The axis of evil - a polarization perspective

Abstract

We search for an unusual alignment of the preferred axes of the quadrupole and octopole, the so-called axis of evil, in the CMB temperature and polarization data from WMAP. We use the part of the polarization map which is uncorrelated with the temperature map as a statistically independent probe of the axis of evil, which helps to assess whether the latter has a cosmological origin or if is a mere chance fluctuation in the temperature. Note, though, that for certain models creating a preferred axis in the temperature map, we would not expect to see the axis in the uncorrelated polarization map. We find that the axis of the quadrupole of the uncorrelated polarization map roughly aligns with the axis of evil within our measurement precision, whereas the axis of the octopole does not. However, with our measurement uncertainty, the probability of such a scenario to happen by chance in an isotropic universe is of the order of 50 per cent. We also find that the so-called cold spot present in the CMB temperature map is even colder in the part of the temperature map which is uncorrelated with the polarization, although there is still a large uncertainty in the latter. Therefore, our analysis of the axis of evil and a future analysis of the cold spot in the uncorrelated temperature data will strongly benefit from the polarization data expected from the Planck satellite.

Version accepted by MNRAS, added some comments, corrected typos

References in corpus (24)

• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Data Processing, Sky Maps, and Basic Results
• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Likelihoods and Parameters from the WMAP data
• Three Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Polarization Analysis
• Three-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Temperature Analysis
• Hemispherical power asymmetry in the three-year Wilkinson Microwave Anisotropy Probe sky maps
• The Uncorrelated Universe: Statistical Anisotropy and the Vanishing Angular Correlation Function in WMAP Years 1-3
• The Axis of Evil revisited
• Local Voids as the Origin of Large-angle Cosmic Microwave Background Anomalies: The Effect of a Cosmological Constant
• Bianchi Type VII_h Models and the WMAP 3-year Data
• Testable polarization predictions for models of CMB isotropy anomalies
• Global universe anisotropy probed by the alignment of structures in the cosmic microwave background
• Correlating anomalies of the microwave sky: The Good, the Evil and the Axis
• On the CMB large-scales angular correlations
• Alignment tests for low CMB multipoles
• Testing Isotropy of Cosmic Microwave Background Radiation
• Alignment and signed-intensity anomalies in WMAP data
• The axis of evil - a polarization perspective
• Anomalous CMB north-south asymmetry
• Statistical Isotropy of CMB Polarization Maps
• Measuring Statistical Isotropy of CMB Anisotropy
• Large scale alignment anomalies of CMB anisotropies: a new test for residuals applied to WMAP 5yr maps
• Optimal ISW detection and joint likelihood for cosmological parameter estimation
• Angular-planar CMB power spectrum
• Large scale vector modes and the first CMB temperature multipoles

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