Lensing contribution to the 21 cm intensity bispectrum. (14th April 2021)

• Record Type: Journal Article
• Authors: Kothari, Rahul; Maartens, Roy
• Is Part Of: Classical and quantum gravity. Volume 38:Number 9(2021)
• Publication Date: 2021-04-14
• Subjects: gravitational lensing -- redshift surveys -- 21 cm cosmology; Quantum gravity -- Periodicals; Gravitation -- Periodicals; Relativity (Physics) -- Periodicals; Space and time -- Periodicals; Periodicals; 521.1
• DOI: 10.1088/1361-6382/abf1c1
• Languages: English
• ISSNs: 0264-9381

Abstract

Abstract: Intensity maps of the 21 cm 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 21 cm 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.