%0 Journal Article
%T Shear and bulk viscosities of a photon gas at low temperature
%A Antonio Dobado
%A Felipe J. Llanes-Estrada
%A Juan M. Torres-Rincon
%J Physics
%D 2013
%I arXiv
%R 10.1103/PhysRevD.88.053006
%X We explore the viscosities of a photon gas by means of the Euler-Heisenberg effective theory and quantum electrodynamics at zero electron chemical potential. We find parametric estimates that show a very large shear viscosity and an extremely small bulk viscosity (reflecting the very weak coupling simultaneously with a very approximate dilatation invariance). The system is of some interest because it exemplifies very neatly the influence of the breaking of scale invariance on the bulk viscosity.
%U http://arxiv.org/abs/1307.0476v2