Majorana Neutrinos as the Dark Matters in the Cold Plus Hot Dark Matter Model

Abstract

A simple model of the Majorana neutrino with the see-saw mechanism is studied, assuming that two light neutrinos are the hot dark matter each with a mass of 2.4 eV in the cold plus hot dark matter model of cosmology. We find that the heavy neutrino, which is the see-saw partner with the remaining one light neutrino, can be the cold dark matter, if the light neutrino is exactly massless. This cold dark matter neutrino is allowed to have a mass in the wide range from 5.9 × 10^2 eV to 2.2 × 10^7 eV.

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Citation
Kitazawa, N., Okada, N, Sasaki, S. (1996):Majorana Neutrinos as the Dark Matters in the Cold Plus Hot Dark Matter Model. Physics Letters B, 380(3-4). DOI: https://doi.org/10.1016/0370-2693(96)00530-8