Constraining scale-dependent non-Gaussianity with future large-scale structure and the CMB

2012/06/30 by Adam Becker, Dragan Huterer, Kenji Kadota
Physics and Astronomy · #Anisotropy #Astrophysics #Cosmic background radiation #Cosmic microwave background #Cosmology #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Galaxies: Formation, Evolution, Phenomena #Non-Gaussianity #Physics #Planck #Quantum mechanics #Scale (ratio) #Statistical physics #astro-ph.CO #hep-ph

paper · pdf · doi:10.1088/1475-7516/2012/12/034

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

arxiv created 2012/07/10 · openalex publication_date 2012/12/20 · arxiv updated 2015/06/05 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06

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.

Citations

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• Optimal weighting infNLconstraints from large scale structure in an idealised case
• The shape of non-Gaussianities
• Non-Gaussianity from Inflation: Theory and Observations
• Large-scale structure, the cosmic microwave background and primordial non-Gaussianity
• Non-Gaussian Halo Bias and Future Galaxy Surveys
• Mass function and bias of dark matter halos for non-Gaussian initial conditions
• Observational signatures and non-Gaussianities of general single-field inflation
• Impact of uncertainties in the cosmological parameters on the measurement of primordial non-Gaussianity
• Report of the Dark Energy Task Force
• The Scientific Programme of Planck