If superfluidity sets in at mK-level, the CMB-radiation being around 2.7 K, at least the disk of a spiral galaxy, especially the core (or bubble) is significantly warmer than that (not to mention a galaxy cluster, in which the ICM heats up pretty much), it is hard to understand how the mK-level could be attained and maintained. Unless this is explained to the inclined visitor, it is an interesting theory, but lacks physical relevance.
By the way: Wasn’t it mentioned earlier that dark matter is NOT a particle known from the Standard Model ?! Now we are told about dark matter atoms ?!
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