Faddeev-Popov ghosts in quantum gravity beyond perturbation theory

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Abstrakt

We study the Faddeev-Popov ghost sector of asymptotically safe quantum gravity, which becomes nonperturbative in the ultraviolet. We point out that nonzero matter-ghost couplings and higher-order ghost self-interactions exist at a non-Gaussian fixed point for the gravitational couplings, i.e., in the ultraviolet. Thus the ghost sector in this nonperturbative ultraviolet completion does not keep the structure of a simple Faddeev-Popov determinant. We discuss implications of the new ghost couplings for the renormalization group flow in gravity, the form of the ultraviolet completion, and the relevant couplings, i.e., free parameters, of the theory.

OriginalsprogEngelsk
Artikelnummer124016
TidsskriftPhysical Review D - Particles, Fields, Gravitation and Cosmology
Vol/bind87
Udgave nummer12
DOI
StatusUdgivet - 17. jun. 2013

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