We present a new upper limit on cosmic microwave background (CMB) circular polarization
from the 2015 flight of Spider, a balloon-borne telescope designed to search for B-mode …

Circular polarization of the cosmic microwave background (CMB) can be induced by
Faraday conversion of the primordial linearly polarized radiation as it propagates through a …

Standard models describing the radiation transfer of the cosmic microwave background
(CMB) through Compton scattering predict that cosmological scalar perturbations at linear …

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 …

Recent literature has shown that photon-photon forward scattering mediated by Euler-
Heisenberg interactions may generate some amount of the circular polarization (V modes) in …

The circular polarization of the cosmic microwave background (CMB) is usually taken to be
zero since it is not generated by Thomson scattering. Here we explore the actual level of …

Standard cosmological models do predict a measurable amount of anisotropies in the
intensity and linear polarization of the cosmic microwave background radiation (CMB) via …

While it is revealed that the cosmic microwave background (CMB) is linearly polarized at
10% level, it is predicted that there exists no significant intrinsic source for circular …

In the standard model of cosmology (SMC) the B-mode polarization of the CMB can be
explained by the gravitational effects in the inflation epoch. However, this is not the only way …

Circular polarization is a relatively unexplored realm of CMB physics. Given the substantial
community effort towards building next generation CMB polarization experiments, including …