Dipole Modulation of Cosmic Microwave Background Temperature and Polarization

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.

25 pages, 5 figures, major changes

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• Cosmological Power Spectrum in Non-commutative Space-time
• A Pixel Space Method for Testing Dipole Modulation in the CMB Polarization
• Anisotropic power spectrum and the observed low-l power in PLANCK CMB data
• A comprehensive study of Modulation effects on CMB Polarization
• SIToolBox : A package for Bayesian estimation of the isotropy violation in the CMB sky
• Large-scale structure with superhorizon isocurvature dark energy
• Weak Lensing Effect on CMB in the Presence of a Dipole Anisotropy