Testing isotropy of cosmos with WMAP and PLANCK data

Abstract

In recent years, there have been a large number of studies which support violation of statistical isotropy. Meanwhile, there are some studies which also found inconsistency. We use the power tensor method defined earlier in the literature to study the new CMBR data. The orientation of these three orthogonal vectors, as well as the power associated with each vector, contains information about possible violation of statistical isotropy. This information is encoded in two entropy measures, the power-entropy and alignment- entropy. We apply this method to WMAP 9-year and PLANCK data. Here, we also revisit the statistics to test high-l anomaly reported in our earlier paper and find that the high degree of isotropy seen in earlier WMAP 5-year data is absent in the revised WMAP 9-year data.

arXiv comment7 Pages, 0 Figures, 4 Tables; Published in 2015; Accepted version added to arXiv now

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Cited by in corpus (8)

• Is the Observable Universe Consistent with the Cosmological Principle?
• Search for anomalous alignments of structures in Planck data using Minkowski Tensors
• The nature of non-Gaussianity and statistical isotropy of the 408 MHz Haslam synchrotron map
• Application of Contour Minkowski Tensor and $\mathcal{D}$ Statistic to the Planck $E$-mode data
• Testing statistical Isotropy in Cosmic Microwave Background Polarization maps
• Primordial Universe with radiation and Bose-Einstein condensate
• Entropy methods for CMB analysis of anisotropy and non-Gaussianity
• Statistical Isotropy of the CMB E-mode signal