Axion thermalization in the early universe
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2002
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Massó, Eduard
Rota, Francesc
Zsembinszki, Gabriel
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Abstract
We reanalyze the conditions under which we have a primordial thermal population of axions. We extend a
previous study and take into account processes involving gluons and quarks. We conclude that if the PecceiQuinn
scale satisfies Fa,1.231012 GeV there is thermal axion production. In this case, a period in the early
universe exists where axions would interact with the QCD plasma and we point out that nonthermal axions
produced before the end of this period would thermalize.
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Physical Review D, 2002, vol. 66, p. 023004