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?

  • $\begingroup$ Related, but not duplicate: physics.stackexchange.com/q/90908 $\endgroup$ – user171879 Oct 12 '17 at 19:56
  • $\begingroup$ sorry, it was an afterthought, I erased it $\endgroup$ – user167013 Oct 13 '17 at 3:59

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Browse other questions tagged or ask your own question.