Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
2007-05-15
Int.J.Mod.Phys.A22:2197-2209,2007
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
7 pages, RevTex, 3 figures ps, accepted for publication to IJMPA
Scientific paper
10.1142/S0217751X07036415
We consider anisotropic magnetized cosmologies filled with conductive plasma fluid and study the implications of metric perturbations that propagate parallel to the ambient magnetic field. It is known that in the first order (linear) approximation with respect to the amplitude of the perturbations no electric field and density perturbations arise. However, when we consider the non-linear coupling of the metric perturbations with their temporal derivatives, certain classes of solutions can induce steeply increasing in time electric field perturbations. This is verified both numerically and analytically. The source of these perturbations can be either high-frequency quantum vacuum fluctuations, driven by the cosmological pump field, in the early stages of the evolution of the Universe or astrophysical processes or a non-linear isotropization process of an initially anisotropic cosmological spacetime.
Kleidis Kostas
Kuiroukidis Apostolos
Papadopoulos Demetrios B.
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