Primordial Curvature Fluctuation and Its Non-Gaussianity in Models with Modulated Reheating

Abstract

We investigate non-Gaussianity in the modulated reheating scenario where fluctuations of the decay rate of the inflaton generate adiabatic perturbations, paying particular attention to the non-linearity parameters $f_{\mathrm{NL}},{\tau }_{\mathrm{NL}}$ and $g_{\mathrm{NL}}$ as well as the scalar spectral index and tensor-to-scalar ratio which characterize the nature of the primordial power spectrum. We also take into account the pre-existing adiabatic perturbations produced from the inflaton fluctuations. It has been known that the non-linearity between the curvature perturbations and the fluctuations of the decay rate can yield non-Gaussianity at the level of $f_{\mathrm{NL}}\sim \mathcal{O}(1)$, but we find that the non-linearity between the decay rate and the modulus field which determines the decay rate can generate much greater non-Gaussianity. We also discuss a consistency relation among non-linearity parameters which holds in the scenario and find that the modulated reheating yields a different one from that of the curvaton model. In particular, they both can yield a large positive $f_{\mathrm{NL}}$ but with a different sign of $g_{\mathrm{NL}}$. This provides a possibility to discriminate these two competitive models by looking at the sign of $g_{\mathrm{NL}}$. Furthermore, we work on some concrete inflation models and investigate in what cases models predict the spectral index and the tensor-to-scalar ratio allowed by the current data while generating large non-Gaussianity, which may have many implications for model-buildings of the inflationary universe.

arXiv comment38 pages, 12 figures

References in corpus (35)

• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Likelihoods and Parameters from the WMAP data
• Generating the curvature perturbation without an inflaton
• A General Analytic Formula for the Spectral Index of the Density Perturbations produced during Inflation
• Universe Reheating after Inflation
• Adiabatic CMB perturbations in pre-big bang string cosmology
• Effects of Cosmological Moduli Fields on Cosmic Microwave Background
• A general proof of the conservation of the curvature perturbation
• A new mechanism for generating density perturbations from inflation
• Natural Chaotic Inflation in Supergravity
• Structure of Resonance in Preheating after Inflation
• Super-Horizon Scale Dynamics of Multi-Scalar Inflation
• Primordial non-gaussianities from multiple-field inflation
• Detection of primordial non-Gaussianity (fNL) in the WMAP 3-year data at above 99.5% confidence
• Non-Gaussianity in the modulated reheating scenario
• Primordial trispectrum from inflation
• Chaotic Inflation and Baryogenesis in Supergravity
• Probing String Theory with Modulated Cosmological Fluctuations
• Non-Gaussianity, Spectral Index and Tensor Modes in Mixed Inflaton and Curvaton Models
• Non-gaussianity from the second-order cosmological perturbation
• Mixed inflaton and curvaton perturbations
• Limits on Primordial Non-Gaussianity from Minkowski Functionals of the WMAP Temperature Anisotropies
• Models of inflation liberated by the curvaton hypothesis
• Natural Chaotic Inflation in Supergravity and Leptogenesis
• Constraints on a mixed inflaton and curvaton scenario for the generation of the curvature perturbation
• Relaxing Constraints on Inflation Models with Curvaton
• Implications of the Curvaton on Inflationary Cosmology
• Cosmic String from D-term Inflation and Curvaton
• Low scale inflation and the curvaton mechanism
• D-term chaotic inflation in supergravity
• Generating the primordial curvature perturbations in preheating
• New D-term chaotic inflation in supergravity and leptogenesis
• Low scale inflation and the immediate heavy curvaton decay
• Chaotic D-Term Inflation
• Reheating in Chaotic D-Term Inflation

Cited by in corpus (116)

• Hunting for Primordial Non-Gaussianity in the Cosmic Microwave Background
• Review of local non-Gaussianity from multi-field inflation
• Reheating and Post-inflationary Production of Dark Matter
• Non-Gaussianity, Spectral Index and Tensor Modes in Mixed Inflaton and Curvaton Models
• Inflaton Oscillations and Post-Inflationary Reheating
• Scale-dependent non-Gaussianity probes inflationary physics
• Supergravity based inflation models: a review
• Primordial non-Gaussianities in general modified gravitational models of inflation
• How warm are non-thermal relics? Lyman-$\alpha$ bounds on out-of-equilibrium dark matter
• Non-Gaussianity beyond slow roll in multi-field inflation
• Gravitational portals in the early Universe
• Large non-Gaussianity from two-component hybrid inflation
• A generalized local ansatz and its effect on halo bias
• Extended Slow-Roll Conditions and Rapid-Roll Conditions
• On Classification of Models of Large Local-Type Non-Gaussianity
• Isocurvature Constraints on Portal Couplings
• Lectures on inflation and cosmological perturbations
• Non-Gaussianity in Two-Field Inflation
• A Cosmological Higgs Collider
• Hidden Inflaton Dark Matter
• Gravitational Portals with Non-Minimal Couplings
• Inflationary Imprints on Dark Matter
• Spectator Dark Matter
• Theory of non-Gaussianity in warm inflation
• Preheating and the non-gaussianity of the curvature perturbation
• Probing Leptogenesis with the Cosmological Collider
• WIMPs, FIMPs, and Inflaton phenomenology via reheating, CMB and $\Delta N_{eff}$
• Gravity as a Portal to Reheating, Leptogenesis and Dark Matter
• Limits on Isocurvature Perturbations from Non-Gaussianity in WMAP Temperature Anisotropies
• Freeze-in from Preheating
• Modulated Reheating and Large Non-Gaussianity in String Cosmology
• Precise Measurements of Primordial Power Spectrum with 21 cm Fluctuations
• WIMPs during Reheating
• Scalar Dark Matter Production from Preheating and Structure Formation Constraints
• Primordial perturbations and non-Gaussianities from modulated trapping
• Higgs boson induced reheating and ultraviolet frozen-in dark matter
• Non-Gaussianity and Baryonic Isocurvature Fluctuations in the Curvaton Scenario
• From WIMPs to FIMPs with Low Reheating Temperatures
• Towards distinguishing variants of non-minimal inflation
• Non-Gaussianity from the hybrid potential
• Non-Gaussianity from resonant curvaton decay
• Warm Little Inflaton becomes Cold Dark Matter
• Non-Gaussianity of scalar perturbations generated by conformal mechanisms
• Scale-invariant scalar field dark matter through the Higgs portal
• Primordial Non-Gaussianity in Models with Dark Matter Isocurvature Fluctuations
• Reheating and Dark Matter Freeze-in in the Higgs-$R^2$ Inflation Model
• Effect of Background Evolution on the Curvaton Non-Gaussianity
• Confronting Dark Matter Freeze-In during Reheating with Constraints from Inflation
• The next non-Gaussianity frontier: what can a measurement with $\sigma (f_{\mathrm{NL}})\lesssim 1$ tell us about multifield inflation?
• Primordial trispectra and CMB spectral distortions
• Scalar overproduction in standard cosmology and predictivity of non-thermal dark matter
• A Cosmic Microscope for the Preheating Era
• Multi-disformal invariance of nonlinear primordial perturbations
• Scalar field dark matter with spontaneous symmetry breaking and the $3.5$ keV line
• General analytic predictions of two-field inflation and perturbative reheating
• Density Perturbations from Modulated Decay of the Curvaton
• Planck constraints on Higgs modulated reheating of renormalization group improved inflation
• Dark Radiation from Modulated Reheating
• Can Standard Model Higgs Seed the Formation of Structures in Our Universe?
• Oscillating scalar dissipating in a medium
• Density Fluctuations in Thermal Inflation and Non-Gaussianity
• 21 cm Angular Power Spectrum from Minihalos as a Probe of Primordial Spectral Runnings
• Challenges for Inflaton Dark Matter
• Relaxing inflation models with non-minimal coupling: A general study
• Hemispherical Power Asymmetry from Scale-Dependent Modulated Reheating
• Constraining isocurvature perturbations with the 21cm emission from minihaloes
• Primordial curvature perturbation during and at the end of multi-field inflation
• Mixed Inflaton and Spectator Field Models after Planck
• Generic inference of inflation models by non-Gaussianity and primordial power spectrum reconstruction
• Implications of Planck results for models with local type non-Gaussianity
• Probing primordial non-Gaussianity with 21 cm fluctuations from minihalos
• Gravitino Dark Matter and Non-Gaussianity
• Dark matter production and reheating via direct inflaton couplings: collective effects
• Spectator field models in light of spectral index after Planck
• Implications of the Planck bispectrum constraints for the primordial trispectrum
• Statistics of general functions of a Gaussian field -application to non-Gaussianity from preheating-
• Dissipation of oscillating scalar backgrounds in an FLRW universe
• Modulated reheating by curvaton
• Large Density Perturbations from Reheating to Standard Model particles due to the Dynamics of the Higgs Boson during Inflation
• What Planck does not tell us about inflation
• CMB spectral distortions in generic two-field models
• Fully non-linear equivalence of delta N and covariant formalisms
• Non-Gaussianity in rapid-turn multi-field inflation
• Sneutrinos as Mixed Inflaton and Curvaton
• Structure Formation with Two Periods of Inflation: Beyond PLaIn $\Lambda$CDM
• Particle Production during Inflation in Light of PLANCK
• Multi-chaotic inflation with and without spectator field
• Spectator dark matter in non-standard cosmologies
• Constraints on variations in inflaton decay rate from modulated preheating
• Reheating in Chaotic D-Term Inflation
• Rolling in the Modulated Reheating Scenario
• Double inflation via non-minimally coupled spectator
• Affleck-Dine baryogenesis with modulated reheating
• Lecture notes on non-Gaussianity
• Primordial black holes save $R^2$ inflation
• Curvature perturbation from velocity modulation
• Higgs-like spectator field as the origin of structure
• Primordial non-Gaussianity from the Effects of the Standard Model Higgs during Reheating after Inflation
• Escape from the swamp with spectator
• Impact of Dark Sector Preheating on CMB Observables
• Cosmological Signatures of Neutrino Seesaw Mechanism
• Cosmological Non-Gaussianity from Neutrino Seesaw Mechanism
• Supersymmetric $\nu$-Inflaton Dark Matter
• Freeze-in and freeze-out production of Higgs portal Majorana fermionic dark matter during and after reheating
• Leptogenesis via Inflaton Mass Terms in Non-Minimally Coupled Inflation
• Sneutrinos as two inflatons and curvaton and leptogenesis
• Stochastic gravitational wave from graviton bremsstrahlung in inflaton decay into massive spin 3/2 particles
• Mixed Inflaton and Spectator Field Models: CMB constraints and $\mu$ distortion
• Cosmon as the Modulon: Non-Gaussianity from Dark Energy
• Inhomogeneous Reheating Scenario with DBI fields
• On gravitational preheating
• Higher order non-linear parameters with PLANCK
• Decay of a scalar condensate in two different approaches
• Fermion (non)reheating with a quartic inflaton potential
• Probing Bose-enhanced Inflaton Decay with Gravitational Waves
• Reheating and Dark Matter Production