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• W2065432356 abstract "High-energy modifications to general relativity introduce changes to the perturbations generated during inflation, and the latest high-precision cosmological data can be used to place constraints on such modified inflation models. Recently it was shown that Randall-Sundrum--type braneworld inflation leads to tighter constraints on quadratic and quartic potentials than in general relativity. We investigate how this changes with a Gauss-Bonnet correction term, which can be motivated by string theory. Randall-Sundrum models preserve the standard consistency relation between the tensor spectral index and the tensor-to-scalar ratio. The Gauss-Bonnet term breaks this relation, and also modifies the dynamics and perturbation amplitudes at high energies. We find that the Gauss-Bonnet term tends to soften the Randall-Sundrum constraints. The observational compatibility of the quadratic potential is strongly improved. For a broad range of energy scales, the quartic potential is rescued from marginal rejection. Steep inflation driven by an exponential potential is excluded in the Randall-Sundrum case, but the Gauss-Bonnet term leads to marginal compatibility for sufficient e-folds." @default.
• W2065432356 created "2016-06-24" @default.
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• W2065432356 date "2004-09-22" @default.
• W2065432356 modified "2023-09-27" @default.
• W2065432356 title "Observational constraints on braneworld inflation: The effect of a Gauss-Bonnet term" @default.
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• W2065432356 doi "https://doi.org/10.1103/physrevd.70.063525" @default.
• W2065432356 hasPublicationYear "2004" @default.
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