Dipole Modulation of Cosmic Microwave Background Temperature and Polarization

TL;DR

This paper introduces a dipole modulation model for CMB polarization, predicts correlations between multipoles, and analyzes PLANCK data to detect these correlations, confirming previous temperature-based findings.

Contribution

The paper develops a dipole modulation model for CMB polarization and demonstrates its implications for multipole correlations, extending prior temperature-based analyses.

Findings

Temperature data analysis aligns with previous results.

Preliminary polarization data analysis suggests similar correlations.

Model predicts correlations in TE, EE, and BB polarization spectra.

Abstract

We propose a dipole modulation model for the Cosmic Microwave Background Radiation (CMBR) polarization field. We show that the model leads to correlations between l and l+1 multipoles, exactly as in the case of temperature. We obtain results for the case of TE, EE and BB correlations. An anisotropic or inhomogeneous model of primordial power spectrum which leads to such correlations in temperature field also predicts similar correlations in CMBR polarization. We analyze the CMBR temperature and polarization data in order to extract the signal of these correlation between l and l+1 multipoles. Our results for the case of temperature using the latest PLANCK data agree with those obtained by an earlier analysis. A detailed study of the correlation in the polarization data is not possible at present. Hence we restrict ourselves to a preliminary investigation in this case.