Effective constrained scalar-Gauss-Bonnet inflation yields ns ≃ 0.958 and r ≃ 2.7×10^{-4} with the exact theory eliminating propagating scalar degrees of freedom via vanishing lapse perturbation and ḋR=0.
Rectifying Einstein-Gauss-Bonnet Inflation in View of GW170817
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The paper reviews cosmological tensions including the H0 and S8 discrepancies and explores new physics models that could explain them.