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We present a complete formulation of the scalar bispectrum in the unifiedeffective field theory (EFT) of inflation, which includes the Horndeski andbeyond-Horndeski Gleyzes-Langlois-Piazza-Vernizzi classes, in terms of a set ofsimple one-dimensional integrals. These generalized slow-roll expressionsremain valid even when slow-roll is transiently violated and encompass allconfigurations of the bispectrum. We show analytically that our expressionsexplicitly preserve the squeezed-limit consistency relation beyond slow-roll.As an example application of our results, we compute the scalar bispectrum in amodel in which potential-driven G-inflation at early times transitions tochaotic inflation at late times, showing that our expressions accurately trackthe bispectrum when slow-roll is violated and conventional slow-rollapproximations fail.

Scalar Bispectrum Beyond Slow-Roll in the Unified EFT of Inflation