Clustering of Primordial Black Holes. II. Evolution of Bound Systems

Details Clustering of Primordial Black Holes. II. Evolution of Bound Systems Clustering of Primordial Black Holes. II. Evolution of Bound Systems

2011-10-19

arxiv.org/abs/1110.4402v1

Phys. Rev. D 84, 124031 (2011)

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

23 pages, 1 figure. Submitted to PRD

Scientific paper

Primordial Black Holes (PBHs) that form from the collapse of density perturbations are more clustered than the underlying density field. In a previous paper, we showed the constraints that this has on the prospects of PBH dark matter. In this paper we examine another consequence of this clustering: the formation of bound systems of PBHs in the early universe. These would hypothetically be the earliest gravitationally collapsed structures, forming when the universe is still radiation dominated. Depending upon the size and occupation of the clusters, PBH merging occurs before they would have otherwise evaporated due to Hawking evaporation.

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