Dark matter is a part of the standard model. The fact that scientists have found no evidence of it is one of the nagging mysteries.
We haven't found dark matter particles. The modified gravity model is one of the alternatives that some astronomer prefer. A new study supports them.
MoND was inspired by the rotation of the stars. Most of the visible matter in a galaxy is in the middle, so stars closer to the center have faster orbital speeds than stars farther away. All of the stars in the universe are rotating at the same rate. The rotation curve is not collapsing. The dark matter solution is that the universe is made of dark matter.
The attraction between stars is similar to the structure of the universe. Milgrom proposed to modify the universal law of gravity. He said that gravity has a small remnant pull regardless of distance. The remnant is about 10 trillionths of a G.
You have to modify Einstein's equations as well if you just add a small term toNewton's gravity. MoND has been generalized in a number of ways. There are some differences between AQUAL and the standard model.
A recent study came in here. The rotation speed of inner and outer stars are different. Both should be governed by the distribution of matter. AQUAL predicts a small deviation in the curve. There should be a small shift between the inner and outer velocity distributions, but it is too small to measure.
The author of the paper looked at the high-resolution velocity curves of 152 galaxies that were found in theSPARC database. He was able to agree with AQUAL. It seems that the data supports modified gravity.
The result is exciting but not conclusive. There are issues with the AQUAL model. It is a victory for the theory, which has some people cheering.
The research is available on the arXiv preprint server
There is more information about Kyu-Hyun Chae, Distinguishing Dark Matter, Modified Gravity, and Modified Inertia. There is a book titled "arxiv. 2207.11069."
Journal information: arXiv
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