Lorentz violation and ultrahigh-energy photons

Journal Article · Mon Sep 15 04:00:00 EDT 2008 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.78.063003· OSTI ID:21250797

Galaverni, Matteo ^[1]; Sigl, Guenter ^[2]

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1. Dipartimento di Fisica, Universita di Ferrara, via Saragat 1, I-44100 Ferrara (Italy)
2. II. Institut fuer Theoretische Physik, Universitaet Hamburg, Luruper Chaussee 149, 22761 Hamburg (Germany)

The propagation of photons, electrons and positrons at ultrahigh energies above {approx}10{sup 19} eV can be changed considerably if the dispersion relations of these particles are modified by terms suppressed by powers of the Planck scale. We recently pointed out that the current nonobservation of photons in the ultrahigh-energy cosmic ray flux at such energies can put strong constraints on such modified dispersion relations. In the present work we generalize these constraints to all three Lorentz invariance-breaking parameters that can occur in the dispersion relations for photons, electrons and positrons at first- and second-order suppression with the Planck scale. We also show how the excluded regions in these three-dimensional parameter ranges would be extended if ultrahigh-energy photons were detected in the future.

• OSTI ID: 21250797
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 6 Vol. 78; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
COSMIC RAY FLUX
DISPERSION RELATIONS
EEV RANGE
ELECTRONS
LORENTZ INVARIANCE
PHOTONS
POSITRONS
THREE-DIMENSIONAL CALCULATIONS