| Constraints on Scalar-Tensor Theories of Gravity from Density Perturbations in Inflationary Cosmology (2007) | |||||||||||||
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| 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 REVT E X e-mail: chiba@yukawa.kyoto-u.ac.jp I. INTRODUCTION Inflationary cosmology gives a natural explanation for the horizon, flatness, homogeneity, and monopole problems [1]. In its simplest form, inflation with a single scalar field predicts an approximately scale-invariant spectrum of Gaussian adiabatic density perturbations [2]. If other fields are present, however, primordially isocurvature perturbations may also be generated to leave an imprint on the universe ... | |||||||||||||
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