How to De-Rotate the Cosmic Microwave Background Polarization
Astrophysics
2009-04-08 v2 General Relativity and Quantum Cosmology
High Energy Physics - Phenomenology
Abstract
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.
Cite
@article{arxiv.0810.1286,
title = {How to De-Rotate the Cosmic Microwave Background Polarization},
author = {Marc Kamionkowski},
journal= {arXiv preprint arXiv:0810.1286},
year = {2009}
}
Comments
4 pages, this version to appear in PRL