Generation of large scale magnetic fields at recombination epoch

Details Generation of large scale magnetic fields at recombination epoch Generation of large scale magnetic fields at recombination epoch

2003-05-30

arxiv.org/abs/astro-ph/0305595v2

Astropart.Phys.21:59-69,2004

Astronomy and Astrophysics

Astrophysics

20 pages, latex; some explanatory comments and one reference are added

Scientific paper

10.1016/j.astropartphys.2003.11.

It is argued that large scale cosmic magnetic field could be generated in the primeval plasma slightly before hydrogen recombination. Non-zero vorticity, necessary for that, might be created by the photon diffusion in the second order in the temperature fluctuations. The resulting seed fields at galactic scale would be only 4 orders of magnitude smaller than the observed ones and with a mild galactic dynamo amplifying the seed fields by the factor $\sim 10^4$ an existence of coherent magnetic fields in galaxies may be explained.

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