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  New extraction of the cosmic birefringence from the Planck 2018 polarization data

Minami, Y., & Komatsu, E. (2020). New extraction of the cosmic birefringence from the Planck 2018 polarization data. Physical Review Letters, 125(22): 221301. doi:10.1103/PhysRevLett.125.221301.

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New extraction of the cosmic birefringence from the Planck 2018 polarization data.pdf (Any fulltext), 2MB
 
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Minami, Yuto, Author
Komatsu, Eiichiro1, Author              
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1Physical Cosmology, MPI for Astrophysics, Max Planck Society, ou_2205644              

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 Abstract: We search for evidence of parity-violating physics in the Planck 2018 polarization data and report on a new measurement of the cosmic birefringence angle β. The previous measurements are limited by the systematic uncertainty in the absolute polarization angles of the Planck detectors. We mitigate this systematic uncertainty completely by simultaneously determining β and the angle miscalibration using the observed cross-correlation of the E- and B-mode polarization of the cosmic microwave background and the Galactic foreground emission. We show that the systematic errors are effectively mitigated and achieve a factor-of-2 smaller uncertainty than the previous measurement, finding β=0.35±0.14  deg (68% C.L.), which excludes β=0 at 99.2% C.L. This corresponds to the statistical significance of 2.4σ.

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Language(s): eng - English
 Dates: 2020-11-23
 Publication Status: Published online
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 Identifiers: DOI: 10.1103/PhysRevLett.125.221301
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Title: Physical Review Letters
  Abbreviation : Phys. Rev. Lett.
Source Genre: Journal
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Publ. Info: Woodbury, N.Y. : American Physical Society
Pages: - Volume / Issue: 125 (22) Sequence Number: 221301 Start / End Page: - Identifier: ISSN: 0031-9007
CoNE: https://pure.mpg.de/cone/journals/resource/954925433406_1