Reply to post: Re: Matter/antimatter vs "regular"/"dark" matter

Physicists believe they may have found fifth force of nature

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Re: Matter/antimatter vs "regular"/"dark" matter

But when a star forms it is gravity that pulls it all together and the other forces that, via solar ignition/fusion, keep it from collapsing completely - so what keeps dark matter diffuse ?

The simple answer is "heat". The particles are speeding around and can't dump their kinetic energy (because they don't interact with anything). So they don't slow down and form large self-gravitating halos.

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