Nongaussian Isocurvature Perturbations from Inflation

Abstract

We present a class of very simple inflationary models of two scalar fields which leads to nongaussian isothermal perturbations with "blue" spectrum, n > 1. One of the models is inspired by supersymmetric theories where light scalar fields naturally acquire masses of the order of the Hubble constant H during inflation. Another model presumes that one of the fields has a nonminimal interaction with gravity. By a slight modification of parameters of these models one can obtain either gaussian isothermal perturbations, or nongaussian adiabatic perturbations with n > 1.

Few misprints are corrected; results are not changed. It is noted that our results for the most natural range of parameters correspond to the spectral index of isothermal perturbations n ~1.6

References in corpus (2)

• Preheating, Supersymmetry Breaking and Baryogenesis
• Observational Constraints on Open Inflation Models

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• Effects of Light Fields During Inflation
• Searching for blue in the dark
• The probability distribution for non-Gaussianity estimators constructed from the CMB trispectrum
• Statistics of general functions of a Gaussian field -application to non-Gaussianity from preheating-
• Chaotic inflation in supergravity and cosmic string production
• Probing a panoply of curvaton-decay scenarios using CMB data
• Remote Inflation: Hybrid-like inflation without hybrid-type potential
• Robust Neural Network-Enhanced Estimation of Local Primordial Non-Gaussianity
• BAO Modulation as a Probe of Compensated Isocurvature Perturbations
• Entropy Fluctuations in Brane Inflation Models
• "Phantom" Inflation in Warped Compactification
• Curvatons in Warped Throats
• Running spectral index from shooting-star moduli
• Mixed inflaton and curvaton scenario with sneutrinos
• Inflaton or Curvaton? Constraints on Bimodal Primordial Spectra from Mixed Perturbations
• Uncorrelated Compensated Isocurvature Perturbations from kSZ Tomography
• Cosmological constraints on the curvaton web parameters
• Identifying the inflaton with primordial gravitational waves
• Super cosmic variance from mode-coupling: A worked example
• Wigner-Eckart theorem in cosmology: Bispectra for total-angular-momentum waves
• A Bump in the Blue Axion Isocurvature Spectrum
• Bayesian evidence of the post-Planck curvaton
• Exploring Two-Field Inflation in the Wess-Zumino Model
• Curvaton and the inhomogeneous end of inflation
• What Planck does not tell us about inflation
• Quadratic Isocurvature Cross-Correlation, Ward Identity, and Dark Matter
• Multiple spectator condensates from inflation
• Evolution of curvature perturbation in generalized gravity theories
• Stochastic inflation and primordial black holes
• Non-Gaussianity with Lagrange Multiplier Field in the Curvaton Scenario
• Impact of the 1/f noise and the asymmetric beam on non-Gaussianity searches with Planck
• Modulated reheating by curvaton
• Heavy Particles from Inflation
• Non-Gaussianity from false vacuum inflation: Old curvaton scenario
• Adiabatic versus Isocurvature Non--Gaussianity
• Higgs Boson in RG running Inflationary Cosmology
• Non-Gaussianity and gravitational wave background in curvaton with a double well potential
• Constraints on primordial non-Gaussianity from WMAP7 and Luminous Red Galaxies power spectrum and forecast for future surveys
• Second-order stochastic theory for self-interacting scalar fields in de Sitter spacetime
• Electrically charged curvaton
• Computing First-Passage Times with the Functional Renormalisation Group
• Effect of component separation on the temperature distribution of the CMB
• Scale-dependent CMB power asymmetry from primordial speed of sound and a generalized $\delta$N formalism
• Cosmological Moduli Problem from Thermal Effects
• Remote Inflation as hybrid-like sneutrino/MSSM inflation
• Note on the Robustness of the Neutrino Mass Bounds from Cosmology
• Radiative Corrections from Heavy Fast-Roll Fields during Inflation
• Dynamics of Cosmological Perturbations in Multi-Speed Inflation
• Curvaton Decay into Baryons, anti-Baryons and Radiation
• Large Tensor-to-Scalar Ratio in Small-Field Inflation
• Minimal solution to the axion isocurvature problem from a nonminimal coupling
• Fully non-linear equivalence of delta N and covariant formalisms
• Quintessential Isocurvature in Separate Universe Simulations
• Effect of intermediate Minkowskian evolution on CMB bispectrum
• Eternal Universes
• Towards conformal cosmology
• Suppressed Non-Gaussianity in the Curvaton Model
• A falsely fat curvaton with an observable running of the spectral tilt
• The Origin of the Large-Scale Structure in the Universe: Theoretical and Statistical Aspects
• Impact of freeze-in on dark matter isocurvature
• Primordial non-Gaussianity as a probe of seesaw and leptogenesis
• Curvaton Potential Terms, Scale-Dependent Perturbation Spectra and Chaotic Initial Conditions
• Improving Constraints on Inflation with CMB Delensing
• Statistical nature of non-Gaussianity from cubic order primordial perturbations: CMB map simulations and genus statistic
• Hubble induced mass after inflation in spectator field models
• Spontaneous Baryogenesis without Baryon Isocurvature
• Conformal Universe as false vacuum decay
• Statistics of the excursion sets in models with local primordial non-Gaussianity
• Axionlike Origin of the Primordial Density Perturbation
• Nambu-Goldstone Affleck-Dine Baryogenesis
• A forecast for the detection of the power asymmetry from galaxy surveys
• Search for non-Gaussianities in the WMAP data with the Scaling Index Method
• Curvaton preheating revisited
• Curvature Perturbation and Domain Wall Formation with Pseudo Scaling Scalar Dynamics
• Curvaton scenarios with inflaton decays into curvatons
• Correlated curvature perturbations and magnetogenesis from the GUT gauge bosons
• Removing Interlopers From Intensity Mapping Probes Of Primordial Non-Gaussianity
• Flat-sky Angular Power Spectra Revisited
• Generically large nongaussianity in small multifield inflation
• Curvaton as dark matter with secondary inflation
• Non-perturbative $\delta N$
• Resolving primordial physics through correlated signatures
• Curvatons and inhomogeneous scenarios with deviation from slow-roll
• Generation of perturbation after multi-field inflation
• A new perspective on supersymmetric inflation
• Radiative corrections to scalar masses in de Sitter space
• Limits on Semiclassical Fluctuations in the Primordial Universe
• Large Scale Cosmic Perturbation from Evaporation of Primordial Black Holes
• Using CMB polarization to constrain the anomalous nature of the Cold Spot with an incomplete sky-coverage
• The dependence of cosmological parameters estimated from the microwave background on non-gaussianity
• Density perturbations from both the inflaton and the curvaton
• Isocurvature initial conditions for second order Boltzmann solvers
• Candidates for Inflaton in Quiver Gauge Theory
• Higher moments of primordial non-Gaussianity and N-body simulations
• Testing Inflation: A Bootstrap Approach
• The Effect of Curvaton Decay on the Primordial Power Spectrum
• Magnetic Fields from Compensated Isocurvature Perturbations
• Aspects of warm-flat directions
• Lensing Bias to CMB Polarization Measurements of Compensated Isocurvature Perturbations
• Non-Gaussian assembly bias from a semi-analytic galaxy formation model
• Lecture notes on non-Gaussianity
• Dynamical vs spectator models of (pseudo-)conformal Universe
• Entropy production and curvature perturbation from dissipative curvatons
• Particle physics model of curvaton inflation in a stable universe
• Primordial Non-Gaussianity from LAMOST Surveys
• Curvature perturbation from velocity modulation
• A model of cosmology and particle physics at an intermediate scale
• Primordial black holes from the ultraslow-roll phase in the inflaton--curvaton mixed field inflation
• The R-axion and non-Gaussianity
• Higgs-like spectator field as the origin of structure
• Evolution of Power Spectrum in Non-Gaussian Models
• On Primordial Perturbations of Test Scalar Fields
• Supersymmetric hybrid inflation with a light scalar
• Non-gaussianity and Statistical Anisotropy in Cosmological Inflationary Models
• Primordial black holes from a curvaton: the role of bimodal distributions
• CMB lensing forecasts for constraining the primordial perturbations: adding to the CMB temperature and polarization information
• Constrained Superfields in Dynamical Background
• The quantum origin of cosmic structure: theory and observations
• Curvaton mechanism after multi-field inflation
• Nonlinear Perturbations in a Variable Speed of Light Cosmology
• CMB Polarization by the Asymmetric Template of Scalar Perturbations
• Enlarging the Space of Viable Inflation Models: A Slingshot Mechanism
• The Quantum Phase of Inflation
• Right-Handed Sneutrino Curvaton and non-Gaussianity
• Primordial Black Holes in non-linear perturbation theory
• Curvaton: Perturbations and reheating
• Flat Direction Dynamics in a Non-Topological Soliton-Dominated Universe
• Constraining primordial non-Gaussianity using Neural Networks
• Pseudo-conformal Universe: late-time contraction and generation of tensor modes
• Planck isocurvature constraint on primordial black holes lighter than a kiloton
• Non-linear effects in early Universe cosmology
• Inflationary cross-correlations of a non-minimal spectator and their soft limits
• Gravity of Cosmological Perturbations in the CMB
• Non-Gaussianity after many-field reheating
• Non-Adiabatic Perturbations from Single-Field Inflation
• Mori-Zwanzig formalism for early cosmic inflation
• On the space of non-Gaussian fields with single-clock bispectra
• Searching for dark matter isocurvature initial conditions with N-body Simulations
• Sojourn functionals for spatiotemporal random fields with long-memory
• Probing small-scale baryon and dark matter isocurvature perturbations with cosmic microwave background anisotropies
• An Analytic Treatment of Underdamped Axionic Blue Isocurvature Perturbations
• Cosmic voids and BAO with relative baryon-CDM perturbations
• Unified Origin of Curvature Perturbation and Baryon Asymmetry of the Universe
• Dynamically generated tilt of isocurvature fluctuations
• Probing CMB Polarization Gaussianity with the Statistics of Unpolarized Points: Non-Gaussianity of Planck Data and Prospects for Future B-Mode Measurements
• Testing Inflationary Cosmology