Curvature and isocurvature perturbations in two-field inflation

Details Curvature and isocurvature perturbations in two-field inflation Curvature and isocurvature perturbations in two-field inflation

2007-04-02

arxiv.org/abs/0704.0212v2

JCAP 0707:014,2007

Physics

High Energy Physics

High Energy Physics - Theory

29 pages, 12 figures; v2: updated references, discussion extended, matches the published version

Scientific paper

10.1088/1475-7516/2007/07/014

We study cosmological perturbations in two-field inflation, allowing for non-standard kinetic terms. We calculate analytically the spectra of curvature and isocurvature modes at Hubble crossing, up to first order in the slow-roll parameters. We also compute numerically the evolution of the curvature and isocurvature modes from well within the Hubble radius until the end of inflation. We show explicitly for a few examples, including the recently proposed model of `roulette' inflation, how isocurvature perturbations affect significantly the curvature perturbation between Hubble crossing and the end of inflation.

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