Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Volume -, Issue 1, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1475-7516/2020/01/034
Keywords
cosmology of theories beyond the SM; dark matter theory; particle physics - cosmology connection; physics of the early universe
Funding
- Simons Center for Geometry and Physics (Program: Geometry & Physics of Hitchin Systems)
- National Science Foundation [DMS-1440140]
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It is quite conceivable that dark matter freeze-out occurred during an early period of matter domination, in which case the evolution and relic abundance differ from standard freeze-out calculations which assume a radiation dominated universe. Here we re-examine the classic models in which dark matter interactions with the Standard Model are mediated via either the Higgs or Z boson in the context of matter dominated freeze-out. We highlight that while these classic models are largely excluded by searches in the radiation dominated case, matter dominated freeze-out can relax these limits and thus revive the Higgs and Z portals. Additionally, we discuss the distinctions between matter dominated freeze-out and decoupling during the transition from matter domination to radiation domination, and we comment on the parameter regimes which lead to non-negligible dark matter production during this transition.
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