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| Paper IPM / P / 13114 |
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| Abstract: | |
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The primordial anisotropies of the cosmic microwave background are linearly polarized via
Compton-scattering. On the other hand, a primordial degree of circular polarization of the Cosmic Microwave Background is
not observationally excluded. In this work, we discuss the generation of the circular polarization of CMB via their scattering on the
cosmic neutrino background since the
epoch of recombination. We show that photon-neutrino interaction can transform plane polarization into circular polarization through processes γ+ν→γ+ν and the Stokes-V
parameter of CMB has linear dependence on the wavelength and square dependence on the average bulk velocity of cosmic neutrino background and also the maximum value of CV is estimated in range of a few Nano-Kelvin square.
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