3 ms·
Fair point r.e. low cross section. Think the main reason neutrons are ruled out as DM because free neutrons decay, they have a half-life of ~10 minutes. So if
by walrus1066 8y ago
Fair point r.e. low cross section.
Think the main reason neutrons are ruled out as DM because free neutrons decay, they have a
half-life of ~10 minutes. So if DM was neutron, nearly all of it would have decayed into protons, electrons & neutrinos, the former two of which we would definitely be able to see.
- dogma1138 8y agoBaryonic matter doesn’t have to be free neutrons, cold baryonic matter can be stable we have found it already just as we have found brown dwarfs there just isn’t enough of it to make up for the missing mass hence it’s not a likely candidate at this point. PS Protons are also baryons and are stable.