This paper is very weird. They basically assume we are rotating with respect to the center of a galaxy and that is why the see different rotational velocity com

This paper is very weird. They basically assume we are rotating with respect to the center of a galaxy and that is why the see different rotational velocity compared to when we would not be in a rotating frame. This could be the case for a single galaxy. But how can we be in a rotating frame towards the center of all galaxies? That doesn't make sense to me. So the math would be correct for a single galaxy, but this cannot happen for all galaxies at the same time. What is interesting though, that they basically find a model with a single additional parameter per galaxy (angular velocity omega) that fits most of the rotation curves very well. However the most simple explanation how we get this omega is not by assuming fictitious forces from rotation frames, but simply real forces from dark matter.