Lensing contribution to the 21cm intensity bispectrum
Cosmology and Nongalactic Astrophysics
2021-04-16 v2 General Relativity and Quantum Cosmology
Abstract
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.
Cite
@article{arxiv.2101.11372,
title = {Lensing contribution to the 21cm intensity bispectrum},
author = {Rahul Kothari and Roy Maartens},
journal= {arXiv preprint arXiv:2101.11372},
year = {2021}
}
Comments
8 pages + 2 appendices + references. Version accepted by Class. Quant. Grav