I just read that maybe the dark matter could have dark forces.
Hence, I wonder: dark atoms, dark galaxies, dark intelligent beings. Basically a parallel, interpenetrating universe. Is this plausible?
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Assuming you take the usual position that dark matter interacts only via the weak and gravitational forces, then it doesn't just interact weakly with baryonic matter but it also interacts weakly with other dark matter. That makes it extremely unlikely that dark matter will form the sort of complex structures that make up you and I. I'm afraid it seems very unlikely that dark matter will form anything more structured than a fuzzy blob.
There have been suggestions for types of dark matter that does interact strongly with itself, but not with baryonic matter. For example mirror matter. However such suggestions are entirely speculative without a shred of experimental evidence to back them up.