CMB constraints on running non-Gaussianity

Abstract

We develop a complete set of tools for CMB forecasting, simulation and estimation of primordial running bispectra, arising from a variety of curvaton and single-field (DBI) models of Inflation. We validate our pipeline using mock CMB running non-Gaussianity realizations and test it on real data by obtaining experimental constraints on the $f_{\mathrm{NL}}$ running spectral index, $n_{\mathrm{NG}}$, using WMAP 9-year data. Our final bounds (68\% C.L.) read $-0.6<n_{\mathrm{NG}}<1.4$, $-0.3<n_{\mathrm{NG}}<1.2$, $-1.1<n_{\mathrm{NG}}<0.7$ for the single-field curvaton, two-field curvaton and DBI scenarios, respectively. We show forecasts and discuss potential improvements on these bounds, using {\it Planck} and future CMB surveys.

20 pages, 8 figures, 3 table

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Cited by in corpus (16)

• Gravitational Wave Anisotropies from Primordial Black Holes
• Constraining primordial non-Gaussianity using two galaxy surveys and CMB lensing
• Capturing Non-Gaussianity of the Large-Scale Structure with Weighted Skew-Spectra
• Quantifying the Redshift Space Distortion of the Bispectrum I: Primordial Non-Gaussianity
• Quantifying the Redshift Space Distortion of the Bispectrum II: Induced Non-Gaussianity at Second Order Perturbation
• A fast estimator for quantifying the shape dependence of the 3D bispectrum
• New Horizons in Cosmology with Spectral Distortions of the Cosmic Microwave Background
• Quantifying the redshift space distortion of the bispectrum III : Detection prospects of the multipole moments
• Cosmic Degeneracies III: N-body Simulations of Interacting Dark Energy with Non-Gaussian Initial Conditions
• Constraints on Running of Non-Gaussianity from Large Scale Structure Probes
• Non-Gaussianities in generalized non-local $R^2$-like inflation
• Brisk estimator for the angular multipoles of the redshift space bispectrum
• The size and shape dependence of the SDSS galaxy bispectrum
• Generalized local ansatz for scale-dependent primordial non-Gaussianities and future galaxy surveys
• Probing the Running of Primordial Bispectrum and Trispectrum using CMB Spectral Distortions
• Towards detecting Primordial non-Gaussianity in the CMB using Spherical Convolutional Neural Networks