A Note on the Cosmic Evolution of the Axion in a Strong Magnetic Field

Details A Note on the Cosmic Evolution of the Axion in a Strong Magnetic Field A Note on the Cosmic Evolution of the Axion in a Strong Magnetic Field

2005-12-13

arxiv.org/abs/astro-ph/0512324v2

JCAP 0609:017,2006

Astronomy and Astrophysics

Astrophysics

2 pages, no figures. Minor changes. References added. Accepted for publication in JCAP

Scientific paper

10.1088/1475-7516/2006/09/017

It has been pointed out in the literature that in the presence of an external magnetic field the axion mass receives an electromagnetic contribution. We show that if a magnetic field with energy density larger than ~10^{-8} times the energy density of the Universe existed at temperatures of a few GeV, that contribution would be dominant and consequently the cosmic evolution of the axion field would change substantially. In particular, the expected axion relic abundance would be lowered, allowing a small relaxation of the present cosmological bound on the Peccei-Quinn constant.

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