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Physical Review Letters 100 (2008) 021102
Lorentz Violation for Photons and Ultra-High Energy Cosmic Rays
M. Galaverni, G. Sigl1

Lorentz symmetry breaking at very high energies may lead to photon dispersion relations of the form omega^2=k^2+m^2+xi_n k^2(k/M_Pl)^n with new terms suppressed by a power n of the Planck mass M_Pl. We show that first and second order terms of size xi_1 >~ 10^(-14) and xi_2 >~ 10^(-6), respectively, would lead to a photon component in cosmic rays above 10^(19) eV that should already have been detected. Only effects suppressed by at least third order in the Planck scale appear consistent with observations.
1 :  APC - UMR 7164 - AstroParticule et Cosmologie
Physique/Astrophysique/Cosmologie et astrophysique extra-galactique

Planète et Univers/Astrophysique/Cosmologie et astrophysique extra-galactique

Physique/Relativité Générale et Cosmologie Quantique

Planète et Univers/Astrophysique
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