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

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 signif...

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Bibliographic Details
Published in:Physical review letters 2012-12, Vol.109 (24), p.241104-241104
Main Authors: Toma, Kenji, Mukohyama, Shinji, Yonetoku, Daisuke, Murakami, Toshio, Gunji, Shuichi, Mihara, Tatehiro, Morihara, Yoshiyuki, Sakashita, Tomonori, Takahashi, Takuya, Wakashima, Yudai, Yonemochi, Hajime, Toukairin, Noriyuki
Format: Article
Language:English
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Summary: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) = p(2) ± 2ξp(3)/M(Pl), where ± denotes different circular polarization states of the photon, the parameter ξ is constrained as |ξ|
ISSN:1079-7114
DOI:10.1103/PhysRevLett.109.241104