What is the difference between collisionless and self-interacting dark matter?

Ranku · Jan 20, 2023

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?

256bits · Jan 20, 2023

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.

What is the difference between collisionless and self-interacting dark matter?

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What is the difference between collisionless and self-interacting dark matter?

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