T. Chiba et al., IMPRINTS OF THE METRICALLY COUPLED DILATON ON DENSITY PERTURBATIONS IN INFLATIONARY COSMOLOGY, Nuclear physics. B, 530(1-2), 1998, pp. 304-324
Spectra of density perturbations produced during chaotic inflation are
calculated, taking both adiabatic and isocurvature modes into account
in a class of scalar-tensor theories of gravity in which the dilaton
is metrically coupled. Comparing the predicted spectrum of the cosmic
microwave background radiation anisotropies with the one observed by t
he COBE-DMR we calculate constraints on the parameters of these theori
es, which turn out to be stronger by an order-of-magnitude than those
obtained from post-Newtonian experiments, (C) 1998 Elsevier Science B.
V.