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801.0473
Fen Zuo
Tao Huang, Zuo-Hong Li, Xing-Gang Wu and Fen Zuo
Semileptonic $B(B_s, B_c)$ decays in the light-cone QCD sum rules
8 pages, talk given by the first arthur at 4th International Conference on Flavor Physics (ICFP 2007), Beijing, China, Sept 24-28, 2007
Int.J.Mod.Phys.A23:3237-3245,2008
10.1142/S0217751X0804189X
null
hep-ph
null
Semileptonic $B$($B_s, B_c$) decays are investigated systematically in the light-cone QCD sum rules. Special emphasis is put on the LCSR calculation on weak form factors with an adequate chiral current correlator, which turns out to be particularly effective to control the pollution by higher twist components of spectator mesons. The result for each channel depends on the distribution amplitude of the the producing meson. The leading twist distribution amplitudes of the related heavy mesons and charmonium are worked out by a model approach in the reasonable way. A practical scenario is suggested to understand the behavior of weak form factors in the whole kinematically accessible ranges. The decay widths and branching ratios are estimated for several $B$($B_c$) decay modes of current interest.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 04:21:48 GMT" }, { "version": "v2", "created": "Tue, 8 Jan 2008 07:11:10 GMT" } ]
2008-11-26T00:00:00
[ [ "Huang", "Tao", "" ], [ "Li", "Zuo-Hong", "" ], [ "Wu", "Xing-Gang", "" ], [ "Zuo", "Fen", "" ] ]
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801.0474
Christopher Clingerman
Christopher Clingerman, Jeremiah Hemphill, Corey Proscia
Analysis and Counterexamples Regarding Yatsenko's Polynomial-Time Algorithm for Solving the Traveling Salesman Problem
10 pages, 8 figures, references arXiv:cs/0702133
null
null
null
cs.CC
null
Yatsenko gives a polynomial-time algorithm for solving the traveling salesman problem. We examine the correctness of the algorithm and its construction. We also comment on Yatsenko's evaluation of the algorithm.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 04:46:16 GMT" } ]
2008-01-04T00:00:00
[ [ "Clingerman", "Christopher", "" ], [ "Hemphill", "Jeremiah", "" ], [ "Proscia", "Corey", "" ] ]
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801.0475
Saijun Wu
Saijun Wu, Alexey Tonyushkin, Mara G. Prentiss
Observation of coherence revival and fidelity saturation in a delta-kicked rotor potential
10 pages, 3 figures. Minor revisions
null
10.1103/PhysRevLett.103.034101
null
physics.atom-ph physics.gen-ph
null
We experimentally investigate the effect of atomic $\delta$-kicked rotor potentials on the mutual coherence between wavepackets in an atom interferometer. The differential action of the kicked rotor degrades the mutual coherence, leading to a reduction of the interferometry fringe visibility; however, when the repetition rate of the kicked rotor is at or near the quantum resonance, we observe revival of matter-wave coherence as the number of kicks increases, resulting in non-vanishing coherence in the large kick number limit. This coherence saturation effect reflects a saturation of fidelity decay due to momentum displacements in deep quantum regime. The saturation effect is accompanied with an invariant distribution of matter-wave coherence under the kicked rotor perturbations.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 04:37:32 GMT" }, { "version": "v2", "created": "Fri, 22 Feb 2008 03:06:43 GMT" }, { "version": "v3", "created": "Sun, 24 Feb 2008 06:43:52 GMT" } ]
2013-05-29T00:00:00
[ [ "Wu", "Saijun", "" ], [ "Tonyushkin", "Alexey", "" ], [ "Prentiss", "Mara G.", "" ] ]
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801.0476
Bayram Tekin
Aaron Katzenmeyer, Logeeswaran VJ, Bayram Tekin and M. Saif Islam
Impact of Casimir Force in Molecular Electronic Switching Junctions
4 pages, pdf
null
null
null
cond-mat.mtrl-sci cond-mat.other
null
Despite significant progress in synthesizing several new molecules and many promising single device demonstrations, wide range acceptance of molecular electronics as an alternative to CMOS technology has been stalled not only by controversial theories of a molecular device`s operation, for example the switching mechanism, but also by our inability to reproducibly fabricate large arrays of devices. In this paper, we investigate the role of Casimir force as one of the potential source of a wide range of discrepancies in the reported electrical characteristics and high rate of device shorting in molecular electronic switching junctions fabricated by sandwiching a molecular monolayer between a pair of planar metal electrode.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 04:54:11 GMT" } ]
2008-01-04T00:00:00
[ [ "Katzenmeyer", "Aaron", "" ], [ "VJ", "Logeeswaran", "" ], [ "Tekin", "Bayram", "" ], [ "Islam", "M. Saif", "" ] ]
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801.0477
Chang-Hwan Lee
G.E. Brown, C.-H. Lee, E. Moreno Mendez
LMC X-3 May Be a Relic of a GRB Similar to Cosmological GRBs
7 pages, 3 figures
null
10.1086/591637
null
astro-ph
null
The present scenario for high-luminosity long gamma-ray bursts is strongly influenced by the paper of Fruchter et al. (2006). Whereas the main contention of this paper that these GRBs occur in low-metallicity irregular galaxies is based on a considerable collection of observational results and although the main thesis is doubtless correct, the paper does not explain the dynamics that produces such GRBs and much of the discussion not directly concerning the main thesis is wrong. We propose a dynamics and elucidate how the Fruchter et al. (2006) results may be tested, in our neighborhood in the LMC, suggesting that LMC X-3 is a relic of a high luminosity explosion, probably accompanied by a GRB and hypernova explosion. The way to test our suggestion is to measure the system velocity of the present black hole. We correct errors of the Fruchter et al. paper in stellar evolution, so that the study of GRBs is consistent with it. We show that the subluminous GRB 060218 had a low-mass black hole as central engine.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 05:17:41 GMT" } ]
2009-11-13T00:00:00
[ [ "Brown", "G. E.", "" ], [ "Lee", "C. -H.", "" ], [ "Mendez", "E. Moreno", "" ] ]
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801.0478
Piyush Kumar
Bobby S. Acharya, Konstantin Bobkov, Gordon L. Kane, Piyush Kumar, Jing Shao
The $G_2$-MSSM - An $M$ Theory motivated model of Particle Physics
42 pages, 7 figures, one figure corrected, reference added
Phys.Rev.D78:065038,2008
10.1103/PhysRevD.78.065038
null
hep-ph hep-th
null
We continue our study of the low energy implications of $M$ theory vacua on $G_2$ manifolds, undertaken in \cite{Acharya:2007rc,Acharya:2006ia}, where it was shown that the moduli can be stabilized and a TeV scale generated, with the Planck scale as the only dimensionful input. A well-motivated phenomenological model - the $G_2$-MSSM, can be naturally defined within the above framework. In this paper, we study some of the important phenomenological features of the $G_2$-MSSM. In particular, the soft supersymmetry breaking parameters and the superpartner spectrum are computed. The $G_2$-MSSM generically gives rise to light gauginos and heavy scalars with wino LSPs when one tunes the cosmological constant. Electroweak symmetry breaking is present but fine-tuned. The $G_2$-MSSM is also naturally consistent with precision gauge coupling unification. The phenomenological consequences for cosmology and collider physics of the $G_2$-MSSM will be reported in more detail soon.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 05:36:16 GMT" }, { "version": "v2", "created": "Mon, 7 Jan 2008 23:28:16 GMT" } ]
2008-11-26T00:00:00
[ [ "Acharya", "Bobby S.", "" ], [ "Bobkov", "Konstantin", "" ], [ "Kane", "Gordon L.", "" ], [ "Kumar", "Piyush", "" ], [ "Shao", "Jing", "" ] ]
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801.0479
Francois Renard
Karen Mair (PGP), Fran\c{c}ois Renard (PGP, LGIT), Olav Gundersen (PGP)
Thermal imaging on simulated faults during frictional sliding
null
Geophysical Research Letters 33 (2006) L19301
10.1029/2006GL027143
null
physics.geo-ph
null
Heating during frictional sliding is a major component of the energy budget of earthquakes and represents a potential weakening mechanism. It is therefore important to investigate how heat dissipates during sliding on simulated faults. We present results from laboratory friction experiments where a halite (NaCl) slider held under constant load is dragged across a coarse substrate. Surface evolution and frictional resistance are recorded. Heat emission at the sliding surface is monitored using an infra-red camera. We demonstrate a link between plastic deformations of halite and enhanced heating characterized by transient localized heat spots. When sand 'gouge' is added to the interface, heating is more diffuse. Importantly, when strong asperities concentrate deformation, significantly more heat is produced locally. In natural faults such regions could be nucleation patches for melt production and hence potentially initiate weakening during earthquakes at much smaller sliding velocities or shear stress than previously thought.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 15:04:50 GMT" } ]
2008-01-04T00:00:00
[ [ "Mair", "Karen", "", "PGP" ], [ "Renard", "François", "", "PGP, LGIT" ], [ "Gundersen", "Olav", "", "PGP" ] ]
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801.048
Taekyun Kim
T. Kim
Analytic Continuation of q-Euler numbers and polynomials
5 pages
null
null
null
math.NT
null
In this paper we study that the $q$-Euler numbers and polynomials are analytically continued to $E_q(s)$. A new formula for the Euler's $q$-Zeta function $\zeta_{E,q}(s)$ in terms of nested series of $\zeta_{E,q}(n)$ is derived. Finally we introduce the new concept of the dynamics of analytically continued $q$-Euler numbers and polynomials.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 06:13:04 GMT" } ]
2008-01-04T00:00:00
[ [ "Kim", "T.", "" ] ]
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801.0481
Scott Kominers
Scott D. Kominers
On Universal Binary Hermitian Forms
5 pages
INTEGERS: The Electronic Journal of Combinatorial Number Theory 9, (2009), #A02
null
null
math.NT
null
Earnest and Khosravani, Iwabuchi, and Kim and Park recently gave a complete classification of the universal binary Hermitian forms. We give a unified proof of the universalities of these Hermitian forms, relying primarily on Ramanujan's list of universal quadratic forms and on the Bhargava-Hanke 290-Theorem. Our methods bypass nearly all of the ad hoc universality arguments required in the original classification.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 06:52:41 GMT" } ]
2011-11-11T00:00:00
[ [ "Kominers", "Scott D.", "" ] ]
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801.0482
Jungjai Lee
Gungwon Kang, Hyeong-Chan Kim, and Jungjai Lee
Geometrical properties of the trans-spherical solutions in higher dimensions
14 pages, 2 figures, Title changed
Phys. Rev. D 79, 124030 (2009)
10.1103/PhysRevD.79.124030
KIAS-0801
gr-qc hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We investigate the geometrical properties of static vacuum $p$-brane solutions of Einstein gravity in $D=n+p+3$ dimensions, which have spherical symmetry of $S^{n+1}$ orthogonal to the $p$-directions and are invariant under the translation along them. % The solutions are characterized by mass density and $p$ tension densities. % The causal structure of the higher dimensional solutions is essentially the same as that of the five dimensional ones. Namely, a naked singularity appears for most solutions except for the Schwarzschild black $p$-brane and the Kaluza-Klein bubble. % We show that some important geometric properties such as the area of $S^{n+1}$ and the total spatial volume are characterized only by the three parameters such as the mass density, the sum of tension densities and the sum of tension density squares rather than individual tension densities. These geometric properties are analyzed in detail in this parameter space and are compared with those of 5-dimensional case.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 07:02:29 GMT" }, { "version": "v2", "created": "Sun, 30 Nov 2008 10:55:52 GMT" }, { "version": "v3", "created": "Wed, 27 May 2009 12:44:00 GMT" } ]
2009-07-31T00:00:00
[ [ "Kang", "Gungwon", "" ], [ "Kim", "Hyeong-Chan", "" ], [ "Lee", "Jungjai", "" ] ]
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801.0483
Mahdou Najib
Driss Bennis and Najib Mahdou
Global Gorenstein dimensions of polynomial rings and of direct products of rings
null
null
null
null
math.AC
null
In this paper, we extend the well-known Hilbert's syzygy theorem to the Gorenstein homological dimensions of rings. Also, we study the Gorenstein homological dimensions of direct products of rings. Our results generate examples of non-Noetherian rings of finite Gorenstein dimensions and infinite classical weak dimension.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 07:27:40 GMT" } ]
2008-01-04T00:00:00
[ [ "Bennis", "Driss", "" ], [ "Mahdou", "Najib", "" ] ]
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801.0484
Shingo Yonezawa
Shingo Yonezawa, S. Kusaba, Y. Maeno, P. Auban-Senzier, C. Pasquier, K. Bechgaard, D. J\'erome
Anomalous In-Plane Anisotropy of the Onset of Superconductivity in (TMTSF)2ClO4
4 pages, 4 figures
Physical Review Letters vol.100, 117002 (2008)
10.1103/PhysRevLett.100.117002
null
cond-mat.supr-con
null
We report the magnetic field-amplitude and field-angle dependence of the superconducting onset temperature Tc_onset of the organic superconductor (TMTSF)2ClO4 in magnetic fields H accurately aligned to the conductive ab' plane. We revealed that the rapid increase of the onset fields at low temperatures occurs both for H // b' and H // a, irrespective of the carrier confinement. Moreover, in the vicinity of the Pauli limiting field, we report a shift of a principal axis of the in-plane field-angle dependence of Tc_onset away from the b' axis. This feature may be related to an occurrence of Fulde-Ferrell-Larkin-Ovchinnikov phases.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 07:27:44 GMT" } ]
2008-03-19T00:00:00
[ [ "Yonezawa", "Shingo", "" ], [ "Kusaba", "S.", "" ], [ "Maeno", "Y.", "" ], [ "Auban-Senzier", "P.", "" ], [ "Pasquier", "C.", "" ], [ "Bechgaard", "K.", "" ], [ "Jérome", "D.", "" ] ]
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801.0485
Oleg I. Berngardt
K.V. Grkovich, O.I. Berngardt
Towards determining the parameters of layer with scattering irregularities that cause coherent echo, based on the Irkutsk Incoherent Scatter radar data
8 pages, 7 figures
null
null
null
physics.geo-ph physics.ao-ph physics.plasm-ph
null
In the paper we have presented a technique of determining the scattering irregularities (that cause coherent echo) layer parameters using the Irkutsk IS radar data. It is shown that our technique has necessary accuracy (for height and thickness - about 2.5 km, for aspect sensitivity - 5dB/degree). Processing of the experiments 25-26.12.1998 and 15-16.07.2000 has shown a good agreement of data calculated with the data obtained by other investigators: an average layer height is 110-120km, average layer thickness 5km, average aspect sensitivity - 15dB/degree. The investigation of the experiments with high temporal resolution allowed us to observe temporal variations of the irregularities layer parameters. The average thickness and height of the layer does not contradict the data obtained by other investigators. The investigation of the experiments with high temporal resolution allowed to detect time variations of the layer parameters. The temporal variations of the aspect sensitivity are observed by us for the first time and requires additional investigations.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 07:44:58 GMT" } ]
2008-01-04T00:00:00
[ [ "Grkovich", "K. V.", "" ], [ "Berngardt", "O. I.", "" ] ]
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801.0486
Tsuyoshi Inoue
Tsuyoshi Inoue and Shu-ichiro Inutsuka
Two-Fluid MHD Simulations of Converging HI Flows in the Interstellar Medium. I: Methodology and Basic Results
ApJ accepted
Astrophys.J.687:303-310, 2008
10.1086/590528
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We develop an unconditionally stable numerical method for solving the coupling between two fluids (frictional forces/heatings, ionization, and recombination), and investigate the dynamical condensation process of thermally unstable gas that is provided by the shock waves in a weakly ionized and magnetized interstellar medium by using two-dimensional two-fluid magnetohydrodynamical simulations. If we neglect the effect of magnetic field, it is known that condensation driven by thermal instability can generate high density clouds whose physical condition corresponds to molecular clouds (precursor of molecular clouds). In this paper, we study the effect of magnetic field on the evolution of supersonic converging HI flows and focus on the case in which the orientation of magnetic field to converging flows is orthogonal. We show that the magnetic pressure gradient parallel to the flows prevents the formation of high density and high column density clouds, but instead generates fragmented, filamentary HI clouds. With this restricted geometry, magnetic field drastically diminishes the opportunity of fast molecular cloud formation directly from the warm neutral medium, in contrast to the case without magnetic field.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 08:45:14 GMT" }, { "version": "v2", "created": "Wed, 3 Sep 2008 05:43:40 GMT" } ]
2010-12-20T00:00:00
[ [ "Inoue", "Tsuyoshi", "" ], [ "Inutsuka", "Shu-ichiro", "" ] ]
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801.0487
Saidur Rahaman
S. Rahaman, V.-V. Elomaa, T. Eronen, U. Hager, J. Hakala, A. Jokinen, A. Kankainen, J. Rissanen, C. Weber, J. Aysto and the IGISOL group
Mass measurements of neutron-rich nuclei at JYFLTRAP
7 pages 3 pictures, Accepted for Publication Acta Phys Polonica, XXX Mazurian lake conf. proc
ActaPhys.Polon.B39:463-470,2008
null
null
nucl-ex
null
The JYFLTRAP mass spectrometer was used to measure the masses of neutron-rich nuclei in the region between N = 28 to N = 82 with uncertainties better than 10 keV. The impacts on nuclear structure and the r-process paths are reviewed.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 08:24:16 GMT" } ]
2008-11-26T00:00:00
[ [ "Rahaman", "S.", "" ], [ "Elomaa", "V. -V.", "" ], [ "Eronen", "T.", "" ], [ "Hager", "U.", "" ], [ "Hakala", "J.", "" ], [ "Jokinen", "A.", "" ], [ "Kankainen", "A.", "" ], [ "Rissanen", "J.", "" ], [ "Weber", "C.", "" ], [ "Aysto", "J.", "" ], [ "group", "the IGISOL", "" ] ]
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801.0488
Johannes Kestler
Johannes Kestler, Evi Kopelowitz, Ido Kanter, Wolfgang Kinzel
Patterns of Chaos Synchronization
null
null
10.1103/PhysRevE.77.046209
null
nlin.CD
null
Small networks of chaotic units which are coupled by their time-delayed variables, are investigated. In spite of the time delay, the units can synchronize isochronally, i.e. without time shift. Moreover, networks can not only synchronize completely, but can also split into different synchronized sublattices. These synchronization patterns are stable attractors of the network dynamics. Different networks with their associated behaviors and synchronization patterns are presented. In particular, we investigate sublattice synchronization, symmetry breaking, spreading chaotic motifs, synchronization by restoring symmetry and cooperative pairwise synchronization of a bipartite tree.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 08:26:23 GMT" } ]
2009-11-13T00:00:00
[ [ "Kestler", "Johannes", "" ], [ "Kopelowitz", "Evi", "" ], [ "Kanter", "Ido", "" ], [ "Kinzel", "Wolfgang", "" ] ]
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801.0489
Qiu-he Peng
Hao Tong, Qiu-he Peng and Hua Bai
Microscopic magnetic dipole radiation in neutron stars
To be published by ChJAA
null
10.1088/1009-9271/8/3/04
null
astro-ph
null
There is ${}^3P_2$ neutron superfluid region in NS (neutron star) interior. For a rotating NS, the ${}^3P_2$ superfluid region is like a system of rotating magnetic dipoles. It will give out electromagnetic radiation, which may provides a new heating mechanism of NSs. This heating mechanism plus some cooling agent may give sound explanation to NS glitches.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 08:27:03 GMT" } ]
2009-11-13T00:00:00
[ [ "Tong", "Hao", "" ], [ "Peng", "Qiu-he", "" ], [ "Bai", "Hua", "" ] ]
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801.049
Jean-Pierre Lasota
Jean-Pierre Lasota (Institut d'Astrophysique de Paris)
ADAFs, accretion discs and outbursts in compact binaries
To be published in New Astronomy Review (Proceedings of the meeting "JPL, X-ray binaries, accretion disks and compact stars", October 2007, Editor: M.A. Abramowicz), Eq. (2) corrected
New Astron.Rev.51:752-758,2008
10.1016/j.newar.2008.03.003
null
astro-ph
null
I discuss the status of the Soft X-ray Transient model. First, I discuss and then compare with observations the assumption that the geometrically thin disc evaporates into an ADAF. Second, I address the problems created by the recent determinations of the distance to SS Cyg, according to which the Disc Instability Model does not apply to this famous dwarf-nova, thus casting doubt on the application of this model to any system at all.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 12:18:39 GMT" }, { "version": "v2", "created": "Sun, 10 Feb 2008 15:29:07 GMT" } ]
2009-06-23T00:00:00
[ [ "Lasota", "Jean-Pierre", "", "Institut d'Astrophysique de Paris" ] ]
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801.0491
Ki-Young Choi
Ki-Young Choi, Jihn E. Kim, Hyun Min Lee, Osamu Seto
Neutralino dark matter from heavy axino decay
7 pages, 4 figures; references added, published version in Phys. Rev. D
Phys.Rev.D77:123501,2008
10.1103/PhysRevD.77.123501
IFT-UAM/CSIC -08-01
hep-ph astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider cosmological consequences of a heavy axino, decaying to the neutralino in R-parity conserving models. The importance and influence of the axino decay on the resultant abundance of neutralino dark matter depends on the lifetime and the energy density of axino. For a high reheating temperature after inflation, copiously produced axinos dominate the energy density of the universe and its decay produces a large amount of entropy. As a bonus, we obtain that the upper bound on the reheating temperature after inflation via gravitino decay can be moderated, because the entropy production by the axino decay more or less dilutes the gravitinos.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 08:38:49 GMT" }, { "version": "v2", "created": "Thu, 19 Jun 2008 12:52:43 GMT" } ]
2008-06-19T00:00:00
[ [ "Choi", "Ki-Young", "" ], [ "Kim", "Jihn E.", "" ], [ "Lee", "Hyun Min", "" ], [ "Seto", "Osamu", "" ] ]
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801.0492
S. T. Megeath
S. T. Megeath (U. Toledo), Zhi-Yun Li (U. Virginia), Aake Nordlund (Niels Bohr Institute)
The Formation of Distributed and Clustered Stars in Molecular Clouds
for the proceedings of "Structure formation in the Universe" held in Chamonix, France on May 27 to June 1 2007
null
null
null
astro-ph
null
During the last two decades, the focus of star formation research has shifted from understanding the collapse of a single dense core into a star to studying the formation hundreds to thousands of stars in molecular clouds. In this chapter, we overview recent observational and theoretical progress toward understanding star formation on the scale of molecular clouds and complexes, i.e the macrophysics of star formation. We begin with an overview of recent surveys of young stellar objects (YSOs) in molecular clouds and embedded clusters, and we outline an emerging picture of cluster formation. We then discuss the role of turbulence to both support clouds and create dense, gravitationally unstable structures, with an emphasis on the role of magnetic fields (in the case of distributed stars) and feedback (in the case of clusters) to slow turbulent decay and mediate the rate and density of star formation. The discussion is followed by an overview of how gravity and turbulence may produce observed scaling laws for the properties of molecular clouds, stars and star clusters, and how the observed, low star formation rate may result from self regulated star formation. We end with some concluding remarks, including a number of questions to be addressed by future observations and simulations.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 13:35:38 GMT" } ]
2008-01-04T00:00:00
[ [ "Megeath", "S. T.", "", "U. Toledo" ], [ "Li", "Zhi-Yun", "", "U. Virginia" ], [ "Nordlund", "Aake", "", "Niels Bohr Institute" ] ]
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801.0493
Mikhail Braun
M. A. Braun
Single and double inclusive cross-sections for nucleus-nucleus collisions in the peryrbative QCD
15 pages, 2 figures
Eur.Phys.J.C55:377-386,2008
10.1140/epjc/s10052-008-0589-3
null
hep-ph
null
Single and double inclusive cross-sections in nucleus-nucleus collisions are derived in the perturbative QCD with interacting BFKL pomerons in the quasi-classical approximation.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 09:36:39 GMT" } ]
2008-11-26T00:00:00
[ [ "Braun", "M. A.", "" ] ]
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801.0494
Michele Tumminello
Michele Tumminello, Francesco Ciccarello
Atomic teleportation via cavity QED and position measurements: efficiency analysis
8 pages, 1 figure, 1 table
Eur. Phys. J. Special Topics 160, 411-419 (2008)
10.1140/epjst/e2008-00744-5
null
quant-ph
null
We have recently presented a novel protocol to teleport an unknown atomic state via cavity QED and position measurements. Here, after a brief review of our scheme, we provide a quantitative study of its efficiency. This is accomplished by an explicit description of the measurement process that allows us to derive the fidelity with respect to the atomic internal state to be teleported.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 09:47:56 GMT" } ]
2008-06-24T00:00:00
[ [ "Tumminello", "Michele", "" ], [ "Ciccarello", "Francesco", "" ] ]
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801.0495
Matthias Lenz
Matthias Lenz
Toric Ideals of Flow Polytopes
Withdrawn due to an error in the proof of the Main Theorem
null
null
null
math.CO math.AC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A referee found an error in the proof of the Main Theorem ("toric ideals of flow polytopes are generated in degree 3") that we could not fix. More precisely, the proof of Lemma 4.2.(ii) is incorrect. The results on Gr\"obner bases are untouched by this. ----- We show that toric ideals of flow polytopes are generated in degree 3. This was conjectured by Diaconis and Eriksson for the special case of the Birkhoff polytope. Our proof uses a hyperplane subdivision method developed by Haase and Paffenholz. It is known that reduced revlex Gr\"obner bases of the toric ideal of the Birkhoff polytope $B_n$ have at most degree $n$. We show that this bound is sharp for some revlex term orders. For $(m\times n)$-transportation polytopes, a similar result holds: they have Gr\"obner bases of at most degree $\lfloor mn/2\rfloor$. We construct a family of examples, where this bound is sharp.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 11:51:31 GMT" }, { "version": "v2", "created": "Sat, 31 Jul 2010 16:54:13 GMT" }, { "version": "v3", "created": "Fri, 4 Mar 2011 12:34:35 GMT" } ]
2011-03-07T00:00:00
[ [ "Lenz", "Matthias", "" ] ]
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801.0496
Benedetta Ferrario
B. Ferrario
Some examples of absolute continuity of measures in stochastic fluid dynamics
16 pages
null
null
null
math.PR
null
A non linear Ito equation in a Hilbert space is studied by means of Girsanov theorem. We consider a non linearity of polynomial growth in suitable norms, including that of quadratic type which appears in the Kuramoto-Sivashinsky equation and in the Navier-Stokes equation. We prove that Girsanov theorem holds for the 1-dimensional stochastic Kuramoto-Sivashinsky equation and for a modification of the 2- and 3-dimensional stochastic Navier-Stokes equation. In this way, we prove existence and uniqueness of solutions for these stochastic equations. Moreover, the asymptotic behaviour for large time is characterized.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 10:01:11 GMT" } ]
2008-01-04T00:00:00
[ [ "Ferrario", "B.", "" ] ]
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801.0497
Avatar Tulsi
Avatar Tulsi
Faster quantum walk algorithm for the two dimensional spatial search
7 pages, 1 figure. Accepted for publication in PRA
null
10.1103/PhysRevA.78.012310
null
quant-ph
null
We consider the problem of finding a desired item out of $N$ items arranged on the sites of a two-dimensional lattice of size $\sqrt{N} \times \sqrt{N}$. The previous quantum walk based algorithms take $O(\sqrt{N}\log N)$ steps to solve this problem, and it is an open question whether the performance can be improved. We present a new algorithm which solves the problem in $O(\sqrt{N\log N})$ steps, thus giving an $O(\sqrt{\log N})$ improvement over the known algorithms. The improvement is achieved by controlling the quantum walk on the lattice using an ancilla qubit.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 10:11:26 GMT" }, { "version": "v2", "created": "Mon, 2 Jun 2008 20:38:38 GMT" } ]
2009-11-13T00:00:00
[ [ "Tulsi", "Avatar", "" ] ]
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801.0498
S. Mallik
S. Mallik, J. N. De, S.K. Samaddar, Sourav Sarkar
S-matrix approach to equation of state of nuclear matter
Version to appear in PRC, Rapid Communications
Phys.Rev.C77:032201,2008
10.1103/PhysRevC.77.032201
null
nucl-th
null
We calculate the equation of state of nuclear matter based on the general analysis of the grand canonical partition function in the $S$-matrix framework. In addition to the low mass stable particles and their two-body scattering channels considered earlier, the calculation includes systematically all the higher mass particles and their exited states as well as the scattering channels formed by any number of these species. We estimate the latter contribution by resonances in all the channels. The resulting model-independent virial series for pressure gets substantial contribution from the heavy particles and the channels containing them. The series converges for larger values of baryon density than found earlier.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 10:17:18 GMT" }, { "version": "v2", "created": "Tue, 18 Mar 2008 09:17:19 GMT" } ]
2008-11-26T00:00:00
[ [ "Mallik", "S.", "" ], [ "De", "J. N.", "" ], [ "Samaddar", "S. K.", "" ], [ "Sarkar", "Sourav", "" ] ]
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801.0499
Daniel Yekutieli Dr.
Daniel Yekutieli
Adjusted Bayesian inference for selected parameters
null
null
null
null
stat.CO stat.ME
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We address the problem of providing inference from a Bayesian perspective for parameters selected after viewing the data. We present a Bayesian framework for providing inference for selected parameters, based on the observation that providing Bayesian inference for selected parameters is a truncated data problem. We show that if the prior for the parameter is non-informative, or if the parameter is a "fixed" unknown constant, then it is necessary to adjust the Bayesian inference for selection. Our second contribution is the introduction of Bayesian False Discovery Rate controlling methodology,which generalizes existing Bayesian FDR methods that are only defined in the two-group mixture model.We illustrate our results by applying them to simulated data and data froma microarray experiment.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 10:29:09 GMT" }, { "version": "v2", "created": "Mon, 19 Jan 2009 14:12:17 GMT" }, { "version": "v3", "created": "Mon, 26 Jan 2009 08:57:26 GMT" }, { "version": "v4", "created": "Mon, 3 Aug 2009 11:04:47 GMT" }, { "version": "v5", "created": "Sun, 20 Jun 2010 13:21:43 GMT" }, { "version": "v6", "created": "Sun, 27 Mar 2011 17:51:16 GMT" }, { "version": "v7", "created": "Thu, 15 Sep 2011 03:51:07 GMT" } ]
2015-03-13T00:00:00
[ [ "Yekutieli", "Daniel", "" ] ]
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801.05
Pedro Nicolas
Pedro Nicolas, Manuel Saorin
Parametrizing recollement data
35 pages
null
null
Journal of Algebra 322 (2009) 1220-1250
math.RT
null
We give a general parametrization of all the recollement data for a triangulated category with a set of generators. From this we deduce a characterization of when a perfectly generated (or aisled) triangulated category is a recollement of triangulated categories generated by a single compact object. Also, we use homological epimorphisms of dg categories to give a complete and explicit description of all the recollement data for (or smashing subcategories of) the derived category of a k-flat dg category. In the final part we give a bijection between smashing subcategories of compactly generated triangulated categories and certain ideals of the subcategory of compact objects, in the spirit of Henning Krause's work. This bijection implies the following weak version of the Generalized Smashing Conjecture: in a compactly generated triangulated category every smashing subcategory is generated by a set of Milnor colimits of compact objects.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 10:34:41 GMT" } ]
2010-10-05T00:00:00
[ [ "Nicolas", "Pedro", "" ], [ "Saorin", "Manuel", "" ] ]
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801.0501
Ping Ren
Ping Ren
Friedberg-Lee Symmetry for Quark Masses and Flavor Mixing
16 pages, 3 figures
null
null
null
hep-ph
null
We point out a generic correlation between the Friedberg-Lee symmetry of quark mass operators and the vanishing of quark masses. We make phenomenological explorations on two textures of quark mass matrices with the broken Friedberg-Lee symmetry. We present a new pattern of quark mass matrices in agreement with current experimental data. Both analytical and numerical results of our calculations are discussed in detail.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 10:47:37 GMT" } ]
2008-01-04T00:00:00
[ [ "Ren", "Ping", "" ] ]
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801.0502
Tomasz Stachowiak
Jakub Mielczarek, Tomasz Stachowiak, Marek Szydlowski
Exact solutions for Big Bounce in loop quantum cosmology
12 pages, 12 figures, added references and changed introduction and summary
Phys.Rev.D77:123506,2008
10.1103/PhysRevD.77.123506
null
gr-qc
null
In this paper we study the flat (k=0) cosmological FRW model with holonomy corrections of Loop Quantum Gravity. The considered universe contains a massless scalar field and the cosmological constant Lambda. We find analytical solutions for this model in different configurations and investigate its dynamical behaviour in the whole phase space. We show the explicit influence of Lambda on the qualitative and quantitative character of solutions. Even in the case of positive Lambda the oscillating solutions without the initial and final singularity appear as a generic case for some quantisation schemes.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 21:13:30 GMT" }, { "version": "v2", "created": "Sat, 23 Feb 2008 22:08:31 GMT" } ]
2008-11-26T00:00:00
[ [ "Mielczarek", "Jakub", "" ], [ "Stachowiak", "Tomasz", "" ], [ "Szydlowski", "Marek", "" ] ]
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801.0503
Guendelman Eduardo I
E.I. Guendelman
Localized Axion Photon States in a Strong Magnetic Field
9 pages, Latex, pacs:11.30.Fs, 14.80.Mz, 14.70.Bh. A small change in text introduced
Phys.Lett.B662:227-230,2008
10.1016/j.physletb.2008.03.003
null
hep-th
null
We consider the axion field and electromagnetic waves with rapid time dependence, coupled to a strong time independent, asymptotically approaching a constant at infinity "mean" magnetic field, which takes into account the back reaction from the axion field and electromagnetic waves with rapid time dependence in a time averaged way. The direction of the self consistent mean field is orthogonal to the common direction of propagation of the axion and electromagnetic waves with rapid time dependence and parallel to the polarization of these electromagnetic waves. Then, there is an effective U(1) symmetry mixing axions and photons. Using the natural complex variables that this U(1) symmetry suggests we find localized planar soliton solutions. These solutions appear to be stable since they produce a different magnetic flux than the state with only a constant magnetic field, which we take as our "ground state". The solitons also have non trivial U(1) charge defined before, different from the uncharged vacuum.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 10:43:05 GMT" }, { "version": "v2", "created": "Fri, 4 Jan 2008 07:43:28 GMT" } ]
2008-11-26T00:00:00
[ [ "Guendelman", "E. I.", "" ] ]
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801.0504
David Kruml
David Kruml
Quantum triads: an algebraic approach
null
null
null
null
math.CT math.OA math.RA
null
A concept of quantum triad and its solution is introduced. It represents a common framework for several situations where we have a quantale with a right module and a left module, provided with a bilinear inner product. Examples include Van den Bossche quantaloids, quantum frames, simple and Galois quantales, operator algebras, or orthomodular lattices.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 10:57:05 GMT" } ]
2008-01-04T00:00:00
[ [ "Kruml", "David", "" ] ]
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801.0505
Florian Bertrand
Florian Bertrand (LATP)
Sharp estimates of the Kobayashi metric and Gromov hyperbolicity
26 pages, 3 figures
null
10.1016/j.jmaa.2008.04.057
null
math.CV
null
Let D be a smooth relatively compact and strictly J-pseudoconvex domain in a four dimensional almost complex manifold (M,J). We give sharp estimates of the Kobayashi metric. Our approach is based on an asymptotic quantitative description of both the domain D and the almost complex structure J near a boundary point. Following Z.M.Balogh and M.Bonk, these sharp estimates provide the Gromov hyperbolicity of the domain D.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 11:03:24 GMT" } ]
2015-05-13T00:00:00
[ [ "Bertrand", "Florian", "", "LATP" ] ]
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801.0506
Jean-Baptiste Le Bouquin
Jean-Baptiste Le Bouquin (ESO), Bertrand Bauvir (ESO), Pierre Haguenauer (ESO), Markus Scholler (ESO), Fredrik Rantakyro (ESO), Serge Menardi (ESO)
First result with AMBER+FINITO on the VLTI: The high-precision angular diameter of V3879 Sgr
null
null
10.1051/0004-6361:20078550
null
astro-ph
null
Our goal is to demonstrate the potential of the interferometric AMBER instrument linked with the Very Large Telescope Interferometer (VLTI) fringe-tracking facility FINITO to derive high-precision stellar diameters. We use commissioning data obtained on the bright single star V3879 Sgr. Locking the interferometric fringes with FINITO allows us to record very low contrast fringes on the AMBER camera. By fitting the amplitude of these fringes, we measure the diameter of the target in three directions simultaneously with an accuracy of 25 micro-arcseconds. We showed that V3879 Sgr has a round photosphere down to a sub-percent level. We quickly reached this level of accuracy because the technique used is independent from absolute calibration (at least for baselines that fully span the visibility null). We briefly discuss the potential biases found at this level of precision. The proposed AMBER+FINITO instrumental setup opens several perspectives for the VLTI in the field of stellar astrophysics, like measuring with high accuracy the oblateness of fast rotating stars or detecting atmospheric starspots.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 11:14:59 GMT" } ]
2009-11-13T00:00:00
[ [ "Bouquin", "Jean-Baptiste Le", "", "ESO" ], [ "Bauvir", "Bertrand", "", "ESO" ], [ "Haguenauer", "Pierre", "", "ESO" ], [ "Scholler", "Markus", "", "ESO" ], [ "Rantakyro", "Fredrik", "", "ESO" ], [ "Menardi", "Serge", "", "ESO" ] ]
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801.0507
Pedro Nicolas
Pedro Nicolas
On torsion torsionfree triples
Ph. D. thesis, 184 pages
null
null
null
math.RT
null
We study torsion torsionfree(=TTF) triples in abelian and triangulated categories. (Notice that TTF triples in a triangulated category are essentially in bijection with recollement data for this triangulated category.) In particular, we complete Jans' characterization of split TTF triples on a category of modules, prove a weak version of the Generalized Smashing Conjecture, use homological epimorphisms of differential graded(=dg) categories to give an explicite description of all the TTF triples in the derived category of a k-flat dg category and develope an unbounded approach to Koenig's theorem on recollements of right bounded derived categories of ordinary algebras.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 11:15:09 GMT" } ]
2008-01-04T00:00:00
[ [ "Nicolas", "Pedro", "" ] ]
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801.0508
Laurent Allies
Laurent Alli\`es (LIEN), D. Kourtiche (LIEN), M. Nadi (LIEN)
Functions of diffraction correction and analytical solutions in nonlinear acoustic measurement
null
Acta Acustica 881:27-33,2002
null
null
physics.class-ph physics.ins-det
null
This paper presents an analytical formulation for correcting the diffraction associated to the second harmonic of an acoustic wave, more compact than that usually used. This new formulation, resulting from an approximation of the correction applied to fundamental, makes it possible to obtain simple solutions for the second harmonic of the average acoustic pressure, but sufficiently precise for measuring the parameter of nonlinearity B/A in a finite amplitude method. Comparison with other expressions requiring numerical integration, show the solutions are precise in the nearfield.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 11:17:27 GMT" } ]
2009-04-08T00:00:00
[ [ "Alliès", "Laurent", "", "LIEN" ], [ "Kourtiche", "D.", "", "LIEN" ], [ "Nadi", "M.", "", "LIEN" ] ]
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801.0509
Andrea Maffei
Corrado De Concini, Senthamarai Kannan, Andrea Maffei
The quotient of a complete symmetric variety
Dedicated to Ernest Vinberg on occasion of his 70th birthday
null
null
null
math.AG
null
We study the quotient of a completion of a symmetric variety G/H under the action of H. We prove that this is isomorphic to the closure of the image of an isotropic torus under the action of the restricted Weyl group. In the case the completion is smooth and toroidal we describe the set of semistable points.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 11:48:56 GMT" }, { "version": "v2", "created": "Sat, 17 May 2008 07:54:54 GMT" } ]
2008-05-19T00:00:00
[ [ "De Concini", "Corrado", "" ], [ "Kannan", "Senthamarai", "" ], [ "Maffei", "Andrea", "" ] ]
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801.051
Kristof Petrovay
G. Marschalko, K. Petrovay, E. Forgacs-Dajka
Molecular cloud abundances and anomalous diffusion
4 pages, 8 figures
Astron.Nachr.328:871-874,2007
10.1002/asna.200710809
null
astro-ph
null
The chemistry of molecular clouds has been studied for decades, with an increasingly general and sophisticated treatment of the reactions involved. Yet the treatment of turbulent diffusion has remained extremely sketchy, assuming simple Fickian diffusion with a scalar diffusivity D. However, turbulent flows similar to those in the interstellar medium are known to give rise to anomalous diffusion phenomena, more specifically superdiffusion (increase of the diffusivity with the spatial scales involved). This paper considers to what extent and in what sense superdiffusion modifies molecular abundances in interstellar clouds. For this first exploration of the subject we employ a very rough treatment of the chemistry and the effect of non-unifom cloud density on the diffusion equation is also treated in a simplified way. The results nevertheless clearly demonstrate that the effect of superdiffusion is quite significant, abundance values at a given radius being modified by order of unity factors. The sense and character of this influence is highly nontrivial.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 12:10:42 GMT" } ]
2009-06-23T00:00:00
[ [ "Marschalko", "G.", "" ], [ "Petrovay", "K.", "" ], [ "Forgacs-Dajka", "E.", "" ] ]
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801.0511
Ramachandran Shankar
A. M. M. Pruisken, R. Shankar and N. Surendran
Exact Haldane mapping for all $S$ and super universality in spin chains
null
Europhys. Lett. 82, 47005 (2008)
10.1209/0295-5075/82/47005
null
cond-mat.mes-hall cond-mat.str-el
null
The low energy dynamics of the anti-ferromagnetic Heisenberg spin $S$ chain in the semiclassical limit $S\to\infty$ is known to map onto the O(3) nonlinear $\sigma$ model with a $\theta$ term in 1+1 dimension. Guided by the underlying dual symmetry of the spin chain, as well as the recently established topological significance of "dangling edge spins," we report an {\em exact} mapping onto the O(3) model that avoids the conventional large $S$ approximation altogether. Our new methodology demonstrates all the super universal features of the $\theta$ angle concept that previously arose in the theory of the quantum Hall effect. It explains why Haldane's original ideas remarkably yield the correct answer in spite of the fundamental complications that generally exist in the idea of semiclassical expansions.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 12:15:52 GMT" } ]
2009-11-13T00:00:00
[ [ "Pruisken", "A. M. M.", "" ], [ "Shankar", "R.", "" ], [ "Surendran", "N.", "" ] ]
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801.0512
Adam Doliwa
Adam Doliwa
Geometric algebra and quadrilateral lattices
12 pages, 5 figures
null
null
null
nlin.SI
null
Motivated by the fundamental results of the geometric algebra we study quadrilateral lattices in projective spaces over division rings. After giving the noncommutative discrete Darboux equations we discuss differences and similarities with the commutative case. Then we consider the fundamental transformation of such lattices in the vectorial setting and we show the corresponding permutability theorems. We discuss also the possibility of obtaining in a similar spirit a noncommutative version of the B-(Moutard) quadrilateral lattices.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 12:26:25 GMT" } ]
2008-01-04T00:00:00
[ [ "Doliwa", "Adam", "" ] ]
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801.0513
Sergio L. A. de Queiroz
P. R. Wells Jr., J. d'Albuquerque e Castro, S. L. A. de Queiroz
Quantum Diffusion and Localization in Disordered Electronic Systems
RevTex4, 6 pages, 6 .eps figures: published version
Phys. Rev. B 78, 035102 (2008)
10.1103/PhysRevB.78.035102
null
cond-mat.dis-nn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The diffusion of electronic wave packets in one-dimensional systems with on-site, binary disorder is numerically investigated within the framework of a single-band tight-binding model. Fractal properties are incorporated by assuming that the distribution of distances $\ell$ between consecutive impurities obeys a power law, $P(\ell) \sim \ell^{-\alpha}$. For suitable ranges of $\alpha$, one finds system-wide anomalous diffusion. Asymmetric diffusion effects are introduced through the application of an external electric field, leading to results similar to those observed in the case of photogenerated electron-hole plasmas in tilted InP/InGaAs/InP quantum wells.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 12:26:54 GMT" }, { "version": "v2", "created": "Mon, 7 Jul 2008 12:36:24 GMT" } ]
2008-07-07T00:00:00
[ [ "Wells", "P. R.", "Jr." ], [ "Castro", "J. d'Albuquerque e", "" ], [ "de Queiroz", "S. L. A.", "" ] ]
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801.0514
Partha Mukhopadhyay
V. Arvind, Partha Mukhopadhyay, and Srikanth Srinivasan
New results on Noncommutative and Commutative Polynomial Identity Testing
23 pages, no figure
null
null
null
cs.CC
null
Using ideas from automata theory we design a new efficient (deterministic) identity test for the \emph{noncommutative} polynomial identity testing problem (first introduced and studied in \cite{RS05,BW05}). We also apply this idea to the reconstruction of black-box noncommuting algebraic branching programs. Assuming the black-box model allows us to query the ABP for the output at any given gate, we can reconstruct an (equivalent) ABP in deterministic polynomial time. Finally, we explore commutative identity testing when the coefficients of the input polynomial come from an arbitrary finite commutative ring with unity.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 12:32:41 GMT" } ]
2008-01-04T00:00:00
[ [ "Arvind", "V.", "" ], [ "Mukhopadhyay", "Partha", "" ], [ "Srinivasan", "Srikanth", "" ] ]
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801.0515
Martin Weides
Uthayasankaran Peralagu and Martin Weides
Fabrication and Characterization of Short Josephson Junctions with Stepped Ferromagnetic Barrier
modified version, small changes
IEEE/CSC & ESAS News forum, No. 3, ST27, January 2008
null
null
cond-mat.supr-con
null
We present novel low-T_c superconductor-insulator-ferromagnet-superconductor (SIFS) Josephson junctions with planar and stepped ferromagnetic interlayer. We optimized the fabrication process to set a step in the ferromagnetic layer thickness. Depending on the thickness of the ferromagnetic layer the ground state of the SIFS junction has a phase drop of either 0 or pi. So-called 0-pi Josephson junctions, in which 0 and pi ground states compete with each other, were obtained. These stepped junctions may have a double degenerate ground state, corresponding to a vortex of supercurrent circulating clock- or counterclockwise and creating a magnetic flux which carries a fraction of the magnetic flux quantum \Phi_0. Here, we limit the presentation to static properties of short junctions.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 12:39:50 GMT" }, { "version": "v2", "created": "Fri, 18 Jan 2008 16:34:12 GMT" } ]
2008-01-22T00:00:00
[ [ "Peralagu", "Uthayasankaran", "" ], [ "Weides", "Martin", "" ] ]
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801.0516
Metin Gurses
Metin Gurses
Godel Type Metrics in Einstein-Aether Theory
null
null
null
null
gr-qc hep-th math.DG
null
Aether theory is introduced to implement the violation of the Lorentz invariance in general relativity. For this purpose a unit timelike vector field introduced to theory in addition to the metric tensor. Aether theory contains four free parameters which satisfy some inequalities in order that the theory to be consistent with the observations. We show that the G{\" o}del type of metrics of general relativity are also exact solutions of the Einstein-aether theory. The only field equations are the 3-dimensional Maxwell field equations and the parameters are left free except $c_{1}-c_{3}=1$.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 12:34:14 GMT" }, { "version": "v2", "created": "Tue, 26 Feb 2008 09:04:37 GMT" } ]
2008-02-26T00:00:00
[ [ "Gurses", "Metin", "" ] ]
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801.0517
Miloslav Znojil
Miloslav Znojil
PT-symmetric knotting of coordinates: a new, topological mechanism of quantum confinement
16 pp incl 3 figures
null
null
null
quant-ph
null
We construct an exactly solvable PT-symmetric example of Sturmian bound states which exist in the absence of any confining potential. Their origin is purely topological -- these states live on certain nontrivial contours of complex coordinates.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 12:45:50 GMT" } ]
2008-01-04T00:00:00
[ [ "Znojil", "Miloslav", "" ] ]
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801.0518
Pablo Lopez-Rios
P. Lopez-Rios, A. Ma, N. D. Drummond, M. D. Towler, and R. J. Needs
Inhomogeneous backflow transformations in quantum Monte Carlo calculations
~20 pages, 11 figures
Phys. Rev. E 74, 066701 (2006)
10.1103/PhysRevE.74.066701
null
physics.comp-ph
null
An inhomogeneous backflow transformation for many-particle wave functions is presented and applied to electrons in atoms, molecules, and solids. We report variational and diffusion quantum Monte Carlo VMC and DMC energies for various systems and study the computational cost of using backflow wave functions. We find that inhomogeneous backflow transformations can provide a substantial increase in the amount of correlation energy retrieved within VMC and DMC calculations. The backflow transformations significantly improve the wave functions and their nodal surfaces.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 12:55:30 GMT" } ]
2008-01-04T00:00:00
[ [ "Lopez-Rios", "P.", "" ], [ "Ma", "A.", "" ], [ "Drummond", "N. D.", "" ], [ "Towler", "M. D.", "" ], [ "Needs", "R. J.", "" ] ]
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801.0519
Maxim Nazarov
Sergey Khoroshkin, Maxim Nazarov
Twisted Yangians and Mickelsson Algebras II
final version
St. Petersburg Math. J. 21 (2010), 111-161
null
null
math.RT math.QA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We introduce a skew analogue of the composition of the Cherednik and Drinfeld functors for twisted Yangians. Our definition is based on the skew Howe duality, and originates from the centralizer construction of twisted Yangians due to Olshanski. Using our functor, we establish a correspondence between intertwining operators on the tensor products of certain modules over twisted Yangians, and the extremal cocycle on the hyperoctahedral group.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 12:59:09 GMT" }, { "version": "v2", "created": "Wed, 18 Mar 2009 17:32:04 GMT" }, { "version": "v3", "created": "Sun, 6 Dec 2009 12:51:05 GMT" } ]
2009-12-06T00:00:00
[ [ "Khoroshkin", "Sergey", "" ], [ "Nazarov", "Maxim", "" ] ]
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801.052
Xue Guang Zhang
Xue-Guang Zhang, Deborah Dultzin, Ting-Gui Wang
The Correlation Between Spectral Index And Accretion Rate For AGN
10 pages, 7 figures, accepted for publication in MNRAS
null
10.1111/j.1365-2966.2008.12912.x
null
astro-ph
null
In this paper, we present a correlation between the spectral index distribution (SED) and the dimensionless accretion rate defined as $\dot{m}={L_{bol}/L_{Edd}}$ for AGN. This quantity is used as a substitute of the physical accretion rate. We select 193 AGN with both broad H$\alpha$ and broad H$\beta$, and with absorption lines near MgI$\lambda5175\AA$ from SDSS DR4. We determine the spectral index and dimensionless accretion rate after correcting for both host galaxy contribution and internal reddening effects. A correlation is found between the optical spectral index and the dimensionless accretion rate for AGN, including low luminosity AGN ($L_{H\alpha}<10^{41}{\rm erg\cdot s^{-1}}$ sometimes called "dwarf AGN" (Ho et al. 1997)). The existence of this correlation provides an independent method to estimate the central BH masses for all types of AGN. We also find that there is a different correlation between the spectral index and the BH masses for normal AGN and low luminosity AGN, which is perhaps due to the different accretion modes in these two types of nuclei. This in turn may lead to the different correlations between BH masses and optical continuum luminosity reported previously (Zhang et al. 2007a), which invalidates the application of the empirical relationship found by Kaspi et al. (2000, 2005) to low luminosity AGN in order to determine their BLR sizes.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 13:02:17 GMT" } ]
2009-11-13T00:00:00
[ [ "Zhang", "Xue-Guang", "" ], [ "Dultzin", "Deborah", "" ], [ "Wang", "Ting-Gui", "" ] ]
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801.0521
Ming-Yong Ye
Ming-Yong Ye, Xiang-Fa Zhou, Yong-Sheng Zhang, and Guang-Can Guo
Two kinds of quantum adiabatic approximation
10 pages
Physics Letters A Volume 368, Issues 1-2, 13 August 2007, Pages 18-24
null
null
quant-ph
null
A simple proof of quantum adiabatic theorem is provided. Quantum adiabatic approximation is divided into two kinds. For Hamiltonian H(t/T), a relation between the size of the error caused by quantum adiabatic approximation and the parameter T is given.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 13:23:21 GMT" } ]
2008-01-04T00:00:00
[ [ "Ye", "Ming-Yong", "" ], [ "Zhou", "Xiang-Fa", "" ], [ "Zhang", "Yong-Sheng", "" ], [ "Guo", "Guang-Can", "" ] ]
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801.0522
Alexander Rashkovskii
Alexander Rashkovskii
A remark on amoebas in higher codimensions
null
Analysis and Mathematical Physics. Trends in Mathematics, 465-471. Birkhauser, 2009.
null
null
math.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
It is shown that tube sets over amoebas of algebraic varieties (and, more generally, of almost periodic holomorphic chains) of dimension q are q-pseudoconcave in the sense of Rothstein. This is a direct consequence of a representation of such sets as supports of positive closed currents.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 13:28:11 GMT" }, { "version": "v2", "created": "Wed, 17 Sep 2008 14:59:00 GMT" } ]
2010-01-14T00:00:00
[ [ "Rashkovskii", "Alexander", "" ] ]
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801.0523
Florent De Dinechin
Florent De Dinechin (LIP), Christoph Quirin Lauter (LIP), Guillaume Melquiond (LIP)
Certifying floating-point implementations using Gappa
null
null
null
null
cs.NA cs.MS
null
High confidence in floating-point programs requires proving numerical properties of final and intermediate values. One may need to guarantee that a value stays within some range, or that the error relative to some ideal value is well bounded. Such work may require several lines of proof for each line of code, and will usually be broken by the smallest change to the code (e.g. for maintenance or optimization purpose). Certifying these programs by hand is therefore very tedious and error-prone. This article discusses the use of the Gappa proof assistant in this context. Gappa has two main advantages over previous approaches: Its input format is very close to the actual C code to validate, and it automates error evaluation and propagation using interval arithmetic. Besides, it can be used to incrementally prove complex mathematical properties pertaining to the C code. Yet it does not require any specific knowledge about automatic theorem proving, and thus is accessible to a wide community. Moreover, Gappa may generate a formal proof of the results that can be checked independently by a lower-level proof assistant like Coq, hence providing an even higher confidence in the certification of the numerical code. The article demonstrates the use of this tool on a real-size example, an elementary function with correctly rounded output.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 13:34:03 GMT" } ]
2008-01-04T00:00:00
[ [ "De Dinechin", "Florent", "", "LIP" ], [ "Lauter", "Christoph Quirin", "", "LIP" ], [ "Melquiond", "Guillaume", "", "LIP" ] ]
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801.0524
Anthony van Raan
Anthony F.J. van Raan
Self-citation as an impact-reinforcing mechanism in the science system
22 pages, 18 figures, 4 tables
null
null
null
physics.soc-ph physics.data-an
null
In previous papers it was demonstrated that lower performance groups have a larger size-dependent cumulative advantage for receiving citations than top-performance groups. Furthermore, regardless of performance, larger groups have less not-cited publications. Particularly for the lower performance groups the fraction of not-cited publications decreases considerably with size. These phenomena can be explained with a model in which self-citation acts as a promotion mechanism for external citations. In this article we show that for self-citations similar size-dependent scaling rules apply as for citations but generally the power law exponents are higher for self-citations as compared to citations. We also find that the fraction of self-citations is smaller for the higher performance groups and this fraction decreases more rapidly with increasing journal impact than for lower performance groups. An interesting novel finding is that the variance in the correlation of the number of self-citations with size is considerably less than the variance for external citations. This is a clear indication that size is a stronger determinant for self-citations than for external citations. Both higher and particularly lower performance groups have a size-dependent cumulative advantage for self-citations, but for the higher performance groups only in the lower impact journals and in fields with low citation density.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 13:41:05 GMT" } ]
2008-01-04T00:00:00
[ [ "van Raan", "Anthony F. J.", "" ] ]
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801.0525
Marian Ioan Munteanu Dr
Marian Ioan Munteanu and Ana Irina Nistor
A New Approach on Constant Angle Surfaces in E^3
9 pages, 4 figures
Turkish J. Mathematics, 33, (2009), 168-178.
null
null
math.DG
null
In this paper we study constant angle surfaces in Euclidean 3-space. Even that the result is a consequence of some classical results involving the Gauss map (of the surface), we give another approach to classify all surfaces for which the unit normal makes a constant angle with a fixed direction.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 13:53:04 GMT" } ]
2009-07-01T00:00:00
[ [ "Munteanu", "Marian Ioan", "" ], [ "Nistor", "Ana Irina", "" ] ]
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801.0526
Samuel Boissiere
Samuel Boissiere and Alessandra Sarti
On the Neron-Severi group of surfaces with many lines
To appear in Proc. AMS
null
null
null
math.AG
null
For a binary quartic form $\phi$ without multiple factors, we classify the quartic K3 surfaces $\phi(x,y)=\phi(z,t)$ whose Neron-Severi group is (rationally) generated by lines. For generic binary forms $\phi$, $\psi$ of prime degree without multiple factors, we prove that the Neron-Severi group of the surface $\phi(x,y)=\psi(z,t)$ is rationally generated by lines.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 14:09:37 GMT" } ]
2008-01-04T00:00:00
[ [ "Boissiere", "Samuel", "" ], [ "Sarti", "Alessandra", "" ] ]
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801.0527
Elizabeth Winstanley
Elizabeth Winstanley
Classical Yang-Mills black hole hair in anti-de Sitter space
41 pages, 14 figures. Based on the lecture given at the 4th Aegean Summer School
Lect.Notes Phys.769:49-87,2009
10.1007/978-3-540-88460-6_2
null
gr-qc hep-th
null
The properties of hairy black holes in Einstein-Yang-Mills (EYM) theory are reviewed, focusing on spherically symmetric solutions. In particular, in asymptotically anti-de Sitter space (adS) stable black hole hair is known to exist for su(2) EYM. We review recent work in which it is shown that stable hair also exists in su(N) EYM for arbitrary N, so that there is no upper limit on how much stable hair a black hole in adS can possess.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 16:53:26 GMT" } ]
2009-01-28T00:00:00
[ [ "Winstanley", "Elizabeth", "" ] ]
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801.0528
Dmitri Khokhlov
D.L. Khokhlov
A scheme of supraluminal telegraph
This paper has been withdrawn by the author due to the presented idea is wrong
null
null
null
physics.gen-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper has been withdrawn by the author due to the presented idea is wrong.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 14:28:59 GMT" }, { "version": "v2", "created": "Tue, 29 Jan 2008 15:06:01 GMT" }, { "version": "v3", "created": "Wed, 12 Nov 2008 14:25:01 GMT" } ]
2008-11-12T00:00:00
[ [ "Khokhlov", "D. L.", "" ] ]
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801.0529
Sandy Donnachie
A Donnachie and Yu S Kalashnikova
Scalar Meson Photoproduction
Talk given at HADRON07, Frascati
null
null
null
hep-ph
null
The scalar mesons f0(1370), f0(1500) and f0(1710) are of interest as there is as yet no consensus of their status, or indeed of the existence of the f0(1370). Radiative decays to rho and omega have been shown to provide effective probes of their structure and to discriminate among models. Scalar-meson photoproduction is proposed as an alternative and it is shown that it represents a feasible approach.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 14:30:09 GMT" } ]
2008-01-04T00:00:00
[ [ "Donnachie", "A", "" ], [ "Kalashnikova", "Yu S", "" ] ]
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801.053
Jean-Fran\c{c}ois Burnol
Jean-Francois Burnol
On some bound and scattering states associated with the cosine kernel
18 pages
null
null
null
math.NT math-ph math.MP
null
It is explained how to provide self-adjoint operators having scattering states forming a multiplicity one continuum and bound states whose corresponding eigenvalues have an asymptotic density equivalent to the one of the zeros of the Riemann zeta function. It is shown how this can be put into an integro-differential form of a type recently considered by Sierra.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 14:34:46 GMT" }, { "version": "v2", "created": "Fri, 4 Jan 2008 08:56:34 GMT" } ]
2008-01-04T00:00:00
[ [ "Burnol", "Jean-Francois", "" ] ]
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801.0531
Jeppe C. Dyre
Thomas B. Schr{\o}der and Jeppe C. Dyre
Ac hopping conduction at extreme disorder takes place on the percolating cluster
null
Phys. Rev. Lett. 101, 025901 (2008)
10.1103/PhysRevLett.101.025901
null
cond-mat.dis-nn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Simulations of the random barrier model show that ac currents at extreme disorder are carried almost entirely by the percolating cluster slightly above threshold; thus contradicting traditional theories contributions from isolated low-activation-energy clusters are negligible. The effective medium approximation in conjunction with the Alexander-Orbach conjecture leads to an excellent analytical fit to the universal ac conductivity with no nontrivial fitting parameters.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 14:43:18 GMT" }, { "version": "v2", "created": "Thu, 22 May 2008 20:58:47 GMT" }, { "version": "v3", "created": "Thu, 5 Jun 2008 13:24:11 GMT" }, { "version": "v4", "created": "Fri, 6 Jun 2008 21:08:54 GMT" } ]
2016-08-14T00:00:00
[ [ "Schrøder", "Thomas B.", "" ], [ "Dyre", "Jeppe C.", "" ] ]
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801.0532
Ralph M. Kaufmann
Ralph M. Kaufmann
Dimension vs. Genus: A surface realization of the little k-cubes and an E_{\infty}-operad
36 pages, 15 figures, new version, some more explanations and clarifications added
null
null
null
math.AT math.QA
null
We define a new $E_{\infty}$ operad based on surfaces with foliations which contains $E_k$ sub-operads. We construct CW models for these operads and provide applications of these models by giving actions on Hochschild complexes -thus making contact with string topology-, by giving explicit cell representatives for the Dyer-Lashof-Cohen operations for the 2-cubes and by constructing new $\Omega$ spectra. The underlying novel principle is that we can trade genus in the surface representation vs. the dimension $k$ of the little $k$-cubes.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 14:52:43 GMT" }, { "version": "v2", "created": "Fri, 21 Mar 2008 15:28:59 GMT" } ]
2008-03-21T00:00:00
[ [ "Kaufmann", "Ralph M.", "" ] ]
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801.0533
Olivier Finkel
Olivier Finkel (ELM), Pierre Simonnet (SPE)
Topology and Ambiguity in Omega Context Free Languages
null
Bulletin of the Belgian Mathematical Society 10 (5) (2003) 707-722
null
null
cs.LO math.LO
null
We study the links between the topological complexity of an omega context free language and its degree of ambiguity. In particular, using known facts from classical descriptive set theory, we prove that non Borel omega context free languages which are recognized by B\"uchi pushdown automata have a maximum degree of ambiguity. This result implies that degrees of ambiguity are really not preserved by the operation of taking the omega power of a finitary context free language. We prove also that taking the adherence or the delta-limit of a finitary language preserves neither unambiguity nor inherent ambiguity. On the other side we show that methods used in the study of omega context free languages can also be applied to study the notion of ambiguity in infinitary rational relations accepted by B\"uchi 2-tape automata and we get first results in that direction.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 14:47:36 GMT" } ]
2008-01-04T00:00:00
[ [ "Finkel", "Olivier", "", "ELM" ], [ "Simonnet", "Pierre", "", "SPE" ] ]
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801.0534
Olivier Finkel
Olivier Finkel (ELM)
On the Length of the Wadge Hierarchy of Omega Context Free Languages
null
Journal of Automata, Languages and Combinatorics 10 (4) (2005) 439-464
null
null
cs.LO cs.CC cs.GT math.LO
null
We prove in this paper that the length of the Wadge hierarchy of omega context free languages is greater than the Cantor ordinal epsilon_omega, which is the omega-th fixed point of the ordinal exponentiation of base omega. The same result holds for the conciliating Wadge hierarchy, defined by J. Duparc, of infinitary context free languages, studied by D. Beauquier. We show also that there exist some omega context free languages which are Sigma^0_omega-complete Borel sets, improving previous results on omega context free languages and the Borel hierarchy.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 14:48:48 GMT" } ]
2008-01-04T00:00:00
[ [ "Finkel", "Olivier", "", "ELM" ] ]
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801.0535
Olivier Finkel
Olivier Finkel (ELM)
An omega-Power of a Finitary Language Which is a Borel Set of Infinite Rank
null
Fundamenta Informaticae 62 (3-4) (2004) 333-342
null
null
cs.LO math.LO
null
Omega-powers of finitary languages are omega languages in the form V^omega, where V is a finitary language over a finite alphabet X. Since the set of infinite words over X can be equipped with the usual Cantor topology, the question of the topological complexity of omega-powers naturally arises and has been raised by Niwinski, by Simonnet, and by Staiger. It has been recently proved that for each integer n > 0, there exist some omega-powers of context free languages which are Pi^0_n-complete Borel sets, and that there exists a context free language L such that L^omega is analytic but not Borel. But the question was still open whether there exists a finitary language V such that V^omega is a Borel set of infinite rank. We answer this question in this paper, giving an example of a finitary language whose omega-power is Borel of infinite rank.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 14:49:23 GMT" } ]
2008-01-04T00:00:00
[ [ "Finkel", "Olivier", "", "ELM" ] ]
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801.0536
Stanislaw Mrowczynski
Stanislaw Mrowczynski
Chromodynamic Fluctuations in Quark-Gluon Plasma
19 pages, numerous but minor corrections, to appear in Phys. Rev. D
Phys.Rev.D77:105022,2008
10.1103/PhysRevD.77.105022
null
hep-ph nucl-th
null
Fluctuations of chromodynamic fields in the collisionless quark-gluon plasma are found as a solution of the initial value linearized problem. The plasma initial state is on average colorless, stationary and homogeneous. When the state is stable, the initial fluctuations decay exponentially and in the long-time limit a stationary spectrum of fluctuations is established. For the equilibrium plasma it reproduces the spectrum which is provided by the fluctuation-dissipation relation. Fluctuations in the unstable plasma, where the memory of initial fluctuations is not lost, are also discussed.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 16:56:03 GMT" }, { "version": "v2", "created": "Mon, 21 Jan 2008 16:04:41 GMT" }, { "version": "v3", "created": "Fri, 4 Apr 2008 23:03:11 GMT" } ]
2008-11-26T00:00:00
[ [ "Mrowczynski", "Stanislaw", "" ] ]
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801.0537
Olivier Finkel
Olivier Finkel (ELM), Jean-Pierre Ressayre (ELM), Pierre Simonnet (SPE)
On Infinite Real Trace Rational Languages of Maximum Topological Complexity
null
Zapiski Nauchnyh Seminarov POMI 316 (2004) 205-223
null
null
cs.LO math.LO
null
We consider the set of infinite real traces, over a dependence alphabet (Gamma, D) with no isolated letter, equipped with the topology induced by the prefix metric. We then prove that all rational languages of infinite real traces are analytic sets and that there exist some rational languages of infinite real traces which are analytic but non Borel sets, and even Sigma^1_1-complete, hence of maximum possible topological complexity.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 14:51:16 GMT" } ]
2008-01-04T00:00:00
[ [ "Finkel", "Olivier", "", "ELM" ], [ "Ressayre", "Jean-Pierre", "", "ELM" ], [ "Simonnet", "Pierre", "", "SPE" ] ]
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801.0538
Francois Fillastre
Fran\c{c}ois Fillastre (AGM)
Polyhedral hyperbolic metrics on surfaces
null
null
null
null
math.DG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In the last section of \cite{CompHyp} it is proved that the map $\mathcal{I}$ is a finite-sheeted covering map between $\mathcal{P}$ and $\mathcal{M}$. As $\mathcal{M}$ is simply connected it is deduced that $\mathcal{I}$ is a homeomorphism. The fact that $\mathcal{P}$ is connected is missing. Here we provide a proof.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 14:54:42 GMT" }, { "version": "v2", "created": "Mon, 15 Sep 2008 18:39:09 GMT" } ]
2008-09-15T00:00:00
[ [ "Fillastre", "François", "", "AGM" ] ]
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801.0539
Ming-Lun Chen
Ming-Lun Chen
Decoherence of the Kondo Singlet Caused by Phase-sensitive Detection
11 pages, 3 figures, 15 references
null
null
null
cond-mat.str-el cond-mat.other
null
We investigate the dephasing effect of the Kondo singlet in an Aharonov-Bohm interferometer with a quantum dot coupling to left and right electrodes. By employing the cluster expansions, the equations of motion of Green functions are transformed into the corresponding equation of motion of connected Green functions, which contains the correlation of two conduction electrons beyond the Lacroix approximation. With the method we show that the Kondo resonance is suppressed by phase-sensitive detection of Aharonov-Bohm interferometer. Our numerical results have provided a qualitative explanation with the anomalous features observed in a recent experiment by Avinun-Kalish \emph{et al}. [Phys. Rev. Lett. \textbf{92}, 156801 (2004)].
[ { "version": "v1", "created": "Thu, 3 Jan 2008 00:19:43 GMT" }, { "version": "v2", "created": "Tue, 8 Jan 2008 14:32:48 GMT" } ]
2008-01-08T00:00:00
[ [ "Chen", "Ming-Lun", "" ] ]
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801.054
L\'or\'ant Farkas
L\'or\'ant Farkas
Blind decoding of Linear Gaussian channels with ISI, capacity, error exponent, universality
7 pages, 1 figure
null
null
null
cs.IT math.IT
null
A new straightforward universal blind detection algorithm for linear Gaussian channel with ISI is given. A new error exponent is derived, which is better than Gallager's random coding error exponent.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 14:56:17 GMT" } ]
2008-01-04T00:00:00
[ [ "Farkas", "Lóránt", "" ] ]
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801.0541
Mairead Skelly
M. B. Skelly, Y. C. Unruh, A. Collier Cameron, J. R. Barnes, J.-F. Donati, W. A. Lawson, B. D. Carter
Doppler Images and Chromospheric Variability of TWA 6
13 pages, 16 figures
null
10.1111/j.1365-2966.2008.12917.x
null
astro-ph
null
We present Doppler imaging and Balmer line analysis of the weak-line T Tauri star TWA 6. Using this data we have made one of the first attempts to measure differential rotation in a T Tauri star, and the first detection of a slingshot prominence in such a star. We also show the most direct evidence to date of the existence of solar-type plages in a star other than the Sun. Observations were made over six nights: 11-13th February 2006 and 18-20th February 2006, when spectra were taken with the UCL Echelle Spectrograph on the 3.9-m Anglo-Australian Telescope. Using least-squares deconvolution to improve the effective signal--to--noise ratio we produced two Doppler maps. These show similar features to maps of other rapidly rotating T Tauri stars, i.e. a polar spot with more spots extending out of it down to equator. Comparison of the two maps was carried out to measure the differential rotation. Cross-correlation and parameter fitting indicates that TWA 6 does not have detectable differential rotation. The Balmer emission of the star was studied. The mean H-alpha profile has a narrow component consistent with rotational broadening and a broad component extending out to 250km/s. The variability in H-alpha suggests that the chromosphere has active regions that are cospatial with the spots in the photosphere, similar to the 'plages' observed on the Sun. In addition the star has at least one slingshot prominence 3 stellar radii above the surface - the first such detection in a T Tauri star.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 15:16:59 GMT" } ]
2009-11-13T00:00:00
[ [ "Skelly", "M. B.", "" ], [ "Unruh", "Y. C.", "" ], [ "Cameron", "A. Collier", "" ], [ "Barnes", "J. R.", "" ], [ "Donati", "J. -F.", "" ], [ "Lawson", "W. A.", "" ], [ "Carter", "B. D.", "" ] ]
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801.0542
Francois Renard
Jean-Pierre Gratier (LGIT), Laurent Muquet (LGIT), Riad Hassani (LGIT), Francois Renard (LGIT, PGP)
Experimental microstylolites in quartz and modelling of natural stylolitic structures
null
Journal of Structural Geology 27 (2005) 89-100
10.1016/j.jsg.2004.05.007
null
physics.geo-ph
null
Experimental microstylolites have been observed at stressed contacts between quartz grains loaded for several weeks in the presence of an aqueous silica solution, at 350 8C and 50 MPa of differential stress. Stereoscopic analysis of pairs of SEM images yielded a digital elevation model of the surface of the microstylolites. Fourier analyses of these microstylolites reveal a self-affine roughness (with a roughness exponent H of 1.2). Coupled with observations of close interactions between dissolution pits and stylolitic peaks, these data illustrate a possible mechanism for stylolite formation. The complex geometry of stylolite surfaces is imposed by the interplay between the development of dissolution peaks in preferential locations (fast dissolution pits) and the mechanical properties of the solid-fluid-solid interfaces. Simple mechanical modeling expresses the crucial competition that could rule the development of microstylolites: (i) a stress-related process, modeled in terms of the stiffness of springs that activate the heterogeneous dissolution rates of the solid interface, promotes the deflection. In parallel, (ii) the strength of the solid interface, modeled in terms of the stiffness of a membrane, is equivalent to a surface tension that limits the deflection and opposes its development. The modeling produces stylolitic surfaces with characteristic geometries varying from conical to columnar when both the effect of dissolution-rate heterogeneity and the strength properties of the rock are taken into account. A self-affine roughness exponent (Hz1.2) measured on modeled surfaces is comparable with natural stylolites at small length scale and experimental microstylolites.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 14:57:17 GMT" } ]
2009-11-13T00:00:00
[ [ "Gratier", "Jean-Pierre", "", "LGIT" ], [ "Muquet", "Laurent", "", "LGIT" ], [ "Hassani", "Riad", "", "LGIT" ], [ "Renard", "Francois", "", "LGIT, PGP" ] ]
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801.0543
Francois Renard
Francois Renard (LGIT, PGP), Elisabeth Gundersen (PGP), Roland Hellmann (LGIT), Marielle Collombet (LGIT), Yvi Le Guen (LGIT, IFP)
Numerical modeling of carbon dioxide sequestration on the rate of pressure solution creep in limestone: Preliminary results
null
Oil & Gas Science and Technology 60 (2005) 381-399
null
null
physics.geo-ph
null
When carbon dioxide (CO2) is injected into an aquifer or a depleted geological reservoir, its dissolution into solution results in acidification of the pore waters. As a consequence, the pore waters become more reactive, which leads to enhanced dissolution-precipitation processes and a modification of the mechanical and hydrological properties of the rock. This effect is especially important for limestones given that the solubility and reactivity of carbonates is strongly dependent on pH and the partial pressure of CO2. The main mechanism that couples dissolution, precipitation and rock matrix deformation is commonly referred to as intergranular pressure solution creep (IPS) or pervasive pressure solution creep (PSC). This process involves dissolution at intergranular grain contacts subject to elevated stress, diffusion of dissolved material in an intergranular fluid, and precipitation in pore spaces subject to lower stress. This leads to an overall and pervasive reduction in porosity due to both grain indentation and precipitation in pore spaces. The percolation of CO2-rich fluids may influence on-going compaction due to pressure solution and can therefore potentially affect the reservoir and its long-term CO2 storage capacity. We aim at quantifying this effect by using a 2D numerical model to study the coupling between dissolution-precipitation processes, local mass transfer, and deformation of the rock over long time scales. We show that high partial pressures of dissolved CO2 (up to 30 MPa) significantly increase the rates of compaction by a factor of ~ 50 to ~ 75, and also result in a concomitant decrease in the viscosity of the rock matrix.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 14:59:09 GMT" } ]
2008-01-04T00:00:00
[ [ "Renard", "Francois", "", "LGIT, PGP" ], [ "Gundersen", "Elisabeth", "", "PGP" ], [ "Hellmann", "Roland", "", "LGIT" ], [ "Collombet", "Marielle", "", "LGIT" ], [ "Guen", "Yvi Le", "", "LGIT, IFP" ] ]
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801.0544
Francois Renard
Francois Renard (LGIT, PGP), Christophe Voisin (LGIT), Davd Marsan (LGIT), Jean Schmittbuhl (IPGS)
High resolution 3D laser scanner measurements of a strike-slip fault quantify its morphological anisotropy at all scales
null
Geophysical Research Letters 33 (2006) L04305
10.1029/2005GL025038
null
physics.geo-ph
null
The surface roughness of a recently exhumed strikeslip fault plane has been measured by three independent 3D portable laser scanners. Digital elevation models of several fault surface areas, from 1 m2 to 600 m2, have been measured at a resolution ranging from 5 mm to 80 mm. Out of plane height fluctuations are described by non-Gaussian distribution with exponential long range tails. Statistical scaling analyses show that the striated fault surface exhibits self-affine scaling invariance with a small but significant directional morphological anisotropy that can be described by two scaling roughness exponents, H1 = 0.7 in the direction of slip and H2 = 0.8 perpendicular to the direction of slip.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 15:01:40 GMT" } ]
2008-01-04T00:00:00
[ [ "Renard", "Francois", "", "LGIT, PGP" ], [ "Voisin", "Christophe", "", "LGIT" ], [ "Marsan", "Davd", "", "LGIT" ], [ "Schmittbuhl", "Jean", "", "IPGS" ] ]
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801.0545
Francois Renard
Francois Renard (LGIT, PGP), Dominique Bernard (ICMCB), Jacques Desrues (3S), Erwan Plougonven (ICMCB), Audrey Ougier-Simonin (LGIT)
Characterisation of hydraulic fractures in limestones using X-ray microtomography
null
Advances in x-ray tomography for geomaterials, ISTE (Ed.) (2006) 221-227
null
null
physics.geo-ph
null
Hydraulic tension fractures were produced in porous limestones using a specially designed hydraulic cell. The 3D geometry of the samples was imaged using X-ray computed microtomography before and after fracturation. Using these data, it was possible to estimate the permeability tensor of the core samples, extract the path of the rupture and compare it to the heterogeneities initially present in the rock.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 15:09:39 GMT" } ]
2008-01-04T00:00:00
[ [ "Renard", "Francois", "", "LGIT, PGP" ], [ "Bernard", "Dominique", "", "ICMCB" ], [ "Desrues", "Jacques", "", "3S" ], [ "Plougonven", "Erwan", "", "ICMCB" ], [ "Ougier-Simonin", "Audrey", "", "LGIT" ] ]
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801.0546
Francois Renard
Alexandre Brouste (LMC - IMAG), Fran\c{c}ois Renard (LGIT, PGP), Jean-Pierre Gratier (LGIT), Jean Schmittbuhl (IPGS)
Variety of stylolites morphologies and statistical characterization of the amount of heterogeneities in the rock
null
Journal of Structural Geology 29 (2007) 422-434
10.1016/j.jsg.2006.09.014
null
physics.geo-ph
null
The surface roughness of several stylolites in limestones was measured using high resolution laser profilometry. The 1D signals obtained were statistically analyzed to determine the scaling behavior and calculate a roughness exponent, also called Hurst exponent. Statistical methods based on the characterization of a single Hurst exponent imply strong assumptions on the mathematical characteristics of the signal: the derivative of the signal (or local increments) should be stationary and have finite variance. The analysis of the measured stylolites show that these properties are not always verified simultaneously. The stylolite profiles show persistence and jumps and several stylolites are not regular, with alternating regular and irregular portions. A new statistical method is proposed here, based on a non-stationary but Gaussian model, to estimate the roughness of the profiles and quantify the heterogeneity of stylolites. This statistical method is based on two parameters: the local roughness (H) which describes the local amplitude of the stylolite, and the amount of irregularities on the signal (\mu), which can be linked to the heterogeneities initially present in the rock before the stylolite formed. Using this technique, a classification of the stylolites in two families is proposed: those for which the morphology is homogeneous everywhere and those with alternating regular and irregular portions.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 15:15:59 GMT" } ]
2009-11-13T00:00:00
[ [ "Brouste", "Alexandre", "", "LMC - IMAG" ], [ "Renard", "François", "", "LGIT, PGP" ], [ "Gratier", "Jean-Pierre", "", "LGIT" ], [ "Schmittbuhl", "Jean", "", "IPGS" ] ]
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801.0547
Laura La Porta
L. La Porta, C. Burigana, W. Reich, P. Reich
The impact of Galactic synchrotron emission on CMB anisotropy measurements. I. Angular power spectrum analysis of total intensity all-sky surveys
15 pages, 20 figures, Astronomy & Astrophysics, accepted
null
10.1051/0004-6361:20078435
null
astro-ph
null
Galactic foreground emission is a limiting factor for precise cosmic microwave background (CMB) anisotropy measurements. We perform an angular power spectrum analysis (APS) of all-sky total intensity maps at 408 MHz and 1420 MHz, which are dominated by synchrotron emission out of the Galactic plane. We subtract the brighter sources from the maps. We study the APS as a function of Galactic latitude by considering various cuts and as a function of sky position by dividing the sky into patches of about 15 deg x 15 deg in size. The APS of the Galactic radio diffuse synchrotron emission is best fitted by a power law, $C_{\ell} \sim k \ell^{\alpha}$, with $\alpha \in [-3.0,-2.6]$, where the lower values of $\alpha$ typically correspond to the higher latitudes. Nevertheless, the analysis of the patches reveals that strong local variations exist. The mean APS for $\ell \in [20,40]$ is used to determine the mean spectral index between 408 MHz and 1420 MHz, which is then adopted to extrapolate the synchrotron APS results to the microwave range. A simple extrapolation to 23 GHz of the synchrotron emission APS found at 408 and 1420 MHz does not explain all the power in the WMAP synchrotron component even at middle/high Galactic latitudes. This suggests a significant microwave contribution (of about 50% of the signal) by other components such as free-free or spinning dust emission. The comparison between the extrapolated synchrotron APS and the CMB APS shows that a mask excluding the regions with $|b_{gal}| \lesssim 5^{\circ}$ would reduce the foreground fluctuations to about half of the cosmological ones at 70 GHz even at the lowest multipoles. We discuss the main implications of our analysis for the cosmological exploitation of microwave temperature anisotropy maps.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 10:34:51 GMT" } ]
2009-11-13T00:00:00
[ [ "La Porta", "L.", "" ], [ "Burigana", "C.", "" ], [ "Reich", "W.", "" ], [ "Reich", "P.", "" ] ]
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801.0548
Francois Renard
Roland Hellmann (LGIT), Damien Daval (LGE), Delphine Tisserand (LGIT), Fran\c{c}ois Renard (LGIT, PGP)
Albite feldspar dissolution kinetics as a function of the Gibbs free energy at high pCO_2
null
Water-rock Interaction, Taylor and Francis (Ed.) (2007) 591-595
null
null
physics.geo-ph
null
We are currently measuring the dissolution kinetics of albite feldspar at 100 deg C in the presence of high levels of dissolved CO_2 (pCO_2 = 9 MPa) as a function of the saturation state of the feldspar (Gibbs free energy of reaction, \Delta G). The experiments are conducted using a flow through reactor, thereby allowing the dissolution reactions to occur at a fixed pH and at constant, but variable saturation states. Preliminary results indicate that at far-from-equilibrium conditions, the dissolution kinetics of albite are defined by a rate plateau, with R \approx 5.0 x 10^{-10} mol m^{-2} s^{-1} at -70 < \Delta G < -40 kJ mol^{-1}. At \Delta G > -40 kJ mol^{-1}, the rates decrease sharply, revealing a strong inverse relation between the dissolution rate and free energy. Based on the experiments carried out to date, the dissolution rate-free energy data correspond to a highly non-linear and sigmoidal relation, in accord with recent studies.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 15:29:03 GMT" } ]
2008-01-04T00:00:00
[ [ "Hellmann", "Roland", "", "LGIT" ], [ "Daval", "Damien", "", "LGE" ], [ "Tisserand", "Delphine", "", "LGIT" ], [ "Renard", "François", "", "LGIT, PGP" ] ]
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801.0549
Keith Gilmore
Keith Gilmore, Yves U. Idzerda and Mark D. Stiles
Spin orbit precession damping in transition metal ferromagnets
To appear in J. Appl. Phys. (May/June 2008)
null
10.1063/1.2832348
null
cond-mat.mtrl-sci
null
We provide a simple explanation, based on an effective field, for the precession damping rate due to the spin-orbit interaction. Previous effective field treatments of spin-orbit damping include only variations of the state energies with respect to the magnetization direction, an effect referred to as the breathing Fermi surface. Treating the interaction of the rotating spins with the orbits as a perturbation, we include also changes in the state populations in the effective field. In order to investigate the quantitative differences between the damping rates of iron, cobalt, and nickel, we compute the dependence of the damping rate on the density of states and the spin-orbit parameter. There is a strong correlation between the density of states and the damping rate. The intraband terms of the damping rate depend on the spin-orbit parameter cubed while the interband terms are proportional to the spin-orbit parameter squared. However, the spectrum of band gaps is also an important quantity and does not appear to depend in a simple way on material parameters.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 15:30:21 GMT" } ]
2009-11-13T00:00:00
[ [ "Gilmore", "Keith", "" ], [ "Idzerda", "Yves U.", "" ], [ "Stiles", "Mark D.", "" ] ]
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801.055
George Svetlichny
George Svetlichny
Is there a measurement-only version of quantum mechanics?
10 pages. Based on a talk given at the XXVth Workshop on Geometric Methods in Physics (Bialowieza, 2006) and at the Biannual conference of the International Quantum Structures Association (Malta 2006) under the title "Quantum Information and the Problem of Time". V2 added one reference
null
null
null
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Tensor universality often implies that multi-partite quantum-state processing is determined by what happens in totally disentangled cases. In independent systems relative time direction for the parts is arbitrary. This hints that time may be linked to entanglement and measurements and that there may be a measurement-only version of quantum mechanics. One-way quantum computation suggests that this may be possible.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 15:38:55 GMT" }, { "version": "v2", "created": "Tue, 24 Mar 2009 20:16:29 GMT" } ]
2009-03-24T00:00:00
[ [ "Svetlichny", "George", "" ] ]
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801.0551
Noemi Kurt
Noemi Kurt
Maximum and entropic repulsion for a Gaussian membrane model in the critical dimension
Published in at http://dx.doi.org/10.1214/08-AOP417 the Annals of Probability (http://www.imstat.org/aop/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Annals of Probability 2009, Vol. 37, No. 2, 687-725
10.1214/08-AOP417
IMS-AOP-AOP417
math.PR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider the real-valued centered Gaussian field on the four-dimensional integer lattice, whose covariance matrix is given by the Green's function of the discrete Bilaplacian. This is interpreted as a model for a semiflexible membrane. $d=4$ is the critical dimension for this model. We discuss the effect of a hard wall on the membrane, via a multiscale analysis of the maximum of the field. We use analytic and probabilistic tools to describe the correlation structure of the field.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 15:39:13 GMT" }, { "version": "v2", "created": "Thu, 15 May 2008 09:12:19 GMT" }, { "version": "v3", "created": "Thu, 11 Jun 2009 08:19:24 GMT" } ]
2009-06-11T00:00:00
[ [ "Kurt", "Noemi", "" ] ]
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801.0552
Oyvind Gron
Oyvind Gron
A new standard model of the universe
10 pages, 11 figures
Eur.J.Phys.23:135-144,2002
10.1088/0143-0807/23/2/307
null
astro-ph
null
Analytical properties of a flat universe with cold matter and vacuum energy is presented.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 15:39:25 GMT" } ]
2009-11-13T00:00:00
[ [ "Gron", "Oyvind", "" ] ]
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801.0553
Thomas Buchert
Mauro Carfora, Thomas Buchert
Ricci flow deformation of cosmological initial data sets
Invited Talk presented at WASCOM 07, 14th International Conference on Waves and Stability in Continuous Media, Scicli (Ragusa, Italy), June 30-July 6, 2007, eds.: N.Manganaro, R.Monaco, S.Rionero, T.Ruggeri, to be published by World Scientific, 11 pages
null
10.1142/9789812772350_0019
null
math-ph gr-qc math.MP
null
Ricci flow deformation of cosmological initial data sets in general relativity is a technique for generating families of initial data sets which potentially would allow to interpolate between distinct spacetimes. This idea has been around since the appearance of the Ricci flow on the scene, but it has been difficult to turn it into a sound mathematical procedure. In this expository talk we illustrate, how Perelman's recent results in Ricci flow theory can considerably improve on such a situation. From a physical point of view this analysis can be related to the issue of finding a constant-curvature template spacetime for the inhomogeneous Universe, relevant to the interpretation of observational data and, hence, bears relevance to the dark energy and dark matter debates. These techniques provide control on curvature fluctuations (intrinsic backreaction terms) in their relation to the averaged matter distribution.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 15:53:27 GMT" } ]
2017-08-23T00:00:00
[ [ "Carfora", "Mauro", "" ], [ "Buchert", "Thomas", "" ] ]
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801.0554
Antony Lewis
Samira Hamimeche and Antony Lewis
Likelihood Analysis of CMB Temperature and Polarization Power Spectra
35 pages, corrected over-generalization in eq A9 and missing symmetrization factors in Eqs. A13,A14 - no results changed
Phys.Rev.D77:103013,2008
10.1103/PhysRevD.77.103013
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Microwave background temperature and polarization observations are a powerful way to constrain cosmological parameters if the likelihood function can be calculated accurately. The temperature and polarization fields are correlated, partial sky coverage correlates power spectrum estimators at different ell, and the likelihood function for a theory spectrum given a set of observed estimators is non-Gaussian. An accurate analysis must model all these properties. Most existing likelihood approximations are good enough for a temperature-only analysis, however they cannot reliably handle a temperature-polarization correlations. We give a new general approximation applicable for correlated Gaussian fields observed on part of the sky. The approximation models the non-Gaussian form exactly in the ideal full-sky limit and is fast to evaluate using a pre-computed covariance matrix and set of power spectrum estimators. We show with simulations that it is good enough to obtain correct results at ell >~ 30 where an exact calculation becomes impossible. We also show that some Gaussian approximations give reliable parameter constraints even though they do not capture the shape of the likelihood function at each ell accurately. Finally we test the approximations on simulations with realistically anisotropic noise and asymmetric foreground mask.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 17:13:51 GMT" }, { "version": "v2", "created": "Fri, 13 Jun 2008 13:39:57 GMT" }, { "version": "v3", "created": "Sun, 6 Jun 2010 19:45:24 GMT" }, { "version": "v4", "created": "Tue, 24 Apr 2012 16:50:49 GMT" } ]
2012-04-25T00:00:00
[ [ "Hamimeche", "Samira", "" ], [ "Lewis", "Antony", "" ] ]
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801.0555
Gideon Simpson
Gideon Simpson, Michael I. Weinstein, Philip Rosenau
On a Hamiltonian PDE arising in Magma Dynamics
27 pages, submitted to DCDS-B
null
null
null
nlin.PS math.AP
null
In this article we discuss a new Hamiltonian PDE arising from a class of equations appearing in the study of magma, partially molten rock, in the Earth's interior. Under physically justifiable simplifications, a scalar, nonlinear, degenerate, dispersive wave equation may be derived to describe the evolution of $\phi$, the fraction of molten rock by volume, in the Earth. These equations have two power nonlinearities which specify the constitutive realitions for bulk viscosity and permeability in terms of $\phi$. Previously, they have been shown to admit solitary wave solutions. For a particular relation between exponents, we observe the equation to be Hamiltonian; it can be viewed as a generalization of the Benjamin-Bona-Mahoney equation. We prove that the solitary waves are nonlinearly stable, by showing that they are constrained local minimizers of an appropriate time-invariant Lyapunov functional. A consequence is an extension of the regime of global in time well-posedness for this class of equations to (large) data, which include a neighborhood of a solitary wave. Finally, we observe that these equations have {\it compactons}, solitary traveling waves with compact spatial support at each time.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 16:04:04 GMT" }, { "version": "v2", "created": "Thu, 17 Jan 2008 04:15:47 GMT" }, { "version": "v3", "created": "Thu, 17 Jan 2008 22:13:55 GMT" } ]
2008-01-18T00:00:00
[ [ "Simpson", "Gideon", "" ], [ "Weinstein", "Michael I.", "" ], [ "Rosenau", "Philip", "" ] ]
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801.0556
Fabien Durand
Fabien Durand (LAMFA)
Sur les ensembles d'entiers reconnaissables
null
Journal de Th\'eorie des Nombres de Bordeaux 10 (1998) 65-84
null
null
math.NT math.CO
null
Let U and V be two Bertrand numeration systems, and, a and b the two Parry numbers there are naturally associated with. Suppose they are multiplicatively independent. We prove that, if E is a subset of positive integers which is both U and V recognizable, then E is a finite union of arithmetical progressions.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 16:07:06 GMT" } ]
2008-01-04T00:00:00
[ [ "Durand", "Fabien", "", "LAMFA" ] ]
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801.0557
Jacco van Loon
Jacco Th. van Loon (Keele University, UK)
The connection between mass loss and nucleosynthesis
8 pages, including 3 colour figures. To appear in the AIP proceedings of "The IXth Torino Workshop on Evolution and Nucleosynthesis in AGB Stars". Also available from http://www.astro.keele.ac.uk/~jacco/research/ecology.html
null
10.1063/1.2916981
null
astro-ph
null
I discuss the relationship between mass loss and nucleosynthesis on the Asymptotic Giant Branch (AGB). Because of thermal pulses and possibly other mixing processes, products of nucleosynthesis can be brought to the surface of AGB stars, increasingly so as the star becomes more luminous, cooler, and unstable against pulsation of its tenuous mantle. As a result, mass loss is at its most extreme when dredge-up is too. As the high rate of mass loss truncates AGB evolution, it determines the enrichment of interstellar space with the AGB nucleosynthesis products. The changing composition of the stellar atmosphere also affects the mass-loss process, most obviously in the formation of dust grains - which play an important role in driving the wind of AGB stars.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 16:12:31 GMT" } ]
2015-05-13T00:00:00
[ [ "van Loon", "Jacco Th.", "", "Keele University, UK" ] ]
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801.0558
Fabien Durand
Fabien Durand (LAMFA), Adel Guerziz (LAMFA), Michel Koskas (LAMFA)
Words and morphisms with Sturmian erasures
null
Bulletin of the Belgian Mathematical Society 11, 4 (2004) 575-588
null
null
math.CO cs.DM
null
We say $x \in \{0,1,2 \}^{\NN}$ is a word with Sturmian erasures if for any $a\in \{0,1,2 \}$ the word obtained erasing all $a$ in $x$ is a Sturmian word. A large family of such words is given coding trajectories of balls in the game of billiards in the cube. We prove that the monoid of morphisms mapping all words with Sturmian erasures to words with Sturmian erasures is not finitely generated.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 16:16:53 GMT" } ]
2008-01-04T00:00:00
[ [ "Durand", "Fabien", "", "LAMFA" ], [ "Guerziz", "Adel", "", "LAMFA" ], [ "Koskas", "Michel", "", "LAMFA" ] ]
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801.0559
Francois Renard
Alexander Rozhko (PGP), Yuri Podladchikov (PGP), Fran\c{c}ois Renard (PGP, LGIT)
Failure patterns caused by localized rise in pore-fluid overpressure and effective strength of rocks
null
Geophysical Research Letters 34 (2007) L22304
10.1029/2007GL031696
null
physics.geo-ph
null
In order to better understand the interaction between pore-fluid overpressure and failure patterns in rocks we consider a porous elasto-plastic medium in which a laterally localized overpressure line source is imposed at depth below the free surface. We solve numerically the fluid filtration equation coupled to the gravitational force balance and poro-elasto-plastic rheology equations. Systematic numerical simulations, varying initial stress, intrinsic material properties and geometry, show the existence of five distinct failure patterns caused by either shear banding or tensile fracturing. The value of the critical pore-fluid overpressure at the onset of failure is derived from an analytical solution that is in excellent agreement with numerical simulations. Finally, we construct a phase-diagram that predicts the domains of the different failure patterns and at the onset of failure.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 16:19:02 GMT" } ]
2008-01-04T00:00:00
[ [ "Rozhko", "Alexander", "", "PGP" ], [ "Podladchikov", "Yuri", "", "PGP" ], [ "Renard", "François", "", "PGP, LGIT" ] ]
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801.056
Francois Renard
Magali Rossi (LGCA, PGP), Olivier Vidal (LGCA), Bernd Wunder (GFZ), Fran\c{c}ois Renard (PGP, LGIT)
Influence of time, temperature, confining pressure and fluid content on the experimental compaction of spherical grains
null
Tectonophysics 441 (2007) 47-65
10.1016/j.tecto.2007.05.001
null
physics.geo-ph
null
Theoretical models of compaction processes, such as for example intergranular pressure-solution (IPS), focus on deformation occurring at the contacts between spherical grains that constitute an aggregate. In order to investigate the applicability of such models, and to quantify the deformation of particles within an aggregate, isostatic experiments were performed in cold-sealed vessels on glass sphere aggregates at 200 MPa confining pressure and 350 degrees C with varying amounts of fluid.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 16:24:52 GMT" } ]
2008-01-04T00:00:00
[ [ "Rossi", "Magali", "", "LGCA, PGP" ], [ "Vidal", "Olivier", "", "LGCA" ], [ "Wunder", "Bernd", "", "GFZ" ], [ "Renard", "François", "", "PGP, LGIT" ] ]
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801.0561
Krzysztof Pachucki
Krzysztof Pachucki, Jacek Komasa
Ortho-para transition in molecular hydrogen
4 pages, submitted to Phys. Rev. A
null
10.1103/PhysRevA.77.030501
null
physics.chem-ph physics.atom-ph
null
The radiative ortho-para transition in the molecular hydrogen is studied. This highly forbidden transition is very sensitive to relativistic and subtle nonadiabatic effects. Our result for the transition rate in the ground vibrational level $\Gamma(J=1\to J=0) = 6.20(62)\cdot 10^{-14} \iyr$ is significantly lower in comparison to all the previous approximate calculations. Experimental detection of such a weak line by observation of, for example, the cold interstellar molecular hydrogen is at present unlikely.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 16:25:31 GMT" } ]
2009-11-13T00:00:00
[ [ "Pachucki", "Krzysztof", "" ], [ "Komasa", "Jacek", "" ] ]
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801.0562
Mikhail Erementchouk
M. V. Erementchouk, L. I. Deych, H. Noh, H. Cao, A. A. Lisyansky
Radiative energy transfer in disordered photonic crystals
27 pages, 4 figures
J. Phys.: Condens. Matter 21, 175401 (2009)
10.1088/0953-8984/21/17/175401
null
cond-mat.dis-nn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The difficulty of description of the radiative transfer in disordered photonic crystals arises from the necessity to consider on the equal footing the wave scattering by periodic modulations of the dielectric function and by its random inhomogeneities. We resolve this difficulty by approaching this problem from the standpoint of the general multiple scattering theory in media with arbitrary regular profile of the dielectric function. We use the general asymptotic solution of the Bethe-Salpeter equation in order to show that for a sufficiently weak disorder the diffusion limit in disordered photonic crystals is presented by incoherent superpositions of the modes of the ideal structure with weights inversely proportional to the respective group velocities. The radiative transfer and the diffusion equations are derived as a relaxation of long-scale deviations from this limiting distribution. In particular, it is shown that in general the diffusion is anisotropic unless the crystal has sufficiently rich symmetry, say, the square lattice in 2D or the cubic lattice in 3D. In this case, the diffusion is isotropic and only in this case the effect of the disorder can be characterized by the single mean-free-path depending on frequency.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 16:41:22 GMT" }, { "version": "v2", "created": "Thu, 15 Oct 2009 13:08:29 GMT" }, { "version": "v3", "created": "Fri, 16 Oct 2009 00:40:11 GMT" } ]
2009-10-16T00:00:00
[ [ "Erementchouk", "M. V.", "" ], [ "Deych", "L. I.", "" ], [ "Noh", "H.", "" ], [ "Cao", "H.", "" ], [ "Lisyansky", "A. A.", "" ] ]
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801.0563
Tobias Ambjornsson
Ludvig Lizana and Tobias Ambj\"ornsson
Single-File diffusion in a Box
5 pages, 4 figures
Phys. Rev. Lett. 100, 200601 (2008).
10.1103/PhysRevLett.100.200601
null
cond-mat.soft cond-mat.stat-mech
null
We study diffusion of (fluorescently) tagged hard-core interacting particles of finite size in a finite one-dimensional system. We find an exact analytical expression for the tagged particle probability density using a coordinate Bethe-ansatz, from which the mean square displacement is calculated. The analysis show the existence of three regimes of drastically different behavior for short, intermediate and large times. The results show excellent agreement with stochastic simulations (Gillespie algorithm). The findings of the Letter holds promise for the development of novel bio-nano sensors.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 16:43:31 GMT" }, { "version": "v2", "created": "Wed, 5 Mar 2008 21:55:50 GMT" } ]
2009-11-13T00:00:00
[ [ "Lizana", "Ludvig", "" ], [ "Ambjörnsson", "Tobias", "" ] ]
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801.0564
Timothy Perutz
Timothy Perutz
Hamiltonian handleslides for Heegaard Floer homology
24 pages, 2 figure. To appear in Proceedings of the 14th Gokova Geometry-Topology Conference. V2 has more detailed explanation of application to Heegaard Floer homology
null
null
null
math.SG math.GT
null
A $g$-tuple of disjoint, linearly independent circles in a Riemann surface of genus $g$ determines a `Heegaard torus' in its $g$-fold symmetric product. Changing the circles by a handleslide produces a new torus. It is proved that, for symplectic forms with certain properties, these two tori are Hamiltonian-isotopic Lagrangian submanifolds. This provides an alternative route to the handleslide-invariance of Ozsvath-Szabo's Heegaard Floer homology.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 16:59:18 GMT" }, { "version": "v2", "created": "Wed, 27 Feb 2008 01:06:03 GMT" } ]
2008-02-27T00:00:00
[ [ "Perutz", "Timothy", "" ] ]
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801.0565
Tomohiro Hasumi
Tomohiro Hasumi and Yoji Aizawa
Statistical Properties of the Inter-occurrence Times in the Two-dimensional Stick-slip Model of Earthquakes
8 pages, 5 figures, contribution to the conference proceeding of 21COE International Symposium, Tokyo, Japan Sept 13-14 2007
null
10.1142/9789812793379_0009
null
cond-mat.stat-mech cond-mat.other
null
We study earthquake interval time statistics, paying special attention to inter-occurrence times in the two-dimensional (2D) stick-slip (block-slider) model. Inter-occurrence times are the time interval between successive earthquakes on all faults in a region. We select stiffness and friction parameters as tunable parameters because these physical quantities are considered as essential factors in describing fault dynamics. It is found that inter-occurrence time statistics depend on the parameters. Varying stiffness and friction parameters systematically, we optimize these parameters so as to reproduce the inter-occurrence time statistics in natural seismicity. For an optimal case, earthquakes produced by the model obey the Gutenberg-Richter law, which states that the magnitude-frequency distribution exhibits the power law with an exponent approximately unity.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 16:36:31 GMT" } ]
2017-08-23T00:00:00
[ [ "Hasumi", "Tomohiro", "" ], [ "Aizawa", "Yoji", "" ] ]
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801.0566
Silvio Paolo Sorella
M.A.L. Capri, V.E.R. Lemes, R.F. Sobreiro, S.P. Sorella, R. Thibes
The gluon and ghost propagators in Euclidean Yang-Mills theory in the maximal Abelian gauge: taking into account the effects of the Gribov copies and of the dimension two condensates
final version, to appear in Physical Review D
Phys.Rev.D77:105023,2008
10.1103/PhysRevD.77.105023
null
hep-th hep-lat hep-ph
null
The infrared behavior of the gluon and ghost propagators is studied in SU(2) Euclidean Yang-Mills theory in the maximal Abelian gauge within the Gribov-Zwanziger framework. The nonperturbative effects associated with the Gribov copies and with the dimension two condensates are simultaneously encoded into a local and renormalizable Lagrangian. The resulting behavior turns out to be in good agreement with the lattice data.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 17:08:00 GMT" }, { "version": "v2", "created": "Tue, 1 Apr 2008 11:43:16 GMT" } ]
2008-11-26T00:00:00
[ [ "Capri", "M. A. L.", "" ], [ "Lemes", "V. E. R.", "" ], [ "Sobreiro", "R. F.", "" ], [ "Sorella", "S. P.", "" ], [ "Thibes", "R.", "" ] ]
[ 0.0007500731, 0.0628973022, -0.0035477197, 0.0256787334, -0.0301491208, 0.0737613812, -0.0429105163, -0.0892517939, -0.0215462241, -0.0187652279, 0.0510975607, 0.0108770747, -0.1076011732, 0.0921627432, 0.017010862, 0.0141129075, -0.0655483454, 0.0482905731, 0.0381802209, 0.0738653466, -0.1029228568, -0.0681993887, 0.0620136224, 0.092734538, -0.0467051454, -0.1143587306, 0.0708504319, 0.0107991034, 0.0502138808, 0.0326182283, 0.0154514238, -0.0259776264, -0.0054255421, -0.1301610321, -0.0444439612, 0.0798431858, -0.0459774099, 0.0181154627, -0.0123650376, 0.0452236794, -0.0623774901, 0.0527609587, -0.1372304708, 0.0863408446, 0.038778007, -0.0114878546, -0.0494341627, -0.0216501877, -0.0392718278, -0.0104287369, 0.0402334817, -0.0205715764, 0.0701226965, 0.00501619, -0.1234034672, 0.0309028476, 0.0370886177, 0.0636250377, -0.0410391912, -0.1134230718, -0.0653924048, -0.0362569168, -0.0531508178, 0.0177775845, -0.0694469362, -0.0231316518, -0.0998559669, 0.0048115137, 0.0523191206, 0.113215141, -0.0771401599, -0.0271601994, 0.0530208647, -0.0182324201, 0.0703826025, 0.0285896827, 0.0402854607, 0.0190251339, 0.0285636932, 0.0732935518, 0.0287976079, 0.0149835926, 0.0299152043, 0.0056204717, -0.0280178897, -0.0184403453, 0.0011200333, 0.0969970003, -0.0489403382, 0.0842096135, 0.0296812896, 0.0492782183, -0.0183623731, -0.0256657377, 0.0803629979, -0.0307469051, 0.1225717664, -0.0644567385, -0.0623774901, 0.0382581949, -0.0021458506, 0.0047108, -0.008420961, -0.0665879697, 0.1707063913, -0.0297592618, -0.0906552821, -0.0578551218, 0.0087718349, -0.0108965682, 0.011169469, 0.0832219645, 0.0414550416, 0.0868606567, -0.0221699998, -0.0927865133, -0.1221559197, -0.0253668465, -0.0442880169, 0.1396216154, 0.0463412777, 0.0226768162, 0.0662760809, -0.0367767289, 0.0670038238, -0.0174527019, 0.0335798822, -0.1826620847, -0.1304729134, 0.0728776976, 0.1838056743, -0.0543723777, -0.0044573913, -0.0485244878, -0.0360230021, 0.0216112006, 0.0143468231, -0.0193630122, 0.1172696799, -0.0325662494, -0.0235994831, 0.1064575836, 0.0958534107, 0.081974417, 0.0249380004, 0.1081209853, 0.0067380685, 0.0462633036, 0.1102002338, -0.0097529804, -0.0415849946, 0.0183103923, 0.1439880431, -0.0151525317, -0.0397656485, -0.0203376617, 0.0675756112, -0.0076932237, 0.0530728474, -0.1274580061, -0.0103377691, 0.0585308783, -0.0421307981, 0.0234045535, 0.0497200564, 0.0314746425, -0.1404533088, -0.0351393186, -0.0186222792, -0.0605581477, 0.0131837428, -0.0339697413, -0.0582709722, 0.016361095, 0.0505257659, -0.022338938, -0.0415590033, -0.068043448, -0.0700707138, 0.0581670105, 0.0300191678, 0.0149576021, -0.018713247, 0.0210913885, -0.1231955439, 0.0328001641, -0.0564516298, 0.0567635149, 0.0081545571, 0.0333199762, 0.0068290355, 0.0721499622, 0.0535406806, 0.1493940949, 0.0579071045, -0.072721757, 0.0509156249, 0.0409872085, -0.0612858832, 0.0501878895, -0.0334239379, 0.0626373962, 0.0410651825, -0.0629492849, -0.0285636932, -0.0210524034, 0.148666352, 0.0025194658, -0.0158152934, 0.0444439612, -0.0070564537, 0.0215592198, 0.0414810292, 0.0039180862, -0.1589586437, -0.0048050159, -0.109888345, 0.0427805632, 0.1076011732, 0.0418189093, -0.0010209441, 0.0336318649, 0.0064196833, 0.1026629508, -0.0177645888, 0.0352952629, 0.0622735284, -0.0514614284, -0.0371146053, -0.01465871, 0.065080516, -0.0158022977, -0.0506037399, -0.0945018977, 0.0976207703, -0.0620656013, 0.0716821328, 0.0452236794, -0.0192590505, -0.0383101739, 0.0209874269, -0.0155553864, 0.0470690131, 0.0047043022, -0.0287976079, 0.0008390097, -0.0157763064, -0.0182454158, 0.0870165974, 0.0639889091, -0.0681993887, 0.0796352625, 0.0284597296, -0.0250809491, -0.0687192008, -0.0201167408 ]
801.0567
Yogesh Singh
Yogesh Singh, S. Ramakrishnan
Crystal growth and ambient and high pressure study of the reentrant superconductor Tm_2Fe_3Si_5
7 pages, 8 figures
null
10.1088/0953-8984/20/23/235243
null
cond-mat.str-el cond-mat.supr-con
null
We report single crystal growth of the reentrant superconductor Tm_2Fe_3Si_5, and measurements of the anisotropic static magnetic susceptibility \chi(T) and isothermal magnetization M(H), ac susceptibility \chi_ac(T), electrical resistivity \rho(T) and heat capacity C(T) at ambient pressure and \chi_ac(T) at high pressure. The magnetic susceptibility along the c-axis \chi_c(T) shows a small maximum around 250 K and does not follow the Curie-Weiss behavior while the magnetic susceptibility along the a-axis \chi_a(T) follows a Curie-Weiss behavior between 130 K and 300 K with a Weiss temperature \theta and an effective magnetic moment \mu_eff which depend on the temperature range of the fit. The easy axis of magnetization is perpendicular to the c-axis and \chi_a/\chi_c = 3.2 at 1.8 K. The ambient pressure \chi_ac(T) and C(T) measurements confirm bulk antiferromagnetic ordering at T_N = 1.1 K. The sharp drop in \chi_ac below T_N is suggestive of the existence of a spin-gap. We observe superconductivity only under applied pressures P\geq 2 kbar. The temperature-pressure phase diagram showing the non-monotonic dependence of the superconducting transition temperature T_c on pressure P is presented.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 17:23:21 GMT" } ]
2009-11-13T00:00:00
[ [ "Singh", "Yogesh", "" ], [ "Ramakrishnan", "S.", "" ] ]
[ 0.1016997844, -0.0752558485, -0.0199696422, -0.0753055587, 0.0226040948, 0.1286407858, -0.0483894125, -0.0526890382, -0.0389948562, -0.134009093, -0.0538322888, -0.0099599678, -0.0077915154, 0.0769955814, 0.0368326195, 0.0134083657, -0.0647180453, 0.020044202, 0.0239834525, 0.0252882522, -0.0363106988, -0.062282417, -0.0589023679, 0.0328809433, 0.0120414328, -0.0298736896, 0.0802265182, -0.0001419358, 0.0539814085, -0.0201063361, 0.0861416012, -0.059001781, -0.0226786546, -0.0620338842, -0.0969776511, 0.0500794388, -0.0331791826, -0.0088105015, -0.0659110025, 0.0439406671, -0.0509990118, 0.0364101119, -0.078188546, 0.1373891532, 0.0631274283, -0.0383238196, -0.0491598658, 0.0516949035, -0.0101028746, -0.0075119156, -0.0069402894, -0.0866386741, 0.0088788485, -0.0850977674, -0.0113641806, 0.0415796041, -0.0623818301, 0.1358979493, -0.026046278, -0.0642706826, -0.0087732216, -0.1168105975, -0.0057224766, -0.0213614274, -0.0490604527, 0.0205288418, -0.0417535752, 0.0905157924, 0.0809721127, 0.0143403653, -0.0167262834, -0.0806241706, 0.0584052987, -0.0867380872, 0.0427974164, -0.032756675, -0.0178198293, -0.0003009582, -0.0485633872, 0.0098419143, -0.0704343095, -0.032831233, -0.0106682871, -0.0091273813, 0.0087545821, -0.0088664219, -0.018478442, -0.0366834998, -0.0773932338, -0.0785364881, 0.0581070594, 0.0092578614, -0.0015719724, 0.0869369134, -0.0391191244, -0.0798288584, 0.0047438773, -0.0086800214, -0.0534346364, 0.0633759648, -0.016875403, 0.0480911732, -0.0242692661, 0.05944914, 0.1600553691, 0.086539261, -0.0248781722, -0.0755540878, -0.1027933285, -0.0603935644, 0.1418627501, -0.060443271, 0.0487125069, 0.0572620481, -0.0583058856, -0.026518492, -0.0019789455, -0.1129334792, -0.0591509007, 0.1035886332, -0.0274877716, 0.1178047359, 0.0554726087, -0.0104818875, -0.0332785957, -0.0001497995, 0.0797791556, -0.0771447048, -0.0525896251, 0.0044456376, 0.1484240294, -0.035962753, -0.0154463379, -0.069092229, 0.0243189726, -0.0140669784, 0.0304950234, -0.0662092417, 0.0416044556, -0.009444261, -0.0173476171, 0.0427725613, 0.0690425187, 0.0725219846, 0.1418627501, 0.013669326, 0.0139302853, 0.0642209798, 0.1204888895, -0.0201187618, -0.0526890382, -0.039715603, 0.036882326, -0.0203424413, 0.0668057203, -0.1490205079, 0.0794809163, 0.0208146553, 0.0305198766, -0.0234366804, 0.0403369367, 0.0544287674, -0.0277860109, -0.0029932717, 0.0464508533, 0.0070024226, -0.0767967552, -0.001189076, -0.1013518348, -0.0768961683, 0.0586041287, 0.0073193028, -0.0459040813, -0.0103327679, 0.1351026446, 0.0919572785, 0.0298488364, -0.0748581961, -0.0790335536, 0.143851012, -0.0069278628, -0.0157694314, -0.0025412519, -0.0025008651, 0.0303459037, 0.0015952724, 0.0021171921, 0.1219800934, 0.0205785483, 0.0538322888, -0.0903169587, 0.0636742041, 0.0777411833, -0.0264439322, -0.0805744603, -0.1281437129, 0.07008636, 0.0732675865, -0.042921681, 0.0527884513, 0.0860918984, -0.0262948126, 0.006424583, -0.0209389217, -0.0577591136, -0.0318619572, 0.0620835908, 0.060443271, -0.129833743, -0.0450839214, 0.0730190501, 0.0445868559, 0.0237970538, 0.0108546875, 0.0147628719, 0.0836562738, -0.1372897327, -0.0605923906, -0.0290038232, 0.1066704467, -0.018478442, 0.0234615337, -0.0542299412, 0.156377092, 0.0417784303, 0.1133311391, -0.0113455402, -0.0104197543, 0.0433441885, 0.0010065595, 0.0277114511, 0.0298985429, 0.0813200623, 0.0504273847, -0.1000097543, -0.0451833345, 0.0626800731, 0.0048091174, 0.0712296143, -0.0688436925, -0.0095623145, 0.0145640448, -0.0381747, 0.1402721405, 0.0356396586, 0.038721472, -0.0530369841, -0.0526393317, 0.0560690872, 0.0310169421, -0.0154214846, 0.0231508669, 0.0009265628, 0.0519931428, -0.0548264235, -0.1051792502 ]
801.0568
Alen Orbani\'c
Alen Orbanic, Marko Petkovsek, Tomaz Pisanski, Primoz Potocnik
Counting One-Vertex Maps
8 pages, 4 tables
null
null
null
math.CO
null
The number of distinct maps (pre-maps) with a single vertex and valence $d$ is computed for any value of $d$. The types of maps (pre-maps) that we consider depend on whether the underlaying graph (pre-graph) is signed or unsigned and directed or undirected.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 17:26:14 GMT" } ]
2008-01-04T00:00:00
[ [ "Orbanic", "Alen", "" ], [ "Petkovsek", "Marko", "" ], [ "Pisanski", "Tomaz", "" ], [ "Potocnik", "Primoz", "" ] ]
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801.0569
Lars Freyhammer
L. M. Freyhammer, D. W. Kurtz, M. S. Cunha, G. Mathys, V. G. Elkin and J.D. Riley
A search for rapid pulsations among 9 luminous Ap stars
Accepted by MNRAS main journal
null
10.1111/j.1365-2966.2008.12913.x
null
astro-ph
null
The rapidly oscillating Ap stars are of importance for studying the atmospheric structure of stars where the process of chemical element diffusion is significant. We have performed a survey for rapid oscillations in a sample of 9 luminous Ap stars, selected from their location in the colour-magnitude diagram as more evolved main-sequence Ap stars that are inside the instability strip for rapidly oscillating Ap (roAp) stars. Until recently this region was devoid of stars with observed rapid pulsations. We used the VLT UV-Visual Echelle Spectrograph (UVES) to obtain high time resolution spectroscopy to make the first systematic spectroscopic search for rapid oscillations in this region of the roAp instability strip. We report 9 null-detections with upper limits for radial-velocity amplitudes of 20 - 65 m/s and precisions of 7 - 20 m/s for combinations of Nd and Pr lines. Cross-correlations confirm these null-results. At least six stars are magnetic and we provide magnetic field measurements for four of them, of which three are newly discovered magnetic stars. It is found that four stars have magnetic fields smaller than ~ 2 kG, which according to theoretical predictions might be insufficient for suppressing envelope convection around the magnetic poles for more evolved Ap stars. Suppression of convection is expected to be essential for the opacity mechanism acting in the hydrogen ionisation zone to drive the high-overtone roAp pulsations efficiently. Our null-results suggest that the more evolved roAp stars may require particularly strong magnetic fields to pulsate. Three of the studied stars do, however, have magnetic fields stronger than 5 kG.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 17:32:16 GMT" } ]
2009-11-13T00:00:00
[ [ "Freyhammer", "L. M.", "" ], [ "Kurtz", "D. W.", "" ], [ "Cunha", "M. S.", "" ], [ "Mathys", "G.", "" ], [ "Elkin", "V. G.", "" ], [ "Riley", "J. D.", "" ] ]
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801.057
Amit Bhatia
Amit Bhatia (1), Emilio Frazzoli (2) ((1) University of California at Los Angeles, (2) Massachusetts Institute of Technology)
Sampling-Based Resolution-Complete Algorithms for Safety Falsification of Linear Systems
19 pages, 11 figures, Accepted to appear in Hybrid Systems: Computation and Control, 2008
null
null
null
math.OC
null
In this paper, we describe a novel approach for checking safety specifications of a dynamical system with exogenous inputs over infinite time horizon that is guaranteed to terminate in finite time with a conclusive answer. We introduce the notion of resolution completeness for analysis of safety falsification algorithms and propose sampling-based resolution-complete algorithms for safety falsification of linear time-invariant discrete time systems over infinite time horizon. The algorithms are based on deterministic incremental search procedures, exploring the reachable set for feasible counter examples to safety at increasing resolution levels of the input. Given a target resolution of inputs, the algorithms are guaranteed to terminate either with a reachable state that violates the safety specification, or prove that no input exists at the given resolution that violates the specification.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 20:39:17 GMT" } ]
2008-01-04T00:00:00
[ [ "Bhatia", "Amit", "" ], [ "Frazzoli", "Emilio", "" ] ]
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801.0571
Olivier Krebs
K. Kowalik, O. Krebs, A. Lema\^itre, J. A. Gaj, and P. Voisin
Optical alignment and polarization conversion of neutral exciton spin in individual InAs/GaAs quantum dots
5 pages, 3 figures
null
10.1103/PhysRevB.77.161305
null
cond-mat.mtrl-sci
null
We investigate exciton spin memory in individual InAs/GaAs self-assembled quantum dots via optical alignment and conversion of exciton polarization in a magnetic field. Quasiresonant phonon-assisted excitation is successfully employed to define the initial spin polarization of neutral excitons. The conservation of the linear polarization generated along the bright exciton eigenaxes of up to 90% and the conversion from circular- to linear polarization of up to 47% both demonstrate a very long spin relaxation time with respect to the radiative lifetime. Results are quantitatively compared with a model of pseudo-spin 1/2 including heavy-to-light hole mixing.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 17:51:35 GMT" } ]
2009-11-13T00:00:00
[ [ "Kowalik", "K.", "" ], [ "Krebs", "O.", "" ], [ "Lemaître", "A.", "" ], [ "Gaj", "J. A.", "" ], [ "Voisin", "P.", "" ] ]
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801.0572
Johann Rafelski
Johann Rafelski (Arizona), and Jean Letessier (Arizona and Paris-LPTHE)
Strangeness enhancement at LHC
Presented at SQM07, to appear in JPG special issue. One table with predictions
J.Phys.G35:044042,2008
10.1088/0954-3899/35/4/044042
null
hep-ph nucl-th
null
We study production of strangeness in the hot QGP fireball in conditions achieved at LHC, and use these results to obtain soft (strange) hadron multiplicities. We compare the chemical equilibrium and non-equilibrium conditions and identify characteristic experimental observables.
[ { "version": "v1", "created": "Thu, 3 Jan 2008 20:32:36 GMT" } ]
2008-11-26T00:00:00
[ [ "Rafelski", "Johann", "", "Arizona" ], [ "Letessier", "Jean", "", "Arizona and\n Paris-LPTHE" ] ]
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