Regular Article - Theoretical Physics
Dark matter from freeze-in via the neutrino portal
Fakultät für Physik, Technische Universität Dortmund, 44221, Dortmund, Germany
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Accepted: 1 July 2019
Published online: 19 July 2019
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 case completely, while the resonant freeze-in production is only viable for .
© The Author(s), 2019