Fast computation of first-order feature-bispectrum corrections

Peter Adshead, Wayne Hu

Research output: Contribution to journalArticlepeer-review


Features in the inflaton potential that are traversed in much less than an e-fold of the expansion can produce observably large non-Gaussianity. In these models first-order corrections to the curvature mode function evolution induce effects at second order in the slow-roll parameters that are generically greater than ∼10% and can reach order unity for order unity power spectrum features. From a complete first-order expression in generalized slow roll, we devise a computationally efficient method that is as simple to evaluate as the leading-order one and implements consistency relations in a controlled fashion. This expression matches direct numerical computation for step potential models of the dominant bispectrum configurations to better than 1% when features are small and 10% when features are order unity.

Original languageEnglish (US)
Article number103531
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Issue number10
StatePublished - May 29 2012
Externally publishedYes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)


Dive into the research topics of 'Fast computation of first-order feature-bispectrum corrections'. Together they form a unique fingerprint.

Cite this