Gauge-invariant magnetic perturbations in perfect-fluid cosmologies

Details Gauge-invariant magnetic perturbations in perfect-fluid cosmologies Gauge-invariant magnetic perturbations in perfect-fluid cosmologies

1998-03-09

arxiv.org/abs/gr-qc/9803032v2

Class.Quant.Grav. 15 (1998) 3523-3544

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

Revised version (some minor changes - few equations added). 26 pages. No figures. To appear in Classical and Quantum Gravity

Scientific paper

10.1088/0264-9381/15/11/016

We develop further our extension of the Ellis-Bruni covariant and gauge-invariant formalism to the general relativistic treatment of density perturbations in the presence of cosmological magnetic fields. We present detailed analysis of the kinematical and dynamical behaviour of perturbed magnetized FRW cosmologies containing fluid with non-zero pressure. We study the magnetohydrodynamical effects on the growth of density irregularities during the radiation era. Solutions are found for the evolution of density inhomogeneities on small and large scales in the presence of pressure, and some new physical effects are identified.

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