Constraining Scale-Dependent Non-Gaussianity with Future Large-Scale Structure and the CMB

Abstract

We forecast combined future constraints from the cosmic microwave background and large-scale structure on the models of primordial non-Gaussianity. We study the generalized local model of non-Gaussianity, where the parameter f_NL is promoted to a function of scale, and present the principal component analysis applicable to an arbitrary form of f_NL(k). We emphasize the complementarity between the CMB and LSS by using Planck, DES and BigBOSS surveys as examples, forecast constraints on the power-law f_NL(k) model, and introduce the figure of merit for measurements of scale-dependent non-Gaussianity.

28 pages, 8 figures, 2 tables; v2: references updated

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Cited by in corpus (19)

• Planck 2018 results. IX. Constraints on primordial non-Gaussianity
• Constraints on primordial non-Gaussianity from 800,000 photometric quasars
• Building a Boostless Bootstrap for the Bispectrum
• High-redshift JWST Observations and Primordial Non-Gaussianity
• Testing the Running of non-Gaussianity through the CMB mu-distortion and the Halo Bias
• The Hunt for Primordial Interactions in the Large Scale Structures of the Universe
• Hunting high and low: Disentangling primordial and late-time non-Gaussianity with cosmic densities in spheres
• Constraining the initial conditions of the Universe using large scale structure
• Optimising primordial non-Gaussianity measurements from galaxy surveys
• General formula for the running of local fNL
• Forecasting Chemical Abundance Precision for Extragalactic Stellar Archaeology
• Scale-dependent bias from multiple-field inflation
• Non-Gaussian Shape Recognition
• Non-Gaussian Shape Discrimination with Spectroscopic Galaxy Surveys
• Anisotropic non-gaussianity with noncommutative spacetime
• Constraints on Running of Non-Gaussianity from Large Scale Structure Probes
• Scale-dependent bias due to primordial vector fields
• Indirect dark matter searches at ultrahigh energy neutrino detectors
• Generalized local ansatz for scale-dependent primordial non-Gaussianities and future galaxy surveys