Journal
PHYSICAL REVIEW LETTERS
Volume 124, Issue 25, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.124.251802
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Funding
- DOE [DE-AC02-05CH11231, DE-SC0009988, DE-SC0019225]
- NSF [NSF-1638509]
- Raymond and Beverly Sackler Foundation Fund
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In the conventional misalignment mechanism, the axion field has a constant initial field value in the early Universe and later begins to oscillate. We present an alternative scenario where the axion field has a nonzero initial velocity, allowing an axion decay constant much below the conventional prediction from axion dark matter. This axion velocity can be generated from explicit breaking of the axion shift symmetry in the early Universe, which may occur as this symmetry is approximate.
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