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Cosmic shear of the microwave background: The curl diagnostic

Cooray, Asantha and Kamionkowski, Marc and Caldwell, Robert R. (2005) Cosmic shear of the microwave background: The curl diagnostic. Physical Review D, 71 (12). Art. No. 123527. ISSN 0556-2821. http://resolver.caltech.edu/CaltechAUTHORS:COOprd05

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Abstract

Weak-lensing distortions of the cosmic-microwave-background (CMB) temperature and polarization patterns can reveal important clues to the intervening large-scale structure. The effect of lensing is to deflect the primary temperature and polarization signal to slightly different locations on the sky. Deflections due to density fluctuations, gradient-type for the gradient of the projected gravitational potential, give a direct measure of the mass distribution. Curl-type deflections can be induced by, for example, a primordial background of gravitational waves from inflation or by second-order effects related to lensing by density perturbations. Whereas gradient-type deflections are expected to dominate, we show that curl-type deflections can provide a useful test of systematics and serve to indicate the presence of confusing secondary and foreground non-Gaussian signals.


Item Type:Article
Additional Information:©2005 The American Physical Society. Received 25 February 2005; published 28 June 2005. M.K. thanks C. Vale and C. Hirata for useful discussions. This work was supported in part by NASA NAG5-11985 and DoE DE-FG03-92-ER40701 at Caltech and NSF AST-0349213 at Dartmouth.
Group:TAPIR
Subject Keywords:LARGE-SCALE STRUCTURE; GRAVITY-WAVES; DARK-MATTER; GALAXY ELLIPTICITIES; DISTANT GALAXIES; POWER SPECTRUM; POLARIZATION
Record Number:CaltechAUTHORS:COOprd05
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:COOprd05
Alternative URL:http://dx.doi.org/10.1103/PhysRevD.71.123527
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:4280
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:11 Aug 2006
Last Modified:26 Dec 2012 08:58

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