The Curvaton Web

Abstract

We discuss nontrivial features of the large scale structure of the universe in the simplest curvaton model proposed in our paper astro-ph/9610219. The amplitude of metric perturbations in this model takes different values in different parts of the universe. The spatial distribution of the amplitude looks like a web consisting of exponentially large cells. Depending on the relation between the cell size l_0 and the scale of the horizon l_H, one may either live in a part of the universe dominated by gaussian perturbations (inside a cell with l_0 >> l_H), or in the universe dominated by nongaussian perturbations (for l_0 << l_H). We show that the curvaton contribution to the total amplitude of adiabatic density perturbations can be strongly suppressed if the energy density of the universe prior to the curvaton decay was dominated not by the classical curvaton field but by the curvaton particles produced during reheating. We describe the curvaton-inflaton transmutation effect: The same field in different parts of the universe may play either the role of the curvaton or the role of the inflaton. Finally, we discuss an interplay between the curvaton web and anthropic considerations in the string theory landscape.

15 pages, 3 figures, references added, discussion of long-wavelenth perturbations expanded

References in corpus (30)

• de Sitter Vacua in String Theory
• Towards the Theory of Reheating After Inflation
• Reheating after Inflation
• Generating the curvature perturbation without an inflaton
• Quantization of Four-form Fluxes and Dynamical Neutralization of the Cosmological Constant
• Hybrid Inflation
• First Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Implications for Inflation
• Effects of Cosmological Moduli Fields on Cosmic Microwave Background
• The primordial density perturbation in the curvaton scenario
• Nongaussian Isocurvature Perturbations from Inflation
• The statistics of string/M theory vacua
• Distributions of flux vacua
• From the Big Bang Theory to the Theory of a Stationary Universe
• A new mechanism for generating density perturbations from inflation
• Predictions from Quantum Cosmology
• What does inflation really predict?
• Fluctuations of the Gravitational Constant in the Inflationary Brans-Dicke Cosmology
• Why is the CMB fluctuation level 10^{-5}?
• Observational constraints on the curvaton model of inflation
• Basic results in Vacuum Statistics
• Modulated fluctuations from hybrid inflation
• Stationarity of Inflation and Predictions of Quantum Cosmology
• Curvaton Dynamics
• The CDM isocurvature perturbation in the curvaton scenario
• Correlated Primordial Perturbations in Light of CMB and LSS Data
• Correlated isocurvature perturbations from mixed inflaton-curvaton decay
• Squeezing the window on isocurvature modes with the Lyman-alpha forest
• Evolution of primordial perturbations and a fluctuating decay rate
• Gravitational Particle Production and the Moduli Problem
• Non-Gaussianity in Multi-field Stochastic Inflation with the Scaling Approximation

Cited by in corpus (81)

• Planck 2015 results. XVII. Constraints on primordial non-Gaussianity
• Non-Gaussianity of the primordial perturbation in the curvaton model
• Particle physics models of inflation and curvaton scenarios
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• The shape of primordial non-Gaussianity and the CMB bispectrum
• Primordial non-Gaussianity and Bispectrum Measurements in the Cosmic Microwave Background and Large-Scale Structure
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• A Hemispherical Power Asymmetry from Inflation
• Review of local non-Gaussianity from multi-field inflation
• Boltzmann brains and the scale-factor cutoff measure of the multiverse
• Production of Purely Gravitational Dark Matter
• Superhorizon Perturbations and the Cosmic Microwave Background
• Conditions for large non-Gaussianity in two-field slow-roll inflation
• Inflation, Cosmic Perturbations and Non-Gaussianities
• Scale-dependent non-Gaussianity probes inflationary physics
• Primordial Black Holes from the inflating curvaton
• Inflating in a Better Racetrack
• Non-Gaussianity beyond slow roll in multi-field inflation
• Predicting the cosmological constant with the scale-factor cutoff measure
• Chaotic inflation and supersymmetry breaking
• Large non-Gaussianity from two-component hybrid inflation
• The curvature perturbation in a box
• The CMB Bispectrum
• A Scale-Dependent Power Asymmetry from Isocurvature Perturbations
• A-term inflation and the MSSM
• Non-Gaussianity from isocurvature perturbations
• Accidental Inflation in String Theory
• Non-Gaussianity in Two-Field Inflation
• Broken Isotropy from a Linear Modulation of the Primordial Perturbations
• The stochastic spectator
• The CMB asymmetry from inflation
• Large Non-Gaussianity Implication for Curvaton Scenario
• How many universes are in the multiverse?
• A General Analysis of Non-Gaussianity from Isocurvature Perturbations
• What can the observation of nonzero curvature tell us?
• Return of the Boltzmann Brains
• Constraints on Primordial Non-Gaussianity from a Needlet Analysis of the WMAP-5 Data
• Hilltop Non-Gaussianity
• Stationary Measure in the Multiverse
• Non-Gaussianity from the hybrid potential
• Non-Gaussianity from Symmetry
• A non-Gaussian landscape
• Dark Matter and Gravity Waves from a Dark Big Bang
• Large-scale anomalies in the cosmic microwave background as signatures of non-Gaussianity
• Measure Problem for Eternal and Non-Eternal Inflation
• Reheating, Multifield Inflation and the Fate of the Primordial Observables
• Non-Gaussianity from Isocurvature Perturbations : Analysis of Trispectrum
• On Non-Gaussianities in Multi-Field Inflation (N fields): Bi- and Tri-spectra beyond Slow-Roll
• Large-scale Perturbations from the Waterfall Field in Hybrid Inflation
• Supercurvaton
• Constraining Curvatonic Reheating
• The scale of gravity and the cosmological constant within a landscape
• Measuring the duration of inflation with the curvaton
• Spectral Index in Curvaton Scenario
• Non-Gaussian Mode Coupling and the Statistical Cosmological Principle
• Negative vacuum energy densities and the causal diamond measure
• Optimizing future experimental probes of inflation
• Cosmic Variance of the Spectral Index from Mode Coupling
• Non-Gaussianity in multiple three-form field inflation
• Large-scale anomalies of the CMB in the curvaton scenario
• Constraints on moduli cosmology from the production of dark matter and baryon isocurvature fluctuations
• Implications of the Planck bispectrum constraints for the primordial trispectrum
• Multi-fluid cosmology in Einstein gravity: analytical solutions
• Foreground influence on primordial non-Gaussianity estimates: needlet analysis of WMAP 5-year data
• Curvatons in Warped Throats
• Influence of Reheating on the Trispectrum and its Scale Dependence
• Bayesian evidence of the post-Planck curvaton
• Super cosmic variance from mode-coupling: A worked example
• Cosmological constraints on the curvaton web parameters
• Vacuum Sampling in the Landscape during Inflation
• What Planck does not tell us about inflation
• Coupling structure of multi-field primordial perturbations
• Particle Production during Inflation in Light of PLANCK
• Hemispherical Power Asymmetry of the Cosmic Microwave Background from a Remnant of a pre-Inflationary Topological Defect
• Curvaton scenarios with inflaton decays into curvatons
• Resolving primordial physics through correlated signatures
• The moduli problem at the perturbative level
• Adiabatic and Isocurvature Perturbation Projections in Multi-Field Inflation
• The R-axion and non-Gaussianity
• Quantifying the 'naturalness' of the curvaton model
• Gravity of Cosmological Perturbations in the CMB