On Non-Canonical Kinetic Terms and the Tilt of the Power Spectrum

Details On Non-Canonical Kinetic Terms and the Tilt of the Power Spectrum On Non-Canonical Kinetic Terms and the Tilt of the Power Spectrum

2010-05-24

arxiv.org/abs/1005.4347v2

Physics

High Energy Physics

High Energy Physics - Theory

typos corrected, discussion slightly modified, matches published version

Scientific paper

We argue that in models of inflation with two scalar fields and non-canonical kinetic terms there is a possibility of obtaining a red tilt of the power spectrum of curvature perturbations from noncanonicality-induced interactions between the curvature and isocurvature perturbations. We describe an extremely simple model realizing this idea, study numerically its predictions for the perturbations and discuss applications in realistic scenarios of inflation. We discuss to what extent in this model the scale of the inflationary potential can be decoupled from the amplitude of the density fluctuations.

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