Local Features with Large Spiky non-Gaussianities during Inflation

Abstract

We provide a dynamical mechanism to generate localized features during inflation. The local feature is due to a sharp waterfall phase transition which is coupled to the inflaton field. The key effect is the contributions of waterfall quantum fluctuations which induce a sharp peak on the curvature perturbation which can be as large as the background curvature perturbation from inflaton field. Due to non-Gaussian nature of waterfall quantum fluctuations a large spike non-Gaussianity is produced which is narrowly peaked at modes which leave the Hubble radius at the time of phase transition. The large localized peaks in power spectrum and bispectrum can have interesting consequences on CMB anisotropies.

22 pages, 2 figures

References in corpus (25)

• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• Monodromy in the CMB: Gravity Waves and String Inflation
• Generation and Characterization of Large Non-Gaussianities in Single Field Inflation
• Non-Gaussianity from Preheating
• Non-Gaussianity from Step Features in the Inflationary Potential
• New Universal Local Feature in the Inflationary Perturbation Spectrum
• Non-Gaussian Spikes from Chaotic Billiards in Inflation Preheating
• Non-Gaussianity from Instant and Tachyonic Preheating
• Nongaussianity from Tachyonic Preheating in Hybrid Inflation
• Effects of particle production during inflation
• Hybrid inflation along waterfall trajectories
• On Features and Nongaussianity from Inflationary Particle Production
• Formation of primordial black holes from non-Gaussian perturbations produced in a waterfall transition
• The hybrid inflation waterfall and the primordial curvature perturbation
• Nongaussianity from Particle Production During Inflation
• Stochastic Effects in Hybrid Inflation
• The Importance of Slow-roll Corrections During Multi-field Inflation
• Wiggles in the cosmic microwave background radiation: echoes from non-singular cyclic-inflation
• Waterfall field in hybrid inflation and curvature perturbation
• No Large Scale Curvature Perturbations during Waterfall of Hybrid Inflation
• Fields Annihilation and Particles Creation in DBI inflation
• Analytical Study of Mode Coupling in Hybrid Inflation
• Primordial black hole formation and hybrid inflation
• Primordial black hole formation from non-Gaussian curvature perturbations
• Manifestly gauge invariant theory of the nonlinear cosmological perturbations in the leading order of the gradient expansion

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• Fluid Inflation
• Hybrid Quasi-Single Field Inflation
• Perturbative Unitarity of Inflationary Models with Features
• Multiple Inflationary Stages with Varying Equation of State
• Lensing as a Probe of Early Universe: from CMB to Galaxies
• Position Space CMB Anomalies from Multi-Stream Inflation
• Fingerprints of Anomalous Primordial Universe on the Abundance of Large Scale Structures
• Jump in fluid properties of inflationary universe to reconcile scalar and tensor spectra
• Effects of Variable Newton Constant During Inflation
• Ringing Non-Gaussianity from inflation with a step in the second derivative of the potential