Can synchrotron radiation reveal the presence of {\it dark sector} around black hole?

TL;DR

This paper investigates whether synchrotron radiation emitted by charged particles near black holes can reveal the presence of dark sector fields, specifically dark photons, through their influence on radiation power and energy loss.

Contribution

It introduces a model coupling Maxwell and dark photon fields around black holes and analyzes the resulting synchrotron radiation to identify potential dark matter signatures.

Findings

Dark sector fields affect radiation power and energy loss.

Synchrotron radiation patterns can indicate dark photon presence.

Black hole magnetization influenced by dark sector interactions.

Abstract

We studied synchrotron radiation of a massive charged under visible and hidden sector groups, moving in equatorial plane around spherically symmetric weakly magnetized black hole. As a model of dark matter we choose the one, in which Maxwell field is coupled to the additional $U(1)$-gauge field envisaging the dark sector, the so-called dark photon model. Magnetization of a black hole also stems from Maxwell-dark photon electrodynamics. One found the radiation power and energy loss of the particle and looked for the imprints of dark matter on those phenomena.