期刊
PHYSICAL REVIEW D
卷 98, 期 12, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.98.123532
关键词
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资金
- U.K. Science and Technology Facilities Council [ST/P000762/1, ST/J001546/1]
- Simons Foundation
- Estonian Research Council [MOBJD323]
- STFC [ST/P000762/1] Funding Source: UKRI
The observed dark matter abundance in the Universe can be fully accounted for by a minimally coupled spectator scalar field that was light during inflation and has sufficiently strong self-coupling. In this scenario, dark matter was produced during inflation by amplification of quantum fluctuations of the spectator field. The self-interaction of the field suppresses its fluctuations on large scales and, therefore, avoids isocurvature constraints. The scenario does not require any fine-tuning of parameters. In the simplest case of a single real scalar field, the mass of the dark matter particle is in the range 1 GeV less than or similar to m less than or similar to 10(8) GeV, depending on the scale of inflation, and the lower bound for the quartic self-coupling is lambda greater than or similar to 0.45.
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