Thermal Relic Right-Handed Neutrino Dark Matter

Abstract

It is known that two heavy Majorana right-handed neutrinos are sufficient to generate the baryon asymmetry in the present universe. Thus, it is interesting to identify the third right-handed neutrino $N$ with the dark matter. We impose a new discrete symmetry $Z_2$ on this dark matter neutrino to stabilize it. However, the $U(1{)}_{B-L}$ gauge boson $A^{\prime }$ couples to the right-handed neutrino $N$. If the $B-L$ breaking scale $V_{B-L}$ is sufficiently low, the dark matter neutrino $N$ can be in the thermal bath. We find that the thermal relic $N$ can explain the dark matter abundance for the $B-L$ breaking scale $V_{B-L}\sim O(10)$TeV. After considering all the constraints from the existing experiments, a narrow mass region of the thermal produced right-handed neutrino dark matter $N$ is still surviving.

6 pages, 2 figures

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Cited by in corpus (1)

• WIMP Dark Matter from a Natural Discrete Gauge Symmetry in the Standard Model