Addendum: Ultrahigh-energy cosmic-ray bounds on nonbirefringent modified Maxwell theory

2008/06/26 by F. R. Klinkhamer, Markus Risse, M. Risse · 3 citations
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Noncommutative and Quantum Gravity Theories #hep-ph

paper · pdf · doi:10.1103/physrevd.77.117901

published as Phys.Rev.D77:117901,2008 · 5 pages with revtex4

arxiv created 2008/06/26 · openalex publication_date 2008/06/26 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

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^\ensuremath-18 level, together with an improved one-sided bound on the single isotropic parameter at the 10^\ensuremath-19 level.

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• Aharonov-Bohm-Casher problem with a nonminimal Lorentz-violating coupling
• New two-sided bound on the isotropic Lorentz-violating parameter of modified Maxwell theory
• Electrodynamics with Lorentz-violating operators of arbitrary dimension