Non-Gaussianity from resonant curvaton decay

Abstract

We calculate curvature perturbations in the scenario in which the curvaton field decays into another scalar field via parametric resonance. As a result of a nonlinear stage at the end of the resonance, standard perturbative calculation techniques fail in this case. Instead, we use lattice field theory simulations and the separate universe approximation to calculate the curvature perturbation as a nonlinear function of the curvaton field. For the parameters tested, the generated perturbations are highly non-Gaussian and not well approximated by the usual fNL parameterisation. Resonant decay plays an important role in the curvaton scenario and can have a substantial effect on the resulting perturbations.

25 pages, 4 figures, 2 tables; acknowledgments of financial support added, no further changes

References in corpus (20)

• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• Observational Signatures and Non-Gaussianities of General Single Field Inflation
• Generation and Characterization of Large Non-Gaussianities in Single Field Inflation
• Detection of primordial non-Gaussianity (fNL) in the WMAP 3-year data at above 99.5% confidence
• Primordial perturbations and non-Gaussianities in DBI and general multi-field inflation
• Primordial Curvature Fluctuation and Its Non-Gaussianity in Models with Modulated Reheating
• Multi-brid inflation and non-Gaussianity
• Non-Gaussianity from Preheating
• A numerical study of non-gaussianity in the curvaton scenario
• Non-Gaussian Spikes from Chaotic Billiards in Inflation Preheating
• Non-Gaussianity beyond slow roll in multi-field inflation
• Large non-Gaussianity from multi-brid inflation
• Non-Gaussianity from Instant and Tachyonic Preheating
• Lattice calculation of non-Gaussianity from preheating
• Nongaussianity from Tachyonic Preheating in Hybrid Inflation
• On the full trispectrum in single field DBI-inflation
• Primordial non-Gaussianity from two curvaton decays
• Non-Gaussianity from massless preheating
• The Subdominant Curvaton
• Non-linear Preheating with Scalar Metric Perturbations

Cited by in corpus (37)

• Cosmology and Fundamental Physics with the Euclid Satellite
• Cosmology and fundamental physics with the Euclid satellite
• Nonperturbative Dynamics Of Reheating After Inflation: A Review
• Hunting for Primordial Non-Gaussianity in the Cosmic Microwave Background
• Scale-dependent non-Gaussianity probes inflationary physics
• Scale dependence of local f_NL
• Anisotropies in the Gravitational Wave Background from Preheating
• Non-Gaussian Fingerprints of Self-Interacting Curvaton
• Sloan Digital Sky Survey III Photometric Quasar Clustering: Probing the Initial Conditions of the Universe using the Largest Volume
• On the Anisotropy of the Gravitational Wave Background from Massless Preheating
• Non-Gaussianity from the hybrid potential
• Non-Gaussianity in single field models without slow-roll
• Constraining the initial conditions of the Universe using large scale structure
• Path Integral for Inflationary Perturbations
• Strongly scale-dependent polyspectra from curvaton self-interactions
• Reheating, Multifield Inflation and the Fate of the Primordial Observables
• PyCOOL - a Cosmological Object-Oriented Lattice code written in Python
• Curvaton Decay by Resonant Production of the Standard Model Higgs
• Non-Gaussianity and Gravitational Waves from Quadratic and Self-interacting Curvaton
• A Cosmic Microscope for the Preheating Era
• The minimal curvaton-higgs model
• Influence of Reheating on the Trispectrum and its Scale Dependence
• The primordial curvature perturbation from lattice simulations
• Curvaton and the inhomogeneous end of inflation
• Electrically charged curvaton
• Novel mechanism for CMB modulation in the Standard Model
• Local Scale-Dependent Non-Gaussian Curvature Perturbations at Cubic Order
• Non-perturbative $\delta N$
• Curvaton preheating revisited
• Thermal blocking of preheating
• The TeV-mass curvaton
• Curvaton scenarios with inflaton decays into curvatons
• Supersymmetric hybrid inflation with a light scalar
• Higgs-like spectator field as the origin of structure
• Quantifying the 'naturalness' of the curvaton model
• Curvature perturbations from vacuum transition during inflation
• Curvature perturbations from preheating with scale dependence