Full-sky bispectrum in redshift space for 21cm intensity maps
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Date
2020
Journal Title
Journal ISSN
Volume Title
Publisher
IOP Publishing
Abstract
We compute the tree-level bispectrum of 21cm intensity mapping after reionisation. We work in directly observable angular and redshift space, focusing on equal-redshift
correlations and thin redshift bins, for which the lensing contribution is negligible. We
demonstrate the importance of the contributions from redshift-space distortions which typically dominate the result. Taking into account the effects of telescope beams and foreground
cleaning, we estimate the signal to noise, and show that the bispectrum is detectable by
both SKA in single-dish mode and HIRAX in interferometer mode, especially at the lower
redshifts in their respective ranges.
Description
Keywords
Gravitational lensing, Redshift surveys, Bispectrum, Reionization, Cosmological
Citation
Kothari, R. et al. (2020). Full-sky bispectrum in redshift space for 21cm intensity maps. Journal of Cosmology and Astroparticle Physics, 2020(11),