Limits on an energy dependence of the speed of light from a flare of the active galaxy PKS 2155-304

Astronomy and Astrophysics – Astrophysics

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Scientific paper

The study of time-lags in light curves with Wavelet methods or Cross-correlation functions for distant astrophysical sources like active galaxies, as a function of energy, may lead to a detection of Lorentz symmetry breaking or effects due to Quantum Gravity in extra-dimension models. In this paper a search for such timelags during the H.E.S.S. observations of the exceptional Very High Energy flare of the active galaxy PKS 2155-304 on 28 July in 2006 is presented. Since no significant time-lag value was found on the minute level, the 95% Confidence Limit on the Quantum Gravity scale is set to 0.5 - 0.7 10^{18} GeV, considering only a linear term in the standard photon dispersion relation.

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