 97648 Luis GonzalezMestres
 Physics opportunities above the GreisenZatsepinKuzmin cutoff: Lorentz
symmetry violation at the Planck scale
(203K, PS)
Dec 26, 97

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Abstract. Special relativity has been tested at low energy with great
accuracy, but these results cannot be extrapolated to very highenergy
phenomena: this new domain of physics may actually provide the key to
the, yet unsettled, question of the ether and the absolute rest frame.
Introducing a critical distance scale, a , below 10E25 cm (the wavelength
scale of the highestenergy observed cosmic rays) allows to consider
models, compatible with standard tests of special relativity, where a
small violation of Lorentz symmetry (a can, for instance, be the Planck
length) leads to a deformed relativistic kinematics (DRK) producing
dramatic effects on the properties of very highenergy cosmic rays. For
instance, the GreisenZatsepinKuzmin (GZK) cutoff does no longer apply
and particles which are unstable at low energy (neutron, some hadronic
resonances like the Delta++ , possibly several nuclei...) become stable at
very high energy. In these models, an absolute local rest frame exists
(the vacuum rest frame, VRF) and special relativity is a lowmomentum
limit. We discuss the possible effects of Lorentz symmetry violation (LSV)
on kinematics and dynamics, as well as the cosmicray energy range (well
below the energy scale associated to the fundamental length) and
experiments (on earth and from space) where they could be detected.
Invited talk at the Workshop on "Observing Giant Cosmic Ray Air Showers
for > 10E20 eV Particles from Space", Univ. of Maryland, Nov 1315, 1997.
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