Axiogenesis with a heavy QCD axion

Raymond T. Co, Tony Gherghetta, Keisuke Harigaya

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


We demonstrate that the observed cosmological excess of matter over anti-matter may originate from a heavy QCD axion that solves the strong CP problem but has a mass much larger than that given by the Standard Model QCD strong dynamics. We investigate a rotation of the heavy QCD axion in field space, which is transferred into a baryon asymmetry through weak and strong sphaleron processes. This provides a strong cosmological motivation for heavy QCD axions, which are of high experimental interest. The viable parameter space has an axion mass ma between 1 MeV and 10 GeV and a decay constant fa< 105 GeV, which can be probed by accelerator-based direct axion searches and observations of the cosmic microwave background.

Original languageEnglish (US)
Article number121
JournalJournal of High Energy Physics
Issue number10
StatePublished - Oct 2022

Bibliographical note

Publisher Copyright:
© 2022, The Author(s).


  • Axions and ALPs
  • Baryo-and Leptogenesis
  • Cosmology of Theories BSM
  • Early Universe Particle Physics


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