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We study the Faddeev-Popov ghost sector of asymptotically safe quantumgravity, which becomes non-perturbative in the ultraviolet. We point out thatnonzero matter-ghost couplings and higher-order ghost self-interactions existat a non-Gaussian fixed point for the gravitational couplings, i.e., in theultraviolet. Thus the ghost sector in this non-perturbative ultravioletcompletion does not keep the structure of a simple Faddeev-Popov determinant.We discuss implications of the new ghost couplings for the RenormalizationGroup flow in gravity, the form of the ultraviolet completion, and the relevantcouplings, i.e., free parameters, of the theory.

Faddeev-Popov ghosts in quantum gravity beyond perturbation theory