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Weak lensing of the CMB

journal contribution
posted on 2023-06-08, 06:46 authored by Duncan Hanson, Anthony Challinor, Antony LewisAntony Lewis
The cosmic microwave background (CMB) represents a unique source for the study of gravitational lensing. It is extended across the entire sky, partially polarized, located at the extreme distance of z = 1,100, and is thought to have the simple, underlying statistics of a Gaussian random field. Here we review the weak lensing of the CMB, highlighting the aspects which differentiate it from the weak lensing of other sources, such as galaxies. We discuss the statistics of the lensing deflection field which remaps the CMB, and the corresponding effect on the power spectra. We then focus on methods for reconstructing the lensing deflections, describing efficient quadratic maximum-likelihood estimators and delensing. We end by reviewing recent detections and observational prospects.

History

Publication status

  • Published

Journal

General Relativity and Gravitation

ISSN

0001-7701

Publisher

Springer Verlag

Issue

9

Volume

42

Page range

2197-2218

Department affiliated with

  • Physics and Astronomy Publications

Full text available

  • No

Peer reviewed?

  • Yes

Legacy Posted Date

2012-02-06

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