Axion dark matter: What is it and why now?

Axion dark matter: What is it and why now?
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DOI:
10.1126/sciadv.abj3618
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发表时间:
2022-02-25
期刊:
影响因子:
13.6
通讯作者:
Marsh DJE
Marsh DJE
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Chadha-Day F;Ellis J;Marsh DJE

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The axion has emerged in recent years as a leading particle candidate to provide the mysterious dark matter in the cosmos, as we review here for a general scientific audience. We describe first the historical roots of the axion in the Standard Model of particle physics and the problem of charge-parity invariance of the strong nuclear force. We then discuss how the axion emerges as a dark matter candidate and how it is produced in the early universe. The symmetry properties of the axion dictate the form of its interactions with ordinary matter. Astrophysical considerations restrict the particle mass and interaction strengths to a limited range, which facilitates the planning of experiments to detect the axion. A companion review discusses the exciting prospect that the axion could be detected in the near term in the laboratory. Axions are hypothetical particles that can explain symmetries in nature, and dark matter, experiencing resurgent popularity.
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