Nonthermal dark matter production and leptogenesis in a Lμ−Lτ XinXin Qi, Hao Sun

We discuss the possibility of light scalar dark matter generated by right-handed neutrino in a Lμ−Lτ model, in which the dark matter ϕdm carries U(1)Lμ−Lτ charge but it is a singlet in the Standard Model. We discuss the case that dark matter production mainly comes from scattering associated with a pair of right-handed neutrinos non-thermally while other related processes are highly suppressed. A feasible parameter space is considered and we found the correct dark matter relic density can be obtained without influencing the result of leptogenesis result. The heavier right-handed neutrino will induce colder dark matter production and the allowed dark matter mass region is [10−5  GeV,0.1  GeV].