期刊
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
卷 -, 期 11, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/1475-7516/2021/11/041
关键词
axions; Cosmic strings; domain walls; monopoles; dark matter theory; particle physics-cosmology connection
资金
- U.S. Department of Energy [DE-FG0204ER41286, DE-SC0007914]
- DoE Early Career Grant [DE-SC0017840]
- NSF CAREER grant [PHY-1915852]
- U.S. Department of Energy (DOE) [DE-SC0017840] Funding Source: U.S. Department of Energy (DOE)
Axions have been considered as a plausible candidate for dark matter, but cosmic strings may also lead to appreciable axion production in certain cases. There is skepticism about the possible role of axion strings, with arguments that parameterically strings are already considered in the assumption of random misalignment angles.
Axions have for some time been considered a plausible candidate for dark matter. They can be produced through misalignment, but it has been argued that when inflation occurs before a Peccei-Quinn transition, appreciable production can result from cosmic strings. This has been the subject of extensive simulations. But there are reasons to be skeptical about the possible role of axion strings. We review and elaborate on these questions, and argue that parametrically strings are already accounted for by the assumption of random misalignment angles. We review and elaborate on these questions, and provide several qualitative arguments that parametrically strings are already accounted for by the assumption of random misalignment angles. The arguments are base on considerations of the collective modes of the string solutions, on computations of axion radiation in particular models, and reviews of simulations.
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