Cosmic magnetic fields from velocity perturbations in the early Universe

Details Cosmic magnetic fields from velocity perturbations in the early Universe Cosmic magnetic fields from velocity perturbations in the early Universe

2003-10-16

arxiv.org/abs/gr-qc/0310085v2

Class.Quant.Grav.21:2115-2126,2004

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

11 pages, 1 figure, IOP style, minor changes and typos corrected

Scientific paper

10.1088/0264-9381/21/8/014

We show, using a covariant and gauge-invariant charged multifluid perturbation scheme, that velocity perturbations of the matter-dominated dust Friedmann-Lemaitre-Robertson-Walker (FLRW) model can lead to the generation of cosmic magnetic fields. Moreover, using cosmic microwave background (CMB) constraints, it is argued that these fields can reach strengths of between 10^{-28} and 10^{-29} G at the time the dynamo mechanism sets in, making them plausible seed field candidates.

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