Quantum Gravity without General Relativity
  The quantum field theory of gravitation is constructed in terms of Lagrangian density of Dirac fields which couple to the electromagnetic field $A_\mu$ as well as the gravitational field $\cal G$. The gravity appears in the mass term as $ m(1+g {\cal G}) \bar{\psi}\psi $ with the coupling constant of $g$. In addition to the gravitational force between fermions, the electromagnetic field $A_\mu$ interacts with the gravity as the fourth order effects and its strength amounts to $\alpha$ times the gravitational force. Therefore, the interaction of photon with gravity is not originated from Einstein's general relativity which is entirely dependent on the unphysical assumption of the principle of equivalence. Further, we present a renormalization scheme for the gravity and show that the graviton stays massless. 
Takehisa Fujita