Oskar Klein

… in 1919 and Swedish physicist Oskar Klein in 1925 proposed a four-dimensional spatial theory, after Einstein’s discovery of general relativity in 1916. In general relativity, gravity arises from the shape of spacetime. Kaluza and Klein showed that with additional dimensions, other forces such as electromagnetism could arise in the same…

…his theory, a Swedish theorist, Oskar Klein, proposed a slightly different kind of carrier for the weak force.