Dynamo effects in magnetized ideal-plasma cosmologies

Details Dynamo effects in magnetized ideal-plasma cosmologies Dynamo effects in magnetized ideal-plasma cosmologies

2007-12-27

arxiv.org/abs/0712.4239v1

Int.J.Mod.Phys.A23:1697-1710,2008

Astronomy and Astrophysics

Astrophysics

7 pages, RevTex, accepted for publication to IJMP A

Scientific paper

10.1142/S0217751X08039542

The excitation of cosmological perturbations in an anisotropic cosmological model and in the presence of a homogeneous magnetic field has been studied, using the ideal magnetohydrodynamic (MHD) equations. In this case, the system of partial differential equations which governs the evolution of the magnetized cosmological perturbations can be solved analytically. Our results verify that fast-magnetosonic modes propagating normal to the magnetic field, are excited. But, what's most important, is that, at late times, the magnetic-induction contrast grows, resulting in the enhancement of the ambient magnetic field. This process can be particularly favored by condensations, formed within the plasma fluid due to gravitational instabilities.

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