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711.3608
Gerardo Adesso
Gerardo Adesso and Giulio Chiribella
Quantum Benchmark for Teleportation and Storage of Squeezed States
4 pages, 1 figure; final published version
Phys. Rev. Lett. 100, 170503 (2008)
10.1103/PhysRevLett.100.170503
null
quant-ph
null
We provide a quantum benchmark for teleportation and storage of single-mode squeezed states with zero displacement and a completely unknown degree of squeezing along a given direction. For pure squeezed input states, a fidelity higher than 81.5% has to be attained in order to outperform any classical strategy based on an estimation of the unknown squeezing and repreparation of squeezed states. For squeezed thermal input states, we derive an upper and a lower bound on the classical average fidelity which tighten for moderate degree of mixedness. These results enable a critical discussion of recent experiments with squeezed light.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 16:02:50 GMT" }, { "version": "v2", "created": "Tue, 29 Apr 2008 15:55:53 GMT" } ]
2008-04-29T00:00:00
[ [ "Adesso", "Gerardo", "" ], [ "Chiribella", "Giulio", "" ] ]
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711.3609
Julius Borcea
Julius Borcea, Boris Shapiro, Michael Shapiro
On eigenvalues of rectangular matrices
10 pages, no figures, LaTeX2e
null
null
null
math.AG math.RT math.SP
null
Given a $(k+1)$-tuple $A, B_1,...,B_k$ of $(m\times n)$-matrices with $m\le n$ we call the set of all $k$-tuples of complex numbers $\{\la_1,...,\la_k\}$ such that the linear combination $A+\la_1B_1+\la_2B_2+...+\la_kB_k$ has rank smaller than $m$ the {\it eigenvalue locus} of the latter pencil. Motivated primarily by applications to multi-parameter generalizations of the Heine-Stieltjes spectral problem, see \cite{He} and \cite{Vol}, we study a number of properties of the eigenvalue locus in the most important case $k=n-m+1$.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 16:06:15 GMT" } ]
2007-11-26T00:00:00
[ [ "Borcea", "Julius", "" ], [ "Shapiro", "Boris", "" ], [ "Shapiro", "Michael", "" ] ]
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711.361
David Gerard-Varet
David Gerard-Varet (DMA)
The Navier wall law at a boundary with random roughness
null
null
10.1007/s00220-008-0597-z
null
math.AP physics.class-ph
null
We consider the Navier-Stokes equation in a domain with irregular boundaries. The irregularity is modeled by a spatially homogeneous random process, with typical size $\eps \ll 1$. In a parent paper, we derived a homogenized boundary condition of Navier type as $\eps \to 0$. We show here that for a large class of boundaries, this Navier condition provides a $O(\eps^{3/2} |\ln \eps|^{1/2})$ approximation in $L^2$, instead of $O(\eps^{3/2})$ for periodic irregularities. Our result relies on the study of an auxiliary boundary layer system. Decay properties of this boundary layer are deduced from a central limit theorem for dependent variables.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 16:08:27 GMT" } ]
2009-11-13T00:00:00
[ [ "Gerard-Varet", "David", "", "DMA" ] ]
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711.3611
Piotr Trocha
Piotr Trocha and J\'ozef Barna\'s
Dicke-like effect in spin-polarized transport through coupled quantum dots
6 pages, 5 figures
J. Phys.: Condens. Matter 20 (2008) 125220
10.1088/0953-8984/20/12/125220
null
cond-mat.mes-hall
null
Spin-dependent electronic transport through a quantum dot side-coupled to two quantum dots and attached to ferromagnetic leads with collinear (parallel and antiparallel) magnetizations is analyzed theoretically. The intra-dot Coulomb correlations are taken into account, whereas the inter-dot ones are neglected. Transport characteristics, i.e. conductance and tunnel magnetoresistance associated with the magnetization rotation from parallel to antiparallel configurations, are calculated by the noneqiulibrium Green function technique. The Green functions are derived by the equation of motion method in the Hartree-Fock approximation. The conductance spectra are shown to reveal features similar to the Dicke resonance in atomic physics.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 16:11:11 GMT" }, { "version": "v2", "created": "Wed, 5 Mar 2008 15:21:42 GMT" } ]
2008-03-05T00:00:00
[ [ "Trocha", "Piotr", "" ], [ "Barnaś", "Józef", "" ] ]
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711.3612
Igor Antokhin
I.I.Antokhin, G.Rauw, J.-M.Vreux, K.A. van der Hucht, J.C.Brown
XMM-Newton X-ray study of early type stars in the Carina OB1 association
20 pages, 16 figures
null
10.1051/0004-6361:20065711
null
astro-ph
null
X-ray properties of the stellar population in the Carina OB1 association are examined with special emphasis on early-type stars. Their spectral characteristics provide some clues to understanding the nature of X-ray formation mechanisms in the winds of single and binary early-type stars. A timing and spectral analysis of five observations with XMM-Newton is performed using various statistical tests and thermal spectral models. 235 point sources have been detected within the field of view. Several of these sources are probably pre-main sequence stars with characteristic short-term variability. Seven sources are possible background AGNs. Spectral analysis of twenty three sources of type OB and WR 25 was performed. We derived spectral parameters of the sources and their fluxes in three energy bands. Estimating the interstellar absorption for every source and the distance to the nebula, we derived X-ray luminosities of these stars and compared them to their bolometric luminosities. We discuss possible reasons for the fact that, on average, the observed X-ray properties of binary and single early type stars are not very different, and give several possible explanations.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 16:18:15 GMT" } ]
2009-11-13T00:00:00
[ [ "Antokhin", "I. I.", "" ], [ "Rauw", "G.", "" ], [ "Vreux", "J. -M.", "" ], [ "van der Hucht", "K. A.", "" ], [ "Brown", "J. C.", "" ] ]
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711.3613
Achim Schwenk
L. Tolos, B. Friman, A. Schwenk
Neutron matter at finite temperature
15 pages, 6 figures
Nucl.Phys.A806:105-116,2008
10.1016/j.nuclphysa.2008.02.309
null
nucl-th astro-ph cond-mat.other nucl-ex
null
We calculate the neutron matter equation of state at finite temperature based on low-momentum two- and three-nucleon interactions. The free energy is obtained from a loop expansion around the Hartree-Fock energy, including contributions from normal and anomalous diagrams. We focus on densities below saturation density with temperatures T <= 10 MeV and compare our results to the model-independent virial equation of state and to variational calculations. Good agreement with the virial equation of state is found at low density. We provide simple estimates for the theoretical error, important for extrapolations to astrophysical conditions.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 16:28:36 GMT" } ]
2008-11-26T00:00:00
[ [ "Tolos", "L.", "" ], [ "Friman", "B.", "" ], [ "Schwenk", "A.", "" ] ]
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711.3614
Boris I. Belevtsev
D. G. Naugle, B. I. Belevtsev, K. D. D. Rathnayaka, S.-I. Lee, S. M. Yeo
Torque magnetometry studies of new low temperature metamagnetic states in ErNi_{2}B_{2}C
3 pages (4 figs. incl.) reported at 52th Magnetism and Magnetic Materials Conference, Tampa, Florida, USA, November 2007
J. Appl. Phys. 103 (2008) 07B718
10.1063/1.2829034
null
cond-mat.str-el
null
The metamagnetic transitions in single-crystal ErNi$_2$B$_2$C have been studied at 1.9 K with a Quantum Design torque magnetometer. The critical fields of the transitions depend crucially on the angle between applied field and the easy axis [100]. Torque measurements have been made while changing angular direction of the magnetic field (parallel to basal tetragonal $ab$-planes) in a wide angular range (more than two quadrants). Sequences of metamagnetic transitions with increasing field are found to be different for the magnetic field along (or close enough to) the easy [100] axis from that near the hard [110] axis. The study have revealed new metamagnetic states in ErNi$_{2}$B$_2$C which were not apparent in previous longitudinal-magnetization and neutron studies.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 16:34:38 GMT" } ]
2008-04-18T00:00:00
[ [ "Naugle", "D. G.", "" ], [ "Belevtsev", "B. I.", "" ], [ "Rathnayaka", "K. D. D.", "" ], [ "Lee", "S. -I.", "" ], [ "Yeo", "S. M.", "" ] ]
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711.3615
Dietrich Stauffer
M.A. Sumour, A.H. El-Astal, M.A. Radwan, M.M. Shabat
Urban segregation with cheap and expensive residences
11 pages, large figures, shortened version will be prepared for IJMPC
null
10.1142/S0129183108012406
null
physics.soc-ph
null
In this paper we study urban segregation of two different communities A and B, poor and rich, distributed randomly on finite samples, to check cheap and expensive residences. For this purpose we avoid the complications of the Schelling model which are not necessary and instead we use the Ising model on 500 x 500 square lattice, which give similar results, with random magnetic field at lower and higher temperatures (kT/J = 2.0, 99.0) in finite times equal to 40, 400, 4000 and 40,000. This random-field Ising magnet is a suitable model, where each site of the square lattice carries a magnetic field h which is randomly up (expensive) or down (cheap). The resulting addition to the energy prefers up spins on the expensive and down spins on the cheap sites. Our simulations were carried out using a 50-lines FORTRAN program. We present at a lower temperature (2.0) a time series of pictures, separating growing from non-growing domains. A small random field (h = +- 0.1) allows for large domains, while a large random field (h = +- 0.9) allows only small clusters. At higher temperature (99.0) we could not obtain growing domains.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 16:41:16 GMT" } ]
2009-11-13T00:00:00
[ [ "Sumour", "M. A.", "" ], [ "El-Astal", "A. H.", "" ], [ "Radwan", "M. A.", "" ], [ "Shabat", "M. M.", "" ] ]
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711.3616
Axel Brandenburg
A. Brandenburg, P. J. K\"apyl\"a, D. Mitra, D. Moss, R. Tavakol
The helicity constraint in spherical shell dynamos
4 pages, 5 fig, proceedings of 5th Potsdam Thinkshop on Meridional flow, differential rotation, solar and stellar activity, to be published in Astron. Nachr
Astron. Nachr. 328, 1118-1121 (2007)
10.1002/asna.200710881
NORDITA-2007-36
astro-ph
null
The motivation for considering distributed large scale dynamos in the solar context is reviewed in connection with the magnetic helicity constraint. Preliminary accounts of 3-dimensional direct numerical simulations (in spherical shell segments) and simulations of 2-dimensional mean field models (in spherical shells) are presented. Interesting similarities as well as some differences are noted.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 16:43:15 GMT" } ]
2011-11-10T00:00:00
[ [ "Brandenburg", "A.", "" ], [ "Käpylä", "P. J.", "" ], [ "Mitra", "D.", "" ], [ "Moss", "D.", "" ], [ "Tavakol", "R.", "" ] ]
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711.3617
Karthik Bharath
Karthik Bharath, Swarnamala Sirsi, A R Usha Devi
Geometrical Domain of Spin 1/2 Probability Mass Function
Submitted to Foundations of Physics
null
null
null
quant-ph
null
The quantum analogue of the classical characteristic function for a spin 1/2 assembly is considered and the probability mass function of the random vector associated with the assembly is derived. It is seen that the positive regions of Wigner and Margenau-Hill quasi distributions for the three components of spin, correspond to a trivariate probability mass function. We identify the domain of these positive regions as an Octahedron inscribed in the Bloch sphere with its vertices on the surface of the sphere. It is in this domain that a quantum characteristic function characterizing the quasi distribution, admits a probability mass function in IR^3 . It is also observed that the classical variates X1, X2, X3 corresponding to the 3 spin operators \sigma_1,\sigma_2,\sigma_3 in the domain, are independent iff the Bloch vector lies on any one of the axes.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 16:50:44 GMT" } ]
2007-11-26T00:00:00
[ [ "Bharath", "Karthik", "" ], [ "Sirsi", "Swarnamala", "" ], [ "Devi", "A R Usha", "" ] ]
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711.3618
Alek Dediu
M. Cavallini, F. Biscarini, P. Nozar, V. Dediu
Complex surface spin polarization of the La0.7Sr0.3MnO3 films
15 pages, 5 figures
null
null
null
cond-mat.mtrl-sci
null
The surface spin polarization in the epitaxial films of a prototype manganite, La0.7Sr0.3MnO3, has been investigated by Scanning Tunneling Spectroscopy with ferromagnetic SP tips at room temperature. The manganite surface splits into ferromagnetic (FM) and paramagnetic(PM) regions characterized by metallic and insulating like behavior respectively. Spin polarized spectroscopy with Ni tips has been performed separately for the two phases, and the results compared with standard W and Pt tips. While PM exhibits featureless tunneling characteristics, the FM regions exhibit at room temperature strongly nonlinear behavior with a band-gap like behavior. The spin resolved density of states of the FM regions of the manganite has been extracted by the deconvolution of the spectroscopic curves. It indicates very high spin polarization (nearly halfmetallic behavior) with the spin down band separated from Fermi level by 0.4 eV. This value corresponds exactly to the gap value measured for the whole surface of this manganite at low temperatures. Thus the surface of the La0.7Sr0.3MnO3 films maintain even at room temperature nano- and micrometric islands of very high spin polarization, while the total polarization is given by the coverage of the surface by FM regions. This result is extremely important for spintronic applications of this material and indicates possible roots for the realization of manganite nanosized devices with extremely high spin polarization.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 16:52:43 GMT" } ]
2007-11-26T00:00:00
[ [ "Cavallini", "M.", "" ], [ "Biscarini", "F.", "" ], [ "Nozar", "P.", "" ], [ "Dediu", "V.", "" ] ]
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711.3619
Anthony Clark Mr.
A. C. Clark, J. D. Maynard, and M. H. W. Chan
Thermal History of Solid 4He Under Oscillation
7 pages, 6 figures
null
10.1103/PhysRevB.77.184513
null
cond-mat.stat-mech cond-mat.other
null
We have studied the thermal history of the resonant frequency of a torsional oscillator containing solid 4He. We find that the magnitude of the frequency shift that occurs below 100 mK is multivalued in the low temperature limit, with the exact value depending on how the state is prepared. This result can be qualitatively explained in terms of the motion and pinning of quantized vortices within the sample. Several aspects of the data are also consistent with the response of dislocation lines to oscillating stress fields imposed on the solid.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 17:03:10 GMT" }, { "version": "v2", "created": "Sun, 13 Jan 2008 16:59:51 GMT" } ]
2009-11-13T00:00:00
[ [ "Clark", "A. C.", "" ], [ "Maynard", "J. D.", "" ], [ "Chan", "M. H. W.", "" ] ]
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711.362
Trueman MacHenry
Trueman MacHenry and Kieh Wong
A Representation of Multiplicative Arithmetic Functions by Symmetric Polynomials
null
null
null
null
math.NT
null
We give a representation of the classical theory of multiplicative arithmetic functions (MF)in the ring of symmetric polynomials. The basis of the ring of symmetric polynomials that we use is the isobaric basis, a basis especially sensitive to the combinatorics of partitions of the integers. The representing elements are recursive sequences of Schur polynomials evaluated at subrings of the complex numbers. The multiplicative arithmetic functions are units in the Dirichlet ring of arithmetic functions, and their properties can be described locally, that is, at each prime number $p$. Our representation is, hence, a local representation. One such representing sequence is the sequence of generalized Fibonacci polynomials. In general the sequences consist of Schur-hook polynomials. This representation enables us to clarify and generalize classical results, e.g., the Busche-Ramanujan identity, as well as to give a richer structural description of the convolution group of multiplicative functions. It is a consequence of the representation that the MF's can be defined in a natural way on the negative powers of the prime $p$.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 17:06:52 GMT" } ]
2007-11-26T00:00:00
[ [ "MacHenry", "Trueman", "" ], [ "Wong", "Kieh", "" ] ]
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711.3621
Aernout Coert Daniel van Enter
A.C.D. van Enter and W.M.Ruszel
Gibbsianness versus Non-Gibbsianness of time-evolved planar rotor models
latexpdf, with 2 pdf figures
null
null
null
math-ph math.MP math.PR
null
We study the Gibbsian character of time-evolved planar rotor systems on Z^d, d at least 2, in the transient regime, evolving with stochastic dynamics and starting with an initial Gibbs measure. We model the system by interacting Brownian diffusions, moving on circles. We prove that for small times and arbitrary initial Gibbs measures \nu, or for long times and both high- or infinite-temperature measure and dynamics, the evolved measure \nu^t stays Gibbsian. Furthermore we show that for a low-temperature initial measure \nu, evolving under infinite-temperature dynamics thee is a time interval (t_0, t_1) such that \nu^t fails to be Gibbsian in d=2.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 17:11:55 GMT" } ]
2007-11-26T00:00:00
[ [ "van Enter", "A. C. D.", "" ], [ "Ruszel", "W. M.", "" ] ]
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711.3622
John Gracey
J.A. Gracey
Recent results for Yang-Mills theory restricted to the Gribov region
6 latex pages
null
10.1142/9789812837271_0024
LTH 777
hep-th
null
We summarize recent results for the Gribov-Zwanziger Lagrangian which includes the effect of restricting the path integral to the first Gribov region. These include the two loop MSbar and one loop MOM gap equations for the Gribov mass.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 17:13:49 GMT" } ]
2017-08-23T00:00:00
[ [ "Gracey", "J. A.", "" ] ]
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711.3623
Gergely Zimanyi
B. Bako, I. Groma, G. Gyorgyi and G.T. Zimanyi
Dislocation Glasses: Aging during Relaxation and Coarsening
null
Physical Review Letters, vol. 98, 075701 (2007)
10.1103/PhysRevLett.98.075701
null
cond-mat.dis-nn cond-mat.soft
null
The dynamics of dislocations is reported to exhibit glassy properties. We study numerically various versions of 2d edge dislocation systems in the absence of externally applied stress. Two types of glassy behavior are identified: (i) dislocations gliding along randomly placed, but fixed, axes exhibit relaxation to their spatially disordered stable state; (ii) if both climb and annihilation is allowed, irregular cellular structures can form on a growing length scale before all dislocations annihilate. In all cases both the correlation function and the diffusion coefficient are found to exhibit aging. Relaxation in case (i) is a slow power law. In the transient process of (ii) the dynamical exponent z is about 6, which compares favorably to experiments on diblock co-polymers.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 17:14:04 GMT" } ]
2009-11-13T00:00:00
[ [ "Bako", "B.", "" ], [ "Groma", "I.", "" ], [ "Gyorgyi", "G.", "" ], [ "Zimanyi", "G. T.", "" ] ]
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711.3624
David McKee
David W. McKee, Jerome K. Busenitz, Igor Ostrovskiy
A C-13(alpha,n)O-16 calibration source for KamLAND
6 pages, 4 figures. Revised to agree with the published text
Nucl.Instrum.Meth. A, vol. 527, pp. 272-276 2008
10.1016/j.nima.2007.12.002
null
physics.ins-det
null
We report on the construction and performance of a calibration source for KamLAND using the reaction C-13(alpha,n)O-16 with Po-210 as the alpha progenitor. The source provides a direct measurement of this background reaction in our detector, high energy calibration points for the detector energy scale, and data on quenching of the neutron visible energy in KamLAND scintillator. We also discuss the possibility of using the reaction C-13(alpha,n)O-16 as a source of tagged slow neutrons.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 17:23:37 GMT" }, { "version": "v2", "created": "Mon, 24 Dec 2007 03:39:11 GMT" }, { "version": "v3", "created": "Thu, 20 Mar 2008 19:10:44 GMT" } ]
2009-09-29T00:00:00
[ [ "McKee", "David W.", "" ], [ "Busenitz", "Jerome K.", "" ], [ "Ostrovskiy", "Igor", "" ] ]
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711.3625
Marco Bertola
M. Bertola, S. Y. Lee
First Colonization of a Spectral Outpost in Random Matrix Theory
32 pages, 8 figures (typo corrected in Formula 4.13); some reference added and minor corrections
null
null
null
math-ph math.MP
null
We describe the distribution of the first finite number of eigenvalues in a newly-forming band of the spectrum of the random Hermitean matrix model. The method is rigorously based on the Riemann-Hilbert analysis of the corresponding orthogonal polynomials. We provide an analysis with an error term of order N^(-2 h) where 1/h = 2 nu+2 is the exponent of non-regularity of the effective potential, thus improving even in the usual case the analysis of the pertinent literature. The behavior of the first finite number of zeroes (eigenvalues) appearing in the new band is analyzed and connected with the location of the zeroes of certain Freud polynomials. In general all these newborn zeroes approach the point of nonregularity at the rate N^(-h) whereas one (a stray zero) lags behind at a slower rate of approach. The kernels for the correlator functions in the scaling coordinate near the emerging band are provided together with the subleading term: in particular the transition between K and K+1 eigenvalues is analyzed in detail.
[ { "version": "v1", "created": "Fri, 23 Nov 2007 02:08:21 GMT" }, { "version": "v2", "created": "Tue, 18 Mar 2008 19:25:18 GMT" } ]
2016-09-08T00:00:00
[ [ "Bertola", "M.", "" ], [ "Lee", "S. Y.", "" ] ]
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711.3626
Yu. A. Simonov
Yu.A.Simonov
Di-Pion Decays of Heavy Quarkonium in the Field Correlator Method
62 pages,8 tables,7 figures
Phys.Atom.Nucl.71:1048-1076,2008
10.1134/S1063778808060094
null
hep-ph
null
Mechanism of di-pion transitions $nS\to n'S\pi\pi(n=3,2; n'=2,1)$ in bottomonium and charmonium is studied with the use of the chiral string-breaking Lagrangian allowing for the emission of any number of $\pi(K,\eta),$ and not containing fitting parameters. The transition amplitude contains two terms, $M=a-b$, where first term (a) refers to subsequent one-pion emission: $\Upsilon(nS)\to\pi B\bar B^*\to\pi\Upsilon(n'S)\pi$ and second term (b) refers to two-pion emission: $\Upsilon(nS)\to\pi\pi B\bar B\to\pi\pi\Upsilon(n'S)$. The one-parameter formula for the di-pion mass distribution is derived, $\frac{dw}{dq}\sim$(phase space) $|\eta-x|^2$, where $x=\frac{q^2-4m^2_\pi}{q^2_{max}-4m^2_\pi},$ $q^2\equiv M^2_{\pi\pi}$. The parameter $\eta$ dependent on the process is calculated, using SHO wave functions and imposing PCAC restrictions (Adler zero) on amplitudes a,b. The resulting di-pion mass distributions are in agreement with experimental data.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 17:23:42 GMT" } ]
2008-11-26T00:00:00
[ [ "Simonov", "Yu. A.", "" ] ]
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711.3627
Achilleas Lazarides
Achilleas Lazarides and Bert Van Schaeybroeck
Collective Excitations of Trapped Imbalanced Fermion Gases
4 pages; accepted for publication in PRA
Phys. Rev. A 77, 041602(R) (2008)
10.1103/PhysRevA.77.041602
null
cond-mat.other cond-mat.stat-mech
null
We present a theoretical study of the collective excitations of a trapped imbalanced fermion gas at unitarity, when the system consists of a superfluid core and a normal outer shell. We formulate the relevant boundary conditions and treat the normal shell both hydrodynamically and collisionlessly. For an isotropic trap, we calculate the mode frequencies as a function of trap polarization. Out-of-phase modes with frequencies below the trapping frequency are obtained for the case of a hydrodynamic normal shell. For the collisionless case, we calculate the monopole mode frequencies, and find that all but the lowest mode may be damped.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 17:41:17 GMT" }, { "version": "v2", "created": "Mon, 17 Mar 2008 21:35:42 GMT" } ]
2008-04-08T00:00:00
[ [ "Lazarides", "Achilleas", "" ], [ "Van Schaeybroeck", "Bert", "" ] ]
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711.3628
Francesc Rossell\'o
Gabriel Cardona, Francesc Rossello, Gabriel Valiente
A Perl Package and an Alignment Tool for Phylogenetic Networks
5 pages
null
null
null
q-bio.PE cs.CE
null
Phylogenetic networks are a generalization of phylogenetic trees that allow for the representation of evolutionary events acting at the population level, like recombination between genes, hybridization between lineages, and lateral gene transfer. While most phylogenetics tools implement a wide range of algorithms on phylogenetic trees, there exist only a few applications to work with phylogenetic networks, and there are no open-source libraries either. In order to improve this situation, we have developed a Perl package that relies on the BioPerl bundle and implements many algorithms on phylogenetic networks. We have also developed a Java applet that makes use of the aforementioned Perl package and allows the user to make simple experiments with phylogenetic networks without having to develop a program or Perl script by herself. The Perl package has been accepted as part of the BioPerl bundle. It can be downloaded from http://dmi.uib.es/~gcardona/BioInfo/Bio-PhyloNetwork.tgz. The web-based application is available at http://dmi.uib.es/~gcardona/BioInfo/. The Perl package includes full documentation of all its features.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 18:05:49 GMT" } ]
2007-11-26T00:00:00
[ [ "Cardona", "Gabriel", "" ], [ "Rossello", "Francesc", "" ], [ "Valiente", "Gabriel", "" ] ]
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711.3629
Ted Hurley
Ted Hurley
Convolutional codes from units in matrix and group rings
null
null
null
null
cs.IT math.IT math.RA
null
A general method for constructing convolutional codes from units in Laurent series over matrix rings is presented. Using group ring as matrix rings, this forms a basis for in-depth exploration of convolutional codes from group ring encoding, wherein the ring in the group ring is itself a group ring. The method is used to algebraically construct series of convolutional codes. Algebraic methods are used to compute free distances and to construct convolutional codes to prescribed distances.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 18:02:27 GMT" } ]
2007-11-26T00:00:00
[ [ "Hurley", "Ted", "" ] ]
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711.363
Holger Ahlers
Holger Ahlers, Andreas Engel
Prior-predictive value from fast growth simulations
8 pages, 11 figures
null
10.1140/epjb/e2008-00165-2
null
physics.data-an
null
Building on a variant of the Jarzynski equation we propose a new method to numerically determine the prior-predictive value in a Bayesian inference problem. The method generalizes thermodynamic integration and is not hampered by equilibration problems. We demonstrate its operation by applying it to two simple examples and elucidate its performance. In the case of multi-modal posterior distributions the performance is superior to thermodynamic integration.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 18:08:01 GMT" } ]
2009-11-13T00:00:00
[ [ "Ahlers", "Holger", "" ], [ "Engel", "Andreas", "" ] ]
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711.3631
Marcelo Chiapparini Dr.
M. Chiapparini, M.E. Bracco, A. Delfino, M. Malheiro, D.P. Menezes, C. Providencia
Hadron production in non linear relativistic mean field models
18 pages, 2 figures
Nucl.Phys.A826:178-189,2009
10.1016/j.nuclphysa.2009.05.002
null
hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
By using a parametrization of the non-linear Walecka model which takes into account the binding energy of different hyperons, we present a study of particle production yields measured in central Au-Au collision at RHIC. Two sets of different hyperon-meson coupling constants are employed in obtaining the hadron production and chemical freeze-out parameters. These quantities show a weak dependence on the used hyperon-meson couplings. Results are in good overall accordance with experimental data. We have found that the repulsion among the baryons is quite small and, through a preliminary analysis of the effective mesonic masses, we suggest a way to improve the fittings.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 18:08:20 GMT" }, { "version": "v2", "created": "Fri, 29 May 2009 21:57:07 GMT" } ]
2009-06-23T00:00:00
[ [ "Chiapparini", "M.", "" ], [ "Bracco", "M. E.", "" ], [ "Delfino", "A.", "" ], [ "Malheiro", "M.", "" ], [ "Menezes", "D. P.", "" ], [ "Providencia", "C.", "" ] ]
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711.3632
Debasish Chatterjee
Debasish Chatterjee and Daniel Liberzon
On stability of randomly switched nonlinear systems
13 pages, no figures. A slightly modified version is scheduled to appear in IEEE Transactions on Automatic Control, Dec 2007
IEEE Transactions on Automatic Control, vol. 52, no. 12, pp. 2390-2394, Dec 2007
10.1109/TAC.2007.904253
null
math.OC
null
This article is concerned with stability analysis and stabilization of randomly switched nonlinear systems. These systems may be regarded as piecewise deterministic stochastic systems: the discrete switches are triggered by a stochastic process which is independent of the state of the system, and between two consecutive switching instants the dynamics are deterministic. Our results provide sufficient conditions for almost sure global asymptotic stability using Lyapunov-based methods when individual subsystems are stable and a certain ``slow switching'' condition holds. This slow switching condition takes the form of an asymptotic upper bound on the probability mass function of the number of switches that occur between the initial and current time instants. This condition is shown to hold for switching signals coming from the states of finite-dimensional continuous-time Markov chains; our results therefore hold for Markov jump systems in particular. For systems with control inputs we provide explicit control schemes for feedback stabilization using the universal formula for stabilization of nonlinear systems.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 18:22:55 GMT" } ]
2010-09-08T00:00:00
[ [ "Chatterjee", "Debasish", "" ], [ "Liberzon", "Daniel", "" ] ]
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711.3633
Andres Santos
Santos Bravo Yuste, Andr\'es Santos, and Mariano L\'opez de Haro
Depletion potential in the infinite dilution limit
10 pages, 5 figures; v2: few minor additions and reduction in the number of figures; v3: Fig. 2 corrected (see http://dx.doi.org/10.1063/1.4874639)
J. Chem. Phys. 128, 134507 (2008); 140, 179901(E) (2014)
10.1063/1.2841172
null
cond-mat.soft cond-mat.stat-mech physics.chem-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The depletion force and depletion potential between two in principle unequal "big" hard spheres embedded in a multicomponent mixture of "small" hard spheres are computed using the Rational Function Approximation method for the structural properties of hard-sphere mixtures [S. B. Yuste, A. Santos, and M. L\'opez de Haro, J. Chem. Phys. {\bf 108}, 3683 (1998)]. The cases of equal solute particles and of one big particle and a hard planar wall in a background monodisperse hard-sphere fluid are explicitly analyzed. An improvement over the performance of the Percus-Yevick theory and good agreement with available simulation results are found
[ { "version": "v1", "created": "Thu, 22 Nov 2007 18:15:51 GMT" }, { "version": "v2", "created": "Thu, 17 Jan 2008 16:56:08 GMT" }, { "version": "v3", "created": "Wed, 7 May 2014 07:02:13 GMT" } ]
2015-06-29T00:00:00
[ [ "Yuste", "Santos Bravo", "" ], [ "Santos", "Andrés", "" ], [ "de Haro", "Mariano López", "" ] ]
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711.3634
J. M. Pitarke
M. G. Vergniory, J. M. Pitarke, and P. M. Echenique
Self-energy and lifetime of Shockley and image states on Cu(100) and Cu(111): Beyond the GW approximation of many-body theory
8 pages, 5 figures, to appear in Phys. Rev. B
null
10.1103/PhysRevB.76.245416
null
cond-mat.mtrl-sci
null
We report many-body calculations of the self-energy and lifetime of Shockley and image states on the (100) and (111) surfaces of Cu that go beyond the $GW$ approximation of many-body theory. The self-energy is computed in the framework of the GW\Gamma approximation by including short-range exchange-correlation (XC) effects both in the screened interaction W (beyond the random-phase approximation) and in the expansion of the self-energy in terms of W (beyond the GW approximation). Exchange-correlation effects are described within time-dependent density-functional theory from the knowledge of an adiabatic nonlocal XC kernel that goes beyond the local-density approximation.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 18:18:12 GMT" } ]
2009-11-13T00:00:00
[ [ "Vergniory", "M. G.", "" ], [ "Pitarke", "J. M.", "" ], [ "Echenique", "P. M.", "" ] ]
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711.3635
Semikoz Dmitry
M.Kachelriess, E.Parizot, and D.V.Semikoz
The GZK horizon and constraints on the cosmic ray source spectrum from observations in the GZK regime
v2: 5 pages, 3 figures; shortened, title changed, matches version to be published
JETP Lett.88:553-557,2009
10.1134/S0021364008210017
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We discuss the GZK horizon of protons and present a method to constrain the injection spectrum of ultrahigh energy cosmic rays (UHECRs) from supposedly identified extragalactic sources. This method can be applied even when only one or two events per source are observed and is based on the analysis of the probability for a given source to populate different energy bins, depending on the actual CR injection spectral index. In particular, we show that for a typical source density of $4\times 10^{-5} Mpc^{-3}$, a data set of 100 events above $6\times 10^{19}$ eV allows one in 97% of all cases to distinguish a source spectrum $dN/dE\propto E^{-1.1}$ from one with $E^{-2.7}$ at 95% confidence level.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 18:28:15 GMT" }, { "version": "v2", "created": "Wed, 15 Oct 2008 14:31:32 GMT" } ]
2009-07-17T00:00:00
[ [ "Kachelriess", "M.", "" ], [ "Parizot", "E.", "" ], [ "Semikoz", "D. V.", "" ] ]
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711.3636
David Kribs
Nathaniel Johnston, David W. Kribs, and Vern I. Paulsen
Computing Stabilized Norms for Quantum Operations via the Theory of Completely Bounded Maps
21 pages, preprint version
null
null
null
quant-ph
null
The diamond and completely bounded norms for linear maps play an increasingly important role in quantum information science, providing fundamental stabilized distance measures for differences of quantum operations. Based on the theory of completely bounded maps, we formulate an algorithm to compute the norm of an arbitrary linear map. We present an implementation of the algorithm via Maple, discuss its efficiency, and consider the case of differences of unitary maps.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 18:35:58 GMT" } ]
2007-11-26T00:00:00
[ [ "Johnston", "Nathaniel", "" ], [ "Kribs", "David W.", "" ], [ "Paulsen", "Vern I.", "" ] ]
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711.3637
Bryna Kra
Bryna Kra and Bernard Host
Uniformity seminorms on $\ell^\infty$ and applications
null
null
null
null
math.DS math.NT
null
A key tool in recent advances in understanding arithmetic progressions and other patterns in subsets of the integers is certain norms or seminorms. One example is the norms on $\Z/N\Z$ introduced by Gowers in his proof of Szemer\'edi's Theorem, used to detect uniformity of subsets of the integers. Another example is the seminorms on bounded functions in a measure preserving system (associated to the averages in Furstenberg's proof of Szemer\'edi's Theorem) defined by the authors. For each integer $k\geq 1$, we define seminorms on $\ell^\infty(\Z)$ analogous to these norms and seminorms. We study the correlation of these norms with certain algebraically defined sequences, which arise from evaluating a continuous function on the homogeneous space of a nilpotent Lie group on a orbit (the nilsequences). Using these seminorms, we define a dual norm that acts as an upper bound for the correlation of a bounded sequence with a nilsequence. We also prove an inverse theorem for the seminorms, showing how a bounded sequence correlates with a nilsequence. As applications, we derive several ergodic theoretic results, including a nilsequence version of the Wiener-Wintner ergodic theorem, a nil version of a corollary to the spectral theorem, and a weighted multiple ergodic convergence theorem.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 19:14:57 GMT" } ]
2007-11-26T00:00:00
[ [ "Kra", "Bryna", "" ], [ "Host", "Bernard", "" ] ]
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711.3638
Carlos M. Naon
Liliana Arrachea, Carlos Na\'on and Mariano Salvay
Voltage profile and four terminal resistance of an interacting quantum wire
5 pages, 3 figures; added references, corrected typos, improved explanations
Phys. Rev. B 77, 233105, (2008)
10.1103/PhysRevB.77.233105
null
cond-mat.mes-hall
null
We investigate the behavior of the four-terminal resistance $R_{4pt}$ in a quantum wire described by a Luttinger liquid in two relevant situations: (i) in the presence of a single impurity within the wire and (ii) under the effect of asymmetries introduced by dirty voltage probes. In the first case, interactions leave a signature in a power law behavior of $R_{4pt}$ as a function of the voltage $V$ and the temperature $T$. In the second case interactions tend to mask the effect of the asymmetries. In both scenarios the occurrence of negative values of $R_{4pt}$ is explained in simple terms.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 19:15:17 GMT" }, { "version": "v2", "created": "Fri, 7 Mar 2008 12:18:25 GMT" } ]
2009-11-13T00:00:00
[ [ "Arrachea", "Liliana", "" ], [ "Naón", "Carlos", "" ], [ "Salvay", "Mariano", "" ] ]
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711.3639
K. Alkalaev
K.B. Alkalaev
On manifestly sp(2) invariant formulation of quadratic higher spin Lagrangians
23 pages; v2: extra refs, minor additions and typos, acknowledgements added; v3: a few clarifications added, published version
JHEP0806:081,2008
10.1088/1126-6708/2008/06/081
FIAN/TD/22/07
hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The Lagrangian frame-like formulation of free higher spin symmetric bosonic AdS(d) fields is given within a manifestly sp(2) invariant framework. It is designed to deal with infinite multiplets of fields appearing as gauge connections of the higher spin algebras.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 19:36:42 GMT" }, { "version": "v2", "created": "Thu, 31 Jan 2008 12:03:45 GMT" }, { "version": "v3", "created": "Thu, 4 Sep 2008 07:54:54 GMT" } ]
2008-11-07T00:00:00
[ [ "Alkalaev", "K. B.", "" ] ]
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711.364
Teppei Okumura
Teppei Okumura, Takahiko Matsubara, Daniel J. Eisenstein, Issha Kayo, Chiaki Hikage, Alexander S. Szalay, Donald P. Schneider
Large-Scale Anisotropic Correlation Function of SDSS Luminous Red Galaxies
11 pages, 9 figures, 1 table, typo corrected, references added with respect to published version
Astrophys.J.676:889-898,2008
10.1086/528951
null
astro-ph
null
We study the large-scale anisotropic two-point correlation function using 46,760 luminous red galaxies at redshifts 0.16 -- 0.47 from the Sloan Digital Sky Survey. We measure the correlation function as a function of separations parallel and perpendicular to the line-of-sight in order to take account of anisotropy of the large-scale structure in redshift space. We find a slight signal of baryonic features in the anisotropic correlation function, i.e., a ``baryon ridge'' which corresponds to a baryon acoustic peak in the spherically averaged correlation function which has already been reported using the same sample. The baryon ridge has primarily a spherical structure with a known radius in comoving coordinates. It enables us to divide the redshift distortion effects into dynamical and geometrical components and provides further constraints on cosmological parameters, including the dark energy equation-of-state. With an assumption of a flat $\Lambda$ cosmology, we find the best-fit values of $\Omega_{\rm m} = 0.218^{+0.047}_{-0.037}$ and $\Omega_{\rm b} = 0.047^{+0.016}_{-0.016}$ (68% C.L.) when we use the overall shape of the anisotropic correlation function of $40<s<200\himpc$ including a scale of baryon acoustic oscillations. When an additional assumption $\Omega_{\rm b}h^2=0.024$ is adopted, we obtain $\Omega_{\rm DE}=0.770^{+0.051}_{-0.040}$ and $w=-0.93^{+0.45}_{-0.35}$. These constraints are estimated only from our data of the anisotropic correlation function, and they agree quite well with values both from the cosmic microwave background (CMB) anisotropies and from other complementary statistics using the LRG sample. With the CMB prior from the 3 year WMAP results, we give stronger constraints on those parameters.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 19:43:09 GMT" }, { "version": "v2", "created": "Mon, 14 Apr 2008 10:12:08 GMT" } ]
2009-08-21T00:00:00
[ [ "Okumura", "Teppei", "" ], [ "Matsubara", "Takahiko", "" ], [ "Eisenstein", "Daniel J.", "" ], [ "Kayo", "Issha", "" ], [ "Hikage", "Chiaki", "" ], [ "Szalay", "Alexander S.", "" ], [ "Schneider", "Donald P.", "" ] ]
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711.3641
J. E. Horvath
Daniel C. Guariento, J. E. Horvath, P. S. Cust\'odio and J. A. de Freitas Pacheco
Evolution of Primordial Black Holes in a radiation and phantom energy environment
6 pp, 2 figs., to appear in GRG
Gen.Rel.Grav.40:1593-1602,2008
10.1007/s10714-007-0562-8
null
gr-qc
null
In this work we extend previous work on the evolution of a Primordial Black Hole (PBH) to address the presence of a dark energy component with a super-negative equation of state as a background, investigating the competition between the radiation accretion, the Hawking evaporation and the phantom accretion, the latter two causing a decrease on black hole mass. It is found that there is an instant during the matter-dominated era after which the radiation accretion becomes negligible compared to the phantom accretion. The Hawking evaporation may become important again depending on a mass threshold. The evaporation of PBHs is quite modified at late times by these effects, but only if the Generalized Second Law of thermodynamics is violated.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 19:52:58 GMT" } ]
2008-11-26T00:00:00
[ [ "Guariento", "Daniel C.", "" ], [ "Horvath", "J. E.", "" ], [ "Custódio", "P. S.", "" ], [ "Pacheco", "J. A. de Freitas", "" ] ]
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711.3642
Joost Vercruysse
Jose Gomez-Torrecillas and Joost Vercruysse
Galois theory in bicategories
39 pages
null
null
null
math.RA math.CT
null
We develop a Galois (descent) theory for comonads within the framework of bicategories. We give generalizations of Beck's theorem and the Joyal-Tierney theorem. Many examples are provided, including classical descent theory, Hopf-Galois theory over Hopf algebras and Hopf algebroids, Galois theory for corings and group-corings, and Morita-Takeuchi theory for corings. As an application we construct a new type of comatrix corings based on (dual) quasi bialgebras.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 20:06:30 GMT" } ]
2007-11-26T00:00:00
[ [ "Gomez-Torrecillas", "Jose", "" ], [ "Vercruysse", "Joost", "" ] ]
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711.3643
Slawomir Dinew
S{\l}awomir Dinew, Zhou Zhang
Stability of Bounded Solutions for Degenerate Complex Monge-Amp\`ere equations
23 pages, Reason for replacement: a new section is added
null
null
null
math.CV
null
We generalize and strenghten Ko{\l}odziej's stability theorem. In particular we give sharp stability exponent and treat the case with more singular right hand side of the Monge-Amp\`ere equation.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 20:16:57 GMT" }, { "version": "v2", "created": "Sat, 26 Jan 2008 20:23:51 GMT" } ]
2008-01-26T00:00:00
[ [ "Dinew", "Sławomir", "" ], [ "Zhang", "Zhou", "" ] ]
[ 0.0789322183, 0.0368176922, -0.0597312115, 0.0783647001, -0.1195570081, -0.0012939102, -0.0316863917, -0.0442427136, -0.0986534506, -0.0096477969, 0.0182787906, -0.0588799343, -0.0931201503, 0.0395370498, -0.0472931191, 0.2007119954, 0.0142352292, 0.0460871458, 0.093309328, 0.0951064676, 0.0285650454, -0.0963360891, 0.0894312933, 0.0007670353, 0.0141406432, -0.0031154342, 0.0171437562, -0.0103985751, 0.1128413826, -0.0833777711, 0.0911338404, -0.0445264727, -0.0525899492, -0.011758252, -0.0305986479, 0.0767567307, -0.0419017039, 0.0467019565, -0.0829994231, -0.0823373199, -0.0244032498, -0.040719375, -0.1152060404, 0.1217324883, 0.0597785041, -0.0368886329, 0.0152875008, 0.0638930053, 0.0522588976, -0.0349732637, -0.0560423471, 0.0404356159, 0.0824792013, -0.1129359677, 0.0053677689, 0.0149091557, 0.0788376331, 0.0891002417, -0.0109897386, 0.0067570047, 0.0231499821, -0.1042340398, -0.0461344384, 0.0128637282, -0.141122669, 0.0094586238, -0.1502029449, -0.0026794509, -0.0031893298, 0.0756217018, -0.0116400188, -0.0894785821, 0.0270280186, 0.0455432758, 0.0085245846, -0.0500361212, -0.0264368542, 0.0831886008, -0.0296764337, 0.0598730892, -0.0109779155, 0.0127927894, 0.0320174433, 0.0337436423, 0.0739191473, 0.0449521095, 0.007702867, 0.0041499711, -0.1003559977, 0.09184324, -0.0076260157, 0.0517859682, 0.019957697, -0.0377872027, 0.102342315, -0.0156067293, 0.0636565387, 0.0503198802, -0.0529210009, -0.0510292761, -0.0070525864, -0.00965962, 0.1150168702, -0.0654063821, 0.1635396034, 0.0015015566, 0.0284941047, -0.0307878219, -0.0077146902, 0.0222395901, 0.0264132079, -0.0446683504, -0.0296291392, -0.0683858544, 0.0120538343, -0.0866882876, -0.0759527534, -0.0057756724, -0.0300784241, 0.1205974594, 0.0132775437, -0.0086369058, 0.0163279492, -0.0029646875, 0.0526372418, 0.015488497, 0.0039460198, 0.006603302, -0.0293690283, -0.0775607154, -0.0008239349, -0.0314499252, -0.0318282694, -0.0414287746, -0.0440062471, 0.0071294378, 0.0452595167, 0.0439589545, 0.168268919, 0.0890056491, 0.111044243, 0.0940660164, -0.0048593683, -0.0064259525, -0.0045283162, 0.0635619536, 0.0301966574, 0.0010796132, -0.047387708, 0.0035351608, 0.0426583961, -0.0450703427, 0.005651528, 0.0647915751, -0.0556640029, 0.0161033068, 0.0006273728, 0.058217831, 0.0920797065, 0.0280684661, 0.0694735944, 0.0910865515, -0.1003559977, -0.0125326766, 0.0810131133, 0.0447629392, -0.0681020916, -0.0286359843, 0.0280448198, -0.1728090644, 0.1120846942, -0.0514076203, -0.128164351, 0.0039105499, 0.044455532, -0.0279502347, -0.0541979149, -0.1490679085, -0.0652645081, -0.0550491922, 0.0963833779, 0.0675818697, 0.0033459882, 0.0838034078, 0.0207380336, 0.0508401059, -0.0206434466, 0.0517859682, 0.0413814783, -0.0007855092, -0.0646496937, 0.0149919195, 0.005420974, 0.0904244483, 0.0328450724, -0.1097200364, 0.0593528673, 0.0300547779, -0.0576503128, 0.0363211147, 0.0125563238, -0.1081120744, 0.0331997685, -0.0157840792, 0.0045696977, 0.0819589794, -0.0720274225, 0.0916540697, -0.1036665216, 0.0031745506, -0.0066742417, -0.0283758715, 0.0696627647, -0.0494213104, -0.0108360359, 0.0163870659, -0.1819839329, 0.0809185281, -0.0027075312, 0.1243809089, -0.057224676, -0.0090921028, 0.008932488, 0.0495631881, 0.0789795071, -0.0318519175, 0.054954607, -0.0501307063, 0.0349969082, 0.0119060427, 0.0410267822, -0.0298656058, 0.0380473137, 0.0329869501, 0.0523534827, -0.0280211736, -0.0123789739, -0.0205488615, -0.0962887928, 0.0450466983, -0.0739191473, 0.0837088227, -0.0236110911, 0.0789322183, -0.018314261, 0.0313080437, -0.0247579478, 0.0461817309, -0.053015586, -0.0175930411, -0.0320647359, 0.0513603278, 0.0286832768, -0.0037923171, -0.072878696, -0.0333652981 ]
711.3644
Peter Kazinski
P.O. Kazinski
Fluctuations as stochastic deformation
42 pp. revtex preprint style; some comments and references added
Phys. Rev. E 77, 041119 (2008)
10.1103/PhysRevE.77.041119
null
cond-mat.stat-mech hep-th
null
A notion of stochastic deformation is introduced and the corresponding algebraic deformation procedure is developed. This procedure is analogous to the deformation of an algebra of observables like deformation quantization, but for an imaginary deformation parameter (the Planck constant). This method is demonstrated on diverse relativistic and nonrelativistic models with finite and infinite degrees of freedom. It is shown that under stochastic deformation the model of a nonrelativistic particle interacting with the electromagnetic field on a curved background passes into the stochastic model described by the Fokker-Planck equation with the diffusion tensor being the inverse metric tensor. The first stochastic correction to the Newton equations for this system is found. The Klein-Kramers equation is also derived as the stochastic deformation of a certain classical model. Relativistic generalizations of the Fokker-Planck and Klein-Kramers equations are obtained by applying the procedure of stochastic deformation to appropriate relativistic classical models. The analog of the Fokker-Planck equation associated with the stochastic Lorentz-Dirac equation is derived too. The stochastic deformation of the models of a free scalar field and an electromagnetic field is investigated. It turns out that in the latter case the obtained stochastic model describes a fluctuating electromagnetic field in a transparent medium.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 20:34:11 GMT" }, { "version": "v2", "created": "Wed, 13 Feb 2008 17:43:52 GMT" }, { "version": "v3", "created": "Mon, 24 Mar 2008 04:45:33 GMT" } ]
2008-04-19T00:00:00
[ [ "Kazinski", "P. O.", "" ] ]
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711.3645
Heinrich Massold
Heinrich Massold
Diophantine Approximation on varieties III: Approximation of non-algebraic points by algebraic points
42 pages
null
null
null
math.NT math.AG
null
For $\theta$ a non-algebraic point on a quasi projective variety over a number field, I prove that $\theta$ has an approximation by a series of algebraic points of bounded height and degree which is essentially best possible. Applications of this result will include a proof of a slightly strengthened version of the Philippon criterion, some new algebraic independence criteria, statements concerning metric transcendence theory on varieties of arbitrary dimension, and a rather accurate estimate for the number of algebraic points of bounded height and degree on quasi projective varieties over number fields.
[ { "version": "v1", "created": "Fri, 23 Nov 2007 18:35:06 GMT" } ]
2007-11-26T00:00:00
[ [ "Massold", "Heinrich", "" ] ]
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711.3646
Jianhao Chen
J. H. Chen, C. Jang, S. Xiao, M. Ishigami, M. S. Fuhrer
Intrinsic and Extrinsic Performance Limits of Graphene Devices on SiO2
16 pages, 3 figures
Nature Nanotechnology 3, 206 - 209 (2008)
10.1038/nnano.2008.58
null
cond-mat.mtrl-sci cond-mat.other
null
The linear dispersion relation in graphene[1,2] gives rise to a surprising prediction: the resistivity due to isotropic scatterers (e.g. white-noise disorder[3] or phonons[4-8]) is independent of carrier density n. Here we show that acoustic phonon scattering[4-6] is indeed independent of n, and places an intrinsic limit on the resistivity in graphene of only 30 Ohm at room temperature (RT). At a technologically-relevant carrier density of 10^12 cm^-2, the mean free path for electron-acoustic phonon scattering is >2 microns, and the intrinsic mobility limit is 2x10^5 cm^2/Vs, exceeding the highest known inorganic semiconductor (InSb, ~7.7x10^4 cm^2/Vs[9]) and semiconducting carbon nanotubes (~1x10^5 cm^2/Vs[10]). We also show that extrinsic scattering by surface phonons of the SiO2 substrate[11,12] adds a strong temperature dependent resistivity above ~200 K[8], limiting the RT mobility to ~4x10^4 cm^2/Vs, pointing out the importance of substrate choice for graphene devices[13].
[ { "version": "v1", "created": "Fri, 23 Nov 2007 20:49:33 GMT" }, { "version": "v2", "created": "Wed, 5 Dec 2007 21:10:08 GMT" } ]
2008-04-14T00:00:00
[ [ "Chen", "J. H.", "" ], [ "Jang", "C.", "" ], [ "Xiao", "S.", "" ], [ "Ishigami", "M.", "" ], [ "Fuhrer", "M. S.", "" ] ]
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711.3647
Hartmut Hafermann
S. Brener, H. Hafermann, A. N. Rubtsov, M. I. Katsnelson and A. I. Lichtenstein
Dual Fermion Approach to Susceptibility of Correlated Lattice Fermions
10 pages, 5 figures; substantially extended results section compared to version 1
Phys. Rev. B 77, 195105 (2008)
10.1103/PhysRevB.77.195105
null
cond-mat.str-el
null
In this paper, we show how the two-particle Green function (2PGF) can be obtained within the framework of the Dual Fermion approach. This facilitates the calculation of the susceptibility in strongly correlated systems where long-ranged non-local correlations cannot be neglected. We formulate the Bethe-Salpeter equations for the full vertex in the particle-particle and particle-hole channels and introduce an approximation for practical calculations. The scheme is applied to the two-dimensional Hubbard model at half filling. The spin-spin susceptibility is found to strongly increase for the wavevector $\vc{q}=(\pi,\pi)$, indicating the antiferromagnetic instability. We find a suppression of the critical temperature compared to the mean-field result due to the incorporation of the non-local spin-fluctuations.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 21:17:35 GMT" }, { "version": "v2", "created": "Thu, 15 May 2008 16:14:28 GMT" } ]
2009-11-13T00:00:00
[ [ "Brener", "S.", "" ], [ "Hafermann", "H.", "" ], [ "Rubtsov", "A. N.", "" ], [ "Katsnelson", "M. I.", "" ], [ "Lichtenstein", "A. I.", "" ] ]
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711.3648
Todor Popov
Jean-Louis Loday, Todor Popov
Parastatistics Algebra and Super Semistandard Young Tableaux
8 pages, based on a talk given at the VII International Workshop "Lie Theory and Its Applications in Physics" Varna, 18-24 June 2007
null
null
null
math-ph math.MP
null
We consider the parastatistics algebra with both parabosonic and parafermionic operators and show that the states in the universal parastatistics Fock space are in bijection with the Super Semistandard Young Tableaux (SSYT). Using deformation of the parastatistics algebra we get a monoid structure on SSYT which is a super version of the plactic monoid.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 21:27:59 GMT" } ]
2007-11-26T00:00:00
[ [ "Loday", "Jean-Louis", "" ], [ "Popov", "Todor", "" ] ]
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711.3649
Mario Agio
Nassiredin M. Mojarad, Vahid Sandoghdar, and Mario Agio
Plasmon spectra of nanospheres under a tightly focused beam
19 pages, 7 figures
J. Opt. Soc. Am. B 25, 651 (2008)
10.1364/JOSAB.25.000651
null
physics.optics physics.chem-ph
null
We study the modification of the far-field cross sections and the near-field enhancement for gold and silver nanospheres illuminated by a tightly focused beam. Using a multipole-expansion approach we obtain an analytical solution to the scattering problem and provide insight on the effects of focusing on the optical response. Large differences with respect to Mie theory are found especially when the nanoparticle supports quadrupole or higher-order resonances.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 21:43:16 GMT" } ]
2008-04-02T00:00:00
[ [ "Mojarad", "Nassiredin M.", "" ], [ "Sandoghdar", "Vahid", "" ], [ "Agio", "Mario", "" ] ]
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711.365
H. C. Spruit
H.C. Spruit
Origin of neutron star magnetic fields
Review to appear in "40 years of pulsars", ed. A. Cumming, AIP. v2: Updated references and discussion section. v3: reference added
AIP Conf.Proc.983:391-398,2008
10.1063/1.2900262
null
astro-ph
null
Possible origins of the magnetic fields of neutron stars include inheritance from the main sequence progenitor and dynamo action at some stage of evolution of progenitor. Inheritance is not sufficient to explain the fields of magnetars. Energetic considerations point to differential rotation in the final stages of core collapse process as the most likely source of field generation, at least for magnetars. A runaway phase of exponential growth is needed to achieve sufficient field amplification during relevant phase of core collapse; it can probably be provided by a some form of magnetorotational instability. Once formed in core collapse, the field is in danger of decaying again by magnetic instabilities. The evolution of a magnetic field in a newly formed neutron star is discussed, with emphasis on the existence of stable equilibrium configurations as end products of this evolution, and the role of magnetic helicity in their existence.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 22:13:09 GMT" }, { "version": "v2", "created": "Mon, 17 Dec 2007 15:42:42 GMT" }, { "version": "v3", "created": "Mon, 28 Apr 2008 09:39:35 GMT" } ]
2009-06-23T00:00:00
[ [ "Spruit", "H. C.", "" ] ]
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711.3651
Daqing Wan
Daqing Wan
Lectures on zeta functions over finite fields
21 pages
null
null
null
math.AG math.NT
null
These are the notes from the summer school in G\"ottingen sponsored by NATO Advanced Study Institute on Higher-Dimensional Geometry over Finite Fields that took place in 2007. The aim was to give a short introduction on zeta functions over finite fields, focusing on moment zeta functions and zeta functions of affine toric hypersurfaces.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 22:24:28 GMT" } ]
2007-11-26T00:00:00
[ [ "Wan", "Daqing", "" ] ]
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711.3652
Enrique Solano
L. Lamata, J. Leon, D. Perez-Garcia, D. Salgado, and E. Solano
Sequential Implementation of Global Quantum Operations
4 pages, accepted in Physical Review Letters
Phys. Rev. Lett. 101, 180506 (2008)
10.1103/PhysRevLett.101.180506
null
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the possibility for a global unitary applied on an arbitrary number of qubits to be decomposed in a sequential unitary procedure, where an ancillary system is allowed to interact only once with each qubit. We prove that sequential unitary decompositions are in general impossible for genuine entangling operations, even with an infinite-dimensional ancilla, being the controlled-NOT gate a paradigmatic example. Nevertheless, we find particular nontrivial operations in quantum information that can be performed in a sequential unitary manner, as is the case of quantum error correction and quantum cloning.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 22:27:48 GMT" }, { "version": "v2", "created": "Fri, 31 Oct 2008 17:56:25 GMT" } ]
2009-11-13T00:00:00
[ [ "Lamata", "L.", "" ], [ "Leon", "J.", "" ], [ "Perez-Garcia", "D.", "" ], [ "Salgado", "D.", "" ], [ "Solano", "E.", "" ] ]
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711.3653
Joseph D. Lykken
Gabriela Barenboim and Joseph Lykken
Self-accelerating solutions of scalar-tensor gravity
14 pages, 3 figures
JCAP 0803:017,2008
10.1088/1475-7516/2008/03/017
FERMILAB-PUB-07-618-T, FTUV 07-1105
astro-ph hep-ph
null
Scalar-tensor gravity is the simplest and best understood modification of general relativity, consisting of a real scalar field coupled directly to the Ricci scalar curvature. Models of this type have self-accelerating solutions. In an example inspired by string dilaton couplings, scalar-tensor gravity coupled to ordinary matter exhibits a de Sitter type expansion, even in the presence of a {\it negative} cosmological constant whose magnitude exceeds that of the matter density. This unusual behavior does not require phantoms, ghosts or other exotic sources. More generally, we show that any expansion history can be interpreted as arising partly or entirely from scalar-tensor gravity. To distinguish any quintessence or inflation model from its scalar-tensor variants, we use the fact that scalar-tensor models imply deviations of the post-Newtonian parameters of general relativity, and time variation of the Newton's gravitational coupling $G$. We emphasize that next-generation probes of modified GR and the time variation of $G$ are an essential complement to dark energy probes based on luminosity-distance measurements.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 22:47:07 GMT" } ]
2009-09-17T00:00:00
[ [ "Barenboim", "Gabriela", "" ], [ "Lykken", "Joseph", "" ] ]
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711.3654
Mikko Stenlund
Mikko Stenlund
Asymptotic Expansion of the Homoclinic Splitting Matrix for the Rapidly, Quasiperiodically, Forced Pendulum
32 pages
J. Math. Phys. 51, 072902 (2010)
10.1063/1.3398483
null
math-ph math.MP
null
We study a Hamiltonian describing a pendulum coupled with several anisochronous oscillators, devising an asymptotic expansion for the splitting (matrix) associated with a homoclinic point. This expansion consists of contributions that are manifestly exponentially small in the limit of vanishing hyperbolicity, by a shift-of-contour argument. Hence, we infer a similar upper bound on the splitting itself.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 23:40:45 GMT" } ]
2011-10-18T00:00:00
[ [ "Stenlund", "Mikko", "" ] ]
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711.3655
Mario Agio
U. H{\aa}kanson, M. Agio, S. K\"uhn, L. Rogobete, T. Kalkbrenner, and V. Sandoghdar
Coupling of plasmonic nanoparticles to their environments in the context of van der Waals-Casimir interactions
9 pages, 7 figures
Phys. Rev. B 77, 155408 (2008)
10.1103/PhysRevB.77.155408
null
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present experiments in which the interaction of a single gold nanoparticle with glass substrates or with another gold particle can be tuned by in-situ control of their separations using scanning probe technology. We record the plasmon resonances of the coupled systems as a function of the polarization of the incident field and the particle position. The distinct spectral changes of the scattered light from the particle pair are in good agreement with the outcome of finite difference time-domain (FDTD) calculations. We believe our experimental technique holds promise for the investigation of the van der Waals-Casimir type interactions between nanoscopic neutral bodies.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 23:32:22 GMT" }, { "version": "v2", "created": "Wed, 17 Sep 2008 08:52:06 GMT" } ]
2016-03-28T00:00:00
[ [ "Håkanson", "U.", "" ], [ "Agio", "M.", "" ], [ "Kühn", "S.", "" ], [ "Rogobete", "L.", "" ], [ "Kalkbrenner", "T.", "" ], [ "Sandoghdar", "V.", "" ] ]
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711.3656
Jordan Bell
Leonhard Euler
Various analytic observations on combinations
25 pages
null
null
null
math.HO math.CO math.NT
null
E158 in the Enestrom index. Translation of the Latin original "Observationes analyticae variae de combinationibus" (1741). This paper introduces the problem of partitions, or partitio numerorum (the partition of integers). In the first part of the paper Euler looks at infinite symmetric functions. He defines three types of series: the first denoted with capital Latin letters are sums of powers, e.g. $A=a+b+c+...$, $B=a^2+b^2+c^3+...$, etc.; the second denoted with lower case Greek letters are the elementary symmetric functions; the third denoted with Germanic letters are sums of all combinations of $n$ symbols, e.g. $\mathfrak{A}=a+b+c+...$ is the series for $n=1$, $\mathfrak{B}=a^2+ab+b^2+ac+bc+c^2+...$ is the series for $n=2$, etc. Euler proves a lot of relations between these series. He defines some infinite products and proves some more relations between the products and these series. Then in \S 17 he looks at the particular case where $a=n,b=n^2,c=n^3$ etc. In \S 19 he says the Naud\'e has proposed studying the number of ways to break an integer into a certain number of parts. Euler proves his recurrence relations for the number of partitions into a $\mu$ parts with repetition and without repetition. Finally at the end of the paper Euler states the pentagonal number theorem, but says he hasn't been able to prove it rigorously.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 23:38:49 GMT" } ]
2007-11-26T00:00:00
[ [ "Euler", "Leonhard", "" ] ]
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711.3657
Artin Armagan
Artin Armagan and Russell L. Zaretzki
Bayesian Shrinkage Variable Selection
null
null
null
null
stat.ME
null
Withdrawn due to extensions and submission as another paper.
[ { "version": "v1", "created": "Fri, 23 Nov 2007 16:01:51 GMT" }, { "version": "v2", "created": "Sun, 25 Nov 2007 00:44:07 GMT" }, { "version": "v3", "created": "Sun, 2 Dec 2007 19:49:03 GMT" }, { "version": "v4", "created": "Wed, 16 Apr 2008 20:37:59 GMT" } ]
2008-04-16T00:00:00
[ [ "Armagan", "Artin", "" ], [ "Zaretzki", "Russell L.", "" ] ]
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711.3658
Weizhe Zheng
Weizhe Zheng
Sur l'ind\'ependance de l en cohomologie l-adique sur les corps locaux
38 pages, in French; v2 minor changes
Ann. sci. \'Ecole norm. sup\'er. (4) 42 (2009), no. 2, 291--334
null
null
math.AG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Gabber deduced his theorem of independence of $l$ of intersection cohomology from a general stability result over finite fields. In this article, we prove an analogue of this general result over local fields. More precisely, we introduce a notion of independence of $l$ for systems of complexes of $l$-adic sheaves on schemes of finite type over a local field, equivariant under finite groups. We establish its stability by Grothendieck's six operations and the nearby cycle functor. Our method leads to a new proof of Gabber's theorem. We also give a generalization to algebraic stacks. ----- Gabber a d\'eduit son th\'eor\`eme d'ind\'ependance de $l$ de la cohomologie l'intersection d'un r\'esultat g\'en\'eral de stabilit\'e sur les corps finis. Dans cet article, nous d\'emontrons un analogue sur les corps locaux de ce r\'esultat g\'en\'eral. Plus pr\'ecis\'ement, nous introduisons une notion d'ind\'ependance de $l$ pour les syst\`emes de complexes de faisceaux $l$-adiques sur les sch\'emas de type fini sur un corps local \'equivariants sous des groupes finis et nous \'etablissons sa stabilit\'e par les six op\'erations de Grothendieck et le foncteur des cycles proches. Notre m\'ethode permet d'obtenir une nouvelle d\'emonstration du th\'eor\`eme de Gabber. Nous donnons aussi une g\'en\'eralisation aux champs alg\'ebriques.
[ { "version": "v1", "created": "Fri, 23 Nov 2007 02:08:14 GMT" }, { "version": "v2", "created": "Fri, 6 Mar 2009 20:12:42 GMT" } ]
2016-01-26T00:00:00
[ [ "Zheng", "Weizhe", "" ] ]
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711.3659
Tien Quang Nguyen
Nguyen Tien Quang, D. D. Hanh and N. T. Thuy
On the Axiomatics of Ann-Categories
13 pages
JP Journal of Algebra, Number Theory and Applications, Vol. 11, No. 1 (2008) 59-72
null
null
math.CT
null
In this paper, we have studied the axiomatics of {\it Ann-categories} and {\it categorical rings.} These are the categories with distributivity constraints whose axiomatics are similar with those of ring structures. The main result we have achieved is proving the independence of the axiomatics of Ann-category definition. And then we have proved that after adding an axiom into the definition of categorical rings, we obtain the new axiomatics which is equivalent to the one of Ann-categories.
[ { "version": "v1", "created": "Fri, 23 Nov 2007 00:55:11 GMT" } ]
2013-01-08T00:00:00
[ [ "Quang", "Nguyen Tien", "" ], [ "Hanh", "D. D.", "" ], [ "Thuy", "N. T.", "" ] ]
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711.366
Bernardo Borges
B. W. Borges, R. Baptista, C. Papadimitriou, O. Giannakis
Cyclical period changes in HT Cas: a clear difference between systems above and below the period gap
Submitted to Astronomy & Astrophysics (7 pages and 3 figures)
null
10.1051/0004-6361:20078596
null
astro-ph
null
We report the identification of cyclical changes in the orbital period of the eclipsing cataclysmic variable HT Cas. We measured new white dwarf mid-eclipse timings and combined with published measurements to construct an observed-minus-calculated diagram covering 29 years of observations. The data present cyclical variations that can be fitted by a linear plus sinusoidal function with period 36 yr and semi-amplitude ~ 40 s. The statistical significance of this period by an F-test is larger than 99.9 per cent. We combine our results with those in the literature to revisit the issue of cyclical period changes in cataclysmic variables and their interpretation in terms of a solar-type magnetic activity cycle in the secondary star. A diagram of fractional period change (Delta P/P) versus the angular velocity of the active star (Omega) for cataclysmic variables, RS CVn, W UMa and Algols reveal that close binaries with periods above the gap (secondaries with convective envelopes) satisfy a relationship Delta P/P \propto Omega^{-0.7+/-0.1}. Cataclysmic variables below the period gap (with fully convective secondaries) deviate from this relationship by more than 3-sigma, with average fractional period changes ~ 5 times smaller than those of the systems above the gap.
[ { "version": "v1", "created": "Fri, 23 Nov 2007 01:18:25 GMT" } ]
2009-11-13T00:00:00
[ [ "Borges", "B. W.", "" ], [ "Baptista", "R.", "" ], [ "Papadimitriou", "C.", "" ], [ "Giannakis", "O.", "" ] ]
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711.3661
Fabio Scardigli
Fabio Scardigli and Roberto Casadio
Is the Equivalence Principle violated by Generalized Uncertainty Principles and Holography in a brane-world?
5 pages, latex file
Int. J. Mod. Phys. D18:319-327, 2009
10.1142/S0218271809014455
null
hep-th
null
It has been recently debated whether a class of generalized uncertainty principles that include gravitational sources of error are compatible with the holographic principle in models with extra spatial dimensions. We had in fact shown elsewhere that the holographic scaling is lost when more than four space-time dimensions are present. However, we shall show here that the validity of the holographic counting can be maintained also in models with extra spatial dimensions, but at the intriguing price that the equivalence principle for a point-like source be violated and the inertial mass differ from the gravitational mass in a specific non-trivial way.
[ { "version": "v1", "created": "Fri, 23 Nov 2007 15:46:39 GMT" } ]
2009-04-17T00:00:00
[ [ "Scardigli", "Fabio", "" ], [ "Casadio", "Roberto", "" ] ]
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711.3662
Alexandre Martins de Souza
A. M. Souza, M. S. Reis, D. O. Soares-Pinto, I. S. Oliveira and R. S. Sarthour
Experimental Determination of Thermal Entanglement in Spin Clusters using Magnetic Susceptibility Measurements
Submited to Phys. Rev. B
PHYSICAL REVIEW B 77 104402 (2008)
10.1103/PhysRevB.77.104402
null
quant-ph
null
The present work reports an experimental observation of thermal entanglement in a clusterized spin chain formed in the compound Na$_2$Cu$_5$Si$_4$O$_{14}$. The presence of entanglement was investigated through two measured quantities, an Entanglement Witness and the Entanglement of Formation, both derived from the magnetic susceptibility. It was found that pairwise entanglement exists below $ \sim 200$ K. Tripartite entanglement was also observed below $ \sim 240$ K. A theoretical study of entanglement evolution as a function of applied field and temperature is also presented.
[ { "version": "v1", "created": "Fri, 23 Nov 2007 02:32:54 GMT" } ]
2009-11-13T00:00:00
[ [ "Souza", "A. M.", "" ], [ "Reis", "M. S.", "" ], [ "Soares-Pinto", "D. O.", "" ], [ "Oliveira", "I. S.", "" ], [ "Sarthour", "R. S.", "" ] ]
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711.3663
P.F. Wang
P.F. Wang, J.P. Li
The one-way function based on computational uncertainty principle
11 pages
null
null
null
cs.CR
null
This paper presents how to make use of the advantage of round-off error effect in some research areas. The float-point operation complies with the reproduce theorem without the external random perturbation. The computation uncertainty principle and the high nonlinear of chaotic system guarantee the numerical error is random and departure from the analytical result. Combining these two properties we can produce unilateral one-way function and provide a case of utilizing this function to construct encryption algorithm. The multiple-precision (MP) library is used to analyze nonlinear dynamics systems and achieve the code. As an example, we provide a scheme of encrypting a plaintext by employing the one-way function with Lorenz system. Since the numerical solution used in this scheme is beyond the maximum effective computation time (MECT) and it cannot satisfy the requirements of return-map analysis and phase space reconstruction, it can block some existing attacks.
[ { "version": "v1", "created": "Fri, 23 Nov 2007 02:37:12 GMT" } ]
2007-11-26T00:00:00
[ [ "Wang", "P. F.", "" ], [ "Li", "J. P.", "" ] ]
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711.3664
Eric Vigoda
Nayantara Bhatnagar, Juan Vera, Eric Vigoda and Dror Weitz
Reconstruction for Colorings on Trees
Suggestions by journal referees were incorporated
SIAM J. on Discrete Math, 25(2):809-826, 2011
null
null
math.PR math-ph math.CO math.MP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Consider $k$-colorings of the complete tree of depth $\ell$ and branching factor $\Delta$. If we fix the coloring of the leaves, as $\ell$ tends to $\infty$, for what range of $k$ is the root uniformly distributed over all $k$ colors? This corresponds to the threshold for uniqueness of the infinite-volume Gibbs measure. It is straightforward to show the existence of colorings of the leaves which ``freeze'' the entire tree when $k\le\Delta+1$. For $k\geq\Delta+2$, Jonasson proved the root is ``unbiased'' for any fixed coloring of the leaves and thus the Gibbs measure is unique. What happens for a {\em typical} coloring of the leaves? When the leaves have a non-vanishing influence on the root in expectation, over random colorings of the leaves, reconstruction is said to hold. Non-reconstruction is equivalent to extremality of the free-boundary Gibbs measure. When $k<\Delta/\ln{\Delta}$, it is straightforward to show that reconstruction is possible and hence the measure is not extremal. We prove that for $C>1$ and $k =C\Delta/\ln{\Delta}$, that the Gibbs measure is extremal in a strong sense: with high probability over the colorings of the leaves the influence at the root decays exponentially fast with the depth of the tree. Closely related results were also proven recently by Sly. The above strong form of extremality implies that a local Markov chain that updates constant sized blocks has inverse linear entropy constant and hence $O(N\log N)$ mixing time where $N$ is the number of vertices of the tree.
[ { "version": "v1", "created": "Fri, 23 Nov 2007 03:12:09 GMT" }, { "version": "v2", "created": "Tue, 3 Jun 2008 16:22:22 GMT" }, { "version": "v3", "created": "Sun, 29 Nov 2009 17:34:36 GMT" } ]
2011-07-28T00:00:00
[ [ "Bhatnagar", "Nayantara", "" ], [ "Vera", "Juan", "" ], [ "Vigoda", "Eric", "" ], [ "Weitz", "Dror", "" ] ]
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711.3665
Akira Yoshioka
Hideki Omori, Yoshiaki Maeda, Naoya Miyazaki, Akira Yoshioka
Geometric objects in an approach to quantum geometry
null
Progress in Mathematics, vol 252 (2007)
null
null
math.QA math.DG
null
Ideas from deformation quantization applied to algebras with one generator lead to methods to treat a nonlinear flat connection. It provides us elements of algebras to be parallel sections. The moduli space of the parallel sections is studied as an example of bundle-like objects with discordant (sogo) transition functions, which suggests us to treat movable branching singularities.
[ { "version": "v1", "created": "Fri, 23 Nov 2007 04:00:33 GMT" } ]
2007-11-26T00:00:00
[ [ "Omori", "Hideki", "" ], [ "Maeda", "Yoshiaki", "" ], [ "Miyazaki", "Naoya", "" ], [ "Yoshioka", "Akira", "" ] ]
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711.3666
Beixiang Fang
Gui-Qiang Chen (Northwestern University), Beixiang Fang (Shanghai Jiaotong University)
Stability of Transonic Shock-Fronts in Three-Dimensional Conical Steady Potential Flow past a Perturbed Cone
33 pages, 3 figures
Discrete Contin.Dyn.Syst. 23(1-2) (2009) 85-114
10.3934/dcds.2009.23.85
null
math.AP math-ph math.MP
null
For an upstream supersonic flow past a straight-sided cone in $\R^3$ whose vertex angle is less than the critical angle, a transonic (supersonic-subsonic) shock-front attached to the cone vertex can be formed in the flow. In this paper we analyze the stability of transonic shock-fronts in three-dimensional steady potential flow past a perturbed cone. We establish that the self-similar transonic shock-front solution is conditionally stable in structure with respect to the conical perturbation of the cone boundary and the upstream flow in appropriate function spaces. In particular, it is proved that the slope of the shock-front tends asymptotically to the slope of the unperturbed self-similar shock-front downstream at infinity.
[ { "version": "v1", "created": "Fri, 23 Nov 2007 04:15:12 GMT" } ]
2016-03-15T00:00:00
[ [ "Chen", "Gui-Qiang", "", "Northwestern University" ], [ "Fang", "Beixiang", "", "Shanghai\n Jiaotong University" ] ]
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711.3667
J. A. Lopez
J. Meaburn, J. A. L\'opez and M. G. Richer
Optical line profiles of the Helix planetary nebula (NGC 7293) to large radii
14 pages, 7 figures, MNRAS in press
null
10.1111/j.1365-2966.2007.12710.x
null
astro-ph
null
New, very long (25'), cuts of spatially resolved profiles of the Halpha and [N II] optical emission lines have been obtained over the face of the Helix planetary nebula, NGC 7293. These directions were chosen to supplement previous similar, though shorter, cuts as well as crossing interesting phenomena in this nebular envelope. In particular one new cut crosses the extremes of the proposed CO J=2-1 emitting outer "torus" shown by Huggins and his co-workers to be nearly orthogonal to its inner counterpart. The second new cut crosses the extensive outer filamentary arcs on either side of the bright nebular core. It is shown that NGC 7293 is composed of multiple bipolar outflows along different axes. Hubble-type outflows over a dynamical timescale of 11,000 years are shown to be occurring for all the phenomena from the smallest He II emitting core out to the largest outer filamentary structure. All must then have been ejected over a short timescale but with a range of ejection velocities
[ { "version": "v1", "created": "Fri, 23 Nov 2007 04:21:10 GMT" } ]
2009-11-13T00:00:00
[ [ "Meaburn", "J.", "" ], [ "López", "J. A.", "" ], [ "Richer", "M. G.", "" ] ]
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711.3668
Akira Yoshioka
Hideki Omori, Yoshiaki Maeda, Naoya Miyazaki, Akira Yoshioka
Star exponential functions as two-valued elements
null
Progress in Mathematics, vol 232 (2005)
null
null
math.QA
null
We propose a relatively new notion of two-valued elements, which arises naturally in constructing the star exponential functions of the quad-ratics in the Weyl algebra over the complex number field. This notion enables us to describe the group like objects of the set of star exponential functions of quadratics in the Weyl algebra.
[ { "version": "v1", "created": "Fri, 23 Nov 2007 04:24:10 GMT" } ]
2007-11-26T00:00:00
[ [ "Omori", "Hideki", "" ], [ "Maeda", "Yoshiaki", "" ], [ "Miyazaki", "Naoya", "" ], [ "Yoshioka", "Akira", "" ] ]
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711.3669
Yemon Choi
Yemon Choi
Simplicial cohomology of augmentation ideals in ${\ell}^1(G)$
14pp, uses Paul Taylor's diagrams.sty macros. v3: typos caught and some minor corrections/clarifications of terminology. This is not the final version, which will appear in Proc. Edinburgh Math. Soc
Proc. Edinburgh Math. Soc. 53 (2010), no. 1, 97--109.
10.1017/S0013091508000060
null
math.FA math.GR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Let $G$ be a discrete group. We give a decomposition theorem for the Hochschild cohomology of $\ell^1(G)$ with coefficients in certain $G$-modules. Using this we show that if $G$ is commutative-transitive, the canonical inclusion of bounded cohomology of $G$ into simplicial cohomology of $\ell^1(G)$ is an isomorphism.
[ { "version": "v1", "created": "Fri, 23 Nov 2007 04:43:02 GMT" }, { "version": "v2", "created": "Tue, 8 Jan 2008 22:07:26 GMT" }, { "version": "v3", "created": "Thu, 14 Aug 2008 23:01:03 GMT" } ]
2010-01-16T00:00:00
[ [ "Choi", "Yemon", "" ] ]
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711.367
Baier
V. N. Baier and V. M. Katkov
Opportunity to study the LPM effect in oriented crystal at GeV energy
16 pages, 3 figures
Phys.Lett.A372:2904-2910,2008
10.1016/j.physleta.2007.12.033
null
hep-ph
null
The spectral distribution of electron-positron pair created by photon and the spectral distribution of photons radiated from high-energy electron in an oriented single crystal is calculated using the method which permits inseparable consideration both of the coherent and incoherent mechanisms of two relevant processes. The method includes the action of field of axis (or plane) as well as the multiple scattering of radiating electron or particles of the created pair (the Landau-Pomeranchuk-Migdal (LPM) effect). The influence of scattering on the coherent mechanism and the influence of field on the incoherent mechanism are analyzed. In tungsten, axis $<111>$ for the pair creation process at temperature T= 100 K the LPM effect attains 8 % at photon energy 5 GeV and for the radiation process at T= 293 K the LPM effect reaches 6 % at electron energy 10 GeV.
[ { "version": "v1", "created": "Fri, 23 Nov 2007 06:04:41 GMT" } ]
2008-11-26T00:00:00
[ [ "Baier", "V. N.", "" ], [ "Katkov", "V. M.", "" ] ]
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711.3671
RongGang Ping
Ping Rong-Gang, and F. A. Harris, for BES collaboration
Experimental charmonium decay results from BES
4 pages, 1 figure, for CHARM2007
ECONF C070805:15,2007
null
null
hep-ex
null
Based on 14 million psi(2S) and 58 million J/psi events collected by the BESII detector, the leptonic decay of psi(2S) into $\tau^+\tau^-$, psi(2S) multi-body decays, chi_cJ decays, and J/psi hadronic decays are studied, and the branching fractions of these decays are reported. These results may shed light on the understanding of QCD.
[ { "version": "v1", "created": "Fri, 23 Nov 2007 06:33:10 GMT" }, { "version": "v2", "created": "Fri, 30 Nov 2007 01:15:03 GMT" } ]
2011-06-15T00:00:00
[ [ "Rong-Gang", "Ping", "" ], [ "Harris", "F. A.", "" ], [ "collaboration", "for BES", "" ] ]
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711.3672
Sebastien Tixeuil
St\'ephane Devismes (LRI), S\'ebastien Tixeuil (INRIA Futurs, LIP6), Masafumi Yamashita (TCSG)
Weak vs. Self vs. Probabilistic Stabilization
null
null
null
null
cs.DC cs.DS cs.NI
null
Self-stabilization is a strong property that guarantees that a network always resume correct behavior starting from an arbitrary initial state. Weaker guarantees have later been introduced to cope with impossibility results: probabilistic stabilization only gives probabilistic convergence to a correct behavior. Also, weak stabilization only gives the possibility of convergence. In this paper, we investigate the relative power of weak, self, and probabilistic stabilization, with respect to the set of problems that can be solved. We formally prove that in that sense, weak stabilization is strictly stronger that self-stabilization. Also, we refine previous results on weak stabilization to prove that, for practical schedule instances, a deterministic weak-stabilizing protocol can be turned into a probabilistic self-stabilizing one. This latter result hints at more practical use of weak-stabilization, as such algorthms are easier to design and prove than their (probabilistic) self-stabilizing counterparts.
[ { "version": "v1", "created": "Fri, 23 Nov 2007 07:17:25 GMT" }, { "version": "v2", "created": "Mon, 26 Nov 2007 11:08:34 GMT" } ]
2009-09-29T00:00:00
[ [ "Devismes", "Stéphane", "", "LRI" ], [ "Tixeuil", "Sébastien", "", "INRIA Futurs, LIP6" ], [ "Yamashita", "Masafumi", "", "TCSG" ] ]
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711.3673
Ettore Vicari
Pasquale Calabrese, Andrea Pelissetto, Ettore Vicari
Static and dynamic structure factors in three-dimensional randomly diluted Ising models
43 pages
Phys. Rev. E 77 (2008) 021126
10.1103/PhysRevE.77.021126
null
cond-mat.dis-nn cond-mat.stat-mech
null
We consider the three-dimensional randomly diluted Ising model and study the critical behavior of the static and dynamic spin-spin correlation functions (static and dynamic structure factors) at the paramagnetic-ferromagnetic transition in the high-temperature phase. We consider a purely relaxational dynamics without conservation laws, the so-called model A. We present Monte Carlo simulations and perturbative field-theoretical calculations. While the critical behavior of the static structure factor is quite similar to that occurring in pure Ising systems, the dynamic structure factor shows a substantially different critical behavior. In particular, the dynamic correlation function shows a large-time decay rate which is momentum independent. This effect is not related to the presence of the Griffiths tail, which is expected to be irrelevant in the critical limit, but rather to the breaking of translational invariance, which occurs for any sample and which, at the critical point, is not recovered even after the disorder average.
[ { "version": "v1", "created": "Fri, 23 Nov 2007 07:42:17 GMT" }, { "version": "v2", "created": "Thu, 28 Feb 2008 10:51:07 GMT" } ]
2009-11-13T00:00:00
[ [ "Calabrese", "Pasquale", "" ], [ "Pelissetto", "Andrea", "" ], [ "Vicari", "Ettore", "" ] ]
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711.3674
Wei Biao Wu
Wei Biao Wu
Strong invariance principles for dependent random variables
Published in at http://dx.doi.org/10.1214/009117907000000060 the Annals of Probability (http://www.imstat.org/aop/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Annals of Probability 2007, Vol. 35, No. 6, 2294-2320
10.1214/009117907000000060
IMS-AOP-AOP320
math.PR
null
We establish strong invariance principles for sums of stationary and ergodic processes with nearly optimal bounds. Applications to linear and some nonlinear processes are discussed. Strong laws of large numbers and laws of the iterated logarithm are also obtained under easily verifiable conditions.
[ { "version": "v1", "created": "Fri, 23 Nov 2007 07:44:05 GMT" } ]
2011-11-10T00:00:00
[ [ "Wu", "Wei Biao", "" ] ]
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711.3675
Yong Wang
Yong Wang, Bao-Gang Hu
Derivations of Normalized Mutual Information in Binary Classifications
8 pages, 8 figures, and 2 tables
null
null
null
cs.LG cs.IT math.IT
null
This correspondence studies the basic problem of classifications - how to evaluate different classifiers. Although the conventional performance indexes, such as accuracy, are commonly used in classifier selection or evaluation, information-based criteria, such as mutual information, are becoming popular in feature/model selections. In this work, we propose to assess classifiers in terms of normalized mutual information (NI), which is novel and well defined in a compact range for classifier evaluation. We derive close-form relations of normalized mutual information with respect to accuracy, precision, and recall in binary classifications. By exploring the relations among them, we reveal that NI is actually a set of nonlinear functions, with a concordant power-exponent form, to each performance index. The relations can also be expressed with respect to precision and recall, or to false alarm and hitting rate (recall).
[ { "version": "v1", "created": "Fri, 23 Nov 2007 07:45:52 GMT" } ]
2007-11-26T00:00:00
[ [ "Wang", "Yong", "" ], [ "Hu", "Bao-Gang", "" ] ]
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711.3676
Alvaro Perales Eceiza
Alvaro Perales and Guifre Vidal
Entanglement growth and simulation efficiency in one-dimensional quantum lattice systems
6 pages, 5 figures
Phys. Rev A 78, 042337 (2008)
10.1103/PhysRevA.78.042337
null
cond-mat.str-el quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the evolution of one-dimensional quantum lattice systems when the ground state is perturbed by altering one site in the middle of the chain. For a large class of models, we observe a similar pattern of entanglement growth during the evolution, characterized by a moderate increase of significant Schmidt coefficients in all relevant bipartite decompositions of the state. As a result, the evolution can be accurately described by a matrix product state and efficiently simulated using the time-evolving block decimation algorithm.
[ { "version": "v1", "created": "Fri, 23 Nov 2007 08:09:17 GMT" }, { "version": "v2", "created": "Mon, 3 Nov 2008 08:59:17 GMT" } ]
2009-11-13T00:00:00
[ [ "Perales", "Alvaro", "" ], [ "Vidal", "Guifre", "" ] ]
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711.3677
Xueliang Li
Xueliang Li, Yan Liu
Nonexistence of triples of nonisomorphic connected graphs with isomorphic connected $P_3$-graphs
9 pages
null
null
null
math.CO
null
In the paper "Broersma and Hoede, {\it Path graphs}, J. Graph Theory {\bf 13} (1989) 427-444", the authors proposed a problem whether there is a triple of mutually nonisomorphic connected graphs which have an isomorphic connected $P_3$-graph. For a long time, this problem remains unanswered. In this paper, we give it a negative answer that there is no such triple, and thus completely solve this problem.
[ { "version": "v1", "created": "Fri, 23 Nov 2007 08:18:50 GMT" } ]
2007-11-26T00:00:00
[ [ "Li", "Xueliang", "" ], [ "Liu", "Yan", "" ] ]
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711.3678
Dmitrii Zinoviev
Yuval Z. Flicker and Dmitrii Zinoviev
Twisted character of a small representation
This paper has been withdrawn
Int. J. of Number Theory, Vol. 2, No. 3, (2006) P. 329--350
null
null
math.RT math.NT
null
This paper has been withdrawn by the author as it has already been submitted under the title "Twisted character of a small Representation of GL(4)".
[ { "version": "v1", "created": "Fri, 23 Nov 2007 08:47:30 GMT" }, { "version": "v2", "created": "Wed, 28 Nov 2007 08:51:48 GMT" } ]
2007-11-28T00:00:00
[ [ "Flicker", "Yuval Z.", "" ], [ "Zinoviev", "Dmitrii", "" ] ]
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711.3679
Liu Hong
Liu Hong, Jinzhi Lei
Scaling Law for Radius of Gyration and Its Dependence on Hydrophobicity
7 pages, 8 figures
null
null
null
physics.bio-ph physics.chem-ph
null
Scaling law for geometrical and dynamical quantities of biological molecules is an interesting topic. According to Flory's theory, a power law between radius of gyration and the length of homopolymer chain is found, with exponent 3/5 for good solvent and 1/3 for poor solvent. For protein in physiological condition, a solvent condition in between, a power law with exponent ~2/5 is obtained. In this paper, we present a unified formula to cover all above cases. It shows that the scaling exponents are generally correlated with fractal dimension of a chain under certain solvent condition. While applying our formula to protein, the fractal dimension is found to depend on its hydrophobicity. By turning a physical process-varying hydrophobicity of a chain by amino acid mutation, to an equivalent chemical process-varying polarity of solvent by adding polar or nonpolar molecules, we successfully deprive this relation, with reasonable agreement to statistical data. And it will be helpful for protein structure prediction. Our results indicate that the protein may share the same basic principle with homopolymer, despite its specificity as a heteropolymer.
[ { "version": "v1", "created": "Fri, 23 Nov 2007 08:49:16 GMT" } ]
2007-11-26T00:00:00
[ [ "Hong", "Liu", "" ], [ "Lei", "Jinzhi", "" ] ]
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711.368
Konstantin Gusliyenko
Konstantin Yu. Guslienko, Jun-Young Lee, and Sang-Koog Kim
Dynamics of magnetic topological solitons in soft magnetic nanostripes
14 pages, 3 figures
null
null
null
nlin.PS
null
The motions of domain walls driven by magnetic field in soft magnetic nanostripes were calculated. The domain walls reveal steady motions in the low fields and oscillations of their internal structure above a critical field. A developed soliton model of the walls explains its dynamics by the motions of a limited number of magnetic topological solitons such as vortex and antivortex. We predict the reduced wall velocity and critical field in the low-field regime, and increased wall-oscillation frequency in nanostripes, compared to 1D Walker solution for bulk magnets. The critical field and velocity are determined by the nanostripe sizes, whereas the oscillation frequency depends only on the field strength.
[ { "version": "v1", "created": "Fri, 23 Nov 2007 08:58:23 GMT" } ]
2007-11-26T00:00:00
[ [ "Guslienko", "Konstantin Yu.", "" ], [ "Lee", "Jun-Young", "" ], [ "Kim", "Sang-Koog", "" ] ]
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711.3681
Kirill Samokhin
K. V. Samokhin and V. P. Mineev
Gap structure in noncentrosymmetric superconductors
9 pages; minor corrections, published version
Phys. Rev. B 77, 104520 (2008)
10.1103/PhysRevB.77.104520
null
cond-mat.supr-con
null
Gap structure in noncentrosymmetric superconductors with spin-orbit band splitting is studied using a microscopic model of pairing mediated by phonons and/or spin fluctuations. The general form of pairing interaction in the band representation is derived, which includes both the intraband and interband pairing terms. In the case of isotropic interaction (in particular, for a BCS-contact interaction), the interband pairing terms vanish identically at any magnitude of the band splitting. The effects of pairing interaction anisotropy are analyzed in detail for a metal of cubic symmetry with strong spin-orbit coupling. It is shown that if phonons are dominant then the gaps in two bands are isotropic, nodeless, and have in general different amplitudes. Applications to the Li_2(Pd_{1-x},Pt_x)_3B family of noncentrosymmetric superconductors are discussed.
[ { "version": "v1", "created": "Fri, 23 Nov 2007 15:40:52 GMT" }, { "version": "v2", "created": "Tue, 15 Jan 2008 19:18:05 GMT" }, { "version": "v3", "created": "Wed, 19 Mar 2008 16:00:49 GMT" } ]
2009-11-13T00:00:00
[ [ "Samokhin", "K. V.", "" ], [ "Mineev", "V. P.", "" ] ]
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711.3682
Moulin Emmanuel
H.E.S.S. Collaboration: E. Moulin, C. Farnier, J.-F. Glicenstein, A. Jacholkowska, L. Rolland, M. Vivier
Search for a Dark Matter annihilation signal from the Sagittarius dwarf galaxy with H.E.S.S
4 pages, 2 figures, 1 table; To appear in the Proceedings of the 30th ICRC (Merida, Mexico)
null
null
null
astro-ph
null
Dwarf Spheroidal galaxies are amongst the best targets to search for a Dark Matter annihilation signal. The annihilation of WIMPs in the center of Sagittarius dwarf spheroidal (Sgr dSph) galaxy would produce high energy gamma-rays in the final state. Observations carried out with the H.E.S.S. array of Imaging Atmospheric Cherenkov telescopes are presented. A careful modelling of the Dark Matter halo profile of Sgr dwarf was performed using latest measurements on its structural parameters. Constraints on the velocity-weighted cross section of Dark Matter particles are derived in the framework of Supersymmetric and Kaluza-Klein models.
[ { "version": "v1", "created": "Fri, 23 Nov 2007 09:18:51 GMT" } ]
2012-08-27T00:00:00
[ [ "Collaboration", "H. E. S. S.", "" ], [ ":", "", "" ], [ "Moulin", "E.", "" ], [ "Farnier", "C.", "" ], [ "Glicenstein", "J. -F.", "" ], [ "Jacholkowska", "A.", "" ], [ "Rolland", "L.", "" ], [ "Vivier", "M.", "" ] ]
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711.3683
Vincent Poireau
V. Poireau
Charm Spectroscopy at BaBar
8 pages, to be published in the proceedings of the XII International Conference on Hadron Spectroscopy held at INFN, Frascati, Italy between October 8-13, 2007
null
null
null
hep-ex
null
We present a mini-review on charm spectroscopy at the BaBar experiment. We first report on the $c\bar{s}$ meson spectrum, and present precise measurements of the $D_{s1}(2536)$ meson as well as the properties of the many new states discovered since 2003 ($D_{s0}^*(2317)$, $D_{s1}(2460)$, $D_{sJ}^*(2860)$, and $D_{sJ}(2700)$ mesons). We then discuss about charmed baryons observed recently in the BaBar experiment: $\Omega_c^0$ and $\Omega_c^{*0}$ $css$ baryons, $\Lambda_c(2940)^+$ $udc$ baryon and the $\Xi_c$ $usc/dsc$ baryons.
[ { "version": "v1", "created": "Fri, 23 Nov 2007 09:24:01 GMT" } ]
2007-11-26T00:00:00
[ [ "Poireau", "V.", "" ] ]
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711.3684
M. T. Yamashita
M. T. Yamashita, T. Frederico and L. Tomio
Comment on "Efimov States and their Fano Resonances in a Neutron-Rich Nucleus"
To be published in PRL
Phys.Rev.Lett.99:269201,2007
10.1103/PhysRevLett.99.269201
null
nucl-th
null
By introducing a mass asymmetry in a non-Borromean three-body system, without changing the energy relations, the virtual state pole cannot move from the negative real axis of the complex energy plane (with nonzero width) and become a resonance, because the analytical structure of the unitarity cuts remains the same.
[ { "version": "v1", "created": "Fri, 23 Nov 2007 20:01:16 GMT" } ]
2008-11-26T00:00:00
[ [ "Yamashita", "M. T.", "" ], [ "Frederico", "T.", "" ], [ "Tomio", "L.", "" ] ]
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711.3685
Guendelman Eduardo I
E.I. Guendelman
Continuous Axion Photon Duality and its Consequences
7 pages, Latex, pacs:11.30.Fs, 14.80.Mz, 14.70.Bh
Mod.Phys.Lett.A23:191-196,2008
10.1142/S0217732308026297
null
hep-th
null
The axion photon system in an external magnetic field, when for example considered with the geometry of the experiments exploring axion photon mixing, displays a continuous axion-photon duality symmetry in the limit the axion mass is neglected. The conservation law that follows from this symmetry is obtained. The magnetic field interaction is seen to be equivalent to first order to the interaction of a complex charged field with an external electric potential, where this ficticious "electric potential" is proportional to the external magnetic field. This allows to solve for the scattering amplitudes using already known scalar QED results. It is argued that in more generic conditions (not just related to these experiments) axion-photon condensation could be obtained for high magnetic fields. Finally an exact constraint originating fromthe current conservation on the amplitudes of reflected and transmited waves is obtained.
[ { "version": "v1", "created": "Fri, 23 Nov 2007 09:35:47 GMT" } ]
2008-11-26T00:00:00
[ [ "Guendelman", "E. I.", "" ] ]
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711.3686
Alexander Fribergh
G\'erard Ben Arous (CIMS), Alexander Fribergh (CIMS), Nina Gantert, Alan Hammond
Biased random walks on a Galton-Watson tree with leaves
49 pages, 2 figures. To appear in Ann. Probab
null
null
null
math.PR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider a biased random walk $X_n$ on a Galton-Watson tree with leaves in the sub-ballistic regime. We prove that there exists an explicit constant $\gamma= \gamma(\beta) \in (0,1)$, depending on the bias $\beta$, such that $X_n$ is of order $n^{\gamma}$. Denoting $\Delta_n$ the hitting time of level $n$, we prove that $\Delta_n/n^{1/\gamma}$ is tight. Moreover we show that $\Delta_n/n^{1/\gamma}$ does not converge in law (at least for large values of $\beta$). We prove that along the sequences $n_{\lambda}(k)=\lfloor \lambda \beta^{\gamma k}\rfloor$, $\Delta_n/n^{1/\gamma}$ converges to certain infinitely divisible laws. Key tools for the proof are the classical Harris decomposition for Galton-Watson trees, a new variant of regeneration times and the careful analysis of triangular arrays of i.i.d. heavy-tailed random variables.
[ { "version": "v1", "created": "Fri, 23 Nov 2007 09:37:11 GMT" }, { "version": "v2", "created": "Tue, 11 Dec 2007 16:54:21 GMT" }, { "version": "v3", "created": "Mon, 20 Oct 2008 11:58:07 GMT" }, { "version": "v4", "created": "Wed, 17 Nov 2010 14:46:46 GMT" } ]
2010-11-18T00:00:00
[ [ "Arous", "Gérard Ben", "", "CIMS" ], [ "Fribergh", "Alexander", "", "CIMS" ], [ "Gantert", "Nina", "" ], [ "Hammond", "Alan", "" ] ]
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711.3687
Monika Meise Ph.D.
P. L. Davies, U. Gather, M. Meise, D. Mergel, T.Mildenberger
Residual-based localization and quantification of peaks in x-ray diffractograms
Published in at http://dx.doi.org/10.1214/08-AOAS181 the Annals of Applied Statistics (http://www.imstat.org/aoas/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Annals of Applied Statistics 2008, Vol. 2, No. 3, 861-886
10.1214/08-AOAS181
IMS-AOAS-AOAS181
stat.AP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider data consisting of photon counts of diffracted x-ray radiation as a function of the angle of diffraction. The problem is to determine the positions, powers and shapes of the relevant peaks. An additional difficulty is that the power of the peaks is to be measured from a baseline which itself must be identified. Most methods of de-noising data of this kind do not explicitly take into account the modality of the final estimate. The residual-based procedure we propose uses the so-called taut string method, which minimizes the number of peaks subject to a tube constraint on the integrated data. The baseline is identified by combining the result of the taut string with an estimate of the first derivative of the baseline obtained using a weighted smoothing spline. Finally, each individual peak is expressed as the finite sum of kernels chosen from a parametric family.
[ { "version": "v1", "created": "Fri, 23 Nov 2007 14:49:04 GMT" }, { "version": "v2", "created": "Wed, 7 May 2008 09:45:36 GMT" }, { "version": "v3", "created": "Tue, 11 Nov 2008 08:43:34 GMT" } ]
2008-11-11T00:00:00
[ [ "Davies", "P. L.", "" ], [ "Gather", "U.", "" ], [ "Meise", "M.", "" ], [ "Mergel", "D.", "" ], [ "Mildenberger", "T.", "" ] ]
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711.3688
Jean-Andre Marti
Jean-Andr\'e Marti (GTSI)
Regularity, Local and Microlocal Analysis in Theories of Generalized Functions
null
null
null
null
math.FA
null
We introduce a general context involving a presheaf A and a subpresheaf B of A. We show that all previously considered cases of local analysis of generalized functions (defined from duality or algebraic techniques) can be interpretated as the B-local analysis of sections of A. But the microlocal analysis of the sections of sheaves or presheaves under consideration is dissociated into a "frequential microlocal analysis " and into a "microlocal asymptotic analysis". The frequential microlocal analysis based on the Fourier transform leads to the study of propagation of singularities under only linear (including pseudodifferential) operators in the theories described here, but has been extended to some non linear cases in classical theories involving Sobolev techniques. The microlocal asymptotic analysis can inherit from the algebraic structure of B some good properties with respect to nonlinear operations.
[ { "version": "v1", "created": "Fri, 23 Nov 2007 09:39:18 GMT" } ]
2007-11-26T00:00:00
[ [ "Marti", "Jean-André", "", "GTSI" ] ]
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711.3689
Diederik Kruijssen
J. M. Diederik Kruijssen, Henny J. G. L. M. Lamers
The Age Distributions of Clusters and Field Stars in the Small Magellanic Cloud -- Implications for Star Formation Histories
2 pages, 1 figure, proceedings from the conference "Formation and Evolution of Galaxy Disks", Rome, October 1-5, 2007. Published in the series of the Astronomical Society of the Pacific, ASPC, 396, 149
Astronomical Society of the Pacific, ASPC, 396, 149
null
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Differences between the inferred star formation histories (SFHs) of star clusters and field stars seem to suggest distinct star formation processes for the two. The Small Magellanic Cloud (SMC) is an example of a galaxy where such a discrepancy is observed. We model the observed age distributions of the SMC clusters and field stars using a new population synthesis code, SPACE, that includes stellar evolution, infant mortality and cluster dissolution. We find that the two observed age distributions can be explained by a single SFH, thus eliminating the need to assume two separate mechanisms for star formation.
[ { "version": "v1", "created": "Fri, 23 Nov 2007 11:56:15 GMT" }, { "version": "v2", "created": "Fri, 30 Nov 2007 10:20:12 GMT" }, { "version": "v3", "created": "Fri, 27 Mar 2009 06:45:46 GMT" } ]
2009-03-27T00:00:00
[ [ "Kruijssen", "J. M. Diederik", "" ], [ "Lamers", "Henny J. G. L. M.", "" ] ]
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711.369
Vladimir Smolyar
I. V. Sharf, G. O. Sokhrannyi, A. V. Tykhonov, K. V. Yatkin, N. A. Podolyan, M. A. Deliyergiyev, V. D. Rusov
Mechanisms of proton-proton inelastic cross-section growth in multi-peripheral model within the framework of perturbation theory. Part 2
11 pages, 10 figures (v3: some inaccuracies corrected)
JMP, Vol.3 No.1, 2012, pp.16-27
10.4236/jmp.2012.31003
null
nucl-th
http://creativecommons.org/licenses/by/3.0/
We demonstrate a new technique for calculating proton-proton inelastic cross-section, which allows one by application of the Laplace' method replace the integrand in the integral for the scattering amplitude in the vicinity of the maximum point by expression of Gaussian type. This in turn, allows one to overcome the computational difficulties for the calculation of the integrals expressing the cross section to sufficiently large numbers of particles. We have managed to overcome these problems in calculating the proton-proton inelastic cross-section for production (n \le 8) number of secondary particles in within the framework of \phi^3 model. As the result the obtained dependence of inelastic cross-section and total scattering cross-section on the energy \sqrt{s} are qualitative agrees with the experimental data. Such description of total cross-section behavior differs considerably from existing now description, where reggeons exchange with the intercept greater than unity is considered.
[ { "version": "v1", "created": "Fri, 23 Nov 2007 09:44:00 GMT" }, { "version": "v2", "created": "Wed, 26 Oct 2011 20:01:10 GMT" }, { "version": "v3", "created": "Wed, 22 Aug 2012 13:55:27 GMT" } ]
2012-10-17T00:00:00
[ [ "Sharf", "I. V.", "" ], [ "Sokhrannyi", "G. O.", "" ], [ "Tykhonov", "A. V.", "" ], [ "Yatkin", "K. V.", "" ], [ "Podolyan", "N. A.", "" ], [ "Deliyergiyev", "M. A.", "" ], [ "Rusov", "V. D.", "" ] ]
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711.3691
Eric Laporte
Olivier Blanc (IGM-LabInfo), Matthieu Constant (IGM-LabInfo), Eric Laporte (IGM-LabInfo)
Outilex, plate-forme logicielle de traitement de textes \'ecrits
null
Dans Verbum ex machina. Proceedings of TALN - Outilex, plate-forme logicielle de traitement de textes \'ecrits, Louvain : Belgique (2006)
null
null
cs.CL
null
The Outilex software platform, which will be made available to research, development and industry, comprises software components implementing all the fundamental operations of written text processing: processing without lexicons, exploitation of lexicons and grammars, language resource management. All data are structured in XML formats, and also in more compact formats, either readable or binary, whenever necessary; the required format converters are included in the platform; the grammar formats allow for combining statistical approaches with resource-based approaches. Manually constructed lexicons for French and English, originating from the LADL, and of substantial coverage, will be distributed with the platform under LGPL-LR license.
[ { "version": "v1", "created": "Fri, 23 Nov 2007 09:45:13 GMT" }, { "version": "v2", "created": "Tue, 27 Nov 2007 10:22:14 GMT" } ]
2007-11-27T00:00:00
[ [ "Blanc", "Olivier", "", "IGM-LabInfo" ], [ "Constant", "Matthieu", "", "IGM-LabInfo" ], [ "Laporte", "Eric", "", "IGM-LabInfo" ] ]
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711.3692
Vladimir Shevelev
Vladimir Shevelev
A Short Proof of a Known Relation for Consecutive Power Sums
4 pages
null
null
null
math.CA math.NT
null
We give a new short proof of the most simple relation between consecutive power sums of the first m positive integers.
[ { "version": "v1", "created": "Fri, 23 Nov 2007 09:46:32 GMT" } ]
2007-11-26T00:00:00
[ [ "Shevelev", "Vladimir", "" ] ]
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711.3693
Paola Di Matteo
P. Di Matteo, F. Combes, A.-L. Melchior, B. Semelin
Old stellar counter-rotating components in elliptical-spiral mergers: exploring the GalMer database
2 pages, 2 figures. To appear in the proceedings of "Formation and Evolution of Galaxy Disks" (J. G. Funes, and E. M. Corsini eds)
null
null
null
astro-ph
null
We investigate, by means of numerical simulations, the kinematics of elliptical-spiral merger remnants. Counterrotation can appear both in coplanar and in non-coplanar retrograde mergers, and it is mostly associated to the presence of a disk component, which preserves part of its initial spin. In turn, the external regions of the two interacting galaxies acquire part of the orbital angular momentum, due to the action of tidal forces.
[ { "version": "v1", "created": "Fri, 23 Nov 2007 09:51:37 GMT" } ]
2007-11-26T00:00:00
[ [ "Di Matteo", "P.", "" ], [ "Combes", "F.", "" ], [ "Melchior", "A. -L.", "" ], [ "Semelin", "B.", "" ] ]
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711.3694
Silvia Faggian PhD
Silvia Faggian
Maximum Principle for Linear-Convex Boundary Control Problems applied to Optimal Investment with Vintage Capital
null
null
null
null
math.OC
null
The paper concerns the study of the Pontryagin Maximum Principle for an infinite dimensional and infinite horizon boundary control problem for linear partial differential equations. The optimal control model has already been studied both in finite and infinite horizon with Dynamic Programming methods in a series of papers by the same author, or by Faggian and Gozzi. Necessary and sufficient optimality conditions for open loop controls are established. Moreover the co-state variable is shown to coincide with the spatial gradient of the value function evaluated along the trajectory of the system, creating a parallel between Maximum Principle and Dynamic Programming. The abstract model applies, as recalled in one of the first sections, to optimal investment with vintage capital.
[ { "version": "v1", "created": "Fri, 23 Nov 2007 20:11:21 GMT" } ]
2007-11-26T00:00:00
[ [ "Faggian", "Silvia", "" ] ]
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711.3695
Lisa Hall
Jonathan D. Evans, Lisa M.H. Hall, Philippe Caillol
Standard Cosmological Evolution in a Wide Range of f(R) Models
15 pages, 6 figures (1 new figure), new version considers both CDTT and mCDTT models. References added. Accepted by Phys Rev D
Phys.Rev.D77:083514,2008
10.1103/PhysRevD.77.083514
null
astro-ph
null
Using techniques from singular perturbation theory, we explicitly calculate the cosmological evolution in a class of modified gravity models. By considering the (m)CDTT model, which aims to explain the current acceleration of the universe with a modification of gravity, we show that Einstein evolution can be recovered for most of cosmic history in at least one f(R) model. We show that a standard epoch of matter domination can be obtained in the mCDTT model, providing a sufficiently long epoch to satisfy observations. We note that the additional inverse term will not significantly alter standard evolution until today and that the solution lies well within present constraints from Big Bang Nucleosynthesis. For the CDTT model, we analyse the ``recent radiation epoch'' behaviour (a \propto t^{1/2}) found by previous authors. We finally generalise our findings to the class of inverse power-law models. Even in this class of models, we expect a standard cosmological evolution, with a sufficient matter domination era, although the sign of the additional term is crucial.
[ { "version": "v1", "created": "Fri, 23 Nov 2007 10:10:15 GMT" }, { "version": "v2", "created": "Wed, 12 Mar 2008 15:42:34 GMT" } ]
2009-06-23T00:00:00
[ [ "Evans", "Jonathan D.", "" ], [ "Hall", "Lisa M. H.", "" ], [ "Caillol", "Philippe", "" ] ]
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711.3696
Holger Stiele
H. Stiele, W. Pietsch, F. Haberl (for the XMM-Newton M 31 large program collaboration)
A deep XMM-Newton survey of M 31
5 pages, 5 figures, to be published in the proceedings of the ESAC workshop "X-rays from Nearby Galaxies"
null
null
null
astro-ph
null
The deep homogeneous survey of the large Local-Group spiral galaxy M 31 is a milestone project for X-ray astronomy, as it allows a detailed X-ray inventory of an archetypal low-star-formation-rate galaxy like our own. We present first results of the deep XMM-Newton survey, which covers the entire D 25 ellipse. Information from different X-ray energy bands are combined in an X-ray colour image of M 31. In the first 15 observations we found about 1000 sources, the full survey will yield about 2000 X-ray sources. Sources will be classified using hardness ratios, extent, high quality spectra and time variability. In addition the sources will be correlated with catalogues in optical, infra-red and radio wavelengths. Our goal is to study M 31 X-ray binaries and globular cluster sources, supersoft sources, supernova remnants and the hot interstellar medium and separate them from foreground stars and background objects.
[ { "version": "v1", "created": "Fri, 23 Nov 2007 10:25:47 GMT" } ]
2019-08-14T00:00:00
[ [ "Stiele", "H.", "", "for the XMM-Newton M 31 large\n program collaboration" ], [ "Pietsch", "W.", "", "for the XMM-Newton M 31 large\n program collaboration" ], [ "Haberl", "F.", "", "for the XMM-Newton M 31 large\n program collaboration" ] ]
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711.3697
Patrick Lenz
P. Lenz, A. A. Pamyatnykh, M. Breger, V. Antoci
An asteroseismic study of the Delta Scuti star 44 Tau
9 pages, 15 figures, 2 tables, accepted for publication in A&A
null
10.1051/0004-6361:20078376
null
astro-ph
null
In this paper we investigate theoretical pulsation models for the delta Scuti star 44 Tau. The star was monitored during several multisite campaigns which confirmed the presence of radial and nonradial oscillations. Moreover, its exceptionally low rotational velocity makes 44 Tau particulary interesting for an asteroseismic study. Due to the measured log g value of 3.6 +/- 0.1, main sequence and post-main sequence models have to be considered. We perform mode identification based on photometric and spectroscopic data. A nonadiabatic pulsation code is used to compute models that fit the identified modes. The influence of different opacity tables and element mixtures on the results is tested. The observed frequencies of 44 Tau can be fitted in both the main sequence and the post-main sequence evolutionary stage. Post-main sequence models are preferable as they fulfill almost all observational constraints (fit of observed frequencies, position in the HRD and instability range). These models can be obtained with normal chemical composition which is in agreement with recent spectroscopic measurements. The efficiency of envelope convection (in the framework of the mixing-length theory) is predicted to be very low in 44 Tau. We show that the results are sensitive to the choice between the OPAL and OP opacities. While the pulsation models of 44 Tau computed with OP opacities are considerably too cool and too faint, the use of OPAL opacities results in models within the expected temperature and luminosity range.
[ { "version": "v1", "created": "Fri, 23 Nov 2007 10:12:16 GMT" } ]
2009-11-13T00:00:00
[ [ "Lenz", "P.", "" ], [ "Pamyatnykh", "A. A.", "" ], [ "Breger", "M.", "" ], [ "Antoci", "V.", "" ] ]
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711.3698
Stefano Pasquero
Stefano Pasquero
Some results on ideal impacts of billiard balls
9 pages
null
null
null
physics.class-ph
null
We analyze the impact of two equal billiard balls in three ideal situations: when the balls freely slide on the plane of the billiard, when they roll without sliding and when one of them freely slides and the other rolls. In all the cases we suppose that the contact between the balls is smooth. We base our analysis on some recent general theoretical results on ideal impacts obtained by means of Differential Geometric Impulsive Mechanics. We use symbolic computation software to solve the computational difficulties arising by the high number of degrees of freedom of the system. Some particular but significative impacts, with opportunely assigned left velocities and positions of the balls, are analyzed in details. The results admit easy interpretations that turn out to be in good agreement with the reasonable forecasts and the behaviours of real systems.
[ { "version": "v1", "created": "Fri, 23 Nov 2007 10:08:53 GMT" } ]
2007-11-26T00:00:00
[ [ "Pasquero", "Stefano", "" ] ]
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711.3699
Choon-Lin Ho
Choon-Lin Ho
Prepotential approach to exact and quasi-exact solvabilities
11 pages, no figures. New paragraphs added in the Introduction and Summary sections. New references added. Version to appear in Ann. Phys
null
10.1016/j.aop.2008.04.010
null
math-ph math.MP
null
Exact and quasi-exact solvabilities of the one-dimensional Schr\"odinger equation are discussed from a unified viewpoint based on the prepotential together with Bethe ansatz equations. This is a constructive approach which gives the potential as well as the eigenfunctions and eigenvalues simultaneously. The novel feature of the present work is the realization that both exact and quasi-exact solvabilities can be solely classified by two integers, the degrees of two polynomials which determine the change of variable and the zero-th order prepotential. Most of the well-known exactly and quasi-exactly solvable models, and many new quasi-exactly solvable ones, can be generated by appropriately choosing the two polynomials. This approach can be easily extended to the constructions of exactly and quasi-exactly solvable Dirac, Pauli, and Fokker-Planck equations.
[ { "version": "v1", "created": "Fri, 23 Nov 2007 10:23:43 GMT" }, { "version": "v2", "created": "Thu, 29 Nov 2007 21:02:09 GMT" }, { "version": "v3", "created": "Fri, 16 May 2008 17:05:21 GMT" } ]
2015-05-13T00:00:00
[ [ "Ho", "Choon-Lin", "" ] ]
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711.37
Ramin Golestanian
Ramin Golestanian and Armand Ajdari
Analytic results for the three-sphere swimmer at low Reynolds number
7 pages, 3 figures
Phys. Rev. E 77, 036308 (2008)
10.1103/PhysRevE.77.036308
null
cond-mat.soft cond-mat.stat-mech
null
The simple model of a low Reynolds number swimmer made from three spheres that are connected by two arms is considered in its general form and analyzed. The swimming velocity, force--velocity response, power consumption, and efficiency of the swimmer are calculated both for general deformations and also for specific model prescriptions. The role of noise and coherence in the stroke cycle is also discussed.
[ { "version": "v1", "created": "Fri, 23 Nov 2007 10:26:08 GMT" }, { "version": "v2", "created": "Wed, 19 Mar 2008 09:49:30 GMT" } ]
2009-11-13T00:00:00
[ [ "Golestanian", "Ramin", "" ], [ "Ajdari", "Armand", "" ] ]
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711.3701
Richard Herrmann
Richard Herrmann
q-deformed Lie algebras and fractional calculus
8 pages, 3 figures
Physica A 389 (2010) 4613--4622
10.1016/j.physa.2010.07.004
null
physics.gen-ph
null
Fractional calculus and q-deformed Lie algebras are closely related. Both concepts expand the scope of standard Lie algebras to describe generalized symmetries. For the fractional harmonic oscillator, the corresponding q-number is derived. It is shown, that the resulting energy spectrum is an appropriate tool e.g. to describe the ground state spectra of even-even nuclei. In addition, the equivalence of rotational and vibrational spectra for fractional q-deformed Lie algebras is shown and the $B_\alpha(E2)$ values for the fractional q-deformed symmetric rotor are calculated.
[ { "version": "v1", "created": "Fri, 23 Nov 2007 10:31:44 GMT" } ]
2010-08-19T00:00:00
[ [ "Herrmann", "Richard", "" ] ]
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711.3702
Daniel Errandonea
J. Ruiz-Fuertes, D. Errandonea, F. J. Manjon, D. Martinez-Garcia, A. Segura, V. V. Ursaki, and I. M. Tiginyanu
High-pressure effects on the optical-absorption edge of CdIn2S4, MgIn2S4, and MnIn2S4 thiospinels
18 pages, 3 figures
J. Appl. Phys. 103, 063710 (2008)
10.1063/1.2887992
null
cond-mat.mtrl-sci
null
The effect of pressure on the optical-absorption edge of CdIn2S4, MgIn2S4, and MnIn2S4 thiospinels at room temperature is investigated up to 20 GPa. The pressure dependence of their band-gaps has been analyzed using the Urbach rule. We have found that, within the pressure-range of stability of the low-pressure spinel phase, the band-gap of CdIn2S4 and MgIn2S4 exhibits a linear blue-shift with pressure, whereas the band-gap of MnIn2S4 exhibits a pronounced non-linear shift. In addition, an abrupt decrease of the band-gap energies occurs in the three compounds at pressures of 10 GPa, 8.5 GPa, and 7.2 GPa, respectively. Beyond these pressures, the optical-absorption edge red-shifts upon compression for the three studied thiospinels. All these results are discussed in terms of the electronic structure of each compound and their reported structural changes.
[ { "version": "v1", "created": "Fri, 23 Nov 2007 10:35:56 GMT" } ]
2008-06-02T00:00:00
[ [ "Ruiz-Fuertes", "J.", "" ], [ "Errandonea", "D.", "" ], [ "Manjon", "F. J.", "" ], [ "Martinez-Garcia", "D.", "" ], [ "Segura", "A.", "" ], [ "Ursaki", "V. V.", "" ], [ "Tiginyanu", "I. M.", "" ] ]
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711.3703
Francisco Martin Cabrera
J.C. Gonzalez-Davila, F. Martin Cabrera and M. Salvai
Harmonicity of sections of sphere bundles
22 pages
null
null
null
math.DG
null
We consider the energy functional on the space of sections of a sphere bundle over a Riemannian manifold (M, <,>) equipped with the Sasaki metric and we discuss the characterising condition for critical points. Likewise, we provide a useful method for computing the tension field in some particular situations. Such a method is shown to be adequate for many tensor fields defined on manifolds M equipped with a G-structure compatible with <,>. This leads to the construction of a lot of new examples of differential forms which are harmonic sections or determine a harmonic map from (M,<,>) into its sphere bundle.
[ { "version": "v1", "created": "Fri, 23 Nov 2007 10:40:29 GMT" } ]
2007-11-26T00:00:00
[ [ "Gonzalez-Davila", "J. C.", "" ], [ "Cabrera", "F. Martin", "" ], [ "Salvai", "M.", "" ] ]
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711.3704
Julien Meyer
Julien Meyer (LAB-Upc)
Acoustic Features and Perceptive Cues of Songs and Dialogues in Whistled Speech: Convergences with Sung Speech
null
Dans Proceedings of the International Symposium on Musical Acoustics 2007 - International Symposium on Musical Acoustics 2007, Barcelona : Espagne (2007)
null
null
physics.bio-ph
null
Whistled speech is a little studied local use of language shaped by several cultures of the world either for distant dialogues or for rendering traditional songs. This practice consists of an emulation of the voice thanks to a simple modulated pitch. It is therefore the result of a transformation of the vocal signal that implies simplifications in the frequency domain. The whistlers adapt their productions to the way each language combines the qualities of height perceived simultaneously by the human ear in the complex frequency spectrum of the spoken or sung voice (pitch, timbre). As a consequence, this practice underlines key acoustic cues for the intelligibility of the concerned languages. The present study provides an analysis of the acoustic and phonetic features selected by whistled speech in several traditions either in purely oral whistles (Spanish, Turkish, Mazatec) or in whistles produced with an instrument like a leaf (Akha, Hmong). It underlines the convergences with the strategies of the singing voice to reach the audience or to render the phonetic information carried by the vowel (tone, identity) and some aesthetic effects like ornamentation.
[ { "version": "v1", "created": "Fri, 23 Nov 2007 10:41:35 GMT" } ]
2007-11-26T00:00:00
[ [ "Meyer", "Julien", "", "LAB-Upc" ] ]
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711.3705
Mehmet Ozgur Oktel
R. O. Umucalilar, Hui Zhai, M. O. Oktel
Trapped Fermi Gases in Rotating Optical Lattices: Realization and Detection of the Topological Hofstadter Insulator
4 pages, 4 figures
Phys. Rev. Lett. 100, 070402 (2008)
10.1103/PhysRevLett.100.070402
null
cond-mat.mes-hall
null
We consider a gas of non-interacting spinless fermions in a rotating optical lattice and calculate the density profile of the gas in an external confinement potential. The density profile exhibits distinct plateaus, which correspond to gaps in the single particle spectrum known as the Hofstadter butterfly. The plateaus result from insulating behavior whenever the Fermi energy lies within a gap. We discuss the necessary conditions to realize the Hofstadter insulator in a cold atom setup and show how the quantized Hall conductance can be measured from density profiles using the St\v{r}eda formula.
[ { "version": "v1", "created": "Fri, 23 Nov 2007 10:48:54 GMT" } ]
2008-04-15T00:00:00
[ [ "Umucalilar", "R. O.", "" ], [ "Zhai", "Hui", "" ], [ "Oktel", "M. O.", "" ] ]
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711.3706
Gennady Makanin
G.S.Makanin
Poincare's Conjecture for three manifolds
null
null
null
null
math.GM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We prove Poincare's Conjecture that every simply connected, closed three-manifold is topologically equivalent to the three-sphere. The proof is founded on the algebraic formulation discovered by J. Stallings.
[ { "version": "v1", "created": "Fri, 23 Nov 2007 10:52:43 GMT" }, { "version": "v2", "created": "Thu, 14 Sep 2017 14:00:13 GMT" } ]
2017-09-15T00:00:00
[ [ "Makanin", "G. S.", "" ] ]
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711.3707
Yaar Solomon
Y. Solomon
The net created from the Penrose tiling is biLipschitz to the integer lattice
null
null
null
null
math.MG math.DS
null
A separated net is a set of points which is relatively dense and uniformly discrete (another name for a Delone set). We are dealing with tilings and separated nets in Euclidean spaces and with the question whether a given separated net is biLipschitz to the integer lattice. In this paper we show, as an answer to a question of Burago and Kleiner, that the net that is obtained form the Penrose tiling is biLipschitz to the integer lattice.
[ { "version": "v1", "created": "Fri, 23 Nov 2007 11:06:12 GMT" } ]
2007-11-26T00:00:00
[ [ "Solomon", "Y.", "" ] ]
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