Testing statistical Isotropy in Cosmic Microwave Background Polarization maps

We apply our symmetry based Power tensor technique to test conformity of PLANCK Polarization maps with statistical isotropy. On a wide range of angular scales (l=40-150), our preliminary analysis detects many statistically anisotropic multipoles in foreground cleaned full sky PLANCK polarization map...

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Bibliographic Details
Published inarXiv.org
Main Authors Rath, Pranati K, Pramoda Kr Samal, Panda, Srikanta, Mishra, Debesh D, Aluri, Pavan K
Format Paper Journal Article
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 03.01.2018
Subjects
Anisotropy
Big Bang theory
Cosmic microwave background
Isotropy
Masks
Multipoles
Physics - Cosmology and Nongalactic Astrophysics
Polarization
Tensors
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Summary:We apply our symmetry based Power tensor technique to test conformity of PLANCK Polarization maps with statistical isotropy. On a wide range of angular scales (l=40-150), our preliminary analysis detects many statistically anisotropic multipoles in foreground cleaned full sky PLANCK polarization maps viz., COMMANDER and NILC. We also study the effect of residual foregrounds that may still be present in the galactic plane using both common UPB77 polarization mask, as well as the individual component separation method specific polarization masks. However some of the statistically anisotropic modes still persist, albeit significantly in NILC map. We further probed the data for any coherent alignments across multipoles in several bins from the chosen multipole range.
ISSN:2331-8422
DOI:10.48550/arxiv.1707.04076