The evaporating primordial black hole fraction in cool-core galaxy clusters

TL;DR

This paper introduces a new method using X-ray data from cool-core galaxy clusters to constrain the fraction of evaporating primordial black holes, finding they are a minor component of dark matter.

Contribution

The study presents an indirect approach to constrain evaporating PBHs using X-ray luminosity data, extending previous cosmic-ray and multi-wavelength constraints.

Findings

Evaporating PBHs constitute a minor component of dark matter.

Constraints are consistent with other cosmic-ray and multi-wavelength observations.

Results cover various PBH mass distributions.

Abstract

Recent studies of gamma-ray, cosmic-ray and radio data put stringent constraints on the fraction of primordial black holes (PBHs) in our universe. In this article, we propose a new indirect method in using the X-ray luminosity data of cool-core clusters to constrain the evaporating PBH fraction for the monochromatic, log-normal and power-law mass distributions. The present results show that the amount of evaporating PBHs only constitutes a minor component of dark matter for a large parameter space. The constraints are consistent with and close to that obtained from other cosmic-ray and multi-wavelength observations.