Excitation of MHD waves in magnetized anisotropic cosmologies

Details Excitation of MHD waves in magnetized anisotropic cosmologies Excitation of MHD waves in magnetized anisotropic cosmologies

2007-05-15

arxiv.org/abs/0705.2194v1

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

12 pages, RevTex, 5 figures ps, accepted for publication to Astronomy and Astrophysics

Scientific paper

10.1051/0004-6361:20077109

The excitation of cosmological perturbations in an anisotropic cosmological model and in the presence of a homogeneous magnetic field was studied, using the resistive magnetohydrodynamic (MHD) equations. We have shown that fast-magnetosonic modes, propagating normal to the magnetic field grow exponentially and saturated at high values, due to the resistivity. We also demonstrate that the jeans-like instabilities are enhanced inside a resistive and the formation of condensations formed within an anisotropic fluid influence the growing magnetosonic waves.

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