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2017

Generalized Slow Roll in the Unified Effective Field Theory of Inflation

Motohashi, Hayato, Hu, Wayne

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We provide a compact and unified treatment of power spectrum observables for the effective field theory (EFT) of inflation with the complete set of operators that lead to second-order equations of motion in metric perturbations in both space and time derivatives, including Horndeski and GLPV theories.

We relate the EFT operators in ADM form to the four additional free functions of time in the scalar and tensor equations.
Using the generalized slow roll formalism, we show that each power spectrum can be described by an integral over a single source that is a function of its respective sound horizon.
With this correspondence, existing model independent constraints on the source function can be simply reinterpreted in the more general inflationary context.

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