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

2010/06/30 by A. Gruppuso, F. Finelli, P. Natoli +4 · 77 citations
Physics and Astronomy · #Anisotropy #CMB cold spot #Cosmic background radiation #Cosmic microwave background #Cosmology and Gravitation Theories #Electrical and Electromagnetic Research #Monte Carlo method #Noncommutative and Quantum Gravity Theories #Parity (physics) #Planck #Polarization (electrochemistry) #astro-ph.CO

paper · pdf · doi:10.1111/j.1365-2966.2010.17773.x

published in Monthly Notices of the Royal Astronomical Society 411(3), 1445-1452 (Oxford University Press) · 8 pages, 6 figures, 4 tables. Accepted for publication in MNRAS

arxiv created 2010/09/27 · openalex publication_date 2010/11/15 · arxiv updated 2011/06/21 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

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.

Citations

• Testing the cosmological principle of isotropy: local power-spectrum estimates of theWMAPdata
• Detection of a non-Gaussian spot in WMAP
• No large-angle correlations on the non-Galactic microwave sky

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