Primordial non-Gaussianity estimation using 21 cm tomography from the epoch of reionization

Measuring the small primordial non-Gaussianity (PNG) predicted by cosmic inflation theories may help diagnose them. The detectability of PNG by its imprint on the 21 cm power spectrum from the epoch of reionization is reassessed here in terms of [functionof] sub(NL), the local nonlinearity parameter...

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Bibliographic Details
Published in:Physical review. D, Particles, fields, gravitation, and cosmology Particles, fields, gravitation, and cosmology, 2013-10, Vol.88 (8), Article 081303
Main Authors: Mao, Yi, D’Aloisio, Anson, Zhang, Jun, Shapiro, Paul R.
Format: Article
Language:English
Subjects:
Arrays
Cosmology
Gravitation
Inflation
Nonlinearity
Optimization
Tomography
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Summary:Measuring the small primordial non-Gaussianity (PNG) predicted by cosmic inflation theories may help diagnose them. The detectability of PNG by its imprint on the 21 cm power spectrum from the epoch of reionization is reassessed here in terms of [functionof] sub(NL), the local nonlinearity parameter. We find that an optimum, multifrequency observation by SKA can achieve Delta [functionof] sub(NL) ~ 3 (comparable to recent Planck CMB limits), while a cosmic-variance-limited array of this size like Omniscope can even detect Delta [functionof] sub(NL) ~ 0.2. This substantially revises the methods and results of previous
ISSN:1550-7998
1550-2368
DOI:10.1103/PhysRevD.88.081303