Strict limit on CPT violation from polarization of γ-ray bursts

Kenji Toma, Shinji Mukohyama, Daisuke Yonetoku, Toshio Murakami, Shuichi Gunji, Tatehiro Mihara, Yoshiyuki Morihara, Tomonori Sakashita, Takuya Takahashi, Yudai Wakashima, Hajime Yonemochi, Noriyuki Toukairin

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35 Citations (Scopus)

Abstract

We report the strictest observational verification of CPT invariance in the photon sector, as a result of γ-ray polarization measurement of distant gamma-ray bursts (GRBs), which are the brightest stellar-sized explosions in the Universe. We detected γ-ray polarization of three GRBs with high significance levels, and the source distances may be constrained by a well-known luminosity indicator for GRBs. For the Lorentz- and CPT-violating dispersion relation E±2=p2±2ξp3/MPl, where ± denotes different circular polarization states of the photon, the parameter ξ is constrained as |ξ|<O(10-15). Barring precise cancellation between quantum gravity effects and dark energy effects, the stringent limit on the CPT-violating effect leads to the expectation that quantum gravity presumably respects the CPT invariance.

Original languageEnglish
Article number241104
JournalPhysical review letters
Volume109
Issue number24
DOIs
Publication statusPublished - 2012 Dec 13
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Toma, K., Mukohyama, S., Yonetoku, D., Murakami, T., Gunji, S., Mihara, T., Morihara, Y., Sakashita, T., Takahashi, T., Wakashima, Y., Yonemochi, H., & Toukairin, N. (2012). Strict limit on CPT violation from polarization of γ-ray bursts. Physical review letters, 109(24), [241104]. https://doi.org/10.1103/PhysRevLett.109.241104