de Broglie-Proca and Bopp-Podolsky massive photon gases in cosmology
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Iop Publishing Ltd
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Acesso aberto
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Abstract
We investigate the influence of massive photons on the evolution of the expanding universe. Two particular models for generalized electrodynamics are considered, namely de BroglieProca and Bopp-Podolsky electrodynamics. We obtain the equation of state (EOS) P = P(epsilon) for each case using dispersion relations derived from both theories. The EOS are inputted into the Friedmann equations of a homogeneous and isotropic space-time to determine the cosmic scale factor a(t). It is shown that the photon non-null mass does not significantly alter the result a alpha t (1/ 2) valid for a massless photon gas; this is true either in de Broglie-Proca's case (where the photon mass m is extremely small) or in Bopp-Podolsky theory (for which m is extremely large). Copyright (C) EPLA, 2017
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English
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Epl. Bristol: Iop Publishing Ltd, v. 118, n. 1, 7 p., 2017.
