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We derive the consistency relations for a chaotic inflation model with a non-minimal coupling to gravity. For a quadratic potential in the limit of a small non-minimal coupling parameter $xi$ and for a quartic potential without assuming small $xi$, we give the consistency relations among the spectral index $n_s$, the tensor-to-scalar ratio $r$ and the running of the spectral index $alpha$. We find that unlike $r$, $alpha$ is less sensitive to $xi$. If $r<0.1$, then $xi$ is constrained to $xi<0$ and $alpha$ is predicted to be $alphasimeq -8times 10^{-4}$ for a quartic potential. For a general monomial potential, $alpha$ is constrained in the range $-2.7times 10^{-3}<alpha< -6times 10^{-4}$ as long as $|xi|leq 10^{-3}$ if $r<0.1$.
Consistency relations for chaotic inflation with a monomial potential and natural inflation and hilltop inflation are given which involve the scalar spectral index $n_s$, the tensor-to-scalar ratio $r$ and the running of the spectral index $alpha$. T
We study models of inflation where the scalar field $phi$ that drives inflation is coupled non-minimally to gravity via $xi phi^2 R$, or where the gravity sector is enlarged by an $R^2$ term. We consider the original Higgs inflation, Starobinsky inflation, and two differe
We study infrared effects in perturbation theory for large-scale structure coupled to the effective field theory of dark energy, focusing on, in particular, Degenerate Higher-Order Scalar-Tensor (DHOST) theories. In the subhorizon, Newtonian limit, D
We study perturbation theory for large-scale structure in the most general scalar-tensor theories propagating a single scalar degree of freedom, which include Horndeski theories and beyond. We model the parameter space using the effective field theor
We study the consequences of spatial coordinate transformation in multi-field inflation. Among the spontaneously broken de Sitter isometries, only dilatation in the comoving gauge preserves the form of the metric and thus results in quantum-protected