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Lensing contribution to the 21cm intensity bispectrum

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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


  • Kothari_&_Maartens_2021_AAM

    Rights statement: This Accepted Manuscript is available for reuse under a CC BY-NC-ND licence after the 12 month embargo period provided that all the terms and conditions of the licence are adhered to.

    Accepted author manuscript (Post-print), 964 KB, PDF document

    Due to publisher’s copyright restrictions, this document is not freely available to download from this website until: 14/04/22

    Licence: CC BY-NC-ND

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