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801.0673
Kevin Edmonds
A.A. Freeman, K.W. Edmonds, G. van der Laan, R.P. Campion, N.R.S. Farley, A.W. Rushforth, T.K. Johal, C.T. Foxon, B.L. Gallagher, A. Rogalev, and F. Wilhelm
Valence band orbital polarization in III-V ferromagnetic semiconductors
5 pages, 2 figures
null
10.1103/PhysRevB.77.073304
null
cond-mat.mtrl-sci cond-mat.mes-hall
null
The element-specific technique of x-ray magnetic circular dichroism (XMCD) is used to directly determine the magnitude and character of the valence band orbital magnetic moments in (III,Mn)As ferromagnetic semiconductors. A distinct dichroism is observed at the As K absorption edge, yielding an As 4p orbital magnetic moment of around -0.1 Bohr magnetons per valence band hole. This is strongly influenced by strain, indicating its crucial influence on the magnetic anisotropy. The dichroism at the Ga K edge is much weaker. The K edge XMCD signals for Mn and As both have positive sign, which indicates the important contribution of Mn 4p states to the Mn K edge spectra.
[ { "version": "v1", "created": "Fri, 4 Jan 2008 12:49:43 GMT" } ]
2009-11-13T00:00:00
[ [ "Freeman", "A. A.", "" ], [ "Edmonds", "K. W.", "" ], [ "van der Laan", "G.", "" ], [ "Campion", "R. P.", "" ], [ "Farley", "N. R. S.", "" ], [ "Rushforth", "A. W.", "" ], [ "Johal", "T. K.", "" ], [ "Foxon", "C. T.", "" ], [ "Gallagher", "B. L.", "" ], [ "Rogalev", "A.", "" ], [ "Wilhelm", "F.", "" ] ]
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801.0674
Griet C. Van de Steene
G.C. Van de Steene, T. Ueta, P.A.M.van Hoof, M. Reyniers, A.G. Ginsburg
Kinematics and H_2 morphology of the multipolar Post-AGB star IRAS 16594-4656
11 pages and 8 figures; A&A in press; the paper includig high resolution figures can be downloaded from http://homepage.oma.be/gsteene/publications.html
null
10.1051/0004-6361:20078880
null
astro-ph
null
context: The spectrum of IRAS 16594-4656 shows shock excited H_2 emission and collisionally excited emission lines such as[O I],[C I],and [Fe II]. aim: The goal is to determine the location of the H_2 and [Fe II] shock emission, to determine the shock velocities,and constrain the physical properties in the shock. methods: High resolution spectra of the H_2 1-0 S(1),H_2 2-1 S(1), [Fe II], and Pa$\beta$ emission lines were obtained with the near infrared spectrograph Phoenix on Gemini South. results: The position-velocity diagrams of H_2 1-0 S(1), H_2 2-1 S(1), and [Fe II] are presented. The H_2 and [Fe II] emission is spatially extended. The collisionally excited [O I] and [C I] optical emission lines have a similar double peaked profile compared to the extracted H_2 profile and appear to be produced in the same shock. They all indicate an expansion velocity of ~8 km/s and the presence of a neutral, very high density region with $n_{\rm e}$ about 3 x 10^6 to 5 x10^7 cm$^{-3}$. The [Fe II] emission however is single peaked. It has a gaussian FWHM of 30 km/s and a total width of 62 km/s at 1% of the peak. The Pa$\beta$ profile is even wider with a gaussian FWHM of 48 km/s and a total width of 75 km/s at 1% of the peak. conclusions: The H$_2$ emission is excited in a slow 5 to 20 km/s shock into dense material at the edge of the lobes, caused by the interaction of the AGB ejecta and the post-AGB wind. The 3D representation of the H_2 data shows a hollow structure with less H_2 emission in the equatorial region. The [Fe II] emission is not present in the lobes, but originates close to the central star in fast shocks in the post-AGB wind or in a disk. The Pa$\beta$ emission also appears to originate close to the star.
[ { "version": "v1", "created": "Fri, 4 Jan 2008 13:00:35 GMT" } ]
2009-11-13T00:00:00
[ [ "Van de Steene", "G. C.", "" ], [ "Ueta", "T.", "" ], [ "van Hoof", "P. A. M.", "" ], [ "Reyniers", "M.", "" ], [ "Ginsburg", "A. G.", "" ] ]
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801.0675
Matthias Neubert
Matthias Neubert (Univ. Mainz)
QCD Calculations of Decays of Heavy Flavor Hadrons
Invited plenary talk delivered at the 23rd International Symposium on Lepton and Photon Interactions at High Energy (Daegu, Korea, 13-18 August 2007)
null
null
MZ-TH/08-2
hep-ph
null
Precision tests of the Standard Model and searches for New Physics in the quark flavor sector depend on accurate theoretical calculations of decay rates and spectra for rare, flavor-changing processes. The theoretical status and recent developments of techniques allowing such calculations are reviewed. Special attention is paid to the calculation of the B->Xs+gamma branching ratio, the extraction of the b-quark mass from a fit to B->Xc+l+nu moments, and the determination of |V(ub)| from spectra in the inclusive decay B->Xu+l+nu. From a reanalysis of different inclusive distributions the updated average value |V(ub)|=(3.98+-0.15+-0.30)*10^{-3} is derived. Using only the theoretically cleanest channels, we obtain |V(ub)|=(3.70+-0.15+-0.28)*10^{-3}.
[ { "version": "v1", "created": "Fri, 4 Jan 2008 13:18:18 GMT" } ]
2008-01-07T00:00:00
[ [ "Neubert", "Matthias", "", "Univ. Mainz" ] ]
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801.0676
Gleb Oshanin
G. Oshanin
Fractional Brownian motion in presence of two fixed adsorbing boundaries
13 pages, submitted to J.Phys.A
null
null
null
cond-mat.stat-mech math.PR
null
We study the long-time asymptotics of the probability P_t that the Riemann-Liouville fractional Brownian motion with Hurst index H does not escape from a fixed interval [-L,L] up to time t. We show that for any H \in ]0,1], for both subdiffusion and superdiffusion regimes, this probability obeys \ln(P_t) \sim - t^{2 H}/L^2, i.e. may decay slower than exponential (subdiffusion) or faster than exponential (superdiffusion). This implies that survival probability S_t of particles undergoing fractional Brownian motion in a one-dimensional system with randomly placed traps follows \ln(S_t) \sim - n^{2/3} t^{2H/3} as t \to \infty, where n is the mean density of traps.
[ { "version": "v1", "created": "Fri, 4 Jan 2008 13:07:07 GMT" } ]
2008-01-07T00:00:00
[ [ "Oshanin", "G.", "" ] ]
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801.0677
Jad Saklawi
Paul C. Attie
Finite-state concurrent programs can be expressed pairwise
14 pages
null
null
null
cs.LO
null
We present a \emph{pairwise normal form} for finite-state shared memory concurrent programs: all variables are shared between exactly two processes, and the guards on transitions are conjunctions of conditions over this pairwise shared state. This representation has been used to efficiently (in polynomial time) synthesize and model-check correctness properties of concurrent programs. Our main result is that any finite state concurrent program can be transformed into pairwise normal form. Specifically, if $Q$ is an arbitrary finite-state shared memory concurrent program, then there exists a finite-state shared memory concurrent program $P$ expressed in pairwise normal form such that $P$ is strongly bisimilar to $Q$. Our result is constructive: we give an algorithm for producing $P$, given $Q$.
[ { "version": "v1", "created": "Fri, 4 Jan 2008 13:14:31 GMT" } ]
2008-01-07T00:00:00
[ [ "Attie", "Paul C.", "" ] ]
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801.0678
Joel Chevrier
Sylvain Marli\`ere (ICA), Jean Loup Florens (ICA), Florence Marchi (ESRF, NEEL), Annie Luciani (ICA), Joel Chevrier (ESRF, NEEL)
Implementation of perception and action at nanoscale
Proceedings of ENACTIVE/07 4th International Conference on Enactive Interfaces Grenoble, France, November 19th-22nd, 2007
null
null
null
cs.RO cs.HC
null
Real time combination of nanosensors and nanoactuators with virtual reality environment and multisensorial interfaces enable us to efficiently act and perceive at nanoscale. Advanced manipulation of nanoobjects and new strategies for scientific education are the key motivations. We have no existing intuitive representation of the nanoworld ruled by laws foreign to our experience. A central challenge is then the construction of nanoworld simulacrum that we can start to visit and to explore. In this nanoworld simulacrum, object identifications will be based on probed entity physical and chemical intrinsic properties, on their interactions with sensors and on the final choices made in building a multisensorial interface so that these objects become coherent elements of the human sphere of action and perception. Here we describe a 1D virtual nanomanipulator, part of the Cit\'e des Sciences EXPO NANO in Paris, that is the first realization based on this program.
[ { "version": "v1", "created": "Fri, 4 Jan 2008 13:38:39 GMT" } ]
2008-01-07T00:00:00
[ [ "Marlière", "Sylvain", "", "ICA" ], [ "Florens", "Jean Loup", "", "ICA" ], [ "Marchi", "Florence", "", "ESRF, NEEL" ], [ "Luciani", "Annie", "", "ICA" ], [ "Chevrier", "Joel", "", "ESRF, NEEL" ] ]
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801.0679
Olivier Ramar\'e
Olivier Ramar\'e
A stronger model for peg solitaire, II
27 pages, 31 figures
null
null
null
math.CO math.AG
null
The main problem addressed here is to decide whether it is possible or not to go from a given position on a peg-solitaire board to another one. No non-trivial sufficient conditions are known, but tests have been devised to show impossibility. We expose the way these tests work in a unified formalism and provide a new test which is strictly stronger than all previous ones.
[ { "version": "v1", "created": "Fri, 4 Jan 2008 13:39:55 GMT" } ]
2008-01-07T00:00:00
[ [ "Ramaré", "Olivier", "" ] ]
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801.068
Pamela Morehouse
CLEO Collaboration: J. Alexander, et al
Absolute Measurement of Hadronic Branching Fractions of the D_s^+ Meson
6 pages, postscript also available through http://www.lns.cornell.edu/public/CLNS/2007/, revised
Phys.Rev.Lett.100:161804,2008
10.1103/PhysRevLett.100.161804
CLNS 07/2016, CLEO 07-20
hep-ex
null
The branching fractions of D_s meson decays serve to normalize many measurements of processes involving charm quarks. Using 298 /pb of e+ e- collisions recorded at a center of mass energy of 4.17 GeV, we determine absolute branching fractions for eight D_s decays with a double tag technique. In particular we determine the branching fraction B(D_s -> K- K+ pi+) = (5.50 +- 0.23 +- 0.16)%, where the uncertainties are statistical and systematic respectively. We also provide partial branching fractions for kinematic subsets of the K- K+ pi+ decay mode.
[ { "version": "v1", "created": "Fri, 4 Jan 2008 13:44:16 GMT" }, { "version": "v2", "created": "Thu, 24 Apr 2008 14:48:04 GMT" } ]
2010-04-08T00:00:00
[ [ "CLEO Collaboration", "", "" ], [ "Alexander", "J.", "" ] ]
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801.0681
Zaninetti Lorenzo
Michele Rossi, Lorenzo Zaninetti
Linear and Non Linear Effects on the Newtonian Gravitational Constant as deduced from the Torsion Balance
11 pages, 2 figures
International Journal of Modern Physics A, Volume 29, pp. 5391-5400 (2007)
10.1142/S0217751X07037329
null
physics.class-ph physics.data-an
null
The Newtonian gravitational constant has still 150 parts per million of uncertainty. This paper examines the linear and nonlinear equations governing the rotational dynamics of the torsion gravitational balance. A nonlinear effect modifying the oscillation period of the torsion gravitational balance is carefully explored.
[ { "version": "v1", "created": "Fri, 4 Jan 2008 13:44:26 GMT" } ]
2008-01-07T00:00:00
[ [ "Rossi", "Michele", "" ], [ "Zaninetti", "Lorenzo", "" ] ]
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801.0682
Ryusuke Ikeda
Yuichi Matsunaga, Norihito Hiasa, and Ryusuke Ikeda
Modulated vortex states in Rashba non-centrosymmetric superconductors
Final version accepted for publication in Phys.Rev.B (Rapid Commmun.)
null
10.1103/PhysRevB.78.220508
null
cond-mat.supr-con
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Vortex lattice structures to occur in Rashba non-centrosymmetric superconductors under a magnetic field parallel to the basal plane are studied by assuming a singlet Cooper pairing and taking account of both the paramagnetic and orbital depairings. A vortex lattice of Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) type with modulation perpendicular to the field is expected to occur in the limit of vanishing ${\tilde \eta}$, where ${\tilde \eta}$ is the spin-orbit coupling {\it normalized} by Fermi energy. As ${\tilde \eta}$ increases, however, this state tends to be replaced by another new vortex lattice with a modulation of the gap amplitude parallel to the helical phase modulation induced by the absence of inversion symmetry. Differences of the present results from those in the Pauli limit and a correlation of a structural transition with the $H_{c2}(T)$-curve are discussed in relation to possible experimental realization.
[ { "version": "v1", "created": "Fri, 4 Jan 2008 15:16:08 GMT" }, { "version": "v2", "created": "Mon, 17 Mar 2008 07:40:59 GMT" }, { "version": "v3", "created": "Thu, 16 Oct 2008 09:37:28 GMT" }, { "version": "v4", "created": "Wed, 3 Dec 2008 03:01:32 GMT" } ]
2009-11-13T00:00:00
[ [ "Matsunaga", "Yuichi", "" ], [ "Hiasa", "Norihito", "" ], [ "Ikeda", "Ryusuke", "" ] ]
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801.0683
Thomas Kallinger
T. Kallinger, P. Reegen, W. W. Weiss
A heuristic derivation of the uncertainty of the frequency determination in time series data
null
null
10.1051/0004-6361:20077559
null
astro-ph
null
Context: Several approaches to estimate frequency, phase and amplitude errors in time series analyses were reported in the literature, but they are either time consuming to compute, grossly overestimating the error, or are based on empirically determined criteria. Aims: A simple, but realistic estimate of the frequency uncertainty in time series analyses. Methods: Synthetic data sets with mono- and multi-periodic harmonic signals and with randomly distributed amplitude, frequency and phase were generated and white noise added. We tried to recover the input parameters with classical Fourier techniques and investigated the error as a function of the relative level of noise, signal and frequency difference. Results: We present simple formulas for the upper limit of the amplitude, frequency and phase uncertainties in time-series analyses. We also demonstrate the possibility to detect frequencies which are separated by less than the classical frequency resolution and that the realistic frequency error is at least 4 times smaller than the classical frequency resolution.
[ { "version": "v1", "created": "Fri, 4 Jan 2008 14:16:50 GMT" } ]
2009-11-13T00:00:00
[ [ "Kallinger", "T.", "" ], [ "Reegen", "P.", "" ], [ "Weiss", "W. W.", "" ] ]
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801.0684
Norman G\"urlebeck
Norman G\"urlebeck
On Appell Sets and the Fueter-Sce Mapping
10 pages
Advances in Applied Clifford Algebras, Volume 19 (2009), Number 1, 51-61
10.1007/s00006-008-0126-3
null
math.CV
null
It is proved, that the recently discussed Appell polynomials in Clifford algebras are the Fueter-Sce extension of the complex monomials z^k. Furthermore, it is shown, for which complex functions the Fueter-Sce extension and the extension method using Appell polynomials coincide.
[ { "version": "v1", "created": "Fri, 4 Jan 2008 14:34:37 GMT" } ]
2011-06-13T00:00:00
[ [ "Gürlebeck", "Norman", "" ] ]
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801.0685
Irena Swanson
William Heinzer and Irena Swanson
The Goto numbers of parameter ideals
21 pages; the project started in a working group at AIM in December 2006
null
null
null
math.AC
null
Let Q be a parameter ideal of a Noetherian local ring (R,m). The Goto number g(Q) of Q is the largest integer g such that Q:m^g is integral over Q. We examine the values of g(Q) as Q varies over the parameter ideals of R. We concentrate mainly on the case where dim R = 1, and many of our results concern parameter ideals of a numerical semigroup ring.
[ { "version": "v1", "created": "Fri, 4 Jan 2008 18:36:22 GMT" } ]
2008-01-07T00:00:00
[ [ "Heinzer", "William", "" ], [ "Swanson", "Irena", "" ] ]
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801.0686
Florian Lenz Mr
Florian Lenz, Fotis K. Diakonos, Peter Schmelcher
Classical Dynamics of the Time-Dependent Elliptical Billiard
null
Phys. Rev. E, {\bf 76}, 066213 (2007)
10.1103/PhysRevE.76.066213
null
nlin.CD
null
In this work we study the nonlinear dynamics of the static and the driven ellipse. In the static case, we find numerically an asymptotical algebraic decay for the escape of an ensemble of non-interacting particles through a small hole due to the integrable structure of the phase space of the system. Furthermore, for a certain hole position a saturation value in the decay that can be tuned arbitrarily by varying the eccentricity of the ellipse is observed and explained. When applying harmonic boundary oscillations this saturation value caused by librator type orbits is gradually destroyed via two fundamental processes which are discussed in detail. As a result, an amplitude dependent emission rate is obtained in the long time behavior of the decay, suggesting that the driven elliptical billiard can be used as a controllable source of particles.
[ { "version": "v1", "created": "Fri, 4 Jan 2008 14:47:29 GMT" } ]
2008-01-07T00:00:00
[ [ "Lenz", "Florian", "" ], [ "Diakonos", "Fotis K.", "" ], [ "Schmelcher", "Peter", "" ] ]
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801.0687
Evgeny Korotyaev
Evgeny Korotyaev, Anton Kutsenko
Borg type uniqueness Theorems for periodic Jacobi operators with matrix valued coefficients
null
null
null
null
math.SP math-ph math.MP
null
We give a simple proof of Borg type uniqueness Theorems for periodic Jacobi operators with matrix valued coefficients.
[ { "version": "v1", "created": "Fri, 4 Jan 2008 14:54:43 GMT" } ]
2008-01-07T00:00:00
[ [ "Korotyaev", "Evgeny", "" ], [ "Kutsenko", "Anton", "" ] ]
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801.0688
James B. Hartle
James B. Hartle
Quantum Mechanics with Extended Probabilities
15 pages, 2 figures, revtex4, minor corrections, add'l references
Phys. Rev. A, 78, 012108 (2008)
10.1103/PhysRevA.78.012108
null
quant-ph gr-qc hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The quantum mechanics of closed systems such as the universe is formulated using an extension of familiar probability theory that incorporates negative probabilities. Probabilities must be positive for sets of alternative histories that are the basis of fair settleable bets. However, in quantum mechanics there are sets of alternative histories that can be described but which cannot be the basis for fair settleable bets. Members of such sets can be assigned extended probabilities that are sometimes negative. A prescription for extended probabilities is introduced that assigns extended probabilities to all histories that can be described, fine grained or coarse grained, members of decoherent sets or not. All probability sum rules are satisfied exactly. Sets of histories that are recorded to sufficient precision are the basis of settleable bets. This formulation is compared with the decoherent (consistent) histories formulation of quantum theory. Prospects are discussed for using this formulation to provide testable alternatives to quantum theory or further generalizations of it.
[ { "version": "v1", "created": "Fri, 4 Jan 2008 20:23:45 GMT" }, { "version": "v2", "created": "Fri, 4 Jan 2008 22:32:29 GMT" }, { "version": "v3", "created": "Thu, 17 Jul 2008 18:42:42 GMT" } ]
2009-11-13T00:00:00
[ [ "Hartle", "James B.", "" ] ]
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801.0689
Mikhail Fedorov V.
Yu.M. Mikhailova, P.A. Volkov, and M.V. Fedorov
Frequency and temporal entanglement of biphoton states in spontaneous parametric down conversion with a short-pulse pump
Contents is extended
null
null
null
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Spectral and temporal coincidence and single-particle photon wave packets are described and their widths and durations are found. The degree of entanglement is characterized by the experimentally measurable parameter R defined as the ratio of the coincidence and single-particle spectral widths. In the frequency representation, this parameter is found as a function of the pump-pulse duration. This function is shown to have a minimum and even in the minimum, at rather natural conditions, the parameter R is found to be very high (R=73>>1). The Schmidt number K is found for both short and long pump pulses and interpolated for arbitrary pulse durations. All functional dependences of R and K are found to be identical and numerical difference between them is shown to be not exceeding 20%. Two-time temporal wave function of a biphoton state is investigated in details, and a rather significant difference between the cases of short and long pump pulses is found to occur. In the case of long pulses, the temporal parameter R is defined as the ratio of durations of the single-particle and coincidence signals, and the defined in such a way parameter R is shown to be very close to the Schmidt number K.
[ { "version": "v1", "created": "Fri, 4 Jan 2008 15:31:57 GMT" }, { "version": "v2", "created": "Sat, 12 Jul 2008 07:04:33 GMT" } ]
2009-09-29T00:00:00
[ [ "Mikhailova", "Yu. M.", "" ], [ "Volkov", "P. A.", "" ], [ "Fedorov", "M. V.", "" ] ]
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801.069
Rubens Ramos Viana
Rubens Viana Ramos and Fabio Alencar Mendonca
Quantum bit commitment protocol without quantum memory
12 pages, 2 figures
null
null
null
quant-ph
null
Quantum protocols for bit commitment have been proposed and it is largely accepted that unconditionally secure quantum bit commitment is not possible; however, it can be more secure than classical bit commitment. In despite of its usefulness, quantum bit commitment protocols have not been experimentally implemented. The main reason is the fact that all proposed quantum bit commitment protocols require quantum memory. In this work, we show a quantum bit commitment protocol that does not require quantum memory and can be implemented with present technology.
[ { "version": "v1", "created": "Fri, 4 Jan 2008 15:33:07 GMT" } ]
2008-01-07T00:00:00
[ [ "Ramos", "Rubens Viana", "" ], [ "Mendonca", "Fabio Alencar", "" ] ]
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801.0691
George Tsibidis
George D. Tsibidis
A FRAP model to investigate reaction-diffusion of proteins within a bounded domain: a theoretical approach
25 pages. Abstracts Proceedings, The American Society for Cell Biology, 46th Annual Meeting, December 9-13, 2006, San Diego
Journal of Theoretical Biology 253 (2008) 755-768
10.1016/j.jtbi.2008.04.010
null
q-bio.SC physics.bio-ph q-bio.BM q-bio.QM
null
Temporally and spatially resolved measurements of protein transport inside cells provide important clues to the functional architecture and dynamics of biological systems. Fluorescence Recovery After Photobleaching (FRAP) technique has been used over the past three decades to measure the mobility of macromolecules and protein transport and interaction with immobile structures inside the cell nucleus. A theoretical model is presented that aims to describe protein transport inside the nucleus, a process which is influenced by the presence of a boundary (i.e. membrane). A set of reaction-diffusion equations is employed to model both the diffusion of proteins and their interaction with immobile binding sites. The proposed model has been designed to be applied to biological samples with a Confocal Laser Scanning Microscope (CLSM) equipped with the feature to bleach regions characterised by a scanning beam that has a radially Gaussian distributed profile. The proposed model leads to FRAP curves that depend on the on- and off-rates. Semi-analytical expressions are used to define the boundaries of on- (off-) rate parameter space in simplified cases when molecules move within a bounded domain. The theoretical model can be used in conjunction to experimental data acquired by CLSM to investigate the biophysical properties of proteins in living cells.
[ { "version": "v1", "created": "Fri, 4 Jan 2008 15:33:28 GMT" } ]
2009-03-04T00:00:00
[ [ "Tsibidis", "George D.", "" ] ]
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801.0692
Alexandre Eremenko
A. Eremenko and J. K. Langley
Meromorphic functions of one complex variable. A survey
33 pages
null
null
null
math.CV
null
This is an appendix to the English translation of the book by A. A. Goldberg and I. V. Ostrovskii, Distribution of values of meromorphic functions, Moscow, Nauka, 1970. An English translation of this book is to be published soon by the AMS. In this appendix we survey the results obtained on the topics of the book after 1970.
[ { "version": "v1", "created": "Fri, 4 Jan 2008 15:45:29 GMT" } ]
2008-01-07T00:00:00
[ [ "Eremenko", "A.", "" ], [ "Langley", "J. K.", "" ] ]
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801.0693
Annalisa Calamida
A. Calamida, C.E. Corsi, G. Bono (OAR/INAF), P. B. Stetson (HIA/NRC), L. M. Freyhammer (Univ. Lancashire), R. Buonanno (Univ. Rome)
Relative and absolute calibration for multi-band data collected with the 2.2m ESO/MPI and 1.54m Danish Telescopes
4 pages, 3 figures, to be published in the Springer-Verlag series "ESO Astrophysics Symposia"
null
10.1007/978-3-540-76963-7_80
null
astro-ph
null
We present the strategies adopted in the relative and absolute calibration of two different data sets: U,B,V,I-band images collected with the Wide Field Imager (WFI) mosaic camera mounted on the 2.2m ESO/MPI Telescope and u,v,b,y Stroemgren images collected with the 1.54m Danish Telescope (ESO, La Silla). In the case of the WFI camera we adopted two methods for the calibration, one for images collected before 2002, with the ESO filters U/38_ESO841 and B/99_ESO842, and a different one for data secured after 2002, with the filters U/50_ESO877 and B/123_ESO878. The positional and color effects turned out to be stronger for images collected with the old filters. The eight WFI chips of these images were corrected one by one, while in the case of images secured with the new filters, we corrected the entire mosaic in a single step. In the case of the Danish data set, we compared point-spread function (PSF) and aperture photometry for each frame, finding a trend in both the X and Y directions of the chip. The corrections resulted in a set of first and second order polynomials to be applied to the instrumental magnitudes of each individual frame as a function of the star position.
[ { "version": "v1", "created": "Fri, 4 Jan 2008 15:47:01 GMT" } ]
2015-05-13T00:00:00
[ [ "Calamida", "A.", "", "OAR/INAF" ], [ "Corsi", "C. E.", "", "OAR/INAF" ], [ "Bono", "G.", "", "OAR/INAF" ], [ "Stetson", "P. B.", "", "HIA/NRC" ], [ "Freyhammer", "L. M.", "", "Univ. Lancashire" ], [ "Buonanno", "R.", "", "Univ. Rome" ] ]
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801.0694
Valery Koryukin
V. M. Koryukin
On the Higgs mechanism and the gauge field theory
null
null
null
null
physics.gen-ph hep-ph
null
As laboratory experiments for the detection of particles with non-zero rest masses forming the dark matter do not give positive results we offer once more to turn the attention upon the neutrinos background of the Universe. If the neutrinos background has the temperature 2 K, then direct observations of particles are impossible ones and only their high density allows hope for the success indirect observations. In consequence of this the field theory is constructed as the maximum plausible reduction of the Feynman formulation of the quantum theory displaying experiment data adequately.
[ { "version": "v1", "created": "Fri, 4 Jan 2008 15:48:41 GMT" } ]
2008-01-07T00:00:00
[ [ "Koryukin", "V. M.", "" ] ]
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801.0695
Mark Veraar
Sonja Cox, Mark Veraar
Some remarks on tangent martingale difference sequences in $L^1$-spaces
null
Electron. Commun. Probab. 12, 421-433, (2007)
null
null
math.PR math.FA
null
Let X be a Banach space. Suppose that for all $p\in (1, \infty)$ a constant $C_{p,X}$ depending only on X and p exists such that for any two X-valued martingales f and g with tangent martingale difference sequences one has \[\E\|f\|^p \leq C_{p,X} \E\|g\|^p (*).\] This property is equivalent to the UMD condition. In fact, it is still equivalent to the UMD condition if in addition one demands that either f or g satisfy the so-called (CI) condition. However, for some applications it suffices to assume that (*) holds whenever g satisfies the (CI) condition. We show that the class of Banach spaces for which (*) holds whenever only g satisfies the (CI) condition is more general than the class of UMD spaces, in particular it includes the space L^1. We state several problems related to (*) and other decoupling inequalities.
[ { "version": "v1", "created": "Fri, 4 Jan 2008 16:09:55 GMT" } ]
2008-01-07T00:00:00
[ [ "Cox", "Sonja", "" ], [ "Veraar", "Mark", "" ] ]
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801.0696
Rubens Ramos Viana
Rubens Viana Ramos and Jose Claudio do Nascimento
Quantum Zero-Knowledge Protocol Using Quantum Bit Commitment without Quantum Memory
4 pages and 1 figure
null
null
null
quant-ph
null
Zero-knowledge proof system is an important protocol that can be used as a basic block for construction of other more complex cryptographic protocols. Quantum zero-knowledge protocols have been proposed but, since their implementation requires advanced quantum technology devices, experimental implementation of zero-knowledge protocols have not being reported. In this work, we present a quantum zero-knowledge protocol based on a quantum bit commitment protocol that can be implemented with today technology. Hence, our quantum zero-knowledge protocol can be readily implemented.
[ { "version": "v1", "created": "Fri, 4 Jan 2008 15:59:42 GMT" } ]
2008-01-07T00:00:00
[ [ "Ramos", "Rubens Viana", "" ], [ "Nascimento", "Jose Claudio do", "" ] ]
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801.0697
Miika Klemetti
The BABAR Collaboration, B. Aubert, et al
Searches for the decays B0 -> l+ tau- and B+ -> l+ nu (l=e,mu) using hadronic tag reconstruction
8 pages, 2 postscript figures, submitted to PRD-RC
Phys.Rev.D77:091104,2008
10.1103/PhysRevD.77.091104
BABAR-PUB-07/069, SLAC-PUB-13066
hep-ex
null
We present searches for the leptonic decays B+ -> l+ nu and the lepton flavor violating decays B0 -> l+ tau-, where l=e,mu, with data collected by the BaBar experiment at SLAC. This search demonstrates a novel technique in which we fully reconstruct the accompanying Bbar in Upsilon(4S)->BBbar events, and look for a monoenergetic lepton from the signal B decay. The signal yield is extracted from a fit to the signal lepton candidate momentum distribution in the signal B rest frame. Using a data sample of approximately 378 million BBbar pairs (342fb-1), we find no evidence of signal in any of the decay modes. Branching fraction upper limits of B(B+ -> e+ nu)<5.2x10^-6, B(B+ -> mu+ nu)<5.6x10^-6, B(B0 -> e+ tau-)<2.8x10^-5 and B(B0 -> mu+ tau-)<2.2x10^-5, are obtained at 90% confidence level.
[ { "version": "v1", "created": "Fri, 4 Jan 2008 16:07:00 GMT" } ]
2010-04-12T00:00:00
[ [ "The BABAR Collaboration", "", "" ], [ "Aubert", "B.", "" ] ]
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801.0698
Matthias H. Hettler
Jasmin Aghassi, Matthias H. Hettler, and Gerd Sch\"on
Co-tunneling assisted sequential tunneling in multi-level quantum dots
10 pages including 3 color figures
Applied Physics Letters, Vol. 92, 202101 (2008)
10.1063/1.2927379
null
cond-mat.mes-hall
null
We investigate the conductance and zero-frequency shot noise of interacting, multi-level quantum dots coupled to leads. We observe that co-tunneling assisted sequential tunneling (CAST) processes play a dominant role in the transition region from Coulomb blockade to sequential tunneling. We analyze for intermediate coupling strength the dependence of the conductance due to CAST processes on temperature, coupling constant, and gate voltage. Remarkably, the width of the CAST transport feature scales only with temperature, but not with the coupling constant. While the onset of inelastic co-tunneling is associated with a super-Poissonian noise, the noise is even stronger above the threshold for CAST processes
[ { "version": "v1", "created": "Fri, 4 Jan 2008 16:08:35 GMT" } ]
2008-05-30T00:00:00
[ [ "Aghassi", "Jasmin", "" ], [ "Hettler", "Matthias H.", "" ], [ "Schön", "Gerd", "" ] ]
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801.0699
Orkan Umurhan
Oded Regev
Hydrodynamical activity in thin accretion disks
To appear in New Astronomy Review, Proc. of "J-P. Lasota, X-ray binaries, accretion disks and compact stars" (October 2007); Abramowicz, M. Ed
New Astron.Rev.51:819-827,2008
10.1016/j.newar.2008.03.011
null
astro-ph
null
An asymptotic treatment of thin accretion disks, introduced by Klu\'zniak & Kita (2000) for a steady-state disk flow, is extended to a time-dependent problem. Transient growth of axisymmetric disturbances is analytically shown to occur on the global disk scale. The implications of this result on the theory of hydrodynamical thin accretion disks, as well as future prospects, are discussed.
[ { "version": "v1", "created": "Fri, 4 Jan 2008 18:28:38 GMT" }, { "version": "v2", "created": "Thu, 10 Jan 2008 17:48:01 GMT" } ]
2009-06-23T00:00:00
[ [ "Regev", "Oded", "" ] ]
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801.07
Anna Kowalczyk
Anna Kowalczyk
Proton induced spallation reactions in the energy range 0.1 - 10 GeV
null
null
null
null
nucl-th
null
One of considered nowadays scenarios of proton - nucleus reaction is spallation. Its motivation is based on experimental final-state observations of one heavy nucleus, a small number of light fragments and numerous individual nucleons. It is theoretically described as two step process involving energy deposition in the target nucleus and subsequent evaporation. Several models, based on different assumptions, have been constructed in order to describe the spallation process. The main subject of this work is description of global average properties of proton induced spallation reactions in wide range of projectile energy (0.1 - 10 GeV) and mass of target nuclei. This is investigated within Hadron String Dynamics (HSD) model, based on Boltzmann - Uehling - Uhlenbeck (BUU) equation, supplemented by a statistical evaporation model for the second stage of the reaction. It has been shown that spallation is the most probable scenario of proton - nucleus reaction. Proton induced reactions, in considered here incident energy range, are visibly non-invasive processes. Properties of residual nuclei after the first stage of the reaction are weakly dependent on incident energy, but strongly dependent on mass of target. The second stage of the reaction is a competition of evaporation and fission. Results obtained from the HSD model vary smoothly as function of proton incident energy and mass of target, so interpolation of the results is quite feasible.
[ { "version": "v1", "created": "Fri, 4 Jan 2008 15:55:21 GMT" } ]
2008-01-07T00:00:00
[ [ "Kowalczyk", "Anna", "" ] ]
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801.0701
Leah Nutman
Leah Nutman and Michael Langberg
Adversarial Models and Resilient Schemes for Network Coding
Second version includes minor editing
null
null
null
cs.IT cs.DC cs.NI math.IT
null
In a recent paper, Jaggi et al. (INFOCOM 2007), presented a distributed polynomial-time rate-optimal network-coding scheme that works in the presence of Byzantine faults. We revisit their adversarial models and augment them with three, arguably realistic, models. In each of the models, we present a distributed scheme that demonstrates the usefulness of the model. In particular, all of the schemes obtain optimal rate $C-z$, where $C$ is the network capacity and $z$ is a bound on the number of links controlled by the adversary.
[ { "version": "v1", "created": "Fri, 4 Jan 2008 16:17:49 GMT" }, { "version": "v2", "created": "Wed, 6 Feb 2008 16:49:31 GMT" } ]
2008-02-06T00:00:00
[ [ "Nutman", "Leah", "" ], [ "Langberg", "Michael", "" ] ]
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801.0702
Sonia Schirmer
Xiaoting Wang and Sonia G. Schirmer
Analysis of Lyapunov Method for Control of Quantum Systems
20 pages, 1 figure, draft version
null
10.1109/TAC.2010.2043292 10.1109/TAC.2010.204276
null
quant-ph
null
We present a detailed analysis of the convergence properties of Lyapunov control for finite-dimensional quantum systems based on the application of the LaSalle invariance principle and stability analysis from dynamical systems and control theory. For a certain class of ideal Hamiltonians, convergence results are derived both pure-state and mixed-state control, and the effectiveness of the method for more realistic Hamiltonians is discussed.
[ { "version": "v1", "created": "Fri, 4 Jan 2008 17:26:59 GMT" }, { "version": "v2", "created": "Mon, 19 May 2008 15:02:07 GMT" } ]
2012-02-14T00:00:00
[ [ "Wang", "Xiaoting", "" ], [ "Schirmer", "Sonia G.", "" ] ]
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801.0703
Silvia Dalla
S. Dalla, L. Fletcher and N.A. Walton
Invisible sunspots and rate of solar magnetic flux emergence
A&A Lett, in press, 2008
A&A 479, L1-L4 (2008)
10.1051/0004-6361:20078800
null
astro-ph
null
We study the visibility of sunspots and its influence on observed values of sunspot region parameters. We use Virtual Observatory tools provided by AstroGrid to analyse a sample of 6862 sunspot regions. By studying the distributions of locations where sunspots were first and last observed on the solar disk, we derive the visibility function of sunspots, the rate of magnetic flux emergence and the ratio between the durations of growth and decay phases of solar active regions. We demonstrate that the visibility of small sunspots has a strong center-to-limb variation, far larger than would be expected from geometrical (projection) effects. This results in a large number of young spots being invisible: 44% of new regions emerging in the West of the Sun go undetected. For sunspot regions that are detected, large differences exist between actual locations and times of flux emergence, and the apparent ones derived from sunspot data. The duration of the growth phase of solar regions has been up to now underestimated.
[ { "version": "v1", "created": "Fri, 4 Jan 2008 16:24:20 GMT" } ]
2008-02-12T00:00:00
[ [ "Dalla", "S.", "" ], [ "Fletcher", "L.", "" ], [ "Walton", "N. A.", "" ] ]
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801.0704
Albert Linnell
Albert P. Linnell, Patrick Godon, Ivan Hubeny, Edward M. Sion, Paula Szkody, and Paul E. Barrett
Synthetic Spectrum Constraints on a Model of the Cataclysmic Variable QU Carinae
52 pages, 19 Figures
null
10.1086/529118
null
astro-ph
null
Neither standard model SEDs nor truncated standard model SEDs fit observed spectra of QU Carinae with acceptable accuracy over the range 900\AA to 3000\AA. Non-standard model SEDs fit the observation set accurately. The non-standard accretion disk models have a hot region extending from the white dwarf to $R=1.36R_{\rm wd}$,a narrow intermediate temperature annulus, and an isothermal remainder to the tidal cutoff boundary. The models include a range of $\dot{M}$ values between $1.0{\times}10^{-7}M_{\odot} {\rm yr}^{-1}$ and $1.0{\times}10^{-6}M_{\odot} {\rm yr}^{-1}$ and limiting values of $M_{\rm wd}$ between $0.6M_{\odot}$ and $1.2M_{\odot}$. A solution with $M_{\rm wd}=1.2M_{\odot}$ is consistent with an empirical mass-period relation. The set of models agree on a limited range of possible isothermal region $T_{\rm eff}$ values between 14,000K and 18,000K. The model-to-model residuals are so similar that it is not possible to choose a best model. The Hipparcos distance, 610 pc, is representative of the model results. The orbital inclination is between $40\arcdeg$ and $60\arcdeg$.
[ { "version": "v1", "created": "Fri, 4 Jan 2008 16:45:03 GMT" } ]
2009-11-13T00:00:00
[ [ "Linnell", "Albert P.", "" ], [ "Godon", "Patrick", "" ], [ "Hubeny", "Ivan", "" ], [ "Sion", "Edward M.", "" ], [ "Szkody", "Paula", "" ], [ "Barrett", "Paul E.", "" ] ]
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801.0705
Leo Medeiros Gouvea
R. Aldrovandi, R.R. Cuzinatto, L. G. Medeiros
Realistic Equations of State for the Primeval Universe
32 pages, 5 figures. Citations added in this version. Accepted EPJC
Eur.Phys.J.C58:483-497,2008
10.1140/epjc/s10052-008-0780-6
null
astro-ph gr-qc
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Early universe equations of state including realistic interactions between constituents are built up. Under certain reasonable assumptions, these equations are able to generate an inflationary regime prior to the nucleosynthesis period. The resulting accelerated expansion is intense enough to solve the flatness and horizon problems. In the cases of curvature parameter \kappa equal to 0 or +1, the model is able to avoid the initial singularity and offers a natural explanation for why the universe is in expansion.
[ { "version": "v1", "created": "Fri, 4 Jan 2008 18:18:24 GMT" }, { "version": "v2", "created": "Tue, 21 Oct 2008 21:03:30 GMT" } ]
2008-12-18T00:00:00
[ [ "Aldrovandi", "R.", "" ], [ "Cuzinatto", "R. R.", "" ], [ "Medeiros", "L. G.", "" ] ]
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801.0706
Rhaana L. C. Starling
R.L.C. Starling (University of Leicester, UK)
Strong spectral evolution during the prompt emission of GRB 070616
4 pages, 2 figures (Fig 1 in colour), contributed talk, submitted to the proceedings of Gamma Ray Bursts 2007, Santa Fe, New Mexico, November 5-9 2007
AIP Conf.Proc.1000:113-116,2008
10.1063/1.2943421
null
astro-ph
null
Swift has revealed features in GRB early light curves, such as steep decays and X-ray flares, whose properties are consistent with an internal origin though they are far from understood. The steep X-ray decay is often explained using the curvature effect; however a significant number of GRBs display strong spectral evolution during this phase, and a new mechanism must be invoked to explain this. Of particular interest are the longest duration GRBs in which the early emission can be studied in most detail. Here we present data for GRB 070616, in which the prompt emission shows a complex multipeaked structure, leading to one of the longest prompt emission durations ever recorded. We take advantage of extensive coverage of such a long burst by all Swift instruments. Combining data from Swift and Suzaku we study the evolution of the prompt emission spectrum, following the temporal variability of the peak energy and spectral slope.
[ { "version": "v1", "created": "Fri, 4 Jan 2008 16:51:45 GMT" } ]
2009-06-23T00:00:00
[ [ "Starling", "R. L. C.", "", "University of Leicester, UK" ] ]
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801.0707
Morten Bache
M. Bache, O. Bang, W. Krolikowski, J. Moses, and F. W. Wise
Limits to compression with cascaded quadratic soliton compressors
16 pages, 5 figures, submitted to Optics Express
Optics Express, Vol. 16, Issue 5, pp. 3273-3287 (2008), http://www.opticsexpress.org/abstract.cfm?id=154644
10.1364/OE.16.003273
null
physics.optics
null
We study cascaded quadratic soliton compressors and address the physical mechanisms that limit the compression. A nonlocal model is derived, and the nonlocal response is shown to have an additional oscillatory component in the nonstationary regime when the group-velocity mismatch (GVM) is strong. This inhibits efficient compression. Raman-like perturbations from the cascaded nonlinearity, competing cubic nonlinearities, higher-order dispersion, and soliton energy may also limit compression, and through realistic numerical simulations we point out when each factor becomes important. We find that it is theoretically possible to reach the single-cycle regime by compressing high-energy fs pulses for wavelengths $\lambda=1.0-1.3 \mu{\rm m}$ in a $\beta$-barium-borate crystal, and it requires that the system is in the stationary regime, where the phase mismatch is large enough to overcome the detrimental GVM effects. However, the simulations show that reaching single-cycle duration is ultimately inhibited by competing cubic nonlinearities as well as dispersive waves, that only show up when taking higher-order dispersion into account.
[ { "version": "v1", "created": "Fri, 4 Jan 2008 17:22:13 GMT" } ]
2009-11-13T00:00:00
[ [ "Bache", "M.", "" ], [ "Bang", "O.", "" ], [ "Krolikowski", "W.", "" ], [ "Moses", "J.", "" ], [ "Wise", "F. W.", "" ] ]
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801.0708
Igor Shovkovy
V. P. Gusynin, V. A. Miransky, S. G. Sharapov, I. A. Shovkovy and C.M. Wyenberg
Edge states on graphene ribbon in magnetic field: interplay between Dirac and ferromagnetic-like gaps
13 pages, 7 figures. v2: analysis for ribbons with armchair edges added, to appear in Phys. Rev. B
Phys. Rev. B 79, 115431 (2009)
10.1103/PhysRevB.79.115431
UWO-TH-08/1
cond-mat.mes-hall
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
By combining analytic and numerical methods, edge states on a finite width graphene ribbon in a magnetic field are studied in the framework of low-energy effective theory that takes into account the possibility of quantum Hall ferromagnetism (QHF) gaps and dynamically generated Dirac-like masses. The analysis is done for graphene ribbons with both zigzag and armchair edges. The characteristic features of the spectrum of the edge states in both these cases are described. In particular, the conditions for the existence of the gapless edge states are established. Implications of these results for the interpretation of recent experiments are discussed.
[ { "version": "v1", "created": "Fri, 4 Jan 2008 17:09:45 GMT" }, { "version": "v2", "created": "Tue, 27 Jan 2009 16:07:07 GMT" } ]
2009-03-25T00:00:00
[ [ "Gusynin", "V. P.", "" ], [ "Miransky", "V. A.", "" ], [ "Sharapov", "S. G.", "" ], [ "Shovkovy", "I. A.", "" ], [ "Wyenberg", "C. M.", "" ] ]
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801.0709
Arun Ram
James Parkinson, Arun Ram, Christoph Schwer
Combinatorics in affine flag varieties
21 pages,
null
null
null
math.RT math.CO
null
The Littelmann path moel gives a realization of the crystals of integrable representations of symmetrizable Kac-Moody Lie algebras. Recent work of Gaussent-Littelmann and others has demonstrated a connection between this model and the geometry of the loop Grassmannian. The alcove walk model is a version of the path model which is intimately connected to the combinatorics of the affine Hecke algebra. In this paper we define a refined alcove walk model which encodes the points of the affine flag variety. We show that this combinatorial indexing naturally indexes the "cells" in generalized Mirkovic-Vilonen intersections.
[ { "version": "v1", "created": "Fri, 4 Jan 2008 17:16:07 GMT" } ]
2008-01-07T00:00:00
[ [ "Parkinson", "James", "" ], [ "Ram", "Arun", "" ], [ "Schwer", "Christoph", "" ] ]
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801.071
Mats Andersson
Mats Andersson, H{\aa}kan Samuelsson
Koppelman formulas and the $\dbar$-equation on an analytic space
null
null
null
null
math.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Let $X$ be an analytic space of pure dimension. We introduce a formalism to generate intrinsic weighted Koppelman formulas on $X$ that provide solutions to the $\dbar$-equation. We prove that if $\phi$ is a smooth $(0,q+1)$-form on a Stein space $X$ with $\dbar\phi=0$, then there is a smooth $(0,q)$-form $\psi$ on $X_{reg}$ with at most polynomial growth at $X_{sing}$ such that $\dbar\psi=\phi$. The integral formulas also give other new existence results for the $\dbar$-equation and Hartogs theorems, as well as new proofs of various known results.
[ { "version": "v1", "created": "Fri, 4 Jan 2008 17:19:07 GMT" }, { "version": "v2", "created": "Mon, 11 Feb 2008 16:49:10 GMT" }, { "version": "v3", "created": "Tue, 23 Sep 2008 07:39:42 GMT" } ]
2016-08-14T00:00:00
[ [ "Andersson", "Mats", "" ], [ "Samuelsson", "Håkan", "" ] ]
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801.0711
Joseph Fu
Andreas Bernig and Joseph H.G. Fu
Hermitian integral geometry
To appear in Ann. of Math. Version for publication
Ann. of Math. 173 (2011), 907-945
null
null
math.DG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We give in explicit form the principal kinematic formula for the action of the affine unitary group on $\C^n$, together with a straightforward algebraic method for computing the full array of unitary kinematic formulas, expressed in terms of certain convex valuations introduced, essentially, by H. Tasaki. We introduce also several other canonical bases for the algebra of unitary-invariant valuations, explore their interrelations, and characterize in these terms the cones of positive and monotone elements.
[ { "version": "v1", "created": "Fri, 4 Jan 2008 17:23:24 GMT" }, { "version": "v2", "created": "Sat, 5 Jan 2008 19:06:50 GMT" }, { "version": "v3", "created": "Fri, 11 Jan 2008 15:34:09 GMT" }, { "version": "v4", "created": "Sun, 13 Jan 2008 11:52:09 GMT" }, { "version": "v5", "created": "Tue, 25 Mar 2008 15:53:07 GMT" }, { "version": "v6", "created": "Thu, 19 Feb 2009 14:39:41 GMT" }, { "version": "v7", "created": "Thu, 2 Jul 2009 19:40:10 GMT" }, { "version": "v8", "created": "Tue, 1 Sep 2009 15:30:40 GMT" }, { "version": "v9", "created": "Tue, 12 Jan 2010 16:37:07 GMT" } ]
2011-04-19T00:00:00
[ [ "Bernig", "Andreas", "" ], [ "Fu", "Joseph H. G.", "" ] ]
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801.0712
Hanna Jankowski
Hanna K. Jankowski, Jon A. Wellner
Nonparametric estimation of a convex bathtub-shaped hazard function
Published in at http://dx.doi.org/10.3150/09-BEJ202 the Bernoulli (http://isi.cbs.nl/bernoulli/) by the International Statistical Institute/Bernoulli Society (http://isi.cbs.nl/BS/bshome.htm)
Bernoulli 2009, Vol. 15, No. 4, 1010-1035
10.3150/09-BEJ202
IMS-BEJ-BEJ202
math.ST stat.TH
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we study the nonparametric maximum likelihood estimator (MLE) of a convex hazard function. We show that the MLE is consistent and converges at a local rate of $n^{2/5}$ at points $x_0$ where the true hazard function is positive and strictly convex. Moreover, we establish the pointwise asymptotic distribution theory of our estimator under these same assumptions. One notable feature of the nonparametric MLE studied here is that no arbitrary choice of tuning parameter (or complicated data-adaptive selection of the tuning parameter) is required.
[ { "version": "v1", "created": "Fri, 4 Jan 2008 17:55:06 GMT" }, { "version": "v2", "created": "Thu, 14 Jan 2010 08:46:23 GMT" } ]
2010-01-14T00:00:00
[ [ "Jankowski", "Hanna K.", "" ], [ "Wellner", "Jon A.", "" ] ]
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801.0713
Letian Ding
Letian Ding, Noah Bray-Ali, Rong Yu and Stephan Haas
Subarea law of entanglement in nodal fermionic systems
4 pages,4 figures; published version
Phys. Rev. Lett. 100, 215701 (2008)
10.1103/PhysRevLett.100.215701
null
cond-mat.str-el cond-mat.stat-mech quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We investigate the subarea law scaling properties of the block entropy in bipartite fermionic systems which do not have a finite Fermi surface. It is found that in gapped regimes the leading subarea term is a negative constant, whereas in critical regimes with point nodes the leading subarea law is a logarithmic additive term. At the phase boundary that separates the critical and non-critical regimes, the subarea scaling shows power-law behavior.
[ { "version": "v1", "created": "Fri, 4 Jan 2008 17:48:33 GMT" }, { "version": "v2", "created": "Wed, 24 Sep 2008 18:00:35 GMT" } ]
2008-09-24T00:00:00
[ [ "Ding", "Letian", "" ], [ "Bray-Ali", "Noah", "" ], [ "Yu", "Rong", "" ], [ "Haas", "Stephan", "" ] ]
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801.0714
James Cheney
James Cheney
Regular Expression Subtyping for XML Query and Update Languages
ESOP 2008. Companion technical report with proofs
null
null
null
cs.PL cs.DB
null
XML database query languages such as XQuery employ regular expression types with structural subtyping. Subtyping systems typically have two presentations, which should be equivalent: a declarative version in which the subsumption rule may be used anywhere, and an algorithmic version in which the use of subsumption is limited in order to make typechecking syntax-directed and decidable. However, the XQuery standard type system circumvents this issue by using imprecise typing rules for iteration constructs and defining only algorithmic typechecking, and another extant proposal provides more precise types for iteration constructs but ignores subtyping. In this paper, we consider a core XQuery-like language with a subsumption rule and prove the completeness of algorithmic typechecking; this is straightforward for XQuery proper but requires some care in the presence of more precise iteration typing disciplines. We extend this result to an XML update language we have introduced in earlier work.
[ { "version": "v1", "created": "Fri, 4 Jan 2008 18:13:48 GMT" } ]
2008-01-07T00:00:00
[ [ "Cheney", "James", "" ] ]
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801.0715
Grenville Croll
Stephen G. Powell, Barry Lawson, and Kenneth R. Baker
Impact of Errors in Operational Spreadsheets
12 pages including references
Proc. European Spreadsheet Risks Int. Grp. 2007 57-68 ISBN 978-905617-58-6
null
null
cs.CY
null
All users of spreadsheets struggle with the problem of errors. Errors are thought to be prevalent in spreadsheets, and in some instances they have cost organizations millions of dollars. In a previous study of 50 operational spreadsheets we found errors in 0.8% to 1.8% of all formula cells, depending on how errors are defined. In the current study we estimate the quantitative impacts of errors in 25 operational spreadsheets from five different organizations. We find that many errors have no quantitative impact on the spreadsheet. Those that have an impact often affect unimportant portions of the spreadsheet. The remaining errors do sometimes have substantial impacts on key aspects of the spreadsheet. This paper provides the first fully-documented evidence on the quantitative impact of errors in operational spreadsheets.
[ { "version": "v1", "created": "Fri, 4 Jan 2008 18:26:10 GMT" } ]
2008-03-10T00:00:00
[ [ "Powell", "Stephen G.", "" ], [ "Lawson", "Barry", "" ], [ "Baker", "Kenneth R.", "" ] ]
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801.0716
Brian Jackson
Brian Jackson, Richard Greenberg, Rory Barnes
Tidal Evolution of Close-in Extra-Solar Planets
accepted to ApJ
null
null
null
astro-ph
null
The distribution of eccentricities e of extra-solar planets with semi-major axes a > 0.2 AU is very uniform, and values for e are relatively large, averaging 0.3 and broadly distributed up to near 1. For a < 0.2 AU, eccentricities are much smaller (most e < 0.2), a characteristic widely attributed to damping by tides after the planets formed and the protoplanetary gas disk dissipated. Most previous estimates of the tidal damping considered the tides raised on the planets, but ignored the tides raised on the stars. Most also assumed specific values for the planets' poorly constrained tidal dissipation parameter Qp. Perhaps most important, in many studies, the strongly coupled evolution between e and a was ignored. We have now integrated the coupled tidal evolution equations for e and a over the estimated age of each planet, and confirmed that the distribution of initial e values of close-in planets matches that of the general population for reasonable Q values, with the best fits for stellar and planetary Q being ~10^5.5 and ~10^6.5, respectively. The accompanying evolution of a values shows most close-in planets had significantly larger a at the start of tidal migration. The earlier gas disk migration did not bring all planets to their current orbits. The current small values of a were only reached gradually due to tides over the lifetimes of the planets. These results may have important implications for planet formation models, atmospheric models of "hot Jupiters", and the success of transit surveys.
[ { "version": "v1", "created": "Fri, 4 Jan 2008 19:05:18 GMT" } ]
2008-01-07T00:00:00
[ [ "Jackson", "Brian", "" ], [ "Greenberg", "Richard", "" ], [ "Barnes", "Rory", "" ] ]
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801.0717
Anirban Pathak
Amit Verma and Anirban Pathak
Reduction of Quantum Phase Fluctuations in Intermediate States
10 pages, 5 figures
Phys. Lett A 373 (2009) 1421
10.1016/j.physleta.2009.02.038
null
quant-ph
null
Recently we have shown that the reduction of the Carruthers-Nieto symmetric quantum phase fluctuation parameter (U) with respect to its coherent state value corresponds to an antibunched state, but the converse is not true. Consequently reduction of U is a stronger criterion of nonclassicality than the lowest order antibunching. Here we have studied the possibilities of reduction of $U$ in intermediate states by using the Barnett Pegg formalism. We have shown that the reduction of phase fluctuation parameter U can be seen in different intermediate states, such as binomial state, generalized binomial state, hypergeometric state, negative binomial state, and photon added coherent state. It is also shown that the depth of nonclassicality can be controlled by various parameters related to intermediate states. Further, we have provided specific examples of antibunched states, for which $U$ is greater than its poissonian state value.
[ { "version": "v1", "created": "Fri, 4 Jan 2008 19:08:02 GMT" } ]
2022-06-07T00:00:00
[ [ "Verma", "Amit", "" ], [ "Pathak", "Anirban", "" ] ]
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801.0718
Erhan Bayraktar
Erhan Bayraktar, Hasanjan Sayit
On the Stickiness Property
Key words: Transaction costs. No Arbitrage. Sticky processes. Time change
null
null
null
q-fin.PR math.PR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In [2] the notion of stickiness for stochastic processes was introduced. It was also shown that stickiness implies absense of arbitrage in a market with proportional transaction costs. In this paper, we investigate the notion of stickiness further. In particular, we give examples of processes that are not semimartingales but are sticky.
[ { "version": "v1", "created": "Fri, 4 Jan 2008 19:41:05 GMT" }, { "version": "v2", "created": "Tue, 15 Jan 2008 17:53:21 GMT" }, { "version": "v3", "created": "Sat, 27 Sep 2008 22:07:57 GMT" }, { "version": "v4", "created": "Mon, 14 Sep 2009 18:04:53 GMT" } ]
2009-09-14T00:00:00
[ [ "Bayraktar", "Erhan", "" ], [ "Sayit", "Hasanjan", "" ] ]
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801.0719
Michael Macy
Arnout Van de Rijt, David Siegel, Michael Macy
Neighborhood Chance and Neighborhood Change
Forthcoming in American Journal of Sociology
null
null
null
nlin.AO physics.soc-ph
null
WITHDRAWAL NOTICE This paper has been withdrawn by the authors as required by the American Journal of Sociology, which has accepted the paper for publication. AJS will not publish papers if the preprint remains posted on arXiv.
[ { "version": "v1", "created": "Fri, 4 Jan 2008 19:14:23 GMT" }, { "version": "v2", "created": "Mon, 21 Jan 2008 20:19:28 GMT" }, { "version": "v3", "created": "Mon, 21 Jan 2008 22:04:36 GMT" }, { "version": "v4", "created": "Wed, 23 Jan 2008 17:49:34 GMT" }, { "version": "v5", "created": "Fri, 25 Jan 2008 15:45:12 GMT" }, { "version": "v6", "created": "Sun, 27 Jan 2008 22:13:00 GMT" } ]
2008-01-28T00:00:00
[ [ "Van de Rijt", "Arnout", "" ], [ "Siegel", "David", "" ], [ "Macy", "Michael", "" ] ]
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801.072
Marco Aurelio Cattacin Kneipp
Marco A. C. Kneipp
Hitchin's equations and integrability of BPS Z(N) strings in Yang-Mills theories
13 pages. Some comments and references added; change of a convention (Eq. (9)); version to appear in JHEP
JHEP 0811:049,2008
10.1088/1126-6708/2008/11/049
null
hep-th hep-lat nlin.SI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We show that Z(N) string's BPS equations are equivalent to the Hitchin's equations (or self-duality equation) and also to the zero curvature condition. We construct a general form for BPS Z(N) string solutions for arbitrary simple gauge groups with non-trivial center. Depending on the vacuum solutions considered, the Z(N) string's BPS equations reduce to different two dimensional integrable field equations. For a particular vacuum we obtain the equation of affine Toda field theory.
[ { "version": "v1", "created": "Fri, 4 Jan 2008 19:25:49 GMT" }, { "version": "v2", "created": "Wed, 19 Nov 2008 01:45:11 GMT" } ]
2009-12-15T00:00:00
[ [ "Kneipp", "Marco A. C.", "" ] ]
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801.0721
Sonia Schirmer
Sonia G. Schirmer, Ivan C. H. Pullen, Peter J. Pemberton-Ross
Global controllability with a single local actuator
7 pages, 1 table, no figures
Phys. Rev. A 78, 062339 (2008)
10.1103/PhysRevA.78.062339
null
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We show that we can achieve global density-operator controllability for most N-dimensional bilinear Hamiltonian control systems with general fixed couplings using a single, locally-acting actuator that modulates one energy-level transition. Controllability depends upon the position of the actuator and relies on the absence of either decompositions into non-interacting subgroups or symmetries restricting the dynamics to a subgroup of SU(N). These results are applied to spin-chain systems and used to explicitly construct control sequences for a single binary-valued switch actuator.
[ { "version": "v1", "created": "Fri, 4 Jan 2008 19:27:05 GMT" }, { "version": "v2", "created": "Fri, 6 Jun 2008 10:57:15 GMT" } ]
2009-11-13T00:00:00
[ [ "Schirmer", "Sonia G.", "" ], [ "Pullen", "Ivan C. H.", "" ], [ "Pemberton-Ross", "Peter J.", "" ] ]
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801.0722
Jeremy Clark
Jeremy Clark
An infinite-temperature limit for a quantum scattering process
18 pages
Rep. Math. Phys. 63 (2009) 131-152.
10.1016/S0034-4877(09)90009-X
null
math-ph math.MP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study a quantum dynamical semigroup driven by a Lindblad generator with a deterministic Schr\"odinger part and a noisy Poission-timed scattering part. The dynamics describes the evolution of a test particle in $\R^{n}$, $n=1,2,3$, immersed in a gas, and the noisy scattering part is defined by the reduced effect of an individual interaction, where the interaction between the test particle and a single gas particle is via a repulsive point potential. In the limit that the mass ratio $\lambda=\frac{m}{M}$ tends to zero and the collisions become more frequent as $\frac{1}{\lambda}$, we show that our dynamics $\Phi_{t,\lambda}$ approaches a limiting dynamics $\Phi_{t,\lambda}^{\diamond}$ with second order error. Working in the Heisenberg representation, for $G\in \Bi(L^{2}(\R^{n}))$ $n=1,3$ we bound the difference between $\Phi_{t,\lambda}(G)$ and $\Phi_{t,\lambda}^{\diamond}(G)$ in operator norm proportional to $\lambda^{2}$.
[ { "version": "v1", "created": "Fri, 4 Jan 2008 20:49:07 GMT" }, { "version": "v2", "created": "Thu, 31 Jul 2008 17:40:22 GMT" }, { "version": "v3", "created": "Fri, 12 Dec 2008 14:38:57 GMT" } ]
2015-05-13T00:00:00
[ [ "Clark", "Jeremy", "" ] ]
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801.0723
Ribhu Krishna Kaul
Ribhu K. Kaul and Subir Sachdev
Quantum criticality of U(1) gauge theories with fermionic and bosonic matter in two spatial dimensions
30 pages, 8 figures
Phys. Rev. B 77, 155105 (2008)
10.1103/PhysRevB.77.155105
null
cond-mat.str-el
null
We consider relativistic U(1) gauge theories in 2+1 dimensions, with N_b species of complex bosons and N_f species of Dirac fermions at finite temperature. The quantum phase transition between the Higgs and Coulomb phases is described by a conformal field theory (CFT). At large N_b and N_f, but for arbitrary values of the ratio N_b/N_f, we present computations of various critical exponents and universal amplitudes for these CFTs. We make contact with the different spin-liquids, charge-liquids and deconfined critical points of quantum magnets that these field theories describe. We compute physical observables that may be measured in experiments or numerical simulations of insulating and doped quantum magnets.
[ { "version": "v1", "created": "Fri, 4 Jan 2008 19:45:45 GMT" }, { "version": "v2", "created": "Sun, 6 Jan 2008 20:47:52 GMT" } ]
2008-04-07T00:00:00
[ [ "Kaul", "Ribhu K.", "" ], [ "Sachdev", "Subir", "" ] ]
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801.0724
Grigory Volovik
G.E. Volovik
Emergent physics: Fermi point scenario
16 pages, 8 figures, submitted to proceedings of Royal Society scientific discussion meeting "Cosmology meets condensed matter" held on 28 January 2008 in London, references added
Phil.Trans.Roy.Soc.Lond.A366:2935-2951,2008
10.1098/rsta.2008.0070
null
gr-qc cond-mat.str-el hep-ph
null
The Fermi-point scenario of emergent gravity has the following consequences: gravity emerges together with fermionic and bosonic matter; emergent fermionic matter consists of massless Weyl fermions; emergent bosonic matter consists of gauge fields; Lorentz symmetry persists well above the Planck energy; space-time is naturally 4-dimensional; Universe is naturally flat; cosmological constant is naturally small or zero; underlying physics is based on discrete symmetries; `quantum gravity' cannot be obtained by quantization of Einstein equations; there is no contradiction between quantum mechanics and gravity; etc.
[ { "version": "v1", "created": "Fri, 4 Jan 2008 19:40:01 GMT" }, { "version": "v2", "created": "Tue, 8 Jan 2008 11:11:04 GMT" }, { "version": "v3", "created": "Thu, 10 Jan 2008 10:54:19 GMT" }, { "version": "v4", "created": "Tue, 22 Jan 2008 14:31:55 GMT" }, { "version": "v5", "created": "Thu, 31 Jan 2008 15:19:42 GMT" } ]
2008-11-26T00:00:00
[ [ "Volovik", "G. E.", "" ] ]
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801.0725
Francois Renard
Sergei Zubtsov (LGIT), Fran\c{c}ois Renard (LGIT, PGP), Jean-Pierre Gratier (LGIT), Dag Dysthe (PGP), Vladimir Traskine
Single-contact pressure solution creep on calcite monocrystals
null
Deformation Mechanisms, Rheology and Tectonics: from Minerals to the Lithosphere, Geological Society of London (Ed.) (2005) 67_79
null
null
physics.geo-ph
null
Pressure solution creep rates and interface structures have been measured by two methods on calcite single crystals. In the first kind of experiments, calcite monocrystals were indented at 40 degrees C for six weeks using ceramic indenters under stresses in the 50-200 MPa range in a saturated solution of calcite and in a calcite-saturated aqueous solution of NH4Cl. The deformation (depth of the hole below the indenter) is measured ex-situ at the end of the experiment. In the second type of experiment, calcite monocrystals were indented by spherical glass indenters for 200 hours under stresses in the 0-100 MPa range at room temperature in a saturated aqueous solution of calcite. The displacement of the indenter was continuously recorded using a specially constructed differential dilatometer. The experiments conducted in a calcite-saturated aqueous solution of NH4Cl show an enhanced indentation rate owing to the fairly high solubility of calcite in this solution. In contrast, the experiments conducted in a calcite-saturated aqueous solution show moderate indentation rate and the dry control experiments did not show any measurable deformation. The rate of calcite indentation is found to be inversely proportional to the indenter diameter, thus indicating that the process is diffusion-controlled. The microcracks in the dissolution region under the indenter dramatically enhance the rate of calcite indentation by a significant reduction of the distance of solute transport in the trapped fluid phase. This result indicates that care should be taken in extrapolating the kinetic data of pressure solution creep from one mineral to another.
[ { "version": "v1", "created": "Fri, 4 Jan 2008 19:44:44 GMT" } ]
2008-01-07T00:00:00
[ [ "Zubtsov", "Sergei", "", "LGIT" ], [ "Renard", "François", "", "LGIT, PGP" ], [ "Gratier", "Jean-Pierre", "", "LGIT" ], [ "Dysthe", "Dag", "", "PGP" ], [ "Traskine", "Vladimir", "" ] ]
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801.0726
Gilles Pages
Gilles Pag\`es (PMA), Afef Sellami (PMA)
Convergence of multi-dimensional quantized $SDE$'s
43 pages
S\'eminaire de Probabilit\'es 2006 (Lecture Notes in Math.) (2011) 269-307
10.1007/978-3-642-15217-7_11
null
math.PR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We quantize a multidimensional $SDE$ (in the Stratonovich sense) by solving the related system of $ODE$'s in which the $d$-dimensional Brownian motion has been replaced by the components of functional stationary quantizers. We make a connection with rough path theory to show that the solutions of the quantized solutions of the $ODE$ converge toward the solution of the $SDE$. On our way to this result we provide convergence rates of optimal quantizations toward the Brownian motion for $\frac 1q$-H\" older distance, $q>2$, in $L^p(\P)$.
[ { "version": "v1", "created": "Fri, 4 Jan 2008 19:47:33 GMT" }, { "version": "v2", "created": "Tue, 6 Jul 2010 08:06:26 GMT" } ]
2013-04-03T00:00:00
[ [ "Pagès", "Gilles", "", "PMA" ], [ "Sellami", "Afef", "", "PMA" ] ]
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801.0727
Marc Bellon
Marc Bellon (LPTHE, Cefimas), Fidel A. Schaposnik (CEFIMAS)
Renormalization group functions for the Wess-Zumino model: up to 200 loops through Hopf algebras
Changed title, match the version to be published in Nucl. Phys. B 12 pages, 2 tables,
Nucl.Phys.A800:517-526,2008
10.1016/j.nuclphysb.2008.02.005
null
hep-th math-ph math.MP
null
We obtain the contributions to the renormalization group functions of all the diagrams containing the unique one-loop primitive divergence of a simple supersymmetric Wess--Zumino model, up to more than 200 loops. The asymptotic behavior of the coefficients in the expansion of the anomalous dimension is analyzed.
[ { "version": "v1", "created": "Fri, 4 Jan 2008 19:48:32 GMT" }, { "version": "v2", "created": "Thu, 28 Feb 2008 07:22:00 GMT" } ]
2009-11-13T00:00:00
[ [ "Bellon", "Marc", "", "LPTHE, Cefimas" ], [ "Schaposnik", "Fidel A.", "", "CEFIMAS" ] ]
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801.0728
Derrick Hart
David Covert, Derrick Hart, Alex Iosevich, Doowon Koh, Misha Rudnev
Generalized incidence theorems, homogeneous forms, and sum-product estimates in finite fields
null
null
null
null
math.CO math.CA
null
In recent years, sum-product estimates in Euclidean space and finite fields have been studied using a variety of combinatorial, number theoretic and analytic methods. Erdos type problems involving the distribution of distances, areas and volumes have also received much attention. In this paper we prove a relatively straightforward function version of an incidence results for points and planes previously established in \cite{HI07} and \cite{HIKR07}. As a consequence of our methods, we obtain sharp or near sharp results on the distribution of volumes determined by subsets of vector spaces over finite fields and the associated arithmetic expressions. In particular, our machinery enables us to prove that if $E \subset {\Bbb F}_q^d$, $d \ge 4$, the $d$-dimensional vector space over a finite field ${\Bbb F}_q$, of size much greater than $q^{\frac{d}{2}}$, and if $E$ is a product set, then the set of volumes of $d$-dimensional parallelepipeds determined by $E$ covers ${\Bbb F}_q$. This result is sharp as can be seen by taking $E$ to equal to $A \times A \times ... \times A$, where $A$ is a sub-field of ${\Bbb F}_q$ of size $\sqrt{q}$. In three dimensions we establish the same result if $|E| \gtrsim q^{{15/8}}$. We prove in three dimensions that the set of volumes covers a positive proportion of ${\Bbb F}_q$ if $|E| \ge Cq^{{3/2}}$. Finally we show that in three dimensions the set of volumes covers a positive proportion of ${\Bbb F}_q$ if $|E| \ge Cq^2$, without any further assumptions on $E$, which is again sharp as taking $E$ to be a 2-plane through the origin shows.
[ { "version": "v1", "created": "Fri, 4 Jan 2008 19:48:43 GMT" }, { "version": "v2", "created": "Mon, 31 Mar 2008 12:57:11 GMT" } ]
2008-03-31T00:00:00
[ [ "Covert", "David", "" ], [ "Hart", "Derrick", "" ], [ "Iosevich", "Alex", "" ], [ "Koh", "Doowon", "" ], [ "Rudnev", "Misha", "" ] ]
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801.0729
Richard J. Furnstahl
R.J. Furnstahl, G. Rupak, T. Schaefer
Effective Field Theory and Finite Density Systems
27 pages, 5 figures
Ann.Rev.Nucl.Part.Sci.58:1-25,2008
10.1146/annurev.nucl.58.110707.171142
null
nucl-th
null
This review gives an overview of effective field theory (EFT) as applied at finite density, with a focus on nuclear many-body systems. Uniform systems with short-range interactions illustrate the ingredients and virtues of many-body EFT and then the varied frontiers of EFT for finite nuclei and nuclear matter are surveyed.
[ { "version": "v1", "created": "Fri, 4 Jan 2008 19:53:47 GMT" } ]
2009-11-19T00:00:00
[ [ "Furnstahl", "R. J.", "" ], [ "Rupak", "G.", "" ], [ "Schaefer", "T.", "" ] ]
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801.073
Paul R. Anderson
Paul R. Anderson, Carmen Molina-Paris, David Evanich, and Gregory B. Cook
Study of the preheating phase of chaotic inflation
PRD version, some changes and corrections, 37 pages, 10 figures
Phys.Rev.D78:083514,2008
10.1103/PhysRevD.78.083514
null
hep-ph gr-qc hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Particle production and its effects on the inflaton field are investigated during the preheating phase of chaotic inflation using a model consisting of a massive scalar inflaton field coupled to N massless quantum scalar fields. The effects of spacetime curvature and interactions between the quantum fields are ignored. A large N expansion is used to obtain a coupled set of equations including a backreaction equation for the classical inflaton field. Previous studies of preheating using these equations have been done. Here the first numerical solutions to the full set of equations are obtained for various values of the coupling constant and the initial amplitude of the inflaton field. States are chosen so that initially the backreaction effects on the inflaton field are small and the mode equations for the quantum fields take the form of Mathieu equations. Potential problems relating to the parametric amplification of certain modes of the quantum fields are identified and resolved. A detailed study of the damping of the inflaton field is undertaken. Some predictions of previous studies are verified and some new results are obtained.
[ { "version": "v1", "created": "Fri, 4 Jan 2008 20:41:10 GMT" }, { "version": "v2", "created": "Wed, 9 Jan 2008 18:59:37 GMT" }, { "version": "v3", "created": "Tue, 14 Oct 2008 16:00:50 GMT" } ]
2008-11-07T00:00:00
[ [ "Anderson", "Paul R.", "" ], [ "Molina-Paris", "Carmen", "" ], [ "Evanich", "David", "" ], [ "Cook", "Gregory B.", "" ] ]
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801.0731
Nico Spronk
Ebrahim Samei, Nico Spronk, Ross Stokke
Biflatness and Pseudo-Amenability of Segal algebras
26 pages
Can. J. Math.-J. Can. Math. 62 (2010) 845-869
10.4153/CJM-2010-044-4
null
math.FA
null
We investigate generalized amenability and biflatness properties of various (operator) Segal algebras in both the group algebra, L1(G), and the Fourier algebra, A(G), of a locally compact group, G.
[ { "version": "v1", "created": "Fri, 4 Jan 2008 20:05:36 GMT" } ]
2019-08-15T00:00:00
[ [ "Samei", "Ebrahim", "" ], [ "Spronk", "Nico", "" ], [ "Stokke", "Ross", "" ] ]
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801.0732
Yan V. Fyodorov
Yan V Fyodorov
On statistical mechanics of a single particle in high-dimensional random landscapes
This is mainly a conference presentation summarizing results of arXiv:0706.3776; arXiv:0711.4006 and arXiv:cond-mat/0610035. The work in progress and some new results are briefly discussed in the last part
ACTA PHYSICA POLONICA B, vol. 38 (2007), pp. 4055-4066
null
null
cond-mat.dis-nn cond-mat.stat-mech
null
We discuss recent results of the replica approach to statistical mechanics of a single classical particle placed in a random N(>>1)-dimensional Gaussian landscape. The particular attention is paid to the case of landscapes with logarithmically growing correlations and to its recent generalisations. Those landscapes give rise to a rich multifractal spatial structure of the associated Boltzmann-Gibbs measure. We also briefly mention related results on counting stationary points of random Gaussian surfaces, as well as ongoing research on statistical mechanics in a random landscape constructed locally by adding many squared Gaussian-distributed terms.
[ { "version": "v1", "created": "Fri, 4 Jan 2008 20:07:09 GMT" } ]
2008-01-07T00:00:00
[ [ "Fyodorov", "Yan V", "" ] ]
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801.0733
Oded Hod
Noa Marom, Oded Hod, Gustavo E. Scuseria, and Leeor Kronik
Electronic Structure of Copper Phthalocyanine: a Comparative Density Functional Theory Study
18 pages, 4 Figure, 1 Table
null
10.1063/1.2898540
null
cond-mat.mtrl-sci
null
We present a systematic density functional theory study of the electronic structure of copper phthalocyanine (CuPc), using several different (semi)-local and hybrid functionals, and compare the results to experimental photoemission data. We show that semi-local functionals fail qualitatively for CuPc, primarily because of under-binding of localized orbitals due to self-interaction errors. We discuss an appropriate choice of functional for studies of CuPc/metal interfaces and suggest the Heyd-Scuseria-Ernzerhof screened hybrid functional as a suitable compromise functional.
[ { "version": "v1", "created": "Fri, 4 Jan 2008 20:15:05 GMT" } ]
2009-11-13T00:00:00
[ [ "Marom", "Noa", "" ], [ "Hod", "Oded", "" ], [ "Scuseria", "Gustavo E.", "" ], [ "Kronik", "Leeor", "" ] ]
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801.0734
Kevin Tucker
Kevin Tucker
Jumping Numbers on Algebraic Surfaces with Rational Singularities
Replaced Introduction, Includes Minor Revisions
null
null
null
math.AG
null
In this article, we study the jumping numbers of an ideal in the local ring at rational singularity on a complex algebraic surface. By understanding the contributions of reduced divisors on a fixed resolution, we are able to present an algorithm for finding of the jumping numbers of the ideal. This shows, in particular, how to compute the jumping numbers of a plane curve from the numerical data of its minimal resolution. In addition, the jumping numbers of the maximal ideal at the singular point in a Du Val or toric surface singularity are computed, and applications to the smooth case are explored.
[ { "version": "v1", "created": "Fri, 4 Jan 2008 20:35:42 GMT" }, { "version": "v2", "created": "Sun, 17 Feb 2008 19:10:40 GMT" } ]
2008-02-17T00:00:00
[ [ "Tucker", "Kevin", "" ] ]
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801.0735
John Friedman
John L. Friedman and Atsushi Higuchi
Topological censorship and chronology protection
Dedicated to Rafael Sorkin, whose tutoring and friendship from third grade on is responsible for one of us (JF) having spent his adult life in physics and whose work has inspired both of us. In v.2, some references are updated, and references are added to early work on 2+1 spacetimes and to work on event-horizon topology
AnnalenPhys.15:109-128,2006
10.1002/andp.200510172
null
gr-qc
null
Over the past two decades, substantial efforts have been made to understand the way in which physics enforces the ordinary topology and causal structure that we observe, from subnuclear to cosmological scales. We review the status of topological censorship and the topology of event horizons; chronology protection in classical and semiclassical gravity; and related progress in establishing quantum energy inequalities.
[ { "version": "v1", "created": "Fri, 4 Jan 2008 20:40:15 GMT" }, { "version": "v2", "created": "Tue, 3 Jun 2008 19:39:17 GMT" } ]
2008-11-26T00:00:00
[ [ "Friedman", "John L.", "" ], [ "Higuchi", "Atsushi", "" ] ]
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801.0736
John Franks
John Franks and Michael Handel
Global fixed points for centralizers and Morita's Theorem
null
Geom. Topol. 13 (2009) 87-98
10.2140/gt.2009.13.87
null
math.DS math.GT
null
We prove a global fixed point theorem for the centralizer of a homeomorphism of the two dimensional disk $D$ that has attractor-repeller dynamics on the boundary with at least two attractors and two repellers. As one application, we show that there is a finite index subgroup of the centralizer of a pseudo-Anosov homeomorphism with infinitely many global fixed points. As another application we give an elementary proof of Morita's Theorem, that the mapping class group of a closed surface $S$ of genus $g$ does not lift to the group of diffeormorphisms of $S$ and we improve the lower bound for $g$ from 5 to 3.
[ { "version": "v1", "created": "Fri, 4 Jan 2008 20:47:27 GMT" } ]
2014-11-11T00:00:00
[ [ "Franks", "John", "" ], [ "Handel", "Michael", "" ] ]
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801.0737
Alexander Katz
Alexander A. Katz and Oleg Friedman
On Existence and Uniqueness of Universal Enveloping Locally C*-Algebra for a Locally JB-Algebra
3 pages
null
null
null
math.OA math.FA
null
A theorem is presented on existence and uniqueness up to the topological *-isomorphism of universal locally C*-algebra for an arbitrary locally JB-algebra.
[ { "version": "v1", "created": "Fri, 4 Jan 2008 20:47:44 GMT" } ]
2008-01-07T00:00:00
[ [ "Katz", "Alexander A.", "" ], [ "Friedman", "Oleg", "" ] ]
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801.0738
Helen Wong
Helen Wong
Quantum invariants can provide sharp Heegaard genus bounds
8 pages
null
null
null
math.GT
null
Using Seifert fibered three-manifold examples of Boileau and Zieschang, we demonstrate that the Reshetikhin-Turaev quantum invariants may be used to provide a sharp lower bound on the Heegaard genus which is strictly larger than the rank of the fundamental group.
[ { "version": "v1", "created": "Sat, 5 Jan 2008 22:41:22 GMT" }, { "version": "v2", "created": "Tue, 15 Jan 2008 22:54:28 GMT" } ]
2008-01-16T00:00:00
[ [ "Wong", "Helen", "" ] ]
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801.0739
Zsolt Frei
Zoltan Lippai (1), Zsolt Frei (1), and Zoltan Haiman (2) ((1) Inst. of Physics, Eotvos University, Budapest, Hungary, (2) Dept. of Astronomy, Columbia University, New York, NY)
Prompt Shocks in the Gas Disk Around a Recoiling Supermassive Black Hole Binary
4 pages, 3 figures, submitted to ApJL
null
10.1086/587034
null
astro-ph gr-qc
null
Supermassive black hole binaries (BHBs) produced in galaxy mergers recoil at the time of their coalescence due to the emission of gravitational waves (GWs). We simulate the response of a thin, 2D disk of collisionless particles, initially on circular orbits around a 10^6 M_sun BHB, to kicks that are either parallel or perpendicular to the initial orbital plane. Typical kick velocities (v_k) can exceed the sound speed in a circumbinary gas disk. While the inner disk is strongly bound to the recoiling binary, the outer disk is only weakly bound or unbound. This leads to differential motions in the disturbed disk that increase with radius and can become supersonic at ~700 Schwarzschild radii for v_k ~500 km/s, implying that shocks form beyond this radius. We indeed find that kicks in the disk plane lead to immediate strong density enhancements (within weeks) in a tightly wound spiral caustic, propagating outward at the speed v_k. Concentric density enhancements are also observed for kicks perpendicular to the disk, but are weaker and develop into caustics only after a long delay (>1 year). Unless both BH spins are low or precisely aligned with the orbital angular momentum, a significant fraction (> several %) of kicks are sufficiently large and well aligned with the orbital plane for strong shocks to be produced. The shocks could result in an afterglow whose characteristic photon energy increases with time, from the UV (~10eV) to the soft X-ray (~100eV) range, between one month and one year after the merger. This could help identify EM counterparts to GW sources discovered by LISA.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 15:28:28 GMT" } ]
2009-11-13T00:00:00
[ [ "Lippai", "Zoltan", "" ], [ "Frei", "Zsolt", "" ], [ "Haiman", "Zoltan", "" ] ]
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801.074
Stefano Profumo
Stefano Profumo (UC Santa Cruz)
Non-thermal X-rays from the Ophiuchus galaxy cluster and dark matter annihilation
6 pages, 4 figures, matches published version
Phys.Rev.D77:103510,2008
10.1103/PhysRevD.77.103510
null
astro-ph hep-ph
null
We investigate a scenario where the recently discovered non-thermal hard X-ray emission from the Ophiuchus cluster originates from inverse Compton scattering of energetic electrons and positrons produced in weakly interacting dark matter pair annihilations. We show that this scenario can account for both the X-ray and the radio emission, provided the average magnetic field is of the order of 0.1 microGauss. We demonstrate that GLAST will conclusively test the dark matter annihilation hypothesis. Depending on the particle dark matter model, GLAST might even detect the monochromatic line produced by dark matter pair annihilation into two photons.
[ { "version": "v1", "created": "Fri, 4 Jan 2008 21:00:07 GMT" }, { "version": "v2", "created": "Wed, 14 May 2008 19:39:24 GMT" } ]
2008-11-26T00:00:00
[ [ "Profumo", "Stefano", "", "UC Santa Cruz" ] ]
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801.0741
Saskia Hekker
S. Hekker, I.A.G. Snellen, C. Aerts, A. Quirrenbach, S. Reffert, D.S. Mitchell
Precise radial velocities of giant stars. IV. A correlation between surface gravity and radial velocity variation and a statistical investigation of companion properties
10 pages, accepted by A&A
null
10.1051/0004-6361:20078321
null
astro-ph
null
Since 1999, we have been conducting a radial velocity survey of 179 K giants using the CAT at UCO/Lick observatory. At present ~20-100 measurements have been collected per star with a precision of 5 to 8 m/s. Of the stars monitored, 145 (80%) show radial velocity (RV) variations at a level >20 m/s, of which 43 exhibit significant periodicities. Our aim is to investigate possible mechanism(s) that cause these observed RV variations. We intend to test whether these variations are intrinsic in nature, or possibly induced by companions, or both. In addition, we aim to characterise the parameters of these companions. A relation between log g and the amplitude of the RV variations is investigated for all stars in the sample. Furthermore, the hypothesis that all periodic RV variations are caused by companions is investigated by comparing their inferred orbital statistics with the statistics of companions around main sequence stars. A strong relation is found between the amplitude of the RV variations and log g in K giant stars, as suggested earlier by Hatzes & Cochran (1998). However, most of the stars exhibiting periodic variations are located above this relation. These RV variations can be split in a periodic component which is not correlated with log g and a random residual part which does correlate with log g. Compared to main-sequence stars, K giants frequently exhibit periodic RV variations. Interpreting these RV variations as being caused by companions, the orbital param eters are different from the companions orbiting dwarfs. Intrinsic mechanisms play an important role in producing RV variations in K giants stars, as suggested by their dependence on log g. However, it appears that periodic RV variations are additional to these intrinsic variations, consistent with them being caused by companions.
[ { "version": "v1", "created": "Fri, 4 Jan 2008 21:09:00 GMT" } ]
2009-11-13T00:00:00
[ [ "Hekker", "S.", "" ], [ "Snellen", "I. A. G.", "" ], [ "Aerts", "C.", "" ], [ "Quirrenbach", "A.", "" ], [ "Reffert", "S.", "" ], [ "Mitchell", "D. S.", "" ] ]
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801.0742
Rachel Bean
Rachel Bean, Daniel J.H. Chung, and Ghazal Geshnizjani
Reconstructing a general inflationary action
16 pages, 1 figure, References added, typos corrected
Phys.Rev.D78:023517,2008
10.1103/PhysRevD.78.023517
null
astro-ph hep-ph hep-th
null
If inflation is to be considered in an unbiased way, as possibly originating from one of a wide range of underlying theories, then observations need not be simply applied to reconstructing the inflaton potential, V(\phi), or a specific kinetic term, as in DBI inflation, but rather to reconstruct the inflationary action in its entirety. We discuss the constraints that can be placed on a general single field action from measurements of the primordial scalar and tensor fluctuation power spectra and non-Gaussianities. We also present the flow equation formalism for reconstructing a general inflationary Lagrangian, L(X,\phi), with X={1/2}\partial_\mu\phi\partial^\mu\phi, in a general gauge, that reduces to canonical and DBI inflation in the specific gauge \partial L/\partial X = c_s^{-1}.
[ { "version": "v1", "created": "Fri, 4 Jan 2008 23:44:15 GMT" }, { "version": "v2", "created": "Tue, 8 Jan 2008 20:35:13 GMT" }, { "version": "v3", "created": "Wed, 2 Apr 2008 22:35:53 GMT" } ]
2008-12-18T00:00:00
[ [ "Bean", "Rachel", "" ], [ "Chung", "Daniel J. H.", "" ], [ "Geshnizjani", "Ghazal", "" ] ]
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801.0743
Iain W. Stewart
Ambar Jain, Ignazio Scimemi, Iain W. Stewart
Two-loop Jet-Function and Jet-Mass for Top Quarks
25 pages, some typos corrected in text and references; 1 figure replaced
Phys.Rev.D77:094008,2008
10.1103/PhysRevD.77.094008
MIT-CTP 3916
hep-ph hep-th nucl-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We compute the two-loop heavy quark jet-function in the heavy quark limit. This is one of the key ingredients in next-to-next-to-leading order (NNLO) and next-to-next-to-leading-log order (NNLL) computations of the invariant mass distribution of top-jets at a future e+e- collider. The shape of the top invariant mass distribution is affected by large logs which we compute at NNLL order. Exploiting the non-abelian exponentiation theorem, a definition of the top jet-mass is given which is transitive and whose renormalization group evolution is determined by the cusp-anomalous dimension to all orders in perturbation theory. Relations of the jet-mass to the pole, MSbar, and 1S masses are presented at two-loop order.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 20:43:32 GMT" }, { "version": "v2", "created": "Mon, 16 Jun 2008 15:11:03 GMT" } ]
2008-11-26T00:00:00
[ [ "Jain", "Ambar", "" ], [ "Scimemi", "Ignazio", "" ], [ "Stewart", "Iain W.", "" ] ]
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801.0744
Cenke Xu
Cenke Xu and Congjun Wu
Resonating plaquette phases in large spin cold atom systems
6 pages, 3 figures
Phys. Rev. B 77, 134449 (2008)
10.1103/PhysRevB.77.134449
null
cond-mat.str-el cond-mat.stat-mech
null
Large spin cold atom systems can exhibit novel magnetic properties which do not appear in usual spin-1/2 systems. We investigate the SU(4) resonating plaquette state in the three dimensional cubic optical lattice with spin-3/2 cold fermions. A novel gauge field formalism is constructed to describe the Rokhsar-Kivelson type of Hamiltonian and a duality transformation is used to study the phase diagram. Due to the proliferation of topological defects, the system is generally gapped for the whole phase diagram of the quantum model, which agrees with the recent numerical studies. A critical line is found for the classical plaquette system, which also corresponds to a quantum many-body wavefunction in a "plaquette liquid phase".
[ { "version": "v1", "created": "Fri, 4 Jan 2008 21:04:42 GMT" } ]
2009-11-13T00:00:00
[ [ "Xu", "Cenke", "" ], [ "Wu", "Congjun", "" ] ]
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801.0745
Anders Basboll
Anders Basboll
SUSY Flat Direction Decay - the prospect of particle production and preheating investigated in the unitary gauge
v2: particle production also possible with 1 flat direction, $QLQLQLE^c$ v3: 2 papers added to references and included in the discussion v4: typos corrected - in line with publication
Phys.Rev.D78:023528,2008
10.1103/PhysRevD.78.023528
null
hep-th astro-ph hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We look at the possibility of non-perturbative particle production after inflation from SUSY flat directions produced by rotating eigenstates thereby avoiding the standard adiabaticity conditions. This might lead to preheating and prevent the delay of thermalisation of the universe. We investigate the flat directions $LLE^c$ and $U^cD^cD^c$ and find no particle production. These 2 directions are very important, since they have been named as possible candidates for being the inflaton. We investigate $QLQLQLE^c$ and find particle production and therefore the possibility of preheating. We investigate the $LLE^c$ and $U^cD^cD^c$ directions appearing simultaneously, and find no production. Finally, we investigate $LLE^c$ and $QLD^c$ simultaneously - with one L-field in common. Here we do find particle production and therefore the possibility of preheating. This means that if SUSY flat directions are to delay thermalisation and thus explain the (lack of) gravitino production, it is necessary to explain why complicated directions as $QLQLQLE^c$ are not exited, and why combinations like $LLE^c$ and $QLD^c$ are not both exited.
[ { "version": "v1", "created": "Fri, 4 Jan 2008 21:09:14 GMT" }, { "version": "v2", "created": "Tue, 11 Mar 2008 19:09:58 GMT" }, { "version": "v3", "created": "Thu, 8 May 2008 08:32:26 GMT" }, { "version": "v4", "created": "Tue, 19 Aug 2008 09:18:51 GMT" }, { "version": "v5", "created": "Thu, 22 Apr 2010 11:31:54 GMT" } ]
2010-04-23T00:00:00
[ [ "Basboll", "Anders", "" ] ]
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801.0746
Sonia Schirmer
Sonia G Schirmer and Peter J Pemberton-Ross and Xiaoting Wang
Comparative Analysis of Control Strategies
This work is part of a more comprehensive analysis of control strategies, which has prompted further work such as our recent analysis of the Lyapunov method. It was originally presented at PhysCon2007 and has appeared in the Proceedings. Some figures are poor quality but the arXiv robot wouldn't accept the original figures. Online at: http://lib.physcon.ru/?item=1207
Proceedings of PhysCon2007, IPACS Electronic Library
null
null
quant-ph
null
Different ways of modelling quantum control systems, formulating control problems and solving the resulting problems are considered and compared. In particular, we compare the performance of geometric and optimal control, as well as iterative techniques for optimal control design versus local gradient optimization using a Lyapunov-type potential function for two problems of general interest: global control of qubits and entanglement generation in the form of Bell state preparation.
[ { "version": "v1", "created": "Fri, 4 Jan 2008 21:36:17 GMT" } ]
2008-01-08T00:00:00
[ [ "Schirmer", "Sonia G", "" ], [ "Pemberton-Ross", "Peter J", "" ], [ "Wang", "Xiaoting", "" ] ]
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801.0747
Ryo Suzuki
Yasuyuki Hatsuda, Ryo Suzuki
Finite-Size Effects for Dyonic Giant Magnons
1+45 pages, 10 figures, v2: references added, discussion in section 3.2 corrected, v3: references added, minor corrections, v4: published version, v5: Revised subsection 2.3, section 3 and some appendices to correct mistakes. Added the case 1 < Q << g
Nucl.Phys.B800:349-383,2008
10.1016/j.nuclphysb.2008.04.007
UT-07-41
hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We compute finite-size corrections to dyonic giant magnons in two ways. One is by examining the asymptotic behavior of helical strings of hep-th/0609026 as elliptic modulus k goes to unity, and the other is by applying the generalized Luscher formula for mu-term of arXiv:0708.2208 to the situation in which incoming particles are boundstates. By careful choice of poles in the su(2|2)^2-invariant S-matrix, we find agreement of the two results, which makes possible to predict the (leading) finite-size correction for dyonic giant magnons to all orders in the 't Hooft coupling.
[ { "version": "v1", "created": "Sun, 6 Jan 2008 12:58:17 GMT" }, { "version": "v2", "created": "Wed, 16 Jan 2008 19:10:54 GMT" }, { "version": "v3", "created": "Wed, 30 Jan 2008 14:24:45 GMT" }, { "version": "v4", "created": "Sun, 11 May 2008 13:54:00 GMT" }, { "version": "v5", "created": "Wed, 15 Oct 2008 14:25:46 GMT" } ]
2008-11-26T00:00:00
[ [ "Hatsuda", "Yasuyuki", "" ], [ "Suzuki", "Ryo", "" ] ]
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801.0748
Ester Pantaleo Dr.
N. Basalto, R. Bellotti, F. De Carlo, P. Facchi, E. Pantaleo, S. Pascazio
Hausdorff clustering
12 pages, 13 figures
Phys. Rev. E 78, 046112 (2008)
10.1103/PhysRevE.78.046112
null
q-fin.ST cond-mat.stat-mech physics.data-an physics.soc-ph
null
A clustering algorithm based on the Hausdorff distance is introduced and compared to the single and complete linkage. The three clustering procedures are applied to a toy example and to the time series of financial data. The dendrograms are scrutinized and their features confronted. The Hausdorff linkage relies of firm mathematical grounds and turns out to be very effective when one has to discriminate among complex structures.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 16:14:38 GMT" } ]
2010-01-30T00:00:00
[ [ "Basalto", "N.", "" ], [ "Bellotti", "R.", "" ], [ "De Carlo", "F.", "" ], [ "Facchi", "P.", "" ], [ "Pantaleo", "E.", "" ], [ "Pascazio", "S.", "" ] ]
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801.0749
Michael Scalora
D. de Ceglia, M.A. Vincenti, M.G. Cappeddu, M. Centini, N. Akozbek, A. DOrazio, J.W. Haus, M.J. Bloemer, M. Scalora
Tailoring Metallodielectric Structures for Super Resolution and Superguiding Applications in the Visible and Near IR Ranges
null
null
10.1103/PhysRevA.77.033848
null
physics.optics
null
We discuss propagation effects in realistic, transparent, metallo-dielectric photonic band gap structures in the context of negative refraction and super-resolution in the visible and near infrared ranges. In the resonance tunneling regime, we find that for transverse-magnetic incident polarization, field localization effects contribute to a waveguiding phenomenon that makes it possible for the light to remain confined within a small fraction of a wavelength, without any transverse boundaries, due to the suppression of diffraction. This effect is related to negative refraction of the Poynting vector inside each metal layer, balanced by normal refraction inside the adjacent dielectric layer: The degree of field localization and material dispersion together determine the total momentum that resides within any given layer, and thus the direction of energy flow. We find that the transport of evanescent wave vectors is mediated by the excitation of quasi-stationary, low group velocity surface waves responsible for relatively large losses. As representative examples we consider transparent metallo-dielectric stacks such as Ag/TiO2 and Ag/GaP and show in detail how to obtain the optimum conditions for high transmittance of both propagating and evanescent modes for super-guiding and super resolution applications across the visible and near IR ranges. Finally, we study the influence of gain on super-resolution. We find that the introduction of gain can compensate the losses caused by the excitation of surface plasmons, improves the resolving characteristics of the lens, and leads to gain-tunable super-resolution.
[ { "version": "v1", "created": "Fri, 4 Jan 2008 21:57:43 GMT" } ]
2009-11-13T00:00:00
[ [ "de Ceglia", "D.", "" ], [ "Vincenti", "M. A.", "" ], [ "Cappeddu", "M. G.", "" ], [ "Centini", "M.", "" ], [ "Akozbek", "N.", "" ], [ "DOrazio", "A.", "" ], [ "Haus", "J. W.", "" ], [ "Bloemer", "M. J.", "" ], [ "Scalora", "M.", "" ] ]
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801.075
EDA Publishing Association
P. Furjes, P. Csikvari, I. B\'arsony, Cs. Ducso
Micro-Hotplates for Thermal Characterisation of Structural Materials of Mems
Submitted on behalf of TIMA Editions (http://irevues.inist.fr/tima-editions)
Dans 13th International Worshop on THERMal INvestigations of ICs and Systems - THERMINIC 2007, Budapest : Hongrie (2007)
null
null
physics.gen-ph
null
Accurate knowledge of mechanical and thermal properties of structural materials used in MEMS is essential for optimum geometric and functional design. The extraction of precise physical properties is rather complicated due to the size effects, the complexity of the structures and the variations of formation processes. This work is intended to determine the thermal properties of silicon-nitride and diamond layers applied in thermal sensor structures by analyzing thermal responses of a multilayer micro-heater structure.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 16:15:31 GMT" } ]
2008-01-08T00:00:00
[ [ "Furjes", "P.", "" ], [ "Csikvari", "P.", "" ], [ "Bársony", "I.", "" ], [ "Ducso", "Cs.", "" ] ]
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801.0751
George M. Bergman
George M. Bergman
On lattices and their ideal lattices, and posets and their ideal posets
8 pages. Copy at http://math.berkeley.edu/~gbergman/papers may be updated more frequently than arXiv copy. After publication, updates, errata, etc. may be noted at that page
Tbilisi Math. J. 1 (2008) 89-103
null
null
math.RA math.CO
null
For P a poset or lattice, let Id(P) denote the poset, respectively, lattice, of upward directed downsets in P, including the empty set, and let id(P)=Id(P)-\{\emptyset\}. This note obtains various results to the effect that Id(P) is always, and id(P) often, "essentially larger" than P. In the first vein, we find that a poset P admits no "<"-respecting map (and so in particular, no one-to-one isotone map) from Id(P) into P, and, going the other way, that an upper semilattice S admits no semilattice homomorphism from any subsemilattice of itself onto Id(S). The slightly smaller object id(P) is known to be isomorphic to P if and only if P has ascending chain condition. This result is strengthened to say that the only posets P_0 such that for every natural number n there exists a poset P_n with id^n(P_n)\cong P_0 are those having ascending chain condition. On the other hand, a wide class of cases is noted here where id(P) is embeddable in P. Counterexamples are given to many variants of the results proved.
[ { "version": "v1", "created": "Fri, 4 Jan 2008 22:08:52 GMT" }, { "version": "v2", "created": "Fri, 9 May 2008 16:25:42 GMT" } ]
2013-05-10T00:00:00
[ [ "Bergman", "George M.", "" ] ]
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801.0752
Kim A. Venn
K.A. Venn, D.L. Lambert
Could the Ultra Metal-poor Stars be Chemically Peculiar and Not Related to the First Stars?
Accepted for ApJ. 17 pages, 10 figures
null
10.1086/529069
null
astro-ph
null
Chemically peculiar stars define a class of stars that show unusual elemental abundances due to stellar photospheric effects and not due to natal variations. In this paper, we compare the elemental abundance patterns of the ultra metal-poor stars with metallicities [Fe/H] $\sim -5 $ to those of a subclass of chemically peculiar stars. These include post-AGB stars, RV Tauri variable stars, and the Lambda Bootis stars, which range in mass, age, binarity, and evolutionary status, yet can have iron abundance determinations as low as [Fe/H] $\sim -5$. These chemical peculiarities are interpreted as due to the separation of gas and dust beyond the stellar surface, followed by the accretion of dust depleted-gas. Contrary to this, the elemental abundances in the ultra metal-poor stars are thought to represent yields of the most metal-poor supernova and, therefore, observationally constrain the earliest stages of chemical evolution in the Universe. The abundance of the elements in the photospheres of the ultra metal-poor stars appear to be related to the condensation temperature of that element; if so, then their CNO abundances suggest true metallicities of [X/H]~ -2 to -4, rather than their present metallicities of [Fe/H] < -5.
[ { "version": "v1", "created": "Fri, 4 Jan 2008 22:14:50 GMT" } ]
2009-11-13T00:00:00
[ [ "Venn", "K. A.", "" ], [ "Lambert", "D. L.", "" ] ]
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801.0753
Przemyslaw Biecek
Przemyslaw Biecek, Stanislaw Cebrat
Why Y chromosome is shorter and women live longer?
8 pages, 5 figures
Eur. Phys. J. B 65, 149-153 (2008)
10.1140/epjb/e2008-00325-4
null
q-bio.PE
null
We have used the Penna ageing model to analyze how the differences in evolution of sex chromosomes depend on the strategy of reproduction. In panmictic populations, when females (XX) can freely choose the male partner (XY) for reproduction from the whole population, the Y chromosome accumulates defects and eventually the only information it brings is a male sex determination. As a result of shrinking Y chromosome the males become hemizygous in respect to the X chromosome content and are characterized by higher mortality, observed also in the human populations. If it is assumed in the model that the presence of the male is indispensable at least during the pregnancy of his female partner and he cannot be seduced by another female at least during the one reproduction cycle - the Y chromosome preserves its content, does not shrink and the lifespan of females and males is the same. Thus, Y chromosome shrinks not because of existing in one copy, without the possibility of recombination, but because it stays under weaker selection pressure; in panmictic populations without the necessity of being faithful, a considerable fraction of males is dispensable and they can be eliminated from the population without reducing its reproduction potential.
[ { "version": "v1", "created": "Fri, 4 Jan 2008 22:27:20 GMT" } ]
2008-11-03T00:00:00
[ [ "Biecek", "Przemyslaw", "" ], [ "Cebrat", "Stanislaw", "" ] ]
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801.0754
Michael Bonitz
M. Bonitz, P. Ludwig, H. Baumgartner, C. Henning, A. Filinov, D. Block, O. Arp, A. Piel, S. Kading, Y. Ivanov, A. Melzer, H. Fehske, V. Filinov
Classical and quantum Coulomb crystals
19 pages, 6 figures
Physics of Plasmas 15, 055704 (2008)
10.1063/1.2839297
null
physics.plasm-ph
null
Strong correlation effects in classical and quantum plasmas are discussed. In particular, Coulomb (Wigner) crystallization phenomena are reviewed focusing on one-component non-neutral plasmas in traps and on macroscopic two-component neutral plasmas. The conditions for crystal formation in terms of critical values of the coupling parameters and the distance fluctuations and the phase diagram of Coulomb crystals are discussed.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 10:39:48 GMT" } ]
2009-09-29T00:00:00
[ [ "Bonitz", "M.", "" ], [ "Ludwig", "P.", "" ], [ "Baumgartner", "H.", "" ], [ "Henning", "C.", "" ], [ "Filinov", "A.", "" ], [ "Block", "D.", "" ], [ "Arp", "O.", "" ], [ "Piel", "A.", "" ], [ "Kading", "S.", "" ], [ "Ivanov", "Y.", "" ], [ "Melzer", "A.", "" ], [ "Fehske", "H.", "" ], [ "Filinov", "V.", "" ] ]
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801.0755
Alexander Retakh
Victor G. Kac, Alexander Retakh
Simple Jordan conformal superalgebras
null
null
null
null
math.QA math.RA
null
We classify simple finite Jordan conformal superalgebras and establish preliminary results for the classification of simple finite Jordan pseudoalgebras.
[ { "version": "v1", "created": "Fri, 4 Jan 2008 22:29:29 GMT" }, { "version": "v2", "created": "Tue, 6 May 2008 18:07:31 GMT" } ]
2008-05-06T00:00:00
[ [ "Kac", "Victor G.", "" ], [ "Retakh", "Alexander", "" ] ]
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801.0756
Nan Ma
Nan Ma, Prakash Ishwar
Distributed Source Coding for Interactive Function Computation
30 pages, 6 figures. This work has been submitted to the IEEE for possible publication. Parts of this work were presented at 2008 IEEE International Symposium on Information Theory (ISIT'08)
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A two-terminal interactive distributed source coding problem with alternating messages for function computation at both locations is studied. For any number of messages, a computable characterization of the rate region is provided in terms of single-letter information measures. While interaction is useless in terms of the minimum sum-rate for lossless source reproduction at one or both locations, the gains can be arbitrarily large for function computation even when the sources are independent. For a class of sources and functions, interaction is shown to be useless, even with infinite messages, when a function has to be computed at only one location, but is shown to be useful, if functions have to be computed at both locations. For computing the Boolean AND function of two independent Bernoulli sources at both locations, an achievable infinite-message sum-rate with infinitesimal-rate messages is derived in terms of a two-dimensional definite integral and a rate-allocation curve. A general framework for multiterminal interactive function computation based on an information exchange protocol which successively switches among different distributed source coding configurations is developed. For networks with a star topology, multiple rounds of interactive coding is shown to decrease the scaling law of the total network rate by an order of magnitude as the network grows.
[ { "version": "v1", "created": "Fri, 4 Jan 2008 22:37:47 GMT" }, { "version": "v2", "created": "Sun, 17 Feb 2008 22:59:24 GMT" }, { "version": "v3", "created": "Tue, 19 Feb 2008 22:31:24 GMT" }, { "version": "v4", "created": "Wed, 12 Nov 2008 22:20:42 GMT" } ]
2008-11-13T00:00:00
[ [ "Ma", "Nan", "" ], [ "Ishwar", "Prakash", "" ] ]
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801.0757
Jeetain Mittal
Jeetain Mittal, Thomas M. Truskett, Jeffrey R. Errington, Gerhard Hummer
Layering and position-dependent diffusive dynamics of confined fluids
null
Phys. Rev. Lett. 100, 145901 (2008)
10.1103/PhysRevLett.100.145901
null
cond-mat.soft cond-mat.stat-mech
null
We study the diffusive dynamics of a hard-sphere fluid confined between parallel smooth hard walls. The position-dependent diffusion coefficient normal to the walls is larger in regions of high local packing density. High density regions also have the largest available volume, consistent with the fast local diffusivity. Indeed, local and global diffusivities as a function of the Widom insertion probability approximately collapse onto a master curve. Parallel and average normal diffusivities are strongly coupled at high densities and deviate from bulk fluid behavior.
[ { "version": "v1", "created": "Fri, 4 Jan 2008 22:57:05 GMT" } ]
2009-11-13T00:00:00
[ [ "Mittal", "Jeetain", "" ], [ "Truskett", "Thomas M.", "" ], [ "Errington", "Jeffrey R.", "" ], [ "Hummer", "Gerhard", "" ] ]
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801.0758
Juan Pablo Paz
Ariel Bendersky, Fernando Pastawski and Juan Pablo Paz
Selective Efficient Quantum Process Tomography
4 pages
null
null
null
quant-ph
null
We present a new method for quantum process tomography. The method enables us to efficiently estimate, with fixed precision, any of the parameters characterizing a quantum channel. It is selective since one can choose to estimate the value of any specific set of matrix elements of the super-operator describing the channel. Also, we show how to efficiently estimate all the average survival probabilities associated with the channel (i.e., all the diagonal elements of its $\chi$--matrix.
[ { "version": "v1", "created": "Fri, 4 Jan 2008 23:07:24 GMT" } ]
2008-01-08T00:00:00
[ [ "Bendersky", "Ariel", "" ], [ "Pastawski", "Fernando", "" ], [ "Paz", "Juan Pablo", "" ] ]
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801.0759
Thomas M. Truskett
Gaurav Goel, William P. Krekelberg, Jeffrey R. Errington, and Thomas M. Truskett
Tuning density profiles and mobility of inhomogeneous fluids
5 pages, 3 figures
Physical Review Letters 100, 106001 (2008)
10.1103/PhysRevLett.100.106001
null
cond-mat.stat-mech cond-mat.soft
null
Density profiles are the most common measure of inhomogeneous structure in confined fluids, but their connection to transport coefficients is poorly understood. We explore via simulation how tuning particle-wall interactions to flatten or enhance the particle layering of a model confined fluid impacts its self-diffusivity, viscosity, and entropy. Interestingly, interactions that eliminate particle layering significantly reduce confined fluid mobility, whereas those that enhance layering can have the opposite effect. Excess entropy helps to understand and predict these trends.
[ { "version": "v1", "created": "Fri, 4 Jan 2008 23:28:55 GMT" } ]
2008-03-14T00:00:00
[ [ "Goel", "Gaurav", "" ], [ "Krekelberg", "William P.", "" ], [ "Errington", "Jeffrey R.", "" ], [ "Truskett", "Thomas M.", "" ] ]
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801.076
Fernando C. Lombardo
C. D. Fosco, F. C. Lombardo, and F. D. Mazzitelli
Casimir energies with finite-width mirrors
18 pages, no figures. Version to appear in Phys. Rev. D
Phys.Rev.D77:085018,2008
10.1103/PhysRevD.77.085018
null
hep-th hep-ph quant-ph
null
We use a functional approach to the Casimir effect in order to evaluate the exact vacuum energy for a real scalar field in $d+1$ dimensions, in the presence of backgrounds that, in a particular limit, impose Dirichlet boundary conditions on one or two parallel surfaces. Outside of that limit, the background may be thought of as describing finite-width mirrors with frequency-dependent transmission and reflection coefficients. We provide new explicit results for the Casimir energy in some particular backgrounds
[ { "version": "v1", "created": "Fri, 4 Jan 2008 23:34:21 GMT" }, { "version": "v2", "created": "Thu, 13 Mar 2008 13:42:49 GMT" } ]
2008-11-26T00:00:00
[ [ "Fosco", "C. D.", "" ], [ "Lombardo", "F. C.", "" ], [ "Mazzitelli", "F. D.", "" ] ]
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801.0761
Andrew Kerman
Andrew J. Kerman and William D. Oliver
High-fidelity quantum operations on superconducting qubits in the presence of noise
null
Phys. Rev. Lett. 101, 070501 (2008)
10.1103/PhysRevLett.101.070501
null
quant-ph cond-mat.supr-con physics.atom-ph
null
We present a scheme for implementing quantum operations with superconducting qubits. Our approach uses a "coupler" qubit to mediate a controllable, secular interaction between "data" qubits, pulse sequences which strongly mitigate the effects of 1/f flux noise, and a high-Q resonator-based local memory. We develop a Monte-Carlo simulation technique capable of describing arbitrary noise-induced dephasing and decay, and demonstrate in this system a set of universal gate operations with O(10^-5) error probabilities in the presence of experimentally measured levels of 1/f noise. We then add relaxation and quantify the decay times required to maintain this error level.
[ { "version": "v1", "created": "Sun, 6 Jan 2008 16:05:40 GMT" }, { "version": "v2", "created": "Wed, 19 Mar 2008 18:04:22 GMT" } ]
2013-10-22T00:00:00
[ [ "Kerman", "Andrew J.", "" ], [ "Oliver", "William D.", "" ] ]
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801.0762
Vasilis Niarchos
Adi Armoni, Dan Israel, Gregory Moraitis, Vasilis Niarchos
Non-Supersymmetric Seiberg Duality, Orientifold QCD and Non-Critical Strings
45 pages, 1 figure
Phys.Rev.D77:105009,2008
10.1103/PhysRevD.77.105009
null
hep-th
null
We propose an electric-magnetic duality and conjecture an exact conformal window for a class of non-supersymmetric U(N_c) gauge theories with fermions in the (anti)symmetric representation of the gauge group and N_f additional scalar and fermion flavors. The duality exchanges N_c with N_f -N_c \mp 4 leaving N_f invariant, and has common features with Seiberg duality in N=1 SQCD with SU or SO/Sp gauge group. At large N the duality holds due to planar equivalence with N=1 SQCD. At finite N we embed these gauge theories in a setup with D-branes and orientifolds in a non-supersymmetric, but tachyon-free, non-critical type 0B string theory and argue in favor of the duality in terms of boundary and crosscap state monodromies as in analogous supersymmetric situations. One can verify explicitly that the resulting duals have matching global anomalies. Finally, we comment on the moduli space of these gauge theories and discuss other potential non-supersymmetric examples that could exhibit similar dualities.
[ { "version": "v1", "created": "Mon, 7 Jan 2008 18:16:42 GMT" } ]
2008-11-26T00:00:00
[ [ "Armoni", "Adi", "" ], [ "Israel", "Dan", "" ], [ "Moraitis", "Gregory", "" ], [ "Niarchos", "Vasilis", "" ] ]
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801.0763
William Detmold
William Detmold and Martin J. Savage
The Energy of n Identical Bosons in a Finite Volume at O(L^{-7})
3 pages
Phys.Rev.D77:057502,2008
10.1103/PhysRevD.77.057502
NT@UW-08-01
hep-lat cond-mat.stat-mech nucl-th
null
The volume dependence of the ground-state energy of n identical bosons with short-range interactions in a periodic spatial volume with sides of length L is calculated at order L^{-7} in the large volume expansion. This result will enable a refined determination of the pi^+ pi^+ pi^+ interaction from lattice QCD calculations.
[ { "version": "v1", "created": "Sat, 5 Jan 2008 00:05:20 GMT" } ]
2008-11-26T00:00:00
[ [ "Detmold", "William", "" ], [ "Savage", "Martin J.", "" ] ]
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801.0764
Nour-Eddine Raouafi
N.-E. Raouafi, J. W. Harvey and C. J. Henney
On the Polar Field Distribution as Observed by SOLIS
8 pages, 3 figures
null
null
null
astro-ph
null
We use Vector Spectromagnetograph (VSM) chromospheric full-disk magnetograms, from the Synoptic Optical Long-term Investigations of the Sun (SOLIS) project, to study the distribution of magnetic field flux concentrations within the polar caps. We find that magnetic flux elements preferentially appear toward lower latitudes within the polar caps away from the poles. This has implications on numerous solar phenomena such as the formation and evolution of fine polar coronal structures (i.e., polar plumes). Our results also have implications for the processes carrying the magnetic flux from low to high latitudes (e.g., meridional circulation).
[ { "version": "v1", "created": "Sat, 5 Jan 2008 00:38:12 GMT" } ]
2008-01-08T00:00:00
[ [ "Raouafi", "N. -E.", "" ], [ "Harvey", "J. W.", "" ], [ "Henney", "C. J.", "" ] ]
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801.0765
Joel Berry
Joel Berry, K. R. Elder, and Martin Grant
Melting at dislocations and grain boundaries: A Phase Field Crystal study
4 pages, 3 figures
null
10.1103/PhysRevB.77.224114
null
cond-mat.mtrl-sci
null
Dislocation and grain boundary melting are studied in three dimensions using the Phase Field Crystal method. Isolated dislocations are found to melt radially outward from their core, as the localized excess elastic energy drives a power law divergence in the melt radius. Dislocations within low-to-mid angle grain boundaries melt similarly until an angle-dependent first order wetting transition occurs when neighboring melted regions coalesce. High angle boundaries are treated within a screening approximation, and issues related to ensembles, metastability, and grain size are discussed.
[ { "version": "v1", "created": "Sat, 5 Jan 2008 01:18:13 GMT" } ]
2009-11-13T00:00:00
[ [ "Berry", "Joel", "" ], [ "Elder", "K. R.", "" ], [ "Grant", "Martin", "" ] ]
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801.0766
Nour-Eddine Raouafi
N.-E. Raouafi and D. Tripathi
On the Relationship Between a CME Associated Waves Observed on 5 March 2000
8 pages, 4 figures
null
null
null
astro-ph
null
We study the relationship between different wave phenomena associated with a coronal mass ejection (CME) observed on 05 Mar. 2000. EIT waves were observed in the images recorded by EIT at 195 {\AA}. The white-light LASCO/C2 images show clear deflection and propagation of a kink along with the CME. Spectroscopic observations recorded by the UVCS reveals excessive line broadening in the two O {\sc{vi}} lines (1032 and 1037 {\AA}). Moreover very hot lines such as Si {\sc{xii}} and Mg {\sc{x}} were observed. Interestingly, the EIT wave, the streamer deflection and the intensity modulation along the slit were all propagating North-East. Spatial and temporal correlations show that the streamer deflection and spectral line broadening are highly likely to be due to a CME-driven shock wave and that the EIT wave is the signature of a CME-driven shock wave in the lower corona.
[ { "version": "v1", "created": "Sat, 5 Jan 2008 01:26:35 GMT" } ]
2008-01-08T00:00:00
[ [ "Raouafi", "N. -E.", "" ], [ "Tripathi", "D.", "" ] ]
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801.0767
Wolfgang Ziller
Karsten Grove and Wolfgang Ziller
Lifting Group Actions and Nonnegative Curvature
27 pages
null
null
null
math.DG
null
We show that all vector bundles over CP^2 which are not spin admit a complete metric with nonnegative sectional curvature. In the proof we construct a nonnegatively curved metric on the corresponding principle bundle by showing that it admits a cohomogeneity one action with singular orbits of codimension 2. This is closely related to the problem of when an action of G on the base of an L principle bundle lifts to the total space, such that the lift commutes with L. We solve this lifting problem for all SO(k) principle bundles over a 4-dimensional simply connected base B with G a cohomogeneity one action on B.
[ { "version": "v1", "created": "Sat, 5 Jan 2008 01:43:09 GMT" } ]
2008-01-08T00:00:00
[ [ "Grove", "Karsten", "" ], [ "Ziller", "Wolfgang", "" ] ]
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801.0768
Chang Qing Sun Dr
Chang Q. Sun
The strongest size in the inverse Hall-Petch relationship
null
null
null
null
cond-mat.mtrl-sci
null
Incorporating the bond-order-length-strength correlation mechanism [Sun CQ, Prog Solid State Chem 35, 1 -159 (2007)] and Borns criterion for melting [J. Chem. Phys. 7, 591(1939)] into the conventional Hall-Petch relationship has turned out an analytical expression for the size and temperature dependence of the mechanical strength of nanograins, known as the inverse Hall-Petch relationship (IHPR), that has long been a topic under debate regarding the possible mechanisms. Reproduction of the measured IHPR of Ni, NiP and TiO2 nanocrystals revealed that: (i) the size induced energy densification and cohesive energy loss of nanograins originates the IHPR that could be activated in the contact mode of plastic deformation detection; (ii) the competition between the inhibition of atomic dislocations, via the surface energy density gain and the strain work hardening, and the activation for dislocations through cohesive energy loss determine the entire IHPR profile of a specimen; (iii) the presence of a soft quasisolid phase is responsible for the size-induced softening and the superplasticity as well of nanostructures; (iv) the bond nature involved and the T/Tm ratio between the temperature of operating and the temperature of melting dictate the measured strongest sizes of a given specimen.
[ { "version": "v1", "created": "Sat, 5 Jan 2008 02:04:44 GMT" } ]
2008-01-08T00:00:00
[ [ "Sun", "Chang Q.", "" ] ]
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801.0769
Chang Qing Sun Dr
Chang Q. Sun
Thermally driven elastic weakening of crystals
null
null
null
null
cond-mat.mtrl-sci
null
An analytical solution has been developed clarifying that the thermally driven elastic softening of crystals can be directly related to the length and strength of the representative bonds of the crystal and to the response of the bonding identities to the change of temperature. Reproduction of the experimental results Ag, Au, MgO, Mg2SO4, Al2O3, and KCl derived mean atomic cohesive energy of the specimen may evidence the validity of the proposed approach without involving parameters using in classical thermodynamics.
[ { "version": "v1", "created": "Sat, 5 Jan 2008 02:09:42 GMT" } ]
2008-01-08T00:00:00
[ [ "Sun", "Chang Q.", "" ] ]
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801.077
Chang Qing Sun Dr
Chang Q. Sun
Pressure-stiffened Raman Phonons in Group III Nitrides
null
null
null
null
cond-mat.mtrl-sci
null
It has long been puzzling regarding the atomistic origin of the pressure-induced Raman phonon stiffening that generally follows a polynomial expression with coefficients needing physical indication. Here we show that an extension of the bond-order-length-strength (BOLS) correlation mechanism to the pressure domain has led to an analytical solution to connect the pressure-induced Raman phonon stiffening directly to the bonding identities of the specimen and the response of the bonding identities to the applied stimulus. It is found that the pressure-induced blue-shift of Raman phonons arises from the bond compression and energy storage exerted by the compressive stress. Agreement between predictions and experimental measurement leads to the detailed form for the polynomial coefficients, which offer an atomic understanding of the physical mechanism of the external pressure induced energy gain, thermally induced bond expansion as well as means of determining the mode atomic cohesive energy in a specimen.
[ { "version": "v1", "created": "Sat, 5 Jan 2008 02:17:21 GMT" } ]
2008-01-08T00:00:00
[ [ "Sun", "Chang Q.", "" ] ]
[ -0.0031447345, 0.0623736717, -0.0186947342, 0.0353053845, 0.0500924587, 0.0496458672, -0.0671372935, -0.1096625403, -0.058949817, -0.0943296328, 0.0788974836, 0.1011773348, -0.0529456697, -0.0166974869, 0.0094031906, -0.0635645762, 0.0469911434, 0.0026547266, -0.0463212579, -0.0225527715, 0.0278126039, -0.0742330998, -0.0423515737, -0.0629195049, -0.0274404455, 0.0475369729, -0.0119152563, 0.010594096, 0.1379465461, -0.1108534411, -0.0064011165, -0.0312612653, -0.0017584462, -0.0886232108, -0.0773592293, 0.1106549576, -0.0282591917, 0.028457677, -0.0795425549, 0.0012909229, 0.0021833265, -0.0692709982, -0.0431207009, 0.0506382883, 0.0073501193, 0.0401930586, -0.0075424006, -0.0003909597, -0.0248105284, 0.0413839631, -0.0286065396, -0.0531937741, 0.1531305909, -0.0011785001, -0.0144273229, 0.0051078675, 0.0462468266, 0.0924440324, -0.0587513335, 0.0283584353, 0.018558275, -0.2064235955, 0.0015266229, 0.0387292355, -0.0344370157, 0.007505185, -0.0763668045, 0.0526479408, 0.0511096902, 0.0823213384, 0.0742827207, -0.006866314, -0.0198980439, 0.0295493398, -0.0113260066, -0.0401930586, 0.0213742703, 0.0488519333, -0.0951235667, 0.0444356576, 0.0768133998, -0.04364172, 0.0194514543, -0.0997879505, -0.0578581542, 0.0125231147, -0.0484301522, -0.0374142788, -0.0499187857, -0.0792944506, 0.0421779007, -0.0017708516, -0.0459242873, 0.0492240898, -0.097951971, -0.043989066, 0.0186451133, 0.1126397997, 0.0084231747, -0.0216968078, 0.0104700429, 0.0062491521, 0.0489015542, -0.0045341244, 0.1427101642, 0.0521517321, -0.018161308, -0.0151964491, -0.0331468657, 0.0039665834, 0.1436033398, 0.0572130792, -0.1129375249, -0.0472640581, -0.0574611835, -0.0402923003, -0.0125665329, -0.0529456697, -0.1947130263, 0.0747293159, -0.0875315443, -0.0167471077, 0.0091054644, 0.0303184669, 0.0449070558, 0.0167595129, 0.0946769789, -0.0817755014, -0.0361489393, -0.0230613872, 0.088176623, -0.0522509739, 0.0786493793, -0.0282095708, -0.0327995196, -0.0269938558, 0.0486038253, 0.0333701633, 0.0851497352, -0.0047171018, 0.0455273204, 0.0237808917, 0.1032117978, -0.0063421912, 0.0717024282, 0.0997383296, 0.0494225733, 0.0111399274, 0.0177147184, -0.0374142788, -0.100730747, 0.0111833457, 0.064011164, 0.0390269607, 0.132091254, -0.1527336091, 0.0805349797, 0.0713054612, 0.049819544, -0.0023414937, 0.0260262452, 0.0029912193, 0.0203198232, 0.0177147184, 0.0404163525, 0.0248601492, -0.112540558, -0.0591483004, -0.0479339436, -0.1093648151, -0.0035820201, -0.0243763439, -0.063266851, 0.0257285181, 0.0432199426, 0.0927417576, 0.0488271192, -0.1609707177, -0.0395231731, 0.0208160337, 0.0838099644, -0.0380345397, 0.0418801717, 0.0070213797, -0.0239917822, 0.0073687271, -0.0684770569, 0.0467678457, -0.0405900255, 0.0226768237, -0.0084417826, 0.1318927705, 0.0526479408, 0.0571634583, -0.0093225567, -0.2300432175, 0.0000397841, 0.0245500188, -0.0267705601, -0.0093163541, 0.0033494213, -0.0316334255, 0.0137202227, -0.0461972058, -0.0748285577, -0.0596941337, -0.0140303541, 0.0763171837, -0.0690228939, 0.0367692038, 0.0322536863, 0.0423515737, 0.0979023501, 0.0372406058, -0.1244496107, 0.0534418784, -0.0306906234, 0.0311124027, 0.0347347409, 0.1123420745, 0.0269194245, -0.0352061391, 0.0618278384, 0.0695191026, 0.0274652559, 0.0835122392, 0.0052691363, -0.01114613, 0.0274900664, -0.0010916633, -0.0452047847, -0.0610835217, -0.0809815675, 0.1171057001, -0.0501917005, 0.0435672887, -0.0108670117, -0.0070461901, 0.0602895841, -0.1195867509, -0.0093349619, 0.0124300746, 0.0249221772, 0.072149016, -0.0050117266, 0.0671372935, -0.0530945323, -0.0330228135, 0.0545335412, 0.0072136614, 0.0419049822, 0.0519036278, 0.0214238912, -0.0416320674, -0.1441987902, -0.0071764453 ]
801.0771
Chang Qing Sun Dr
Chang Q. Sun
An approach to local band average for the temperature dependence of lattice thermal expansion
null
null
null
null
cond-mat.mtrl-sci
null
It has long been puzzling regarding the mechanism behind the nonlinearity of lattice thermal expansion at low temperatures despite modeling considerations from various perspectives in classical or quantum approximations. An analytical solution in terms of local bond average is presented herewith showing that the thermal expansion coefficient follows closely the specific heat of Debye approximation without the involvement of mode Gruneisen constant or the bulk modulus. Matching predictions to experimental observations using the Debye temperature and the atomic cohesive energy as input evidences that the current approach may represent the true situation of temperature induced lattice expansion though the exact form of phonon density of states need to be considered for further refinement.
[ { "version": "v1", "created": "Sat, 5 Jan 2008 02:26:19 GMT" } ]
2008-01-08T00:00:00
[ [ "Sun", "Chang Q.", "" ] ]
[ 0.0147633459, 0.0552165806, 0.0450685173, 0.0089177834, 0.0647807792, 0.0373115055, -0.0985335186, -0.1273373365, -0.1148816273, -0.0362271927, -0.0083964793, 0.0343643986, -0.0699521229, 0.0355877243, 0.0553277917, -0.0198373776, 0.0151525866, -0.0350316688, -0.0229234993, 0.030221764, -0.0077709137, -0.0668381974, 0.0497950129, -0.0374505222, 0.0009348729, -0.0055188779, -0.0074928845, 0.0415375493, 0.0756239146, -0.1128798202, 0.0372002944, -0.0144297108, -0.0155279255, -0.0572183914, -0.0589977764, 0.1017030478, 0.0043754829, 0.0700077266, -0.0015387173, -0.0577188432, -0.0475429781, -0.0878015906, -0.0829082802, 0.0555502176, -0.0043407297, -0.1228888631, -0.090415068, 0.0371168852, 0.0203100257, -0.0224369485, -0.0016203884, -0.0787378401, 0.138347283, -0.0725656003, -0.0623897314, 0.0432613306, 0.0017481081, 0.0274553746, 0.0212414246, -0.0537152253, -0.0145409219, -0.1305624694, -0.039702557, 0.0898034051, -0.065225631, 0.0236880798, -0.0676722825, -0.0318343341, -0.0131299244, 0.0878572017, -0.0650032088, -0.0360603742, 0.059720654, 0.0166678447, -0.0084868381, -0.0208799858, 0.0005391158, 0.0256898887, -0.0503232703, 0.1209982708, 0.0284979828, -0.0555224121, 0.0777925476, -0.0224647522, -0.0041843383, -0.0103843873, -0.0219225958, 0.0152081922, -0.0205463506, -0.0237297844, 0.0742893741, -0.0246750824, 0.0117050251, 0.066059716, 0.0277334042, -0.007611047, 0.0135261165, 0.0076527512, 0.0455411673, -0.0433447361, -0.0359491631, 0.0671718344, 0.0839091837, -0.0270939358, 0.1257803738, -0.0119691528, -0.0548273399, 0.0118162371, 0.0028428477, 0.0020574154, 0.0469035096, 0.0651144162, 0.0044032861, -0.066393353, -0.0651700199, -0.0473205559, -0.0307500195, -0.0697853044, -0.1172170714, 0.0682283416, -0.0472371466, 0.060443528, 0.0583305061, 0.0332800858, -0.0267185979, -0.0562452897, 0.0961980745, -0.0715090856, -0.1332315505, 0.0072913133, 0.1604783982, -0.0580524765, -0.0484882779, -0.0586085357, -0.0606103465, -0.055744838, 0.0257037915, 0.0250504222, 0.0565511212, -0.0613888279, 0.0613332205, 0.1093210429, 0.1007577479, 0.0217140727, 0.0508793257, 0.0627789721, 0.055411201, 0.0467088893, 0.0852437243, 0.0307500195, -0.0706193969, -0.0700077266, 0.0000084033, -0.0091402065, 0.1242234036, -0.1879476756, 0.1579205394, 0.0151942903, 0.0350872725, -0.0754014924, 0.0423160307, 0.0185584426, -0.0004157404, -0.0048655095, 0.065225631, 0.0944742933, -0.083019495, -0.0710642412, -0.0876903832, -0.1318970025, -0.0573852062, -0.0134566091, -0.0001323896, -0.0481268391, 0.0414541401, 0.038201198, 0.0140960757, -0.1724892557, -0.0728992298, 0.0359491631, 0.0535484068, -0.0500174351, 0.0209216904, -0.0628901869, 0.0231320225, -0.0037499175, -0.0516856126, 0.0543824919, 0.035837952, -0.0033189724, -0.0560506694, 0.078571029, 0.0621117018, 0.0450685173, -0.0455967747, -0.0866894722, 0.1189964563, 0.0213804375, 0.0650588125, 0.0116007645, 0.0196288545, -0.068172738, 0.0851325095, -0.0022781009, -0.1310073137, -0.0229791049, 0.0116007645, 0.0638354868, -0.0489887297, -0.0181414001, 0.0212553255, -0.0401195996, 0.0943630785, 0.0012354918, -0.0602767095, 0.0712310597, -0.0730104446, 0.003829851, 0.0422048196, 0.1619241536, -0.0095850537, 0.0347814411, 0.053186968, 0.1355669945, 0.003927161, 0.022840092, 0.0678947046, -0.0339751579, -0.0362828001, 0.0136025744, 0.0335859172, -0.0212275218, -0.0294988882, -0.0061096898, 0.0101341614, -0.0214082412, 0.0150413746, 0.0073469193, 0.067839101, -0.0882464424, -0.1059290916, 0.0175992418, 0.0161812939, 0.083019495, -0.0437895842, 0.0554390028, -0.1079865023, -0.057496421, 0.1563635767, 0.0204768442, -0.1005353257, 0.0411761105, 0.011183721, -0.087467961, -0.0651700199, 0.0118648922 ]
801.0772
Chang Qing Sun Dr
Chang Q. Sun
Nanocavity hardening: impact of broken bonds at the negatively curved surfaces
null
null
null
null
cond-mat.mes-hall
null
It is expected that atomic vacancies or nanometric cavities reduce the number of chemical bonds of nearby atoms and hence the strength of a voided solid. However, the hardness of a porous specimen does not always follow this simple picture of coordination counting. An introduction of a certain amount of atomic vacancies or nanocavities could, instead, enhance the mechanical strength of the porous specimen. Understanding the mechanism behind the intriguing observations remains yet a high challenge. Here we show with analytical expressions that the shortened and strengthened bonds between the under-coordinated atoms and the associated local strain and energy trapping [Sun, Prog Solid State Chem 35, 1-159 (2007)] in the negatively curved surface skins dominate the observed nanocavity hardening. Agreement between predictions and the experimentally observed size-dependence of mechanical strength of some nanoporous materials evidences for the proposed mechanism.
[ { "version": "v1", "created": "Sat, 5 Jan 2008 02:31:03 GMT" } ]
2008-01-08T00:00:00
[ [ "Sun", "Chang Q.", "" ] ]
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