Homogeneous and isotropic cosmologies with nonlinear electromagnetic radiation

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dc.creatorVollick, Dan N.
dc.date2008-07-02
dc.date2008-11-18
dc.date.accessioned2026-07-07T12:14:53Z
dc.date.available2026-07-07T12:14:53Z
dc.descriptionIn this paper I examine cosmological models that contain a stochastic background of nonlinear electromagnetic radiation. I show that for Born-Infeld electrodynamics the equation of state parameter, $w=P/ρ$, remains close to 1/3 throughout the evolution of the universe if $E^2=B^2$ in the late universe to a high degree of accuracy. Theories with electromagnetic Lagrangians of the form $L=-{1/4}F^2+αF^4$ have recently been studied in magnetic universes, where the electric field vanishes. It was shown that the $F^4$ term can produce a bounce in the early universe, avoiding an initial singularity. Here I show that the inclusion of an electric field, with $E^2\simeq B^2$ in the late universe, eliminates the bounce and the universe "begins" in an initial singularity. I also examine theories with Lagrangians of the form $L=-{1/4}F^2-μ^8/F^2$, which have been shown to produce a period of late time accelerated expansion in magnetic universes. I show that, if an electric field is introduced, the accelerated phase will only occur if $E^2<3B^2$.
dc.description8 pages, change of title plus minor changes
dc.identifierhttps://arxiv.org/abs/0807.0448
dc.identifierhttp://arxiv.org/abs/0807.0448
dc.identifierPhys.Rev.D78:063524,2008
dc.identifierdoi:10.1103/PhysRevD.78.063524
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/211345
dc.subjectGeneral Relativity and Quantum Cosmology
dc.subjectAstrophysics
dc.subjectHigh Energy Physics - Theory
dc.titleHomogeneous and isotropic cosmologies with nonlinear electromagnetic radiation
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