TY - JOUR

T1 - Redshift evolution of primordial black hole merger rate

AU - Stasenko, Viktor

N1 - I am grateful to Konstantin Belotsky for useful discussions and critical remarks. I also thank the anonymous referee for the very constructive comments, which helped to improve the paper. The work was supported by RSF Grant No. 23-42-00066.

PY - 2024/6/15

Y1 - 2024/6/15

N2 - The gravitational wave signals detected by the LIGO-Virgo-KAGRA collaboration can be explained by mergers of binary primordial black holes (PBHs) formed in the radiation dominated epoch. However, in early structures induced by the Poisson distribution of PBHs, a significant fraction of binaries are perturbed and avoid mergers. In addition, the internal dynamics of early halos lead to the formation of dense primordial black hole clusters within a few Hubble times from the moment of halo formation. In such clusters PBH binaries are effectively formed and their mergers potentially dominate in the modern era. We obtained that the PBH merger rate changes with redshift as R∝(1+z)β, where β=1.4-2.2 reflects the influence of PBH clustering and depends on both z and fPBH. The observed merger rate constraints the fraction of PBHs of tens solar masses in the composition of dark matter fPBH0.001-0.1 in dependence of the clustering efficiency.

AB - The gravitational wave signals detected by the LIGO-Virgo-KAGRA collaboration can be explained by mergers of binary primordial black holes (PBHs) formed in the radiation dominated epoch. However, in early structures induced by the Poisson distribution of PBHs, a significant fraction of binaries are perturbed and avoid mergers. In addition, the internal dynamics of early halos lead to the formation of dense primordial black hole clusters within a few Hubble times from the moment of halo formation. In such clusters PBH binaries are effectively formed and their mergers potentially dominate in the modern era. We obtained that the PBH merger rate changes with redshift as R∝(1+z)β, where β=1.4-2.2 reflects the influence of PBH clustering and depends on both z and fPBH. The observed merger rate constraints the fraction of PBHs of tens solar masses in the composition of dark matter fPBH0.001-0.1 in dependence of the clustering efficiency.

UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-85197612160&origin=inward&txGid=e7193ae4612e944f5612ae2b2861beeb

UR - https://www.mendeley.com/catalogue/be6c3d9e-29f2-358c-ab06-6b877ddb9d6f/

U2 - 10.1103/PhysRevD.109.123546

DO - 10.1103/PhysRevD.109.123546

M3 - Article

VL - 109

JO - Physical Review D

JF - Physical Review D

SN - 2470-0010

IS - 12

M1 - 123546

ER -