Generation of circular polarization of the CMB

Details Generation of circular polarization of the CMB Generation of circular polarization of the CMB

2009-12-16

arxiv.org/abs/0912.2993v5

Phys.Rev.D81:084035,2010

Physics

High Energy Physics

High Energy Physics - Theory

28 pages, v3, Phys. Rev. D 81, 084035 (2010)

Scientific paper

10.1103/PhysRevD.81.084035

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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