Expected dipole asymmetry in CMB polarization
  We explore the hemispherical asymmetry predicted in cosmic microwave
background polarization when there is an asymmetry in temperature anisotropies
due to primordial perturbations. We consider the cases of asymmetries due to
adiabatic and isocurvature modes, and tensor perturbations. We show that the
asymmetry in the TE, EE and/or BB correlations can be substantially larger than
those in the TT power spectrum in certain cases. The relative asymmetry in the
different cross-correlations, as well as the angular scale dependence, can in
principle distinguish between different origins for the asymmetry.
