Publications by authors named "Chris Allton"

3 Publications

  • Page 1 of 1

Electrical conductivity of the quark-gluon plasma across the deconfinement transition.

Phys Rev Lett 2013 Oct 23;111(17):172001. Epub 2013 Oct 23.

Department of Physics, College of Science, Swansea University, Swansea SA2 8PP, United Kingdom and Institute for Theoretical Physics, Universität Regensburg, D-93040 Regensburg, Germany.

A lattice calculation is presented for the electrical conductivity σ of the QCD plasma with 2+1 dynamical flavors at nonzero temperature. We employ the conserved lattice current on anisotropic lattices using a tadpole-improved clover action and study the behavior of the conductivity over a wide range of temperatures, both below and above the deconfining transition. The conductivity is extracted from a spectral-function analysis using the maximal entropy method, and a discussion of its systematics is provided. We find an increase of σ/T across the transition.
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http://dx.doi.org/10.1103/PhysRevLett.111.172001DOI Listing
October 2013

Building a scientific data grid with DiGS.

Philos Trans A Math Phys Eng Sci 2009 Jun;367(1897):2471-81

School of Physics and Astronomy, University of Edinburgh, Edinburgh EH9 3JZ, UK.

We provide an insight into the challenge of building and supporting a scientific data infrastructure with reference to our experience working with scientists from computational particle physics and molecular biology. We illustrate how, with modern high-performance computing resources, even small scientific groups can generate huge volumes (petabytes) of valuable scientific data and explain how grid technology can be used to manage, publish, share and curate these data. We describe the DiGS software application, which we have developed to meet the needs of smaller communities and we have highlighted the key elements of its functionality.
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http://dx.doi.org/10.1098/rsta.2009.0050DOI Listing
June 2009

Spectral functions at small energies and the electrical conductivity in hot quenched lattice QCD.

Phys Rev Lett 2007 Jul 13;99(2):022002. Epub 2007 Jul 13.

Department of Physics, Swansea University, Swansea SA2 8PP, United Kingdom.

In lattice QCD, the maximum entropy method can be used to reconstruct spectral functions from Euclidean correlators obtained in numerical simulations. We show that at finite temperature the most commonly used algorithm, employing Bryan's method, is inherently unstable at small energies and gives a modification that avoids this. We demonstrate this approach using the vector current-current correlator obtained in quenched QCD at finite temperature. Our first results indicate a small electrical conductivity above the deconfinement transition.
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http://dx.doi.org/10.1103/PhysRevLett.99.022002DOI Listing
July 2007
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