More and more astronomers and astrophysicits think that dark matter does not exist. Rather than to search an explanation of the anomalies by an inobservable unobserved matter, it would more judicious to re-examine the physical laws constituting the standard model, and which are also questioned by even more fundamental problems. It would then be possible to solve several problems at The string theory and axions

Some astrophysicists turn for example to the of the string theory. The string theory adds six new dimensions to the four usual ones (three dimensions of space and one dimension for time) and would place the dark matter in these new dimensions which are inaccessible for us; explaining why it would not be detectable. The electromagnetic and nuclear forces (strong and weak) would be confined in our four dimensions and could not leave them. On the other hand, the gravitation could disperse in other dimensions, and then drop in intensity compared to the other forces.