ALP Dark Matter, Cosmological Magnetic Fields and the Direct Collapse Black Hole Formation Scenario

TL;DR

This paper explores how ultralight axion-like particles (ALPs) could generate magnetic fields that influence dark matter fluctuations, producing radiation that facilitates the formation of direct collapse black holes, consistent with observational bounds.

Contribution

It demonstrates a novel mechanism linking ALP-induced magnetic fields to primordial dark matter fluctuations and black hole formation, integrating cosmological magnetic fields with dark matter physics.

Findings

ALP coupling to electromagnetism can produce magnetic fields affecting dark matter.

The generated flux of Lyman-Werner photons supports direct collapse black hole formation.

Flux levels are consistent with ARCADE2 and EDGES radio observations.

Abstract

Assuming that dark matter is an ultralight pseudoscalar particle which couples to electromagnetism like an axion (an ALP), we demonstrate that the coupling of the cosmological magnetic field produced by the ALP field oscillations to the primordial dark matter fluctuations yields a spectrum of gauge field fluctuations which can produce a sufficient flux of Lyman-Werner photons to enable the Direct Collapse Black Hole formation scenario. The induced flux is consistent with the bounds on the excess flux of radio photons from ARCADE2 and EDGES measurements.