Isocurvature modes in the CMB bispectrum

Abstract

We study the angular bispectrum of local type arising from the (possibly correlated) combination of a primordial adiabatic mode with an isocurvature one. Generically, this bispectrum can be decomposed into six elementary bispectra. We estimate how precisely CMB data, including polarization, can enable us to measure or constrain the six corresponding amplitudes, considering separately the four types of isocurvature modes (CDM, baryon, neutrino density, neutrino velocity). Finally, we discuss how the model-independent constraints on the bispectrum can be combined to get constraints on the parameters of multiple-field inflation models.

29 pages, 19 figures. v2: minor textual changes, matches published version

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Cited by in corpus (29)

• Planck 2015 results. XVII. Constraints on primordial non-Gaussianity
• Axions : Theory and Cosmological Role
• The First Three Seconds: a Review of Possible Expansion Histories of the Early Universe
• Planck 2018 results. IX. Constraints on primordial non-Gaussianity
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• Primordial non-Gaussianities after Planck 2015: an introductory review
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• Modulated curvaton decay
• Density Perturbations from Modulated Decay of the Curvaton
• Constraints on neutrino density and velocity isocurvature modes from WMAP-9 data
• Anisotropic CMB distortions from non-Gaussian isocurvature perturbations
• Entropy Production in Affine Inflation
• Non-Gaussian Shape Recognition
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• Intrinsic Entropy Perturbations from the Dark Sector
• Non-Gaussian Shape Discrimination with Spectroscopic Galaxy Surveys
• Spectator dark matter in non-standard cosmologies
• Non-Gaussianities from isocurvature modes
• Refined Study of Isocurvature Fluctuations in the Curvaton Scenario
• Isocurvature modes and non-Gaussianity in affine inflation
• Isocurvature modes: joint analysis of the CMB power spectrum and bispectrum
• Isocurvature initial conditions for second order Boltzmann solvers
• Dynamical aspects of asymmetric Eddington gravity with scalar fields
• Smooth hybrid inflation in a supersymmetric axion model
• QCD Axions and CMB Anisotropy
• Non-linear effects in early Universe cosmology
• Probing Dark Matter Isocurvature with Primordial Non-Gaussianity
• Non-Gaussianity from explicit $U(1)$-breaking interactions
• Non-Gaussianity in Cosmology: from Inflation to the CMB