nprofile1qy2hwumn8ghj7un9d3shjtnyd968gmewwp6kyqpq9g86fe4my0hhfks50t2049zlmstlfrwyd6kahh3fhg5xwc8lt3cqfcgu9p (nprofile…gu9p) My intuition is that grav-only DM *particles* are impossible. At some temperature, whatever DM is should equilibrate with other junk. If gravity only, DM would need to be some weird thing like Milgrom & friends.
WIMPs have plenty of space to hide in, and we haven’t even measured neutrino mass yet. I’m not worried enough yet to consider the truly weird.