Report on: The Bulk Viscosity of a Pion Gas

by Sourendu Gupta

Friday 4 Feb 2011, 11:30 → 12:30 Asia/Kolkata

A-304 (Colaba Campus)

Authors: Egang Lu, Guy D. Moore Abstract: 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.

Paper http://arxiv.org/abs/1102.0017