Expected dipole asymmetry in CMB polarization

Abstract

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.

arXiv commentv2: The presentation is improved, some figures are revised. 10 pages, 18 figures

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• Microwave Background Correlations from Dipole Anisotropy Modulation
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• Violation of statistical isotropy and homogeneity in the 21-cm power spectrum
• Dipole Modulation of Cosmic Microwave Background Temperature and Polarization
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