Weak lensing of the CMB

Hanson, Duncan, Challinor, Anthony and Lewis, Antony (2010) Weak lensing of the CMB. General Relativity and Gravitation, 42 (9). pp. 2197-2218. ISSN 0001-7701

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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.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Depositing User: Antony Lewis
Date Deposited: 06 Feb 2012 20:33
Last Modified: 20 Apr 2012 12:59
URI: http://sro.sussex.ac.uk/id/eprint/26625
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