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oai:docta.ucm.es:20.500.14352/333832024-09-04T14:05:19Zcom_20.500.14352_14col_20.500.14352_15

Shear and bulk viscosities of a photon gas at low temperature Llanes Estrada, Felipe José Dobado González, Antonio Torres Rincón, Juan Miguel © 2013 American Physical Society. We thank useful conversations with T. Schaefer. This work was supported by Spanish Grants No. FPA2010-16963 and No. FPA2011-27853-C02-01. J.M.T.-R. is funded by Grant No. FP7 PEOPLE-2011-CIG under Contract No. PCIG09-GA-2011-291679. 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. 2023-06-19T13:22:19Z 2023-06-19T13:22:19Z 2013-09-12 journal article 1550-7998 10.1103/PhysRevD.88.053006 https://hdl.handle.net/20.500.14352/33383 http://dx.doi.org/10.1103/PhysRevD.88.053006 http://prd.aps.org eng FPA2011-27853-C02-01 FP7-PEOPLE-2011-CIG PCIG09-GA-2011-291679 FPA2010-16963 open access American Physical Society