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2011

Fast Computation of Bispectrum Features with Generalized Slow Roll

Adshead, Peter, Hu, Wayne, Dvorkin, Cora et al.

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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 ~20%.
With a first order GSR approach the typical accuracy can be improved to better than the 5% level.
We illustrate this technique with the step potential model that has been invoked to explain the WMAP temperature power spectrum glitches at ell ~ 20-40 and show that the maximum likelihood model falls short of observability by more than a factor of 100 in amplitude.

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