Bulk Viscosity of a Gas of Massless Pions

Details Bulk Viscosity of a Gas of Massless Pions Bulk Viscosity of a Gas of Massless Pions

2007-11-30

arxiv.org/abs/0711.4824v3

Phys.Rev.C79:044913,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pages, 1 figure; the version to appear in PRC

Scientific paper

10.1103/PhysRevC.79.044913

In the hadronic phase, the dominant configuration of QCD with two flavors of massless quarks is a gas of massless pions. We calculate the bulk viscosity (zeta) using the Boltzmann equation with the kinetic theory generalized to incorporate the trace anomaly. We find that the dimensionless ratio zeta/s, s being the entropy density, is monotonic increasing below T=120 MeV, where chiral perturbation theory is applicable. This, combined with previous results, shows that zeta/s reaches its maximum near the phase transition temperature Tc, while eta/s, eta being the shear viscosity, reaches its minimum near Tc in QCD with massless quarks.

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