QCD Axion Dark Matter with a Small Decay Constant

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

Research output: Contribution to journalArticlepeer-review

72 Scopus citations


The QCD axion is a good dark matter candidate. The observed dark matter abundance can arise from misalignment or defect mechanisms, which generically require an axion decay constant fa∼O(1011) GeV (or higher). We introduce a new cosmological origin for axion dark matter, parametric resonance from oscillations of the Peccei-Quinn symmetry breaking field, that requires fa∼(108-1011) GeV. The axions may be warm enough to give deviations from cold dark matter in large scale structure.

Original languageEnglish (US)
Article number211602
JournalPhysical review letters
Issue number21
StatePublished - May 23 2018
Externally publishedYes

Bibliographical note

Funding Information:
This work was supported in part by the Director, Office of Science, Office of High Energy and Nuclear Physics, of the U.S. Department of Energy under Contract No.DE-AC02-05CH11231 and by the National Science Foundation under Grants No.PHY-1316783 and No.PHY-1521446.

Publisher Copyright:
© 2018 authors. Published by the American Physical Society.


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