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83 papers · 1 filter

astro-ph.CO2009★ 47 cited

PKS 2005-489 at VHE: Four Years of Monitoring with HESS and Simultaneous Multi-wavelength Observations

The HESS Collaboration, F. Acero

VHE observations of PKS 2005-489 were made with HESS from 2004 through 2007, together with three simultaneous multi-wavelength campaigns performed with XMM-Newton and RXTE in 2004…

hep-lat2009★ 3 cited

The Landau gauge gluon propagator in 4D SU(2) lattice gauge theory revisited: Gribov copies and scaling properties

I. L. Bogolubsky, E. -M. Ilgenfritz, M. Müller-Preussker +1

Lattice results for the gluon propagator in SU(2) pure gauge theory obtained on large lattices are presented. Simulated annealing is used throughout to fix the Landau gauge. We con…

hep-ph2009★ 63 cited

The nucleon's octet axial-charge g_A^8 with chiral corrections

Steven D. Bass, Anthony W. Thomas

The value of the nucleon's flavour-singlet axial-charge extracted from polarised deep inelastic scattering is sensitive to the value of the octet axial-charge g_A^8 which is usuall…

hep-lat2009★ 45 cited

Strong-coupling study of the Gribov ambiguity in lattice Landau gauge

Axel Maas, Jan M. Pawlowski, Daniel Spielmann +2

We study the strong-coupling limit beta=0 of lattice SU(2) Landau gauge Yang-Mills theory. In this limit the lattice spacing is infinite, and thus all momenta in physical units are…

math.DG2009★ 24 cited

On the local structure of Lorentzian Einstein manifolds with parallel distribution of null lines

Anton S. Galaev, Thomas Leistner

We study transformations of coordinates on a Lorentzian Einstein manifold with a parallel distribution of null lines and show that the general Walker coordinates can be simplified.…

math.DG2009★ 12 cited

Twisted Analytic Torsion

Varghese Mathai, Siye Wu

We review the Reidemeister torsion, Ray-Singer's analytic torsion and the Cheeger-M"uller theorem. We describe the analytic torsion of the de Rham complex twisted by a flux form in…

astro-ph.GA2009★ 72 cited

Localising the VHE gamma-ray source at the Galactic Centre

The HESS Collaboration, F. Acero

The inner 10 pc of our galaxy contains many counterpart candidates of the very high energy (VHE; > 100 GeV) gamma-ray point source HESS J1745-290. Within the point spread function…

math.DG2009★ 12 cited

The caloron correspondence and higher string classes for loop groups

Michael K. Murray, Raymond F. Vozzo

We review the caloron correspondence between -bundles on and -bundles on , where is the space of smooth loops in the compact Lie group . We use the…

math.ST2009★ 109 cited

Specification testing in nonlinear and nonstationary time series autoregression

Jiti Gao, Maxwell King, Zudi Lu +1

This paper considers a class of nonparametric autoregressive models with nonstationarity. We propose a nonparametric kernel test for the conditional mean and then establish an asym…

hep-ph2009★ 48 cited

Understanding the proton's spin structure

F. Myhrer, A. W. Thomas

We discuss the tremendous progress that has been towards an understanding of how the spin of the proton is distributed on its quark and gluon constituents. This is a problem that b…

hep-lat2009★ 43 cited

Recent results on nucleon sigma terms in lattice QCD

Ross D. Young, Anthony W. Thomas

It has proven a significant challenge to experiment and phenomenology to extract precise values of the nucleon sigma terms. This difficulty opens the window for lattice QCD simulat…

astro-ph.HE2009★ 66 cited

LUNASKA experiments using the Australia Telescope Compact Array to search for ultra-high energy neutrinos and develop technology for the lunar Cherenkov technique

C. W. James, R. D. Ekers, J. Alvarez-Muñiz +5

We describe the design, performance, sensitivity and results of our recent experiments using the Australia Telescope Compact Array (ATCA) for lunar Cherenkov observations with a ve…

astro-ph.CO2009★ 376 cited

An Upper Limit on the Stochastic Gravitational-Wave Background of Cosmological Origin

The LIGO Scientific Collaboration, the Virgo Collaboration

A stochastic background of gravitational waves is expected to arise from a superposition of a large number of unresolved gravitational-wave sources of astrophysical and cosmologica…

hep-lat2009

Role of the Wilson mass parameter in the overlap Dirac topological charge density

Peter J. Moran, Derek B. Leinweber, J. B. Zhang

The negative Wilson mass parameter is an input parameter to the overlap Dirac operator. We examine the extent to which the topological charge density, revealed by the overlap defin…

hep-lat2009★ 4 cited

Low-lying positive-parity excited states of the nucleon

M. S. Mahbub, Alan Ó Cais, Waseem Kamleh +3

We present an overview of the correlation-matrix methods developed recently by the CSSM Lattice Collaboration for the isolation of excited states of the nucleon. Of particular inte…

cs.CV2009★ 80 cited

Positive Semidefinite Metric Learning with Boosting

Chunhua Shen, Junae Kim, Lei Wang +1

The learning of appropriate distance metrics is a critical problem in image classification and retrieval. In this work, we propose a boosting-based technique, termed \BoostMetric,…

hep-lat2009★ 82 cited

Building the International Lattice Data Grid

G. Beckett, B. Joo, C. M. Maynard +3

We present the International Lattice Data Grid (ILDG), a loosely federated grid of grids for sharing data from Lattice Quantum Chromodynamics (LQCD) simulations. The ILDG comprises…

hep-lat2009★ 42 cited

Comparison of gluon flux-tube distributions for quark-diquark and quark-antiquark hadrons

F. Bissey, A. I. Signal, D. B. Leinweber

The distribution of gluon fields in hadrons is of fundamental interest in QCD. Using lattice QCD we have observed the formation of gluon flux tubes within 3 quark (baryon) and quar…

astro-ph.HE2009★ 219 cited

Detection of Gamma Rays From a Starburst Galaxy

The HESS Collaboration, F. Acero

Starburst galaxies exhibit in their central regions a highly increased rate of supernovae, the remnants of which are thought to accelerate energetic cosmic rays up to energies of ~…

astro-ph.HE2009★ 164 cited

Searches for gravitational waves from known pulsars with S5 LIGO data

The LIGO Scientific Collaboration, The Virgo Collaboration, B. P. Abbott +678

We present a search for gravitational waves from 116 known millisecond and young pulsars using data from the fifth science run of the LIGO detectors. For this search ephemerides ov…

quant-ph2009★ 27 cited

Constructing quantum games from a system of Bell's inequalities

Azhar Iqbal, Derek Abbott

We report constructing quantum games directly from a system of Bell's inequalities using Arthur Fine's analysis published in early 1980s. This analysis showed that such a system of…

astro-ph.HE2009★ 12 cited

Search for VHE gamma rays from SS433/W50 with the CANGAROO-II telescope

Sei. Hayashi, F. Kajino, T. Naito +48

SS433, located at the center of the supernova remnant W50, is a close proximity binary system consisting of a compact star and a normal star. Jets of material are directed outwards…

hep-lat2009★ 10 cited

SU(2) lattice gauge theory in 2+1 dimensions: critical couplings from twisted boundary conditions and universality

Sam Edwards, Lorenz von Smekal

We present a precision determination of the critical coupling beta_c for the deconfinement transition in pure SU(2) gauge theory in 2+1 dimensions. This is possible from universali…

hep-lat2009★ 3 cited

Stout-link smearing in lattice fermion actions

J. B. Zhang, Peter J. Moran, Patrick O. Bowman +2

The properties of the momentum space quark propagator in Landau gauge are studied for the overlap quark action in quenched lattice QCD. Numerical calculations are performed over fo…