https://doi.org/10.1140/epjc/s10052-019-7095-7
Regular Article - Theoretical Physics
Dark matter from freeze-in via the neutrino portal
Fakultät für Physik, Technische Universität Dortmund, 44221, Dortmund, Germany
* e-mail: mathias.becker@tu-dortmund.de
Received:
7
January
2019
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
