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arXiv · 2306.13061

Freeze-in at stronger coupling

Catarina Cosme·Francesco Costa·Oleg Lebedev
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Abstract

Predictivity of many non-thermal dark matter (DM) models is marred by the gravitational production background. This problem is ameliorated in models with lower reheating temperature $T_R$, which allows for dilution of gravitationally produced relics. We study the freeze-in dark matter production mechanism in the thermal bath with the electroweak scale temperature. The process is Boltzmann-suppressed if the dark matter mass is above $T_R$. In this case, the coupling to the thermal bath has to be significant to account for the observed dark matter relic density. As a result, the direct DM detection experiments already probe such freeze-in models, excluding significant parts of parameter space. The forthcoming experiments will explore this framework further, extending to lower couplings and higher reheating temperatures.

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Catarina Cosme, Francesco Costa, Oleg Lebedev. 2023-06-22. Freeze-in at stronger coupling. https://arxiv.org/abs/2306.13061

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