Cosmic Birefringence―Is Our Universe Parity Symmetric?

DOI

Bibliographic Information

Other Title
  • 宇宙複屈折――我々の宇宙はパリティ対称か？

Abstract

<p>A fascinating hint of cosmic birefringence was observed with 2.4σ statistical significance in polarization data of cosmic microwave background (CMB). Cosmic birefringence refers to the rotation of the polarization plane of the CMB photons. Measurements of cosmic birefringence had been limited by systematic uncertainty on calibrations of polarization sensitive detectors. A novel method mitigated the uncertainty using the polarized Galactic foreground emission as a calibrator. This results in the observation of non-zero cosmic birefringence. It may imply that the parity symmetry is broken in our Universe. Axion-like particle behaving as dark energy can explain the observed cosmic birefringence, if it is coupled to photon. Future CMB observations are expected to shed light on the origin of dark energy.</p>

Journal

  • Butsuri

    Butsuri 77 (9), 611-615, 2022-09-05

    The Physical Society of Japan

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Details 詳細情報について

  • CRID
    1390574798849185536
  • DOI
    10.11316/butsuri.77.9_611
  • ISSN
    24238872
    00290181
  • Text Lang
    ja
  • Data Source
    • JaLC
    • KAKEN
  • Abstract License Flag
    Disallowed

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