Lensing contribution to the 21cm intensity bispectrum

Rahul Kothari, Roy Maartens

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Intensity maps of the 21cm emission line of neutral hydrogen are lensed by intervening large-scale structure, similar to the lensing of the cosmic microwave background temperature map. We extend previous work by calculating the lensing contribution to the full-sky 21cm bispectrum in redshift space. The lensing contribution tends to peak when equal-redshift fluctuations are lensed by a lower redshift fluctuation. At high redshift, lensing effects can become comparable to the contributions from density and redshift-space distortions.
Original languageEnglish
Article number095013
Pages (from-to)1-12
Number of pages12
JournalClassical and Quantum Gravity
Issue number9
Publication statusPublished - 14 Apr 2021


  • astro-ph.CO
  • gr-qc
  • UKRI
  • STFC
  • ST/S000550/1


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