Resurrecting low-mass axion dark matter via a dynamical QCD scale
Journal Article
·
· Journal of High Energy Physics (Online)
- University of Durham (United Kingdom); Univ. of California, Irvine, CA (United States)
- Chinese Academy of Sciences (CAS), Beijing (China); University of California, Irvine, CA (United States)
- 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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