Neutrino Portal to Freeze-in Dark Matter
Abstract
We investigate the possibility of probing freeze-in dark matter (DM) produced via the heavy neutral lepton
(HNL) portal at the HNL frontier within the framework of the type-I seesaw. We consider two cases for
the DM production either via decay of the thermal HNL or via scattering of the bath particles mediated
by the HNL. In both cases, we show that the allowed model parameter space satisfying the observed DM
relic density for the freeze-in scenario remains within reach of several HNL search experiments.
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