Hidden Sector Monopole Dark Matter with Matter Domination
Michael L. Graesser, Jacek K. Osi\'nski

TL;DR
This paper explores hidden-sector magnetic monopoles as dark matter candidates, analyzing their production via the Kibble-Zurek mechanism across various cosmological histories, including matter domination, and finds monopoles with masses up to 10^5 PeV could account for dark matter.
Contribution
It revisits topological dark matter with a focus on monopoles, considering diverse cosmological histories and deriving conditions for their relic abundance and mass.
Findings
Monopole masses of 1-10^5 PeV can explain dark matter abundance.
Early matter domination affects monopole relic density and required mass.
Monopole production is consistent with non-thermal cosmological scenarios.
Abstract
The thermal freeze-out mechanism for relic dark matter heavier than TeV requires cross-sections that violate perturbative unitarity. Yet the existence of dark matter heavier than these scales is certainly plausible from a particle physics perspective, pointing to the need for a non-thermal cosmological history for such theories. Topological dark matter is a well-motivated scenario of this kind. Here the hidden-sector dark matter can be produced in abundance through the Kibble-Zurek mechanism describing the non-equilibrium dynamics of defects produced in a second order phase transition. We revisit the original topological dark matter scenario, focusing on hidden-sector magnetic monopoles, and consider more general cosmological histories. We find that a monopole mass of order () PeV is generic for the thermal histories considered here, if monopoles are to entirely…
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