Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-11-05
Mon.Not.Roy.Astron.Soc. 358 (2005) 892
Astronomy and Astrophysics
Astrophysics
10 pages, 4 figures, minor changes and corrected typos, added references compared to v1, version to appear in MNRAS
Scientific paper
10.1111/j.1365-2966.2005.08814.x
The magnetohydrodynamic dynamo equation is derived within general relativity, using the covariant 1+3 approach, for a plasma with finite electric conductivity. This formalism allows for a clear division and interpretation of plasma and gravitational effects, and we have not restricted to a particular spacetime geometry. The results should be of interest in astrophysics and cosmology, and the formulation is well suited to gauge invariant perturbation theory. Moreover, the dynamo equation is presented in some specific limits. In particular, we consider the interaction of gravitational waves with magnetic fields, and present results for the evolution of the linearly growing electromagnetic induction field, as well as the diffusive damping of these fields.
Clarkson Chris
Marklund Mattias
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