Using a mechanism which allows naturally small Dirac neutrino masses and its linkage to a dark gauge U(1)D symmetry, a realistic Dirac neutrino mass matrix is derived from S3. The dark sector naturally contains a fermion singlet having a small seesaw mass. It is thus a good candidate for freeze-in dark matter from the decay of the U(1)D Higgs boson.
@article{arxiv.2102.05083,
title = {Dirac Neutrino Mass Matrix and its Link to Freeze-in Dark Matter},
author = {Ernest Ma},
journal= {arXiv preprint arXiv:2102.05083},
year = {2021}
}