The Bulk Viscosity of a Pion Gas
arXiv:1102.0017 · doi:10.1103/PhysRevC.83.044901
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_π^5) exp(2m_π/T), where F_0 = 93 MeV is the pion decay constant.
13 pages, two figures
References in corpus (5)
- Viscosity Information from Relativistic Nuclear Collisions: How Perfect is the Fluid Observed at RHIC?
- The QCD equation of state with dynamical quarks
- Equation of state and QCD transition at finite temperature
- On the Strongly-Interacting Low-Viscosity Matter Created in Relativistic Nuclear Collisions
- Bulk viscosity of QCD matter near the critical temperature