The neutral member of a Majorana fermion triplet (Sigma^+,Sigma^0,Sigma^-) is proposed as a candidate for the dark matter of the Universe. It may also serve as the seesaw anchor for obtaining a radiative neutrino mass.
@article{arxiv.0809.0942,
title = {Fermion Triplet Dark Matter and Radiative Neutrino Mass},
author = {Ernest Ma and Daijiro Suematsu},
journal= {arXiv preprint arXiv:0809.0942},
year = {2009}
}