2012/08/31 by Kenji Toma, Shinji Mukohyama, Daisuke Yonetoku +11 · 1 citation
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Noncommutative and Quantum Gravity Theories #astro-ph.HE #gr-qc #hep-ph #hep-th
paper · pdf · doi:10.1103/physrevlett.109.241104
4 pages; accepted for publication in Physical Review Letters; redshift estimates of GRBs changed (i.e z=0.382 was wrong for GRB 110721A) and calculations of ξlimit improved from the previous version
arxiv created 2012/11/09 · openalex publication_date 2012/12/13 · arxiv updated 2013/05/29 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We report the strictest observational verification of CPT invariance in the photon sector, as a result of \ensuremathγ-ray polarization measurement of distant gamma-ray bursts (GRBs), which are the brightest stellar-sized explosions in the Universe. We detected \ensuremathγ-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_\ifmmode±\else\textpm\fi2=p2\ifmmode±\else\textpm\fi2\ensuremathξp3/MPl, where \ifmmode±\else\textpm\fi denotes different circular polarization states of the photon, the parameter \ensuremathξ is constrained as |\ensuremathξ|<O(10^\ensuremath-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.