Curvature Perturbation Spectrum in Two-field Inflation with a Turning Trajectory

Abstract

We revisit a two-component inflaton model with a turning trajectory in the field space, where the field slowly rolls down along the trajectory. We consider the case when the effective mass in the direction perpendicular to the trajectory, namely the isocurvature direction, is either of the same order as or much larger than the Hubble parameter. Assuming that the turning angular velocity is small, we compute analytically the corrections to the power spectrum of curvature perturbation caused by the mediation of the heavy isocurvature perturbation, and compare our analytic results with the numerical ones. Especially, when M_{eff}^2>>H^2, we find that it is proportional to M_{eff}^{-2}. This result is consistent with the one obtained previously by an effective field theory approach.

20 pages, 5 figures, minor revision on calculations

References in corpus (4)

• Strongly Coupled Perturbations in Two-Field Inflationary Models
• Multifield DBI Inflation and Non-Gaussianities
• Waterfall field in hybrid inflation and curvature perturbation
• DBI N-flation

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