I found this very interesting 5 dimensional theory that treats mass density as a 5th dimension and was created by a nuclear physicist that worked at Los Alamos National Labs. He was allowed to work on his theory for half his time he was there and published numerous technical papers concerning it. He even has a technical paper on designing experiments to test the theory in which he is an advisor created at the Air Force Space Technology Center. One of the most interesting predictions of his theory is a form of fusion that the standard model says is impossible that would make fusion energy far easier to attain. In a nutshell he predicts properly aligning the spin of hydrogen can lower the amount of energy necessary for a form of usually very rare fusion into helium to take place. Not only does this lower the energy requirements, but it it's aneutronic which means it doesn't produce radiation. I wouldn't have believed the claims myself if it wasn't for the fact he was a nuclear physicist with high security clearance and employment at LANL (he is currently deceased.)