Does dark matter act gravitationaly to itself. If Yes, why does not form more compact objects?

Question

Does dark matter act gravitationaly to itself.If Yes, why does not form more compact objects? Can this be explained as its components have enough kinetic energy to overcome the collapse?

Does this answer your question? If dark matter only interacts with gravity, why doesn't it all clump together in a single point? — Michael Seifert, Sep 15 '21 at 18:03

score 1 · Answer 1 · answered Sep 15 '21 at 18:37

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Yes, dark matter acts on itself via gravity, why wouldn't it. It can't form compact objects because it can't shed angular momentum, as explained here: If dark matter only interacts with gravity, why doesn't it all clump together in a single point?

answered Sep 15 '21 at 18:37

rfl

6,455

Shouldn't it be able to shed angular momentum via gravitational waves? – Ryan_L Sep 15 '21 at 21:46
Yes but that's utterly negligible. The dominant effect comes from three-body interactions ("swing-by") and even that is very inefficient – rfl Sep 16 '21 at 07:35

Does dark matter act gravitationaly to itself. If Yes, why does not form more compact objects?

1 Answers1