Full-sky bispectrum in redshift space for 21cm intensity maps

Ruth Durrer, Mona Jalilvand, Rahul Kothari, Roy Maartens, Francesco Montanari

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We compute the tree-level bispectrum of 21cm intensity mapping after reionisation. We work in the 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.
Original languageEnglish
Article number003
Number of pages18
JournalJournal of Cosmology and Astroparticle Physics
Publication statusPublished - 1 Dec 2020


  • astro-ph.CO
  • RCUK
  • STFC
  • ST/N000668/1


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