Non-perturbative propagators in quantum gravity

Understand

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.