> Can dark matter have its own dark-only version of the electromagnetic force? Or is that ruled out by the lack of clumping? My "feeling" is, it's not "intuiti

> Can dark matter have its own dark-only version of the electromagnetic force? Or is that ruled out by the lack of clumping? My "feeling" is, it's not "intuitive enough" to "guess" any answer without a lot of computing: https://www.quantamagazine.org/coder-physicists-are-simulating-the-universe-to-unlock-its-secrets-20180612/ https://www.quantamagazine.org/coder-physicists-are-simulati... We think we're quite sure in our observations, so that helps, but to be able to claim how the simple laws can exactly produce what we see, we have to do a lot of work. Just like what Newton figured out was not provable before without all the computations: http://www4.ncsu.edu/~kimler/hi322/halleytale.html http://www4.ncsu.edu/~kimler/hi322/halleytale.html