>Hot dark matter would be a black body emitter - we would see it. Hot dark matter would be stuff like neutrinos and axions which don't interact electromagnetic

>Hot dark matter would be a black body emitter - we would see it. Hot dark matter would be stuff like neutrinos and axions which don't interact electromagnetically. https://en.wikipedia.org/wiki/Dark_matter#Warm_dark_matter https://en.wikipedia.org/wiki/Dark_matter#Warm_dark_matter