How to De-Rotate the Cosmic Microwave Background Polarization

Details How to De-Rotate the Cosmic Microwave Background Polarization How to De-Rotate the Cosmic Microwave Background Polarization

2008-10-07

arxiv.org/abs/0810.1286v2

Phys.Rev.Lett.102:111302,2009

Astronomy and Astrophysics

Astrophysics

4 pages, this version to appear in PRL

Scientific paper

10.1103/PhysRevLett.102.111302

If the linear polarization of the cosmic microwave background (CMB) 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.

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