Abstract
Evidence on the violation of Lorentz symmetry arises from the observation of cosmic rays with energies beyond the GZK cutoff, E GZK ≃ 4 × 1019 eV, from the apparent transparency of the Universe to the propagation of high energy gamma radiation, and from the stability of pions in air showers. These three paradoxes can be explained through deformations of the relativistic dispersion relation. Theoretical ideas aimed to understand how Lorentz symmetry may be broken and how phenomenologically interesting deformations of the relativistic dispersion relation may arise are briefly discussed.KeywordsCosmic Microwave BackgroundLorentz InvarianceLorentz SymmetryPair CreationCosmic Microwave Background PhotonThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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