Speaker
Description
We present a simple model on neutrino masses and mixings based on $S_4$ modular symmetry. Two right-handed neutrinos and three fermion singlets are introduced to account for the light neutrino masses through inverse seesaw and to provide an intermediate scale sterile neutrino as a dark matter candidate. The model has a viable parameter space given the latest constraints on lepton mixing matrix and squared-mass differences ratios. The viable parameters also lead to a sterile neutrino with mass in $[0.03,45]$ keV and mixing to active neutrinos as $\sin^2 2\theta \in [10^{-8},10^{-14}]$, which is subject to X-ray search and Lyman-$\alpha$ constraints. We find that the sterile neutrino can still serve as a viable dark matter candidate. Besides, the model can be falsified with future neutrino experiments.
