Modulated inflation from kinetic term

Abstract

We study modulated inflation from kinetic term. Using the Mukhanov-Sasaki variable, it is possible to determine how mixing induced by the kinetic term feeds the curvature perturbation with the isocurvature perturbation. We show explicitly that the analytic result obtained from the evolution of the Mukhanov-Sasaki variable is consistent with the $\delta N$-formula. From our results, we find analytic conditions for the modulated fluctuation and the non-Gaussianity parameter.

15 pages, 1 figure, Accepted for publication in JCAP

References in corpus (33)

• Generating the curvature perturbation without an inflaton
• Acoustic Signatures in the Primary Microwave Background Bispectrum
• A General Analytic Formula for the Spectral Index of the Density Perturbations produced during Inflation
• Effects of Cosmological Moduli Fields on Cosmic Microwave Background
• Adiabatic and entropy perturbations from inflation
• A new mechanism for generating density perturbations from inflation
• Non-Gaussianity in multi-field inflation
• Metric perturbations in two-field inflation
• Generating the curvature perturbation at the end of inflation
• Curvature and isocurvature perturbations in two-field inflation
• Cosmological perturbations from multi-field inflation in generalized Einstein theories
• Inflationary models inducing non-Gaussian metric fluctuations
• Fast-Roll Inflation
• Constraints from Inflation on Scalar-Tensor Gravity Theories
• Modulated fluctuations from hybrid inflation
• Observational signatures of Jordan-Brans-Dicke theories of gravity
• Cosmological perturbations from varying masses and couplings
• Challenges in generating density perturbations from a fluctuating inflaton coupling
• Density Perturbations in Multifield Inflationary Models
• Generating the Curvature Perturbation at the End of Inflation in String Theory
• Non-tachyonic brane inflation
• New constraints on multi-field inflation with nonminimal coupling
• Low scale inflation and the curvaton mechanism
• Topological Curvatons
• Curvaton paradigm can accommodate multiple low inflation scales
• Cosmological perturbations from inhomogeneous preheating and multi-field trapping
• Boundary Inflation and the WMAP Data
• Hybrid Inflation without Flat Directions and without Primordial Black Holes
• Elliptic Inflation: Generating the curvature perturbation without slow-roll
• Hilltop Curvatons
• Brane inflation without slow-roll
• Hybrid Curvatons from Broken Symmetry
• Low scale inflation and the immediate heavy curvaton decay

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• Evolution of the curvature perturbations during warm inflation
• Non-Gaussianity in the inflating curvaton
• Spotted Inflation
• Delta-N formalism for the evolution of the curvature perturbations in generalized multi-field inflation
• Remote Inflation: Hybrid-like inflation without hybrid-type potential
• Modulated decay in the multi-component Universe
• Evolution of curvature perturbation in generalized gravity theories
• Remote Inflation as hybrid-like sneutrino/MSSM inflation
• Curvatons and inhomogeneous scenarios with deviation from slow-roll