2:59:27pm
That's not convincing. There isn't just "one" feature of dark matter, though I understand you are arguing thatindivual elements of dark matter have different fundamental properties from what you might construe as fundamental behaviors or properties of dark matter in aggregate. Quite a few features have been ascribed to dark matter both on the individual level and aggregate. Thus far, it has only been detected (as such) on the aggregate level, so the rest at this point is really not much more than educated speculation. Yes, there is obviously a leading theory accepted by a large majority of cosmologists on what dark matter is, but the reality is that it is far from well understood.
That is the defining feature of dark matter, because as you correctly point out, we have yet to detect dark matter on the particle level. We know from cosmological observations that it interacts with gravitation but not electromagnetism, but particle properties beyond that are speculation as you note.
The fact that galaxies appear to form without dark matter is very interesting, not just to the science of galaxy formation, but to our understanding of dark matter itself. Seems weird you would deny that, but whatever.
I don't deny that it is interesting. It is very interesting, but for the exact opposite reason that you argue. It is evidence that the anomalous rotation speeds of most galaxies, typically attributed to dark matter, are not the result of systematic measurement bias or the need for a modified theory of gravity. That makes dark matter an even more likely explaination.
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