Mergers of primordial black holes in extreme clusters and the $H_0$ tension

Abstract

We consider a cosmological model with dark matter in the form of $\sim 10^{-12}{M}_{\odot }$ primordial black holes in dense weakly relativistic clusters with masses $18-560M_{\odot }$. It is shown that during the multiple collisions of the black holes the $\sim 10$\% of the initial cluster mass can be transformed into gravitational waves in the time interval from recombination to the redshifts $z\ge 10$. At the recombination epoch, the density of matter was larger by $\sim 10$\% and, accordingly, the universe expansion rate was higher. This leads to a shortening of the sound horizon scale, as is necessary to solve the "$H_0$ tension" problem.

8 pages, 3 figures; updated with the accepted version

References in corpus (7)

• Primordial Black Holes as Dark Matter: Recent Developments
• Remnant mass, spin, and recoil from spin aligned black-hole binaries
• Constraints on the induced gravitational wave background from primordial black holes
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• Self-interacting dark matter from late decays and the $H_0$ tension
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• Precision Calculation of Dark Radiation from Spinning Primordial Black Holes and Early Matter Dominated Eras
• Cosmology Intertwined: A Review of the Particle Physics, Astrophysics, and Cosmology Associated with the Cosmological Tensions and Anomalies
• Gravitational waves from the merger of two primordial black hole clusters
• Generalized Entropy Implies Varying-G: Horizon Area Dependent Field Equations and Black Hole-Cosmology Coupling
• Constraining the swiss-cheese IR-fixed point cosmology with cosmic expansion
• Cosmological black holes are not described by the Thakurta metric: LIGO-Virgo bounds on PBHs remain unchanged
• Dynamics and merger rate of primordial black holes in a cluster
• Cosmological Impacts of Black Hole Mergers: No Relief in Sight for the Hubble Tension