Production of Axions by Cosmic Magnetic Helicity
classification
🌌 astro-ph
keywords
axionhelicitycosmicmagneticproductionaboveabundanceaxions
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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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