Spins of primordial black holes formed in different cosmological scenarios

Journal Article · 03 September 2021 · Physical Review D

DOI: https://doi.org/10.1103/physrevd.104.063008 · OSTI ID:1836498

Flores, Marcos M.  ^[1]; Kusenko, Alexander ^[2]

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1. Univ. of California, Los Angeles, CA (United States); University of California, Los Angeles
2. Univ. of California, Los Angeles, CA (United States); Univ. of Tokyo, Chiba (Japan)

Primordial black holes (PBHs) could account for all or part of dark matter, as well as for some LIGO events. We discuss the spins of primordial black holes produced in different cosmological scenarios, with the emphasis on recently discovered possibilities. PBHs produced as a horizon-size collapse of density perturbations are known to have very small spins. In contrast, PBHs resulting from assembly of matterlike objects (particles, Q-balls, oscillons, etc.) can have large or small spins depending on their formation history and the efficiency of radiative cooling. Here, we show that scalar radiation can remove the angular momentum very efficiently, leading to slowly rotating PBHs in those scenarios for which the radiative cooling is important. Gravitational waves astronomy offers an opportunity to determine the spins of black holes, opening a new window on the early Universe if, indeed, some black holes have primordial origin.

• Research Organization: Univ. of California, Los Angeles, CA (United States)
• Sponsoring Organization: USDOE; USDOE Office of Science (SC) High Energy Physics (HEP)
• Grant/Contract Number: SC0009937
• OSTI ID: 1836498
• Journal Information: Physical Review D, Journal Name: Physical Review D Journal Issue: 6 Vol. 104; ISSN 2470-0010
• Publisher: American Physical Society (APS)Copyright Statement
• Country of Publication: United States
• Language: English