We overview the constraints on the 4th-generation neutrino dark matter candidate and investigate a possible way to make it a viable dark matter candidate. Given the LEP constraints tell us that the 4th-generation neutrino has to be rather heavy (>MZ/2), in sharp contrast to the other three neutrinos, the underlying nature of the 4th-generation neutrino is expected to be different. We suggest that an additional gauge symmetry B-4L4 distinguishes it from the standard model's three lighter neutrinos and this also facilitates promotion of the 4th-generation predominantly right-handed neutrino to a good cold dark matter candidate. It provides distinguishable predictions for the dark matter direct detection and the Large Hadron Collider experiments. © 2011 Elsevier B.V.
Lee, H. S., Liu, Z., & Soni, A. (2011). Neutrino dark matter candidate in fourth generation scenarios. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 704(1–2), 30–35. https://doi.org/10.1016/j.physletb.2011.08.051