Gravitational production of neutrinos with time-dependent mixing during inflation is enhanced but remains bounded by an abundance Y ≲ 10^{-11}.
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Warm Higgs portal dark matter from stronger-coupling freeze-in is viable above 50-100 keV with a non-thermal momentum distribution not captured by the standard alpha-beta-gamma parametrization.
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Neutrino mixing and gravitational production via inflation
Gravitational production of neutrinos with time-dependent mixing during inflation is enhanced but remains bounded by an abundance Y ≲ 10^{-11}.
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Warm dark matter from freeze-in at stronger coupling
Warm Higgs portal dark matter from stronger-coupling freeze-in is viable above 50-100 keV with a non-thermal momentum distribution not captured by the standard alpha-beta-gamma parametrization.