Lower bound on the primordial black hole merger rate

Ville Vaskonen, Hardi Veermäe

Research output: Contribution to journalArticlepeer-review

118 Citations (Scopus)


We derive a lower bound on the merger rate of primordial black hole (PBH) binaries by estimating the maximal fraction of binaries that were perturbed between formation in the early Universe and merger, and computing a conservative merger rate of perturbed binaries. This implies robust constraints on the PBH abundance in the range 1-100Mm. We further show that LIGO/Virgo design sensitivity has the potential to reach the PBH mass range of 10-2-103Mm. The constraint from the merger rate of perturbed binaries is stronger if PBHs are initially spatially clustered.

Original languageEnglish
Article number043015
JournalPhysical Review D
Issue number4
Publication statusPublished - 15 Feb 2020


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