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Published March 20, 2009 | Published
Journal Article Open

How to Derotate the Cosmic Microwave Background Polarization


If the linear polarization of the cosmic microwave background is rotated in a frequency-independent manner as it propagates from the surface of last scatter, it may introduce a B-mode polarization. Here I show that measurement of higher-order TE, EE, EB, and TB correlations induced by this rotation can be used to reconstruct the rotation angle as a function of position on the sky. This technique can be used to distinguish primordial B modes from those induced by rotation. The effects of rotation can be distinguished geometrically from similar effects due to cosmic shear.

Additional Information

© 2009 The American Physical Society. Received 7 October 2008; revised 12 February 2009; published 19 March 2009. I thank A. Cooray, C. Hirata, and V. Gluscevic for useful comments. This work was supported by DoE Grant No. DE-FG03-92-ER40701.

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Published - Kamionkowski2009p1320Phys_Rev_Lett.pdf


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