Heavy QCD axion dark matter from avoided level crossing
Jun 7, 20236 pages
Published in:
- Phys.Rev.D 108 (2023) 9, L091703
- Published: Nov 1, 2023
e-Print:
- 2306.04678 [hep-ph]
DOI:
- 10.1103/PhysRevD.108.L091703 (publication)
View in:
Citations per year
Abstract: (APS)
The QCD axion offers a natural resolution to the strong- problem and provides a compelling dark matter candidate. If the QCD axion constitutes all the dark matter, the simplest models pick out a narrow range of masses around . We point out a natural production mechanism for QCD axion dark matter at masses up to existing astrophysical bounds [ for the most minimal models and for nucleophobic models]. If the QCD axion mixes with a sterile axion, the relative temperature dependence of their potentials can lead to an avoided level crossing of their mass eigenstates. This leads to a near-total transfer of energy density from the sterile axion to the QCD axion, resulting in a late-time QCD axion abundance sufficient to make up all of present-day dark matter. Our result provides additional theoretical motivation for several direct detection experiments that will probe this part of parameter space in the near future.Note:
- 6 pages, 2 figures, matches published version
- quantum chromodynamics: axion
- axion: dark matter
- strong interaction: CP
- up: mass
- energy: density
- crossing
- axion: mass
- numerical calculations
- sterile
- resolution
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Figures(2)
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