Non-Perturbative Propagators in Quantum Gravity

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 that are 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.

Automated summary

Non-perturbative renormalisation group methods were employed to compute the momentum dependence of propagators in quantum gravity in general dimensions, revealing qualitative differences in the propagators of different graviton and Faddeev-Popov ghost modes. This allowed for the reconstruction of form factors quadratic in curvature from first principles, with results showing qualitative stability under variations of the gauge fixing choice.