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712.3879
Jun Yan
Jun Yan, Erik A. Henriksen, Philip Kim, Aron Pinczuk
Observation of Anomalous Phonon Softening in Bilayer Graphene
4 figures
Phys. Rev. Lett. 101, 136804 (2008)
10.1103/PhysRevLett.101.136804
null
cond-mat.mes-hall
null
The interaction of electron-hole pairs with lattice vibrations exhibits a wealth of intriguing physical phenomena. The Kohn anomaly is a renowned example where electron-phonon coupling leads to non-analytic phonon dispersion at specific momentum nesting the Fermi surface. Here we report evidence of another type of phonon anomaly discovered by low temperature Raman spectroscopy in bilayer graphene where the charge density is modulated by the electric field effect. This anomaly, arising from charge-tunable modulations of particle-hole pairs that are resonantly coupled to lattice vibrations, is predicted to exhibit a logarithmic divergence in the long-wavelength optical-phonon energy. In a non-uniform bilayer of graphene, the logarithmic divergence is abated by charge density inhomogeneity leaving as a vestige an anomalous phonon softening. The observed softening marks the first confirmation of the phonon anomaly as a key signature of the resonant deformation-potential electron-phonon coupling. The high sensitivity of the phonon softening to charge density non-uniformity creates significant venues to explore the interplay between fundamental interactions and disorder in the atomic layers.
[ { "version": "v1", "created": "Sat, 22 Dec 2007 21:27:31 GMT" } ]
2009-11-13T00:00:00
[ [ "Yan", "Jun", "" ], [ "Henriksen", "Erik A.", "" ], [ "Kim", "Philip", "" ], [ "Pinczuk", "Aron", "" ] ]
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712.388
Paul van Loosdrecht
D. M. Sagar, D. Fausti, S. Yue, C. A. Kuntscher, S. van Smaalen, and P. H. M. van Loosdrecht
A Raman study of the Charge-Density-Wave State in A$_{0.3}$MoO$_3$ (A = K,Rb)
13 pages, 7 figures
null
10.1088/1367-2630/10/2/023043
null
cond-mat.str-el
null
We report a comparative Raman spectroscopic study of the quasi-one-dimensional charge-density-wave systems \ab (A = K, Rb). The temperature and polarization dependent experiments reveal charge-coupled vibrational Raman features. The strongly temperature-dependent collective amplitudon mode in both materials differ by about 3 cm, thus revealing the role of alkali atom. We discus the observed vibrational features in terms of charge-density-wave ground state accompanied by change in the crystal symmetry. A frequency-kink in some modes seen in \bb between T = 80 K and 100 K supports the first-order lock-in transition, unlike \rb. The unusually sharp Raman lines(limited by the instrumental response) at very low temperatures and their temperature evolution suggests that the decay of the low energy phonons is strongly influenced by the presence of the temperature dependent charge density wave gap.
[ { "version": "v1", "created": "Sat, 22 Dec 2007 21:52:56 GMT" } ]
2009-11-13T00:00:00
[ [ "Sagar", "D. M.", "" ], [ "Fausti", "D.", "" ], [ "Yue", "S.", "" ], [ "Kuntscher", "C. A.", "" ], [ "van Smaalen", "S.", "" ], [ "van Loosdrecht", "P. H. M.", "" ] ]
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712.3881
John Maroulas
John Maroulas
Further results on the Craig-Sakamoto equation
International Conference of Applied and Engineering Mathematics (ICAEM 2007), London
null
null
null
math.RA
null
In this paper necessary and sufficient conditions are stated for the Craig-Sakamoto equation det(I-sA-tB) = det(I-sA)det(I-tB), for all scalars s, t. Moreover, spectral properties for A and B are investigated.
[ { "version": "v1", "created": "Sat, 22 Dec 2007 22:08:48 GMT" } ]
2007-12-27T00:00:00
[ [ "Maroulas", "John", "" ] ]
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712.3882
Izabella Laba
Izabella Laba and Malabika Pramanik
Arithmetic progressions in sets of fractional dimension
42 pages
Geom. Funct. Anal. 19 (2009), 429-456
10.1007/s00039-009-0003-9
null
math.CA math.NT
null
Let $E\subset\rr$ be a closed set of Hausdorff dimension $\alpha$. We prove that if $\alpha$ is sufficiently close to 1, and if $E$ supports a probabilistic measure obeying appropriate dimensionality and Fourier decay conditions, then $E$ contains non-trivial 3-term arithmetic progressions.
[ { "version": "v1", "created": "Sat, 22 Dec 2007 22:13:13 GMT" }, { "version": "v2", "created": "Fri, 11 Jan 2008 00:46:02 GMT" } ]
2013-06-11T00:00:00
[ [ "Laba", "Izabella", "" ], [ "Pramanik", "Malabika", "" ] ]
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712.3883
John Maroulas
M. Adam and J. Maroulas
The generalized Levinger transformation
8th Workshop on "Numerical Ranges and Numerical Radii" (WONRA), University of Bremen, 2006
null
null
null
math.RA math.NA
null
In this paper, we present new results relating the numerical range of a matrix $A$ with generalized Levinger transformation $\mathcal{L}(A,\alpha,\beta) = \alphaH_A +\betaS_A$, where $H_A$ and $S_A$, are respectively the Hermitian and skew-hermitian parts of $A$. Using these results, we derive expressions for eigenvalues and eigenvectors of the perturbed matrix $A + \mathcal{L}(E,\alpha,\beta)$, for a fixed matrix $E$ and $\alpha, \beta$ are real parameters.
[ { "version": "v1", "created": "Sat, 22 Dec 2007 22:24:19 GMT" } ]
2007-12-27T00:00:00
[ [ "Adam", "M.", "" ], [ "Maroulas", "J.", "" ] ]
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712.3884
Jonathan C. Mattingly
Martin Hairer, Jonathan C. Mattingly
Slow energy dissipation in anharmonic oscillator chains
29 pages, 1 figure Corrected version fixing error in equation (2.12) and a few typos
null
null
null
math-ph math.MP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the dynamic behavior at high energies of a chain of anharmonic oscillators coupled at its ends to heat baths at possibly different temperatures. In our setup, each oscillator is subject to a homogeneous anharmonic pinning potential $V_1(q_i) =|q_i|^{2k}/2k$ and harmonic coupling potentials $V_2(q_i- q_{i-1}) = (q_i- q_{i-1})^2/2$ between itself and its nearest neighbors. We consider the case $k > 1$ when the pinning potential is stronger then the coupling potential. At high energy, when a large fraction of the energy is located in the bulk of the chain, breathers appear and block the transport of energy through the system, thus slowing its convergence to equilibrium. In such a regime, we obtain equations for an effective dynamics by averaging out the fast oscillation of the breather. Using this representation and related ideas, we can prove a number of results. When the chain is of length three and $k> 3/2$ we show that there exists a unique invariant measure. If $k > 2$ we further show that the system does not relax exponentially fast to this equilibrium by demonstrating that zero is in the essential spectrum of the generator of the dynamics. When the chain has five or more oscillators and $k> 3/2$ we show that the generator again has zero in its essential spectrum. In addition to these rigorous results, a theory is given for the rate of decrease of the energy when it is concentrated in one of the oscillators without dissipation. Numerical simulations are included which confirm the theory.
[ { "version": "v1", "created": "Sat, 22 Dec 2007 22:53:57 GMT" }, { "version": "v2", "created": "Wed, 25 Mar 2009 12:29:04 GMT" } ]
2009-03-25T00:00:00
[ [ "Hairer", "Martin", "" ], [ "Mattingly", "Jonathan C.", "" ] ]
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712.3885
Eric Braaten
Eric Braaten and Meng Lu
Line Shapes of the Z(4430)
4 pages, 1 figure
Phys.Rev.D79:051503,2009
10.1103/PhysRevD.79.051503
null
hep-ph
null
The Belle Collaboration recently discovered the first manifestly exotic meson: Z^+(4430), which decays into psi' pi^+ and therefore has quark content c c-bar u d-bar. The proximity of its mass to the D_1 D-bar^* threshold has motivated the interpretation of the Z^+ as a charm meson molecule whose constituents are an S-wave superposition of D_1^+ D-bar^{*0}$ and D^{*+} D-bar_1^0$. If this interpretation is correct, the small ratio of the binding energy of the Z^+ to the width Gamma_1 of its constituent D_1 can be exploited to predict properties of its line shapes. Its full width at half maximum in the channel psi' pi^+ should be approximately sqrt{3} Gamma_1 = 35 MeV, which is consistent with the measured width of the Z^+. The Z^+ should also decay into D^* D-bar^* pi through decay of its constituent D_1. The peak in the line shape for D^* D-bar^* pi should be at a higher energy than the peak in the line shape for psi' pi^+ by about Gamma_1/sqrt{12} = 6 MeV. The line shape in D^* D-bar^* pi should also be broader and asymmetric, with a shoulder on the high energy side that can be attributed to a threshold enhancement in the production of D_1 D-bar^*.
[ { "version": "v1", "created": "Sat, 22 Dec 2007 23:10:26 GMT" } ]
2009-03-24T00:00:00
[ [ "Braaten", "Eric", "" ], [ "Lu", "Meng", "" ] ]
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712.3886
Qayum Khan
Qayum Khan
Calculation of UNil for the cyclic group of order two
15 pages
Forum Mathematicum, Volume 22, Issue 2 (2010), 221--239
10.1515/FORUM.2010.012
null
math.AT math.KT
null
Cappell's unitary nilpotent groups UNil(R;R,R) are calculated for the integral group ring R=Z[C_2] of the cyclic group C_2 of order two. Specifically, they are determined as modules over the Verschiebung algebra V using the Connolly--Ranicki isomorphism and the Connolly--Davis relations.
[ { "version": "v1", "created": "Sun, 23 Dec 2007 01:24:54 GMT" } ]
2010-06-07T00:00:00
[ [ "Khan", "Qayum", "" ] ]
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712.3887
Robert R. Tucci
Robert R. Tucci
QuanTree and QuanLin, Two Special Purpose Quantum Compilers
14 pages (files: 1 .tex, 1 .sty, 10 .pdf).Ver2 of paper, for software ver. 1.1 instead of 1.0
null
null
null
quant-ph
null
This paper introduces QuanTree v1.1 and QuanLin v1.1, two Java applications available for free. (Source code included in the distribution.) Each application compiles a different type of input quantum evolution operator. The applications output a quantum circuit that is approximately equal to the input evolution operator. QuanTree compiles an input evolution operator whose Hamiltonian is proportional to the incidence matrix of a balanced, binary tree graph. QuanLin compiles an input evolution operator whose Hamiltonian is proportional to the incidence matrix of a line (open string) graph. Both applications also output an error, defined as the distance in the Frobenius norm between the input evolution operator and the output quantum circuit.
[ { "version": "v1", "created": "Sun, 23 Dec 2007 00:13:04 GMT" }, { "version": "v2", "created": "Sun, 17 Feb 2008 08:48:22 GMT" } ]
2008-02-17T00:00:00
[ [ "Tucci", "Robert R.", "" ] ]
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712.3888
Yaroslav Aulin
Sergey N. Savenkov and Yaroslav V. Aulin
Orthogonalization Properties of Linear Deterministic Polarization Elements
17 pages, 10 figures
null
null
null
physics.optics
null
The conditions under which a linear anisotropic polarization element orthogonalizes several polarization states of input totally polarized light were studied in the paper. The criterion for orthogonalization was obtained in the form of inequality for anisotropy parameters. Orthogonalization properties of polarization elements with the most important anisotropy types were investigated. The parameters under which orthogonalization occurs, and the states that are orthogonalized were found. The loci of these states on the Poincare sphere were given for sake of illustration in each case.
[ { "version": "v1", "created": "Sun, 23 Dec 2007 00:45:13 GMT" } ]
2007-12-27T00:00:00
[ [ "Savenkov", "Sergey N.", "" ], [ "Aulin", "Yaroslav V.", "" ] ]
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712.3889
Joshua Zirbel
J. J. Zirbel, K.-K. Ni, S. Ospelkaus, T. L. Nicholson, M. L. Olsen, C. E. Wieman, J. Ye, D. S. Jin, and P. S. Julienne
Heteronuclear molecules in an optical dipole trap
7 pages, 7 figures
Phys. Rev. A 78, 013416 (2008)
10.1103/PhysRevA.78.013416
null
cond-mat.other
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We report on the creation and characterization of heteronuclear KRb Feshbach molecules in an optical dipole trap. Starting from an ultracold gas mixture of K-40 and Rb-87 atoms, we create as many as 25,000 molecules at 300 nK by rf association. Optimizing the association process, we achieve a conversion efficiency of 25%. We measure the temperature dependence of the rf association process and find good agreement with a phenomenological model that has previously been applied to Feshbach molecule creation by slow magnetic-field sweeps. We also present a measurement of the binding energy of the heteronuclear molecules in the vicinity of the Feshbach resonance and provide evidence for Feshbach molecules as deeply bound as 26 MHz.
[ { "version": "v1", "created": "Sun, 23 Dec 2007 01:24:17 GMT" }, { "version": "v2", "created": "Fri, 22 Aug 2008 18:32:31 GMT" } ]
2008-08-22T00:00:00
[ [ "Zirbel", "J. J.", "" ], [ "Ni", "K. -K.", "" ], [ "Ospelkaus", "S.", "" ], [ "Nicholson", "T. L.", "" ], [ "Olsen", "M. L.", "" ], [ "Wieman", "C. E.", "" ], [ "Ye", "J.", "" ], [ "Jin", "D. S.", "" ], [ "Julienne", "P. S.", "" ] ]
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712.389
Prof. Dr. M. W. Wu
J. Y. Fu, M. Q. Weng, and M. W. Wu
Spin-orbit coupling in bulk GaAs
8 pages, 3 figures, Physica E, in press
Physica E 40, 2890 (2008).
10.1016/j.physe.2008.02.006
null
cond-mat.mtrl-sci cond-mat.other
null
We study the spin-orbit coupling in the whole Brillouin zone for GaAs using both the $sp^3s^{\ast}d^5$ and $sp^3s^{\ast}$ nearest-neighbor tight-binding models. In the $\Gamma$-valley, the spin splitting obtained is in good agreement with experimental data. We then further explicitly present the coefficients of the spin splitting in GaAs $L$ and $X$ valleys. These results are important to the realization of spintronic device and the investigation of spin dynamics far away from equilibrium.
[ { "version": "v1", "created": "Sun, 23 Dec 2007 02:30:24 GMT" }, { "version": "v2", "created": "Fri, 1 Feb 2008 18:27:18 GMT" }, { "version": "v3", "created": "Fri, 1 Feb 2008 23:19:46 GMT" } ]
2008-06-05T00:00:00
[ [ "Fu", "J. Y.", "" ], [ "Weng", "M. Q.", "" ], [ "Wu", "M. W.", "" ] ]
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712.3891
Moses Fayngold
Moses Fayngold
The Dynamics of Relativistic Length Contraction and the Ehrenfest Paradox
A few minor changes in the text. Footnote added on page 17. Corrected typo in Eq. (28)-(29.)
null
null
null
physics.class-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Relativistic kinematics is usually considered only as a manifestation of pseudo-Euclidean (Lorentzian) geometry of space-time. However, as it is explicitly stated in General Relativity, the geometry itself depends on dynamics, specifically, on the energy-momentum tensor. We discuss a few examples, which illustrate the dynamical aspect of the length-contraction effect within the framework of Special Relativity. We show some pitfalls associated with direct application of the length contraction formula in cases when an extended object is accelerated. Our analysis reveals intimate connections between length contraction and the dynamics of internal forces within the accelerated system. The developed approach is used to analyze the correlation between two congruent disks - one stationary and one rotating (the Ehrenfest paradox). Specifically, we consider the transition of a disk from the state of rest to a spinning state under the applied forces. It reveals the underlying physical mechanism in the corresponding transition from Euclidean geometry of stationary disk to Lobachevsky's (hyperbolic) geometry of the spinning disk in the process of its rotational boost. A conclusion is made that the rest mass of a spinning disk or ring of a fixed radius must contain an additional term representing the potential energy of non-Euclidean circumferential deformation of its material. Possible experimentally observable manifestations of Lobachevsky's geometry of rotating systems are discussed.
[ { "version": "v1", "created": "Sun, 23 Dec 2007 03:28:52 GMT" }, { "version": "v2", "created": "Sun, 15 Nov 2009 00:39:12 GMT" }, { "version": "v3", "created": "Thu, 16 Apr 2020 17:48:46 GMT" } ]
2020-04-17T00:00:00
[ [ "Fayngold", "Moses", "" ] ]
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712.3892
J. Harnad
J. Harnad and A. Yu. Orlov
Determinantal identity for multilevel systems and finite determinantal processes
17 pages
J. Anal. Math. Phys. 2, 105-121 (2012)
null
preprint CRM-3250 (2007)
math-ph cond-mat.stat-mech hep-th math.MP math.PR
null
We give a simple algebraic derivation of a useful determinantal identity for multilevel systems such as random matrix chains and finite determinantal point processes, with applications to the calculation of point correlators, gap probabililties and Janossy densities.
[ { "version": "v1", "created": "Sun, 23 Dec 2007 03:51:51 GMT" } ]
2014-10-07T00:00:00
[ [ "Harnad", "J.", "" ], [ "Orlov", "A. Yu.", "" ] ]
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712.3893
R. G. H. Robertson
R. G. H. Robertson (for the KATRIN Collaboration)
KATRIN: an experiment to measure the neutrino mass
3 pages, 1 figure. For Proceedings of Topics in Astroparticle and Underground Physics, Sendai, Sept. 2007. To be published in J.Phys.: Conf. Series
J.Phys.Conf.Ser.120:052028,2008
10.1088/1742-6596/120/5/052028
null
nucl-ex
null
KATRIN is a very large scale tritium-beta-decay experiment to determine the mass of the neutrino. It is presently under construction at the Forschungszentrum Karlsruhe, and makes use of the Tritium Laboratory built there for the ITER project. The combination of a very large retarding-potential electrostatic-magnetic spectrometer and an intense gaseous molecular tritium source makes possible a sensitivity to neutrino mass of 0.2 eV, about an order of magnitude below present laboratory limits. The measurement is kinematic and independent of whether the neutrino is Dirac or Majorana. The status of the project is summarized briefly in this report.
[ { "version": "v1", "created": "Sun, 23 Dec 2007 04:34:19 GMT" } ]
2019-08-13T00:00:00
[ [ "Robertson", "R. G. H.", "", "for the KATRIN Collaboration" ] ]
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712.3894
Toshiki Nakashima
Toshiki Nakashima
Ultra-discretization of the G^(1)_2-Geometric Crystals to the D^(3)_4-Perfect Crystals
19 pages
null
null
null
math.QA math.RT
null
We obtain the affirmative answer to the conjecture in [15]. More precisely, let X be the affine geometric crystal of type G^(1)_2 in [15] and UD(X,T,\theta) a ultra-discretization of X with respect to a certain positive structure \theta. Then we show that UD(X,T,\theta) is isomorphic to the limit of coherent family of perfect crystals of type D^(3)_4 in [7].
[ { "version": "v1", "created": "Sun, 23 Dec 2007 04:58:28 GMT" } ]
2007-12-27T00:00:00
[ [ "Nakashima", "Toshiki", "" ] ]
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712.3895
Yeow Meng Chee
Yeow Meng Chee and Petteri Kaski
An Enumeration of Graphical Designs
16 pages
Journal of Combinatorial Designs, vol. 16, no. 1, pp. 70-85, 2008
10.1002/jcd.20137
null
math.CO
null
Let $\Psi(t,k)$ denote the set of pairs $(v,\lambda)$ for which there exists a graphical $t$-$(v,k,\lambda)$ design. Most results on graphical designs have gone to show the finiteness of $\Psi(t,k)$ when $t$ and $k$ satisfy certain conditions. The exact determination of $\Psi(t,k)$ for specified $t$ and $k$ is a hard problem and only $\Psi(2,3)$, $\Psi(2,4)$, $\Psi(3,4)$, $\Psi(4,5)$, and $\Psi(5,6)$ have been determined. In this paper, we determine completely the sets $\Psi(2,5)$ and $\Psi(3,5)$. As a result, we find more than 270000 inequivalent graphical designs, and more than 8000 new parameter sets for which there exists a graphical design. Prior to this, graphical designs are known for only 574 parameter sets.
[ { "version": "v1", "created": "Sun, 23 Dec 2007 05:29:02 GMT" } ]
2007-12-27T00:00:00
[ [ "Chee", "Yeow Meng", "" ], [ "Kaski", "Petteri", "" ] ]
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712.3896
Jiangping Wang
Jiangping Wang
Tighter and Stable Bounds for Marcum Q-Function
7 pages. Submitted to IEEE Transactions on Information Theory
null
null
null
cs.IT math.IT
null
This paper proposes new bounds for Marcum Q-function, which prove extremely tight and outperform all the bounds previously proposed in the literature. What is more, the proposed bounds are good and stable both for large values and small values of the parameters of the Marcum Q-function, where the previously introduced bounds are bad and even useless under some conditions. The new bounds are derived by refined approximations for the 0th order modified Bessel function in the integration region of the Marcum Q-function. They should be useful since they are always tight no matter the parameters are large or small.
[ { "version": "v1", "created": "Sun, 23 Dec 2007 07:50:15 GMT" } ]
2007-12-27T00:00:00
[ [ "Wang", "Jiangping", "" ] ]
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712.3897
Yuri A. Dabaghian
Yu. Dabaghian, A. G. Cohn, L. Frank
Topological Maps from Signals
posted by permission of ACM for personal use. The definitive version was published in (ACMGIS .07, November 7-9, 2007, Seattle, WA) ISBN 978-1-59593-914-2/07/11. 11 pages, 4 figures
proceedings of the 15th ACM International Symposium ACM GIS 2007, pp. 392-395
null
null
q-bio.QM q-bio.NC
null
We discuss the task of reconstructing the topological map of an environment based on the sequences of locations visited by a mobile agent -- this occurs in systems neuroscience, where one runs into the task of reconstructing the global topological map of the environment based on activation patterns of the place coding cells in hippocampus area of the brain. A similar task appears in the context of establishing wifi connectivity maps.
[ { "version": "v1", "created": "Sun, 23 Dec 2007 06:00:20 GMT" } ]
2007-12-27T00:00:00
[ [ "Dabaghian", "Yu.", "" ], [ "Cohn", "A. G.", "" ], [ "Frank", "L.", "" ] ]
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712.3898
Probhas Raychaudhri
Probhas Raychaudhuri
Effective Photon Hypothesis, Self Focusing of Laser Beams and Super Fluid
9 pages no figure
null
null
null
cond-mat.other hep-ph
null
The effective photon hypothesis of Panarella and Raychaudhuri shows that the self focusing of photon in the laser beam is inherent and it also shows that the the cause of phenomena of self focusing of intense laser radiation in solids is not actually the nonlinear intensity dependent refractive index. In the effective photon hypothesis the laser photon have much better chance than ordinary photon to undergo a phase transition to a superfluid state. If a super fluid photon in the laser beam can be realized then in the effective photon hypothesis gives interesting results. The effective photon hypothesis shows that if the average energy X-ray laser beams is $h\nu=10^{3}$ $eV \sim 10^{4}$ $eV$, we find that mass of the quasiparticles in the X-ray laser beams is in the range $10^{5}$ $eV \sim 10^{12}$ $eV$. Thus the mass of the quasipartcle in the X-ray laser beams can be $Z$-boson of the electroweak theory of weak interactions. It is possible that $W^{+}$ and $W^{-}$ can be originated from another vector boson whose mass is more than 200 GeV.
[ { "version": "v1", "created": "Sun, 23 Dec 2007 06:42:20 GMT" } ]
2007-12-31T00:00:00
[ [ "Raychaudhuri", "Probhas", "" ] ]
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712.3899
Vincent Laude
Vincent Laude (FEMTO-ST), Davy G\'erard (FEMTO-ST), Naima Khelfaoui (FEMTO-ST), Carlos F. Jerez-Hanckes (FEMTO-ST), Sarah Benchabane (FEMTO-ST), Abdelkrim Khelif (FEMTO-ST)
Annular interdigital transducer focuses piezoelectric surface waves to a single point
null
null
10.1063/1.2891055
null
cond-mat.mtrl-sci
null
We propose and demonstrate experimentally the concept of the annular interdigital transducer that focuses acoustic waves on the surface of a piezoelectric material to a single, diffraction-limited, spot. The shape of the transducing fingers follows the wave surface. Experiments conducted on lithium niobate substrates evidence that the generated surface waves converge to the center of the transducer, producing a spot that shows a large concentration of acoustic energy. This concept is of practical significance to design new intense microacoustic sources, for instance for enhanced acouto-optical interactions.
[ { "version": "v1", "created": "Sun, 23 Dec 2007 07:07:16 GMT" } ]
2013-09-23T00:00:00
[ [ "Laude", "Vincent", "", "FEMTO-ST" ], [ "Gérard", "Davy", "", "FEMTO-ST" ], [ "Khelfaoui", "Naima", "", "FEMTO-ST" ], [ "Jerez-Hanckes", "Carlos F.", "", "FEMTO-ST" ], [ "Benchabane", "Sarah", "", "FEMTO-ST" ], [ "Khelif", "Abdelkrim", "", "FEMTO-ST" ] ]
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712.39
Damien Eveillard
J\'er\'emie Bourdon (LINA), Damien Eveillard (LINA), Samuel Gabillard (LINA), Theo Merle (LINA, ENS Cachan)
Integrating heterogeneous knowledges for understanding biological behaviors: a probabilistic approach
10 pages
null
null
null
q-bio.QM
null
Despite recent molecular technique improvements, biological knowledge remains incomplete. Reasoning on living systems hence implies to integrate heterogeneous and partial informations. Although current investigations successfully focus on qualitative behaviors of macromolecular networks, others approaches show partial quantitative informations like protein concentration variations over times. We consider that both informations, qualitative and quantitative, have to be combined into a modeling method to provide a better understanding of the biological system. We propose here such a method using a probabilistic-like approach. After its exhaustive description, we illustrate its advantages by modeling the carbon starvation response in Escherichia coli. In this purpose, we build an original qualitative model based on available observations. After the formal verification of its qualitative properties, the probabilistic model shows quantitative results corresponding to biological expectations which confirm the interest of our probabilistic approach.
[ { "version": "v1", "created": "Sun, 23 Dec 2007 07:22:47 GMT" } ]
2009-09-29T00:00:00
[ [ "Bourdon", "Jérémie", "", "LINA" ], [ "Eveillard", "Damien", "", "LINA" ], [ "Gabillard", "Samuel", "", "LINA" ], [ "Merle", "Theo", "", "LINA, ENS Cachan" ] ]
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712.3901
Victor Fadin
V.S. Fadin, R. Fiore
The dipole form of the BFKL kernel in supersymmetric Yang--Mills theories
11 pages, LaTeX; added references for sections 4 and 5
Phys.Lett.B661:139-144,2008
10.1016/j.physletb.2008.01.046
null
hep-ph
null
The dipole (M\"{o}bius) representation of the colour singlet BFKL kernel in the next-to-leading order is found in supersymmetric Yang--Mills theories. Ambiguities of this form and its conformal properties are discussed.
[ { "version": "v1", "created": "Sun, 23 Dec 2007 07:34:53 GMT" }, { "version": "v2", "created": "Sun, 30 Dec 2007 06:49:06 GMT" } ]
2008-11-26T00:00:00
[ [ "Fadin", "V. S.", "" ], [ "Fiore", "R.", "" ] ]
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712.3902
Jiang Zeng
Mourad E.H. Ismail, Jiang Zeng
Addition Theorems Via Continued Fractions
34 pages
null
null
null
math.CA math.CO
null
We show connections between a special type of addition formulas and a theorem of Stieltjes and Rogers. We use different techniques to derive the desirable addition formulas. We apply our approach to derive special addition theorems for Bessel functions and confluent hypergeometric functions. We also derive several additions theorems for basic hypergeometric functions. Applications to the evaluation of Hankel determinants are also given .
[ { "version": "v1", "created": "Sun, 23 Dec 2007 08:29:50 GMT" } ]
2007-12-27T00:00:00
[ [ "Ismail", "Mourad E. H.", "" ], [ "Zeng", "Jiang", "" ] ]
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712.3903
L. C. Garcia de Andrade
Garcia de Andrade
Helical ${\alpha}$-dynamos as twisted magnetic flux tubes in Riemannian space
Departamento de Fisica Teorica-IF-UERJ-Brasil
null
null
null
astro-ph
null
Analytical solution of ${\alpha}$-dynamo equation representing strongly torsioned helical dynamo is obtained in the thin twisted Riemannian flux tubes approximation. The $\alpha$ factor possesses a fundamental contribution from torsion which is however weaken in the thin tubes approximation. It is shown that assuming that the poloidal component of the magnetic field is in principle time-independent, the toroidal magnetic field component grows very fast in time, actually it possesses a linear time dependence, while the poloidal component grows under the influence of torsion or twist of the flux tube. The toroidal component decays spatially with as $r^{-2}$ while vorticity may decay as $r^{-5}$ (poloidal component) where r represents the radial distance from the magnetic axis of flux tube. Toroidal component of vorticity decays as $r^{-1}$. In turbulent dynamos unbounded magnetic fields may decay at least as $r^{-3}$.
[ { "version": "v1", "created": "Sun, 23 Dec 2007 09:03:39 GMT" } ]
2007-12-27T00:00:00
[ [ "de Andrade", "Garcia", "" ] ]
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712.3904
Valery M. Biryukov
V.M. Biryukov
Comment on "Feasibility of an electron-based crystalline undulator"
4 pages, 1 figure
null
null
null
physics.acc-ph
null
Tabrizi et al. [physics/0701342] discuss the feasibility of an electron-based crystal undulator (e-CU) by planar channeling of 50 GeV electrons through a periodically bent crystal. We show that their scheme is not feasible. First, their undulator parameter is K >> 1 always, which destroys photon interference. Second, they overestimate the electron dechanneling length in e-CU by an order of magnitude, which shortens the number N of e-CU periods from 5-15 (as they hope) to just 1-2. This kills their e-CU concept again. We made first simulation of electron channeling in undulated crystal and conclude that an electron-based crystal wiggler is feasible with wiggler strength K=10 and number of periods N=2.
[ { "version": "v1", "created": "Sun, 23 Dec 2007 09:50:45 GMT" } ]
2007-12-27T00:00:00
[ [ "Biryukov", "V. M.", "" ] ]
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712.3905
Carlo Morpurgo
Thomas P. Branson, Luigi Fontana, Carlo Morpurgo
Moser-Trudinger and Beckner-Onofri's inequalities on the CR sphere
53 Pages. Several minor corrections and changes in v5. Pages 22-24 are revised. Section 2 is condensed and some proofs are omitted (but can still be found in v3). Some references are added. To appear in Annals of Mathematics
null
null
null
math.AP math.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We derive sharp Moser-Trudinger inequalities on the CR sphere. The first type is in the Adams form, for powers of the sublaplacian and for general spectrally defined operators on the space of CR-pluriharmonic functions. We will then obtain the sharp Beckner-Onofri inequality for CR-pluriharmonic functions on the sphere, and, as a consequence, a sharp logarithmic Hardy-Littlewood-Sobolev inequality in the form given by Carlen and Loss.
[ { "version": "v1", "created": "Sun, 23 Dec 2007 10:00:34 GMT" }, { "version": "v2", "created": "Wed, 21 May 2008 11:56:59 GMT" }, { "version": "v3", "created": "Sat, 27 Jun 2009 17:24:27 GMT" }, { "version": "v4", "created": "Tue, 22 May 2012 02:56:03 GMT" }, { "version": "v5", "created": "Tue, 30 Oct 2012 11:41:47 GMT" } ]
2012-10-31T00:00:00
[ [ "Branson", "Thomas P.", "" ], [ "Fontana", "Luigi", "" ], [ "Morpurgo", "Carlo", "" ] ]
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712.3906
Luca Dall'Asta
L. Dall'Asta, M. Marsili, P. Pin
Optimization in task--completion networks
18 pages, 3 figures, submitted to JSTAT
null
10.1088/1742-5468/2008/02/P02003
null
physics.soc-ph
null
We discuss the collective behavior of a network of individuals that receive, process and forward to each other tasks. Given costs they store those tasks in buffers, choosing optimally the frequency at which to check and process the buffer. The individual optimizing strategy of each node determines the aggregate behavior of the network. We find that, under general assumptions, the whole system exhibits coexistence of equilibria and hysteresis.
[ { "version": "v1", "created": "Sun, 23 Dec 2007 10:10:09 GMT" } ]
2009-11-13T00:00:00
[ [ "Dall'Asta", "L.", "" ], [ "Marsili", "M.", "" ], [ "Pin", "P.", "" ] ]
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712.3907
Hirotaka Yoshino
Hirotaka Yoshino
Highly distorted apparent horizons and the hoop conjecture
10 pages, 5 figures, submitted to PRD(R)
Phys.Rev.D77:041501,2008
10.1103/PhysRevD.77.041501
Alberta-Thy-22-07
gr-qc
null
By analyzing the apparent horizon (AH) formation in the collision of two pp-waves with rectangular sources in four dimensions, we study to what extent the AH can be distorted without violating the energy conditions. It is shown that the highly distorted AH can form in this system although it cannot be arbitrarily long. The hoop conjecture is examined for the formation of such highly distorted AHs, and our result gives a strong support to the hoop conjecture. We also point out the possible relation between the AH topology theorem and the hoop conjecture.
[ { "version": "v1", "created": "Sun, 23 Dec 2007 11:58:27 GMT" } ]
2008-11-26T00:00:00
[ [ "Yoshino", "Hirotaka", "" ] ]
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712.3908
Tam\'as Szabados
Tam\'as Szabados (Budapest University of Technology and Economics), Bal\'azs Sz\'ekely (Budapest University of Technology and Economics)
Stochastic integration based on simple, symmetric random walks
16 pages, some typos corrected
Journal of Theoretical Probability 22 (2009) 203-219
10.1007/s10959-007-0140-8
null
math.PR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A new approach to stochastic integration is described, which is based on an a.s. pathwise approximation of the integrator by simple, symmetric random walks. Hopefully, this method is didactically more advantageous, more transparent, and technically less demanding than other existing ones. In a large part of the theory one has a.s. uniform convergence on compacts. In particular, it gives a.s. convergence for the stochastic integral of a finite variation function of the integrator, which is not c\`adl\`ag in general.
[ { "version": "v1", "created": "Sun, 23 Dec 2007 10:48:42 GMT" }, { "version": "v2", "created": "Mon, 6 Jul 2009 19:31:38 GMT" } ]
2009-07-06T00:00:00
[ [ "Szabados", "Tamás", "", "Budapest University of Technology and Economics" ], [ "Székely", "Balázs", "", "Budapest University of Technology and Economics" ] ]
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712.3909
Peter Fiebig
Peter Fiebig
Lusztig's conjecture as a moment graph problem
17 pages; revised version with minor changes
Bull. London Math. Soc. (2010) 42(6): 957-972
10.1112/blms/bdq058
null
math.RT math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We show that Lusztig's conjecture on the irreducible characters of a reductive algebraic group over a field of positive characteristic is equivalent to the generic multiplicity conjecture, which gives a formula for the Jordan-H"older multiplicities of baby Verma modules over the corresponding Lie algebra. Then we give a short overview of a recent proof of the latter conjecture for almost all base fields via the theory of sheaves on moment graphs.
[ { "version": "v1", "created": "Sun, 23 Dec 2007 11:20:08 GMT" }, { "version": "v2", "created": "Tue, 1 Jul 2008 11:10:48 GMT" }, { "version": "v3", "created": "Wed, 25 Feb 2009 17:35:45 GMT" }, { "version": "v4", "created": "Tue, 7 Apr 2009 16:23:12 GMT" } ]
2011-01-13T00:00:00
[ [ "Fiebig", "Peter", "" ] ]
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712.391
Carl Bender
Carl M. Bender
Faster than Hermitian Time Evolution
This is a contribution to the Proc. of the Seventh International Conference ''Symmetry in Nonlinear Mathematical Physics'' (June 24-30, 2007, Kyiv, Ukraine), published in SIGMA (Symmetry, Integrability and Geometry: Methods and Applications) at http://www.emis.de/journals/SIGMA/
SIGMA 3 (2007), 126, 10 pages
10.3842/SIGMA.2007.126
null
hep-th
null
For any pair of quantum states, an initial state |I> and a final quantum state |F>, in a Hilbert space, there are many Hamiltonians H under which |I> evolves into |F>. Let us impose the constraint that the difference between the largest and smallest eigenvalues of H, E_max and E_min, is held fixed. We can then determine the Hamiltonian H that satisfies this constraint and achieves the transformation from the initial state to the final state in the least possible time \tau. For Hermitian Hamiltonians, \tau has a nonzero lower bound. However, among non-Hermitian PT-symmetric Hamiltonians satisfying the same energy constraint, \tau can be made arbitrarily small without violating the time-energy uncertainty principle. The minimum value of \tau can be made arbitrarily small because for PT-symmetric Hamiltonians the path from the vector |I> to the vector |F>, as measured using the Hilbert-space metric appropriate for this theory, can be made arbitrarily short. The mechanism described here is similar to that in general relativity in which the distance between two space-time points can be made small if they are connected by a wormhole. This result may have applications in quantum computing.
[ { "version": "v1", "created": "Sun, 23 Dec 2007 12:06:37 GMT" }, { "version": "v2", "created": "Thu, 27 Dec 2007 13:17:40 GMT" } ]
2008-04-25T00:00:00
[ [ "Bender", "Carl M.", "" ] ]
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712.3911
Shunsuke Yoshimura
Shunsuke Yoshimura, Aya Comuta, Noburo Ishii
N-systems, class polynomials for double eta-quotients and singular values of J-invariant function
12 pages
null
null
null
math.NT
null
Enge and Schertz gave the method of using the double eta-quotient for the construction of elliptic curves over finite fields. In their method, it is necessary to count the number of rational points of elliptic curves corresponding to solutions of the modular equation over a finite field, because in advance we can not know which solution of the modular equation is that corresponding to the modular invariant. We give a condition that the modular invariant is a multiple root of the modular polynomial. Consequently, we give a method to reduce the amount of computation in the process of counting the number of rational points.
[ { "version": "v1", "created": "Sun, 23 Dec 2007 12:15:22 GMT" } ]
2007-12-27T00:00:00
[ [ "Yoshimura", "Shunsuke", "" ], [ "Comuta", "Aya", "" ], [ "Ishii", "Noburo", "" ] ]
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712.3912
Martti Raidal
M. Kadastik, M. Raidal and L. Rebane
Direct determination of neutrino mass parameters at future colliders
A mistake corrected, experimental errors revised, new references added, conclusions unchanged
Phys.Rev.D77:115023,2008
10.1103/PhysRevD.77.115023
null
hep-ph
null
If the observed light neutrino masses are induced by their Yukawa couplings to singlet right-handed neutrinos, natural smallness of those renders direct collider tests of the electroweak scale neutrino mass mechanisms almost impossible both in the case of Dirac and Majorana (seesaw of type I) neutrinos. However, in the triplet Higgs seesaw scenario the smallness of light neutrino masses may come from the smallness of B-L breaking parameters, allowing sizable Yukawa couplings even for a TeV scale triplet. We show that, in this scenario, measuring the branching fractions of doubly charged Higgs to different same-charged lepton flavours at LHC and/or ILC experiments will allow one to measure the neutrino mass parameters which neutrino oscillation experiments are insensitive to, including the neutrino mass hierarchy, lightest neutrino mass and Majorana phases.
[ { "version": "v1", "created": "Wed, 26 Dec 2007 18:05:45 GMT" }, { "version": "v2", "created": "Tue, 29 Jan 2008 12:07:04 GMT" } ]
2008-11-26T00:00:00
[ [ "Kadastik", "M.", "" ], [ "Raidal", "M.", "" ], [ "Rebane", "L.", "" ] ]
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712.3913
Jan Winter
Jan-Christopher Winter, Frank Krauss
Initial-state showering based on colour dipoles connected to incoming parton lines
57 pages, 17 figures
JHEP 0807:040,2008
10.1088/1126-6708/2008/07/040
null
hep-ph
null
A parton-shower model for hadronic collisions based on the emission properties of QCD dipoles is proposed. This proposal therefore extends the well-known radiation pattern of pure final-state colour dipoles to QCD initial-state radiation, both of which are treated perturbatively. Corresponding dipole splitting functions are derived and the kinematics of all dipole splittings is discussed. Application to hadron production in electron-positron annihilation, to Drell-Yan lepton-pair and QCD jet production yields encouraging results.
[ { "version": "v1", "created": "Sun, 23 Dec 2007 13:55:28 GMT" } ]
2009-04-30T00:00:00
[ [ "Winter", "Jan-Christopher", "" ], [ "Krauss", "Frank", "" ] ]
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712.3914
Abdollah Langari
S. Mahmoudian and A. Langari
Phase diagram of the one dimensional anisotropic Kondo-necklace model
9 pages and 9 eps figures
Phys. Rev. B. 77, 24420 (2008)
10.1103/PhysRevB.77.024420
null
cond-mat.str-el cond-mat.stat-mech
null
The one dimensional anisotropic Kondo-necklace model has been studied by several methods. It is shown that a mean field approach fails to gain the correct phase diagram for the Ising type anisotropy. We then applied the spin wave theory which is justified for the anisotropic case. We have derived the phase diagram between the antiferromagnetic long range order and the Kondo singlet phases. We have found that the exchange interaction (J) between the itinerant spins and local ones enhances the quantum fluctuations around the classical long range antiferromagnetic order and finally destroy the ordered phase at the critical value, J_c. Moreover, our results show that the onset of anisotropy in the XY term of the itinerant interactions develops the antiferromagnetic order for J<J_c. This is in agreement with the qualitative feature which we expect from the symmetry of the anisotropic XY interaction. We have justified our results by the numerical Lanczos method where the structure factor at the antiferromagnetic wave vector diverges as the size of system goes to infinity.
[ { "version": "v1", "created": "Sun, 23 Dec 2007 14:17:06 GMT" }, { "version": "v2", "created": "Mon, 21 Jan 2008 08:16:45 GMT" } ]
2009-11-13T00:00:00
[ [ "Mahmoudian", "S.", "" ], [ "Langari", "A.", "" ] ]
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712.3915
Izumi Ojima
Takahiro Hasebe, Izumi Ojima and Hayato Saigo
No Zero Divisor for Wick Product in $(S)^{\ast}$}
5 pages
Infin. Dimens. Anal. Quantum. Probab. Relat. Top. 11, 307 (2008)
10.1142/S0219025708003087
RIMS-1620
math-ph math.MP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In White Noise Analysis (WNA), various random quantities are analyzed as elements of $(S)^{\ast}$, the space of Hida distributions ([1]). Hida distributions are generalized functions of white noise, which is to be naturally viewed as the derivative of the Brownian motion. On $(S)^{\ast}$, the Wick product is defined in terms of the $\mathcal{S}$-transform. We have found such a remarkable property that the Wick product has no zero devisors among Hida distributions. This result is a WNA version of Titchmarsh's theorem and is expected to play fundamental roles in developing the \textquotedblleft operational calculus\textquotedblright in WNA along the line of Mikusi\'{n}ski's version for solving differential equations.
[ { "version": "v1", "created": "Sun, 23 Dec 2007 14:17:59 GMT" }, { "version": "v2", "created": "Wed, 1 May 2013 06:36:10 GMT" } ]
2013-05-02T00:00:00
[ [ "Hasebe", "Takahiro", "" ], [ "Ojima", "Izumi", "" ], [ "Saigo", "Hayato", "" ] ]
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712.3916
Andreas Enge
Andreas Enge (INRIA Futurs)
Discrete logarithms in curves over finite fields
null
null
null
null
cs.CR cs.DM math.AG
null
A survey on algorithms for computing discrete logarithms in Jacobians of curves over finite fields.
[ { "version": "v1", "created": "Sun, 23 Dec 2007 14:21:12 GMT" } ]
2007-12-27T00:00:00
[ [ "Enge", "Andreas", "", "INRIA Futurs" ] ]
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712.3917
Debra A. Fischer
Debra A. Fischer, Geoffrey W. Marcy, R. Paul Butler, Steven S. Vogt, Greg Laughlin, Gregory W. Henry, David Abouav, Kathryn M. G. Peek, Jason T. Wright, John A. Johnson, Chris McCarthy, Howard Isaacson
Five Planets Orbiting 55 Cancri
accepted to ApJ
null
10.1086/525512
null
astro-ph
null
We report 18 years of Doppler shift measurements of a nearby star, 55 Cancri, that exhibit strong evidence for five orbiting planets. The four previously reported planets are strongly confirmed here. A fifth planet is presented, with an apparent orbital period of 260 days, placing it 0.78 AU from the star in the large empty zone between two other planets. The velocity wobble amplitude of 4.9 \ms implies a minimum planet mass \msini = 45.7 \mearthe. The orbital eccentricity is consistent with a circular orbit, but modest eccentricity solutions give similar \chisq fits. All five planets reside in low eccentricity orbits, four having eccentricities under 0.1. The outermost planet orbits 5.8 AU from the star and has a minimum mass, \msini = 3.8 \mjupe, making it more massive than the inner four planets combined. Its orbital distance is the largest for an exoplanet with a well defined orbit. The innermost planet has a semi-major axis of only 0.038 AU and has a minimum mass, \msinie, of only 10.8 \mearthe, one of the lowest mass exoplanets known. The five known planets within 6 AU define a {\em minimum mass protoplanetary nebula} to compare with the classical minimum mass solar nebula. Numerical N-body simulations show this system of five planets to be dynamically stable and show that the planets with periods of 14.65 and 44.3 d are not in a mean-motion resonance. Millimagnitude photometry during 11 years reveals no brightness variations at any of the radial velocity periods, providing support for their interpretation as planetary.
[ { "version": "v1", "created": "Sun, 23 Dec 2007 14:22:09 GMT" }, { "version": "v2", "created": "Thu, 27 Dec 2007 09:48:27 GMT" } ]
2009-11-13T00:00:00
[ [ "Fischer", "Debra A.", "" ], [ "Marcy", "Geoffrey W.", "" ], [ "Butler", "R. Paul", "" ], [ "Vogt", "Steven S.", "" ], [ "Laughlin", "Greg", "" ], [ "Henry", "Gregory W.", "" ], [ "Abouav", "David", "" ], [ "Peek", "Kathryn M. G.", "" ], [ "Wright", "Jason T.", "" ], [ "Johnson", "John A.", "" ], [ "McCarthy", "Chris", "" ], [ "Isaacson", "Howard", "" ] ]
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712.3918
Francois Hild
Fran\c{c}ois Hild (LMT), St\'ephane Roux (LMT)
Digital Image Mechanical Identification (DIMI)
to appear Experimental Mechanics (2008)
null
null
null
physics.class-ph
null
A continuous pathway from digital images acquired during a mechanical test to quantitative identification of a constitutive law is presented herein based on displacement field analysis. From images, displacement fields are directly estimated within a finite element framework. From the latter, the application of the equilibrium gap method provides the means for rigidity field evaluation. In the present case, a reconditioned formulation is proposed for a better stability. Last, postulating a specific form of a damage law, a linear system is formed that gives a direct access to the (non-linear) damage growth law in one step. The two last procedures are presented, validated on an artificial case, and applied to the case of a biaxial tension of a composite sample driven up to failure. A quantitative estimate of the quality of the determination is proposed, and in the last application, it is shown that no more than 7% of the displacement field fluctuations are not accounted for by the determined damage law.
[ { "version": "v1", "created": "Sun, 23 Dec 2007 14:24:19 GMT" } ]
2007-12-27T00:00:00
[ [ "Hild", "François", "", "LMT" ], [ "Roux", "Stéphane", "", "LMT" ] ]
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712.3919
Vladimir Pascalutsa
Vladimir Pascalutsa (ECT, Trento)
The Delta(1232) Resonance in Chiral Effective Field Theory
8 pages, 8 figs; prepared for the proceedings of the Intl Erice School ``Quarks in Hadrons and Nuclei'', 29th Course, 16--24 Sep 2007, Sicily, Italy
Prog.Part.Nucl.Phys.61:27-33,2008
10.1016/j.ppnp.2007.12.023
null
nucl-th
null
I discuss the problem of formulating the baryon chiral perturbation theory ($\chi$PT) in the presence of a light resonance, such as the $\Delta(1232)$, the lightest nucleon resonance. It is shown how to extend the power counting of $\chi$PT to correctly account for the resonant contributions. Recent applications of the resulting chiral effective-field theory to the description of pion production reactions in $\Delta$-resonance region are briefly reviewed.
[ { "version": "v1", "created": "Sun, 23 Dec 2007 14:29:00 GMT" } ]
2008-11-26T00:00:00
[ [ "Pascalutsa", "Vladimir", "", "ECT, Trento" ] ]
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712.392
David Lannes
Jerry L. Bona, David Lannes (IMB), Jean-Claude Saut (LM-Orsay)
Asymptotic Models for Internal Waves
null
null
null
null
math.AP physics.ao-ph
null
We derived here in a systematic way, and for a large class of scaling regimes, asymptotic models for the propagation of internal waves at the interface between two layers of immiscible fluids of different densities, under the rigid lid assumption and with a flat bottom. The full (Euler) model for this situation is reduced to a system of evolution equations posed spatially on $\R^d$, $d=1,2$, which involve two nonlocal operators. The different asymptotic models are obtained by expanding the nonlocal operators with respect to suitable small parameters that depend variously on the amplitude, wave-lengths and depth ratio of the two layers. We rigorously derive classical models and also some model systems that appear to be new. Furthermore, the consistency of these asymptotic systems with the full Euler equations is established.
[ { "version": "v1", "created": "Sun, 23 Dec 2007 14:26:46 GMT" } ]
2007-12-27T00:00:00
[ [ "Bona", "Jerry L.", "", "IMB" ], [ "Lannes", "David", "", "IMB" ], [ "Saut", "Jean-Claude", "", "LM-Orsay" ] ]
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712.3921
Francois Hild
V. Tarigopula (SIMLab), O.S. Hopperstad (SIMLab), M. Langseth (SIMLab), A.H. Clausen (SIMLab), Fran\c{c}ois Hild (LMT)
A study of localisation in dual-phase high-strength steels under dynamic loading using digital image correlation and FE analysis
null
International Journal of Solids and Structures 45 (2008) 601-619
10.1016/j.ijsolstr.2007.08.021
null
cond-mat.mtrl-sci
null
Tensile tests were conducted on dual-phase high-strength steel in a Split-Hopkinson Tension Bar at a strain-rate in the range of 150-600/s and in a servo-hydraulic testing machine at a strain-rate between 10-3 and 100/s. A novel specimen design was utilized for the Hopkinson bar tests of this sheet material. Digital image correlation was used together with high-speed photography to study strain localisation in the tensile specimens at high rates of strain. By using digital image correlation, it is possible to obtain in-plane displacement and strain fields during non-uniform deformation of the gauge section, and accordingly the strains associated with diffuse and localised necking may be determined. The full-field measurements in high strain-rate tests reveal that strain localisation started even before the maximum load was attained in the specimen. An elasto-viscoplastic constitutive model is used to predict the observed stress-strain behaviour and strain localisation for the dual-phase steel. Numerical simulations of dynamic tensile tests were performed using the non-linear explicit FE code LS-DYNA. Simulations were done with shell (plane stress) and brick elements. Good correlation between experiments and numerical predictions was achieved, in terms of engineering stress-strain behaviour, deformed geometry and strain fields. However, mesh density plays a role in the localisation of deformation in numerical simulations, particularly for the shell element analysis.
[ { "version": "v1", "created": "Sun, 23 Dec 2007 14:32:24 GMT" } ]
2007-12-27T00:00:00
[ [ "Tarigopula", "V.", "", "SIMLab" ], [ "Hopperstad", "O. S.", "", "SIMLab" ], [ "Langseth", "M.", "", "SIMLab" ], [ "Clausen", "A. H.", "", "SIMLab" ], [ "Hild", "François", "", "LMT" ] ]
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712.3922
Swarnali Bandopadhyay
Swarnali Bandopadhyay, Debasish Chaudhuri, Arun M. Jayannavar
A comparative study of two phenomenological models of dephasing in series and parallel resistors
7 pages, 9 figures
Physics Letters A 374 (2010) 813-818
10.1016/j.physleta.2009.12.004
null
cond-mat.mes-hall
null
We compare two phenomenological models of dephasing that are in use recently. We show that the stochastic absorption model leads to reasonable dephasing in series (double barrier) and parallel (ring) quantum resistors in presence and absence of magnetic flux. For large enough dephasing it leads to Ohm's law. On the other hand a random phase based statistical model that uses averaging over Gaussian random-phases, picked up by the propagators, leads to several inconsistencies. This can be attributed to the failure of this model to dephase interference between complementary electron waves each following time-reversed path of the other.
[ { "version": "v1", "created": "Sun, 23 Dec 2007 14:32:35 GMT" } ]
2010-05-28T00:00:00
[ [ "Bandopadhyay", "Swarnali", "" ], [ "Chaudhuri", "Debasish", "" ], [ "Jayannavar", "Arun M.", "" ] ]
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712.3923
Da-Xin Zhang
Yunfei Wu and Da-Xin Zhang
On Unparticles and K+ to pi+ Missing Energy
13 pages, 10 figures
null
null
null
hep-ph
null
We analyze the branching ratio and spectrum for the decay mode $K^+ \to\pi^++{\not}E$(missing energy) in the unparticle model, where an unparticle can also serve as the missing energy. A vector unparticle can even mediate the $K^+ \to \pi^+ +\nu \bar{\nu}$, resulting complicated interference with the Standard Model.
[ { "version": "v1", "created": "Sun, 23 Dec 2007 14:41:00 GMT" } ]
2007-12-27T00:00:00
[ [ "Wu", "Yunfei", "" ], [ "Zhang", "Da-Xin", "" ] ]
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712.3924
Valmir Barbosa
Elias Bareinboim, Valmir C. Barbosa
Descents and nodal load in scale-free networks
null
Physical Review E 77 (2008), 046111
10.1103/PhysRevE.77.046111
null
cond-mat.stat-mech
null
The load of a node in a network is the total traffic going through it when every node pair sustains a uniform bidirectional traffic between them on shortest paths. We show that nodal load can be expressed in terms of the more elementary notion of a node's descents in breadth-first-search (BFS or shortest-path) trees, and study both the descent and nodal-load distributions in the case of scale-free networks. Our treatment is both semi-analytical (combining a generating-function formalism with simulation-derived BFS branching probabilities) and computational for the descent distribution; it is exclusively computational in the case of the load distribution. Our main result is that the load distribution, even though it can be disguised as a power-law through subtle (but inappropriate) binning of the raw data, is in fact a succession of sharply delineated probability peaks, each of which can be clearly interpreted as a function of the underlying BFS descents. This find is in stark contrast with previously held belief, based on which a power law of exponent -2.2 was conjectured to be valid regardless of the exponent of the power-law distribution of node degrees.
[ { "version": "v1", "created": "Sun, 23 Dec 2007 15:19:31 GMT" } ]
2008-04-18T00:00:00
[ [ "Bareinboim", "Elias", "" ], [ "Barbosa", "Valmir C.", "" ] ]
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712.3925
Pascal Heus
Pascal Heus, Richard Gomez
QIS-XML: A metadata specification for Quantum Information Science
26 pages, 22 figures
null
null
null
cs.SE cs.DB quant-ph
null
While Quantum Information Science (QIS) is still in its infancy, the ability for quantum based hardware or computers to communicate and integrate with their classical counterparts will be a major requirement towards their success. Little attention however has been paid to this aspect of QIS. To manage and exchange information between systems, today's classic Information Technology (IT) commonly uses the eXtensible Markup Language (XML) and its related tools. XML is composed of numerous specifications related to various fields of expertise. No such global specification however has been defined for quantum computers. QIS-XML is a proposed XML metadata specification for the description of fundamental components of QIS (gates & circuits) and a platform for the development of a hardware independent low level pseudo-code for quantum algorithms. This paper lays out the general characteristics of the QIS-XML specification and outlines practical applications through prototype use cases.
[ { "version": "v1", "created": "Sun, 23 Dec 2007 15:24:35 GMT" } ]
2011-11-10T00:00:00
[ [ "Heus", "Pascal", "" ], [ "Gomez", "Richard", "" ] ]
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712.3926
Fedor Simkovic
Fedor Simkovic, Rastislav Dvornicky, Amand Faessler
Exact relativistic tritium beta-decay endpoint spectrum in a hadron model
6 pages, 1 figure
Phys.Rev.C77:055502,2008
10.1103/PhysRevC.77.055502
null
hep-ph
null
We present the relativistic calculation of the beta-decay of tritium in a hadron model. The elementary particle treatment of the transition 3H -> 3He + e^- + nu_e is performed in analogy with the description of the beta-decay of neutron. The effects of higher order terms of hadron current and nuclear recoil are taken into account in this formalism. The relativistic Kurie function is derived and presented in a simple form suitable for the determination of neutrino masses from the shape of the endpoint spectrum. A connection with the commonly used Kurie function is established.
[ { "version": "v1", "created": "Sun, 23 Dec 2007 15:25:53 GMT" }, { "version": "v2", "created": "Mon, 5 May 2008 15:44:38 GMT" } ]
2008-11-26T00:00:00
[ [ "Simkovic", "Fedor", "" ], [ "Dvornicky", "Rastislav", "" ], [ "Faessler", "Amand", "" ] ]
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712.3927
Stefan Mendach
S. Mendach, S. Kiravittaya, A. Rastelli, M. Benyoucef, R. Songmuang, O.G. Schmidt
Bidirectional wavelength tuning of semiconductor quantum dots as artificial atoms in an optical resonator
5 pages, 4 figures
null
null
null
cond-mat.other
null
We consider a pair of artificial atoms with different ground state energies. By means of finite element calculations we predict that the ground state energies can be tuned into resonance if the artificial atoms are placed into a flexible ring structure, which is elastically deformed by an external force. This concept is experimentally verified by embedding a low density of self-assembled quantum dots into the wall of a rolled up micro tube ring resonator. We demonstrate that quantum dots can elastically be tuned in- and out of resonance with each other or with the ring resonator modes.
[ { "version": "v1", "created": "Sun, 23 Dec 2007 15:46:26 GMT" } ]
2007-12-27T00:00:00
[ [ "Mendach", "S.", "" ], [ "Kiravittaya", "S.", "" ], [ "Rastelli", "A.", "" ], [ "Benyoucef", "M.", "" ], [ "Songmuang", "R.", "" ], [ "Schmidt", "O. G.", "" ] ]
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712.3928
Youngki Yoon
Youngki Yoon and Jing Guo
Effect of edge roughness in graphene nanoribbon transistors
null
Appl. Phys. Lett. 91, 073103 (2007)
10.1063/1.2769764
null
cond-mat.mes-hall
null
The effects of edge irregularity and mixed edge shapes on the characteristics of graphene nanoribbon transistors are examined by self-consistent atomistic simulations based on the non-equilibrium Green's function formalism. The minimal leakage current increases due to the localized states induced in the band gap, and the on-current decreases due to smaller quantum transmission and the self-consistent electrostatic effect in general. Although the ratio between the on-current and minimal leakage current decreases, the transistor still switches even in the presence of edge roughness. The variation between devices, however, can be large, especially for a short channel length.
[ { "version": "v1", "created": "Sun, 23 Dec 2007 15:52:18 GMT" } ]
2009-11-13T00:00:00
[ [ "Yoon", "Youngki", "" ], [ "Guo", "Jing", "" ] ]
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712.3929
Didier Sornette
Ivan Osorio, Mark G. Frei, Didier Sornette, John Milton, Ying-Cheng Lai
Epileptic Seizures: Quakes of the brain?
21 pages including 6 figures
null
null
null
physics.bio-ph physics.geo-ph
null
The concept of universality proposes that dynamical systems with the same power law behaviors are equivalent at large scales. We test this hypothesis on the Earth's crust and the epileptic brain, and discover that power laws also govern the distributions of seizure energies and recurrence times. This robust correspondence is extended over seven statistics, including the direct and inverse Omori laws. We also verify in an animal seizure model the earthquake-driven hypothesis that power law statistics co-exist with characteristic scales, as coupling between constitutive elements increases towards the synchronization regime. These observations point to the universality of the dynamics of coupled threshold oscillators for systems even as diverse as Earth and brain and suggest a general strategy for forecasting seizures, one of neurosciences' grails.
[ { "version": "v1", "created": "Sun, 23 Dec 2007 16:03:41 GMT" } ]
2007-12-27T00:00:00
[ [ "Osorio", "Ivan", "" ], [ "Frei", "Mark G.", "" ], [ "Sornette", "Didier", "" ], [ "Milton", "John", "" ], [ "Lai", "Ying-Cheng", "" ] ]
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712.393
Arunava Chakrabarti
Supriya Jana and Arunava Chakrabarti
Aharonov-Bohm ring with a side-coupled atomic cluster: magneto-transport and the selective switching effect
8 pages, 4 figures
null
10.1103/PhysRevB.77.155310
null
cond-mat.mes-hall
null
We report electronic transmission properties of a tight binding Aharonov-Bohm ring threaded by a magnetic flux, to one arm of which a finite cluster of atoms has been attached from one side. we demonstrate that, by suitably choosing the number of scatterers in each arm of the quantum ring and, by decoupling the ring from the atomic cluster, the transmission across the ring can be completely blocked when the flux threading the ring becomes equal to half the fundamental flux quantum. A transmission resonance then occurs immediately as the coupling between the ring and the impurity cluster is switched 'on'. It is shown that the delta-like transmission resonances occur precisely at the eigenvalues of the side coupled chain of atoms.Thw 'switching' effect can be observed either for all the eigenvalues of the isolated atomic cluster, or for a selected set of them, depending on the number of scatterers in the arms of the ring. The ring-dot coupling can be gradually increased to suppress the oscillations in the magneto-transmission completely. However, the suppression can lead either to a complete transparency or no transmission at all, occasionally accompanied by a reversal of phase at special values of the magnetic flux.
[ { "version": "v1", "created": "Sun, 23 Dec 2007 16:05:52 GMT" } ]
2009-11-13T00:00:00
[ [ "Jana", "Supriya", "" ], [ "Chakrabarti", "Arunava", "" ] ]
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712.3931
Youngki Yoon
Youngki Yoon, James Fodor, and Jing Guo
A Computational Study of Vertical Partial Gate Carbon Nanotube FETs
null
IEEE Trans. on Electron Devices (Jan. 2008)
10.1109/TED.2007.910561
null
cond-mat.mes-hall
null
A vertical partial gate carbon nanotube (CNT) field-effect transistor (FET), which is amenable to the vertical CNT growth process and offers the potential for a parallel CNT array channel, is simulated using a self-consistent atomistic approach. We show that the underlap between the gate and the bottom electrode (required for isolation between electrodes) is advantageous for transistor operation because it suppresses ambipolar conduction. A vertical CNTFET with a gate length that covers only 1/6 of the channel length has a much smaller minimum leakage current than one without underlap, while maintaining comparable on current. Both n-type and p-type transistor operations with balanced performance metrics can be achieved on a single partial gate FET by using proper bias schemes. Even with a gate underlap, it is demonstrated that increasing the CNT diameter still leads to a simultaneous increase of on current and minimum leakage current. Along with a partial gate, the simulated transistor features a significant amount of air between the surface of the channel CNT and the gate insulator, as is caused by the vertical CNT growth process. Filing this pore with a high-k insulator is shown to have the potential to decrease the on current, due to electrostatic phenomena at the source-channel contact.
[ { "version": "v1", "created": "Sun, 23 Dec 2007 16:06:01 GMT" } ]
2015-05-13T00:00:00
[ [ "Yoon", "Youngki", "" ], [ "Fodor", "James", "" ], [ "Guo", "Jing", "" ] ]
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712.3932
John Etnyre
Anar Akhmedov, John B. Etnyre, Thomas E. Mark, and Ivan Smith
A note on Stein fillings of contact manifolds
5 pages
null
null
null
math.SG math.GT
null
In this note we construct infinitely many distinct simply connected Stein fillings of a certain infinite family of contact 3--manifolds.
[ { "version": "v1", "created": "Sun, 23 Dec 2007 16:37:24 GMT" } ]
2007-12-27T00:00:00
[ [ "Akhmedov", "Anar", "" ], [ "Etnyre", "John B.", "" ], [ "Mark", "Thomas E.", "" ], [ "Smith", "Ivan", "" ] ]
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712.3933
Qi-Shu Yan
A.G. Akeroyd, Abdesslam Arhrib, Qi-Shu Yan
Charged Higgs bosons in the Next-to MSSM (NMSSM)
20 pages, 22 eps figures, more reference added
Eur.Phys.J.C55:653-665,2008
10.1140/epjc/s10052-008-0617-3
null
hep-ph
null
The charged Higgs boson decays $H^\pm\to W^\pm A_1$ and $H^\pm\to W^\pm h_i$ are studied in the framework of the next-to Minimal Supersymmetric Standard Model (NMSSM). It is found that the decay rate for $H^\pm\to W^\pm A_1$ can exceed the rates for the $\tau^\pm\nu$ and $tb$ channels both below and above the top-bottom threshold. The dominance of $H^\pm\to W^\pm A_1$ is most readily achieved when $A_1$ has a large doublet component and small mass. We also study the production process $pp\to H^\pm A_1$ at the LHC followed by the decay $H^\pm\to W^\pm A_1$ which leads to the signature $W^\pm A_1 A_1$. We suggest that $p p\to H^\pm A_1$ is a promising discovery channel for a light charged Higgs boson in the NMSSM with small or moderate $\tan\beta$ and dominant decay mode $H^\pm \to W^\pm A_1$. This $W^\pm A_1 A_1$ signature can also arise from the Higgsstrahlung process $pp\to W^\pm h_1$ followed by the decay $h_1\to A_1 A_1$. It is shown that there exist regions of parameter space where these processes can have comparable cross sections and we suggest that their respective signals can be distinguished at the LHC by using appropriate reconstruction methods.
[ { "version": "v1", "created": "Sun, 23 Dec 2007 18:07:05 GMT" }, { "version": "v2", "created": "Sat, 12 Jan 2008 16:58:13 GMT" } ]
2008-11-26T00:00:00
[ [ "Akeroyd", "A. G.", "" ], [ "Arhrib", "Abdesslam", "" ], [ "Yan", "Qi-Shu", "" ] ]
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712.3934
Gerhard Forst
G. Forst
A critical analysis of the GP-B mission. I: on the impossibility of a reliable measurement of the gravitomagnetic precession of the GP-B gyroscopes
This submission has been removed because 'G. Forst' is an apparent pseudonym, in violation of arXiv policies
null
null
null
gr-qc
null
This submission has been removed because 'G. Forst' is an apparent pseudonym, in violation of arXiv policies.
[ { "version": "v1", "created": "Sun, 23 Dec 2007 16:59:42 GMT" }, { "version": "v2", "created": "Fri, 11 Jan 2008 19:42:51 GMT" } ]
2014-02-14T00:00:00
[ [ "Forst", "G.", "" ] ]
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712.3935
Alexander Bolonkin
Alexander Bolonkin
AB Method of Irrigation without Water (Closed-loop water cycle)
22 pages, 12 figures
null
null
null
physics.gen-ph physics.ao-ph physics.soc-ph
null
Author suggests and researches a new revolutionary idea for a closed-loop irrigation method. He offers to cover a given site by a thin closed film with controlled heat conductivity and clarity located at an altitude of 50 300 m. The film is supported at altitude by small additional atmospheric overpressure and connected to the ground by thin cables. Authors show that this closed dome allows full control of the weather in a given region (the day is always fine, the rain is only at night, no strong winds). The dome (having control of the clarity of film and heat conductivity) converts the cold regions to subtropics, hot deserts and desolate wildernesses to prosperous regions with a temperate climate. This is a realistic and cheap method of evaporation economical irrigation and virtual weather control on Earth at the current time.
[ { "version": "v1", "created": "Wed, 26 Dec 2007 15:46:42 GMT" } ]
2007-12-27T00:00:00
[ [ "Bolonkin", "Alexander", "" ] ]
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712.3936
Juli\'an Mestre
Juli\'an Mestre
Lagrangian Relaxation and Partial Cover
20 pages, extended abstract appeared in STACS 2008
null
null
null
cs.DS cs.DM
null
Lagrangian relaxation has been used extensively in the design of approximation algorithms. This paper studies its strengths and limitations when applied to Partial Cover.
[ { "version": "v1", "created": "Sun, 23 Dec 2007 18:33:36 GMT" } ]
2007-12-27T00:00:00
[ [ "Mestre", "Julián", "" ] ]
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712.3937
Pieter Eendebak
Pieter Thijs Eendebak
Tangential symmetries of Darboux integrable systems
null
null
null
null
math.DG math.AP
null
In this paper we analyze the tangential symmetries of Darboux integrable decomposable exterior differential systems. The decomposable systems generalize the notion of a hyperbolic exterior differential system and include the classic notion of Darboux integrability for first order systems and second order scalar equations. For Darboux integrable systems the general solution can be found by integration (solving ordinary differential equations). We show that this property holds for our generalized systems as well. We give a geometric construction of the Lie algebras of tangential symmetries associated to the Darboux integrable systems. This construction has the advantage over previous constructions that our construction does not require the use of adapted coordinates and works for arbitrary dimension of the underlying manifold. In particular it works for the prolongations of decomposable exterior differential systems.
[ { "version": "v1", "created": "Sun, 23 Dec 2007 18:13:03 GMT" } ]
2007-12-27T00:00:00
[ [ "Eendebak", "Pieter Thijs", "" ] ]
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712.3938
Anzhong Wang
Anzhong Wang and N.O. Santos
The cosmological constant in the brane world of string theory on $S^{1}/Z_{2}$
Add two new figures, and some typos are corrected. Version to appear in Physics Letters B
Phys.Lett.B669:127-132,2008
10.1016/j.physletb.2008.09.044
null
hep-th astro-ph gr-qc hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Orbifold branes in string theory are investigated, and the general field equations on the branes are given explicitly for type II and heterotic string. It is shown that the effective cosmological constant on each of the two branes can be easily lowered to its current observational value, using large extra dimensions. This is also true for type I string. The radion stability is studied by using the Goldberger-Wise mechanism, and shown explicitly that it is stable. Therefore, brane world of string theory provides a viable and built-in mechanism for solving the long-standing cosmological constant problem. Applying the formulas to cosmology, we obtain the generalized Friedmann equations on each of the two branes.
[ { "version": "v1", "created": "Sun, 23 Dec 2007 19:40:53 GMT" }, { "version": "v2", "created": "Mon, 14 Apr 2008 14:38:06 GMT" }, { "version": "v3", "created": "Sat, 6 Sep 2008 14:01:42 GMT" } ]
2008-11-26T00:00:00
[ [ "Wang", "Anzhong", "" ], [ "Santos", "N. O.", "" ] ]
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712.3939
Simon DeDeo
Simon DeDeo (1), Dimitrios Psaltis (2) ((1) KICP, University of Chicago, (2) University of Arizona)
Stable, Accelerating Universes in Modified Gravity
5 pages, 1 figure, matches published version
Phys.Rev.D78:064013,2008
10.1103/PhysRevD.78.064013
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Modifications to gravity that add additional functions of the Ricci curvature to the Einstein-Hilbert action -- collectively known as $f(R)$ theories -- have been studied in great detail. When considered as complete theories of gravity they can generate non-perturbative deviations from the general relativistic predictions in the solar system, and the simplest models show instabilites on cosmological scales. Here we show that it is possible to treat $f(R)=R\pm\mu^4/R$ gravity in a perturbative fashion such that it shows no instabilities on cosmological scales and, in the solar system, is consistent with measurements of the PPN parameters. We show that such a theory produces a spatially flat, accelerating universe, even in the absence of dark energy and when the matter density is too small to close the universe in the general relativistic case.
[ { "version": "v1", "created": "Sun, 23 Dec 2007 18:39:06 GMT" }, { "version": "v2", "created": "Thu, 13 Nov 2008 01:35:17 GMT" } ]
2009-02-20T00:00:00
[ [ "DeDeo", "Simon", "" ], [ "Psaltis", "Dimitrios", "" ] ]
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712.394
David Lannes
Mathieu Colin and David Lannes
Short Pulses Approximations in Dispersive Media
null
null
null
null
math.AP
null
We derive various approximations for the solutions of nonlinear hyperbolic systems with fastly oscillating initial data. We first provide error estimates for the so-called slowly varying envelope, full dispersion, and Schr\"odinger approximations in a Wiener algebra; this functional framework allows us to give precise conditions on the validity of these models; we give in particular a rigorous proof of the ``practical rule'' which serves as a criterion for the use of the slowly varying envelope approximation (SVEA). We also discuss the extension of these models to short pulses and more generally to large spectrum waves, such as chirped pulses. We then derive and justify rigorously a modified Schr\"odinger equation with improved frequency dispersion. Numerical computations are then presented, which confirm the theoretical predictions.
[ { "version": "v1", "created": "Sun, 23 Dec 2007 18:58:44 GMT" } ]
2007-12-27T00:00:00
[ [ "Colin", "Mathieu", "" ], [ "Lannes", "David", "" ] ]
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712.3941
Dmitri A. Uzdensky
Dmitri A. Uzdensky (Princeton University and CMSO)
Self-Regulation of Solar Coronal Heating Process via Collisionless Reconnection Condition
4 pages; Phys. Rev. Lett., in press
Phys.Rev.Lett.99:261101,2007
10.1103/PhysRevLett.99.261101
null
astro-ph physics.plasm-ph physics.space-ph
null
I propose a new paradigm for solar coronal heating viewed as a self-regulating process keeping the plasma marginally collisionless. The mechanism is based on the coupling between two effects. First, coronal density controls the plasma collisionality and hence the transition between the slow collisional Sweet-Parker and the fast collisionless reconnection regimes. In turn, coronal energy release leads to chromospheric evaporation, increasing the density and thus inhibiting subsequent reconnection of the newly-reconnected loops. As a result, statistically, the density fluctuates around some critical level, comparable to that observed in the corona. In the long run, coronal heating can be represented by repeating cycles of fast reconnection events (nano-flares), evaporation episodes, and long periods of slow magnetic stress build-up and radiative cooling of the coronal plasma.
[ { "version": "v1", "created": "Sun, 23 Dec 2007 19:18:51 GMT" } ]
2008-11-26T00:00:00
[ [ "Uzdensky", "Dmitri A.", "", "Princeton University and CMSO" ] ]
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712.3942
Ettore Minguzzi
E. Minguzzi
Limit curve theorems in Lorentzian geometry
25 pages, 1 figure. v2: Misprints fixed, matches published version
J.Math.Phys.49:092501,2008
10.1063/1.2973048
null
gr-qc
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The subject of limit curve theorems in Lorentzian geometry is reviewed. A general limit curve theorem is formulated which includes the case of converging curves with endpoints and the case in which the limit points assigned since the beginning are one, two or at most denumerable. Some applications are considered. It is proved that in chronological spacetimes, strong causality is either everywhere verified or everywhere violated on maximizing lightlike segments with open domain. As a consequence, if in a chronological spacetime two distinct lightlike lines intersect each other then strong causality holds at their points. Finally, it is proved that two distinct components of the chronology violating set have disjoint closures or there is a lightlike line passing through each point of the intersection of the corresponding boundaries.
[ { "version": "v1", "created": "Sun, 23 Dec 2007 19:09:34 GMT" }, { "version": "v2", "created": "Thu, 4 Sep 2008 12:05:31 GMT" } ]
2008-11-26T00:00:00
[ [ "Minguzzi", "E.", "" ] ]
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712.3943
Michael Trusov
A.M.Badalian, Yu.A.Simonov, M.A.Trusov
The chiral transitions in heavy-light mesons
30 pages, 11 tables, 7 figures; ReVTeX 4; submitted to Phys. Rev. D
Phys.Rev.D77:074017,2008
10.1103/PhysRevD.77.074017
null
hep-ph
null
The mass shifts of the $P$-wave $D_s$ and $B_s$ mesons due to coupling to $DK$, $D^*K$ and $BK$, $B^*K$ channels are studied using the chiral quark-pion Lagrangian without fitting parameters. The strong mass shifts down $\sim 140$ MeV and $\sim 100$ MeV for $D^*_s(0^+)$ and $D_s(1^{+'})$ and $\sim 100$ MeV for $B^*_s(0^+)$ and $B_s(1^{+'})$ are calculated. Two factors are essential for large mass shifts: strong coupling of the $0^+$ and $1^{+'}$ states to the $S$-wave decay channel, containing a Nambu-Goldstone meson, and the chiral flip transitions due to the bispinor structure of both heavy-light mesons. The masses $M(B^*_s(0^+))=5695(10)$ MeV and $M(B_s(1^{+'}))=5730(15)$ MeV,very close to $M(B(0^+))$ and $M(B(1^{+'}))$, are predicted. Experimental limit on the width $\Gamma(D_{s1}(2536))<2.3$ MeV puts strong restrictions on admittable mixing angle between the $1^+$ and $1^{+'}$ states, $|\phi|<6^{\circ}$, which corresponds to the mixing angle $\theta$ between the $^3P_1$ and $^1P_1$ states, $29^{\circ}<\theta< 41^{\circ}$.
[ { "version": "v1", "created": "Sun, 23 Dec 2007 19:10:19 GMT" } ]
2008-11-26T00:00:00
[ [ "Badalian", "A. M.", "" ], [ "Simonov", "Yu. A.", "" ], [ "Trusov", "M. A.", "" ] ]
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712.3944
Kirill Zybin
K.P. Zybin, V.A. Sirota, A.S. Ilyin, A.V. Gurevich
Lagrangian structure functions in fully-developed hydrodynamical turbulence
null
null
10.1103/PhysRevLett.100.174504
null
physics.flu-dyn
null
The Lagrangian velocity structure functions in the inertial range of fully developed fluid turbulence are derived basing on the Navier-Stokes equations. For time $\tau$ much smaller than the correlation time, the structure functions are shown to obey the scaling relations $K_n(\tau)\propto \tau^{\zeta_n}$. The scaling exponents $\zeta_n$ are calculated analytically. The obtained values are in amazing agreement with the unique experimental results of the Bodenschatz group \cite{Bod2}. New notion -- the Lagrangian position structure functions $R_n(\tau)$ is introduced. All the $R_n$ of the order $n>3$ are shown to have a universal scaling.
[ { "version": "v1", "created": "Wed, 26 Dec 2007 15:46:38 GMT" } ]
2009-11-13T00:00:00
[ [ "Zybin", "K. P.", "" ], [ "Sirota", "V. A.", "" ], [ "Ilyin", "A. S.", "" ], [ "Gurevich", "A. V.", "" ] ]
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712.3945
Jose' P. S. Lemos
Jos\'e P. S. Lemos
Black hole entropy and the holographic principle
12 pages, article in "Advances in Physical Sciences", ed. Luis D. Carlos, (Aveiro University Press, 2008), contribution to the proceedings of the meeting held at the Universidade de Aveiro, September 2005
null
null
null
gr-qc astro-ph hep-th
null
Black holes monopolize nowadays the center stage of fundamental physics. Yet, they are poorly understood objects. Notwithstanding, from their generic properties, one can infer important clues to what a fundamental theory, a theory that includes gravitation and quantum mechanics, should give. Here we review the classical properties of black holes and their associated event horizons, as well as the quantum and thermodynamic properties, such as the temperature, derived from the Hawking radiation, and the entropy. Then, using the black hole properties we discuss a universal bound on the entropy for any object, or for any given region of spacetime, and finally we present the arguments, first given by 't Hooft, that, associating entropy with the number of quantum degrees of freedom, i.e., the logarithm of quantum states, via statistical physics, leads to the conclusion that the degrees of freedom of a given region are in the area A of the region, rather than in its volume V as naively could be thought. Surely, a fundamental theory has to take this in consideration.
[ { "version": "v1", "created": "Sun, 23 Dec 2007 19:46:03 GMT" } ]
2008-04-05T00:00:00
[ [ "Lemos", "José P. S.", "" ] ]
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712.3946
David Callan
David Callan
A combinatorial interpretation for the identity Sum_{k=0}^{n} binom{n}{k} Sum_{j=0}^{k} binom{k}{j}^{3}= Sum_{k=0}^{n} binom{n}{k}^{2}binom{2k}{k}
4 pages
null
null
null
math.CO
null
The title identity appeared as Problem 75-4, proposed by P. Barrucand, in Siam Review in 1975. The published solution equated constant terms in a suitable polynomial identity. Here we give a combinatorial interpretation in terms of card deals.
[ { "version": "v1", "created": "Sun, 23 Dec 2007 20:12:32 GMT" } ]
2007-12-27T00:00:00
[ [ "Callan", "David", "" ] ]
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712.3947
Sadhan Adhikari K
Sadhan K. Adhikari and Boris A. Malomed
Gap solitons in superfluid boson-fermion mixtures
9 pages, 14 figures
Phys. Rev. A 76 (2007) 043626 (pp1-9)
10.1103/PhysRevA.76.043626
null
cond-mat.other nlin.PS
null
Using coupled equations for the bosonic and fermionic order parameters, we construct families of gap solitons (GSs) in a nearly one-dimensional Bose-Fermi mixture trapped in a periodic optical-lattice (OL) potential, the boson and fermion components being in the states of the BEC and BCS superfluid, respectively. Fundamental GSs are compact states trapped, essentially, in a single cell of the lattice. Full families of such solutions are constructed in the first two bandgaps of the OL-induced spectrum, by means of variational and numerical methods, which are found to be in good agreement. The families include both intra-gap and inter-gap solitons, with the chemical potentials of the boson and fermion components falling in the same or different bandgaps, respectively.Nonfundamental states, extended over several lattice cells, are constructed too. The GSs are stable against strong perturbations.
[ { "version": "v1", "created": "Wed, 26 Dec 2007 13:33:23 GMT" } ]
2009-11-13T00:00:00
[ [ "Adhikari", "Sadhan K.", "" ], [ "Malomed", "Boris A.", "" ] ]
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712.3948
Satadeep Bhattacharjee
Satadeep Bhattacharjee, Eric Bousquet and Philippe Ghosez
First-principle calculation of the dielectric and dynamical properties of orthorhombic CaMnO$_{3}$
Sumbitted to Phys. Rev. B
null
10.1088/0953-8984/20/25/255229
null
cond-mat.mtrl-sci
null
The structural, dielectric and dynamical properties of the low temperature antiferromagnetic orthorhombic phase of CaMnO$_3$ have been computed from first principles using a density functional theory approach within the local spin density approximation. The theoretical structural parameters are in good agreement with experiment. The full set of infrared and Raman zone-center phonons is reported and compared to experimental data. It is shown that coherently with the anomalous Born effective charges and the presence of low frequency polar modes, the static dielectric constant is very large and highly anisotropic.
[ { "version": "v1", "created": "Sun, 23 Dec 2007 20:15:49 GMT" }, { "version": "v2", "created": "Fri, 1 Feb 2008 10:47:23 GMT" } ]
2009-11-13T00:00:00
[ [ "Bhattacharjee", "Satadeep", "" ], [ "Bousquet", "Eric", "" ], [ "Ghosez", "Philippe", "" ] ]
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712.3949
Ettore Minguzzi
E. Minguzzi
Non-imprisonment conditions on spacetime
12 pages, 2 figures. v2: improved results on totally imprisoned curves, a figure changed, some misprints fixed
J.Math.Phys.49:062503,2008
10.1063/1.2937907
null
gr-qc
null
The non-imprisonment conditions on spacetimes are studied. It is proved that the non-partial imprisonment property implies the distinction property. Moreover, it is proved that feeble distinction, a property which stays between weak distinction and causality, implies non-total imprisonment. As a result the non-imprisonment conditions can be included in the causal ladder of spacetimes. Finally, totally imprisoned causal curves are studied in detail, and results concerning the existence and properties of minimal invariant sets are obtained.
[ { "version": "v1", "created": "Sun, 23 Dec 2007 20:29:56 GMT" }, { "version": "v2", "created": "Mon, 12 May 2008 10:59:32 GMT" } ]
2008-11-26T00:00:00
[ [ "Minguzzi", "E.", "" ] ]
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712.395
Huirong Yan
Huirong Yan and A. Lazarian
Cosmic ray transport in MHD turbulence
7 pages, 6 figures, accepted to ASTRONUM-2007, an invited talk at "2nd International Conference on Numerical Modeling of Space Plasma Flows", June 11-15 2007, Paris
null
null
null
astro-ph
null
Numerical simulations shed light onto earlier not trackable problem of magnetohydrodynamic (MHD) turbulence. They allowed to test the predictions of different models and choose the correct ones. Inevitably, this progress calls for revisions in the picture of cosmic ray (CR) transport. It also shed light on the problems with the present day numerical modeling of CR. In this paper we focus on the analytical way of describing CR propagation and scattering, which should be used in synergy with the numerical studies. In particular, we use recently established scaling laws for MHD modes to obtain the transport properties for CRs. We include nonlinear effects arising from large scale trapping, to remove the 90 degree divergence. We determine how the efficiency of the scattering and CR mean free path depend on the characteristics of ionized media, e.g. plasma $\beta$, Coulomb collisional mean free path. Implications for particle transport in interstellar medium and solar corona are discussed. We also examine the perpendicular transport of CRs. Perpendicular transport depends on the comparison of parallel mean free path and the injection scale of the turbulence, as well as the Alfv\'enic Mach number. Normal turbulence does not allow subdiffusion unless there are slab waves. The critical scale below which subdiffusion applies is provided. These results can be used to compare with the numerical calculations, provided that these calculations use the structure of magnetic field which is consistent with the numerical studies of MHD turbulence.
[ { "version": "v1", "created": "Sun, 23 Dec 2007 20:34:26 GMT" } ]
2007-12-27T00:00:00
[ [ "Yan", "Huirong", "" ], [ "Lazarian", "A.", "" ] ]
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712.3951
Eugen Ionascu Dr
Eugen J. Ionascu
A characterization of regular tetrahedra in Z^3
10 pages, 4 figures
null
null
null
math.NT math.CO
null
In this note we characterize all regular tetrahedra whose vertices in R^3 have integer coordinates. The main result is a consequence of the characterization of all equilateral triangles having integer coordinates contained in previous work. Then we use this characterization to point out some corollaries. The number of such tetrahedra whose vertices are in the finite set {0,1,2,...,n}^3, n in N, is related to the sequence A103158 in the Online Encyclopedia of Integer Sequences.
[ { "version": "v1", "created": "Sun, 23 Dec 2007 20:49:32 GMT" }, { "version": "v2", "created": "Mon, 31 Dec 2007 02:56:22 GMT" } ]
2007-12-31T00:00:00
[ [ "Ionascu", "Eugen J.", "" ] ]
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712.3952
Yuri Bakhtin
Yuri Bakhtin
Noisy heteroclinic networks
37 pages, 1 figure
null
null
null
math.PR math.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider a white noise perturbation of dynamics in the neighborhood of a heteroclinic network. We show that under the logarithmic time rescaling the diffusion converges in distributon in a special topology to a piecewise constant process that jumps between saddle points along the heteroclinic orbits of the network. We also obtain precise asymptotics for the exit measure for a domain containing the starting point of the diffusion.
[ { "version": "v1", "created": "Sun, 23 Dec 2007 20:53:02 GMT" }, { "version": "v2", "created": "Mon, 7 Dec 2009 03:42:10 GMT" }, { "version": "v3", "created": "Fri, 15 Jan 2010 18:58:57 GMT" } ]
2010-01-15T00:00:00
[ [ "Bakhtin", "Yuri", "" ] ]
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712.3953
Todor Popov
Oleg Ogievetsky, Todor Popov
On rime Ansatz
4 pages, talk given at the VII International Workshop "Supersymmetries and Quantum Symmetries", Dubna 2007
null
null
null
math.QA
null
The ice Ansatz on matrix solutions of the Yang-Baxter equation is weakened to a condition which we call rime. Generic rime solutions of the Yang-Baxter equation are described. We prove that the rime non-unitary (respectively, unitary) R-matrix is equivalent to the Cremmer-Gervais (respectively, boundary Cremmer-Gervais) solution. Generic rime classical r-matices satisfy the (non-)homogeneous associative classical Yang-Baxter equation.
[ { "version": "v1", "created": "Sun, 23 Dec 2007 21:29:16 GMT" } ]
2007-12-27T00:00:00
[ [ "Ogievetsky", "Oleg", "" ], [ "Popov", "Todor", "" ] ]
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712.3954
Jeffrey C. Lagarias
Jeffrey C. Lagarias
Cyclic systems of simultaneous congruences
25 pages; v2 fixes gcd condition in theorem 1.1 statement, v3 small changes
International Journal of Number Theory 6 (2010), No. 2, 219--245
null
null
math.NT math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper considers solutions (x_1, x_2, ..., x_n) to the cyclic system of n simultaneous congruences r (x_1x_2 ...x_n)/x_i = s (mod |x_i|), for fixed nonzero integers r,s with r>0 and gcd(r,s)=1. It shows this system has a finite number of solutions in positive integers x_i >1 having gcd(x_1x_2...x_n, s)=1, obtaining a sharp upper bound on the maximal size of the solutions in many cases. This bound grows doubly-exponentially in n. It shows there are infinitely many such solutions when the positivity restriction is dropped, when r=1, and not otherwise. The problem is reduced to the study of integer solutions of a three parameter family of Diophantine equations r(1/x_1 + 1/x_2 + ...+ 1/x_n)- s/(x_1x_2...x_n) = m, with parameters (r,s,m).
[ { "version": "v1", "created": "Sun, 23 Dec 2007 21:47:03 GMT" }, { "version": "v2", "created": "Fri, 25 Jul 2008 18:41:55 GMT" }, { "version": "v3", "created": "Thu, 2 Oct 2008 14:33:57 GMT" } ]
2010-12-09T00:00:00
[ [ "Lagarias", "Jeffrey C.", "" ] ]
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712.3955
Ofir Alon
O. E. Alon, A. I. Streltsov, and L. S. Cederbaum
Build-up of coherence between initially-independent subsystems: The case of Bose-Einstein condensates
11 pages, 3 figures
Phys. Lett. A 373, 301 (2009)
10.1016/j.physleta.2008.11.037
null
cond-mat.other quant-ph
null
When initially-independent subsystems are made to contact, {\it coherence} can develop due to interaction between them. We exemplify and demonstrate this paradigm through several scenarios of two initially-independent Bose-Einstein condensates which are allowed to collide. The build-up of coherence depends strongly on time, interaction strength and other parameters of each condensate. Implications are discussed.
[ { "version": "v1", "created": "Sun, 23 Dec 2007 22:59:55 GMT" } ]
2009-01-12T00:00:00
[ [ "Alon", "O. E.", "" ], [ "Streltsov", "A. I.", "" ], [ "Cederbaum", "L. S.", "" ] ]
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712.3956
Gwena\"el Joret
Samuel Fiorini, Gwena\"el Joret
On a Theorem of Sewell and Trotter
Referee comments incorporated
European Journal of Combinatorics, Vol. 30 (2), 2009, pp. 425-428
10.1016/j.ejc.2008.05.002
null
math.CO
null
Sewell and Trotter [J. Combin. Theory Ser. B, 1993] proved that every connected alpha-critical graph that is not isomorphic to K_1, K_2 or an odd cycle contains a totally odd K_4-subdivision. Their theorem implies an interesting min-max relation for stable sets in graphs without totally odd K_4-subdivisions. In this note, we give a simpler proof of Sewell and Trotter's theorem.
[ { "version": "v1", "created": "Sun, 23 Dec 2007 23:12:23 GMT" }, { "version": "v2", "created": "Wed, 20 Feb 2008 17:57:58 GMT" } ]
2008-12-15T00:00:00
[ [ "Fiorini", "Samuel", "" ], [ "Joret", "Gwenaël", "" ] ]
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712.3957
Donatas Narbutis
I. Sableviciute (1), V. Vansevicius (1), K. Kodaira (2), D. Narbutis (1), R. Stonkute (1), A. Bridzius (1) ((1) Inst. of Physics, Lithuania, (2) The Graduate Univ. for Advanced Studies, Japan)
A Survey of Compact Star Clusters in the S-W Field of the M31 Disk. Structural Parameters. II
12 pages, 11 figures, 1 table
BalticAstron.16:397-408,2007
null
null
astro-ph
null
The King and the EFF (Elson, Fall & Freeman 1987) analytical models are employed to determine the structural parameters of star clusters using an 1-D surface brightness profile fitting method. The structural parameters are derived and a catalogue is provided for 51 star cluster candidates from the survey of compact star clusters in the South-West field of the M31 disk performed by Kodaira et al. (2004).
[ { "version": "v1", "created": "Sun, 23 Dec 2007 23:14:52 GMT" } ]
2008-11-26T00:00:00
[ [ "Sableviciute", "I.", "" ], [ "Vansevicius", "V.", "" ], [ "Kodaira", "K.", "" ], [ "Narbutis", "D.", "" ], [ "Stonkute", "R.", "" ], [ "Bridzius", "A.", "" ] ]
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712.3958
Donatas Narbutis
D. Narbutis (1), V. Vansevicius (1), K. Kodaira (2), A. Bridzius (1), R. Stonkute (1) ((1) Inst. of Physics, Lithuania, (2) The Graduate Univ. for Advanced Studies, Japan)
Photometry of Star Clusters in the M31 Galaxy. Aperture Size Effects
12 pages, 7 figures
BalticAstron.16:409-420,2007
null
null
astro-ph
null
A study of aperture size effects on star cluster photometry in crowded fields is presented. Tests were performed on a sample of 285 star cluster candidates in the South-West field of the M31 galaxy disk, measured in the Local Group Galaxy Survey mosaic images (Massey et al. 2006). In the majority of cases the derived UBVRI photometry errors represent the accuracy of cluster colors well, however, for faint objects, residing in crowded environments, uncertainties of colors could be underestimated. Therefore, prior to deriving cluster parameters via a comparison of measured colors with SSP models, biases of colors, arising due to background crowding, must be taken into account. A comparison of our photometry data with Hubble Space Telescope observations of the clusters by Krienke and Hodge (2007) is provided.
[ { "version": "v1", "created": "Sun, 23 Dec 2007 23:23:06 GMT" } ]
2008-11-26T00:00:00
[ [ "Narbutis", "D.", "" ], [ "Vansevicius", "V.", "" ], [ "Kodaira", "K.", "" ], [ "Bridzius", "A.", "" ], [ "Stonkute", "R.", "" ] ]
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712.3959
Donatas Narbutis
D. Narbutis, A. Bridzius, R. Stonkute, V. Vansevicius (Inst. of Physics, Lithuania)
Accuracy of Star Cluster Parameters from Integrated UBVRI Photometry
9 pages, 8 figures
BalticAstron.16:421-429,2007
null
null
astro-ph
null
We study the capability of the UBVRI photometric system to quantify star clusters in terms of age, metallicity, and color excess by their integrated photometry. The well known age-metallicity-extinction degeneracy was analyzed for various parameter combinations, assuming different levels of photometric accuracy. We conclude that the UBVRI photometric system enables us to estimate star cluster parameters over a wide range, if the overall photometric accuracy is better than ~0.03 mag.
[ { "version": "v1", "created": "Sun, 23 Dec 2007 23:29:29 GMT" } ]
2008-11-26T00:00:00
[ [ "Narbutis", "D.", "", "Inst. of\n Physics, Lithuania" ], [ "Bridzius", "A.", "", "Inst. of\n Physics, Lithuania" ], [ "Stonkute", "R.", "", "Inst. of\n Physics, Lithuania" ], [ "Vansevicius", "V.", "", "Inst. of\n Physics, Lithuania" ] ]
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712.396
Yuri Serebrennikov
Yuri A. Serebrennikov
Sudden modulation theory of hole spin-3/2 relaxation
null
null
null
null
cond-mat.mes-hall cond-mat.mtrl-sci
null
We investigate the hole spin-3/2 relaxation process induced by nonadiabatic stochastic modulations of the instantaneous Luttinger Hamiltonian. The theory allows to consider fluctuations of both the direction and the magnitude of a hole wave vector in all regimes of momentum scattering: from collision-dominated to ballistic.
[ { "version": "v1", "created": "Mon, 24 Dec 2007 00:18:19 GMT" } ]
2007-12-27T00:00:00
[ [ "Serebrennikov", "Yuri A.", "" ] ]
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712.3961
Xin-Hui Zhang
Xin-Hui Zhang, Yi-Shi Duan, Yu-Xiao Liu and Li Zhao
Self-Dual Vortices in the Fractional Quantum Hall System
13 pages 10 figures. accepted by IJMPB
Int.J.Mod.Phys.B00:1-11,2009
10.1142/S0217979209052480
null
hep-th
null
Based on the $\phi$-mapping theory, we obtain an exact Bogomol'nyi self-dual equation with a topological term, which is ignored in traditional self-dual equation, in the fractional quantum Hall system. It is revealed that there exist self-dual vortices in the system. We investigate the inner topological structure of the self-dual vortices and show that the topological charges of the vortices are quantized by Hopf indices and Brouwer degrees. Furthermore, we study the branch processes in detail. The vortices are found generating or annihilating at the limit points and encountering, splitting or merging at the bifurcation points of the vector field $\vec\phi$.
[ { "version": "v1", "created": "Mon, 24 Dec 2007 01:57:17 GMT" } ]
2009-12-17T00:00:00
[ [ "Zhang", "Xin-Hui", "" ], [ "Duan", "Yi-Shi", "" ], [ "Liu", "Yu-Xiao", "" ], [ "Zhao", "Li", "" ] ]
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712.3962
Valeriy Tolstoy
V.N. Tolstoy (INP, Moscow State University)
Twisted Quantum Deformations of Lorentz and Poincar\'{e} algebras
18 pages. Invited talk at the VII International Workshop ''Lie Theory and its Applications in Physics'',18--24 June 2007, Varna, Bulgaria
null
null
null
math.QA hep-th math-ph math.MP math.RT
null
We discussed twisted quantum deformations of D=4 Lorentz and Poincare algebras. In the case of Poincare algebra it is shown that almost all classical r-matrices of S.Zakrzewski classification can be presented as a sum of subordinated r-matrices of Abelian and Jordanian types. Corresponding twists describing quantum deformations are obtained in explicit form. This work is an extended version of the paper \url{arXiv:0704.0081v1 [math.QA]}.
[ { "version": "v1", "created": "Tue, 25 Dec 2007 23:09:38 GMT" } ]
2008-01-05T00:00:00
[ [ "Tolstoy", "V. N.", "", "INP, Moscow State University" ] ]
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712.3963
Rom\'an Linares
Roman Linares, Hugo A. Morales-Tecotl, Omar Pedraza
Casimir force for a scalar field in warped brane worlds
22 pages, 2 figures
Phys.Rev.D77:066012,2008
10.1103/PhysRevD.77.066012
null
hep-ph
null
In looking for imprints of extra dimensions in brane world models one usually builts these so that they are compatible with known low energy physics and thus focuses on high energy effects. Nevertheless, just as submillimeter Newton's law tests probe the mode structure of gravity other low energy tests might apply to matter. As a model example, in this work we determine the 4D Casimir force corresponding to a scalar field subject to Dirichlet boundary conditions on two parallel planes lying within the single brane of a Randall-Sundrum scenario extended by one compact extra dimension. Using the Green's function method such a force picks the contribution of each field mode as if it acted individually but with a weight given by the square of the mode wave functions on the brane. In the low energy regime one regains the standard 4D Casimir force that is associated to a zero mode in the massless case or to a quasilocalized or resonant mode in the massive one whilst the effect of the extra dimensions gets encoded as an additional term.
[ { "version": "v1", "created": "Mon, 24 Dec 2007 02:27:20 GMT" } ]
2008-11-26T00:00:00
[ [ "Linares", "Roman", "" ], [ "Morales-Tecotl", "Hugo A.", "" ], [ "Pedraza", "Omar", "" ] ]
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712.3964
Chengqing Li
Chengqing Li, Shujun Li, Guanrong Chen and Wolfgang A. Halang
Cryptanalysis of an Image Encryption Scheme Based on a Compound Chaotic Sequence
11 pages, 2 figures
null
10.1016/j.imavis.2008.09.004
null
cs.CR cs.MM
null
Recently, an image encryption scheme based on a compound chaotic sequence was proposed. In this paper, the security of the scheme is studied and the following problems are found: (1) a differential chosen-plaintext attack can break the scheme with only three chosen plain-images; (2) there is a number of weak keys and some equivalent keys for encryption; (3) the scheme is not sensitive to the changes of plain-images; and (4) the compound chaotic sequence does not work as a good random number resource.
[ { "version": "v1", "created": "Mon, 24 Dec 2007 04:02:35 GMT" }, { "version": "v2", "created": "Mon, 31 Dec 2007 06:08:43 GMT" } ]
2009-12-21T00:00:00
[ [ "Li", "Chengqing", "" ], [ "Li", "Shujun", "" ], [ "Chen", "Guanrong", "" ], [ "Halang", "Wolfgang A.", "" ] ]
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712.3965
Jan Mandel
Jan Mandel, Jonathan D. Beezley, Janice L. Coen, Minjeong Kim
Data Assimilation for Wildland Fires: Ensemble Kalman filters in coupled atmosphere-surface models
Minor revision, except description of the model expanded. 29 pages, 9 figures, 53 references
IEEE Control Systems Magazine, 29, Issue 3, June 2009, 47-65
10.1109/MCS.2009.932224
UCD CCM Report 261
physics.ao-ph math.NA physics.comp-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Two wildland fire models are described, one based on reaction-diffusion-convection partial differential equations, and one based on semi-empirical fire spread by the level let method. The level set method model is coupled with the Weather Research and Forecasting (WRF) atmospheric model. The regularized and the morphing ensemble Kalman filter are used for data assimilation.
[ { "version": "v1", "created": "Mon, 24 Dec 2007 05:59:57 GMT" }, { "version": "v2", "created": "Thu, 15 Jan 2009 22:34:12 GMT" } ]
2010-03-01T00:00:00
[ [ "Mandel", "Jan", "" ], [ "Beezley", "Jonathan D.", "" ], [ "Coen", "Janice L.", "" ], [ "Kim", "Minjeong", "" ] ]
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712.3966
Ramesh Chandra
R. Chandra, P. K. Rath, P. K. Raina and J. G. Hirsch
Influence of the hexadecapole deformation on the two neutrino double-$\be ta $ decay
12 pages
null
null
null
nucl-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The two neutrino double beta $(\beta ^{-}\beta ^{-})_{2\nu}$ decay of $ ^{94,96}$Zr, $^{98,100}$Mo, $^{104}$Ru, $^{110}$Pd, $^{128,130}$Te and $^{150}$Nd nuclei for the $0^{+}\to 0^{+}$ transition is studied in the PHFB model in conjunction with the pairing plus quadrupole-quadrupole plus hexadecapole-hexadecapole effective two-body interaction and the effect of the latter is investigated on the calculation of nuclear transition matrix elements $M_{2\nu}$. The reliability of the intrinsic wave functions of parent and daughter nuclei involved in the $(\beta ^{-}\beta ^{-})_{2\nu}$ decay of above mentioned nuclei is established by obtaining an overall agreement between a number of theoretically calculated spectroscopic properties, namely the yrast spectra, reduced $B(E2$:$0^{+}\to 2^{+})$ transition probabilities, static quadrupole moments $Q(2^{+})$ and $g$-factors $g(2^{+})$ and the available experimental data. The effect of deformation on $M_{2\nu}$ is also investigated to inveterate its inverse relation with nuclear deformation.
[ { "version": "v1", "created": "Mon, 24 Dec 2007 06:44:45 GMT" }, { "version": "v2", "created": "Tue, 1 Apr 2008 07:32:07 GMT" }, { "version": "v3", "created": "Fri, 6 Jun 2008 12:46:17 GMT" } ]
2008-06-06T00:00:00
[ [ "Chandra", "R.", "" ], [ "Rath", "P. K.", "" ], [ "Raina", "P. K.", "" ], [ "Hirsch", "J. G.", "" ] ]
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712.3967
Shun-Ichiro Koh
Shun-ichiro Koh
Shear viscosity of liquid helium 4 above the lambda point
23 pages, 7 figures
null
null
null
cond-mat.supr-con cond-mat.stat-mech
null
In liquid helium 4, many features associated to Bose statistics have been masked by the strongly interacting nature of the liquid. As an example of these features, we examine the shear viscosity of liquid helium 4 above the lambda point. Applying the linear-response theory to Poiseuille's formula for the capillary flow, the reciprocal of the shear viscosity coefficient is considered as a transport coefficient. Using the Kramers-Kronig relation, we relate a superfluid flow in a capillary with that in a rotating bucket, and express the reciprocal of the shear viscosity coefficient in terms of the susceptibility of the system. A formula for the kinematic shear viscosity is obtained which describes the influence of Bose statistics. Using this formula, we study the gradual fall of the kinematic shear viscosity from 3.7K to the lambda point in liquid helium 4 at 1 atm.
[ { "version": "v1", "created": "Mon, 24 Dec 2007 06:52:56 GMT" } ]
2007-12-27T00:00:00
[ [ "Koh", "Shun-ichiro", "" ] ]
[ 0.0100806486, 0.0177941825, -0.0134097701, -0.0068273223, -0.0051977434, -0.0335127637, -0.1040131748, 0.0417918414, -0.0713633001, -0.029408209, -0.0120921144, 0.0613817647, -0.0693110228, 0.031996876, 0.0093576871, 0.0029618102, 0.0323466994, -0.0041774348, -0.0443805084, 0.0464094654, -0.0912797228, -0.0568107814, -0.0038888333, 0.0858225301, 0.0535924397, -0.0407657027, 0.0131882178, -0.068051666, 0.0357516147, -0.1429131627, 0.0855426714, -0.0451967567, 0.0739752874, -0.0637139007, -0.0235895347, 0.0201379769, 0.0497210957, 0.0154154059, -0.0729957893, -0.0717364401, -0.0364279337, 0.0232746974, -0.08675538, 0.0707103014, -0.008483137, 0.0200913344, 0.0311573092, -0.0359848253, 0.070570372, -0.0144359088, -0.0008286363, 0.0290350672, 0.0311339889, -0.0184821617, 0.0233679824, -0.0106870038, 0.089460656, 0.0382236764, 0.0687513053, -0.0572305657, -0.0413254127, -0.1319054961, -0.0537790097, -0.023437947, -0.09407828, 0.0176076107, -0.1182858348, -0.0067340368, 0.0337226577, -0.0266562905, 0.0199980494, 0.0598425567, 0.0411155224, 0.001305995, -0.098322764, -0.0204178337, -0.040695738, 0.0304809902, -0.0246739779, 0.0473189987, 0.0664191768, -0.0111942431, 0.0055213273, -0.0555047877, -0.0413487367, -0.0457564667, 0.0015727328, 0.023717802, -0.021024188, -0.0296647437, -0.0181556623, 0.040019419, -0.0706636608, -0.0262831505, -0.0334894434, -0.0785929114, 0.0872684494, -0.0643202513, -0.0631541908, 0.0395063497, -0.0822310448, 0.0414186977, -0.0386201367, 0.0031133988, 0.1996306628, 0.0623612627, -0.028148856, -0.046082966, -0.0256301519, -0.0002541662, 0.0649266094, 0.0096608652, -0.0748148561, 0.0115498938, -0.0812981874, -0.0626411214, -0.0316470563, -0.0289651044, -0.1796676069, 0.0526129417, -0.0184588395, -0.0273326095, 0.1069050208, -0.0587231331, 0.0366611443, -0.0501875244, 0.0896005854, -0.0603089854, -0.0240909439, -0.0296647437, 0.0648799688, -0.0752346441, -0.070570372, -0.098322764, 0.0607754104, -0.0149256578, 0.0785462707, 0.0148323718, 0.1390884668, -0.0148207117, 0.0177592002, 0.0850296021, 0.133398056, -0.0348887257, 0.0944980681, 0.1264949441, -0.0139111793, -0.0522864424, 0.0097774714, 0.0015479539, 0.0162782948, 0.0213740077, 0.0019240105, -0.0210008658, -0.0039646276, 0.0039238152, 0.067865096, 0.0847497508, -0.0014699731, -0.0529394411, -0.082324326, -0.0159284752, -0.0539655797, -0.0305276327, -0.0426780507, -0.0164998472, 0.0105004329, -0.0210708305, -0.0755611435, -0.1917946935, 0.0352618657, -0.030271098, -0.059189558, -0.0864288807, 0.1569992602, 0.0745816454, 0.057743635, -0.0934252888, -0.0021324449, 0.1345174909, -0.0296647437, 0.0188553035, 0.0235428922, -0.0127217909, -0.0790593401, 0.1566261202, 0.0557846427, 0.1533611268, 0.057557065, 0.0154387271, -0.047435604, 0.1481371522, 0.0815314054, 0.0236594994, 0.0289884247, -0.0349353664, -0.0114507778, 0.0698707327, 0.0090486798, 0.0635739714, 0.0704304427, -0.0395063497, 0.0524263717, -0.0854493901, -0.0383169614, 0.0537323654, 0.0927722901, -0.0083781909, -0.1344241947, 0.0000549327, -0.0027679515, 0.0904867947, 0.0648799688, 0.0277523939, -0.0610552654, -0.0068389829, -0.0642269701, 0.0520065874, 0.0309240967, 0.0987891927, -0.0951510668, 0.0375706777, -0.0151938526, 0.0915129334, 0.0127101298, 0.0457564667, 0.1492565721, -0.0625944734, -0.0456165411, 0.0161267072, 0.0307142045, 0.0576969944, -0.0624545477, 0.0693576634, -0.0321368054, -0.1105431467, -0.0430278704, 0.0500475951, -0.0474122837, -0.1441258788, -0.0729025081, 0.031623736, -0.0131182531, 0.053032726, 0.0076144175, -0.0085880831, -0.0293615665, -0.0703371614, 0.06478668, -0.0369876437, -0.0732290074, -0.0352618657, 0.0076260781, -0.043284405, -0.0431444794, 0.0200680122 ]
712.3968
Sergey Goloskokov
S.V.Goloskokov
Electroproduction of Light Vector Mesons
4 pages, 3 figures, report at XII International Workshop on High Energy Spin Physics, Dubna, September 3 - 7, 2007, Russia
null
null
null
hep-ph
null
An analysis of light vector meson photoproduction at small Bjorken $x \leq 0.2$ is done on the basis of the generalized parton distributions (GPDs). Our results on the cross section and spin density matrix elements (SDME) are in good agreement with experiments.
[ { "version": "v1", "created": "Mon, 24 Dec 2007 06:54:50 GMT" } ]
2007-12-27T00:00:00
[ [ "Goloskokov", "S. V.", "" ] ]
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712.3969
Gajendra Pandey
N. Kameswara Rao (Indian Institute of Astrophysics, Bangalore)
Some Observational Aspects of R Coronae Borealis Stars
To appear in proceedings of "Hydrogen-Deficient Stars" conference, held in Tuebingen, Germany, Sept. 17-21, 2007. 10 pages
null
null
null
astro-ph
null
Some of the observational aspects related to the evolutionary status and dust production in R Cor Bor stars are discussed. Recent work regarding the surface abundances, stellar winds and evidence for dust production in these high luminosty hydrogen deficient stars are also reviewed. Possibility of the stellar winds being maintained by surface magnetic fields is also considered.
[ { "version": "v1", "created": "Mon, 24 Dec 2007 07:07:30 GMT" } ]
2007-12-27T00:00:00
[ [ "Rao", "N. Kameswara", "", "Indian Institute of Astrophysics, Bangalore" ] ]
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712.397
Olivier Buisson
A. Fay (NEEL), E. Hoskinson (NEEL), F. Lecocq (NEEL), L. P. L\'evy (NEEL), F. W. J. Hekking (PMMC), W. Guichard (NEEL), O. Buisson (NEEL)
Strong tunable coupling between a superconducting charge and phase qubit
5 pages
Physical Review Letters 100 (2008) 187003
10.1103/PhysRevLett.100.187003
null
cond-mat.mes-hall
null
We have realized a tunable coupling over a large frequency range between an asymmetric Cooper pair transistor (charge qubit) and a dc SQUID (phase qubit). Our circuit enables the independent manipulation of the quantum states of each qubit as well as their entanglement. The measurements of the charge qubit's quantum states is performed by resonant read-out via the measurement of the quantum states of the SQUID. The measured coupling strength is in agreement with an analytic theory including a capacitive and a tunable Josephson coupling between the two qubits.
[ { "version": "v1", "created": "Mon, 24 Dec 2007 07:13:42 GMT" } ]
2008-09-10T00:00:00
[ [ "Fay", "A.", "", "NEEL" ], [ "Hoskinson", "E.", "", "NEEL" ], [ "Lecocq", "F.", "", "NEEL" ], [ "Lévy", "L. P.", "", "NEEL" ], [ "Hekking", "F. W. J.", "", "PMMC" ], [ "Guichard", "W.", "", "NEEL" ], [ "Buisson", "O.", "", "NEEL" ] ]
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712.3971
Gajendra Pandey
Gajendra Pandey (1), David L. Lambert (2), N. Kameswara Rao (1) ((1) Indian Institute of Astrophysics, Bangalore, (2) The W.J. McDonald Observatory, University of Texas at Austin, USA)
Fluorine in R Coronae Borealis and Extreme Helium Stars
To appear in proceedings of "Hydrogen-Deficient Stars" conference, held in Tuebingen, Germany, Sept. 17-21, 2007. 4 pages
null
null
null
astro-ph
null
Neutral fluorine lines are identified in the optical spectra of several R Coronae Borealis stars (RCBs) at maximum light. These lines provide the first measurement of the fluorine abundance in these stars. Fluorine is enriched in some RCBs by factors of 800 to 8000 relative to its likely initial abundance. The overabundances of fluorine are evidence for the synthesis of fluorine. These results are discussed in the light of the scenario that RCBs are formed by accretion of an He white dwarf by a C-O white dwarf. Sakurai's object (V4334 Sgr), a final He-shell flash product, shows no detectable neutral fluorine lines.
[ { "version": "v1", "created": "Mon, 24 Dec 2007 07:20:14 GMT" } ]
2007-12-27T00:00:00
[ [ "Pandey", "Gajendra", "" ], [ "Lambert", "David L.", "" ], [ "Rao", "N. Kameswara", "" ] ]
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712.3972
Jean Dolbeault
Jean Dolbeault (CEREMADE), Maria J. Esteban (CEREMADE), Michael Loss
Characterization of the critical magnetic field in the Dirac-Coulomb equation
null
null
null
null
math.AP
null
We consider a relativistic hydrogenic atom in a strong magnetic field. The ground state level depends on the strength of the magnetic field and reaches the lower end of the spectral gap of the Dirac-Coulomb operator for a certain critical value, the critical magnetic field. We also define a critical magnetic field in a Landau level ansatz. In both cases, when the charge Z of the nucleus is not too small, these critical magnetic fields are huge when measured in Tesla, but not so big when the equation is written in dimensionless form. When computed in the Landau level ansatz, orders of magnitude of the critical field are correct, as well as the dependence in Z. The computed value is however significantly too big for a large Z, and the wave function is not well approximated. Hence, accurate numerical computations involving the Dirac equation cannot systematically rely on the Landau level ansatz. Our approach is based on a scaling property. The critical magnetic field is characterized in terms of an equivalent eigenvalue problem. This is our main analytical result, and also the starting point of our numerical scheme.
[ { "version": "v1", "created": "Mon, 24 Dec 2007 07:24:35 GMT" } ]
2007-12-27T00:00:00
[ [ "Dolbeault", "Jean", "", "CEREMADE" ], [ "Esteban", "Maria J.", "", "CEREMADE" ], [ "Loss", "Michael", "" ] ]
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712.3973
Marc Schoenauer
Pierre Collet (LIL), Marc Schoenauer (INRIA Rocquencourt)
GUIDE: Unifying Evolutionary Engines through a Graphical User Interface
null
Dans Evolution Artificielle 2936 (2003) 203-215
null
null
cs.NE
null
Many kinds of Evolutionary Algorithms (EAs) have been described in the literature since the last 30 years. However, though most of them share a common structure, no existing software package allows the user to actually shift from one model to another by simply changing a few parameters, e.g. in a single window of a Graphical User Interface. This paper presents GUIDE, a Graphical User Interface for DREAM Experiments that, among other user-friendly features, unifies all kinds of EAs into a single panel, as far as evolution parameters are concerned. Such a window can be used either to ask for one of the well known ready-to-use algorithms, or to very easily explore new combinations that have not yet been studied. Another advantage of grouping all necessary elements to describe virtually all kinds of EAs is that it creates a fantastic pedagogic tool to teach EAs to students and newcomers to the field.
[ { "version": "v1", "created": "Mon, 24 Dec 2007 07:31:58 GMT" } ]
2011-11-10T00:00:00
[ [ "Collet", "Pierre", "", "LIL" ], [ "Schoenauer", "Marc", "", "INRIA Rocquencourt" ] ]
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712.3974
Farook Rahaman
R.Mukherjee and F.Rahaman
Static global monopoles in higher dimensional space time
11 pages, 5 figures, submitted to Acta Physica Polonica B after minor revision
ActaPhys.Polon.B39:1489-1500,2008
null
null
gr-qc
null
We present an exact solution around global monopole resulting from the breaking of a global S0(3) symmetry in a five dimensional space time. We have shown that the global monopole in higher dimensional space time exerts gravitational force which is attractive in nature. It is also shown that the space around global monopole has a deficit solid angle. Finally, we study monopole in higher dimensional space time within the framework of Lyra geometry.
[ { "version": "v1", "created": "Mon, 24 Dec 2007 08:18:11 GMT" } ]
2008-11-26T00:00:00
[ [ "Mukherjee", "R.", "" ], [ "Rahaman", "F.", "" ] ]
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712.3975
Sergei Sinegovsky
S.I.Sinegovsky, A.Misaki, K.S.Lokhtin and N.Takahashi
Effect of muon-nuclear inelastic scattering on high-energy atmospheric muon spectrum at large depth underwater
4 pages, 3 eps figures. Presented at 30th International Cosmic Ray Conference (ICRC 2007), Merida, Yucatan, Mexico, 3-11 Jul 2007
null
null
null
astro-ph hep-ph
null
The energy spectra of hadron cascade showers produced by the cosmic ray muons travelling through water as well as the muon energy spectra underwater at the depth up to 4 km are calculated with two models of muon inelastic scattering on nuclei, the recent hybrid model (two-component, 2C) and the well-known generalized ector-meson-dominance model for the comparison. The 2C model involves photonuclear interactions at low and moderate virtualities as well as the hard scattering including the weak neutral current processes. For the muon scattering off nuclei substantial uclear effects, shadowing, nuclear binding and Fermi motion of nucleons are taken into account. It is shown that deep nderwater muon energy spectrum calculated with the 2C model are noticeably distorted at energies above 100 TeV as compared to that obtained with the GVMD model.
[ { "version": "v1", "created": "Mon, 24 Dec 2007 08:12:52 GMT" } ]
2011-09-16T00:00:00
[ [ "Sinegovsky", "S. I.", "" ], [ "Misaki", "A.", "" ], [ "Lokhtin", "K. S.", "" ], [ "Takahashi", "N.", "" ] ]
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712.3976
Dai Aoki
E. Hassinger, J. Derr, J. Levallois, D. Aoki, K. Behnia, F. Bourdarot, G. Knebel, C. Proust, J. Flouquet
Skutterudite Results Shed Light on Heavy Fermion Physics
8 pages, 10 figures, proceedings of International Conference on "New Quantum Phenomena in Skutterudite and Related Systems"
null
10.1143/JPSJS.77SA.172
null
cond-mat.str-el cond-mat.supr-con
null
Only few selected examples among the great diversity of anomalous rare earth skutterudite are reviewed. Focus is first given on PrFe4P12 in comparison with URu2Si2. For PrFe4P12, great progress has been made on determining the nature of the order parameter (OP). A non magnetic order parameter with a multipolar component emerges here while for URu2Si2 the nature of the so-called hidden order remains mysterious. The two systems have several similarities in their temperature--pressure (T, P) and magnetic field--temperature (H, T) phase diagrams, in their spin dynamics, in their nesting character and in their high sensitivity to impurities. Advances on one side must stimulate new views on the other. Besides general considerations on the choice of the OP, a simple basic problem is the treatment of the Kondo coupling in a system with low charge carrier number for the cases of uncompensated and compensated semi-metal. An interesting problem is also the possible decoupling between exciton modes and itinerant carriers.
[ { "version": "v1", "created": "Mon, 24 Dec 2007 08:30:31 GMT" } ]
2015-05-13T00:00:00
[ [ "Hassinger", "E.", "" ], [ "Derr", "J.", "" ], [ "Levallois", "J.", "" ], [ "Aoki", "D.", "" ], [ "Behnia", "K.", "" ], [ "Bourdarot", "F.", "" ], [ "Knebel", "G.", "" ], [ "Proust", "C.", "" ], [ "Flouquet", "J.", "" ] ]
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712.3977
Jan Mandel
Jan Mandel, Bed\v{r}ich Soused\'ik, Clark R. Dohrmann
Multispace and Multilevel BDDC
26 pages, 3 figures, 2 tables, 20 references. Formal changes only
Computing 83(2-3), 55-85, 2008
10.1007/s00607-008-0014-7
null
math.NA
null
BDDC method is the most advanced method from the Balancing family of iterative substructuring methods for the solution of large systems of linear algebraic equations arising from discretization of elliptic boundary value problems. In the case of many substructures, solving the coarse problem exactly becomes a bottleneck. Since the coarse problem in BDDC has the same structure as the original problem, it is straightforward to apply the BDDC method recursively to solve the coarse problem only approximately. In this paper, we formulate a new family of abstract Multispace BDDC methods and give condition number bounds from the abstract additive Schwarz preconditioning theory. The Multilevel BDDC is then treated as a special case of the Multispace BDDC and abstract multilevel condition number bounds are given. The abstract bounds yield polylogarithmic condition number bounds for an arbitrary fixed number of levels and scalar elliptic problems discretized by finite elements in two and three spatial dimensions. Numerical experiments confirm the theory.
[ { "version": "v1", "created": "Mon, 24 Dec 2007 08:48:01 GMT" }, { "version": "v2", "created": "Mon, 21 Jan 2008 07:26:16 GMT" } ]
2014-07-17T00:00:00
[ [ "Mandel", "Jan", "" ], [ "Sousedík", "Bedřich", "" ], [ "Dohrmann", "Clark R.", "" ] ]
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712.3978
Miodrag Krmar
Vladan Pankovic, Simo Ciganovic, Jovan Ivanovic, Rade Glavatovic, Petar Grujic
A Simple Theoretical Prediction of the Data Corresponding to Observationally Estimated Value of Cosmological Constant
4 pages, no figures
null
null
Ph-A-NS-8/07
astro-ph
null
In this work a satisfactory, simple theoretical prediction of the data corresponding to observationally (by fine tuning condition) estimated value of the cosmological constant is given. It is supposed (in conceptually analogy with holographic principle) that cosmological constant, like classical surface tension coefficient by a liquid drop, does not correspond to a volume (bulk) vacuum mass (energy) density distribution but that it corresponds to a surface vacuum mass (energy) density distribution. Then form of given surface mass distribution and fine tuning condition imply observed growing (for $\sim$ 61 magnitude order) of the scale factor (from initial, corresponding to Planck length, to recent, at the beginning of the cosmic acceleration, corresponding to 10 Glyr length).
[ { "version": "v1", "created": "Mon, 24 Dec 2007 08:57:58 GMT" } ]
2007-12-27T00:00:00
[ [ "Pankovic", "Vladan", "" ], [ "Ciganovic", "Simo", "" ], [ "Ivanovic", "Jovan", "" ], [ "Glavatovic", "Rade", "" ], [ "Grujic", "Petar", "" ] ]
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