Speaker
Michele Benaco
(University of Jyväskylä)
Description
Higgs portal models are among the simplest and most widely studied realizations of particle Dark Matter (DM). We revisit scalar, vector, and fermionic Higgs portal models, focusing on the resonant regime and dropping the assumption of kinetic equilibrium. We solve for the full momentum-dependent Boltzmann equations using the DRAKE code and compare the outcomes with the Lee-Weinberg solution which assumes kinetic equilibrium during the freeze-out. We find that the non-equilibrium phase space evolution near the resonance can significantly affect the relic density. We compare our results against present experimental constraints and forecasted sensitivity of future surveys, and determine the updated limits for Higgs-portal DM models.