Excitation of MHD waves in magnetized anisotropic cosmologies
Department of Physics, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece e-mail: firstname.lastname@example.org
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
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