Constraints on Scalar-Tensor Theories of Gravity from Density Perturbations in Inflationary Cosmology
Spectra of density perturbations produced during chaotic inflation in scalartensor theories of gravity are calculated, taking both adiabatic and isocurvature modes into account. Comparing the predicted spectrum of the cosmic microwave background radiation anisotropies with the one observed by the COBE-DMR we calculate constraints on the parameters of these theories, which turn out to be stronger by an order-of-magnitude than those obtained from post-Newtonian experiments. PACS numbers: 04.50+h,98.80.-k Typeset using REVTEX e-mail: chiba@yukawa.kyoto-u.ac.jp 1