Can Primordial Black Holes explain LIGO data?

Adviser: Ely Kovetz

Student: זאב גירש

Abstract

It was previously suggested that the mass of stellar black holes is constrained by lower and upper mass gaps, being the result of the life cycle of stellar objects like neutron stars and pair-instability supernovae. However, the recent LIGO-Virgo O3 run has revealed several surprising results, namely the measurements of black hole masses well outside the suggested constraints. In this work, we explore the possibility that these outlier events are the outcome of interactions between Primordial Black Holes (PBHs), and show that these theoretical, none-stellar blackholes, could produce observable features that are not limited to the constraints of stellar-mass black holes. We use the Smoluchowski coagulation equation to model the initial black hole mass function, its evolution in time and account for the LIGO observational bias to produce several predictions that can be confirmed with future LIGO runs. This analytical approach enables a controlled study of the various parameters involved in PBH interactions and could shed new light on the evolution of the structure of the universe.
Advertised on Feb. 8, 2021
Abstract added on Feb. 8, 2021
Abstract approved on Feb. 8, 2021 by Kovetz, Ely (kovetz)