The Bulk Viscosity of a Pion Gas

Details The Bulk Viscosity of a Pion Gas The Bulk Viscosity of a Pion Gas

2011-01-31

arxiv.org/abs/1102.0017v1

Phys.Rev.C83:044901,2011

Physics

High Energy Physics

High Energy Physics - Phenomenology

13 pages, two figures

Scientific paper

10.1103/PhysRevC.83.044901

We compute the bulk viscosity of a gas of pions at temperatures below the QCD crossover temperature, for the physical value of pion mass, to lowest order in chiral perturbation theory. Bulk viscosity is controlled by number-changing processes which become exponentially slow at low temperatures when the pions become exponentially dilute, leading to an exponentially large bulk viscosity zeta ~ (F_0^8/m_\pi^5) exp(2m_\pi/T), where F_0 = 93 MeV is the pion decay constant.

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