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

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.

16 pages. Accepted for publication in JCAP

References in corpus (15)

• The imprints of primordial non-gaussianities on large-scale structure: scale dependent bias and abundance of virialized objects
• Primordial Non-Gaussianities from Inflation Models
• How accurately can 21 cm tomography constrain cosmology?
• Foreground simulations for the LOFAR - Epoch of Reionization Experiment
• Scale-dependent non-Gaussianity probes inflationary physics
• An Improved Method for 21cm Foreground Removal
• Characterizing Foreground for redshifted 21-cm radiation: 150 MHz GMRT observations
• 21-cm Background Anisotropies Can Discern Primordial Non-Gaussianity
• Non-parametric foreground subtraction for 21cm epoch of reionization experiments
• The bispectrum of redshifted 21-cm fluctuations from the dark ages
• An improved model for the formation times of dark matter haloes
• Deriving an Accurate Formula of Scale-dependent Bias with Primordial Non-Gaussianity: An Application of the Integrated Perturbation Theory
• First constraints on the running of non-Gaussianity
• A Study of High-Order Non-Gaussianity with Applications to Massive Clusters and Large Voids
• Non-Gaussianity and Excursion Set Theory: Halo Bias

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