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 (7)

• The Simons Observatory: Science goals and forecasts
• Primordial Non-Gaussianities from Inflation Models
• Fast Estimator of Primordial Non-Gaussianity from Temperature and Polarization Anisotropies in the Cosmic Microwave Background
• Wiggly Whipped Inflation
• Whipped inflation
• Combining power spectrum and bispectrum measurements to detect oscillatory features
• Large Scale Structure Forecast Constraints on Particle Production During Inflation

Cited by in corpus (5)

• Primordial Features from Linear to Nonlinear Scales
• Scratches from the Past: Inflationary Archaeology through Features in the Power Spectrum of Primordial Fluctuations
• 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