A Model for Neutrino Masses and Dark Matter
  We propose a model for neutrino masses that simultaneously results in a new dark matter candidate, the right-handed neutrino. We derive the dark matter abundance in this model, show how the hierarchy of neutrino masses is obtained, and verify that the model is compatible with existing experimental results. The model provides an economical method of unifying two seemingly separate puzzles in contemporary particle physics and cosmology. 
Lawrence M. Krauss (1), Salah Nasri (2) and Mark Trodden (2) ((1)   Departments of Physics and Astronomy, Case Western Reser...