typicalspecial t1_ix0lyt7 wrote
Reply to comment by N8CCRG in Dark Matter as an Intergalactic Heat Source. Spectra from quasars suggest that intergalactic gas may have been heated by a form of dark matter called dark photons. by MistWeaver80
It behaves like matter in that it influences gravity, and that's about it. Proposed particles get ruled out just as modifications do. Ruling out a modification doesn't invalidate all possible models; ruling out proposed dark matter particles doesn't invalidate dark matter being a particle. We can't definitively say it's matter until we can verify its interaction with anything.
N8CCRG t1_ix0oxql wrote
That's what defines matter: it interacts via gravity. Other interactions are different for every other type of particle we know about. Some particles interact through some mechanisms and others don't, but they all interact through gravity.
Meanwhile, modifcations have been blanket ruled out, not individually. Dark matter has been measured in so many different ways, we have been able to say that no modified theory of gravity could explain all of those measurements.
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