Inhomogeneous non-Gaussianity

Abstract

We propose a method to probe higher-order correlators of the primordial density field through the inhomogeneity of local non-Gaussian parameters, such as f_NL, measured within smaller patches of the sky. Correlators between n-point functions measured in one patch of the sky and k-point functions measured in another patch depend upon the (n+k)-point functions over the entire sky. The inhomogeneity of non-Gaussian parameters may be a feasible way to detect or constrain higher-order correlators in local models of non-Gaussianity, as well as to distinguish between single and multiple-source scenarios for generating the primordial density perturbation, and more generally to probe the details of inflationary physics.

16 pages, 2 figures; v2: Minor changes and references added. Matches the published version

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Cited by in corpus (23)

• Cosmology and Fundamental Physics with the Euclid Satellite
• On Soft Limits of Inflationary Correlation Functions
• Inflation Physics from the Cosmic Microwave Background and Large Scale Structure
• Primordial black holes as a tool for constraining non-Gaussianity
• Operator Product Expansion of Inflationary Correlators and Conformal Symmetry of de Sitter
• Stochastic Bias from Non-Gaussian Initial Conditions
• Hemispherical Asymmetry and Local non-Gaussianity: a Consistency Condition
• Asymmetric Sky from the Long Mode Modulations
• The long-short wavelength mode coupling tightens primordial black hole constraints
• A non-Gaussian landscape
• Statistical Naturalness and non-Gaussianity in a Finite Universe
• Constraints on Gauge Field Production during Inflation
• Modulated curvaton decay
• Large trispectrum in two-field slow-roll inflation
• Primordial non-Gaussianity in the bispectra of large-scale structure
• Scale-dependent non-Gaussianity and the CMB Power Asymmetry
• Non-Gaussian Mode Coupling and the Statistical Cosmological Principle
• Loop corrections and a new test of inflation
• Generating the cosmic microwave background power asymmetry with $g_{NL}$
• CMB hemispherical asymmetry from non-linear isocurvature perturbations
• Implications of the Planck bispectrum constraints for the primordial trispectrum
• Non-Gaussian bubbles in the sky
• Smoluchowski Coagulation Equation and the Evolution of Primordial Black Hole Clusters