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Title: Primordial Black Holes from the QCD Axion

Journal Article · · Physical Review Letters

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 NDW > 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, ΩPBH ≳ 10–6ΩCDM of heavy M ~ 104 – 107 M 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.

Research Organization:
Washington Univ., St. Louis, MO (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP); Spanish Ministry MEC; Severo Ochoa excellence program of MINECO; Generalitat de Catalunya
Grant/Contract Number:
FG02-91ER40628; SC0017987; FPA2014-55613-P; SO-2012- 0234; SEV-2016- 0588; 2014- SGR-1450
OSTI ID:
1499214
Alternate ID(s):
OSTI ID: 1610167
Journal Information:
Physical Review Letters, Journal Name: Physical Review Letters Vol. 122 Journal Issue: 10; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 33 works
Citation information provided by
Web of Science

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