Journal
PHYSICAL REVIEW LETTERS
Volume 121, Issue 8, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.121.081306
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Funding
- National Youth Thousand Talents Program of China
- NSFC [11722327, 11653002, 11421303]
- CAST Young Elite Scientists Sponsorship [2016QNRC001]
- Fundamental Research Funds for Central Universities
- Netherlands Organization for Scientific Research (NWO)
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We report on a novel phenomenon of the resonance effect of primordial density perturbations arisen from a sound speed parameter with an oscillatory behavior, which can generically lead to the formation of primordial black holes in the early Universe. For a general inflaton field, it can seed primordial density fluctuations, and their propagation is governed by a parameter of sound speed square. Once, if this parameter achieves an oscillatory feature for a while during inflation, a significant nonperturbative resonance effect on the inflaton field fluctuations takes place around a critical length scale, which results in significant peaks in the primordial power spectrum. By virtue of this robust mechanism, primordial black holes with specific mass function can be produced with a sufficient abundance for dark matter in sizable parameter ranges.
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