Exploring Evaporating Primordial Black Holes with Gravitational Waves

TL;DR

This paper proposes using gravitational wave signatures from evaporating primordial black holes to investigate their formation mechanisms and properties, offering a new observational approach to understanding dark matter and early universe cosmology.

Contribution

It introduces a novel method to probe primordial black hole formation and characteristics through gravitational wave signals linked to their evaporation.

Findings

Gravitational wave signatures can reveal PBH formation details.

Detection of these signals can distinguish between spinning and non-spinning PBHs.

This approach extends to a wide mass range of PBHs.

Abstract

Primordial black holes (PBHs) from the early Universe have been connected with the nature of dark matter and can significantly affect cosmological history. We show that coincidence dark radiation and density fluctuation gravitational wave signatures associated with evaporation of $\lesssim10^9$ g PBHs can be used to explore and obtain important hints about the formation mechanisms of spinning and non-spinning PBHs spanning orders of magnitude in mass-range, which is challenging to do otherwise.