The 21cm Power Spectrum and the Shapes of Non-Gaussianity

TL;DR

This paper explores how 21cm radiation measurements during reionization can constrain primordial non-Gaussianity shapes, potentially revealing complex inflation physics with upcoming radio arrays like SKA.

Contribution

It quantifies the impact of different non-Gaussianity shapes on the 21cm power spectrum and assesses SKA's potential to constrain these parameters.

Findings

Constraints on f_NL can reach order 1 with future radio arrays.

21cm measurements can provide constraints comparable to CMB experiments.

Different non-Gaussianity shapes affect the 21cm power spectrum distinctly.

Abstract

We consider how measurements of the 21cm radiation from the epoch of reionization (z=8-12) can constrain the amplitudes of various `shapes' of primordial non-Gaussianity. The limits on these shapes, each parametrized by the non-linear parameter, f_NL, can reveal whether the physics of inflation is more complex than the standard single-field, slow-roll scenario. In this work, we quantify the effects of the well-known local, equilateral, orthogonal and folded types of non-Gaussianities on the 21cm power spectrum, which is expected to be measured by upcoming radio arrays such as the Square-Kilometre Array (SKA). We also assess the prospects of the SKA in constraining these non-Gaussianities, and found constraints that are comparable with those expected from cosmic-microwave-background experiments such as Planck. We show that the limits on various f_NL can be tightened to O(1) using a radio array with a futuristic but realistic set of specifications.