Wednesday, July 3, 2013

1307.0476 (Antonio Dobado et al.)

Shear and bulk viscosities of a photon gas at low temperature    [PDF]

Antonio Dobado, Felipe J. Llanes-Estrada, Juan M. Torres-Rincon
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.
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