Cosmological birefringence constraints from CMB and astrophysical polarization data

Understand

Cosmological birefringence is a rotation of the polarization plane of photons coming from sources of astrophysical and cosmological origin.

• The rotation can also depend on the energy of the photons and not only on the distance of the source and on the cosmological evolution of the underlying theoretical model.
• In this work, we constrain few selected models for cosmological birefringence, combining CMB and astrophysical data at radio, optical, X and gamma wavelengths, taking into account the specific energy and distance dependences.