Cosmological Magnetic Fields from Primordial Helical Seeds

Details Cosmological Magnetic Fields from Primordial Helical Seeds Cosmological Magnetic Fields from Primordial Helical Seeds

2002-02-22

arxiv.org/abs/astro-ph/0202424v1

Phys.Rev. D66 (2002) 123002

Astronomy and Astrophysics

Astrophysics

4 revtex pages, 2 postscript figures included

Scientific paper

10.1103/PhysRevD.66.123002

Most early Universe scenarios predict negligible magnetic fields on cosmological scales if they are unprocessed during subsequent expansion of the Universe. We present a new numerical treatment of the evolution of primordial fields and apply it to weakly helical seeds as they occur in certain early Universe scenarios. We find that initial helicities not much larger than the baryon to photon number can lead to fields of about 10^{-13} Gauss with coherence scales slightly below a kilo-parsec today.

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