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Dark Electromagnetism in the Early Universe
The data tell you that the dark matter is pretty smoothly distributed compared to ordinary matter. If there is any interesting chemistry, electromagnetism level physics in the dark matter sector, it's much more feeble than it is in the ordinary matter sector. The final thing we know is that adiabatic fact we mentioned before. When you have the density perturbations in the early universe, the densities in the darkmatter track those in the ordinary Matter.