Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2001-12-14
Phys.Rev. D66 (2002) 081302
Physics
High Energy Physics
High Energy Physics - Phenomenology
4 pages, RevTeX4, 1 figure. Some references and a footnote added, improved discussion on the photon annihilation and GZK cutof
Scientific paper
10.1103/PhysRevD.66.081302
We analyze observational constraints from TeV astrophysics on Lorentz violating nonlinear dispersion for photons and electrons without assuming any a priori equality between the photon and electron parameters. The constraints arise from thresholds for vacuum Cerenkov radiation, photon decay and photo-production of electron-positron pairs. We show that the parameter plane for cubic momentum terms in the dispersion relations is constrained to an order unity region in Planck units. We find that the threshold configuration can occur with an asymmetric distribution of momentum for pair creation, and with a hard photon for vacuum Cerenkov radiation.
Jacobson Ted
Liberati Stefano
Mattingly David
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