Mainly motivated by the recent GW190521 mass gap event which we take as a benchmark point, we critically assess if binaries made of a primordial black hole and a black hole of astrophysical origin may form, merge in stellar clusters and reproduce the LIGO/Virgo detection rate. While two previously studied mechanisms - the direct capture and the three body induced - seem to be inefficient, we propose a new "catalysis"channel based on the idea that a subsequent chain of single-binary and binary-binary exchanges may lead to the formation of a high mass binary pairs and show that it may explain the recent GW190521 event if the local overdensity of primordial black holes in the globular cluster is larger than a few.

The astro-primordial black hole merger rates: A reappraisal / Kritos, K.; De Luca, V.; Franciolini, G.; Kehagias, A.; Riotto, A.. - In: JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS. - ISSN 1475-7516. - 2021:5(2021). [10.1088/1475-7516/2021/05/039]

The astro-primordial black hole merger rates: A reappraisal

Franciolini G.;Riotto A.
2021

Abstract

Mainly motivated by the recent GW190521 mass gap event which we take as a benchmark point, we critically assess if binaries made of a primordial black hole and a black hole of astrophysical origin may form, merge in stellar clusters and reproduce the LIGO/Virgo detection rate. While two previously studied mechanisms - the direct capture and the three body induced - seem to be inefficient, we propose a new "catalysis"channel based on the idea that a subsequent chain of single-binary and binary-binary exchanges may lead to the formation of a high mass binary pairs and show that it may explain the recent GW190521 event if the local overdensity of primordial black holes in the globular cluster is larger than a few.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1643208
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