Dark Matter from Freeze-In via the Neutrino Portal
Mathias Becker

TL;DR
This paper explores a minimal neutrino portal dark matter model where dark matter is produced via freeze-in, focusing on parameter space regions with small neutrino Yukawa couplings and analyzing the viability of different production mechanisms.
Contribution
It investigates freeze-in production of dark matter in a neutrino portal model, including resonant and non-resonant scenarios, and assesses observational constraints such as the Lyman-alpha forest.
Findings
Non-resonant production yields DM energy density independent of mass.
Resonant production can occur via freeze-in or freeze-out with small couplings.
Lyman-alpha forest constraints exclude feeble freeze-out, favoring resonant freeze-in for DM mass > 3 keV.
Abstract
We investigate a minimal neutrino portal dark matter (DM) model where a right-handed neutrino both generates the observed neutrino masses and mediates between the SM and the dark sector, which consists of a fermion and a boson. In contrast to earlier work, we explore regions of the parameter space where DM is produced via freeze-in instead of freeze-out motivated by the small neutrino Yukawa couplings in case of heavy neutrinos. \\ For a non-resonant production of DM, its energy density is independent of the DM mass. Assuming a democratic coupling structure we find . For the resonant production of DM, we find that it can be produced via freeze-in or freeze-out even with couplings of . However, the measurement of the Lyman- forest rules out the feeble coupled freeze-out…
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