Ultrahigh-energy cosmic-ray bounds on nonbirefringent modified-Maxwell theory - High Energy Physics - PhenomenologyReportar como inadecuado




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Abstract: A particularly simple Lorentz-violating modification of the Maxwell theory ofphotons maintains gauge invariance, CPT, and renormalization. Thismodified-Maxwell theory, coupled to standard Dirac particles, involves nineteendimensionless -deformation parameters.- Ten of these parameters lead tobirefringence and are already tightly constrained by astrophysics. New boundson the remaining nine nonbirefringent parameters can be obtained from theabsence of vacuum Cherenkov radiation for ultrahigh-energy cosmic raysUHECRs. Using selected UHECR events recorded at the Pierre Auger Observatoryand assigning pseudo-random directions i.e., assuming large-scale isotropy,Cherenkov bounds are found at the 10^{-18} level, which improve considerablyupon current laboratory bounds. Future UHECR observations may reduce theseCherenkov bounds to the 10^{-23} level. An Addendum with two-sided bounds hasbeen published separately Phys. Rev. D 77, 117901 2008, arXiv:0806.4351.



Autor: F.R. Klinkhamer, M. Risse

Fuente: https://arxiv.org/







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