Primordial black holes and the Sunyaev-Zel'dovich effect

TL;DR

This paper proposes a new method to constrain low-mass primordial black holes as dark matter candidates by analyzing the Sunyaev-Zel'dovich effect caused by electrons from Hawking radiation in galaxy clusters.

Contribution

It introduces a novel approach to limit primordial black hole abundance using the Sunyaev-Zel'dovich effect from Hawking radiation, extending previous methods.

Findings

New limits on low-mass primordial black hole abundance

Demonstrates the viability of SZ effect as a probe for Hawking radiation

Provides a robust framework for future observational constraints

Abstract

Primordial black holes are a popular candidate for dark matter. In the mass regime where their conjectured Hawking evaporation is significant, they have been subject to many constraints via X-rays, gamma-rays, and even radio emission. Previously the Sunyaev-Zel'dovich effect has been considered to place further limits on the M > 10M? primordial black hole abundance via the effects of their accretion of ambient gas. In this work, we will present a novel and robust means of placing abundance limits on low-mass black holes, using the Sunyaev-Zel'dovich effect induced by electrons produced via their Hawking radiation within galaxy clusters.