Primordial Non-Gaussianity Estimation using 21 cm Tomography from the Epoch of Reionization

Abstract

Measuring the small primordial nonGaussianity (PNG) predicted by cosmic inflation theories may help diagnose them. The detectability of PNG by its imprint on the 21cm power spectrum from the epoch of reionization is reassessed here in terms of $f_{NL}$, the local nonlinearity parameter. We find that an optimum, multi-frequency observation by SKA can achieve $\Delta f_{NL}\sim 3$ (comparable to recent Planck CMB limits), while a cosmic-variance-limited array of this size like Omniscope can even detect $\Delta f_{NL}\sim 0.2$. This substantially revises the methods and results of previous work.

Accepted by PRD with minor changes. References added and updated

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Cited by in corpus (21)

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• Inflation and Early Dark Energy with a Stage II Hydrogen Intensity Mapping Experiment
• The Hunt for Primordial Interactions in the Large Scale Structures of the Universe
• The observable 21cm signal from reionization may be perturbative
• Nonlinear Bias of Cosmological Halo Formation in the Early Universe
• On the Trispectrum of Galileon Inflation
• Probing the primordial Universe with 21-cm line from cosmic dawn/epoch of reionization
• Power Spectrum and Non-Gaussianities in Anisotropic Inflation
• Estimation of HII Bubble Size Distribution from 21cm Power Spectrum with Artificial Neural Networks
• Testing the scale-dependent hemispherical asymmetry with the 21-cm power spectrum from the epoch of reionization
• Detecting the integrated Sachs-Wolfe effect with high-redshift 21-cm surveys
• The gravitational and lensing-ISW bispectrum of 21cm radiation
• Next-to-leading order QCD corrections to $HZ{W}^{\pm }$ production at 14 TeV LHC
• Gluon fusion and $b\bar{b}$ corrections to $H{W}^{+}{W}^{-}/HZZ$ production in the POWHEG-BOX
• The Linear Perturbation Theory of Reionization in Position-Space: Cosmological Radiative Transfer Along the Light-Cone
• Reaching small scales with low frequency imaging: applications to the Dark Ages
• 21-cm power spectrum and ionization bias as a probe of long-mode modulated non Gaussian sky
• Nonlinear reconstruction of 21cm global signal from 21cm power spectrum with artificial neural networks