The fact that the dark matter halos surrounding colliding galactic clusters simply pass through each other without interacting has a simple explanation. If they are superfluid bodies, wouldn't be reasonable to simply assume that their relative speed is less than the super-fluid critical velocity. Then, there wouldn't be a significant momentum transfer between bodies until their collision speed exceeds that velocity.
This might also explain DM free galaxies, if upon colliding, the collision speed is greater than critical, heating effects might change a cold dark matter halo into hot dark matter that cannot be gravitationally bound.
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