3 ms·
Not to forget that neutrinos also do not have an electric charge, i.e. also do not couple to photons directly.
by davrosthedalek 4y ago
Not to forget that neutrinos also do not have an electric charge, i.e. also do not couple to photons directly.
- cratermoon 4y agoThere's probably more, I'm not up on all the particles. My thought is that a) a particle that only interacts with gravity is not prohibited by the Standard Model and b) our inability to detect (yet) such a particle is not proof it doesn't exist.