Cosmological Perturbations From Inhomogeneous Reheating, Freeze-Out, and Mass Domination

Abstract

We generalize a recently proposed mechanism for the origin of primordial metric perturbations in inflationary models. Quantum fluctuations of light scalar fields during inflation give rise to super-horizon fluctuations of masses and reaction rates of various particles. Reheating, freeze-out, and matter-domination processes become inhomogeneous and generate super-horizon metric perturbations. We also calculate the degree of non-Gaussianity $f_{nl}$ for this new model of cosmological perturbations. The precise value of $f_{nl}$ depends on the specific models, but $|f_{nl}|\sim$few is a natural lower bound for our mechanisms. This is much larger than the currently assumed theoretical value $f_{nl}\sim tilt\lesssim 0.05$, and is thought to be observable. In a particularly attractive model of inhomogeneous mass-domination, the non-Gaussianity of perturbations generated by our mechanism is simply $f_{nl}=5$, irrespective of the detailed structure of the underlying field theory.

13 pages

References in corpus (4)

• First Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Determination of Cosmological Parameters
• Non-Gaussian features of primordial fluctuations in single field inflationary models
• First Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Tests of Gaussianity
• A new mechanism for generating density perturbations from inflation

Cited by in corpus (157)

• Seven-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• Wilkinson Microwave Anisotropy Probe (WMAP) Three Year Results: Implications for Cosmology
• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• Non-Gaussianity from Inflation: Theory and Observations
• Inflation Dynamics and Reheating
• Planck 2015 results. XVII. Constraints on primordial non-Gaussianity
• The shape of non-Gaussianities
• Planck 2013 Results. XXIV. Constraints on primordial non-Gaussianity
• Hilltop Inflation
• New Ekpyrotic Cosmology
• Imprints of a Primordial Preferred Direction on the Microwave Background
• Galilean Genesis: an alternative to inflation
• Hunting for Primordial Non-Gaussianity in the Cosmic Microwave Background
• The bispectrum of galaxies from high-redshift galaxy surveys: primordial non-Gaussianity and non-linear galaxy bias
• Fibre Inflation: Observable Gravity Waves from IIB String Compactifications
• Non-Gaussianity in the modulated reheating scenario
• The Null Energy Condition and its violation
• Generating the curvature perturbation at the end of inflation
• Large-scale Bias and Efficient Generation of Initial Conditions for Non-Local Primordial Non-Gaussianity
• Review of local non-Gaussianity from multi-field inflation
• Planck 2018 results. IX. Constraints on primordial non-Gaussianity
• Can a vector field be responsible for the curvature perturbation in the Universe?
• Enhancement of Gravitational Waves Induced by Scalar Perturbations due to a Sudden Transition from an Early Matter Era to the Radiation Era
• Non-gaussianity from the second-order cosmological perturbation
• Inflation, Cosmic Perturbations and Non-Gaussianities
• Operator Product Expansion of Inflationary Correlators and Conformal Symmetry of de Sitter
• Primordial Non-Gaussianity and Analytical Formula for Minkowski Functionals of the Cosmic Microwave Background and Large-scale Structure
• Quantum corrections to slow roll inflation and new scaling of superhorizon fluctuations
• Local non-Gaussianity from inflation
• CMB Anisotropies at Second Order I
• Primordial Black Holes from the inflating curvaton
• Limits on Primordial Non-Gaussianity from Minkowski Functionals of the WMAP Temperature Anisotropies
• Interacting Dark Energy and Cosmological Equations of State
• Primordial non-Gaussianities in general modified gravitational models of inflation
• CMB Anisotropies at Second-Order II: Analytical Approach
• Constraints on Single-Field Inflation from the BOSS Galaxy Survey
• Models of inflation liberated by the curvaton hypothesis
• Optimal Estimation of Non-Gaussianity
• Cosmological Fluctuations from Infra-Red Cascading During Inflation
• 1-loop Perturbative Corrections to the Matter and Galaxy Bispectrum with non-Gaussian Initial Conditions
• Cosmology of the Very Early Universe
• The cosmic microwave background temperature bispectrum from scalar perturbations induced by primordial magnetic fields
• Non-gaussianity and cosmic uncertainty in curvaton-type models
• Can the curvaton paradigm accommodate a low inflation scale?
• On Features and Nongaussianity from Inflationary Particle Production
• Holographic Non-Gaussianity
• Non-Gaussianity in Two-Field Inflation
• Lectures on inflation and cosmological perturbations
• Particle decay during inflation: self-decay of inflaton quantum fluctuations during slow roll
• Non-Gaussianity and the Cosmic Microwave Background Anisotropies
• Multiple Fields in Stochastic Inflation
• Non-Gaussianity of quantum fields during inflation
• On the generation of density perturbations at the end of inflation
• Large Non-Gaussianity Implication for Curvaton Scenario
• Elastic Inflation
• Enhancement of Non-Gaussianity after Inflation
• The CMB bispectrum in the squeezed limit
• Curvature Perturbations from Broken Symmetries
• String moduli inflation: an overview
• Critical Number of Fields in Stochastic Inflation
• Primordial non-Gaussianity in the large scale structure of the Universe
• Preheating and the non-gaussianity of the curvature perturbation
• Non-Gaussianity in the Cosmic Microwave Background Anisotropies at Recombination in the Squeezed limit
• Non-standard primordial fluctuations and nongaussianity in string inflation
• The Four-point Correlator in Multifield Inflation, the Operator Product Expansion and the Symmetries of de Sitter
• Curvatons in Supersymmetric Models
• The Effect of Primordial Non--Gaussianity on the Topology of Large-Scale Structure
• Limits on Isocurvature Perturbations from Non-Gaussianity in WMAP Temperature Anisotropies
• Modulated Reheating and Large Non-Gaussianity in String Cosmology
• Primordial non-Gaussianities after Planck 2015: an introductory review
• Nongaussianity from Particle Production During Inflation
• Cosmic shear bispectrum from second-order perturbations in General Relativity
• Anomalous Dimensions and Non-Gaussianity
• Supergravity inspired Vector Curvaton
• Topological Curvatons
• Non-Gaussianity of scalar perturbations generated by conformal mechanisms
• Primordial non-Gaussianity: local curvature method and statistical significance of constraints on f_NL from WMAP data
• Limits on Second-Order Non-Gaussianity from Minkowski Functionals of WMAP Data
• Squeezed Bispectrum in the $\delta N$ Formalism: Local Observer Effect in Field Space
• Seeding of Primordial Perturbations During a Decelerated Expansion
• Cosmological density perturbations from conformal scalar field: infrared properties and statistical anisotropy
• On the non-Gaussianity from Recombination
• Dark Matter via Many Copies of the Standard Model
• Cosmological Perturbations from the Standard Model Higgs
• Non-Abelian dynamics in the resonant decay of the Higgs after inflation
• Cosmological perturbations from inhomogeneous preheating and multi-field trapping
• Scenarios of modulated perturbations
• Hybrid Inflation without Flat Directions and without Primordial Black Holes
• The scale of gravity and the cosmological constant within a landscape
• Scalar perturbations in conformal rolling scenario with intermediate stage
• Gravitino production from reheating in split supersymmetry
• Planck constraints on Higgs modulated reheating of renormalization group improved inflation
• Preheating in Dirac-Born-Infeld inflation
• Non-Gaussian Mode Coupling and the Statistical Cosmological Principle
• Cosmological perturbations from an inhomogeneous phase transition
• Fluctuating annihilation cross sections and the generation of density perturbations
• Inflationary Predictions and Moduli Masses
• Testing models of inflation with CMB non-gaussianity
• Tachyon Mediated Non-Gaussianity
• Generating curvature perturbations with or without MSSM flat directions
• Scale-dependent CMB asymmetry from primordial configuration
• Evolution of the curvature perturbations during warm inflation
• Primordial feature constraints from BOSS+eBOSS
• Inhomogeneous reheating scenario with low scale inflation and/or MSSM flat directions
• Kinetic Gravity Braiding and axion inflation
• Position Space CMB Anomalies from Multi-Stream Inflation
• Spotted Inflation
• Delta-N formalism for the evolution of the curvature perturbations in generalized multi-field inflation
• Multipoint correlators in multifield cosmology
• Duality invariance and cosmological dynamics
• Measuring ultra-large scale effects in the presence of 21cm intensity mapping foregrounds
• Remote Inflation: Hybrid-like inflation without hybrid-type potential
• Hybrid Curvatons from Broken Symmetry
• The inflationary origin of the Cold Spot anomaly
• Revisiting non-Gaussianity of multiple-field inflation from the field equation
• Curvaton Dynamics Revisited
• Large Density Perturbations from Reheating to Standard Model particles due to the Dynamics of the Higgs Boson during Inflation
• Adiabatic versus Isocurvature Non--Gaussianity
• Modulated preheating and isocurvature perturbations
• Remote Inflation as hybrid-like sneutrino/MSSM inflation
• Light Scalars and the Generation of Density Perturbations During Preheating or Inflaton Decay
• Reheating mechanism of Curvaton with Nonminimal Derivative Coupling to Gravity
• Non-Gaussianity in rapid-turn multi-field inflation
• Effect of intermediate Minkowskian evolution on CMB bispectrum
• Right-handed neutrinos as the source of density perturbations
• Quintessential Isocurvature in Separate Universe Simulations
• New developments on embedding inflation in gauge theory and particle physics
• Conformal Universe as false vacuum decay
• Statistics of the excursion sets in models with local primordial non-Gaussianity
• The end of locked inflation
• The Origin of the Large-Scale Structure in the Universe: Theoretical and Statistical Aspects
• Towards conformal cosmology
• Scalar Perturbation Spectra in an Emergent Cosmological Island
• Constraints on variations in inflaton decay rate from modulated preheating
• Thermal non-Gaussianity in Near-Milne universe
• "Old" Locked Inflation
• Generation of perturbation after multi-field inflation
• Generating cosmological perturbations with mass variations
• Affleck-Dine baryogenesis with modulated reheating
• Cosmological Perturbations During Radion Stabilization
• Can Horndeski Genesis be Nonpathological?
• Delta-N Formalism for Curvaton with Modulated Decay
• Curvature perturbation from velocity modulation
• Primordial non-Gaussianity from the Effects of the Standard Model Higgs during Reheating after Inflation
• On Primordial Perturbations of Test Scalar Fields
• Zonal Modes of Cosmic Microwave Background Temperature Maps
• Compactification driven Hilltop Inflation in Einstein-Yang-Mills
• Reheating dynamics affects non-perturbative decay of spectator fields
• Thermal Inflation with a Thermal Waterfall Scalar Field Coupled to a Light Spectator Scalar Field
• The quantum origin of cosmic structure: theory and observations
• Generation of scale invariant density perturbations in a conformally invariant Inert Higgs doublet model
• Pseudo-conformal Universe: late-time contraction and generation of tensor modes
• Hidden in the background: a local approach to CMB anomalies
• Post-Inflationary Curvature Perturbations
• Non-Gaussianity of Large-Scale Cosmological Perturbations
• Inhomogeneous Reheating Scenario with DBI fields
• Aspects of inflation and the very early universe