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arXiv · 1303.4387

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

Sirichai Chongchitnan
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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.

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Sirichai Chongchitnan. 2013-03-18. The 21cm Power Spectrum and the Shapes of Non-Gaussianity. https://doi.org/10.1088/1475-7516%2F2013%2F03%2F037

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