2013/11/30 by A. Moyotl, H. Novales–Sánchez, H. Novales-Sánchez +2
Medicine · Physics and Astronomy · #Anomalous magnetic dipole moment #Black Holes and Theoretical Physics #CPT symmetry #Gauge theory #Lorentz covariance #Lorentz transformation #Mathematical physics #Muon #Neuroblastoma Research and Treatments #Noncommutative and Quantum Gravity Theories #Particle physics #Photon #Physics #Propagator #Quantum electrodynamics #Quantum mechanics #Theoretical physics #Vertex (graph theory) #Vertex function #hep-ph
paper · pdf · doi:10.1142/s0217751x14501073
published as Int.J.Mod.Phys. A29 (2014) 22, 1450107 · 11 pages, 2 figures, some references added
openalex publication_date 2014/08/21 · arxiv created 2014/09/02 · arxiv updated 2014/09/03 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Lorentz violation emerged from a fundamental description of nature may impact, at low energies, the Maxwell sector, so that contributions from such new physics to the electromagnetic vertex would be induced. Particularly, nonbirefringent CPT-even effects from the electromagnetic sector modified by the Lorentz- and CPT-violating Standard Model Extension alter the structure of the free photon propagator. We calculate Lorentz-violating contributions to the electromagnetic vertex, at the one-loop level, by using a modified photon propagator carrying this sort of effects. We take the photon off shell, and find an expression that involves both isotropic and anisotropic effects of nonbirefringent violation of Lorentz invariance. Our analysis of the one-loop vertex function includes gauge invariance, transformation properties under C, P and T, and tree-level contributions from Lorentz-violating nonrenormalizable interactions. These elements add to previous studies of the one-loop contributions to the electromagnetic vertex in the context of Lorentz violation in the photon sector. Finally, we restrict our analysis to the isotropic case and derive a finite contribution from isotropic Lorentz violation to the anomalous magnetic moment of fermions that coincides with the result already reported in the literature.