Primordial Magnetism in CMB B-modes
  Cosmic Microwave Background (CMB) polarization B-modes induced by Faraday
Rotation (FR) can provide a distinctive signature of primordial magnetic fields
because of their characteristic frequency dependence and because they are only
weakly damped on small scales. FR also leads to mode-coupling correlations
between the E and B type polarization, and between the temperature and the
B-mode. These additional correlations can further help distinguish magnetic
fields from other sources of B-modes. We review the FR induced CMB signatures
and present the constraints on primordial magnetism that can be expected from
upcoming CMB experiments. Our results suggest that FR of CMB will be a
promising probe of primordial magnetic fields.
