The evidence for dark matter is purely observational. From the background radiation signature to galactic collisions and rotation curves. We haven't got a single solid theory on what it is yet, but it's definitely there and was crucial in matter formation in the early universe.
I completely agree with every word, it was the observations alone of dark energy and matter that led me in this direction.
At one time I tried to describe them with an unknown fifth dimension, but later realized that's only an abstraction. Perhaps just maybe black holes and universes share this property of evaporation, which if so, would have interesting consequences.
I have the thought experiment to go along with the paper, if you'd like to see that at https://madhakker.com/ just scroll down one post. That was from when I was trying the fifth dimension angle, but it does a good job of describing a dark matter like signal in the terms of a changing mass.
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