Right-handed neutrinos are a prime candidate for dark matter. The possibilities and exact contributions depend on whether neutrinos are massive or not. The art

Right-handed neutrinos are a prime candidate for dark matter. The possibilities and exact contributions depend on whether neutrinos are massive or not. The article glosses over the fact that massive neutrinos are not part of the mainstream Standard Model, but depend on semi-detached and unconfirmed extensions, such as Majorana spinors and (P)MNS mixing matrix: https://en.wikipedia.org/wiki/Pontecorvo%E2%80%93Maki%E2%80%93Nakagawa%E2%80%93Sakata_matrix https://en.wikipedia.org/wiki/Pontecorvo%E2%80%93Maki%E2%80%...