The possibility of anisotropies in the speed of light relative to the limiting speed of electrons is considered. The absence of sidereal variations in the energy of Compton-edge photons at the European Synchrotron Radiation Facility's GRAAL facility constrains such anisotropies representing the first nonthreshold collision-kinematics study of Lorentz violation. When interpreted within the minimal standard-model extension, this result yields the two-sided limit of 1.6×10^-14 at 95% confidence level on a combination of the parity-violating photon and electron coefficients (κₒ₊)YZ, (κₒ₊)ZX, cTX, and cTY. This new constraint provides an improvement over previous bounds by 1 order of magnitude.
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Bocquet et al. (2010) studied this question.
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