What if dark matter is unrelated to WIMPs?

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The millenium simulations are the most prominent example, see the external links there for more details.

Regular matter without dark matter is in conflict with all the independent observations of dark matter, the last point there is about the formation of structures in the universe.

The simulations don't agree perfectly, but there is a huge difference between "some details are not so accurate" and "we don't get any structure formation".
 
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