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The number of free variables has gone down dramatically due to extensive theoretical and experimental work. And as already mentioned, there are many very differ
by russdill 4y ago
The number of free variables has gone down dramatically due to extensive theoretical and experimental work. And as already mentioned, there are many very different lines of evidence and it's not like different variables are being to fit each one in isolation.
- throwawaymaths 4y agoIt's still way more than 3 > different variables are being to fit each one in isolation. For the big picture, phenomena that get "explained" by dark matter are absolutely being fit by different individual variables. For example, the ratio of dark matter to baryonic matter is different between clusters and individual galaxies by an order of magnitude. I recall the DMD for CMB is also different but I can't substantiate that memory quickly In the small, too, there are many galaxies where we have no idea what dynamical situation led them to have the dark matter content they exhibit.
- naasking 4y ago> The number of free variables has gone down dramatically due to extensive theoretical and experimental work. The number of free variables in MOND is one, visible mass, and it's surprising the number of observations it matches despite that. There is almost certainly something there. The superfluid dark matter idea that incorporated both was a promising unifying idea, but last I checked the proposed models didn't match some observations.