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by Sharlin
1068 days ago
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Yes, no friction for the DM particles. WIMP DM cannot collapse by shedding kinetic energy as heat like visible matter can. Thus the dark matter halos around galaxies. But gravity would still cause there to be a higher average density of DM inside and near the dark star (or indeed a modern-day galaxy) than far away from any massive objects. |
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Chandrasekhar dynamical friction?
https://en.wikipedia.org/wiki/Dynamical_friction