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Improved Constraints on Cosmic Birefringence from the WMAP and Planck Cosmic Microwave Background Polarization Data

2022/05/27 by Johannes R. Eskilt, Eiichiro Komatsu · 1 voice · 17 citations
Physics and Astronomy · #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Radio Astronomy Observations and Technology #astro-ph.CO

paper · pdf · doi:10.1103/physrevd.106.063503

9 pages, 5 figures, 1 table. The code to reproduce the results of this paper is available at https://github.com/LilleJohs/Cosmic_Birefringence. Accepted for publication in Physical Review D

openalex publication_date 2022/09/07 · arxiv created 2022/09/12 · openalex created_date 2022/09/15 · arxiv updated 2022/09/21 · openalex updated_date 2026/08/01

Abstract

The observed pattern of linear polarization of the cosmic microwave background (CMB) photons is a sensitive probe of physics violating parity symmetry under inversion of spatial coordinates. A new parity-violating interaction might have rotated the plane of linear polarization by an angle β as the CMB photons have been traveling for more than 13 billion years. This effect is known as "cosmic birefringence." In this paper, we present new measurements of cosmic birefringence from a joint analysis of polarization data from two space missions, Planck and WMAP. This dataset covers a wide range of frequencies from 23 to 353 GHz. We measure β= 0.342∘ +0.094^∘_\phantom∘ -0.091^∘ (68% C.L.) for nearly full-sky data, which excludes β=0 at 99.987% C.L. This corresponds to the statistical significance of 3.6σ. There is no evidence for frequency dependence of β. We find a similar result, albeit with a larger uncertainty, when removing the Galactic plane from the analysis.

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