Gravitational waves and dark photon dark matter from axion rotations

Raymond T. Co, Keisuke Harigaya, Aaron Pierce

Research output: Contribution to journalArticlepeer-review

39 Scopus citations


An axion rotating in field space can produce dark photons in the early universe via tachyonic instability. This explosive particle production creates a background of stochastic gravitational waves that may be visible at pulsar timing arrays or other gravitational wave detectors. This scenario provides a novel history for dark photon dark matter. The dark photons may be warm at a level detectable in future 21-cm line surveys. For a consistent cosmology, the radial direction of the complex field containing the axion must be thermalized. We explore a concrete thermalization mechanism in detail and also demonstrate how this setup can be responsible for the generation of the observed baryon asymmetry.

Original languageEnglish (US)
Article number99
JournalJournal of High Energy Physics
Issue number12
StatePublished - Dec 2021

Bibliographical note

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


  • Beyond Standard Model
  • Cosmology of Theories beyond the SM
  • Supersymmetric Standard Model


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