Photon dispersion in causal sets
arXiv:0912.3839
Abstract
A very small dispersion in the speed of light may be observable in Fermi time- and energy-tagged data on variable sources, such as gamma-ray bursts (GRB) and active galactic nuclei (AGN). We describe a method to compute the size of this effect by applying the Feynman sum-over-histories formalism for relativistic quantum electrodynamics to a discrete model of space-time called \emph{causal set theory}.
2009 Fermi Symposium, eConf Proceedings C091122. 5 pages, 2 figures
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