Bonn - Small Lecture Hall Mathematics
Dark matter, singlet extensions of the nuMSM, and symmetries
The Lyman-alpha forest bound severely constrains the non-resonant production of warm dark matter in the nuMSM. It has been shown that an extension of the nuMSM by a Higgs singlet phi can provide a dark matter production mechanism through the decays of phi that readily satisfies or escapes the Lyman-alpha bound. I will discuss the astrophysical and cosmological constraints on such models and demonstrate how the required pattern of masses and couplings can be realized with underlying symmetries.