Bulk viscosity of QCD matter near the critical temperature

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Published 18 September 2008 • Published under licence by IOP Publishing Ltd
, , Citation Dmitri Kharzeev and Kirill Tuchin JHEP09(2008)093 DOI 10.1088/1126-6708/2008/09/093

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Author affiliations

1 Department of Physics, Brookhaven National Laboratory, Upton, New York 11973-5000, U.S.A.

2 Department of Physics and Astronomy, Iowa State University, Ames, Iowa, 50011, U.S.A.

3 RIKEN BNL Research Center, Upton, New York 11973-5000, U.S.A.

Dates

  1. Received 16 May 2008
  2. Accepted 9 September 2008
  3. Published

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1126-6708/2008/09/093

Abstract

Kubo's formula relates bulk viscosity to the retarded Green's function of the trace of the energy-momentum tensor. Using low energy theorems of QCD for the latter we derive the formula which relates the bulk viscosity to the energy density and pressure of hot matter. We then employ the available lattice QCD data to extract the bulk viscosity as a function of temperature. We find that close to the deconfinement temperature bulk viscosity becomes large, with viscosity-to-entropy ratio ζ/s ∼ 1.

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10.1088/1126-6708/2008/09/093