CMB-S4 forecast on the primordial non-Gaussianity parameter of feature models

Abstract

We present forecasts on the primordial non-Gaussianity parameter $f_{\text{NL}}$ of feature models for the future Cosmic Microwave Background Stage-4 (CMB-S4) experiments. The Fisher matrix of the bispectrum estimator was computed using noise covariances expected for preliminary CMB-S4 specifications including ones for the Simons Observatory. We introduce a novel method that improves the computation by orthonormalising the covariance matrix. The most sensitive CMB-S4 experiment with 1' beam and 1$\mu K$-arcmin noise would yield a factor of 1.7-2.2 times more stringent constraints compared to Planck. Under the Simons Observatory baseline conditions the improvement would be about 1.3-1.6 times to Planck. We also thoroughly studied the effects of various model and experimental parameters on the forecast. Detailed analysis on the constraints coming from temperature and E-mode polarisation, in particular, provided some insight into detecting oscillatory features in the CMB bispectrum.

References in corpus (37)

• Efficient Computation of CMB anisotropies in closed FRW models
• Non-Gaussian features of primordial fluctuations in single field inflationary models
• The Simons Observatory: Science goals and forecasts
• Primordial Non-Gaussianities from Inflation Models
• Planck 2015 results. XVII. Constraints on primordial non-Gaussianity
• Features of heavy physics in the CMB power spectrum
• Inflationary perturbations from a potential with a step
• Large Non-Gaussianities in Single Field Inflation
• Measuring primordial non-Gaussianity in the cosmic microwave background
• Hunting for Primordial Non-Gaussianity in the Cosmic Microwave Background
• Features and New Physical Scales in Primordial Observables: Theory and Observation
• Signatures of Initial State Modifications on Bispectrum Statistics
• Primordial non-Gaussianity and Bispectrum Measurements in the Cosmic Microwave Background and Large-Scale Structure
• Superimposed Oscillations in the WMAP Data?
• Non-Gaussianity from Step Features in the Inflationary Potential
• Algorithms for bispectra: forecasting, optimal analysis, and simulation
• Fast Estimator of Primordial Non-Gaussianity from Temperature and Polarization Anisotropies in the Cosmic Microwave Background
• The CMB Bispectrum
• Generalized Slow Roll for Large Power Spectrum Features
• Searching for Oscillations in the Primordial Power Spectrum: Constraints from Planck (Paper II)
• Probing primordial features with future galaxy surveys
• Wiggly Whipped Inflation
• Whipped inflation
• The Future of Primordial Features with Large-Scale Structure Surveys
• Warp Features in DBI Inflation
• The Effective Field Theory of Inflation Models with Sharp Features
• Correlation Functions of CMB Anisotropy and Polarization
• Combining power spectrum and bispectrum measurements to detect oscillatory features
• Searching for Oscillations in the Primordial Power Spectrum: Perturbative Approach (Paper I)
• Polyspectra searches for sharp oscillatory features in cosmic microwave sky data
• WMAP 7 Constraints on Oscillations in the Primordial Power Spectrum
• Searching for primordial localized features with CMB and LSS spectra
• Features in the primordial spectrum: new constraints from WMAP7+ACT data and prospects for Planck
• Efficient optimal non-Gaussian CMB estimators with polarisation
• Bayesian analysis of inflationary features in Planck and SDSS data
• The Komatsu Spergel Wandelt estimator for oscillations in the cosmic microwave background bispectrum
• Large Scale Structure Forecast Constraints on Particle Production During Inflation

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• Primordial Features from Linear to Nonlinear Scales
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• High-resolution CMB bispectrum estimator with flexible modal basis
• CMB Shadows: The Effect of Interstellar Extinction on Cosmic Microwave Background Polarization and Temperature Anisotropy
• Suppression of scalar power on large scales and associated bispectra