Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-10-20
Phys.Rev.Lett.101:170402,2008
Astronomy and Astrophysics
Astrophysics
Accepted for publication by Phys. Rev. Letters
Scientific paper
10.1103/PhysRevLett.101.170402
In the past few decades, several models have predicted an energy-dependence of the speed of light in the context of quantum gravity. For cosmological sources such as active galaxies, this minuscule effect can add up to measurable photon-energy dependent time lags. In this paper a search for such time lags 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 is found, lower limits on the energy scale of speed of light modifications are derived.
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