Tracing Primordial Black Holes in Nonsingular Bouncing Cosmology

TL;DR

This paper explores how primordial black holes form and evolve in nonsingular bouncing cosmologies, providing constraints on such models based on PBH backreaction effects.

Contribution

It offers a detailed analysis of PBH formation, evolution, and constraints within nonsingular bouncing cosmological models, a novel approach in early universe studies.

Findings

PBH abundance depends on sound speed and Hubble parameter

Nonsingular bounce models can be constrained by PBH backreaction

Derived PBH density and Hawking radiation during bounce

Abstract

We in this paper investigate the formation and evolution of primordial black holes (PBHs) in nonsingular bouncing cosmologies. We discuss the formation of PBH in the contracting phase and calculate the PBH abundance as a function of the sound speed and Hubble parameter. Afterwards, by taking into account the subsequent PBH evolution during the bouncing phase, we derive the density of PBHs and their Hawking radiation. Our analysis shows that nonsingular bounce models can be constrained from the backreaction of PBHs.