Collisionless dark matter

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When dark matter is called collisionless, does it only mean that they do not collide and scatter, or does it also mean that there is no other significant non-contact interaction?
 
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That would be the LCDM theory of dark matter.
I would think collisionless means no physical scattering, no interaction whatsoever, except through gravity.
But let us have a second opinion before you send off.
Keep you finger on the keyboard.

There is also the SIDM - self interacting dark matter.
 
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