Non-Gaussianity from isocurvature perturbations

Abstract

We develop a formalism to study non-Gaussianity in both curvature and isocurvature perturbations. It is shown that non-Gaussianity in the isocurvature perturbation between dark matter and photons leaves distinct signatures in the CMB temperature fluctuations, which may be confirmed in future experiments, or possibly, even in the currently available observational data. As an explicit example, we consider the QCD axion and show that it can actually induce sizable non-Gaussianity for the inflationary scale, H_{inf} = O(10^9 - 10^{11})GeV.

24 pages, 6 figures; references added; version to appear in JCAP

References in corpus (7)

• A numerical study of non-gaussianity in the curvaton scenario
• Isocurvature bounds on axions revisited
• Constraining Isocurvature Initial Conditions with WMAP 3-year data
• The curvature perturbation in a box
• Non-gaussianity and cosmic uncertainty in curvaton-type models
• Hints of Isocurvature Perturbations in the Cosmic Microwave Background?
• Non-Gaussianity from Symmetry

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• Calculating Non-adiabatic Pressure Perturbations during Multi-field Inflation
• Primordial Non-Gaussianities from the Trispectra in Multiple Field Inflationary Models
• Gravitational Wave Background and Non-Gaussianity as a Probe of the Curvaton Scenario
• On the Issue of the ζSeries Convergence and Loop Corrections in the Generation of Observable Primordial Non-Gaussianity in Slow-Roll Inflation. Part II: the Trispectrum
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• String theoretic QCD axions in the light of PLANCK and BICEP2
• Limits on Second-Order Non-Gaussianity from Minkowski Functionals of WMAP Data
• CMB constraint on non-Gaussianity in isocurvature perturbations
• Chaotic Inflation with Right-handed Sneutrinos after Planck
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• Primordial Non-Gaussianity in Models with Dark Matter Isocurvature Fluctuations
• Trispectrum from Ghost Inflation
• On Non-Gaussianities in Multi-Field Inflation (N fields): Bi- and Tri-spectra beyond Slow-Roll
• Non-Gaussianity from Isocurvature Perturbations : Analysis of Trispectrum
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• Higgs inflation and suppression of axion isocurvature perturbation
• Optimal constraint on g_NL from CMB
• Non-Gaussianities of Single Field Inflation with Non-minimal Coupling
• Hidden axion dark matter decaying through mixing with QCD axion and the 3.5 keV X-ray line
• Peccei-Quinn extended gauge-mediation model with vector-like matter
• Axion Models with High Scale Inflation
• Anomaly mediation deformed by axion
• Isocurvature Perturbations and Non-Gaussianity of Gravitationally Produced Nonthermal Dark Matter
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