Journal Article

New constraints on parity symmetry from a re-analysis of the <i>WMAP</i>-7 low-resolution power spectra

A. Gruppuso, F. Finelli, P. Natoli, F. Paci, P. Cabella, A. De Rosa and N. Mandolesi

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 411, issue 3, pages 1445-1452
Published in print March 2011 | ISSN: 0035-8711
Published online February 2011 | e-ISSN: 1365-2966 | DOI:
New constraints on parity symmetry from a re-analysis of the WMAP-7 low-resolution power spectra

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The parity symmetry of the cosmic microwave background (CMB) pattern as seen by Wilkinson Microwave Anisotropy Probe 7 yr (WMAP 7 yr) is tested jointly in temperature and polarization at large angular scale. A quadratic maximum likelihood (QML) estimator is applied to the WMAP 7-yr low-resolution maps to compute all polarized CMB angular power spectra. The analysis is supported by 10 000 realistic Monte Carlo realizations. We confirm the previously reported parity anomaly for TT in the range δℓ=[2, 22] at >99.5 per cent C.L. No anomalies have been detected in TT for a wider ℓ range (up to ℓmax= 40). No violations have been found for EE, TE and BB which we test here for the first time. The cross-spectra TB and EB are found to be consistent with zero. We also forecast Planck capabilities in probing parity violations on low-resolution maps.

Keywords: methods: numerical; methods: statistical; cosmic background radiation; cosmology: observations; cosmology: theory

Journal Article.  4175 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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