Gravity

In this chapter, we present the new model of the quantum field theory of gravitation which is, by now, properly included into the Lagrangian density of quantum electrodynamics. In this model of QED plus gravity, Dirac fields couple to the electromagnetic field A^μ as well as the gravitational field G. The gravity appears in the mass term as m(1 + gG)ψψ with the coupling constant of g, thus keeping the local gauge invariance of the total Lagrangian of QED plus gravity. Here, after a brief review of the new gravity model, we present the discussion of applying the new gravity model to the time shifts of various kinds of planet motions.

Keywords: gravity, Dirac equation for gravity, time shifts of Mercury, time shifts of earth motion, time shitts of GPS, general relativity, time shifts of comets.