| Issue |
A&A
Volume 471, Number 2, August IV 2007
|
|
|---|---|---|
| Page(s) | 409 - 417 | |
| Section | Cosmology (including clusters of galaxies) | |
| DOI | https://doi.org/10.1051/0004-6361:20077109 | |
| Published online | 06 June 2007 | |
Excitation of MHD waves in magnetized anisotropic cosmologies
1
Department of Physics, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece e-mail: kleidis@astro.auth.gr
2
Department of Informatics, Technological Education Institute of Serres, 64124 Serres, Greece
3
Department of Civil Engineering, Technological Education Institute of Serres, 64124 Serres, Greece
Received:
16
January
2007
Accepted:
16
April
2007
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 saturate at high values, due to the resistivity. We also demonstrate that Jeans-like instabilities can be enhanced inside a resistive fluid and that the formation of condensations influence the growing magnetosonic waves.
Key words: magnetic fields / magnetohydrodynamics (MHD) / instabilities / waves / cosmology: early Universe / relativity
© ESO, 2007
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