Impact of Secondary non-Gaussianities on the Search for Primordial Non-Gaussianity with CMB Maps

Abstract

When constraining the primordial non-Gaussianity parameter f_NL with cosmic microwave background anisotropy maps, the bias resulting from the covariance between primordial non-Gaussianity and secondary non-Gaussianities to the estimator of f_NL is generally assumed to be negligible. We show that this assumption may not hold when attempting to measure the primordial non-Gaussianity out to angular scales below a few tens arcminutes with an experiment like Planck, especially if the primordial non-Gaussianity parameter is around the minimum detectability level with f_NL between 5 and 10. In future, it will be necessary to jointly estimate the combined primordial and secondary contributions to the CMB bispectrum and establish f_NL by properly accounting for the confusion from secondary non-Gaussianities.

arXiv comment4 pages; submitted as a PRD Brief Report

References in corpus (22)

• Wilkinson Microwave Anisotropy Probe (WMAP) Three Year Results: Implications for Cosmology
• Non-Gaussian features of primordial fluctuations in single field inflationary models
• Halo Models of Large Scale Structure
• A Line of Sight Approach to Cosmic Microwave Background Anisotropies
• Acoustic Signatures in the Primary Microwave Background Bispectrum
• First Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Tests of Gaussianity
• Second-Order Cosmological Perturbations from Inflation
• The shape of non-Gaussianities
• Limits on non-Gaussianities from WMAP data
• Measuring primordial non-Gaussianity in the cosmic microwave background
• Detection of primordial non-Gaussianity (fNL) in the WMAP 3-year data at above 99.5% confidence
• The Angular Dependence of the Three-Point Correlation Function of the Cosmic Microwave Background Radiation as Predicted by Inflationary Cosmologies
• The Microwave Background Bispectrum, Paper II: A Probe of the Low Redshift Universe
• Non-Gaussianities in New Ekpyrotic Cosmology
• Non-Gaussian Density Fluctuations from Entropically Generated Curvature Perturbations in Ekpyrotic Models
• Imprint of Reionization on the Cosmic Microwave Background Bispectrum
• Higher-Order Gravitational Perturbations of the Cosmic Microwave Background
• Gauge-Invariant Temperature Anisotropies and Primordial Non-Gaussianity
• Non-linear Integrated Sachs-Wolfe Effect
• Non-Gaussian Aspects of Thermal and Kinetic Sunyaev-Zel'dovich Effects
• Large Scale Pressure Fluctuations and Sunyaev-Zel'dovich Effect
• Sunyaev-Zeldovich Fluctuations from the First Stars?

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• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
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• Hunting for Primordial Non-Gaussianity in the Cosmic Microwave Background
• Signatures of Initial State Modifications on Bispectrum Statistics
• Primordial non-gaussianity, statistics of collapsed objects, and the Integrated Sachs-Wolfe effect
• Primordial non-Gaussianity and Bispectrum Measurements in the Cosmic Microwave Background and Large-Scale Structure
• The shape of the CMB lensing bispectrum
• Planck 2015 results. XXI. The integrated Sachs-Wolfe effect
• Planck 2013 results. XIX. The integrated Sachs-Wolfe effect
• Scale-dependent bias of galaxies and mu-type distortion of the cosmic microwave background spectrum from single-field inflation with a modified initial state
• Weak lensing of the CMB
• Signature of Primordial Non-Gaussianity on Matter Power Spectrum
• Primordial Non-Gaussianity in the Cosmic Microwave Background
• A New Approach to Probing Primordial Non-Gaussianity
• The radiative transfer at second order: a full treatment of the Boltzmann equation with polarization
• CMB lensing and primordial non-Gaussianity
• Non Gaussianity and Minkowski Functionals: forecasts for Planck
• Non-Gaussianity and the Cosmic Microwave Background Anisotropies
• The intrinsic bispectrum of the Cosmic Microwave Background [PhD thesis]
• Non-Gaussianity in the Cosmic Microwave Background Anisotropies at Recombination in the Squeezed limit
• Non-Gaussianity and the CMB Bispectrum: confusion between Primordial and Lensing-Rees Sciama contribution?
• The full squeezed CMB bispectrum from inflation
• Constraints on Primordial Non-Gaussianity from a Needlet Analysis of the WMAP-5 Data
• Non-Gaussianity from Large-Scale Structure Surveys
• Integrated Sachs Wolfe Effect and Rees Sciama Effect
• Lensing reconstruction from PLANCK sky maps: inhomogeneous noise
• Foreground Biases on Primordial Non-Gaussianity Measurements from the CMB Temperature Bispectrum: Implications for Planck and Beyond
• On the non-Gaussianity from Recombination
• Characterisation of the non-Gaussianity of radio and IR point-sources at CMB frequencies
• Self-Calibrated Cluster Counts as a Probe of Primordial Non-Gaussianity
• Point Source Contamination in CMB Non-Gaussianity Analyses
• Isotropy analyses of the Planck convergence map
• CMB lensing and primordial squeezed non-Gaussianity
• Secondary non-Gaussianity and Cross-Correlation Analysis
• Local analyses of Planck maps with Minkowski Functionals
• A Measurement of Primordial Non-Gaussianity Using WMAP 5-Year Temperature Skewness Power Spectrum
• Parametrised modified gravity and the CMB Bispectrum
• The Cold Spot as a Large Void: Rees-Sciama effect on CMB Power Spectrum and Bispectrum
• Weak Lensing of the Primary CMB Bispectrum
• Impact of Uncertainties in the Cosmological Parameters on the Measurement of Primordial non-Gaussianity
• Forecasts on the contamination induced by unresolved point sources in primordial non-Gaussianity beyond Planck
• The Cold Spot as a Large Void: Lensing Effect on CMB Two and Three Point Correlation Functions
• Removing the ISW-lensing bias from the local-form primordial non-Gaussianity estimation
• Cosmic Microwave Background Bispectrum from the Lensing--Rees-Sciama Correlation Reexamined: Effects of Non-linear Matter Clustering
• Non-Gaussianity of diffuse Galactic synchrotron emission at 408 MHz
• Biases to primordial non-Gaussianity measurements from CMB secondary anisotropies
• On non-linear CMB temperature anisotropy from gravitational perturbations
• Estimates of unresolved point sources contribution to WMAP 5
• Primordial non-Gaussianity estimator: the inhomogeneous noise effect