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We derive the first quantum gravitational corrections to the inflationarypower spectra for a general single-field scalar-tensor theory which includes anon-minimal coupling to gravity, a non-standard scalar kinetic term and anarbitrary potential of the scalar field. We obtain these corrections from asemiclassical expansion of the Wheeler-DeWitt equation, which, in turn, governsthe full quantum dynamics in the canonical approach to quantum gravity. Wediscuss the magnitude and relevance of these corrections, as well as theircharacteristic signature in the inflationary spectral observables. We compareour results to similar calculations performed for a minimally coupled scalarfield with a canonical kinetic term and discuss the impact of the non-minimalcoupling on the quantum gravitational corrections.

Quantum gravitational corrections to the inflationary power spectra in scalar-tensor theories