3 ms·
Neutrinos aren't dark matter.
by arbitrage 4y ago
Neutrinos aren't dark matter.
- mr_mitm 4y agoThey are, because they have mass and don't interact electromagnetically. They are just not cold dark matter, because their mass is so low they behave more like radiation than matter, i.e. the scale as a^4 instead of a^3, where a is the scale factor. A sterile neutrino, if it existed, could still be a dark matter candidate.