Oscillatory features in the curvature power spectrum after a sudden turn of the inflationary trajectory

Abstract

In the context of two-field inflation characterized by a light direction and a heavy direction, we revisit the question of the impact of the massive modes on the power spectrum produced after a turn in the inflationary trajectory. We consider in particular the resonant effect due to the background oscillations following a sharp turn. Working in the mass basis, i.e. in the basis spanned by the eigenvectors of the effective mass matrix for the perturbations, we provide an analytical estimate of the resonant effect, using the in-in formalism. In comparison with earlier estimates, we find the same the spectral dependence but a smaller amplitude. We also compute, again via the in-in formalism, the effect of the direct coupling between the light and heavy modes at the instant of the turn and confirm our previous results obtained via a different method.

17 pages, 5 figures

References in corpus (15)

• Primordial Non-Gaussianities from Inflation Models
• Generation and Characterization of Large Non-Gaussianities in Single Field Inflation
• Quantum Contributions to Cosmological Correlations II: Can These Corrections Become Large?
• Primordial perturbations and non-Gaussianities in DBI and general multi-field inflation
• Perturbations in generalized multi-field inflation
• Curvature and isocurvature perturbations in two-field inflation
• Primordial fluctuations and non-Gaussianities in multi-field DBI 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
• Non-gaussianity of inflationary field perturbations from the field equation
• Effective field theory of weakly coupled inflationary models
• Searching for Standard Clocks in the Primordial Universe
• A Tree Theorem for Inflation

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