>>12095655Clumping requires two things: Gravity and friction.
Gravity inherently produces a sort of friction in the production of gravitational waves, however it's such an insignificant effect that even on a cosmic timescale it's only relevant to extremely dense objects (which of course require clumping to produce).
So, to have clumped up by now dark matter would have to have friction. Friction simply requires being able to shed energy through self-interaction. It'd have to be significant self-interaction in order to have produced discreet bodies by now. Not necessarily as strong as the interaction of ordinary matter, but not ten orders of magnitude lower either.
So, the answer to your question is dependent on the answer to that question, whether dark matter self-interacts in any significant way.
