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Generation of circular polarization of the CMB

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arxiv 0912.2993 v5 pith:PF7UARUJ submitted 2009-12-16 hep-th astro-ph.COhep-ph

classification hep-thastro-ph.COhep-ph
keywords polarizationcircularphotonsscatteringstandardaccordingacquiresbackground
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According to the standard cosmology, near the last scattering surface, the photons scattered via Compton scattering are just linearly polarized and then the primordial circular polarization of the CMB photons is zero. In this work we show that CMB polarization acquires a small degree of circular polarization when a background magnetic field is considered or the quantum electrodynamic sector of standard model is extended by Lorentz-noninvariant operators as well as noncommutativity. The existence of circular polarization for the CMB radiation may be verified during future observation programs and it represents a possible new channel for investigating new physics effects.

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