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Constraints on birefringence-free photon theory within standard model extensions
Phys. Rev. D 113, 035036 – Published 26 February, 2026
DOI: https://doi.org/10.1103/ld2j-wk8z
Abstract
Constraints on the birefringence-free subset of Lorentz-violating (LV) operators are derived using 14 gamma-ray burst photons in the GeV band. These constraints target the isotropic coefficients for dimensions , 8, 10 within the framework of the Standard-Model extension. Employing theory-agnostic Bayesian parameter estimation methods, our analysis indicates a preference for subluminal LV effects. Focusing on this case, we further refine the parameter constraints, yielding results that are mutually consistent. Within the 95% posterior credible interval, our constraints yield the bounds, , , and , which improve upon the most stringent credible-interval bounds reported in the literature by at least five orders of magnitude.
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