Journal
ASTRONOMISCHE NACHRICHTEN
Volume 331, Issue 1, Pages 110-120Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/asna.200911312
Keywords
cosmology: theory; magnetic fields
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We give a pedagogical introduction to two aspects of magnetic fields in the early Universe. We first focus on how to formulate electrodynamics in curved space time, defining appropriate magnetic and electric fields and writing Maxwell equations in terms of these fields. We then specialize to the case of magnetohydrodynamics in the expanding Universe. We emphasize the usefulness of tetrads in this context. We then review the generation of magnetic fields during the inflationary era, deriving in detail the predicted magnetic and electric spectra for some models. We discuss potential problems arising from back reaction effects and from the large variation of the coupling constants required for such field generation. (C) 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
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