Testing the Dipole Modulation Model in CMBR

Abstract

The hemispherical power asymmetry, observed in the CMBR data, has generally been interpreted in terms of the dipole modulation model for the temperature fluctuations. Here we point out that this model leads to several predictions, which can be directly tested in the current data. We suggest tests of the hemispherical power asymmetry both in real and multipole space. We find a significant signal of the dipole modulation model in WMAP and PLANCK data with our tests. The dipole amplitude and direction also agrees, within errors, with earlier results based on hemispherical analysis in multipole space. We also find evidence that the effective dipole modulation amplitude increases with the multipole l in the range l=2-64.

12 pages, 3 figures, major changes

References in corpus (5)

• Hemispherical power asymmetry in the three-year Wilkinson Microwave Anisotropy Probe sky maps
• Superhorizon Perturbations and the Cosmic Microwave Background
• Broken Isotropy from a Linear Modulation of the Primordial Perturbations
• The small scale power asymmetry in the cosmic microwave background
• CMB Power Asymmetry from Primordial Sound Speed Parameter

Cited by in corpus (21)

• Is the Observable Universe Consistent with the Cosmological Principle?
• Power asymmetry in WMAP and Planck temperature sky maps as measured by a local variance estimator
• Microwave Background Correlations from Dipole Anisotropy Modulation
• Hemispherical Power Asymmetry from a Space-Dependent Component of the Adiabatic Power Spectrum
• Expected dipole asymmetry in CMB polarization
• Dipole Modulation of Cosmic Microwave Background Temperature and Polarization
• Probing statistical isotropy of cosmological radio sources using SKA
• North-South non-Gaussian asymmetry in PLANCK CMB maps
• Relating the inhomogeneous power spectrum to the CMB hemispherical anisotropy
• CMB hemispherical asymmetry from non-linear isocurvature perturbations
• Imprint of Inhomogeneous and Anisotropic Primordial Power Spectrum on CMB Polarization
• Clustering of Local Extrema in Planck CMB maps
• Testing statistical Isotropy in Cosmic Microwave Background Polarization maps
• Detection of Dipole Modulation in CMB Temperature Anisotropy Maps from WMAP and Planck using Artificial Intelligence
• Noncommutative Geometry and the Primordial Dipolar Imaginary Power Spectrum
• Cosmological Power Spectrum in Non-commutative Space-time
• A Pixel Space Method for Testing Dipole Modulation in the CMB Polarization
• Finsler space-time can explain both parity asymmetry and power deficit seen in CMB temperature anisotropies
• Anisotropic power spectrum and the observed low-l power in PLANCK CMB data
• CMB Polarization by the Asymmetric Template of Scalar Perturbations
• Large-scale structure with superhorizon isocurvature dark energy