A Note on the Cosmic Evolution of the Axion in a Strong Magnetic Field
arXiv:astro-ph/0512324 · doi:10.1088/1475-7516/2006/09/017
Abstract
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.
arXiv comment2 pages, no figures. Minor changes. References added. Accepted for publication in JCAP
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