Formation and clustering of primordial black holes in Brans-Dicke theory
arXiv:2007.15347 · doi:10.3390/universe6100158
Abstract
The formation of primordial black holes in the early universe in the Brans-Dicke scalar-tensor theory of gravity is investigated. Corrections to the threshold value of density perturbations are found. Above the threshold, the gravitational collapse occurs after the cosmological horizon crossing. The corrections depend in a certain way on the evolving scalar field. They affect the probability of primordial black holes formation, and can lead to their clustering at large scales if the scalar field is inhomogeneous. The formation of the clusters, in turn, increases the probability of black holes merge and the corresponding rate of gravitational wave bursts. The clusters can provide a significant contribution to the LIGO/Virgo gravitational wave events, if part of the observed events are associated with primordial black holes.
arXiv comment14 pages, 2 figures; Presented at the 17th Russian Gravitational Conference (RUSGRAV-17), Saint Petersburg, Russia; references added, misprints corrected
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