Constraining Primordial Black Hole Fraction at the Galactic Centre using radio observational data

TL;DR

This study uses archival radio data from the Galactic Centre to place constraints on the fraction of primordial black holes within dark matter, considering various mass distributions, and finds they are a minor component.

Contribution

It introduces a novel method of constraining PBH abundance using radio observations of the Galactic Centre across multiple mass distributions.

Findings

PBHs constitute a minor component of dark matter at the Galactic Centre.

Radio data effectively constrains PBH fractions across different mass models.

Constraints are consistent with previous gamma-ray and cosmic-ray observations.

Abstract

Recent gamma-ray and cosmic-ray observations have put strong constraints on the amount of primordial black holes (PBHs) in our universe. In this article, we use the archival radio data of the inner Galactic Centre to constrain the PBH to dark matter ratio for three different PBH mass distributions including monochromatic, log-normal and power-law. We show that the amount of PBHs only constitutes a very minor component of dark matter at the Galactic Centre for a large parameter space.