  We employ non-perturbative renormalisation group methods to compute the full
momentum dependence of propagators in quantum gravity in general dimensions. We
disentangle all different graviton and Faddeev-Popov ghost modes and find
qualitative differences in the momentum dependence of their propagators. This
allows us to reconstruct the form factors quadratic in curvature from first
principles, which enter physical observables like scattering cross sections.
The results are qualitatively stable under variations of the gauge fixing
choice.
