typicalspecial
typicalspecial t1_iwz89py 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
I wouldn't discount modified gravity entirely. Of course dark matter can fix it, because dark matter is defined as whatever will fix it.
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.