Large-scale magnetic fields from density perturbations

Details Large-scale magnetic fields from density perturbations Large-scale magnetic fields from density perturbations

2004-10-28

arxiv.org/abs/astro-ph/0410687v1

Phys.Rev. D71 (2005) 043502

Astronomy and Astrophysics

Astrophysics

7 pages, 1 figure

Scientific paper

10.1103/PhysRevD.71.043502

We derive the minimal seed magnetic field which unavoidably arises in the radiation and matter eras, prior to recombination, by the rotational velocity of ions and electrons, gravitationally induced by the non-linear evolution of primordial density perturbations. The resulting magnetic field power-spectrum is fully determined by the amplitude and spectral index of density perturbations. The rms amplitude of the seed-field at recombination is B ~ 10^{-23} (\lambda/Mpc)^{-2} G, on comoving scales larger than about 1 Mpc.

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