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Primordial black hole clusters, phenomenology & implications

May 10, 2024

14 pages

Published in:

Phys.Dark Univ. 47 (2025) 101789

Published: Dec 22, 2024

e-Print:

2405.06391 [astro-ph.CO]

DOI:

10.1016/j.dark.2024.101789 (publication)

Report number:

IFT-UAM/CSIC-24-61

View in:

ADS Abstract Service

reference search4 citations

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Abstract: (Elsevier B.V.)

We present direct N-body simulations of black-hole-only clusters with up to 2 · 10⁴ compact objects, zero natal spin and no primordial binaries as predicted by various primordial black hole (PBH) Dark Matter models. The clusters’ evolution is com- puted using NBODY6++GPU, including the effects of the tidal field of the galaxy, the kicks of black hole mergers and orbit-averaged energy loss by gravitational radia- tion of binaries. We investigate clusters with four initial mass distributions, three of which attempt to model a generic PBH scenario using a lognormal mass distribu- tion and a fourth one that can be directly linked to a monochromatic PBH scenario when accretion is considered. More specifically, we dive into the clusters’ internal dy- namics, describing their expansion and evaporation, along with the resultant binary black hole mergers. We also compare several simulations with and without black hole merger kicks and find modelling implications for the probability of hierarchical mergers.

Note:

14 pages, 9 figures, 2 tables

Primordial black holes
Binary black holes
Black hole dynamics

References(56)

Figures(16)

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