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T: Fachverband Teilchenphysik

T 75: Gammaastronomie IV

T 75.9: Talk

Thursday, March 6, 2008, 18:45–19:00, KGII-HS 2006

Probing Quantum Gravity with the VHE flares of PKS 2155-3004 in 2006 — •Rolf Buehler for the H.E.S.S. collaboration — Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg

Several Quantum Gravity models predict an energy depend dispersion relation for photons in vacuum, leading to small differences in the speed of light between photons of different energies. This minute effect was predicted to add up to measurable time lags for photons which travel over cosmological distances. Here we present a search for such time lags during the H.E.S.S. observations of the exceptional VHE flares of PKS 2155-304 in July 2006. Since no time lag is found, we derive lower limits on the energy scale on which these quantum gravity effects could become important.