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Fermi-Dirac corrections to relic abundances
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We derive an equation for the evolution of the number density of a massive particle species in the early Universe, which correctly accounts for the Fermi-Dirac (FD) statistics. The FD-corrections are sizable and potentially important if the decoupling from the thermal equilibrium takes place at temperatures of the order of, or less than the mass of the particle. This is the case e.g.\ for a few MeV tau neutrino with the ordinary weak interactions.
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Cited by 1 Pith paper
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When direct detection constrains reheating temperature: freeze-in with stronger couplings and inflaton-seeded freeze-in
Stronger couplings or inflaton-seeded initial abundance allow freeze-in dark matter to match the relic density while evading DAMIC-M and PandaX bounds for reheating temperatures below the electroweak scale.
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