Tilt and Running of Cosmological Observables in Generalized Single-Field Inflation

Details Tilt and Running of Cosmological Observables in Generalized Single-Field Inflation Tilt and Running of Cosmological Observables in Generalized Single-Field Inflation

2010-10-19

arxiv.org/abs/1010.3993v1

JCAP 1012:026,2010

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

20 pages, 4 figures

Scientific paper

10.1088/1475-7516/2010/12/026

Employing an effective field theory approach to inflationary perturbations, we analyze in detail the effect of curvature-generated Lagrangian operators on various observables, focusing on their running with scales. At quadratic order, we solve the equation of motion at next-to-leading leading order in a generalized slow-roll approximation for a very general theory of single-field inflation. We derive the resulting power spectrum, its tilt and running. We then focus on the contribution to the primordial non-Gaussianity amplitude f_{NL} sourced by a specific interaction term. We show that the running of f_{NL} can be substantially larger than what dictated by the slow-roll parameters.

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