Consider a large cloud of dark matter moving under its own gravity. I understand that dark matter doesn't normally lose its kinetic energy, because dark matter doesn't radiate heat away. However, if a large chunk of dark matter moves to a small enough volume, it could bend spacetime enough to form a photon sphere, make orbits unstable, and collapse under its own gravity. Is this a possible scenario? If so, and a dark black hole is formed, would it be distinguishable in any way from a regular black hole? Or would the information about dark matter be lost?
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Related, but not duplicate: https://physics.stackexchange.com/q/90908/ – Oct 12 '17 at 19:56
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sorry, it was an afterthought, I erased it – Oct 13 '17 at 03:59