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801.4873
Panos Karageorge
Panos D. Karageorge and Uzy Smilansky
Counting nodal domains on surfaces of revolution
36 pages, 8 figures
null
10.1088/1751-8113/41/20/205102
null
nlin.CD nlin.SI
null
We consider eigenfunctions of the Laplace-Beltrami operator on special surfaces of revolution. For this separable system, the nodal domains of the (real) eigenfunctions form a checker-board pattern, and their number $\nu_n$ is proportional to the product of the angular and the "surface" quantum numbers. Arranging the wave functions by increasing values of the Laplace-Beltrami spectrum, we obtain the nodal sequence, whose statistical properties we study. In particular we investigate the distribution of the normalized counts $\frac{\nu_n}{n}$ for sequences of eigenfunctions with $K \le n\le K + \Delta K$ where $K,\Delta K \in \mathbb{N}$. We show that the distribution approaches a limit as $K,\Delta K\to\infty$ (the classical limit), and study the leading corrections in the semi-classical limit. With this information, we derive the central result of this work: the nodal sequence of a mirror-symmetric surface is sufficient to uniquely determine its shape (modulo scaling).
[ { "version": "v1", "created": "Thu, 31 Jan 2008 14:07:26 GMT" } ]
2009-11-13T00:00:00
[ [ "Karageorge", "Panos D.", "" ], [ "Smilansky", "Uzy", "" ] ]
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801.4874
Bernd Vollmer
B. Vollmer (1), M. Soida (2), A. Chung (3), J.H. van Gorkom (4), K. Otmianowska-Mazur (2), R. Beck (5), M. Urbanik (2), J.D.P. Kenney (6) ((1) CDS, Observatoire de Strasbourg, (2) Astronomical Observatory, Jagiellonian University, Krakow, (3) University of Massachusetts, Amherst, (4) Columbia University, New York, (5) Max-Planck-Institut fuer Radioastronomie, Bonn, (6) Yale University, New Haven)
Pre-peak ram pressure stripping in the Virgo cluster spiral galaxy NGC 4501
22 pages, 25 figures, accepted for publication in A&A
null
10.1051/0004-6361:20078139
null
astro-ph
null
VIVA HI observations of the Virgo spiral galaxy NGC 4501 are presented. The HI disk is sharply truncated to the southwest, well within the stellar disk. A region of low surface-density gas, which is more extended than the main HI disk, is discovered northeast of the galaxy center. These data are compared to existing 6cm polarized radio continuum emission, Halpha, and optical broad band images. We observe a coincidence between the western HI and polarized emission edges, on the one hand, and a faint Halpha emission ridge, on the other. The polarized emission maxima are located within the gaps between the spiral arms and the faint Halpha ridge. Based on the comparison of these observations with a sample of dynamical simulations with different values for maximum ram pressure and different inclination angles between the disk and the orbital plane,we conclude that ram pressure stripping can account for the main observed characteristics. NGC 4501 is stripped nearly edge-on, is heading southwest, and is ~200-300 Myr before peak ram pressure, i.e. its closest approach to M87. The southwestern ridge of enhanced gas surface density and enhanced polarized radio-continuum emission is due to ram pressure compression. It is argued that the faint western Halpha emission ridge is induced by nearly edge-on ram pressure stripping. NGC 4501 represents an especially clear example of early stage ram pressure stripping of a large cluster-spiral galaxy.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 14:20:14 GMT" } ]
2009-11-13T00:00:00
[ [ "Vollmer", "B.", "" ], [ "Soida", "M.", "" ], [ "Chung", "A.", "" ], [ "van Gorkom", "J. H.", "" ], [ "Otmianowska-Mazur", "K.", "" ], [ "Beck", "R.", "" ], [ "Urbanik", "M.", "" ], [ "Kenney", "J. D. P.", "" ] ]
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801.4875
Moo Sung Kim
M. S. Kim, M. C. Bennett, and M. C. Aronson
Yb$_{2}$Pt$_{2}$Pb: Magnetic frustration in the Shastry-Sutherland lattice
8 pages, 8 figures
null
10.1103/PhysRevB.77.144425
null
cond-mat.str-el
null
We have synthesized single crystals of Yb$_{2}$Pt$_{2}$Pb, which crystallize in the layered U$_{2}$Pt$_{2}$Sn-type structure, where planes of Yb ions lie on a triangular network. We report here the first results of magnetization, specific heat, and electrical resistivity experiments. The lattice constants and high temperature magnetic susceptibility indicate that the Yb ions are trivalent, while Schottky peaks in the specific heat show that the ground state is a well isolated doublet. Significant magnetic anisotropy is observed, with the ratio of susceptibilities perpendicular and parallel to the magnetic planes differing by as much as a factor of 30 at the lowest temperatures. Antiferromagnetic order occurs at a N\'eel temperature $T_{\rm N}$=2.07 K, a transition temperature which is more than an order of magnitude smaller than the mean field interactions reflected by the in-plane Weiss temperature. Further evidence for short ranged magnetic fluctuations is found in the magnetic susceptibility and electrical resistivity, which have broad peaks above $T_{\rm N}$, and in the slow development of the magnetic entropy at $T_{\rm N}$. Our experiments indicate that Yb$_{2}$Pt$_{2}$Pb is a quasi-two dimensional and localized moment system, where strong magnetic frustration may arise from the geometry of the underlying Shastry-Sutherland lattice.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 14:17:23 GMT" } ]
2009-11-13T00:00:00
[ [ "Kim", "M. S.", "" ], [ "Bennett", "M. C.", "" ], [ "Aronson", "M. C.", "" ] ]
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801.4876
Shane P. O'Sullivan
Shane P. O'Sullivan, Denise C. Gabuzda
Parsec-scale Investigation of the Magnetic Field Structure of Several AGN Jets
4 pages, 5 figures for the proceedings of 'High Energy Phenomena In Relativistic Outflows' (September 24-28, 2007, Dublin, Ireland)
null
10.1142/S0218271808013145
null
astro-ph
null
Multi-frequency (4.6, 5, 5.5, 8, 8.8, 13, 15, 22 & 43 GHz) polarization observations of 6 "blazars" were obtained on the American Very Long Baseline Array (VLBA) over a 24-hr period on 2 July 2006. Observing at several frequencies, separated by short and long intervals, enabled reliable determination of the distribution of Faraday Rotation on a range of scales. In all cases the magnitude of the RM increases in the higher frequency observations, implying that the electron density and/or magnetic field strength is increasing as we get closer to the central engine. After correcting for Faraday rotation, the polarization orientation in the jet is either parallel or perpendicular to the jet direction. A transverse Rotation Measure (RM) gradient was detected in the jet of 0954+658, providing evidence for the presence of a helical magnetic field surrounding the jet. For three of the sources (0954+658, 1418+546, 2200+420), the sign of the RM in the core region changes in different frequency-intervals, indicating that the line-of-sight component of the magnetic field is changing with distance from the base of the jet. We suggest an explanation for this in terms of bends in a relativistic jet surrounded by a helical magnetic field; where there is no clear evidence for pc-scale bends, the same effect can be explained by an accelerating/decelerating jet.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 14:18:23 GMT" } ]
2009-11-13T00:00:00
[ [ "O'Sullivan", "Shane P.", "" ], [ "Gabuzda", "Denise C.", "" ] ]
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801.4877
Gerald A. Edgar
G. A. Edgar
Transseries for beginners
53 pages
Real Analysis Exchange 35 (2010) 253-310
null
null
math.RA math.CA math.HO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
From the simplest point of view, transseries are a new kind of expansion for real-valued functions. But transseries constitute much more than that--they have a very rich (algebraic, combinatorial, analytic) structure. The set of transseries is a large ordered field, extending the real number field, and endowed with additional operations such as exponential, logarithm, derivative, integral, composition. Over the course of the last 20 years or so, transseries have emerged in several areas of mathematics: asymptotic analysis, model theory, computer algebra, surreal numbers. This paper is an exposition for the non-specialist mathematician. All a mathematician needs to know in order to apply transseries.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 14:20:34 GMT" }, { "version": "v2", "created": "Wed, 30 Apr 2008 14:13:32 GMT" }, { "version": "v3", "created": "Thu, 28 Aug 2008 14:24:28 GMT" }, { "version": "v4", "created": "Wed, 7 Jan 2009 16:04:13 GMT" }, { "version": "v5", "created": "Wed, 15 Jul 2009 12:53:34 GMT" } ]
2010-11-08T00:00:00
[ [ "Edgar", "G. A.", "" ] ]
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801.4878
Hubert Branger
Hubert Branger (IRPHE), Olivier Kimmoun (IRPHE, EGIM), N. Gavrilov (LIH), Valery Liapidevskii (LIH), E. Pavlova (LIH)
Run Up of Surface and Internal Waves
null
International conference on fluxes and structure in fluids, St-Petersburg : Russie (2007)
null
null
physics.class-ph
null
The evolution of breaking waves propagating towards the shore and more specifically the run-up phase over the swash-zone for surface as well as for internal waves is considered. The study is based on a) laboratory run up experiments for surface waves ; b) laboratory stratified flow experiments and c) on field data describing the internal wave run up. The presentation is focused on the breaking and energy transfer mechanisms common to surface and internal waves in the swash-zone. The mathematical model taking into account turbulent mixing and dispersion effects is discussed.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 14:23:22 GMT" } ]
2008-02-01T00:00:00
[ [ "Branger", "Hubert", "", "IRPHE" ], [ "Kimmoun", "Olivier", "", "IRPHE, EGIM" ], [ "Gavrilov", "N.", "", "LIH" ], [ "Liapidevskii", "Valery", "", "LIH" ], [ "Pavlova", "E.", "", "LIH" ] ]
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801.4879
Antonio Mura
Antonio Mura, Gianni Pagnini
Characterizations and simulations of a class of stochastic processes to model anomalous diffusion
25 pages, 9 figures
Journal of Physics A: Math. Theor. Vol. 41 (2008) 285003 (22 pages)
10.1088/1751-8113/41/28/285003
null
math-ph cond-mat.stat-mech math.MP math.PR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper we study a parametric class of stochastic processes to model both fast and slow anomalous diffusion. This class, called generalized grey Brownian motion (ggBm), is made up off self-similar with stationary increments processes (H-sssi) and depends on two real parameters alpha in (0,2) and beta in (0,1]. It includes fractional Brownian motion when alpha in (0,2) and beta=1, and time-fractional diffusion stochastic processes when alpha=beta in (0,1). The latters have marginal probability density function governed by time-fractional diffusion equations of order beta. The ggBm is defined through the explicit construction of the underline probability space. However, in this paper we show that it is possible to define it in an unspecified probability space. For this purpose, we write down explicitly all the finite dimensional probability density functions. Moreover, we provide different ggBm characterizations. The role of the M-Wright function, which is related to the fundamental solution of the time-fractional diffusion equation, emerges as a natural generalization of the Gaussian distribution. Furthermore, we show that ggBm can be represented in terms of the product of a random variable, which is related to the M-Wright function, and an independent fractional Brownian motion. This representation highlights the $H$-{\bf sssi} nature of the ggBm and provides a way to study and simulate the trajectories. For this purpose, we developed a random walk model based on a finite difference approximation of a partial integro-differenital equation of fractional type.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 14:33:01 GMT" }, { "version": "v2", "created": "Tue, 24 Jun 2008 15:42:35 GMT" } ]
2009-11-13T00:00:00
[ [ "Mura", "Antonio", "" ], [ "Pagnini", "Gianni", "" ] ]
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801.488
Jiri Barilla
J. Barilla, M. Lokaj\'i\v{c}ek, P. Simr
Mathematical Model of DSB formation by Ionizing Radiation
14 pages, 1 figure, PDFLaTex
null
null
null
physics.bio-ph physics.med-ph
null
The understanding of inactivation radiobiological mechanism in individual cells is important when from one side the application of ionizing radiation to tumour therapy and from the other side the protection against radiation are to be effectively improved. Important part of this mechanism is double-strand break (DSB) formation; these DSB may be formed directly by impacting ionizing particles or indirectly by different secondary radicals. The latter kind of formation is much more frequent when cells contain normal water content. Mathematical model of the corresponding chemical stage will be presented with the aim to demonstrate how the individual radicals, but also other chemical agents present in the water during irradiation may influence DSB formation.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 15:06:24 GMT" } ]
2008-02-01T00:00:00
[ [ "Barilla", "J.", "" ], [ "Lokajíček", "M.", "" ], [ "Simr", "P.", "" ] ]
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801.4881
Sylvain Maillot
Sylvain Maillot
Some applications of Ricci flow to 3-manifolds
29 pages
null
null
null
math.DG math.GT
null
We decribe and announce some results (joint with G. Besson, L. Bessieres, M. Boileau and J.Porti) about the geometry and topology of 3-manifolds. Most of the article is primarily intended as an introduction for nonexperts to geometrization of 3-manifolds, Ricci flow with surgery, and the simplicial volume approach to collapsing theorems. In the last section, Ricci flow with surgery on open 3-manifolds and obstructions to positive scalar curvature are discussed.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 14:32:27 GMT" } ]
2008-02-01T00:00:00
[ [ "Maillot", "Sylvain", "" ] ]
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801.4882
Hicham El Bouanani
Sergey Dobrokhotov, Michel Rouleux (CPT)
The Semi Classical Maupertuis-Jacobi Correspondance for Quasi-Periodic Hamiltonian Flows
~40 pages
null
null
null
math-ph math.MP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We extend to the semi-classical setting the Maupertuis-Jacobi correspondance for a pair of hamiltonians $(H(x,hD_x), {\cal H}(x,hD_x)$. If ${\cal H}(p,x)$ is completely integrable, or has merely has invariant diohantine torus $\Lambda$ in energy surface ${\cal E}$, then we can construct a family of quasi-modes for $H(x,hD_x)$ at the corresponding energy $E$. This applies in particular to the theory of water-waves in shallow water, and determines trapped modes by an island, from the knowledge of Liouville metrics.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 14:32:43 GMT" }, { "version": "v2", "created": "Thu, 17 Jul 2008 12:27:26 GMT" } ]
2008-07-17T00:00:00
[ [ "Dobrokhotov", "Sergey", "", "CPT" ], [ "Rouleux", "Michel", "", "CPT" ] ]
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801.4883
Edwin Laermann
P. Hegde, F. Karsch, E. Laermann and S. Shcheredin
Lattice cut-off effects and their reduction in studies of QCD thermodynamics at non-zero temperature and chemical potential
19 pages, 7 plots
Eur.Phys.J.C55:423-437,2008
10.1140/epjc/s10052-008-0613-7
null
hep-lat
null
We clarify the relation between the improvement of dispersion relations in the fermion sector of lattice regularized QCD and the improvement of bulk thermodynamic observables. We show that in the infinite temperature limit the cut-off dependence in dispersion relations can be eliminated up to O(a^n) corrections, if the quark propagator is chosen to be rotationally invariant up to this order. In bulk thermodynamic observables this eliminates cut-off effects up to the same order at vanishing as well as non-vanishing chemical potential. We furthermore show, that in the infinite temperature, ideal gas limit the dependence of finite cut-off corrections on the chemical potential is given by Bernoulli polynomials which are universal as they do not depend on a particular discretization scheme. We explicitly calculate leading and next-to-leading order cut-off corrections for some staggered and Wilson fermion type actions and compare these with exact evaluations of the free fermion partition functions. This also includes the chirally invariant overlap and domain wall fermion formulations.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 14:38:01 GMT" } ]
2008-11-26T00:00:00
[ [ "Hegde", "P.", "" ], [ "Karsch", "F.", "" ], [ "Laermann", "E.", "" ], [ "Shcheredin", "S.", "" ] ]
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801.4884
J{\o}rn Olsson B
J. B. Olsson
A theorem on the cores of partitions
9 pages
null
null
null
math.CO
null
If s and t are relatively prime positive integers we show that the s-core of a t-core partition is again a t-core partition
[ { "version": "v1", "created": "Thu, 31 Jan 2008 14:39:52 GMT" } ]
2008-02-01T00:00:00
[ [ "Olsson", "J. B.", "" ] ]
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801.4885
Tomislav Ivek
S. Tomic, S. Dolanski Babic, T. Ivek, T.Vuletic, S.Krca, F. Livolant, R. Podgornik
Short-fragment Na-DNA dilute aqueous solutions: fundamental length scales and screening
Accepted for publication in Europhysics Letters. 5 pages, 4 figures
Europhys. Lett. 81, 68003 (2008)
10.1209/0295-5075/81/68003
null
cond-mat.soft
null
Dielectric spectroscopy is used to investigate fundamental length scales of 146 bp short-fragment (nucleosomal) dilute Na-DNA solutions. Two relaxation modes are detected: the high- and the low-frequency mode. Dependence of the corresponding length scales on the DNA and on the (uni-valent) salt concentration is studied in detail, being different from the case of long, genomic DNA, investigated before. In low added salt regime, the length scale of the high-frequency mode scales as the average separation between DNAs, though it is smaller in absolute magnitude, whereas the length scale of the low-frequency mode is equal to the contour length of DNA. These fundamental length scales in low added salt regime do not depend on whether DNA is in a double stranded or single stranded form. On the other hand, with increasing added salt, the characteristic length scale of low-frequency mode diminishes at low DNA concentrations probably due to dynamical formation of denaturation bubbles and/or fraying in the vicinity of DNA denaturation threshold.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 14:40:36 GMT" } ]
2008-06-02T00:00:00
[ [ "Tomic", "S.", "" ], [ "Babic", "S. Dolanski", "" ], [ "Ivek", "T.", "" ], [ "Vuletic", "T.", "" ], [ "Krca", "S.", "" ], [ "Livolant", "F.", "" ], [ "Podgornik", "R.", "" ] ]
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801.4886
Alexander Thomann
A. U. Thomann, V. B. Geshkenbein, and G. Blatter
The dynamically asymmetric SQUID: M\"unchhausen effect
4 pages, 3 figures, to appear in the VORTEX V proceedings in Physica C
Physica C, 468, 705 (2008)
10.1016/j.physc.2007.11.034
null
cond-mat.supr-con
null
We report on a complex zero-temperature decay channel of a classical object in a metastable state coupled to a quantum degree of freedom. This setting can be realized in a dc-SQUID where both Josephson-junctions have identical critical currents I_c but feature strongly asymmetric dynamical parameters; more precisely, selecting both parameters C and 1/R adequately large for one and small for the other junction makes the first junction behave essentially classical but lets quantum effects be present for the second one. The decay process is initiated by the tunneling of the quantum junction, which distorts the trapping potential of the classical junction; the metastable state of the latter then becomes unstable if the distortion is large enough. We present the dynamical phase diagram of this system providing the dependence of this decay channel on the external bias current I and on the coupling strength between the two junctions, determined by the loop inductance L.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 14:49:45 GMT" } ]
2008-07-04T00:00:00
[ [ "Thomann", "A. U.", "" ], [ "Geshkenbein", "V. B.", "" ], [ "Blatter", "G.", "" ] ]
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801.4887
Giulia Pancheri Dr.
R.M. Godbole (Bangalore), A. Grau (Granada U.), G. Pancheri (INFN Frascati), Y.N. Srivastava (INFN and Perugia U.)
Large rapidity gaps survival probabilities at LHC
6 pages, 2 figures, to be published in the Proceedings of International Symposium on Multiparticle Dynamics 2007, Berkeley 2-9 August 2007
Acta Phys.Polon.Supp.1:651-656,2008
null
LNF-08-2(P) 30 gennaio 2008
hep-ph
null
We calculate the probability of large rapidity gaps in high energy hadronic collisions using a model based on QCD mini-jets and soft gluon emission down into the infrared region. Comparing with other models we find a remarkable agreement among most predictions.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 15:17:19 GMT" } ]
2009-01-16T00:00:00
[ [ "Godbole", "R. M.", "", "Bangalore" ], [ "Grau", "A.", "", "Granada U." ], [ "Pancheri", "G.", "", "INFN\n Frascati" ], [ "Srivastava", "Y. N.", "", "INFN and Perugia U." ] ]
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801.4888
Catherine Bourge
Zhiqing Zhang
New Analysis of SUSY Dark Matter Scenarios at ILC
null
ECONF C0705302:COS05,2007
null
LAL 07-150
hep-ph
null
Applying realistic veto efficiencies for the low angle electromagnetic calorimeter located in the very forward direction of the future international linear collider, we revisited the Standard Model background contributions studied previously in stau analyses with supersymmetrical dark matter scenarios.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 15:17:38 GMT" } ]
2009-02-16T00:00:00
[ [ "Zhang", "Zhiqing", "" ] ]
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801.4889
Szymon Gladysz
Szymon Gladysz, Julian C. Christou, L. William Bradford, Lewis C. Roberts Jr
Temporal variability and statistics of the Strehl ratio in adaptive-optics images
submitted to PASP
The Publications of the Astronomical Society of the Pacific, Volume 120, Issue 872, pp. 1132-1143, 2008
10.1086/592787
null
astro-ph
null
We have investigated the temporal variability and statistics of the "instantaneous" Strehl ratio. The observations were carried out with the 3.63-m AEOS telescope equipped with a high-order adaptive optics system. In this paper Strehl ratio is defined as the peak intensity of a single short exposure. We have also studied the behaviour of the phase variance computed on the reconstructed wavefronts. We tested the Marechal approximation and used it to explain the observed negative skewness of the Strehl ratio distribution. The estimate of the phase variance is shown to fit a three-parameter Gamma distribution model. We show that simple scaling of the reconstructed wavefronts has a large impact on the shape of the Strehl ratio distribution.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 18:37:44 GMT" }, { "version": "v2", "created": "Fri, 7 Mar 2008 16:56:46 GMT" }, { "version": "v3", "created": "Wed, 14 May 2008 16:00:52 GMT" } ]
2009-11-13T00:00:00
[ [ "Gladysz", "Szymon", "" ], [ "Christou", "Julian C.", "" ], [ "Bradford", "L. William", "" ], [ "Roberts", "Lewis C.", "Jr" ] ]
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801.489
Rainer Schicker M
R.Schicker
Low mass diffractive systems at LHC
Talk presented at the conference "New trends in High-Energy Physics" (experiment,phenomenology,theory), Yalta, Crimea, Ukraine, sep 15-22, 2007, 5 pages, 1 figure
null
null
null
hep-ph
null
A rapidity gap trigger for the ALICE detector at the Large Hadron Collider LHC is presented and a few selected physics observables are discussed. First, some properties of double pomeron events are outlined. Second, signatures of the odderon in diffractive J/Psi production is discussed. Third, possible evidence of gluon saturation in the cross section of diffractive heavy quark photoproduction is investigated.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 15:19:03 GMT" } ]
2008-02-01T00:00:00
[ [ "Schicker", "R.", "" ] ]
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801.4891
Larissa Lorenz
Larissa Lorenz
Constraints on brane inflation from WMAP3
4 pages, 2 figures, proceedings of the workshop JGRG 17 (Nagoya, Japan, December 2007)
null
null
null
hep-th astro-ph gr-qc
null
Considerable and ongoing effort is made to identify promising scalar field candidates in string theory to drive a cosmological period of inflation. At stake is the possibility that fundamental string parameters could be encoded in observables such as the CMB perturbation spectrum. In this contribution, we hold a concrete model of string inflation (KKLMMT) up against WMAP3 and discuss the constraints obtained.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 15:21:39 GMT" } ]
2008-02-01T00:00:00
[ [ "Lorenz", "Larissa", "" ] ]
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801.4892
Christian Beck
Mirko Schaefer, Christian Beck
Discrete symmetries of chaotic strings
19 pages, 2 figures
null
null
null
nlin.CD hep-th
null
Chaotic strings are particular classes of coupled map lattices that can serve as models for vacuum fluctuations in stochastically quantized field theories. They have been previously shown to distinguish standard model coupling parameters as corresponding to states of strongest possible chaotic behaviour and vanishing nearest-neighbour correlation. In this paper we look at discrete symmetry transformations for chaotic strings. We show that several of the chaotic string dynamics can be transformed into each other by simple discrete coordinate transformations. We investigate how expectation values converge in the various coupling parameter regions and single out those stable zeros of the correlation function that correspond to ergodic states with well-defined convergence properties.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 15:26:17 GMT" } ]
2008-02-13T00:00:00
[ [ "Schaefer", "Mirko", "" ], [ "Beck", "Christian", "" ] ]
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801.4893
Mario Sigalotti
Thomas Chambrion (IECN, Inria Lorraine / Iecn / Mmas), Paolo Mason (IECN, Inria Lorraine / Iecn / Mmas), Mario Sigalotti (IECN, Inria Lorraine / Iecn / Mmas), Ugo Boscain (SISSA, Le2i)
Controllability of the discrete-spectrum Schrodinger equation driven by an external field
null
Annales de l'Institut Henri Poincar\'e Analyse non lin\'eaire (2009) vol. 26, pp. 329-349
10.1016/j.anihpc.2008.05.001
null
math.OC math.AP quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We prove approximate controllability of the bilinear Schr\"odinger equation in the case in which the uncontrolled Hamiltonian has discrete non-resonant spectrum. The results that are obtained apply both to bounded or unbounded domains and to the case in which the control potential is bounded or unbounded. The method relies on finite-dimensional techniques applied to the Galerkin approximations and permits, in addition, to get some controllability properties for the density matrix. Two examples are presented: the harmonic oscillator and the 3D well of potential, both controlled by suitable potentials.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 15:28:34 GMT" }, { "version": "v2", "created": "Tue, 20 May 2008 17:01:30 GMT" }, { "version": "v3", "created": "Wed, 9 Jul 2008 14:15:02 GMT" } ]
2015-05-13T00:00:00
[ [ "Chambrion", "Thomas", "", "IECN, Inria Lorraine / Iecn / Mmas" ], [ "Mason", "Paolo", "", "IECN, Inria Lorraine / Iecn / Mmas" ], [ "Sigalotti", "Mario", "", "IECN, Inria Lorraine /\n Iecn / Mmas" ], [ "Boscain", "Ugo", "", "SISSA, Le2i" ] ]
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801.4894
Daniel Bramich
D.M. Bramich, S. Vidrih, L. Wyrzykowski, J.A. Munn, H. Lin, N.W. Evans, M.C. Smith, V. Belokurov, G. Gilmore, D.B. Zucker, P.C. Hewett, L.L. Watkins, D.C. Faria, M. Fellhauer, G. Miknaitis, D. Bizyaev, Z. Ivezic, D.P. Schneider, S.A. Snedden, E. Malanushenko, V. Malanushenko, K. Pan
Light and Motion in SDSS Stripe 82: The Catalogues
MNRAS accepted
Mon.Not.Roy.Astron.Soc.386:887-902,2008
10.1111/j.1365-2966.2008.13053.x
null
astro-ph
null
We present a new public archive of light-motion curves in Sloan Digital Sky Survey (SDSS) Stripe 82, covering 99 deg in right ascension from RA = 20.7 h to 3.3 h and spanning 2.52 deg in declination from Dec = -1.26 to 1.26 deg, for a total sky area of ~249 sq deg. Stripe 82 has been repeatedly monitored in the u, g, r, i and z bands over a seven-year baseline. Objects are cross-matched between runs, taking into account the effects of any proper motion. The resulting catalogue contains almost 4 million light-motion curves of stellar objects and galaxies. The photometry are recalibrated to correct for varying photometric zeropoints, achieving ~20 mmag and ~30 mmag root-mean-square (RMS) accuracy down to 18 mag in the g, r, i and z bands for point sources and extended sources, respectively. The astrometry are recalibrated to correct for inherent systematic errors in the SDSS astrometric solutions, achieving ~32 mas and ~35 mas RMS accuracy down to 18 mag for point sources and extended sources, respectively. For each light-motion curve, 229 photometric and astrometric quantities are derived and stored in a higher-level catalogue. On the photometric side, these include mean exponential and PSF magnitudes along with uncertainties, RMS scatter, chi^2 per degree of freedom, various magnitude distribution percentiles, object type (stellar or galaxy), and eclipse, Stetson and Vidrih variability indices. On the astrometric side, these quantities include mean positions, proper motions as well as their uncertainties and chi^2 per degree of freedom. The here presented light-motion curve catalogue is complete down to r~21.5 and is at present the deepest large-area photometric and astrometric variability catalogue available.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 15:28:55 GMT" } ]
2008-11-26T00:00:00
[ [ "Bramich", "D. M.", "" ], [ "Vidrih", "S.", "" ], [ "Wyrzykowski", "L.", "" ], [ "Munn", "J. A.", "" ], [ "Lin", "H.", "" ], [ "Evans", "N. W.", "" ], [ "Smith", "M. C.", "" ], [ "Belokurov", "V.", "" ], [ "Gilmore", "G.", "" ], [ "Zucker", "D. B.", "" ], [ "Hewett", "P. C.", "" ], [ "Watkins", "L. L.", "" ], [ "Faria", "D. C.", "" ], [ "Fellhauer", "M.", "" ], [ "Miknaitis", "G.", "" ], [ "Bizyaev", "D.", "" ], [ "Ivezic", "Z.", "" ], [ "Schneider", "D. P.", "" ], [ "Snedden", "S. A.", "" ], [ "Malanushenko", "E.", "" ], [ "Malanushenko", "V.", "" ], [ "Pan", "K.", "" ] ]
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801.4895
Mehrdad Adibzadeh
Mehrdad Adibzadeh and P. Q. Hung
The relic density of shadow dark matter candidates
Revised version after acceptance in NPB
Nucl.Phys.B804:223-249,2008
10.1016/j.nuclphysb.2008.06.015
null
astro-ph hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present the results of relic density calculations for cold dark matter candidates coming from a model of dark energy and dark matter, which is described by an asymptotically free gauge group SU(2)_Z (QZD) with a coupling constant alpha_Z ~ 1 at very low scale of Lambda_Z ~ 10^(-3) eV while alpha_Z ~ weak coupling at high energies. The dark matter candidates of QZD are two fermions in the form of weakly interacting massive particles. Our results show that for masses between 50 and 285 GeV, they can account for either a considerable fraction or the entire dark matter of the Universe.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 16:58:21 GMT" }, { "version": "v2", "created": "Mon, 23 Jun 2008 13:15:19 GMT" } ]
2009-06-23T00:00:00
[ [ "Adibzadeh", "Mehrdad", "" ], [ "Hung", "P. Q.", "" ] ]
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801.4896
Vladimir Gudkov
V. Gudkov
Asymmetry of recoil protons in neutron beta-decay
null
Phys.Rev.C77:045502,2008
10.1103/PhysRevC.77.045502
null
hep-ph
null
A complete analysis of proton recoil asymmetry in neutron decay in the first order of radiative and recoil corrections is presented. The possible contributions from new physics are calculated in terms of low energy coupling constants, and the sensitivity of the measured asymmetry to models beyond the Standard model are discussed.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 15:34:34 GMT" } ]
2008-11-26T00:00:00
[ [ "Gudkov", "V.", "" ] ]
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801.4897
Shane P. O'Sullivan
Shane P. O'Sullivan, Denise C. Gabuzda
The Need For High Resolution In Studies Of The 3-D Magnetic Field Structure Of AGN Jets
4 pages, 1 figure for the proceedings of 'Approaching Micro-Arcsecond Resolution with VSOP-2: Astrophysics and Technology' (3-7 December 2007, ISAS/JAXA, Sagamihara, Japan)
null
null
null
astro-ph
null
We are using "broadband" (4.6 to 43 GHz) multi-frequency VLBA polarization observations of compact AGN to investigate the 3-D structure of their jet magnetic (B) fields. Observing at several frequencies, separated by short and long intervals, enables reliable determination of the distribution of Faraday Rotation, and thereby the intrinsic B field structure. Transverse Rotation Measure (RM) gradients were detected in the jets of 0954+658 and 1418+546, providing evidence for the presence of a helical B field surrounding the jet. The RM in the core regions of 2200+420 (BL Lac), 0954+658 and 1418+546 display different signs in different frequency-intervals (on different spatial scales); we suggest an explanation for this in terms of modest bends in a helical B field surrounding their jets. In future, polarization observations with a combination of VSOP-2 at 8, 22 and 43 GHz and ground arrays at frequencies with corresponding resolution will help map out the distributions of Faraday rotation, spectral index and the 3-D B field structure both across the jet and closer to the central engine, providing strong constraints for any jet B field models.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 15:36:30 GMT" } ]
2008-02-01T00:00:00
[ [ "O'Sullivan", "Shane P.", "" ], [ "Gabuzda", "Denise C.", "" ] ]
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801.4898
Marta Prada
M. Prada, R.H. Blick, and R. Joynt
Singlet-Triplet Relaxation in Two-electron Silicon Quantum Dots
5 pages, 3 figures
null
10.1103/PhysRevB.77.115438
null
cond-mat.other
null
We investigate the singlet-triplet relaxation process of a two electron silicon quantum dot. In the absence of a perpendicular magnetic field, we find that spin-orbit coupling is not the main source of singlet-triplet relaxation. Relaxation in this regime occurs mainly via virtual states and is due to nuclear hyperfine coupling. In the presence of an external magnetic field perpendicular to the plane of the dot, the spin-orbit coupling is important and virtual states are not required. We find that there can be strong anisotropy for different field directions: parallel magnetic field can increase substantially the relaxation time due to Zeeman splitting, but when the magnetic field is applied perpendicular to the plane, the enhancement of the spin-orbit effect shortens the relaxation time. We find the relaxation to be orders of magnitude longer than for GaAs quantum dots, due to weaker hyperfine and spin-orbit effects.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 15:36:54 GMT" } ]
2009-11-13T00:00:00
[ [ "Prada", "M.", "" ], [ "Blick", "R. H.", "" ], [ "Joynt", "R.", "" ] ]
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801.4899
Kevin Zumbrun
Shantia Yarahmadian and Kevin Zumbrun
Pointwise Green function bounds and long-time stability of large-amplitude noncharacteristic boundary layers
33 pp
null
null
null
math.AP
null
Using pointwise semigroup techniques of Zumbrun--Howard and Mascia--Zumbrun, we obtain sharp global pointwise Green function bounds for noncharacteristic boundary layers of arbitrary amplitude. These estimates allow us to analyze linearized and nonlinearized stability of noncharacteristic boundary layers of one-dimensional systems of conservation laws, showing that both are equivalent to a numerically checkable Evans function condition. Our results extend to the large-amplitude case results obtained for small amplitudes by Matsumura, Nishihara and others using energy estimates.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 15:46:05 GMT" } ]
2008-02-01T00:00:00
[ [ "Yarahmadian", "Shantia", "" ], [ "Zumbrun", "Kevin", "" ] ]
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801.49
Baruch Meerson
Alex Kamenev and Baruch Meerson
Extinction of an infectious disease: a large fluctuation in a non-equilibrium system
4 pages
Phys. Rev. E 77, 061107 (2008)
10.1103/PhysRevE.77.061107
null
cond-mat.stat-mech q-bio.PE
null
We develop a theory of first passage processes in stochastic non-equilibrium systems of birth-death type using two closely related epidemiological models as examples. Our method employs the probability generating function technique in conjunction with the eikonal approximation. In this way the problem is reduced to finding the optimal path to extinction: a heteroclinic trajectory of an effective multi-dimensional classical Hamiltonian system. We compute this trajectory and mean extinction time of the disease numerically and uncover a non-monotone, spiral path to extinction of a disease. We also obtain analytical results close to a bifurcation point, where the problem is described by a Hamiltonian previously identified in one-species population models.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 15:39:10 GMT" }, { "version": "v2", "created": "Wed, 2 Apr 2008 13:10:27 GMT" } ]
2014-08-06T00:00:00
[ [ "Kamenev", "Alex", "" ], [ "Meerson", "Baruch", "" ] ]
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801.4901
Alex Carciofi C
A. C. Carciofi, A. Domiciano de Souza, A. M. Magalhaes, J. E. Bjorkman, F. Vakili
On the Determination of the Rotational Oblateness of Achernar
4 pages, 2 figures. Accepted to ApJ Letters
null
10.1086/586895
null
astro-ph
null
The recent interferometric study of Achernar, leading to the conclusion that its geometrical oblateness cannot be explained in the Roche approximation, has stirred substantial interest in the community, in view of its potential impact in many fields of stellar astrophysics. It is the purpose of this paper to reinterpret the interferometric observations with a fast rotating, gravity darkened central star surrounded by a small equatorial disk, whose presence is consistent with contemporaneous spectroscopic data. We find that we can only fit the available data assuming a critically rotating central star. We identified two different disk models that simultaneously fit the spectroscopic, polarimetric, and interferometric observational constraints: a tenuous disk in hydrostatic equilibrium (i.e., with small scaleheight) and a smaller, scaleheight enhanced disk. We believe that these relatively small disks correspond to the transition region between the photosphere and the circumstellar environment, and that they are probably perturbed by some photospheric mechanism. The study of this interface between photosphere and circumstellar disk for near-critical rotators is crucial to our understanding of the Be phenomenon, and the mass and angular momentum loss of stars in general. This work shows that it is nowadays possible to directly study this transition region from simultaneous multi-technique observations.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 15:42:36 GMT" } ]
2009-11-13T00:00:00
[ [ "Carciofi", "A. C.", "" ], [ "de Souza", "A. Domiciano", "" ], [ "Magalhaes", "A. M.", "" ], [ "Bjorkman", "J. E.", "" ], [ "Vakili", "F.", "" ] ]
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801.4902
Mark Dykman
Mark Dykman, Ira B. Schwartz, and Alexandra S. Landsman
Disease extinction in the presence of non-Gaussian noise
Accepted for publication to PRL
null
10.1103/PhysRevLett.101.078101
null
physics.bio-ph cond-mat.stat-mech q-bio.PE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We investigate stochastic extinction in an epidemic model and the impact of random vaccinations in large populations. We show that, in the absence of vaccinations, the effective entropic barrier for extinction displays scaling with the distance to the bifurcation point, with an unusual critical exponent. Even a comparatively weak Poisson-distributed vaccination leads to an exponential increase in the extinction rate, with the exponent that strongly depends on the vaccination parameters.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 15:44:49 GMT" }, { "version": "v2", "created": "Sat, 21 Jun 2008 22:05:37 GMT" } ]
2009-11-13T00:00:00
[ [ "Dykman", "Mark", "" ], [ "Schwartz", "Ira B.", "" ], [ "Landsman", "Alexandra S.", "" ] ]
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801.4903
Benjamin D. G. Chandran
Benjamin D. G. Chandran
Strong Anisotropic MHD Turbulence with Cross Helicity
30 pages, 5 figures, accepted for publication in ApJ
null
10.1086/589432
null
astro-ph
null
This paper proposes a new phenomenology for strong incompressible MHD turbulence with nonzero cross helicity. This phenomenology is then developed into a quantitative Fokker-Planck model that describes the time evolution of the anisotropic power spectra of the fluctuations propagating parallel and anti-parallel to the background magnetic field. It is found that in steady state the power spectra of the magnetic field and total energy are steeper than a Kolmogorov spectrum and become increasingly steep as C/E increases, where C is the cross helicity and E is the fluctuation energy. Increasing C with fixed E increases the time required for energy to cascade to smaller scales, reduces the cascade power, and increases the anisotropy of the small-scale fluctuations. The implications of these results for the solar wind and solar corona are discussed in some detail.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 17:57:24 GMT" } ]
2009-11-13T00:00:00
[ [ "Chandran", "Benjamin D. G.", "" ] ]
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801.4904
Jason Ulery
Jason Glyndwr Ulery
Two- and Three-Particle Jet-Like Correlations
Ph.D. Thesis submitted to Purdue University. Some plots replotted to reduce size. Original version at http://amdahl.physics.purdue.edu/~ulery/Thesis/thesis_submit.pdf
null
null
null
nucl-ex
null
We present results of 2-particle jet-like correlations, with high pT h+- triggers and identified pi+-, p, and pbar triggers in d+Au and Au+Au collisions and 3-particle jet-like azimuthal correlations in pp, d+Au, and Au+Au collisions at sqrt(s)=200 GeV. These results use data from the STAR TPC during RHIC runs II, III, and IV. Modifications in 2-particle correlations are observed in Au+Au collisions. These modifications are not seen in $pp$ or d+Au collisions. This demonstrates that the modifications are due to final state nuclear effects. High pT protons, anti-protons and charged pions are identified by the relativistic rise of dE/dx in the STAR TPC. Correlations of charged hadrons with high pT p, pbar, and pi+- show no discernible difference. The results post challenges to recombination and coalescence models which are otherwise very successful in explaining the large baryon/meson ratio and the splitting of the elliptic flow at intermediate pT. In central Au+Au collisions, the away-side 2-particle correlation is significantly broadened and even double humped in selective kinematic ranges. Three-particle correlations were employed to identify the underlying physics mechanism(s). Results in pp, d+Au and peripheral Au+Au collisions show dijet structure with away-side kT broadening. Results in mid-central and central Au+Au collisions are consistent with a near-side jet and on the away-side a combination of conical emission and large angle gluon radiation and deflected jets. The associated pT independent emission angle suggests Mach-cone shock waves being the underlying physics mechanism for the conical emission. The emission angle is measured to be 1.39+-0.01 (stat.)+-0.04(sys.) in ZDC triggered 0-12% Au+Au data.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 15:55:24 GMT" }, { "version": "v2", "created": "Mon, 18 Feb 2008 14:04:40 GMT" } ]
2008-02-18T00:00:00
[ [ "Ulery", "Jason Glyndwr", "" ] ]
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801.4905
Catherine Bourge
Zhiqing Zhang
Muon g-2: a mini review
null
null
null
LAL 07-88
hep-ph
null
The current status of the experimental measurements and theoretical predictions of the anomalous magnetic moment of the muon $a_\mu$ is briefly reviewed. The emphasis is put on the evaluation of the hadronic contribution to $a_\mu$ as it has the largest uncertainty among all Standard Model contributions. The precision of the hadronic contribution is driven by the input e+e- data predominantly from the \pi+pi- channel. Including the latest experimental data on e+e- annihilation into hadronsfrom CMD2 and SND for the \pi+\pi- channel and BaBar for multihadron final states, the updated Standard Model prediction disagrees with the measurement dominated by BNL by 3.3 standard deviations, with the theoretical precision exceeding the experimental one.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 15:56:45 GMT" } ]
2008-02-01T00:00:00
[ [ "Zhang", "Zhiqing", "" ] ]
[ 0.0411135778, 0.0038787506, -0.0301326383, -0.0153733129, -0.0881781131, 0.1020164564, -0.0099713998, 0.1232698858, 0.0615877137, -0.0303924028, -0.0200372599, 0.0302743278, -0.1284651607, 0.04486835, -0.0043746638, 0.0822271556, -0.1018275395, -0.0481508225, 0.0479855165, 0.0067066373, -0.0477021374, -0.0187974758, 0.0717893615, 0.0236739572, -0.0242761374, -0.0941762999, 0.0020485944, 0.0363433622, -0.003934836, -0.0559673607, 0.122797586, -0.0196003839, -0.0197420735, -0.0894533172, -0.0994660482, 0.1333770752, -0.0104141794, -0.0001863365, -0.0432861485, 0.0012205961, -0.0448447354, -0.0215604231, -0.0012840613, 0.0229064729, 0.0643742755, -0.0103964685, 0.0166367106, -0.0502053201, -0.0410663448, -0.0078755757, -0.0507720783, -0.0120908394, 0.0079936506, -0.0091330707, -0.0237802248, -0.0440182127, 0.1050391644, -0.0127756717, 0.0562035106, -0.0384687036, -0.158786729, -0.0983325318, -0.0130944736, 0.0444905087, -0.0466866978, -0.0709392205, 0.0313133858, 0.1096676886, 0.0614460222, -0.1166577041, 0.0574787147, -0.026495941, 0.0605486557, 0.001926092, -0.0087906541, -0.0074505075, -0.0272043888, -0.0366267413, -0.071364291, 0.0356585309, -0.0649410337, 0.0237920322, -0.0423651673, -0.0610209554, -0.0131653184, 0.0618710928, 0.0040735737, 0.0228474364, -0.0228238199, 0.0178764947, -0.0128465164, -0.0997494236, 0.0087020984, 0.0528501906, 0.0713170618, -0.0505831577, 0.0485995077, -0.0403578989, 0.0316912234, 0.0949792117, -0.0670191422, -0.0096939253, 0.0042359265, -0.1038111895, 0.1307321936, -0.0377130285, 0.0011069494, -0.0182425268, -0.0895005465, 0.0313133858, 0.1010718569, -0.0221507959, -0.1104233712, 0.0077397902, -0.0938456953, -0.0335095711, 0.0069427867, -0.0199664161, 0.0414678007, 0.0741980821, -0.0274877679, 0.0982380658, 0.1322435588, -0.0385395512, 0.0508665368, -0.0854387805, -0.0272988472, -0.0474896058, -0.0547393858, 0.0498274826, 0.0600763559, 0.0335095711, 0.0262834057, -0.0910591334, -0.0003739644, 0.0556367524, 0.0166721344, -0.0867612138, -0.0767484903, 0.0048381067, 0.0564868897, -0.0048764809, -0.0139328027, 0.0655550212, 0.0199073777, 0.0242289081, -0.0017740709, 0.0092157228, 0.0831717476, 0.0304160174, -0.0018936214, 0.0070136315, -0.033226192, -0.0428610817, -0.0454587229, -0.0261181016, -0.0037104944, 0.0102252606, -0.0183960237, -0.1045668647, 0.074906528, 0.0458129458, -0.0549755357, -0.0700418502, 0.1227031276, 0.1429174989, -0.1568030715, -0.0446794294, -0.0830300599, -0.193831265, 0.0316676088, -0.023945529, -0.029164426, -0.0273460783, 0.0525195822, 0.0378783308, -0.0380200222, -0.0651771799, -0.1137294546, 0.0549283065, 0.032871969, 0.0122207217, 0.038445089, 0.0087611359, -0.0610681847, -0.0103610465, 0.000148608, 0.008288837, -0.0151253566, -0.0826522186, -0.0024515239, 0.1504742652, 0.0912008211, 0.0987103656, -0.0320454463, -0.0799128935, 0.040475972, 0.076890178, 0.0652716383, -0.0168610532, -0.0051628118, 0.0242052935, 0.1371554583, -0.1394224912, -0.0395549908, 0.0481035933, 0.1218529865, -0.0654605627, -0.0754732862, 0.0132007403, 0.0355404541, -0.0244178269, 0.0773624778, -0.019163508, -0.0386340097, -0.0303451736, -0.1701218933, 0.0601708181, -0.0348083936, 0.0780709237, -0.0290935822, 0.0886504129, 0.0521889739, 0.1697440445, -0.0710336789, 0.0280545261, 0.087941967, -0.0379255638, 0.0344777852, 0.0545976944, 0.0480091348, 0.0388465449, -0.0331317335, -0.0071139946, -0.0307230111, -0.0288102031, 0.082321614, 0.0481508225, -0.038610395, -0.0390590765, 0.0241580643, -0.0203324463, 0.0022803158, 0.086902909, -0.0798656642, 0.0343360938, 0.0218910314, -0.0091684926, 0.153780356, -0.0022094711, 0.0040381514, 0.067302525, -0.0239573363, -0.0170263574, -0.032234367, -0.0551644526 ]
801.4906
Christophe Morisset
C. Morisset and G. Stasinska
An atlas of synthetic line profiles of planetary nebulae
11 pages, accepted in Revista Mexicana de Astronomia y Astrofisica
null
null
null
astro-ph
null
We have constructed a grid of photoionization models of spherical, elliptical and bipolar planetary nebulae. Assuming different velocity fields, we have computed line profiles corresponding to different orientations, slit sizes and positions. The atlas is meant both for didactic purposes and for the interpretation of data on real nebulae. As an application, we have shown that line profiles are often degenerate, and that recovering the geometry and velocity field from observations requires lines from ions with different masses and different ionization potentials. We have also shown that the empirical way to measure mass-weighted expansion velocities from observed line widths is reasonably accurate if considering the HWHM. For distant nebulae, entirely covered by the slit, the unknown geometry and orientation do not alter the measured velocities statistically. The atlas is freely accessible from internet. The Cloudy_3D suite and the associated VISNEB tool are available on request.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 15:58:37 GMT" } ]
2008-02-01T00:00:00
[ [ "Morisset", "C.", "" ], [ "Stasinska", "G.", "" ] ]
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801.4907
Igor Samsonov
I.L. Buchbinder, I.B. Samsonov
N=3 Superparticle Model
1+31 pages; minor mistakes are corrected, reference added, published version
Nucl.Phys.B802:180-207,2008
10.1016/j.nuclphysb.2008.05.014
null
hep-th
null
We consider the formulation and quantization of the N=3 superparticle model, both with and without central charge. Without the central charge the action possesses U(3) invariance and therefore is naturally quantized in the N=3 harmonic superspace. The quantization reproduces the N=3 supergauge strength multiplets, described by analytic N=3 superfields and a gravitino multiplet as a constrained N=3 chiral superfield. When the central charge is present, it breaks the U(3) R-symmetry of N=3 superalgebra down to SU(2)xU(1), and the corresponding superparticle model is formulated in the N=2 harmonic superspace extended by a pair of extra Grassmann variables. The quantization of such a model leads to the massive BPS N=3 vector multiplet. It is shown that upon additional superfield constraints such multiplet reduces to the massive N=2 vector multiplet.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 15:59:38 GMT" }, { "version": "v2", "created": "Tue, 12 Feb 2008 12:14:30 GMT" }, { "version": "v3", "created": "Sat, 24 May 2008 13:48:04 GMT" }, { "version": "v4", "created": "Wed, 4 Jun 2008 14:58:23 GMT" } ]
2008-11-26T00:00:00
[ [ "Buchbinder", "I. L.", "" ], [ "Samsonov", "I. B.", "" ] ]
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801.4908
Catherine Bourge
Zhiqing Zhang (for the H1 and ZEUS Collaborations)
Electroweak results from HERA
null
J.Phys.Conf.Ser.110:042034,2008
10.1088/1742-6596/110/4/042034
LAL 07-151
hep-ph
null
The inclusive neutral and charged current deep inelastic scattering processes at high Q2 provide the main basis for electroweak studies at HERA. These studies include the determination of the W boson propagator mass and weak neutral current couplings of light quarks to the Z0 boson. The polarised electron or positron beam at HERA II gives rise to additional sensitivities for these studies. Exceptions also exist; this is the case for the single W production.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 16:05:37 GMT" } ]
2019-08-14T00:00:00
[ [ "Zhang", "Zhiqing", "", "for the H1 and ZEUS Collaborations" ] ]
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801.4909
Andrea Trombettoni
A. Smerzi and A. Trombettoni
Optical Lattices: Theory
Chapter 13 in Part VIII: "Optical Lattices" of "Emergent Nonlinear Phenomena in Bose-Einstein Condensates: Theory and Experiment," edited by P. G. Kevrekidis, D. J. Frantzeskakis, and R. Carretero-Gonzalez (Springer Series on Atomic, Optical, and Plasma Physics, 2007) - pages 247-265
null
10.1007/978-3-540-73591-5_13
null
cond-mat.stat-mech
null
This chapter presents an overview of the properties of a Bose-Einstein condensate (BEC) trapped in a periodic potential. This system has attracted a wide interest in the last years, and a few excellent reviews of the field have already appeared in the literature (see, for instance, [1-3] and references therein). For this reason, and because of the huge amount of published results, we do not pretend here to be comprehensive, but we will be content to provide a flavor of the richness of this subject, together with some useful references. On the other hand, there are good reasons for our effort. Probably, the most significant is that BEC in periodic potentials is a truly interdisciplinary problem, with obvious connections with electrons in crystal lattices, polarons and photons in optical fibers. Moreover, the BEC experimentalists have reached such a high level of accuracy to create in the lab, so to speak, paradigmatic Hamiltonians, which were first introduced as idealized theoretical models to study, among others, dynamical instabilities or quantum phase transitions.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 16:05:45 GMT" } ]
2015-05-13T00:00:00
[ [ "Smerzi", "A.", "" ], [ "Trombettoni", "A.", "" ] ]
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801.491
Sam Dolan Dr
M. Casals, S. R. Dolan, P. Kanti and E. Winstanley
Bulk emission of scalars by a rotating black hole
31 pages, 14 figures, minor changes, published in JHEP
JHEP 0806:071,2008
10.1088/1126-6708/2008/06/071
null
hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study in detail the scalar-field Hawking radiation emitted into the bulk by a higher-dimensional, rotating black hole. We numerically compute the angular eigenvalues, and solve the radial equation of motion in order to find transmission factors. The latter are found to be enhanced by the angular momentum of the black hole, and to exhibit the well-known effect of superradiance. The corresponding power spectra for scalar fields show an enhancement with the number of dimensions, as in the non-rotating case. We compute the total mass loss rate of the black hole for a variety of black-hole angular momenta and bulk dimensions, and find that, in all cases, the bulk emission remains significantly smaller than the brane emission. The angular-momentum loss rate is also computed and found to have a smaller value in the bulk than on the brane. We present accurate bulk-to-brane emission ratios for a range of scenarios.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 20:54:21 GMT" }, { "version": "v2", "created": "Thu, 17 Jul 2008 15:53:40 GMT" } ]
2009-12-15T00:00:00
[ [ "Casals", "M.", "" ], [ "Dolan", "S. R.", "" ], [ "Kanti", "P.", "" ], [ "Winstanley", "E.", "" ] ]
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801.4911
Oleg Verbitsky
Oleg Verbitsky
On the Double Coset Membership Problem for Permutation Groups
14 pages
Algebraic structures and their applications, pp. 351--363 (2002)
null
null
cs.CC
null
We show that the Double Coset Membership problem for permutation groups possesses perfect zero-knowledge proofs.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 16:19:20 GMT" } ]
2008-02-01T00:00:00
[ [ "Verbitsky", "Oleg", "" ] ]
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801.4912
Kyle Westfall
Kyle B. Westfall (1), Matthew A. Bershady (1), Marc A. W. Verheijen (2), David R. Andersen (3), Rob A. Swaters (4) ((1) U. Wisconsin-Madison, (2) Kapteyn, (3) NRC-HIA, (4) U. Maryland)
Deconstructing Disk Velocity Distribution Functions in the Disk-Mass Survey
4 pages, 3 figures, to appear in the proceedings of "Formation and Evolution of Galaxy Disks", Rome, October 2007, Eds. J. Funes and E. M. Corsini
null
null
null
astro-ph
null
We analyze integral-field ionized gas and stellar line-of-sight kinematics in the context of determining the stellar velocity ellipsoid for spiral galaxies observed by the Disk-Mass Survey. Our new methodology enables us to measure, for the first time, a radial gradient in the ellipsoid ratio sigma_z / sigma_R. Random errors in this decomposition are 15% at two disk scale-lengths.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 16:24:22 GMT" } ]
2008-02-01T00:00:00
[ [ "Westfall", "Kyle B.", "" ], [ "Bershady", "Matthew A.", "" ], [ "Verheijen", "Marc A. W.", "" ], [ "Andersen", "David R.", "" ], [ "Swaters", "Rob A.", "" ] ]
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801.4913
Miriam Giorgini
S. Balestra, S. Cecchini, M. Cozzi, M. Errico, F. Fabbri, G. Giacomelli, R. Giacomelli, M. Giorgini, A. Kumar, S. Manzoor, J. McDonald, G. Mandrioli, S. Marcellini, A. Margiotta, E. Medinaceli, L. Patrizii, J. Pinfold, V. Popa, I.E. Qureshi, O. Saavedra, Z. Sahnoun, G. Sirri, M. Spurio, V. Togo, A. Velarde and A. Zanini
Magnetic Monopole Search at high altitude with the SLIM experiment
11 pages. 11 EPS figures. Added Fig. 5 and ref. [15]. Added more details in Sect. 2 and 3
Eur.Phys.J.C55:57-63,2008
10.1140/epjc/s10052-008-0597-3
null
hep-ex
null
The SLIM experiment was a large array of nuclear track detectors located at the Chacaltaya high altitude Laboratory (5230 m a.s.l.). The detector was in particular sensitive to Intermediate Mass Magnetic Monopoles, with masses 10^5 < M <10^{12} GeV. From the analysis of the full detector exposed for more than 4 years a flux upper limit of 1.3 x 10^{-15} cm^{-2} s^{-1} sr^{-1} for downgoing fast Intermediate Mass Monopoles was established at the 90% C.L.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 16:28:26 GMT" }, { "version": "v2", "created": "Wed, 28 May 2008 14:21:06 GMT" } ]
2009-11-13T00:00:00
[ [ "Balestra", "S.", "" ], [ "Cecchini", "S.", "" ], [ "Cozzi", "M.", "" ], [ "Errico", "M.", "" ], [ "Fabbri", "F.", "" ], [ "Giacomelli", "G.", "" ], [ "Giacomelli", "R.", "" ], [ "Giorgini", "M.", "" ], [ "Kumar", "A.", "" ], [ "Manzoor", "S.", "" ], [ "McDonald", "J.", "" ], [ "Mandrioli", "G.", "" ], [ "Marcellini", "S.", "" ], [ "Margiotta", "A.", "" ], [ "Medinaceli", "E.", "" ], [ "Patrizii", "L.", "" ], [ "Pinfold", "J.", "" ], [ "Popa", "V.", "" ], [ "Qureshi", "I. E.", "" ], [ "Saavedra", "O.", "" ], [ "Sahnoun", "Z.", "" ], [ "Sirri", "G.", "" ], [ "Spurio", "M.", "" ], [ "Togo", "V.", "" ], [ "Velarde", "A.", "" ], [ "Zanini", "A.", "" ] ]
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801.4914
Francesco Mainardi
Francesco Mainardi, Rudolf Gorenflo
Time-fractional derivatives in relaxation processes: a tutorial survey
40 pages, 5 Figures
Fractional Calculus and Applied Analysis,Vol. 10 No 3 (2007) pp. 269-308
null
null
math-ph cond-mat.stat-mech math.DS math.MP
null
The aim of this tutorial survey is to revisit the basic theory of relaxation processes governed by linear differential equations of fractional order. The fractional derivatives are intended both in the Rieamann-Liouville sense and in the Caputo sense. After giving a necessary outline of the classical theory of linear viscoelasticity, we contrast these two types of fractional derivatives in their ability to take into account initial conditions in the constitutive equations of fractional order. We also provide historical notes on the origins of the Caputo derivative and on the use of fractional calculus in viscoelasticity.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 16:31:31 GMT" } ]
2008-05-18T00:00:00
[ [ "Mainardi", "Francesco", "" ], [ "Gorenflo", "Rudolf", "" ] ]
[ -0.0153279696, 0.073479563, -0.0100134844, -0.0410955288, -0.0038793373, 0.0126884812, -0.0947848484, 0.0449068062, -0.0081788627, 0.0142153595, 0.0630636439, -0.0193523001, -0.0699760243, 0.0039533139, 0.0966313034, 0.0978149325, 0.0396278314, 0.0185474344, 0.0792083144, 0.0944534317, 0.0402196459, -0.1192149073, -0.0416399948, -0.0024974528, -0.012191358, -0.1561440676, 0.0761782303, -0.052268967, -0.0578083396, -0.0350827016, 0.1149538532, -0.0220509712, -0.0530738346, -0.0193523001, 0.0960158184, 0.1559546888, -0.0065513751, 0.0582344458, -0.1260326058, 0.0447647721, -0.0058559943, 0.0072142063, -0.1503679752, 0.0737162903, -0.0447174273, -0.0090133194, 0.0430130027, 0.0185947791, 0.0487654321, -0.0073621599, 0.0150557347, -0.0257320497, 0.0488601215, -0.0642472729, -0.0541154258, 0.0116172982, 0.0174821708, 0.0500437468, 0.0676561147, -0.0776459277, 0.0443149917, -0.0947375, -0.0215420108, -0.0421844646, -0.1506520361, 0.0677981526, -0.1686431766, 0.0602229387, -0.0208555069, 0.0275785085, 0.0138721084, -0.0480552539, 0.0501384363, 0.0929383859, -0.0186421238, -0.0345855802, 0.0582817905, 0.1408989578, -0.0488601215, 0.019766571, 0.0861680433, 0.016866684, -0.0301588159, 0.072248593, -0.044149287, -0.0650521368, -0.0072674695, -0.0378287174, 0.0020595109, -0.0521269329, 0.0312477518, 0.1005609483, -0.0364793837, 0.1129653603, 0.0312240794, -0.1276423335, 0.0510379933, 0.0247141309, 0.0381364599, -0.0095755421, 0.004737467, 0.0426579155, -0.0316975303, -0.0164050702, 0.1847404987, -0.0249035116, -0.0606017001, -0.0196837168, -0.100939706, 0.023483159, 0.0303481948, -0.0288331527, -0.0718224868, -0.0212579407, 0.0070189079, -0.0126411356, -0.1808581948, -0.0497596785, -0.1016025394, -0.0578556843, -0.1275476366, -0.058802586, 0.0049534789, 0.002043236, 0.0701654032, -0.0825698152, 0.0182041824, -0.0812441558, -0.0297800545, -0.0483156517, 0.1105981022, -0.0423975177, -0.0484340154, -0.0909972414, -0.0103448993, -0.018665798, 0.0387519449, 0.0564353317, 0.051653482, 0.0379707515, 0.0655729324, 0.0277442168, 0.0488601215, 0.0215893555, 0.019766571, 0.0564353317, -0.0339700952, 0.0113864914, 0.0895295441, -0.0739056692, -0.0578083396, 0.0052641807, 0.0402196459, -0.0407167673, 0.0152096068, -0.0359822586, 0.0240512993, -0.0027060672, 0.0367161073, 0.0600335598, -0.0738583207, 0.0629689544, -0.0063028135, -0.0907131732, 0.0481499434, -0.1125865951, -0.0585658625, 0.0756100938, 0.003118857, 0.0021172126, 0.0536419749, -0.1138175651, -0.0307506286, -0.0517481714, 0.0826645046, -0.0125582824, 0.0277678892, 0.0232582707, 0.0012539048, 0.1347440928, -0.0017325339, 0.0602229387, -0.0663778037, 0.0414032713, -0.0232937783, -0.0296380185, -0.1311458647, -0.0316975303, -0.0013352792, 0.0595601089, -0.0173993167, 0.1282104701, 0.0724379718, 0.1191202179, -0.0190682299, -0.003737302, 0.0719645172, -0.0193878096, 0.0033200737, -0.0331415534, -0.022311369, -0.0029856991, -0.0070544165, -0.0101436833, 0.0191865936, -0.013019897, -0.0067821825, 0.0508012697, -0.1363538206, -0.0606963895, 0.0310110264, 0.0325023979, 0.0360532776, 0.0071254345, -0.1715785712, 0.008818021, -0.0686977059, 0.0289278422, -0.0158842746, 0.0760361925, 0.004524414, 0.0394621231, 0.0057997722, 0.0771724805, 0.0918494537, 0.0137774181, 0.0319105834, -0.0016925866, 0.0087233307, -0.0247378033, 0.0869729072, 0.0014284898, -0.0087647578, 0.026442226, 0.045451276, -0.0534052476, -0.0328101404, 0.0078356108, -0.0560092293, -0.0546362214, -0.0948321894, 0.057571616, -0.0988565236, -0.061690636, -0.0478895456, 0.030087797, -0.051984895, 0.0501384363, 0.0094039161, 0.0330231935, 0.0229031816, 0.0003598966, 0.1023600623, 0.0894348547, -0.0505645424, 0.0959684774 ]
801.4915
Oskar Steiner
O. Steiner, R. Rezaei, W. Schaffenberger, S. Wedemeyer-B\"ohm
The horizontal internetwork magnetic field: numerical simulations in comparison to observations with Hinode
4 pages, 3 figures, minor revisions, esp. concerning top boundary cond., ApJL accepted
null
10.1086/589740
null
astro-ph
null
Observations with the Hinode space observatory led to the discovery of predominantly horizontal magnetic fields in the photosphere of the quiet internetwork region. Here we investigate realistic numerical simulations of the surface layers of the Sun with respect to horizontal magnetic fields and compute the corresponding polarimetric response in the Fe I 630 nm line pair. We find a local maximum in the mean strength of the horizontal field component at a height of around 500 km in the photosphere, where it surpasses the vertical component by a factor of 2.0 or 5.6, depending on the initial and boundary conditions. From the synthesized Stokes profiles we derive a mean horizontal field component that is, respectively, 1.6 and 4.3 times stronger than the vertical component. This is a consequence of both the intrinsically stronger flux density of, and the larger area occupied by the horizontal fields. We find that convective overshooting expels horizontal fields to the upper photosphere, making the Poynting flux positive in the photosphere, while this quantity is negative in the convectively unstable layer below it.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 16:32:27 GMT" }, { "version": "v2", "created": "Wed, 16 Apr 2008 15:23:57 GMT" }, { "version": "v3", "created": "Fri, 2 May 2008 15:21:37 GMT" } ]
2009-11-13T00:00:00
[ [ "Steiner", "O.", "" ], [ "Rezaei", "R.", "" ], [ "Schaffenberger", "W.", "" ], [ "Wedemeyer-Böhm", "S.", "" ] ]
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801.4916
Asish Kundu K
Asish K. Kundu, V. Pralong, V. Caignaert, C. N. R. Rao, and B. Raveau
Enhancement of ferromagnetism by Co and Ni substitution in the perovskite LaBiMn2O6+d
27 pages including table and figures
J. Mater. Chem. 17, 3347 (2007)
10.1039/b710990n
null
cond-mat.mtrl-sci
null
The substitution of cobalt and nickel for manganese in the perovskite manganate LaBiMn2O6+d; has been realized, leading to the perovskites LaBiMn2-x(M)xO6+d, with M = Co, Ni and x =0-2/3. In contrast to the literature those phases are found to be orthorhombic with Pnma symmetry. More importantly, it is shown that ferromagnetism is enhanced, TC being increased from 80 K for the parent compound (x = 0) to 97 K for Ni-phase, and to 130 K for the Co-phase. Moreover, a strong competition between ferromagnetism and a glassy-ferromagnetic state in the case of nickel or a spin-glass behaviour in the case of cobalt is observed. These phenomena are interpreted in the frame of a phase separation scenario, where the ferromagnetic Mn4+/Ni2+ and Mn4+/Co2+ interactions reinforce the Mn3+/Mn4+ interactions. These compounds are found to be insulating with a relatively large positive value of thermoelectric power.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 19:18:20 GMT" } ]
2008-02-01T00:00:00
[ [ "Kundu", "Asish K.", "" ], [ "Pralong", "V.", "" ], [ "Caignaert", "V.", "" ], [ "Rao", "C. N. R.", "" ], [ "Raveau", "B.", "" ] ]
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801.4917
Oleg Verbitsky
Oleg Verbitsky
Zero-Knowledge Proofs of the Conjugacy for Permutation Groups
12 pages
Bulletin of the Lviv University, Series in Mechanics and Mathematics. Vol. 61, pp. 195--205 (2003)
null
null
cs.CC
null
We design a perfect zero-knowledge proof system for recognition if two permutation groups are conjugate.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 16:33:15 GMT" } ]
2008-02-01T00:00:00
[ [ "Verbitsky", "Oleg", "" ] ]
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801.4918
Chuanwei Zhang
Chuanwei Zhang, V.W. Scarola, Sumanta Tewari, S. Das Sarma
Reply to the Comment on "Anyonic Braiding in Optical Lattices"
1 page
null
null
null
cond-mat.other
null
This is the reply to the comment arXiv:0801.4620 by Vidal, Dusuel, and Schmidt.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 16:34:44 GMT" } ]
2008-02-01T00:00:00
[ [ "Zhang", "Chuanwei", "" ], [ "Scarola", "V. W.", "" ], [ "Tewari", "Sumanta", "" ], [ "Sarma", "S. Das", "" ] ]
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801.4919
Marek Gazdzicki
Marek Gazdzicki
Onset of Deconfinement and Critical Point: NA49 and NA61/SHINE at the CERN SPS
Presented at Zimanyi 75 Memorial Workshop on Hadronic and Quark Matter, Budapest, Hungary, July 2-4, 2007
Eur.Phys.J.ST155:37-44,2008
10.1140/epjst/e2008-00587-0
null
nucl-ex
null
This paper is dedicated to the memory of Jozsef Zimanyi one of the founders of the experiment NA49 at the CERN SPS. Firstly, the paper summarizes the main results of NA49 concerning observation of the onset of deconfinement in central Pb+Pb collisions at the low SPS energies. Secondly, it sketches the physics program of NA61 at the CERN SPS, the successor of NA49, which in particular aims to discover the critical point of strongly interacting matter. Finaly, a brief review of the future experimental programs in the CERN SPS energy range is given.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 17:06:28 GMT" } ]
2008-11-26T00:00:00
[ [ "Gazdzicki", "Marek", "" ] ]
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801.492
Dariusz Miskowiec
Dariusz Miskowiec and Peter Braun-Munzinger
Laser calibration system for the CERES Time Projection Chamber
28 pages, 26 figures; reference to the TPC preprint updated
Nucl.Instrum.Meth.A593:188-202,2008
10.1016/j.nima.2008.02.034
null
nucl-ex
null
A Nd:YAG laser was used to simulate charged particle tracks at known positions in the CERES Time Projection Chamber at the CERN SPS. The system was primarily developed to study the response of the readout electronics and to calibrate the electron drift velocity. Further applications were the determination of the gating grid transparency, the chamber position calibration, and long-term monitoring of drift properties of the gas in the detector.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 16:41:12 GMT" }, { "version": "v2", "created": "Fri, 15 Feb 2008 10:27:12 GMT" } ]
2008-11-26T00:00:00
[ [ "Miskowiec", "Dariusz", "" ], [ "Braun-Munzinger", "Peter", "" ] ]
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801.4921
Papantonopoulos Eleftherios
George Koutsoumbas, Eleftherios Papantonopoulos and George Siopsis
Phase Transitions in Charged Topological-AdS Black Holes
34 pages, 25 figures, clarifying comments and references added, to appear in JHEP
JHEP 0805:107,2008
10.1088/1126-6708/2008/05/107
null
hep-th astro-ph gr-qc
null
We study the perturbative behaviour of charged topological-AdS black holes. We calculate both analytically and numerically the quasi-normal modes of the electromagnetic and gravitational perturbations. Keeping the charge-to-mass ratio constant, we show that there is a second-order phase transition at a critical temperature at which the mass of the black hole vanishes. We pay special attention to the purely dissipative modes appearing in the spectrum as they behave singularly at the critical point.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 17:01:27 GMT" }, { "version": "v2", "created": "Tue, 27 May 2008 18:06:15 GMT" } ]
2009-12-15T00:00:00
[ [ "Koutsoumbas", "George", "" ], [ "Papantonopoulos", "Eleftherios", "" ], [ "Siopsis", "George", "" ] ]
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801.4922
Francis Bonahon
Francis Bonahon
Quantum Teichmuller theory and representations of the pure braid group
15 pages. Several typos corrected. To appear in Communications in Contemporary Mathematics
null
10.1142/S0219199708003095
null
math.GT
null
We adapt some of the methods of quantum Teichm\"uller theory to construct a family of representations of the pure braid group of the sphere.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 16:47:00 GMT" }, { "version": "v2", "created": "Tue, 3 Jun 2008 23:10:52 GMT" } ]
2018-08-02T00:00:00
[ [ "Bonahon", "Francis", "" ] ]
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801.4923
Fernando Guzman
Daniel J. Clouse (Department of Defense), Fernando Guzman (Binghamton University)
The dual geometry of Boolean semirings
18 pages
Algebra Univers. (2010) 64: 231
10.1007/s00012-011-0102-y
null
math.CT math.LO
null
It is well known that the variety of Boolean semirings, which is generated by the three element semiring S, is dual to the category of partially Stone spaces. We place this duality in the context of natural dualities. We begin by introducing a topological structure \uS and obtain an optimal natural duality between the quasi-variety ISP(S) and the category IS_cP+(\uS). Then we construct an optimal and very small structure \uS_os that yields a strong duality. The geometry of some of the partially Stone spaces that take part in these dualities is presented, and we call them "hairy cubes", as they are n-dimensional cubes with unique incomparable covers for each element of the cube. We also obtain a polynomial representation for the elements of the hairy cube.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 17:25:46 GMT" } ]
2018-03-28T00:00:00
[ [ "Clouse", "Daniel J.", "", "Department of Defense" ], [ "Guzman", "Fernando", "", "Binghamton\n University" ] ]
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801.4924
Michael Norman
Michael L. Norman
Population III Star Formation and IMF
13 pages, 16 figures, To appear in "Proceedings of First Stars III," Eds. Brian W. O'Shea, Alexander Heger & Tom Abel, AIP Conference Series
AIP Conf.Proc.990:3-15,2008
10.1063/1.2905629
null
astro-ph
null
We review recent 3D cosmological hydrodynamic simulations of primordial star formation from cosmological initial conditions (Pop III.1) and from initial conditions that have been altered by radiative feedback from stellar sources (Pop III.2). We concentrate on simulations that resolve the formation of the gravitationally unstable cloud cores in mini-halos over the mass range $10^5 < M/\Msun < 10^7 $ and follow their evolution to densities of at least $10^{10} \cmm3$ and length scales of $<10^{-2}$ pc such that accretion rates can be estimated. The advent of ensembles of such simulations exploring a variety of conditions permits us to assess the robustness of the standard model for Pop III.1 star formation and investigate scatter in their formation redshifts and accretion rates, thereby providing much needed information about the Pop III IMF. The simulations confirm the prediction that Pop III.1 stars were massive ($\sim 100 \Msun$), and form in isolation in primordial mini-halos. Simulations of Pop III.2 star forming in relic HII regions suggest somewhat lower masses ($\sim 30 \Msun$) which may help explain the chemical abundances of extremely metal poor stars. We note that no 3D simulation at present has achieved stellar density let alone followed the entire accretion history of the star in any scenario, and thus the IMF of Pop III stars remains poorly determined theoretically.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 17:08:40 GMT" } ]
2009-06-23T00:00:00
[ [ "Norman", "Michael L.", "" ] ]
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801.4925
Matthias Braun
Matthias Braun, Guido Burkard
Non-adiabatic two-parameter charge and spin pumping in a quantum dot
4.1 pages, 4 figures
Phys. Rev. Lett. 101, 036802 (2008)
10.1103/PhysRevLett.101.036802
null
cond-mat.mes-hall
null
We study DC charge and spin transport through a weakly coupled quantum dot, driven by a non-adiabatic periodic change of system parameters. We generalize the model of Tien and Gordon to simultaneously oscillating voltages and tunnel couplings. When applying our general result to the two-parameter charge pumping in quantum dots, we find interference effects between the oscillations of the voltage and tunnel couplings. Furthermore, we discuss the possibility to electrically pump a spin current in presence of a static magnetic field.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 16:58:30 GMT" } ]
2016-01-20T00:00:00
[ [ "Braun", "Matthias", "" ], [ "Burkard", "Guido", "" ] ]
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801.4926
Benne W. Holwerda
B.W. Holwerda
Host Galaxy Extinction of SNIa: Co-evolution of ISM Structure and Extinction Law with Star-Formation
7 pages, 5 figures, accepted by MNRAS
null
10.1111/j.1365-2966.2008.13050.x
null
astro-ph
null
This paper presents a mechanism that may modify the extinction law for SNIa observed at higher redshift. Starting from the observations that (1) SNIa occur predominantly in spiral galaxies, (2) star-formation ejects ISM out of the plane of spirals, (3) star-formation alters the extinction properties of the dust in the ISM, and (4) there is substantially more star-formation at higher redshift, I propose that spiral galaxies have a dustier halo in the past than they do now. The ejected material's lower value of $R_V$ will lead to a lower average value ($\bar{R}_V$) for SNIa observed at higher redshift. Two relations in SNIa observations indicate evolution of the average $R_V$: the relation of observed $R_V$ with inclination of the host galaxy at low redshift and the matching of the distribution of extinction values ($A_V$) for SNIa in different redshift intervals. The inclination effect does point to a halo with lower $R_V$ values. In contrast, the distributions of $A_V$ values match best for a $\bar{R}_V(z)$ evolution that mimics the relation of SNIa dimming with redshift attributed to the cosmological constant. However, even in the worse case scenario, the evolution $\bar{R}_V$ can not fully explain the dimming of SNIa: host galaxy extinction law evolution is not a viable alternative to account for the dimming of SNIa. Future observations of SNIa --multi-color lightcurves and spectra-- will solve separately for values of $A_V$ and $R_V$ for each SNIa . Solving for evolution of $\bar{R}_V$ (and $A_V$) with redshift will be important for the coming generation of cosmological SNIa measurements and has the bonus science of insight into the distribution of dust-rich ISM in the host galaxies in the distant past.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 17:02:46 GMT" } ]
2009-11-13T00:00:00
[ [ "Holwerda", "B. W.", "" ] ]
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801.4927
Richard J. Patterson
Steven R. Majewski
Precision Astrometry, Galactic Mergers, Halo Substructure and Local Dark Matter
8 pages, 3 figures, Proceedings of IAU Symposium 248 "A Giant Step: from Milli- to Micro-arcsecond Astrometry
IAUS.248:450,2008
10.1017/S1743921308019790
null
astro-ph
null
The concordance Cold Dark Matter model for the formation of structure in the Universe, while remarkably successful at describing observations on large scales, has a number of problems on galaxy scales. The Milky Way and its satellite system provide a key laboratory for exploring dark matter (DM) in this regime, but some of the most definitive tests of local DM await microarcsecond astrometry, such as will be delivered by the Space Interferometry Mission (SIM Planetquest). I discuss several tests of Galactic DM enabled by future microarcsecond astrometry.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 17:08:03 GMT" } ]
2010-02-19T00:00:00
[ [ "Majewski", "Steven R.", "" ] ]
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801.4928
Matthieu Josuat-Verg\`es
Matthieu Josuat-Verg\`es
Bijections between pattern-avoiding fillings of Young diagrams
15 pages Version 2: important simplification and generalization of the original bijection Version 3: small correction in references Version 4: rewritten and submitted
Journal of Combinatorial Theory Series A 117 (2010), 1218--1230
null
null
math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The pattern-avoiding fillings of Young diagrams we study arose from Postnikov's work on positive Grassman cells. They are called Le-diagrams, and are in bijection with decorated permutations. Other closely-related diagrams are interpreted as acyclic orientations of some bipartite graphs. The definition of the diagrams is the same but the avoided patterns are different. We give here bijections proving that the number of pattern-avoiding filling of a Young diagram is the same, for these two different sets of patterns. The result was obtained by Postnikov via a reccurence relation. This relation was extended by Spiridonov to obtain more general results about other patterns and other polyominoes than Young diagrams, and we show that our bijections also extend to more general polyominoes.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 17:11:55 GMT" }, { "version": "v2", "created": "Fri, 2 May 2008 14:25:07 GMT" }, { "version": "v3", "created": "Fri, 5 Sep 2008 13:13:40 GMT" }, { "version": "v4", "created": "Fri, 3 Apr 2009 15:30:31 GMT" } ]
2010-11-30T00:00:00
[ [ "Josuat-Vergès", "Matthieu", "" ] ]
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801.4929
Jose Antonio Oller
M. Albaladejo and J. A. Oller
Identification of a Scalar Glueball
5 pages, 1 figure. More data are included and reproduced. Some discussions have been rephrased
Phys.Rev.Lett.101:252002,2008
10.1103/PhysRevLett.101.252002
null
hep-ph
null
We have performed a coupled channel study of the meson-meson S-waves involving isospins (I) 0, 1/2 and 3/2 up to 2 GeV. For the first time the channels \pi\pi, K\bar{K}, \eta\eta, \sigma\sigma, \eta\eta', \eta'\eta', \rho\rho, \omega\omega, \omega\phi$, \phi\phi, a_1\pi and \pi^*\pi are considered. All the resonances with masses below 2 GeV for I=0 and 1/2 are generated by the approach. We identify the f_0(1710) and a pole at 1.6 GeV, which is an important contribution to the f_0(1500), as glueballs. This is based on an accurate agreement of our results with predictions of lattice QCD and the chiral suppression of the coupling of a scalar glueball to \bar{q}q. Another nearby pole, mainly corresponding to the f_0(1370), is a pure octet state not mixed with the glueball.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 17:23:34 GMT" }, { "version": "v2", "created": "Wed, 9 Apr 2008 06:40:54 GMT" } ]
2009-01-22T00:00:00
[ [ "Albaladejo", "M.", "" ], [ "Oller", "J. A.", "" ] ]
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801.493
Carlo Di Franco
C. Di Franco, M. Paternostro, D. I. Tsomokos, S. F. Huelga
Control-limited perfect state transfer, quantum stochastic resonance and many-body entangling gate in imperfect qubit registers
10 pages, 9 figures, RevTeX4
Phys. Rev. A 77, 062337 (2008)
10.1103/PhysRevA.77.062337
null
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We propose a protocol for perfect quantum state transfer that is resilient to a broad class of realistic experimental imperfections, including noise sources that could be modelled either as independent Markovian baths or as certain forms of spatially correlated environments. We highlight interesting connections between the fidelity of state transfer and quantum stochastic resonance effects. The scheme is flexible enough to act as an effective entangling gate for the generation of genuine multipartite entanglement in a control-limited setting. Possible experimental implementations using superconducting qubits are also briefly discussed.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 17:24:19 GMT" }, { "version": "v2", "created": "Tue, 8 Jul 2008 08:04:45 GMT" } ]
2008-07-08T00:00:00
[ [ "Di Franco", "C.", "" ], [ "Paternostro", "M.", "" ], [ "Tsomokos", "D. I.", "" ], [ "Huelga", "S. F.", "" ] ]
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801.4931
Norbert Straumann
Norbert Straumann
A Simple Proof of the Kochen-Specker Theorem on the Problem of Hidden Variables
9 pages, invited talk (birthday contribution for Ruth Durrer, Geneva, January 25, 2008)
null
10.1002/andp.200910407
null
quant-ph
null
In this talk I present a simple derivation of an old result of Kochen and Specker, which is apparently unrelated to the famous work of Bell on hidden variables, but is presumably equally important. Kochen and Specker showed in 1967 that quantum mechanics cannot be embedded into a classical stochastic theory, provided the quantum theoretical probability distributions are reproduced and one additional highly desirable property is satisfied. This showed in a striking manner what were the difficulties in implementing the Einstein programme of a `complete' version of quantum mechanics.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 17:36:08 GMT" } ]
2015-10-28T00:00:00
[ [ "Straumann", "Norbert", "" ] ]
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801.4932
Scipio Cuccagna
Scipio Cuccagna
An invariant set in energy space for supercritical NLS in 1D
null
null
null
null
math.AP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider radial solutions of a mass supercritical monic NLS and we prove the existence of a set, which looks like a hypersurface, in the space of finite energy functions, invariant for the flow and formed by solutions which converge to ground states.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 17:44:38 GMT" }, { "version": "v2", "created": "Mon, 9 Jun 2008 09:38:26 GMT" }, { "version": "v3", "created": "Sun, 21 Sep 2008 14:17:20 GMT" } ]
2008-09-21T00:00:00
[ [ "Cuccagna", "Scipio", "" ] ]
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801.4933
Nicolas Faber
N.T. Faber, C.M. Boily, S. Portegies Zwart
On time-dependent orbital complexity in gravitational N-body simulations
17 pages, 15 figures, 2 tables, accepted for publication in MNRAS
null
10.1111/j.1365-2966.2008.13041.x
null
astro-ph
null
We implement an efficient method to quantify time-dependent orbital complexity in gravitational $N$-body simulations. The technique, which we name DWaTIM, is based on a discrete wavelet transform of velocity orbital time series. The wavelet power-spectrum is used to measure trends in complexity continuously in time. We apply the method to the test cases N=3 Pythagorean- and a perturbed N=5 Caledonian configurations. The method recovers the well-known time-dependent complexity of the dynamics in these small-$N$ problems. We then apply the technique to an equal-mass collisional N=256 body simulation ran through core-collapse. We find that a majority of stars evolve on relatively complex orbits up to the time when the first hard binary forms, whereas after core-collapse, less complex orbits are found on the whole as a result of expanding mass shells.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 12:16:08 GMT" }, { "version": "v2", "created": "Sat, 2 Feb 2008 09:24:40 GMT" } ]
2009-11-13T00:00:00
[ [ "Faber", "N. T.", "" ], [ "Boily", "C. M.", "" ], [ "Zwart", "S. Portegies", "" ] ]
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801.4934
Mark Rushton
M. T. Rushton, A. Evans, S. P. S. Eyres, J. Th. van Loon, B. Smalley
How peculiar is the "peculiar variable" DZ Crucis (Nova Cru 2003)?
6 pages, 4 figures. MNRAS in press
null
10.1111/j.1365-2966.2008.13031.x
null
astro-ph
null
The variable star DZ Cru was thought to be a nova when it was discovered in eruption in 2003 August. This explanation was later challenged, however, when the first spectra of the object were reported. We present near infrared spectroscopy of DZ Cru obtained at the New Technology Telescope on 3 occasions, starting 1.5 years after outburst, with the aim of establishing the nature of the object. The spectra display H I, O I, [N I] emission lines, together with He I P Cygni lines superposed on a dust continuum. These observations suggest the "peculiar variable in Crux'' is a classical nova.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 17:51:22 GMT" } ]
2009-11-13T00:00:00
[ [ "Rushton", "M. T.", "" ], [ "Evans", "A.", "" ], [ "Eyres", "S. P. S.", "" ], [ "van Loon", "J. Th.", "" ], [ "Smalley", "B.", "" ] ]
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801.4935
Milton da Costa Lopes Fo.
D. Iftimie, M. C. Lopes Filho, H. J. Nussenzveig Lopes
Incompressible flow around a small obstacle and the vanishing viscosity limit
Submitted for publication
Comm. Math. Phys. 287 (2009), 99-115
10.1007/s00220-008-0621-3
null
math.AP
null
In this article we consider viscous flow in the exterior of an obstacle satisfying the standard no-slip boundary condition at the surface of the obstacle. We seek conditions under which solutions of the Navier-Stokes system in the exterior domain converge to solutions of the Euler system in the full space when both viscosity and the size of the obstacle vanish. We prove that this convergence is true assuming two hypothesis: first, that the initial exterior domain velocity converges strongly in $L^2$ to the full-space initial velocity and second, that the diameter of the obstacle is smaller than a suitable constant times viscosity, or, in other words, that the obstacle is sufficiently small. The convergence holds as long as the solution to the limit problem is known to exist and stays sufficiently smooth. This work complements the study of incompressible flow around small obstacles, which has been carried out in [1,2,3] [1] D. Iftimie and J. Kelliher, {\it Remarks on the vanishing obstacle limit for a 3D viscous incompressible fluid.} Preprint available at http://math.univ-lyon1.fr/~iftimie/ARTICLES/viscoushrink3d.pdf . [2] D. Iftimie, M. C. Lopes Filho, and H. J. Nussenzveig Lopes. {\it Two dimensional incompressible ideal flow around a small obstacle.} Comm. Partial Differential Equations {\bf 28} (2003), no. 1-2, 349--379. [3] D. Iftimie, M. C. Lopes Filho, and H. J. Nussenzveig Lopes. {\it Two dimensional incompressible viscous flow around a small obstacle.} Math. Ann. {\bf 336} (2006), no. 2, 449--489.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 17:55:41 GMT" } ]
2009-02-17T00:00:00
[ [ "Iftimie", "D.", "" ], [ "Filho", "M. C. Lopes", "" ], [ "Lopes", "H. J. Nussenzveig", "" ] ]
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801.4936
Jonay I. Gonzalez Hernandez
Jonay I. Gonz\'alez Hern\'andez, Rafael Rebolo, Garik Israelian, Alexei V. Filippenko, Ryan Chornock, Nozomu Tominaga, Hideyuki Umeda, and Ken'ichi Nomoto
Chemical Abundances of the Secondary Star in the Black Hole X-ray Binary XTE J1118+480
Accepted for publication in the Astrophysical Journal
null
10.1086/586888
null
astro-ph
null
Following the recent abundance measurements of Mg, Al, Ca, Fe, and Ni in the black hole X-ray binary XTE J1118+480 using medium-resolution Keck II/ESI spectra of the secondary star (Gonz\'alez Hern\'andez et al. 2006), we perform a detailed abundance analysis including the abundances of Si and Ti. These element abundances, higher than solar, indicate that the black hole in this system formed in a supernova event, whose nucleosynthetic products could pollute the atmosphere of the secondary star, providing clues on the possible formation region of the system, either Galactic halo, thick disk, or thin disk. We explore a grid of explosion models with different He core masses, metallicities, and geometries. Metal-poor models associated with a formation scenario in the Galactic halo provide unacceptable fits to the observed abundances, allowing us to reject a halo origin for this X-ray binary. The thick-disk scenario produces better fits, although they require substantial fallback and very efficient mixing processes between the inner layers of the explosion and the ejecta, making quite unlikely an origin in the thick disk. The best agreement between the model predictions and the observed abundances is obtained for metal-rich progenitor models. In particular, non-spherically symmetric models are able to explain, without strong assumptions of extensive fallback and mixing, the observed abundances. Moreover, asymmetric mass ejection in a supernova explosion could account for the required impulse necessary to launch the system from its formation region in the Galactic thin disk to its current halo orbit.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 17:56:09 GMT" } ]
2009-11-13T00:00:00
[ [ "Hernández", "Jonay I. González", "" ], [ "Rebolo", "Rafael", "" ], [ "Israelian", "Garik", "" ], [ "Filippenko", "Alexei V.", "" ], [ "Chornock", "Ryan", "" ], [ "Tominaga", "Nozomu", "" ], [ "Umeda", "Hideyuki", "" ], [ "Nomoto", "Ken'ichi", "" ] ]
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801.4937
Ilya S. Kofman
Abhijit Champanerkar, Ilya Kofman
On mutation and Khovanov homology
Revised and expanded with a review of the spanning tree complex. To appear in Communications in Contemporary Mathematics, special volume in memory of Xiao-Song Lin. 18 pages
Comm. Contemp. Math. 10 (2008), 973-992. (Special issue in memory of Xiao-Song Lin.)
null
null
math.GT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
It is conjectured that the Khovanov homology of a knot is invariant under mutation. In this paper, we review the spanning tree complex for Khovanov homology, and reformulate this conjecture using a matroid obtained from the Tait graph (checkerboard graph) G of a knot diagram K. The spanning trees of G provide a filtration and a spectral sequence that converges to the reduced Khovanov homology of K. We show that the E_2-term of this spectral sequence is a matroid invariant and hence invariant under mutation.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 18:18:41 GMT" }, { "version": "v2", "created": "Tue, 12 Aug 2008 19:07:01 GMT" } ]
2009-04-22T00:00:00
[ [ "Champanerkar", "Abhijit", "" ], [ "Kofman", "Ilya", "" ] ]
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801.4938
Stephanie Trine
Ulrich Nierste, Stephanie Trine, Susanne Westhoff
Charged-Higgs effects in a new B -> D tau nu differential decay distribution
5 pages, plots of HFAG form factor and B -> tau nu branching fraction included, text extended, conclusions unchanged, to appear in Phys. Rev. D
Phys.Rev.D78:015006,2008
10.1103/PhysRevD.78.015006
TTP08-06, SFB/CPP-08-11
hep-ph
null
We show that the decay mode B -> D tau nu is competitive with and complementary to B -> tau nu in the search for charged-Higgs effects. Updating the relevant form factors, we find that the differential distribution in the decay chain B -> D nu tau[-> pi nu] excellently discriminates between Standard-Model and charged-Higgs contributions. By measuring the D and pi energies and the angle between the D and pi three-momenta one can determine the effective charged-Higgs coupling including a possible CP-violating phase.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 18:13:13 GMT" }, { "version": "v2", "created": "Mon, 2 Jun 2008 19:31:24 GMT" } ]
2008-11-26T00:00:00
[ [ "Nierste", "Ulrich", "" ], [ "Trine", "Stephanie", "" ], [ "Westhoff", "Susanne", "" ] ]
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801.4939
Plamen Iliev
Plamen Iliev
Bispectral commuting difference operators for multivariable Askey-Wilson polynomials
null
Trans. Amer. Math. Soc. 363 (2011), no. 3, 1577--1598
10.1090/S0002-9947-2010-05183-9
null
math.CA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We construct a commutative algebra A_z, generated by d algebraically independent q-difference operators acting on variables z_1, z_2,..., z_d, which is diagonalized by the multivariable Askey-Wilson polynomials P_n(z) considered by Gasper and Rahman [6]. Iterating Sears' transformation formula, we show that the polynomials P_n(z) possess a certain duality between z and n. Analytic continuation allows us to obtain another commutative algebra A_n, generated by d algebraically independent difference operators acting on the discrete variables n_1, n_2,..., n_d, which is also diagonalized by P_n(z). This leads to a multivariable q-Askey-scheme of bispectral orthogonal polynomials which parallels the theory of symmetric functions.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 18:14:22 GMT" }, { "version": "v2", "created": "Sun, 22 Feb 2009 16:20:44 GMT" }, { "version": "v3", "created": "Fri, 14 Aug 2009 16:07:11 GMT" } ]
2012-05-08T00:00:00
[ [ "Iliev", "Plamen", "" ] ]
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801.494
Luca De Sanctis
Luca De Sanctis, Francesco Guerra
Mean field dilute ferromagnet I. High temperature and zero temperature behavior
38 pages
null
10.1007/s10955-008-9575-2
null
cond-mat.stat-mech cond-mat.dis-nn
null
We study the mean field dilute model of a ferromagnet. We find and prove an expression for the free energy density at high temperature, and at temperature zero. We find the critical line of the model, separating the phase with zero magnetization from the phase with symmetry breaking. We also compute exactly the entropy at temperature zero, which is strictly positive. The physical behavior at temperature zero is very interesting and related to infinite dimensional percolation, and suggests possible behaviors at generic low temperatures. Lastly, we provide a complete solution for the annealed model. Our results hold both for the Poisson and the Bernoulli versions of the model.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 18:17:30 GMT" }, { "version": "v2", "created": "Fri, 1 Feb 2008 11:19:38 GMT" }, { "version": "v3", "created": "Mon, 4 Feb 2008 09:23:42 GMT" }, { "version": "v4", "created": "Mon, 3 Mar 2008 09:43:38 GMT" } ]
2009-11-13T00:00:00
[ [ "De Sanctis", "Luca", "" ], [ "Guerra", "Francesco", "" ] ]
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801.4941
Wing Yan Yip
Wing Yan Yip, Sofia Olhede, David Stephens
Hedging strategies and minimal variance portfolios for European and exotic options in a Levy market
32 pages, 6 figures
null
null
null
q-fin.PM math.PR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper presents hedging strategies for European and exotic options in a Levy market. By applying Taylor's Theorem, dynamic hedging portfolios are con- structed under different market assumptions, such as the existence of power jump assets or moment swaps. In the case of European options or baskets of European options, static hedging is implemented. It is shown that perfect hedging can be achieved. Delta and gamma hedging strategies are extended to higher moment hedging by investing in other traded derivatives depending on the same underlying asset. This development is of practical importance as such other derivatives might be readily available. Moment swaps or power jump assets are not typically liquidly traded. It is shown how minimal variance portfolios can be used to hedge the higher order terms in a Taylor expansion of the pricing function, investing only in a risk-free bank account, the underlying asset and potentially variance swaps. The numerical algorithms and performance of the hedging strategies are presented, showing the practical utility of the derived results.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 20:24:42 GMT" }, { "version": "v2", "created": "Mon, 5 May 2008 16:06:53 GMT" }, { "version": "v3", "created": "Mon, 5 May 2008 23:32:37 GMT" }, { "version": "v4", "created": "Sat, 18 Oct 2008 10:51:41 GMT" } ]
2008-12-10T00:00:00
[ [ "Yip", "Wing Yan", "" ], [ "Olhede", "Sofia", "" ], [ "Stephens", "David", "" ] ]
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801.4942
Sergiu Vacaru I.
Sergiu I. Vacaru
Loop Quantum Gravity in Ashtekar and Lagrange-Finsler Variables and Fedosov Quantization of General Relativity
latex 2e, 11pt, 48 pages, 1 latex figure, discussion added
The Icfai Univ. J. Physics, 2 (2009) issue 4
null
null
gr-qc hep-th math-ph math.MP
null
We propose an unified approach to loop quantum gravity and Fedosov quantization of gravity following the geometry of double spacetime fibrations and their quantum deformations. There are considered pseudo-Riemannian manifolds enabled with 1) a nonholonomic 2+2 distribution defining a nonlinear connection (N-connection) structure and 2) an Arnowitt-Deser-Misner 3+1 decomposition. The Ashtekar-Barbero variables are generalized and adapted to the N-connection structure which allows us to write the general relativity theory equivalently in terms of Lagrange-Finsler variables and related canonical almost symplectic forms and connections. The Fedosov results are re-defined for gravitational gauge like connections and there are analyzed the conditions when the star product for deformation quantization is computed in terms of geometric objects in loop quantum gravity. We speculate on equivalence of quantum gravity theories with 3+1 and 2+2 splitting and quantum analogs of the Einstein equations.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 18:30:15 GMT" }, { "version": "v2", "created": "Sun, 10 Feb 2008 00:24:16 GMT" } ]
2009-11-21T00:00:00
[ [ "Vacaru", "Sergiu I.", "" ] ]
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801.4943
Jonathan J. Fortney
Jonathan J. Fortney
The Impact of Transit Observations on Planetary Physics
Extreme Solar Systems (June 25-29, 2007, Santorini) contribution. Submitted to conference proceedings in September 2007
null
null
null
astro-ph
null
We highlight the importance of transit observations on understanding the physics of planetary atmospheres and interiors. Transmission spectra and emission spectra allow us to characterize this exotic atmospheres, which possess TiO, VO, H2O, CO, Na, and K, as principal absorbers. We calculate mass-radius relations for water-rock-iron and gas giant planets and examine these relations in light of current and future transit observations. A brief review is given of mechanisms that could lead to the large radii observed for some transiting planets.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 18:31:05 GMT" } ]
2008-02-01T00:00:00
[ [ "Fortney", "Jonathan J.", "" ] ]
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801.4944
Moshe Schechter
M. Schechter and P. C. E. Stamp
What are the interactions in quantum glasses?
12 pages, 2 figures. Minor modifications, published version
J. Phys.: Condens. Matter 20, 244136 (2008)
10.1088/0953-8984/20/24/244136
null
cond-mat.dis-nn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The form of the low-temperature interactions between defects in neutral glasses is reconsidered. We analyse the case where the defects can be modelled either as simple 2-level tunneling systems, or tunneling rotational impurities. The coupling to strain fields is determined up to 2nd order in the displacement field. It is shown that the linear coupling generates not only the usual $1/r^3$ Ising-like interaction between the rotational tunneling defect modes, which cause them to freeze around a temperature $T_G$, but also a random field term. At lower temperatures the inversion symmetric tunneling modes are still active - however the coupling of these to the frozen rotational modes, now via the 2nd-order coupling to phonons, generates another random field term acting on the inversion symmetric modes (as well as shorter-range $1/r^5$ interactions between them). Detailed expressions for all these couplings are given.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 18:34:31 GMT" }, { "version": "v2", "created": "Wed, 11 Jun 2008 23:06:19 GMT" } ]
2009-11-13T00:00:00
[ [ "Schechter", "M.", "" ], [ "Stamp", "P. C. E.", "" ] ]
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801.4945
Stefano Sanvito
C.D. Pemmaraju, R. Hanafin, T. Archer, H.B. Braun and S. Sanvito
Impurity-Ion pair induced high-temperature ferromagnetism in Co-doped ZnO
null
null
10.1103/PhysRevB.78.054428
null
cond-mat.mtrl-sci
null
Magnetic 3d-ions doped into wide-gap oxides show signatures of room temperature ferromagnetism, although their concentration is two orders of magnitude smaller than that in conventional magnets. The prototype of these exceptional materials is Co-doped ZnO, for which an explanation of the room temperature ferromagnetism is still elusive. Here we demonstrate that magnetism originates from Co2+ oxygen-vacancy pairs with a partially filled level close to the ZnO conduction band minimum. The magnetic interaction between these pairs is sufficiently long-ranged to cause percolation at moderate concentrations. However, magnetically correlated clusters large enough to show hysteresis at room temperature already form below the percolation threshold and explain the current experimental findings. Our work demonstrates that the magnetism in ZnO:Co is entirely governed by intrinsic defects and a phase diagram is presented. This suggests a recipe for tailoring the magnetic properties of spintronics materials by controlling their intrinsic defects.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 18:35:46 GMT" } ]
2009-11-13T00:00:00
[ [ "Pemmaraju", "C. D.", "" ], [ "Hanafin", "R.", "" ], [ "Archer", "T.", "" ], [ "Braun", "H. B.", "" ], [ "Sanvito", "S.", "" ] ]
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801.4946
A. Yu. Petrov
E. Passos, A. Yu. Petrov
Two-dimensional Lorentz-violating Chern-Simons-like action
10 pages, references added, version accepted to Physics Letters B
Phys.Lett.B662:441-444,2008; Erratum-ibid.B664:318,2008
10.1016/j.physletb.2008.03.053 10.1016/j.physletb.2008.05.046
null
hep-th
null
We demonstrate generation of the two-dimensional Chern-Simons-like Lorentz-breaking action via an appropriate Lorentz-breaking coupling of scalar and spinor fields at zero as well as at the finite temperature and via the noncommutative fields method and study the dispersion relations corresponding to this action.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 18:42:18 GMT" }, { "version": "v2", "created": "Thu, 7 Feb 2008 14:16:59 GMT" }, { "version": "v3", "created": "Fri, 21 Mar 2008 18:52:46 GMT" } ]
2010-10-27T00:00:00
[ [ "Passos", "E.", "" ], [ "Petrov", "A. Yu.", "" ] ]
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801.4947
Francis Dolan
F.A. Dolan and H. Osborn
Applications of the Superconformal Index for Protected Operators and q-Hypergeometric Identities to N=1 Dual Theories
47 pages, uses harvmac, v2. minor corrections, SO(N) cases proved, ref. added, v3. minor additions and corrections
Nucl.Phys.B818:137-178,2009
10.1016/j.nuclphysb.2009.01.028
null
hep-th
null
The results of Romelsberger for a N=1 superconformal index counting protected operators, satisfying a BPS condition and which cannot be combined to form long multiplets, are analysed further. The index is expressible in terms of single particle superconformal characters for N=1 scalar and vector multiplets. For SQCD, involving SU(N_c) gauge groups and appropriate numbers of flavours N_f, the formula used to construct the index may be proved to give identical results for theories linked by Seiberg duality using recently proved theorems for q-series elliptic hypergeometric integrals. The discussion is also extended to Kutasov-Schwimmer dual theories in the large N_c, N_f limit and to dual theories with Sp(N) and SO(N) gauge groups. For the former, a transformation identity for elliptic hypergeometric integrals directly verifies that the index is the same for the electric and magnetic theories. For SO(N) theories the corresponding result may also be obtained from the same basic identity. An expansion of the index to several orders is also obtained in a form where the detailed protected operator content may be read off. Relevant mathematical results are reviewed.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 18:57:01 GMT" }, { "version": "v2", "created": "Thu, 7 Feb 2008 19:28:49 GMT" }, { "version": "v3", "created": "Wed, 27 Feb 2008 20:13:51 GMT" } ]
2009-08-11T00:00:00
[ [ "Dolan", "F. A.", "" ], [ "Osborn", "H.", "" ] ]
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801.4948
Todd Fisher
Todd Fisher
Trivial centralizers for Axiom A diffeomorphisms
18 pages
null
10.1088/0951-7715/21/11/002
null
math.DS
null
We show there is a residual set of non-Anosov $C^{\infty}$ Axiom A diffeomorphisms with the no cycles property whose elements have trivial centralizer. If $M$ is a surface and $2\leq r\leq \infty$, then we will show there exists an open and dense set of of $C^r$ Axiom A diffeomorphisms with the no cycles property whose elements have trivial centralizer. Additionally, we examine commuting diffeomorphisms preserving a compact invariant set $\Lambda$ where $\Lambda$ is a hyperbolic chain recurrent class for one of the diffeomorphisms.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 20:44:40 GMT" } ]
2009-11-13T00:00:00
[ [ "Fisher", "Todd", "" ] ]
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801.4949
Elena G. Ferreiro
E. G. Ferreiro, F. Fleuret and A. Rakotozafindrabe
Transverse momentum dependence of J/psi shadowing effects
4 pages, 4 figures. Final version for journal submission
Eur.Phys.J.C61:859-864,2009
10.1140/epjc/s10052-008-0843-8
null
hep-ph
null
We present a new approach to estimate the effect of the gluon shadowing in nucleus+nucleus collisions and its consequences on the J/psi production yield. Using kinematical information available from the measured J/psi production in proton+proton collisions at \sqrt s = 200 GeV, we build a Glauber Monte Carlo code which takes into account shadowing in two alternative ways: multiple scattering corrections or Q2 evolution of parton densities. We exploit the dependence of these different parameterizations to the J/psi transverse momentum and we give the first predictions on the resulting pT dependence of the nuclear modification factor in deuteron+gold collisions at the same energy.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 18:54:21 GMT" }, { "version": "v2", "created": "Thu, 6 Mar 2008 14:54:50 GMT" } ]
2009-07-22T00:00:00
[ [ "Ferreiro", "E. G.", "" ], [ "Fleuret", "F.", "" ], [ "Rakotozafindrabe", "A.", "" ] ]
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801.495
Jonathan C. Tan
Jonathan C. Tan (Dept. of Astronomy, University of Florida)
Turmoil in Orion: The Nearest Massive Protostar
9 pages, in proceedings of Massive Star Formation: Observations confront Theory, H. Beuther et al. (eds.)
null
null
null
astro-ph
null
I discuss different theories of massive star formation: formation from massive cores, competitive Bondi-Hoyle accretion, and protostellar collisions. I summarize basic features of the Turbulent Core Model (TCM). I then introduce the Orion Kleinmann-Low (KL) region, embedded in the Orion Nebula Cluster (ONC) and one of the nearest regions of massive star formation. The KL region contains three principal radio sources, known as "I", "n" and "BN". BN is known to be a runaway star, almost certainly set in motion by dynamical ejection within the ONC from a multiple system of massive stars, that would leave behind a recoiling, hard, massive, probably eccentric binary. I review the debate about whether this binary is Theta^1C, the most massive star in the ONC, or source "I", and argue that it is most likely to be Theta^1C, since this is now known be a recoiling, hard, massive, eccentric binary, with properties that satisfy the energy and momentum constraints implied by BN's motion. Source "n" is a relatively low-mass protostar with extended radio emission suggestive of a bipolar outflow. Source "I", located near the center of the main gas concentration in the region, the Orion Hot Core, is the likely location of a massive protostar that is powering the KL region, and I discuss how its basic properties are consistent with predictions from the TCM. In this scenario, the radio emission from source "I" is the base of a bipolar outflow that is ionized by the massive protostar and should be elongated along the axis of the outflow.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 20:30:28 GMT" } ]
2008-02-01T00:00:00
[ [ "Tan", "Jonathan C.", "", "Dept. of Astronomy, University of Florida" ] ]
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801.4951
Scott Sanders
Scott N. Sanders (1), Florian Mintert (2 and 3), Eric J. Heller (3) ((1) Massachusetts Institute of Technology, (2) Albert-Ludwigs-Universit\"at Freiburg, (3) Harvard University)
Recoil Free Scattering From a Free Gas
9 pages, 2 figures
null
10.1103/PhysRevA.79.023610
null
physics.atom-ph
null
We present a treatment of decoherence in an atom due to scattering from a gas of free particles. We show that there is a recoil free scattering process that leaves both the atom and the gas in an unchanged state, but allows for the acquisition of a phase shift that remains in the free space limit. This is essential to understanding decoherence in a separated arm atom interferometer, where a gas of atoms forms a refractive medium for a matter wave. Our work clarifies the extent to which scattering of a free particle acts as a which-way measurement.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 18:57:48 GMT" } ]
2009-11-13T00:00:00
[ [ "Sanders", "Scott N.", "", "2 and 3" ], [ "Mintert", "Florian", "", "2 and 3" ], [ "Heller", "Eric J.", "" ] ]
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801.4952
Maria Lu\'isa Arruda
Lu\'isa Arruda, Fernando Bar\~ao, Patr\'icia Gon\c{c}alves, Rui Pereira
Cosmic ray velocity and electric charge measurements with the AMS/RICH detector: prototype results
5 pages. Contribution to the 20th European Cosmic Ray Symposium in Lisbon, Portugal. September 5th-8th 2006. Presenter: Luisa Arruda
Electronic publication in Proceedings of the 20th European Cosmic Ray Symposium in Lisbon - http://www.lip.pt/events/2006/ecrs/proc/ecrs06-s0-159.pdf
null
null
astro-ph
null
The Alpha Magnetic Spectrometer (AMS) to be installed on the International Space Station (ISS) will measure charged cosmic ray spectra of elements up to iron, in the rigidity range from 1 GV to 1 TV, for at least three years. AMS is a large angular spectrometer composed of different subdetectors, including a proximity focusing Ring Imaging CHerenkov (RICH) detector. This will be equipped with a mixed radiator made of aerogel and sodium fluoride (NaF), a lateral conical mirror and a detection plane made of 680 photomultipliers coupled to light guides. The RICH detector allows measurements of particle's electric charge up to iron, and particle's velocity. Two possible methods for reconstructing the Cherenkov angle and the electric charge with the RICH will be discussed. A RICH prototype consisting of a detection matrix with 96 photomultipliers, a segment of a conical mirror and samples of the radiator materials was built and its performance was evaluated using ion beam data. Results from the last test beam performed with ion fragments resulting from the collision of a 158 GeV/c/nucleon primary beam of indium ions (CERN SPS) on a lead target are reported. The large amount of collected data allowed to test and characterize different aerogel samples and the NaF radiator. In addition, the reflectivity of the mirror was evaluated. The data analysis confirms the design goals.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 19:09:29 GMT" } ]
2008-02-01T00:00:00
[ [ "Arruda", "Luísa", "" ], [ "Barão", "Fernando", "" ], [ "Gonçalves", "Patrícia", "" ], [ "Pereira", "Rui", "" ] ]
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801.4953
Mohamad Ali Jafarizadeh
M. A. Jafarizadeh, Y. Akbari, K. Aghayar, A. Heshmati, M. Mahdian
Investigating a Class of $2\otimes2\otimes d$ Chessboard Density Matrices via Linear and Non-linear Entanglement Witnesses Constructed by Exact Convex Optimization
35 pages, 1 figures
null
10.1103/PhysRevA.78.032313
null
quant-ph
null
Here we consider a class of $2\otimes2\otimes d$ chessboard density matrices starting with three-qubit ones which have positive partial transposes with respect to all subsystems. To investigate the entanglement of these density matrices, we use the entanglement witness approach. For constructing entanglement witnesses (EWs) detecting these density matrices, we attempt to convert the problem to an exact convex optimization problem. To this aim, we map the convex set of separable states into a convex region, named feasible region, and consider cases that the exact geometrical shape of feasible region can be obtained. In this way, various linear and non-linear EWs are constructed. The optimality and decomposability of some of introduced EWs are also considered. Furthermore, the detection of the density matrices by introduced EWs are discussed analytically and numerically. {\bf Keywords: chessboard density matrices, optimal non-linear entanglement witnesses, convex optimization} {\bf PACs Index: 03.65.Ud}
[ { "version": "v1", "created": "Thu, 31 Jan 2008 19:03:19 GMT" } ]
2009-11-13T00:00:00
[ [ "Jafarizadeh", "M. A.", "" ], [ "Akbari", "Y.", "" ], [ "Aghayar", "K.", "" ], [ "Heshmati", "A.", "" ], [ "Mahdian", "M.", "" ] ]
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801.4954
Yousaf Mahmood Butt
Yousaf Butt, Troy Porter, Boaz Katz, Eli Waxman
X-ray Hotspot Flares and Implications for Cosmic Ray Acceleration and Magnetic Field amplification in Supernova Remnants
accepted for publication in MNRAS Letters
null
10.1111/j.1745-3933.2008.00452.x
null
astro-ph
null
For more than fifty years, it has been believed that cosmic ray (CR) nuclei are accelerated to high energies in the rapidly expanding shockwaves created by powerful supernova explosions. Yet observational proof of this conjecture is still lacking. Recently, Uchiyama and collaborators reported the detection of small-scale X-ray flares in one such supernova remnant, dubbed 'RX J1713-3946' (a.k.a. G347.3-0.5), which also emits very energetic, TeV (10^12 eV) range, gamma-rays. They contend that the variability of these X-ray 'hotspots' implies that the magnetic field in the remnant is about a hundred times larger than normally assumed; and this, they say, means that the detected TeV range photons were produced in energetic nuclear interactions, providing 'a strong argument for acceleration of protons and nuclei to energies of 1 PeV (10^15 eV) and beyond in young supernova remnants.' We point out here that the existing multiwavelength data on this object certainly do not support such conclusions. Though intriguing, the small-scale X-ray flares are not the long sought-after 'smoking gun' of nucleonic CR acceleration in SNRs.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 19:06:37 GMT" } ]
2009-11-13T00:00:00
[ [ "Butt", "Yousaf", "" ], [ "Porter", "Troy", "" ], [ "Katz", "Boaz", "" ], [ "Waxman", "Eli", "" ] ]
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801.4955
Fr\'ed\'eric Galliano
F. Galliano, S. C. Madden, A. G. G. M. Tielens, E. Peeters, A. P. Jones
Variations of the Mid-IR Aromatic Features Inside and Among Galaxies
Accepted by the ApJ, 67 pages, 70 figures
null
10.1086/587051
null
astro-ph
null
We present the results of a systematic study of mid-IR spectra of Galactic regions, Magellanic HII regions, and galaxies of various types (dwarf, spiral, starburst), observed by the satellites ISO and Spitzer. We study the relative variations of the 6.2, 7.7, 8.6 and 11.3 micron features inside spatially resolved objects (such as M82, M51, 30 Doradus, M17 and the Orion Bar), as well as among 90 integrated spectra of 50 objects. Our main results are that the 6.2, 7.7 and 8.6 micron bands are essentially tied together, while the ratios between these bands and the 11.3 micron band varies by one order of magnitude. This implies that the properties of the PAHs are remarkably universal throughout our sample, and that the relative variations of the band ratios are mainly controled by the fraction of ionized PAHs. In particular, we show that we can rule out both the modification of the PAH size distribution, and the mid-infrared extinction, as an explanation of these variations. Using a few well-studied Galactic regions (including the spectral image of the Orion Bar), we give an empirical relation between the I(6.2)/I(11.3) ratio and the ionization/recombination ratio G0/ne.Tgas^0.5, therefore providing a useful quantitative diagnostic tool of the physical conditions in the regions where the PAH emission originates. Finally, we discuss the physical interpretation of the I(6.2)/I(11.3) ratio, on galactic size scales.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 19:08:19 GMT" }, { "version": "v2", "created": "Fri, 1 Feb 2008 04:02:57 GMT" } ]
2009-11-13T00:00:00
[ [ "Galliano", "F.", "" ], [ "Madden", "S. C.", "" ], [ "Tielens", "A. G. G. M.", "" ], [ "Peeters", "E.", "" ], [ "Jones", "A. P.", "" ] ]
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801.4956
Jelle Hartong
E. A. Bergshoeff, J. Hartong, A. Ploegh and D. Sorokin
Q-instantons
29 pages, 1 figure
JHEP 0806:028,2008
10.1088/1126-6708/2008/06/028
UG-08-02
hep-th
null
We construct the half-supersymmetric instanton solutions that are electric-magnetically dual to the recently discussed half-supersymmetric Q7-branes. We call these instantons `Q-instantons'. Whereas the D-instanton is most conveniently described using the RR axion \chi and the dilaton \phi, the Q-instanton is most conveniently described using a different set of fields \chi' and T, where \chi' is an axionic scalar. The real part of the Q-instanton on-shell action is a function of T and the imaginary part is linear in \chi'. Discrete shifts of the axion \chi' correspond to PSL(2,Z) transformations that are of finite order. These are e.g. pure S-duality transformations relating weak and strongly coupled regimes. We argue that near each orbifold point of the quantum axion-dilaton moduli space PSL(2,Z)\PSL(2,R)/SO(2) the higher order R^4 terms in the string effective action contain contributions from an infinite sum of single multiply-charged instantons with the Q-instantons corresponding to the orbifold points \tau=i,\rho where \tau is the complex axion-dilaton field.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 19:11:23 GMT" } ]
2014-11-18T00:00:00
[ [ "Bergshoeff", "E. A.", "" ], [ "Hartong", "J.", "" ], [ "Ploegh", "A.", "" ], [ "Sorokin", "D.", "" ] ]
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801.4957
Maria Lu\'isa Arruda
Lu\'isa Arruda, Rui Pereira, Fernando Bar\~ao, Gaspar Barreira, Jo\~ao Borges, Patr\'icia Gon\c{c}alves, M\'ario Pimenta
AMS - a magnetic spectrometer on the international space station
2 pages. Contribution to the 15th Portuguese National Meeting on Astronomy and Astrophysics (Lisbon, Portugal 2005). Presenters: Luisa Arruda, Rui Pereira
Published in Proceedings of 2005 Past Meets Present in Astronomy and Astrophysics (Lisbon 2005), p. 77-78, World Scientific
null
null
astro-ph
null
The Alpha Magnetic Spectrometer (AMS) is a particle detector, designed to search for cosmic antimatter and dark matter and to study the elemental and isotopic composition of primary cosmic rays, that will be installed on the International Space Station (ISS) in 2008 to operate for at least three years. The detector will be equipped with a ring imaging Cherenkov detector (RICH) enabling measurements of particle electric charge and velocity with unprecedented accuracy. Physics prospects and test beam results are shortly presented.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 19:20:03 GMT" } ]
2008-02-01T00:00:00
[ [ "Arruda", "Luísa", "" ], [ "Pereira", "Rui", "" ], [ "Barão", "Fernando", "" ], [ "Barreira", "Gaspar", "" ], [ "Borges", "João", "" ], [ "Gonçalves", "Patrícia", "" ], [ "Pimenta", "Mário", "" ] ]
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801.4958
Sergiu Vacaru I.
Sergiu I. Vacaru
Finsler and Lagrange Geometries in Einstein and String Gravity
latex 2e, 11pt, 44 pages; accepted to IJGMMP (2008) as a short variant of arXiv:0707.1524v3, on 86 pages
Int.J.Geom.Meth.Mod.Phys.05:473-511,2008
10.1142/S0219887808002898
null
gr-qc hep-th math-ph math.MP
null
We review the current status of Finsler-Lagrange geometry and generalizations. The goal is to aid non-experts on Finsler spaces, but physicists and geometers skilled in general relativity and particle theories, to understand the crucial importance of such geometric methods for applications in modern physics. We also would like to orient mathematicians working in generalized Finsler and Kahler geometry and geometric mechanics how they could perform their results in order to be accepted by the community of ''orthodox'' physicists. Although the bulk of former models of Finsler-Lagrange spaces where elaborated on tangent bundles, the surprising result advocated in our works is that such locally anisotropic structures can be modelled equivalently on Riemann-Cartan spaces, even as exact solutions in Einstein and/or string gravity, if nonholonomic distributions and moving frames of references are introduced into consideration. We also propose a canonical scheme when geometrical objects on a (pseudo) Riemannian space are nonholonomically deformed into generalized Lagrange, or Finsler, configurations on the same manifold. Such canonical transforms are defined by the coefficients of a prime metric and generate target spaces as Lagrange structures, their models of almost Hermitian/ Kahler, or nonholonomic Riemann spaces. Finally, we consider some classes of exact solutions in string and Einstein gravity modelling Lagrange-Finsler structures with solitonic pp-waves and speculate on their physical meaning.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 19:17:04 GMT" } ]
2008-11-26T00:00:00
[ [ "Vacaru", "Sergiu I.", "" ] ]
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801.4959
John Weir
John Weir
Correspondence of the eigenvalues of a non-self-adjoint operator to those of a self-adjoint operator
29 pages, corrections to section 3, added section 5
null
10.1112/S0025579310000616
null
math.SP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We prove that the eigenvalues of a certain highly non-self-adjoint operator that arises in fluid mechanics correspond, up to scaling by a positive constant, to those of a self-adjoint operator with compact resolvent; hence there are infinitely many real eigenvalues which accumulate only at $\pm \infty$. We use this result to determine the asymptotic distribution of the eigenvalues and to compute some of the eigenvalues numerically. We compare these to earlier calculations by other authors.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 19:18:49 GMT" }, { "version": "v2", "created": "Tue, 26 Aug 2008 12:43:56 GMT" } ]
2014-01-14T00:00:00
[ [ "Weir", "John", "" ] ]
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801.496
Martin Zirnbauer
Y.V. Fyodorov, Y. Wei, M.R. Zirnbauer
Hyperbolic Hubbard-Stratonovich transformation made rigorous
21 pages, 2 figures
J. Math. Phys. 49, 053507 (2008)
10.1063/1.2917066
null
math-ph cond-mat.mes-hall math.MP
null
We revisit a long standing issue in the theory of disordered electron systems and their effective description by a non-linear sigma model: the hyperbolic Hubbard-Stratonovich (HS) transformation in the bosonic sector. For time-reversal invariant systems without spin this sector is known to have a non-compact orthogonal symmetry O(p,q). There exists an old proposal by Pruisken and Schaefer how to do the HS transformation in an O(p,q) invariant way. Giving a precise formulation of this proposal, we show that the HS integral is a sign-alternating sum of integrals over disjoint domains.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 20:02:01 GMT" }, { "version": "v2", "created": "Thu, 8 May 2008 08:03:50 GMT" } ]
2009-11-13T00:00:00
[ [ "Fyodorov", "Y. V.", "" ], [ "Wei", "Y.", "" ], [ "Zirnbauer", "M. R.", "" ] ]
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801.4961
David L. Band
David Band (CRESST/UMBC/GSFC) (for the GLAST collaboration)
The Synergy of Gamma-Ray Burst Detectors in the GLAST Era
4 pages, 2 figures, submitted to the proceedings of Gamma Ray Bursts 2007, Santa Fe, NM, November 5-9, 2007
null
10.1063/1.2943424
null
astro-ph
null
Simultaneous observations by the large number of gamma-ray burst detectors operating in the GLAST era will provide the spectra, lightcurves and locations necessary for studying burst physics and testing the putative relations between intrinsic burst properties. The detectors' energy band and the accumulation timescale of their trigger system affect their sensitivity to hard vs. soft and long vs. short bursts. Coordination of the Swift and GLAST observing plans consistent with Swift's other science objectives could increase the detection rate of GLAST bursts with redshifts.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 19:46:35 GMT" } ]
2019-08-13T00:00:00
[ [ "Band", "David", "", "CRESST/UMBC/GSFC" ] ]
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801.4962
Liang Xiao
Liang Xiao
On ramification filtrations and $p$-adic differential modules, I: equal characteristic case
Improvement on some of the proofs following the suggestion of the referee
null
null
null
math.NT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Let $k$ be a complete discretely valued field of equal characteristic $p > 0$ with possibly imperfect residue field and let $G_k$ be its Galois group. We prove that the conductors computed by the arithmetic ramification filtrations on $G_k$ coincide with the differential Artin conductors and Swan conductors of Galois representations of $G_k$. As a consequence, we give a Hasse-Arf theorem for arithmetic ramification filtrations in this case. As applications, we obtain a Hasse-Arf theorem for finite flat group schemes; we also give a comparison theorem between the differential Artin conductors and Borger's conductors.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 20:04:15 GMT" }, { "version": "v2", "created": "Sat, 15 Nov 2008 17:47:38 GMT" }, { "version": "v3", "created": "Wed, 30 Jun 2010 03:19:15 GMT" } ]
2010-07-01T00:00:00
[ [ "Xiao", "Liang", "" ] ]
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801.4963
Jo\~ao Guerra
Jo\~ao Guerra and David Nualart
Stochastic Differential Equations Driven by Fractional Brownian Motion and Standard Brownian Motion
21 pages
Stochastic Analysis and Applications, 26:5 (2008), 1053-1075
10.1080/07362990802286483
null
math.PR
null
We prove an existence and uniqueness theorem for solutions of multidimensional, time dependent, stochastic differential equations driven simultaneously by a multidimensional fractional Brownian motion with Hurst parameter H>1/2 and a multidimensional standard Brownian motion. The proof relies on some a priori estimates, which are obtained using the methods of fractional integration, and the classical Ito stochastic calculus. The existence result is based on the Yamada-Watanabe theorem.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 20:05:16 GMT" } ]
2022-01-27T00:00:00
[ [ "Guerra", "João", "" ], [ "Nualart", "David", "" ] ]
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801.4964
Juha Javanainen
Uttam Shrestha, Marijan Kostrun, and Juha Javanainen
Pulsating instability of a Bose-Einstein condensate in an optical lattice
null
null
10.1103/PhysRevLett.101.070406
null
cond-mat.other
null
We find numerically that in the limit of weak atom-atom interactions a Bose-Einstein condensate in an optical lattice may develop a pulsating dynamical instability in which the atoms nearly periodically form a peak in the occupation numbers of the lattice sites, and then return to the unstable initial state. Multiple peaks behaving similarly may also occur. Simple arguments show that the pulsating instability is a remnant of integrability, and give a handle on the relevant physical scales.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 20:14:09 GMT" } ]
2009-11-13T00:00:00
[ [ "Shrestha", "Uttam", "" ], [ "Kostrun", "Marijan", "" ], [ "Javanainen", "Juha", "" ] ]
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801.4965
Zoran Skoda
Zoran \v{S}koda
A simple algorithm for extending the identities for quantum minors to the multiparametric case
null
null
null
null
math.QA math.RA
null
For any homogeneous identity between $q$-minors, we provide an identity between $P,Q$-minors.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 20:44:49 GMT" } ]
2008-02-01T00:00:00
[ [ "Škoda", "Zoran", "" ] ]
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801.4966
Andrey O. Matveev
Andrey O. Matveev
A Note on Boolean Lattices and Farey Sequences II
9 pages; published version
INTEGERS: Electronic Journal of Combinatorial Number Theory, 8 (2008), #A24
null
null
math.NT math.CO
null
We establish monotone bijections between subsequences of the Farey sequences and the halfsequences of Farey subsequences associated with elements of the Boolean lattices.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 20:35:15 GMT" }, { "version": "v2", "created": "Wed, 5 Mar 2008 19:35:28 GMT" }, { "version": "v3", "created": "Wed, 26 Mar 2008 13:45:59 GMT" }, { "version": "v4", "created": "Mon, 28 Apr 2008 18:35:20 GMT" }, { "version": "v5", "created": "Wed, 4 Jun 2008 04:30:14 GMT" } ]
2008-06-04T00:00:00
[ [ "Matveev", "Andrey O.", "" ] ]
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801.4967
Jerzy Dydak
N.Brodskiy, J.Dydak, B.Labuz, A.Mitra
Covering maps for locally path-connected spaces
25 pages, several references added plus Proposition 4.12 and Example 4.13
null
null
null
math.GT math.AT math.GN
null
We define Peano covering maps and prove basic properties analogous to classical covers. Their domain is always locally path-connected but the range may be an arbitrary topological space. One of characterizations of Peano covering maps is via the uniqueness of homotopy lifting property for all locally path-connected spaces. Regular Peano covering maps over path-connected spaces are shown to be identical with generalized regular covering maps introduced by Fischer and Zastrow. If $X$ is path-connected, then every Peano covering map is equivalent to the projection $\widetilde X/H\to X$, where $H$ is a subgroup of the fundamental group of $X$ and $\widetilde X$ equipped with the basic topology. The projection $\widetilde X/H\to X$ is a Peano covering map if and only if it has the unique path lifting property. We define a new topology on $\widetilde X$ for which one has a characterization of $\widetilde X/H\to X$ having the unique path lifting property if $H$ is a normal subgroup of $\pi_1(X)$. Namely, $H$ must be closed in $\pi_1(X)$. Such groups include $\pi(\mathcal{U},x_0)$ ($\mathcal{U}$ being an open cover of $X$) and the kernel of the natural homomorphism from the fundamental group to the Cech fundamental group.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 20:42:58 GMT" }, { "version": "v2", "created": "Sun, 3 Feb 2008 22:20:39 GMT" }, { "version": "v3", "created": "Thu, 14 Feb 2008 18:26:04 GMT" } ]
2008-02-14T00:00:00
[ [ "Brodskiy", "N.", "" ], [ "Dydak", "J.", "" ], [ "Labuz", "B.", "" ], [ "Mitra", "A.", "" ] ]
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801.4968
Melissa Graham
M.L. Graham, C.J. Pritchet, M. Sullivan, S.D.J. Gwyn, J.D. Neill, E.Y. Hsiao, P. Astier, D. Balam, C. Balland, S. Basa, R.G. Carlberg, A. Conley, D. Fouchez, J. Guy, D. Hardin, I.M. Hook, D.A. Howell, R. Pain, K. Perrett, N. Regnault, S. Baumont, J. Le Du, C. Lidman, S. Perlmutter, P. Ripoche, N. Suzuki, E.S. Walker, T. Zhang
Type Ia Supernovae Rates and Galaxy Clustering from the CFHT Supernova Legacy Survey
21 pages, 2 figures, 6 tables, accepted for publication in AJ
Astron.J.135:1343-1349,2008
10.1088/0004-6256/135/4/1343
null
astro-ph
null
The Canada-France-Hawaii Telescope Supernova Legacy Survey (SNLS) has created a large homogeneous database of intermediate redshift (0.2 < z < 1.0) type Ia supernovae (SNe Ia). The SNLS team has shown that correlations exist between SN Ia rates, properties, and host galaxy star formation rates. The SNLS SN Ia database has now been combined with a photometric redshift galaxy catalog and an optical galaxy cluster catalog to investigate the possible influence of galaxy clustering on the SN Ia rate, over and above the expected effect due to the dependence of SFR on clustering through the morphology-density relation. We identify three cluster SNe Ia, plus three additional possible cluster SNe Ia, and find the SN Ia rate per unit mass in clusters at intermediate redshifts is consistent with the rate per unit mass in field early-type galaxies and the SN Ia cluster rate from low redshift cluster targeted surveys. We also find the number of SNe Ia in cluster environments to be within a factor of two of expectations from the two component SNIa rate model.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 20:47:07 GMT" } ]
2010-04-21T00:00:00
[ [ "Graham", "M. L.", "" ], [ "Pritchet", "C. J.", "" ], [ "Sullivan", "M.", "" ], [ "Gwyn", "S. D. J.", "" ], [ "Neill", "J. D.", "" ], [ "Hsiao", "E. Y.", "" ], [ "Astier", "P.", "" ], [ "Balam", "D.", "" ], [ "Balland", "C.", "" ], [ "Basa", "S.", "" ], [ "Carlberg", "R. G.", "" ], [ "Conley", "A.", "" ], [ "Fouchez", "D.", "" ], [ "Guy", "J.", "" ], [ "Hardin", "D.", "" ], [ "Hook", "I. M.", "" ], [ "Howell", "D. A.", "" ], [ "Pain", "R.", "" ], [ "Perrett", "K.", "" ], [ "Regnault", "N.", "" ], [ "Baumont", "S.", "" ], [ "Du", "J. Le", "" ], [ "Lidman", "C.", "" ], [ "Perlmutter", "S.", "" ], [ "Ripoche", "P.", "" ], [ "Suzuki", "N.", "" ], [ "Walker", "E. S.", "" ], [ "Zhang", "T.", "" ] ]
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801.4969
Stefano Marchesini
S. Marchesini, S. Boutet, A. E. Sakdinawat, M. J. Bogan, S. Bajt, A. Barty, H. N. Chapman, M. Frank, S. P. Hau-Riege, A. Szoke, C. Cui, M. R. Howells, D. A. Shapiro, J. C. H. Spence, J. W. Shaevitz, J. Y. Lee, J. Hajdu, M. M. Seibert
Ultrafast, ultrabright, X-ray holography using a uniformly-redundant array
5 pages, 3 figures, revtex
Nature Photonics 2, 560 - 563 (2008)
10.1038/nphoton.2008.154
UCRL-JRNL-234707
physics.optics
null
Advances in the development of free-electron lasers offer the realistic prospect of high-resolution imaging to study the nanoworld on the time-scale of atomic motions. We identify X-ray Fourier Transform holography, (FTH) as a promising but, so far, inefficient scheme to do this. We show that a uniformly redundant array (URA) placed next to the sample, multiplies the efficiency of X-ray FTH by more than one thousand (approaching that of a perfect lens) and provides holographic images with both amplitude- and phase-contrast information. The experiments reported here demonstrate this concept by imaging a nano-fabricated object at a synchrotron source, and a bacterial cell at a soft X-ray free-electron-laser, where illumination by a single 15 fs pulse was successfully used in producing the holographic image. We expect with upcoming hard X-ray lasers to achieve considerably higher spatial resolution and to obtain ultrafast movies of excited states of matter.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 20:51:21 GMT" }, { "version": "v2", "created": "Thu, 31 Jan 2008 21:39:03 GMT" }, { "version": "v3", "created": "Sat, 9 Feb 2008 01:14:21 GMT" } ]
2008-09-04T00:00:00
[ [ "Marchesini", "S.", "" ], [ "Boutet", "S.", "" ], [ "Sakdinawat", "A. E.", "" ], [ "Bogan", "M. J.", "" ], [ "Bajt", "S.", "" ], [ "Barty", "A.", "" ], [ "Chapman", "H. N.", "" ], [ "Frank", "M.", "" ], [ "Hau-Riege", "S. P.", "" ], [ "Szoke", "A.", "" ], [ "Cui", "C.", "" ], [ "Howells", "M. R.", "" ], [ "Shapiro", "D. A.", "" ], [ "Spence", "J. C. H.", "" ], [ "Shaevitz", "J. W.", "" ], [ "Lee", "J. Y.", "" ], [ "Hajdu", "J.", "" ], [ "Seibert", "M. M.", "" ] ]
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801.497
Ulrich Mosel
Ulrich Mosel
Hadrons in Medium -- Theory meets Experiment
Invited talk at MENU07, Juelich, Germany, Sept. 2007; ref added
ECONFC070910:121,2007
null
null
hep-ph nucl-ex nucl-th
null
In this talk I give a short review of theoretical results on the properties of hadrons in cold, equilibrium nuclear matter. I then discuss the observable consequences of any changes of these properties inside the medium in actual experiments. I demonstrate that any experimental verification of in-medium effects requires a state-of-the-art treatment of the reaction dynamics and, in particular, also the final state interactions.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 20:51:37 GMT" }, { "version": "v2", "created": "Mon, 7 Apr 2008 12:42:42 GMT" } ]
2008-11-26T00:00:00
[ [ "Mosel", "Ulrich", "" ] ]
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802.0001
Elena D'Onghia
Elena D'Onghia (1), George Lake (1) ((1) University of Zurich)
Small Dwarf Galaxies Within Larger Dwarfs: Why Some Are Luminous While Most Go Dark
ApJ Letters in press
null
10.1086/592995
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider the possibility that the Magellanic Clouds were the largest members of a group of dwarf galaxies that entered the Milky Way (MW) halo at late times. Seven of the eleven brightest satellites of the MW may have been part of this system. The proximity of some dwarfs to the plane of the orbit of the Large Magellanic Cloud (LMC) has been used to argue that they formed from tidal debris from the LMC and Small Magellanic Cloud (SMC). Instead, they may owe to the tidal breakup of the Magellanic Group. This can explain the association of many of the dwarf galaxies in the Local Group with the LMC system. It provides a mechanism for lighting up dwarf galaxies and reproduces the bright end of the cumulative circular velocity distribution of the satellites in the MW without invoking a stripping scenario for the subhalos to match the satellite distribution expected according to CDM theory. Finally, our model predicts that other isolated dwarfs will be found to have companions. Evidence for this prediction is provided by nearby, recently discovered dwarf associations.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 21:00:04 GMT" }, { "version": "v2", "created": "Thu, 24 Jul 2008 07:52:18 GMT" }, { "version": "v3", "created": "Mon, 22 Sep 2008 21:13:32 GMT" } ]
2009-11-13T00:00:00
[ [ "D'Onghia", "Elena", "", "University of Zurich" ], [ "Lake", "George", "", "University of Zurich" ] ]
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802.0002
Masamune Oguri
Masamune Oguri, Eran O. Ofek, Naohisa Inada, Tomoki Morokuma, Emilio E. Falco, Christopher S. Kochanek, Issha Kayo, Tom Broadhurst, Gordon T. Richards
The Third Image of the Large-Separation Lensed Quasar SDSS J1029+2623
5 pages, 3 figures, accepted for publication in ApJ Letters
Astrophys.J.676:L1-L4,2008
10.1086/586897
SLAC-PUB-13109
astro-ph
null
We identify a third image in the unique quasar lens SDSS J1029+2623, the second known quasar lens produced by a massive cluster of galaxies. The spectrum of the third image shows similar emission and absorption features, but has a redder continuum than the other two images which can be explained by differential extinction or microlensing. We also identify several lensed arcs. Our observations suggest a complicated structure of the lens cluster at z~0.6. We argue that the three lensed images are produced by a naked cusp on the basis of successful mass models, the distribution of cluster member galaxies, and the shapes and locations of the lensed arcs. Lensing by a naked cusp is quite rare among galaxy-scale lenses but is predicted to be common among large-separation lensed quasars. Thus the discovery can be viewed as support for an important theoretical prediction of the standard cold dark matter model.
[ { "version": "v1", "created": "Thu, 31 Jan 2008 21:00:59 GMT" } ]
2009-11-13T00:00:00
[ [ "Oguri", "Masamune", "" ], [ "Ofek", "Eran O.", "" ], [ "Inada", "Naohisa", "" ], [ "Morokuma", "Tomoki", "" ], [ "Falco", "Emilio E.", "" ], [ "Kochanek", "Christopher S.", "" ], [ "Kayo", "Issha", "" ], [ "Broadhurst", "Tom", "" ], [ "Richards", "Gordon T.", "" ] ]
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