Constraints from Innation on Scalar{tensor Gravity Theories

We show how observations of the perturbation spectra produced during innation may be used to constrain the parameters of general scalar-tensor theories of gravity, which include both an innaton and dilaton eld. An interesting feature of these models is the possibility that the curvature perturbations on super-horizon scales may not be constant due to non-adiabatic perturbations of the two elds. Within a given model, the tilt and relative amplitude of the scalar and tensor perturbation spectra gives constraints on the parameters of the gravity theory, which may be comparable with those from primordial nucleosynthesis and post-Newtonian experiments.