I expressed a lack of enthusiasm earlier this week for the latest scheme to rid us of dark matter. It pulls the universe's age too early. Any real determination must, I think, first constrain the age of our own galaxy.
To that end, we'd pick apart where our galaxy has ingested other galaxies - like the Kraken, 11 Gya. We now may have the merger which shared it all, a billion or two years before that: Shakti and Shiva.
As an aside, if dark matter does exist, here are yet more constraints. On the other hand... they may have constrained that it does exist (which, for one, Milgrom et al. failed to prove for Modified Newton).
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