Addendum: Ultrahigh-energy cosmic-ray bounds on nonbirefringent modified Maxwell theory
Abstract
Nonbirefringent modified-Maxwell theory, coupled to standard Dirac particles, involves nine dimensionless parameters, which can be bounded by the inferred absence of vacuum Cherenkov radiation for ultrahigh-energy cosmic rays (UHECRs). With selected UHECR events, two-sided bounds on the eight nonisotropic parameters are obtained at the 10-18 level, together with an improved one-sided bound on the single isotropic parameter at the 10-19 level.
- Publication:
-
Physical Review D
- Pub Date:
- June 2008
- DOI:
- arXiv:
- arXiv:0806.4351
- Bibcode:
- 2008PhRvD..77k7901K
- Keywords:
-
- 11.30.Cp;
- 12.20.-m;
- 41.60.Bq;
- 98.70.Sa;
- Lorentz and Poincare invariance;
- Quantum electrodynamics;
- Cherenkov radiation;
- Cosmic rays;
- High Energy Physics - Phenomenology
- E-Print:
- 5 pages with revtex4