Non-Gaussianity in single field models without slow-roll

Johannes Noller, Joao Magueijo

Research output: Contribution to journalArticlepeer-review


We investigate non-Gaussianity in general single field models without assuming slow-roll conditions or the exact scale invariance of the scalar power spectrum. The models considered include general single field inflation (e.g. Dirac-Born-Infeld and canonical inflation) as well as bimetric models. We compute the full non-Gaussian amplitude A, its size ƒNL, its shape, and the running with scale nNG. In doing so we show that observational constraints allow significant violations of slow-roll conditions and we derive explicit bounds on slow-roll parameters for fast-roll single field scenarios. A variety of new observational signatures is found for models respecting these bounds. We also explicitly construct concrete model implementations giving rise to this new phenomenology.
Original languageEnglish
Article number103511
JournalPhysical Review D
Publication statusPublished - 6 May 2011


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