Production of Axions by Cosmic Magnetic Helicity

Details Production of Axions by Cosmic Magnetic Helicity Production of Axions by Cosmic Magnetic Helicity

2005-12-17

arxiv.org/abs/astro-ph/0512458v2

Phys.Rev.Lett.96:161302,2006

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures, major changes in the first part of the paper, reference added, to be published in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.96.161302

We investigate the effects of an external magnetic helicity production on the
evolution of the cosmic axion field. It is shown that a helicity larger than
(few \times 10^{-15} G)^2 Mpc, if produced at temperatures above a few GeV, is
in contradiction with the existence of the axion, since it would produce too
much of an axion relic abundance.

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