Correct light deflection in Weyl conformal gravity

The conformal gravity fit to observed galactic rotation curves requires gamma > 0. On the other hand, the conventional method for light deflection by galaxies gives a negative contribution to the Schwarzschild value for gamma > 0, which is contrary to observation. Thus, it is very important that the contribution to bending should in principle be positive, no matter how small its magnitude is. Here we show that the Rindler-Ishak method gives a positive contribution to Schwarzschild deflection for gamma > 0, as desired. We also obtain the exact local coupling term derived earlier by Sereno. These results indicate that conformal gravity can potentially test well against all astrophysical observations to date. DOI: 10.1103/PhysRevD.87.047503