Four potential gravitation and its quantization

In the preceding theory of gravitation, the gravitation potential has been considered as a scalar potential having as its source the proper time density from rest mass. In the present amended theory, however, the gravitation potential is considered as a four potential like the electromagnetic four potential. The new source term is the four rest mass current density like the four electrical charge current density in the electromagnetic theory. That new theory yields essentially the same results as the former scalar theory. The Mercury perihelion like some other effects known from general relativity can be calculated likewise. Gravitational radiation can be calculated only up to a constant factor which is to be taken from general relativity. In the preceding theory, there had been a calculation error insofar; in principle, however there is no difference to the result of general relativity. There is still also a gravitational monopole radiation. The spin of the new gravitational field is also zero. Moreover, with the Dirac equation a relativistic quantum mechanical equation of gravitation is obtained, which in the classical limit coincides with the new classical theory. The new gravitational potential obviously can be quantized. In principle, the new gravitational potential can interact with the spin of the electron. However, free gravitational waves can not interact with the spin of the electron, also because free gravitational waves have no spin.