Axion thermalization in the early universe

Eduard Massó, Francesc Rota, Gabriel Zsembinszki

Research output: Contribution to journalArticleResearchpeer-review

79 Citations (Scopus)


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 Peccei-Quinn scale satisfies Fa<1.2×1012 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.
Original languageEnglish
Article number023004
Pages (from-to)230041-230045
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Issue number2
Publication statusPublished - 15 Jul 2002


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