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Fast Computation of Bispectrum Features with Generalized Slow Roll
We develop a fast technique based on the generalized slow-roll (GSR) approach for computing the curvature bispectrum of inflationary models with features. We show that all triangle configurations can be expressed in terms of three simple integrals over the inflationary background with typical accuracy of better than $\ensuremath{\sim}20%$. With a …