Curvature Perturbations and non-Gaussianities from Waterfall Phase Transition during Inflation

Abstract

We consider a variant of hybrid inflation where the waterfall phase transition happens during inflation. By adjusting the parameters associated with the mass of the waterfall field we arrange that the phase transition is not sharp so inflation can proceed for about 50-60 e-folds after the waterfall phase transition. We show that one can work in the limit where the quantum back-reactions are subdominant compared to the classical back-reactions. It is shown that significant amount of large scale curvature perturbations are induced from the entropy perturbations. The curvature perturbations spectral index is either blue or red depending on whether the mode of interest leaves the horizon before the phase transition or after the phase transition. This can have interesting observational consequences on CMB. The non-Gaussianity parameter $f_{NL}$ is calculated to be $\lesssim 1$ but much bigger than the slow-roll parameters.

minor changes, references added, CQG published version

References in corpus (19)

• Observational Signatures and Non-Gaussianities of General Single Field Inflation
• Generation and Characterization of Large Non-Gaussianities in Single Field Inflation
• Multi-brid inflation and non-Gaussianity
• Non-Gaussianity from Preheating
• New Universal Local Feature in the Inflationary Perturbation Spectrum
• Large non-Gaussianity from multi-brid inflation
• Cosmological Fluctuations from Infra-Red Cascading During Inflation
• Primordial Non-Gaussianity in Multi-Scalar Slow-Roll Inflation
• Non-Gaussianity from Instant and Tachyonic Preheating
• Nongaussianity from Tachyonic Preheating in Hybrid Inflation
• On the Issue of the ζSeries Convergence and Loop Corrections in the Generation of Observable Primordial Non-Gaussianity in Slow-Roll Inflation. Part I: the Bispectrum
• On Features and Nongaussianity from Inflationary Particle Production
• Curvature perturbation from symmetry breaking the end of inflation
• Non-gaussianity for a Two Component Hybrid Model of Inflation
• Nongaussianity from Particle Production During Inflation
• Non-Gaussianity of superhorizon curvature perturbations beyond $\delta$ N formalism
• A Theory of a Spot
• Analytical Study of Mode Coupling in Hybrid Inflation
• Curvature perturbation spectrum from false vacuum inflation

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• Massive Primordial Black Holes from Hybrid Inflation as Dark Matter and the seeds of Galaxies
• Curvature Perturbation Spectrum in Two-field Inflation with a Turning Trajectory
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• Fast Computation of Bispectrum Features with Generalized Slow Roll
• The hybrid inflation waterfall and the primordial curvature perturbation
• The Effective Field Theory of Inflation Models with Sharp Features
• Stochastic Effects in Hybrid Inflation
• Non-Gaussianity from the hybrid potential
• The Importance of Slow-roll Corrections During Multi-field Inflation
• Testing Inflation and Curvaton Scenarios with CMB Distortions
• Issues on Generating Primordial Anisotropies at the End of Inflation
• Primordial Anisotropies in Gauged Hybrid Inflation
• Power Spectra beyond the Slow Roll Approximation in Theories with Non-Canonical Kinetic Terms
• Contribution of the hybrid inflation waterfall to the primordial curvature perturbation
• Curvature perturbation spectra from waterfall transition, black hole constraints and non-Gaussianity
• Fluid Inflation
• Recursive Stochastic Effects in Valley Hybrid Inflation
• Curvature perturbation and waterfall dynamics in hybrid inflation
• Perturbative Unitarity of Inflationary Models with Features
• Slow Roll during the Waterfall Regime: The Small Coupling Window for SUSY Hybrid Inflation
• Local Features with Large Spiky non-Gaussianities during Inflation
• Towards Constraining Affleck-Dine Baryogenesis
• Position Space CMB Anomalies from Multi-Stream Inflation
• New Horizons in Cosmology with Spectral Distortions of the Cosmic Microwave Background
• Dynamics of Cosmological Perturbations in Multi-Speed Inflation
• Jump in fluid properties of inflationary universe to reconcile scalar and tensor spectra
• Updated Constraints on Large Field Hybrid Inflation
• Lattice Simulation of Multi-Stream Inflation
• Effects of Variable Newton Constant During Inflation