期刊
PHYSICAL REVIEW LETTERS
卷 122, 期 10, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.122.101301
关键词
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资金
- Spanish Ministry MEC [FPA2014-55613-P]
- Severo Ochoa excellence program of MINECO [SO-2012- 0234, SEV-2016- 0588]
- Generalitat de Catalunya [2014-SGR-1450]
- U.S. Department of Energy, Office of High Energy Physics [DE-FG02-91ER40628, DE-SC0017987]
We propose a mechanism to generate primordial black holes (PBHs) that is independent of cosmological inflation and occurs slightly below the QCD phase transition. Our setup relies on the collapse of long-lived string-domain wall networks and is naturally realized in QCD axion models with domain wall number N-DW > 1 and Peccei-Quinn symmetry broken after inflation. In our framework, dark matter is mostly composed of axions in the meV mass range along with a small fraction, Omega(PBH) greater than or similar to 10(-6)Omega(CDM) of heavy M similar to 10(4) - 10(7) M-circle dot PBHs. The latter could play a role in alleviating some of the shortcomings of the standard cosmological model on subgalactic scales. The scenario might have distinct signatures in ongoing axion searches as well as gravitational wave observatories.
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