In summary, the conversation discussed the importance of effective communication in relationships and how it can lead to misunderstandings if not done properly. The speakers also touched on the different styles of communication and how they can impact relationships. Additionally, they emphasized the importance of actively listening to understand rather than just listening to respond.
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.