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Reconstruction of lensing from the cosmic microwave background polarization

Hirata, Christopher M. and Seljak, Uroš (2003) Reconstruction of lensing from the cosmic microwave background polarization. Physical Review D, 68 (8). Art. No. 083002. ISSN 0556-2821. http://resolver.caltech.edu/CaltechAUTHORS:HIRprd03b

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Abstract

Gravitational lensing of the cosmic microwave background (CMB) polarization field has been recognized as a potentially valuable probe of the cosmological density field. We apply likelihood-based techniques to the problem of lensing of CMB polarization and show that if the B-mode polarization is mapped, then likelihood-based techniques allow significantly better lensing reconstruction than is possible using the previous quadratic estimator approach. With this method the ultimate limit to lensing reconstruction is not set by the lensed CMB power spectrum. Second-order corrections are known to produce a curl component of the lensing deflection field that cannot be described by a potential; we show that this does not significantly affect the reconstruction at noise levels greater than 0.25 μK arcmin. The reduction of the mean squared error in the lensing reconstruction relative to the quadratic method can be as much as a factor of two at noise levels of 1.4 μK arcmin to a factor of ten at 0.25 μK arcmin, depending on the angular scale of interest.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1103/PhysRevD.68.083002UNSPECIFIEDUNSPECIFIED
http://link.aps.org/abstract/PRD/v68/e083002UNSPECIFIEDUNSPECIFIED
Additional Information:©2003 The American Physical Society. Received 18 June 2003; published 22 October 2003. We would like to thank Wayne Hu and Lyman Page for useful comments. C.H. acknowledges useful discussions with Mike Kesden, Asantha Cooray, and Marc Kamionkowski. C.H. is supported by the NASA Graduate Student Research Program, grant no. NTGT5-50383. U.S. acknowledges support from Packard and Sloan Foundations, NASA NAG5-11983 and NSF CAREER-0132953.
Group:TAPIR
Funders:
Funding AgencyGrant Number
NASA Graduate Student Research ProgramNTGT5-50383
David and Lucille Packard FoundationUNSPECIFIED
Alfred P. Sloan FoundationUNSPECIFIED
NASANAG5-11983
National Science FoundationNSF CAREER-0132953
Record Number:CaltechAUTHORS:HIRprd03b
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:HIRprd03b
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:11093
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:14 Jul 2008 21:26
Last Modified:26 Dec 2012 10:08

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