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Limits on an Energy Dependence of the Speed of Light from a Flare of the Active Galaxy PKS 2155-304

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.

preprint2008arXivOpen access
H. E. S. S. Collaboration:F. Aharonian
astro-ph
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Open access3 authors1 topic
Imported metadata coverageMissing code, dataset, citation and institution fields are tracked without dominating the paper.Details
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H. E. S. S. Collaboration:F. Aharonian

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