Graviton-Photon Scattering

We use that the gravitational Compton scattering factorizes on the Abelian QED amplitudes to evaluate various gravitational Compton processes. We examine both the QED and gravitational Compton scattering from a massive spin-1 system by the use of helicity amplitudes. In the case of gravitational Compton scattering we show how the massless limit can be used to evaluate the cross-section for graviton-photon scattering and discuss the difference between photon interactions and the zero mass spin-1 limit. We show that the forward scattering cross-section for graviton photo-production has a very peculiar behaviour, differing from the standard Thomson and Rutherford cross-sections for a Coulomb-like potential