Predictions for axion couplings from ALP cogenesis

Raymond T. Co, Lawrence J. Hall, Keisuke Harigaya

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59 Scopus citations


Adding an axion-like particle (ALP) to the Standard Model, with a field velocity in the early universe, simultaneously explains the observed baryon and dark matter densities. This requires one or more couplings between the ALP and photons, nucleons, and/or electrons that are predicted as functions of the ALP mass. These predictions arise because the ratio of dark matter to baryon densities is independent of the ALP field velocity, allowing a correlation between the ALP mass, ma, and decay constant, fa. The predicted couplings are orders of magnitude larger than those for the QCD axion and for dark matter from the conventional ALP misalignment mechanism. As a result, this scheme, ALP cogenesis, is within reach of future experimental ALP searches from the lab and stellar objects, and for dark matter.

Original languageEnglish (US)
Article number172
JournalJournal of High Energy Physics
Issue number1
StatePublished - Jan 2021
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2021, The Author(s).


  • Beyond Standard Model
  • Cosmology of Theories beyond the SM


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