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Resurrecting low-mass axion dark matter via a dynamical QCD scale

Journal Article · · Journal of High Energy Physics (Online)
 [1];  [2];  [3]
  1. University of Durham (United Kingdom); Univ. of California, Irvine, CA (United States)
  2. Chinese Academy of Sciences (CAS), Beijing (China); University of California, Irvine, CA (United States)
  3. University of California, Irvine, CA (United States)
In the framework where the strong coupling is dynamical, the QCD sector may confine at a much higher temperature than it would in the Standard Model, and the temperature-dependent mass of the QCD axion evolves in a non-trivial way. We find that, depending on the evolution of ΛQCD, the axion field may undergo multiple distinct phases of damping and oscillation leading generically to a suppression of its relic abundance. Such a suppression could therefore open up a wide range of parameter space, resurrecting in particular axion dark-matter models with a large Peccei-Quinn scale fa $$\gg$$ 1012 GeV, i.e., with a lighter mass than the standard QCD axion.
Research Organization:
University of Arizona, Tucson, AZ (United States); University of California, Irvine, CA (United States)
Sponsoring Organization:
Chinese Academy of Sciences; National Natural Science Foundation of China; National Science Foundation (NSF); Science and Technology Facilities Council (STFC); USDOE Office of Science (SC)
Grant/Contract Number:
SC0009913
OSTI ID:
1976604
Journal Information:
Journal of High Energy Physics (Online), Journal Name: Journal of High Energy Physics (Online) Journal Issue: 12 Vol. 2021; ISSN 1029-8479
Publisher:
Springer NatureCopyright Statement
Country of Publication:
United States
Language:
English

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