DOCUMENT 12 ON KALUZA'S THEORY 67 2 VII g44 g11 x5 (Vierer-Potential) g15, g25, g35, g45 g55 (Druck) (kovariant) (Tensor) guv ds2 = guv dxu dxv ds2 (lokales Inertial-System) guv g = |guv| (Determinante) H H = guv T-0uB TBv0. (2) guv 6Tuv/6x0=0. (3) (2)