Axion thermalization in the early universe
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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.
Is part ofPhysical Review D, 2002, vol. 66, p. 023004
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