期刊
PHYSICAL REVIEW D
卷 97, 期 2, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.97.023501
关键词
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资金
- European Union's Horizon 2020 research and innovation programme under Marie Sklodowska-Curie Grant [656794]
- Spanish Research Agency (Agencia Estatal de Investigacion) through grant IFT Centro de Excelencia Severo Ochoa [SEV-2016-0597]
- project Consolider MultiDark [CSD2009-00064]
- [FPA2015-65929-P]
- Marie Curie Actions (MSCA) [656794] Funding Source: Marie Curie Actions (MSCA)
We propose a model of inflation capable of generating a population of light black holes (about 10-(16)-10(-14) solar masses) that might account for a significant fraction of the dark matter in the Universe. The effective potential of the model features an approximate inflection point arising from two-loop order logarithmic corrections in well-motivated and perturbative particle physics examples. This feature decelerates the inflaton before the end of inflation, enhancing the primordial spectrum of scalar fluctuations and triggering efficient black hole production with a peaked mass distribution. At larger field values, inflation occurs thanks to a generic small coupling between the inflaton and the curvature of spacetime. We compute accurately the peak mass and abundance of the primordial black holes using the Press-Schechter and Mukhanov-Sasaki formalisms, showing that the slow-roll approximation fails to reproduce the correct results by orders of magnitude. We study as well a qualitatively similar implementation of the idea, where the approximate inflection point is due to competing terms in a generic polynomial potential. In both models, requiring a significant part of the dark matter abundance to be in the form of black holes implies a small blue scalar tilt with a sizable negative running and a tensor spectrum that may be detected by the next-generation probes of the cosmic microwave background. We also comment on previous works on the topic.
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