Constraining Anisotropic Lorentz Violation via the Spectral-lag Transition of GRB 160625B

Jun Jie Wei, Xue Feng Wu, Bin Bin Zhang, Lang Shao, Peter Mészáros, V. Alan Kostelecký

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Abstract

Violations of Lorentz invariance can lead to an energy-dependent vacuum dispersion of light, which results in arrival-time differences of photons with different energies arising from a given transient source. In this work, direction-dependent dispersion constraints are obtained on nonbirefringent Lorentz-violating effects using the observed spectral lags of the gamma-ray burst GRB 160625B. This burst has unusually large high-energy photon statistics, so we can obtain constraints from the true spectral time lags of bunches of high-energy photons rather than from the rough time lag of a single highest-energy photon. Also, GRB 160625B is the only burst to date having a well-defined transition from positive lags to negative lags, providing a unique opportunity to distinguish Lorentz-violating effects from any source-intrinsic time lag in the emission of photons of different energy bands. Our results place comparatively robust two-sided constraints on a variety of isotropic and anisotropic coefficients for Lorentz violation, including the first bounds on Lorentz-violating effects from operators of mass dimension 10 in the photon sector.

Original languageEnglish (US)
Article number115
JournalAstrophysical Journal
Volume842
Issue number2
DOIs
StatePublished - Jun 20 2017

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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    Wei, J. J., Wu, X. F., Zhang, B. B., Shao, L., Mészáros, P., & Kostelecký, V. A. (2017). Constraining Anisotropic Lorentz Violation via the Spectral-lag Transition of GRB 160625B. Astrophysical Journal, 842(2), [115]. https://doi.org/10.3847/1538-4357/aa7630