Frame-Independent Calculation of Spectral Indices from Inflation
arXiv:astro-ph/9507048
Abstract
Spectral indices from models of inflation which incorporate a Generalized Einstein Theory (GET) gravity sector are calculated to first order in a slow-roll expansion. By quantizing a suitably- generalized measure of the intrinsic curvature perturbation, the spectral indices as calculated in the Jordan frame now match those as calculated following a conformal transformation, in the Einstein frame.
12pp. Plain LaTeX; no figures