Threshold effects and Lorentz symmetry

, 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 phenomenologically interesting deformations of the relativistic dispersion relation may arise are briefly discussed.

Note:

7 pages. Talk presented at the ``Decoherence, Information, Complexity and Entropy 2002'', Piombino, Italy, September 2002

talk: Piombino 2002/09/02
violation: Lorentz
GZK effect
photon: cosmic radiation
pi: stability
showers: air
dispersion relation: relativistic
dispersion relation: deformation
threshold: effect
violation: CPT

References(70)

Figures(0)

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