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Probing Freeze-in Dark Matter via Heavy Neutrino Portal

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arxiv 2210.07739 v3 pith:O6EXECNJ submitted 2022-10-14 hep-ph astro-ph.CO

Probing Freeze-in Dark Matter via Heavy Neutrino Portal

classification hep-ph astro-ph.CO
keywords freeze-inmasscasesdarkheavymattermodelneutrino
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We explore the possibility of probing freeze-in dark matter (DM) produced via the right-handed neutrino (RHN) portal using the RHN search experiments. We focus on a simplified framework of minimally-extended type-I seesaw model consisting of only four free parameters, namely the RHN mass, the fermionic DM mass, the Yukawa coupling between the DM and the RHN, and a real singlet scalar mass. We consider two cases for the DM production either via decay of the thermal RHN or via scattering of the bath particles mediated by the RHN. In both cases, we show that for sub-TeV scale DM masses, the allowed model parameter space satisfying the observed DM relic density for freeze-in scenario falls within the reach of current and future collider, beam dump and forward physics facilities looking for feebly-coupled heavy neutrinos.

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  1. Electroweak right-handed neutrino portal dark matter

    hep-ph 2025-12 conditional novelty 5.0

    In neutrino-portal dark matter, ignoring internal dark-sector interactions during freeze-in can underestimate the final relic abundance by 30–95%.