Speaker
Description
The singlet-doublet fermion model of dark matter is an economical weak-scale dark matter model, which realizes the dark matter abundance through interactions with the weak bosons of the Standard Model. Depending on the size of the Yukawa couplings in the model, the dark matter relic abundance can be realized via freeze-out (including co-annihilation), co-scattering, freeze-in, or a super WIMP mechanism. We analyze the ways this model can realize the dark matter density with particular emphasis on the regime where the Yukawa couplings in the model are small and chemical equilibrium among particles is not guaranteed. Future work includes generalizing this to the case where particles fall out of kinetic equilibrium and solving the full momentum-dependent Boltzmann equation is required.