Orateur
Description
Cosmic birefringence (CB) angle refers tothe rotation of the linear polarization plane of Cosmic Microwave Background(CMB) radiations when parity-violating theories areconsidered. Weanalyze the Quantum Boltzmann equation for an ensemble of CMB photonsinteracting with axion and neutrinos (active and sterile) in the presence of ascalar metric perturbation. After calculating the C_l^{EB} to drive CB, we plot thesecontributions by considering CB measurement and discuss on parametricmass-coupling space of axion and neutrino. We show that for some of the axionmass-coupling parameters, the dominant contribution (consistency with ) is forneutrino and axion contribution suppresses neutrino one and vice versa. Inanother plot, we compare our results on the axion-neutrino parametric spacewith other experiments measuring the mass-coupling of axion.
