Primordial spectra from sudden turning trajectory

Abstract

Effects of heavy fields on primordial spectra of curvature perturbations are discussed in inflationary models with a sudden turning trajectory. When heavy fields are excited after the sudden turn and oscillate around the bottom of the potential, the following two effects are generically induced: deformation of the inflationary background spacetime and conversion interactions between adiabatic and isocurvature perturbations, both of which can affect the primordial density perturbations. In this paper, we calculate primordial spectra in inflationary models with sudden turning potentials taking into account both of the two effects appropriately. We find that there are some non-trivial correlations between the two effects in the power spectrum and, as a consequence, the primordial scalar power spectrum has a peak around the scale exiting the horizon at the turn. Though both effects can induce parametric resonance amplifications, they are shown to be canceled out for the case with the canonical kinetic terms. The peak feature and the scale dependence of bispectra are also discussed.

58 pages, 22 figures; v2: minor revision, published version

References in corpus (10)

• The Effective Field Theory of Inflation
• Mass hierarchies and non-decoupling in multi-scalar field dynamics
• Heavy fields, reduced speeds of sound and decoupling during inflation
• Strongly Coupled Perturbations in Two-Field Inflationary Models
• Curvature Perturbation Spectrum in Two-field Inflation with a Turning Trajectory
• Energy Transfer in Multi Field Inflation and Cosmological Perturbations
• Effective field theory of weakly coupled inflationary models
• Oscillatory features in the curvature power spectrum after a sudden turn of the inflationary trajectory
• On Non-Gaussianities in Two-Field Poly-Instanton Inflation
• Coupling structure of multi-field primordial perturbations

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