Spins of primordial black holes formed in different cosmological scenarios

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 o...

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Bibliographic Details
Published in:Physical review. D 2021-09, Vol.104 (6), p.1, Article 063008
Main Authors: Flores, Marcos M., Kusenko, Alexander
Format: Article
Language:English
Subjects:
Angular momentum
Astronomical black holes
Astronomy
Black holes
Cooling
Dark matter
Gravitational waves
Perturbation
PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
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Summary: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. 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.
ISSN:2470-0010
2470-0029
DOI:10.1103/PhysRevD.104.063008