Speaker
Matteo Galaverni
(Vatican Observatory & INAF/OAS Bologna)
Description
Cosmic birefringence is a rotation of the polarization plane of photons coming from sources of astrophysical and cosmological origin. We discuss the imprints of a cosmological pseudoscalar field on Cosmic Microwave Background (CMB) propagation. Phenomenological or theoretically motivated redshift dependence of the pseudoscalar fields - such as axionlike dark matter, quintessence, or early dark energy - lead to CMB polarization power spectra which exhibit different multipole dependencies.
Primary author
Matteo Galaverni
(Vatican Observatory & INAF/OAS Bologna)
