Bulk viscosity and spectral functions in QCD

Details Bulk viscosity and spectral functions in QCD Bulk viscosity and spectral functions in QCD

2008-05-27

arxiv.org/abs/0805.4201v2

JHEP 0809:015,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

15 pages with 5 figures. Clarified discussion, published version

Scientific paper

10.1088/1126-6708/2008/09/015

We examine the behavior of the spectral function for the trace of the stress tensor in QCD in the two regimes where it is possible to make analytical progress; weak coupling, and close to a second order QCD phase transition. We determine the behavior of the bulk viscosity in each regime. We discuss the problem of analytic continuation of the (lattice) Euclidean correlation function to determine the spectral function. In each case the spectral function has a narrow peak at small frequency; its shape would be challenging to extract accurately from lattice data with error bars.

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