Abstract
The coupling of a scalar field to electromagnetic field via the Chern-Simons term will rotate the polarization directions of thecosmic microwave background radiation. The rotation angle which relies on the distribution of the scalar field on the CMB sky isdirection dependent. Such anisotropies will give rise to new distortions to the power spectra of CMB polarization and it can be used toprobe the detailed physics of the scalar field. In this paper we use the updated observational data to constrain the anisotropic rotationangle in a model independent way. We find that the dominant effect of the anisotropic rotation on CMB comes from its variance and it isconstrained tightly by the current data.
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