Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sf2a.conf..235j&link_type=abstract
"SF2A-2008: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics Eds.: C. Charbonnel, F. Combes
Astronomy and Astrophysics
Astrophysics
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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