de Broglie-Proca and Bopp-Podolsky massive photon gases in cosmology

• Autor(a) principal: Cuzinatto, R. R.
• Data de Publicação: 2017
• Outros Autores: Morais, E. M. de, Medeiros, L. G. [UNESP], Naldoni de Souza, C., Pimentel, B. M. [UNESP]
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://dx.doi.org/10.1209/0295-5075/118/19001; http://hdl.handle.net/11449/162982

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