smallest element in a summit set and we compute the Hilbert series corresponding to conjugacy classes.The results will be related to Birman-Menesco classification of knots with braid index three or less than three.
[ { "version": "v1", "created": "Tue, 29 Jan 2008 08:07:42 GMT" }, { "version": "v2", "created": "Tue, 18 Mar 2008 12:41:14 GMT" }, { "version": "v3", "created": "Wed, 19 Mar 2008 08:45:06 GMT" } ]
2008-03-19T00:00:00
[ [ "Ali", "Usman", "" ] ]
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801.4444
Hung The Diep
K. Akabli (LPTM), H. T. Diep (LPTM)
Temperature Dependence of the Spin Resistivity in Ferromagnetic Thin Films
11 pages, 18 figures, submitted for publication
PHYS. REV. B 77 (2008) 165433
10.1103/PhysRevB.77.165433
null
cond-mat.mtrl-sci
null
The magnetic phase transition is experimentally known to give rise to an anomalous temperature-dependence of the electron resistivity in ferromagnetic crystals. Phenomenological theories based on the interaction between itinerant electron spins and lattice spins have been suggested to explain these observations. In this paper, we show by extensive Monte Carlo (MC) simulation the behavior of the resistivity of the spin current calculated as a function of temperature ($T$) from low-$T$ ordered phase to high-$T$ paramagnetic phase in a ferromagnetic film. We analyze in particular effects of film thickness, surface interactions and different kinds of impurities on the spin resistivity across the critical region. The origin of the resistivity peak near the phase transition is shown to stem from the existence of magnetic domains in the critical region. We also formulate in this paper a theory based on the Boltzmann's equation in the relaxation-time approximation. This equation can be solved using numerical data obtained by our simulations. We show that our theory is in a good agreement with our MC results. Comparison with experiments is discussed.
[ { "version": "v1", "created": "Tue, 29 Jan 2008 08:50:36 GMT" } ]
2010-05-11T00:00:00
[ [ "Akabli", "K.", "", "LPTM" ], [ "Diep", "H. T.", "", "LPTM" ] ]
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801.4445
Shun Fukushima
S. Fukushima, T. Sato, D. Akahoshi, H. Kuwahara
Comparative study of ordered and disordered Y1-xSrxCoO3-d
3 pages, 3 figures, proceeding of 52nd Mangetism and Magnetic Materials Conference (MMM 2007), published in Journal of Applied Physics
J. Appl. Phys. 103, 07F705 (2008)
10.1063/1.2830615
null
cond-mat.str-el
null
We have succeeded in preparing A-site ordered- and disordered-Y1/4Sr3/4CoO3-d with various oxygen deficiencies delta, and have made comparative study of their structural and physical properties. In the A-site ordered structure, oxygen vacancies order, and d = 0.34 sample shows a weak ferromagnetic transition beyond 300 K. On the other hand, in the A-site disordered structure, no oxygen vacancy ordering is observed, and d = 0.16 sample shows a ferromagnetic metallic transition around 150 K. A-site disordering destroys the orderings of oxygen-vacancies and orbitals, leading to the strong modification of the electronic phases.
[ { "version": "v1", "created": "Tue, 29 Jan 2008 11:22:21 GMT" } ]
2008-01-30T00:00:00
[ [ "Fukushima", "S.", "" ], [ "Sato", "T.", "" ], [ "Akahoshi", "D.", "" ], [ "Kuwahara", "H.", "" ] ]
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801.4446
Alfio Bonanno
A.Bonanno, S.Benatti, R.Claudi, S.Desidera, R.Gratton, S.Leccia, L.Paterno'
Detection of solar-like oscillations in the G5 subgiant mu-Herculis
8 pages, 6 figures, ApJ to appear
null
10.1086/528946
null
astro-ph
null
A clear detection of excess of power, providing a substantial evidence for solar-like oscillations in the G5 subgiant \muher{}, is presented. This star was observed over seven nights with the SARG echelle spectrograph operating with the 3.6-m Italian TNG Telescope, using an iodine absorption cell as a velocity reference. A clear excess of power centered at 1.2 mHz, with peak amplitudes of about 0.9 \ms in the amplitude spectrum is present. Fitting the asymptotic relation to the power spectrum, a mode identification for the $\ell=0,1,2,3$ modes in the frequency range $900-1600 \muHz$ is derived. The most likely value for the large separation turns out to be 56.5 \muHz, consistent with theoretical expectations. The mean amplitude per mode ($l=0,1$) at peak power results to be $0.63 \rm m s^{-1}$, almost three times larger than the solar one.
[ { "version": "v1", "created": "Tue, 29 Jan 2008 09:13:17 GMT" } ]
2009-11-13T00:00:00
[ [ "Bonanno", "A.", "" ], [ "Benatti", "S.", "" ], [ "Claudi", "R.", "" ], [ "Desidera", "S.", "" ], [ "Gratton", "R.", "" ], [ "Leccia", "S.", "" ], [ "Paterno'", "L.", "" ] ]
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801.4447
Sujin Babu
Sujin Babu, Jean-Christophe Gimel, Taco Nicolai
Diffusion limited cluster aggregation with irreversible flexible bonds
12 pages, 13figures
The European Physical Journal E 27 3 (2008) 297-308
null
null
cond-mat.soft
null
Irreversible diffusion limited cluster aggregation (DLCA) of hard spheres was simulated using Brownian cluster dynamics. Bound spheres were allowed to move freely within a specified range, but no bond breaking was allowed. The structure and size distribution of the clusters was investigated before gelation. The pair correlation function and the static structure factor of the gels were determined as a function of the volume fraction and time. Bond flexibility led to local densification of the clusters and the gels, with a certain degree of order. At low volume fractions densification of the clusters occurred during their growth, but at higher volume fractions it occurred mainly after gelation. At very low volume fractions, the large scale structure (fractal dimension), size distribution and growth kinetics of the clusters was found to be close to that known for DLCA with rigid bonds. Restructuring of the gels continued for long times, indicating that aging processes in systems with strong attraction do not necessarily involve bond breaking. The mean square displacement of particles in the gels was determined. It is shown to be highly heterogeneous and to increase with decreasing volume fraction.
[ { "version": "v1", "created": "Tue, 29 Jan 2008 17:00:16 GMT" } ]
2009-03-25T00:00:00
[ [ "Babu", "Sujin", "" ], [ "Gimel", "Jean-Christophe", "" ], [ "Nicolai", "Taco", "" ] ]
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801.4448
Hannah Schunker
H. Schunker, D.C. Braun, C. Lindsey, P.S. Cally
Physical Properties of Wave Motion in Inclined Magnetic Fields Within Sunspot Penumbrae
22 pages, 13 figures
null
10.1007/s11207-008-9142-7
null
astro-ph
null
At the surface of the Sun, acoustic waves appear to be affected by the presence of strong magnetic fields in active regions. We explore the possibility that the inclined magnetic field in sunspot penumbrae may convert primarily vertically propagating acoustic waves into elliptical motion. We use helioseismic holography to measure the modulus and phase of the correlation between incoming acoustic waves and the local surface motion within two sunspots. These correlations are modeled assuming the surface motion is elliptical, and we explore the properties of the elliptical motion on the magnetic field inclination. We also demonstrate that the phase shift of the outward propagating waves is opposite to the phase shift of the inward propagating waves in stronger, more vertical fields, but similar to the inward phase shifts in weaker, more inclined fields.
[ { "version": "v1", "created": "Tue, 29 Jan 2008 09:04:34 GMT" }, { "version": "v2", "created": "Tue, 22 Apr 2008 10:40:33 GMT" } ]
2009-11-13T00:00:00
[ [ "Schunker", "H.", "" ], [ "Braun", "D. C.", "" ], [ "Lindsey", "C.", "" ], [ "Cally", "P. S.", "" ] ]
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801.4449
Yu-Gang Ma
Jiang-Hai Qian and Ding-Ding Han
Gravitation model for spatial network based on the heterogeneous node
6 pages, 8 figures
null
null
null
physics.soc-ph
null
In this paper we consider nodes in network are heterogeneous and the link between nodes is caused by the potential dynamical demand of the nodes. Such demand can be measured by gravitation which increases with the heterogeneous strength of node and decreases with the geographical distance. Based on this, we propose a new model for spatial network from the view of gravitation. The model is to maximize the potential dynamical demand of the whole network, indicating the possible maximal efficiency of the network and the highest profits that operators may gain. The model can vary its topology by changing two parameters. A simulation for the Chinese city airline network is completed. In the end of this article we discuss the significance and advantage of the heterogeneous nodes.
[ { "version": "v1", "created": "Tue, 29 Jan 2008 09:05:07 GMT" } ]
2008-01-30T00:00:00
[ [ "Qian", "Jiang-Hai", "" ], [ "Han", "Ding-Ding", "" ] ]
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801.445
Andrey Aleshin
A. N. Aleshin, I. P. Shcherbakov, E. L. Alexandrova, E. A. Lebedev
Effect of electric field on the photoluminescence of polymer-inorganic nanoparticles composites
5 pages, 5 figures. accepted for publication in Solid State Communications
null
10.1016/j.ssc.2008.01.040
null
cond-mat.soft cond-mat.mtrl-sci
null
We report on the effect of electric field on the photoluminescence, PL, from a composite consisting of a conjugated polymer mixed with zinc oxide nanoparticles. We have found that in the absence of electric field PL emission from the composite film has two maxima in the blue and green-yellow regions. Application of a voltage bias to planar gold electrodes suppresses the green-yellow emission and shifts the only PL emission maximum towards the blue region. Current-voltage characteristics of the polymer-nanoparticles composite exhibit the non-linear behavior typical of non-homogeneous polymer-inorganic structures. Generation of excited states in the composite structure implies the presence of several radiative recombination mechanisms including formation of polymer-nanoparticle complexes including exciplex states and charge transfer between the polymer and nanoparticle that can be controlled by an electric field.
[ { "version": "v1", "created": "Tue, 29 Jan 2008 09:06:47 GMT" } ]
2009-11-13T00:00:00
[ [ "Aleshin", "A. N.", "" ], [ "Shcherbakov", "I. P.", "" ], [ "Alexandrova", "E. L.", "" ], [ "Lebedev", "E. A.", "" ] ]
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801.4451
Manuel Ruiz Marin
O. Broche, E. Jespers, C. Polcino Milies and M. Ruiz
Antisymmetric Elements in Group Rings II
null
null
null
null
math.RA
null
Let $R$ be a commutative ring, $G$ a group and $RG$ its group ring. Let $\vp : RG\to RG$ denote the $R$-linear extension of an involution $\vp$ defined on $G$. An element $x$ in $RG$ is said to be $\vp$-antisymmetric if $\vp (x) = -x$. A characterization is given of when the $\vp$-antisymmetric elements of $RG$ commute. This is a completion of earlier work.
[ { "version": "v1", "created": "Tue, 29 Jan 2008 09:13:26 GMT" } ]
2008-01-30T00:00:00
[ [ "Broche", "O.", "" ], [ "Jespers", "E.", "" ], [ "Milies", "C. Polcino", "" ], [ "Ruiz", "M.", "" ] ]
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801.4452
Carsten Kramer
C. Kramer, R. Moreno, and A. Greve
Long-term observations of Uranus and Neptune at 90 GHz with the IRAM 30m telescope - (1985 -- 2005)
accepted for publication in A&A
null
10.1051/0004-6361:20077705
null
astro-ph
null
The planets Uranus and Neptune with small apparent diameters are primary calibration standards. We investigate their variability at ~90 GHz using archived data taken at the IRAM 30m telescope during the 20 years period 1985 to 2005. We calibrate the planetary observations against non-variable secondary standards (NGC7027, NGC7538, W3OH, K3-50A) observed almost simultaneously. Between 1985 and 2005, the viewing angle of Uranus changed from south-pole to equatorial. We find that the disk brightness temperature declines by almost 10% (~2sigma) over this time span indicating that the south-pole region is significantly brighter than average. Our finding is consistent with recent long-term radio observations at 8.6 GHz by Klein & Hofstadter (2006). Both data sets do moreover show a rapid decrease of the Uranus brightness temperature during the year 1993, indicating a temporal, planetary scale change. We do not find indications for a variation of Neptune's brightness temperature at the 8% level. If Uranus is to be used as calibration source, and if accuracies better than 10% are required, the Uranus sub-earth point latitude needs to be taken into account.
[ { "version": "v1", "created": "Tue, 29 Jan 2008 09:28:31 GMT" } ]
2009-11-13T00:00:00
[ [ "Kramer", "C.", "" ], [ "Moreno", "R.", "" ], [ "Greve", "A.", "" ] ]
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801.4453
Alexander Knebe
Alexander Knebe (AIP) and Chris Power (Leicester)
On the Correlation between Spin Parameter and Halo Mass
7 pages, accepted for publication in ApJ
null
10.1086/586702
null
astro-ph
null
We report on a correlation between virial mass M and spin parameter lambda for dark matter halos forming at redshifts z > 10. We find that the spin parameter decreases with increasing halo mass. Interestingly, our analysis indicates that halos forming at later times do not exhibit such a strong correlation, in agreement with the findings of previous studies. We briefly discuss the implications of this correlation for galaxy formation at high redshifts and the galaxy population we observe today.
[ { "version": "v1", "created": "Tue, 29 Jan 2008 09:23:55 GMT" } ]
2009-11-13T00:00:00
[ [ "Knebe", "Alexander", "", "AIP" ], [ "Power", "Chris", "", "Leicester" ] ]
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801.4454
Fabian Heidrich-Meisner
F. Heidrich-Meisner, M. Rigol, A. Muramatsu, A.E. Feiguin, E. Dagotto
Ground-state reference systems for expanding correlated fermions in one dimension
8 pages Revtex4, 7 eps-figures, minor changes, additional references, as published
Phys. Rev. A 78, 013620 (2008)
10.1103/PhysRevA.78.013620
null
cond-mat.str-el
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the sudden expansion of strongly correlated fermions in a one-dimensional lattice, utilizing the time-dependent density-matrix renormalization group method. Our focus is on the behavior of experimental observables such as the density, the momentum distribution function, and the density and spin structure factors. As our main result, we show that correlations in the transient regime can be accurately described by equilibrium reference systems. In addition, we find that the expansion from a Mott insulator produces distinctive peaks in the momentum distribution function at |k| ~ pi/2, accompanied by the onset of power-law correlations.
[ { "version": "v1", "created": "Tue, 29 Jan 2008 10:17:17 GMT" }, { "version": "v2", "created": "Mon, 28 Apr 2008 15:39:45 GMT" }, { "version": "v3", "created": "Fri, 18 Jul 2008 09:19:51 GMT" } ]
2008-07-18T00:00:00
[ [ "Heidrich-Meisner", "F.", "" ], [ "Rigol", "M.", "" ], [ "Muramatsu", "A.", "" ], [ "Feiguin", "A. E.", "" ], [ "Dagotto", "E.", "" ] ]
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801.4455
Rainer Arlt
R. Arlt
The generation and stability of magnetic fields in CP stars
Contribution presented at the CP/AP Workshop, Vienna, Austria in September 2007
null
null
null
astro-ph
null
A variety of magnetohydrodynamic mechanisms that may play a role in magnetic, chemically peculiar (mCP) stars is reviewed. These involve dynamo mechanisms in laminar flows as well as turbulent environments, and magnetic instabilities of poloidal and toroidal fields as well as combinations of the two. While the proto-stellar phase makes the survival of primordial fields difficult, the variety of magnetic field configurations on mCP stars may be an indication for that they are instability remnants, but there is no process which is clearly superior in explaining the strong fields.
[ { "version": "v1", "created": "Tue, 29 Jan 2008 09:30:06 GMT" } ]
2008-01-30T00:00:00
[ [ "Arlt", "R.", "" ] ]
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801.4456
Norbert Przybilla
N. Przybilla, M. F. Nieva, U. Heber, M. Firnstein, K. Butler, R. Napiwotzki, H. Edelmann
LMC origin of the hyper-velocity star HE 0437-5439. Beyond the supermassive black hole paradigm
4 pages, 3 figures; accepted for publication by Astronomy & Astrophysics
null
10.1051/0004-6361:200809391
null
astro-ph
null
Context: Hyper-velocity stars move so fast that only a supermassive black hole (SMBH) seems to be capable to accelerate them. Hence the Galactic centre (GC) is their only suggested place of origin. Edelmann et al. (2005) found the early B-star HE0437-5439 to be too short-lived to have reached its current position in the Galactic halo if ejected from the GC, except if being a blue straggler. Its proximity to the LMC suggested an origin from this galaxy. Aims: The chemical signatures of stars at the GC are significantly different from those in the LMC. Hence, an accurate measurement of the abundance pattern of HE0437-5439 will yield a new tight constraint on the place of birth of this star. Methods: High-resolution spectra obtained with UVES on the VLT are analysed using state-of-the-art non-LTE modelling techniques. Results: We measured abundances of individual elements to very high accuracy in HE0437-5439 as well as in two reference stars, from the LMC and the solar neighbourhood. The abundance pattern is not consistent at all with that observed in stars near the GC, ruling our an origin from the GC. However, there is a high degree of consistency with the LMC abundance pattern. Our abundance results cannot rule out an origin in the outskirts of the Galactic disk. However, we find the life time of HE0437-5439 to be more than 3 times shorter than the time of flight to the edge of the disk, rendering a Galactic origin unlikely. Conclusions: Only one SMBH is known to be present in Galaxy and none in the LMC. Hence the exclusion of an GC origin challenges the SMBH paradigm. We conclude that there must be other mechanism(s) to accelerate stars to hyper-velocity speed than the SMBH. We draw attention to dynamical ejection from dense massive clusters, that has recently been proposed by Gvaramadze et al. (2008).
[ { "version": "v1", "created": "Tue, 29 Jan 2008 10:20:26 GMT" } ]
2009-11-13T00:00:00
[ [ "Przybilla", "N.", "" ], [ "Nieva", "M. F.", "" ], [ "Heber", "U.", "" ], [ "Firnstein", "M.", "" ], [ "Butler", "K.", "" ], [ "Napiwotzki", "R.", "" ], [ "Edelmann", "H.", "" ] ]
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801.4457
Chethan Gowdigere
R. Fareghbal, C. N. Gowdigere, A. E. Mosaffa, M. M. Sheikh-Jabbari
Nearing Extremal Intersecting Giants and New Decoupled Sectors in N = 4 SYM
44 pages, references added, minor changes
JHEP 0808:070,2008
10.1088/1126-6708/2008/08/070
IPM/P-2008/005, SUT-P-08-1a, IC/2008/003
hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study near-horizon limits of near-extremal charged black hole solutions to five-dimensional $U(1)^3$ gauged supergravity carrying two charges, extending the recent work of Balasubramanian et.al. We show that there are two near-horizon decoupling limits for the near-extremal black holes, one corresponding to the near-BPS case and the other for the far from BPS case. Both of these limits are only defined on the 10d IIB uplift of the 5d black holes, resulting in a decoupled geometry with a six-dimensional part (conformal to) a rotating BTZ X $S^3$. We study various aspects of these decoupling limits both from the gravity side and the dual field theory side. For the latter we argue that there should be two different, but equivalent, dual gauge theory descriptions, one in terms of the 2d CFT's dual to the rotating BTZ and the other as certain large R-charge sectors of d=4,N =4 U(N) SYM theory. We discuss new BMN-type sectors of the N=4 SYM in the $N\to\infty$ limit in which the engineering dimensions scale as $N^{3/2}$ (for the near-BPS case) and as $N^2$ (for the far from BPS case).
[ { "version": "v1", "created": "Tue, 29 Jan 2008 10:22:41 GMT" }, { "version": "v2", "created": "Tue, 15 Apr 2008 13:43:25 GMT" }, { "version": "v3", "created": "Fri, 18 Jul 2008 13:24:16 GMT" } ]
2009-10-07T00:00:00
[ [ "Fareghbal", "R.", "" ], [ "Gowdigere", "C. N.", "" ], [ "Mosaffa", "A. E.", "" ], [ "Sheikh-Jabbari", "M. M.", "" ] ]
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801.4458
Marcel Griesemer
Marcel Griesemer and David Hasler
Analytic Perturbation Theory and Renormalization Analysis of Matter Coupled to Quantized Radiation
47 pages
null
10.1007/s00023-009-0417-9
null
math-ph math.MP math.SP
null
For a large class of quantum mechanical models of matter and radiation we develop an analytic perturbation theory for non-degenerate ground states. This theory is applicable, for example, to models of matter with static nuclei and non-relativistic electrons that are coupled to the UV-cutoff quantized radiation field in the dipole approximation. If the lowest point of the energy spectrum is a non-degenerate eigenvalue of the Hamiltonian, we show that this eigenvalue is an analytic function of the nuclear coordinates and of $\alpha^{3/2}$, $\alpha$ being the fine structure constant. A suitably chosen ground state vector depends analytically on $\alpha^{3/2}$ and it is twice continuously differentiable with respect to the nuclear coordinates.
[ { "version": "v1", "created": "Tue, 29 Jan 2008 09:47:18 GMT" } ]
2015-05-13T00:00:00
[ [ "Griesemer", "Marcel", "" ], [ "Hasler", "David", "" ] ]
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801.4459
Samir Siksek
Y. Bugeaud, M. Mignotte, S. Siksek, M. Stoll and Sz. Tengely
Integral Points on Hyperelliptic Curves
null
Algebra & Number Theory 2 (2008), No. 8, 859-885.
null
null
math.NT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We give a completely explicit upper bound for integral points on (standard) affine models of hyperelliptic curves, provided we know at least one rational point and a Mordell-Weil basis of the Jacobian. We also explain a powerful refinement of the Mordell--Weil sieve which, combined with the upper bound, is capable of determining all the integral points. Our method is illustrated by determining the integral points on a two genus 2 hyperelliptic curves with Mordell--Weil Jacobian ranks of 3 and 6.
[ { "version": "v1", "created": "Tue, 29 Jan 2008 09:48:23 GMT" }, { "version": "v2", "created": "Tue, 1 Jul 2008 08:42:50 GMT" }, { "version": "v3", "created": "Thu, 4 Sep 2008 10:51:58 GMT" }, { "version": "v4", "created": "Tue, 16 Mar 2010 14:43:23 GMT" } ]
2010-03-17T00:00:00
[ [ "Bugeaud", "Y.", "" ], [ "Mignotte", "M.", "" ], [ "Siksek", "S.", "" ], [ "Stoll", "M.", "" ], [ "Tengely", "Sz.", "" ] ]
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801.446
Yuri A. Kordyukov
Bernard Helffer, Yuri A. Kordyukov
Spectral gaps for periodic Schr\"odinger operators with hypersurface magnetic wells
16 pages
null
null
null
math.SP math-ph math.MP
null
We consider a periodic magnetic Schr\"odinger operator on a noncompact Riemannian manifold $M$ such that $H^1(M, \RR)=0$ endowed with a properly discontinuous cocompact isometric action of a discrete group. We assume that there is no electric field and that the magnetic field has a periodic set of compact magnetic wells. We review a general scheme of a proof of existence of an arbitrary large number of gaps in the spectrum of such an operator in the semiclassical limit, which was suggested in our previous paper, and some applications of this scheme. Then we apply these methods to establish similar results in the case when the wells have regular hypersurface pieces.
[ { "version": "v1", "created": "Tue, 29 Jan 2008 10:02:05 GMT" } ]
2008-01-30T00:00:00
[ [ "Helffer", "Bernard", "" ], [ "Kordyukov", "Yuri A.", "" ] ]
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801.4461
C.C. Alan Fung
C. C. Alan Fung, K. Y. Michael Wong, Si Wu
Dynamics of Neural Networks with Continuous Attractors
6 pages, 7 figures with 4 captions
EPL (2008) 84: 18002
10.1209/0295-5075/84/18002
null
cond-mat.dis-nn q-bio.NC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We investigate the dynamics of continuous attractor neural networks (CANNs). Due to the translational invariance of their neuronal interactions, CANNs can hold a continuous family of stationary states. We systematically explore how their neutral stability facilitates the tracking performance of a CANN, which is believed to have wide applications in brain functions. We develop a perturbative approach that utilizes the dominant movement of the network stationary states in the state space. We quantify the distortions of the bump shape during tracking, and study their effects on the tracking performance. Results are obtained on the maximum speed for a moving stimulus to be trackable, and the reaction time to catch up an abrupt change in stimulus.
[ { "version": "v1", "created": "Tue, 29 Jan 2008 10:15:35 GMT" }, { "version": "v2", "created": "Sat, 31 Jan 2015 15:29:22 GMT" } ]
2015-02-03T00:00:00
[ [ "Fung", "C. C. Alan", "" ], [ "Wong", "K. Y. Michael", "" ], [ "Wu", "Si", "" ] ]
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801.4462
Philip Evans
P. A. Evans, A.P. Beardmore, M.R. Goad, J.P. Osborne (U. Leicester), D.N. Burrows (Penn State University), and N. Gehrels (NASA/GSFC)
Improving Swift-XRT positions of GRBs
4 pages, to appear in the proceedings of "Gamma Ray Bursts 2007, Santa Fe"
AIP Conf.Proc.1000:539-542,2008
10.1063/1.2943526
null
astro-ph
null
Since GRBs fade rapidly, it is important to publish accurate, precise positions at early times. For Swift-detected bursts, the best promptly available position is most commonly the X-ray Telescope (XRT) position. We present two processes, developed by the Swift team at Leicester, which are now routinely used to improve the precision and accuracy of the XRT positions reported by the Swift team. Both methods, which are fully automated, make use of a PSF-fitting approach which accounts for the bad columns on the CCD. The first method yields positions with 90% error radii <4.4" 90% of the time, within 10--20 minutes of the trigger. The second method astrometrically corrects the position using UVOT field stars and the known mapping between the XRT and UVOT detectors, yielding enhanced positions with 90% error radii of <2.8" 90% of the time, usually ~2 hours after the trigger.
[ { "version": "v1", "created": "Tue, 29 Jan 2008 10:07:56 GMT" } ]
2010-03-19T00:00:00
[ [ "Evans", "P. A.", "", "U. Leicester" ], [ "Beardmore", "A. P.", "", "U. Leicester" ], [ "Goad", "M. R.", "", "U. Leicester" ], [ "Osborne", "J. P.", "", "U. Leicester" ], [ "Burrows", "D. N.", "", "Penn State University" ], [ "Gehrels", "N.", "", "NASA/GSFC" ] ]
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801.4463
Romuald A. Janik
Michal P. Heller, Romuald A. Janik and Tomasz Lukowski
A new derivation of Luscher F-term and fluctuations around the giant magnon
15 pages, no figures; v2: added assumption on diagonal scattering and a section on generalizations; v3: minor changes, version accepted for publication in JHEP
JHEP 0806:036,2008
10.1088/1126-6708/2008/06/036
null
hep-th
null
In this paper we give a new derivation of the generalized Luscher F-term formula from a summation over quadratic fluctuations around a given soliton. The result is very general providing that S-matrix is diagonal and is valid for arbitrary dispersion relation. We then apply this formalism to compute the leading finite size corrections to the giant magnon dispersion relation coming from quantum fluctuations.
[ { "version": "v1", "created": "Tue, 29 Jan 2008 10:15:36 GMT" }, { "version": "v2", "created": "Thu, 6 Mar 2008 18:58:43 GMT" }, { "version": "v3", "created": "Fri, 23 May 2008 16:23:52 GMT" } ]
2014-11-18T00:00:00
[ [ "Heller", "Michal P.", "" ], [ "Janik", "Romuald A.", "" ], [ "Lukowski", "Tomasz", "" ] ]
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801.4464
Bruno Andreotti
Jacco H. Snoeijer and Bruno Andreotti
A microscopic view on contact angle selection
12 pages, 6 figures
null
10.1063/1.2913675
null
physics.flu-dyn
null
We discuss the equilibrium condition for a liquid that partially wets a solid on the level of intermolecular forces. Using a mean field continuum description, we generalize the capillary pressure from variation of the free energy and show at what length scale the equilibrium contact angle is selected. After recovering Young's law for homogeneous substrates, it is shown how hysteresis of the contact angle can be incorporated in a self-consistent fashion. In all cases the liquid-vapor interface takes a nontrivial shape, which is compared to models using a disjoining pressure.
[ { "version": "v1", "created": "Tue, 29 Jan 2008 10:18:29 GMT" } ]
2009-11-13T00:00:00
[ [ "Snoeijer", "Jacco H.", "" ], [ "Andreotti", "Bruno", "" ] ]
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801.4465
Patricia Whitelock
Patricia A. Whitelock, Michael W. Feast and Floor van Leeuwen
AGB Variables and the Mira Period-Luminosity Relation
15 pages, 3 figures, accepted for MNRAS
Mon.Not.Roy.Astron.Soc.386:313-323,2008
10.1111/j.1365-2966.2008.13032.x
null
astro-ph
null
Published data for large amplitude asymptotic giant branch variables in the Large Magellanic Cloud are re-analysed to establish the constants for an infrared (K) period-luminosity relation of the form: Mk=rho[log P-2.38] + delta. A slope of rho=-3.51+/-0.20 and a zero point of delta=-7.15+/-0.06 are found for oxygen-rich Miras (if a distance modulus of 18.39+/-0.05 is used for the LMC). Assuming this slope is applicable to Galactic Miras we discuss the zero-point for these stars using the revised Hipparcos parallaxes together with published VLBI parallaxes for OH Masers and Miras in Globular Clusters. These result in a mean zero-point of delta=-7.25+/-0.07 for O-rich Galactic Miras. The zero-point for Miras in the Galactic Bulge is not significantly different from this value. Carbon-rich stars are also discussed and provide results that are consistent with the above numbers, but with higher uncertainties. Within the uncertainties there is no evidence for a significant difference between the period-luminosity relation zero-points for systems with different metallicity.
[ { "version": "v1", "created": "Tue, 29 Jan 2008 10:34:43 GMT" } ]
2014-11-18T00:00:00
[ [ "Whitelock", "Patricia A.", "" ], [ "Feast", "Michael W.", "" ], [ "van Leeuwen", "Floor", "" ] ]
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801.4466
Thomas Gasenzer
Alexander Bransch\"adel and Thomas Gasenzer
2PI nonequilibrium versus transport equations for an ultracold Bose gas
24 pages, 7 figures. References added
J.Phys.B41:135302,2008
10.1088/0953-4075/41/13/135302
HD-THEP-08-02
cond-mat.other hep-ph
null
The far-from-equilibrium dynamics of an ultracold, one-dimensional Bose gas is studied. The focus is set on the comparison between the solutions of fully dynamical evolution equations derived from the 2PI effective action and their corresponding kinetic approximation in the form of Boltzmann-type transport equations. It is shown that during the time evolution of the gas a kinetic description which includes non-Markovian memory effects in a gradient expansion becomes valid. The time scale at which this occurs is shown to exceed significantly the time scale at which the system's evolution enters a near-equilibrium drift period where a fluctuation dissipation relation is found to hold and which would seem to be predestined for the kinetic approximation.
[ { "version": "v1", "created": "Tue, 29 Jan 2008 11:39:53 GMT" }, { "version": "v2", "created": "Wed, 20 Feb 2008 10:58:03 GMT" } ]
2008-11-26T00:00:00
[ [ "Branschädel", "Alexander", "" ], [ "Gasenzer", "Thomas", "" ] ]
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801.4467
Gregory Lehaut
Gregory Lehaut, Francesca Gullminelli and Olivier Lopez
Isospin effects in the thermodynamics of finite nuclei
Proceeding of the International Workshop on Multifragmentation and related topics, November 2007 4-7th, Caen France
null
null
null
nucl-th
null
It has been proposed that multifragmentation can be related to the liquid-gas phase transition of nuclear matter. We study the statistical properties of finite nuclear matter near the phase transition with the help of a Lattice Gas Model (LGM). The original version of LGM with only one type of charge-neutral particles is well known to feature the properties of the liquid-gas phase transition. In this contribution, we address the effect of Coulomb and isospin dependence interaction for the finite nuclei transition, and study the symmetry energy properties of finite temperature systems.
[ { "version": "v1", "created": "Tue, 29 Jan 2008 10:50:40 GMT" } ]
2008-01-30T00:00:00
[ [ "Lehaut", "Gregory", "" ], [ "Gullminelli", "Francesca", "" ], [ "Lopez", "Olivier", "" ] ]
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801.4468
Nikolai Chugai
N. N. Chugai
Circumstellar Na I and Ca II lines of type Ia supernovae in symbiotic scenario
10 pages, 6 figures, Astronomy Letters (accepted)
null
10.1134/S1063773708060030
null
astro-ph
null
Formation of circumstellar lines of Na I and Ca II in type Ia supernovae is studied for the case, when supernova explodes in a binary system with a red giant. The model suggests a spherically-symmetric wind and takes into account ionization and heating of the wind by X-rays from the shock wave and by gamma-quanta of ^{56}Ni radioactive decay. For the wind density typical of the red giant the expected optical depth of the wind in Na I lines turnes out too low (\tau<0.001}) to detect the absorption. For the same wind densities the predicted optical depth of Ca II 3934 \AA is sufficient for the detection (\tau>0.1). I conclude that the absorption lines detected in SN 2006X cannot form in the red giant wind; they are rather related to clouds at distances larger than the dust evaporation radius (r>10^{17} cm). From the absence in SN 2006X of Ca II absorption lines not related with the similar Na I components I derive the upper limit of the mass loss rate by the wind with velocity u: \dot{M}<10^{-8}(u/10 km/s) M_{\odot} yr^{-1}.
[ { "version": "v1", "created": "Tue, 29 Jan 2008 10:52:34 GMT" } ]
2009-11-13T00:00:00
[ [ "Chugai", "N. N.", "" ] ]
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801.4469
Michio Naito
O. Matsumoto, A. Utsuki, A. Tsukada, H. Yamamoto, T. Manabe, M. Naito
Superconductivity in undoped T'-RE2CuO4 with Tc over 30 K
17 pages, 5 figures, International Symposium on Superconductivity 2007
null
10.1016/j.physc.2008.05.019
null
cond-mat.supr-con
null
In this article, we report the superconductivity in T'-RE2CuO4 (RE = Pr, Nd, Sm, Eu, and Gd), which have been for a long time believed as a Mott insulator. Our discovery was achieved by using metal-organic decomposition (MOD), an inexpensive and easy-to-implement thin-film process. The keys to prepare the superconducting films are firing with low partial-pressure of oxygen and reduction at low temperatures. The highest Tc of undoped T'-RE2CuO4 is over 30 K, substantially higher than "electron-doped" analogs. Remarkably, Gd2CuO4, even the derivatives of which have not shown superconductivity so far, gets superconducting with Tconset as high as 20 K. The implication of our discovery is briefly discussed.
[ { "version": "v1", "created": "Tue, 29 Jan 2008 10:59:36 GMT" } ]
2009-11-13T00:00:00
[ [ "Matsumoto", "O.", "" ], [ "Utsuki", "A.", "" ], [ "Tsukada", "A.", "" ], [ "Yamamoto", "H.", "" ], [ "Manabe", "T.", "" ], [ "Naito", "M.", "" ] ]
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801.447
Babatunde Okunoye
Babatunde O. Okunoye
Testing for Subcellular Randomness
18 pages,3 figures
null
null
null
physics.gen-ph
null
Statistical tests were conducted on 1,000 numbers generated from the genome of Bacteriophage T4, obtained from GenBank with accession number AF158101.The numbers passed the non-parametric, distribution-free tests.Deoxyribonucleic acid was discovered to be a random number generator, existent in nature.
[ { "version": "v1", "created": "Tue, 29 Jan 2008 10:59:46 GMT" } ]
2008-01-30T00:00:00
[ [ "Okunoye", "Babatunde O.", "" ] ]
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801.4471
Hrvoje Nikolic
H. Nikolic
Unparticle as a particle with arbitrary mass
5 pages, revised, to appear in Mod. Phys. Lett. A
Mod.Phys.Lett.A23:2645-2649,2008
10.1142/S021773230802820X
null
hep-ph hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The unparticle field operator can be expanded in terms of creation and destruction operators corresponding to particles with a continuous mass spectrum. Hence, when the 4-momentum of an unparticle is measured, then the unparticle manifests as an ordinary particle with a definite (but arbitrary) mass.
[ { "version": "v1", "created": "Tue, 29 Jan 2008 11:05:57 GMT" }, { "version": "v2", "created": "Mon, 4 Feb 2008 11:00:19 GMT" }, { "version": "v3", "created": "Tue, 1 Jul 2008 09:38:09 GMT" } ]
2008-11-07T00:00:00
[ [ "Nikolic", "H.", "" ] ]
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801.4472
Riccardo Franco
Riccardo Franco
Belief revision in quantum decision theory: gambler's and hot hand fallacies
null
null
null
null
physics.gen-ph
null
In the present article we introduce a quantum mechanism which is able to describe the creation of correlations in the evaluation of random independent events: such correlations, known as positive and negative recency, correspond respectively to the hot hand's and to the gambler's fallacies. Thus we propose a description of these effects in terms of qubits, which may become entangled, forming a system which can not be described completely only in terms of its constituents. We show that such formalism is able to describe and interpret the experimental results, thus providing a general and unifying framework for the cognitive heuristics.
[ { "version": "v1", "created": "Tue, 29 Jan 2008 11:19:34 GMT" } ]
2008-01-30T00:00:00
[ [ "Franco", "Riccardo", "" ] ]
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