The Cherenkov radiation in the galaxy halo of dark matter

TL;DR

This paper investigates Cherenkov radiation caused by light refraction in galaxy halos of dark matter, calculating its intensity and suggesting its potential as a tool to distinguish dark matter density profiles.

Contribution

It introduces a novel approach to detect dark matter distribution in galaxies through Cherenkov radiation analysis based on specific dark matter profiles.

Findings

Cherenkov radiation temperature in X-rays is about microKelvins.

Detection of this radiation could help identify the preferable dark matter density profile.

The study compares effects for Navarro-Frenk-White and Burkett profiles.

Abstract

The effect of light refraction in a galaxy halo of dark matter, described by profiles of Navarro-Frenk-White and Burkett, was considered. Powers of the Cherenkov radiation for the refractive indexes of gravitational fields with these profiles were calculated. It was shown that correspondent radiation temperature in the X-rays range have the magnitude about some microKelvins. It was also marked that its detection may be the criteria on choosing the preferable dark matter density distribution in a galaxy.