Bulk viscosity and the conformal anomaly in the pion gas

Details Bulk viscosity and the conformal anomaly in the pion gas Bulk viscosity and the conformal anomaly in the pion gas

2008-09-26

arxiv.org/abs/0809.4663v2

Phys.Rev.Lett.102:121601,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

Revised version accepted in Phys.Rev.Lett. 4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.102.121601

We calculate the bulk viscosity of the massive pion gas within Unitarized Chiral Perturbation Theory. We obtain a low temperature peak arising from explicit conformal breaking due to the pion mass and another peak near the critical temperature, dominated by the conformal anomaly through gluon condensate terms. The correlation between bulk viscosity and conformal breaking supports a recent QCD proposal. We discuss the role of resonances, heavier states and large-$N_c$ counting.

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