Self-Interaction and Galactic Magnetic Field Bounds on Millicharged Magnetic Monopole Dark Matter

TL;DR

This paper explores a dark matter model with magnetic monopoles that interact via a dark U(1) symmetry, analyzing how galactic magnetic fields and self-interactions constrain the model's parameters.

Contribution

It introduces a comprehensive analysis of dark monopole dark matter, considering different temperature and symmetry-breaking scales, and derives new bounds from galactic magnetic field constraints.

Findings

Constraints on dark matter self-interactions limit model parameters.

Galactic magnetic field survival constrains dark-visible sector mixing.

Three distinct phenomenological cases are analyzed based on dark sector temperature.

Abstract

A dark matter sector composed of magnetic monopoles of a dark U(1) symmetry having a small kinetic mixing with the Standard Model photon has a rich and interesting phenomenology. The model in itself is also of theoretical interest. Based on the temperature of the dark sector and scale of spontaneous symmetry breaking for this U(1), three phenomenologically distinct cases for this model of dark matter are discussed. In all cases, constraints on dark matter self-interactions are translated into constraints on the model parameters. As the magnetic monopoles acquire a small visible magnetic charge, the survival of galactic magnetic fields, known as the Parker effect, places further constraints on the mixing between the dark and visible sectors.