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Shear and bulk viscosities of a photon gas at low temperature

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.

preprint2013arXivOpen access
Antonio DobadoFelipe J. Llanes-EstradaJuan M. Torres-Rincon
hep-phnucl-th
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Antonio DobadoFelipe J. Llanes-EstradaJuan M. Torres-Rincon

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