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

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dc.creatorKlinkhamer, F. R.
dc.creatorRisse, M.
dc.date2007-09-16
dc.date2008-06-27
dc.date.accessioned2026-07-07T11:37:13Z
dc.date.available2026-07-07T11:37:13Z
dc.descriptionA particularly simple Lorentz-violating modification of the Maxwell theory of photons maintains gauge invariance, CPT, and renormalization. This modified-Maxwell theory, coupled to standard Dirac particles, involves nineteen dimensionless "deformation parameters." Ten of these parameters lead to birefringence and are already tightly constrained by astrophysics. New bounds on the remaining nine nonbirefringent parameters can be obtained from the absence of vacuum Cherenkov radiation for ultrahigh-energy cosmic rays (UHECRs). Using selected UHECR events recorded at the Pierre Auger Observatory and assigning pseudo-random directions (i.e., assuming large-scale isotropy), Cherenkov bounds are found at the 10^{-18} level, which improve considerably upon current laboratory bounds. Future UHECR observations may reduce these Cherenkov bounds to the 10^{-23} level. An Addendum with two-sided bounds has been published separately [Phys. Rev. D 77, 117901 (2008), arXiv:0806.4351].
dc.description16 pages, v6: included reference to a published Addendum
dc.identifierhttps://arxiv.org/abs/0709.2502
dc.identifierhttp://arxiv.org/abs/0709.2502
dc.identifierPhys.Rev.D77:016002,2008
dc.identifierdoi:10.1103/PhysRevD.77.016002
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/199133
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectAstrophysics
dc.subjectHigh Energy Physics - Theory
dc.titleUltrahigh-energy cosmic-ray bounds on nonbirefringent modified-Maxwell theory
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