Taking electromagnetism to be the curvature of the fourth dimension of space, as gravity is of the third dimension in general relativity, one of its namesakes theorized that this dimension is undetectable due to being curled up within a very small radius, making it a precursor to modern string theory.
It is unable to resolve the fact that all neutrinos have left-handed chirality while anti-neutrinos are right-handed in nature, and it makes little sense when applied to quantum mechanics. Taking electromagnetism to be the curvature of the fourth dimension of space, as gravity is of the third dimension in general relativity, one of its namesakes theorized that this dimension is undetectable due to being curled up within a very small radius, making it a precursor to modern string theory. FTP, name this theory which attempted to unify gravity and electromagnetism, one of the earliest examples of a grand unification theory, named for two mathematicians.
It is unable to resolve the fact that all neutrinos have left-handed chirality while anti-neutrinos are right-handed in nature, and it makes little sense when applied to quantum mechanics.
Kaluza-Klein theory