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arxiv: 0912.4392 · v2 · submitted 2009-12-22 · ✦ hep-th · hep-ph

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Lorentz and CPT violation in QED revisited: A missing analysis

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classification ✦ hep-th hep-ph
keywords lorentzaxialconstantcouplingtermvectorviolatingalgebraic
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We investigate the breakdown of Lorentz symmetry in QED by a CPT violating interaction term consisting of the coupling of an axial fermion current with a constant vector field $b$, in the framework of algebraic renormalization -- a regularization-independent method. We show, to all orders in perturbation theory, that a CPT-odd and Lorentz violating Chern-Simons-like term, definitively, is not radiatively induced by the axial coupling of the fermions with the constant vector $b$.

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  1. Crystallography, Lorentz violation, and the Standard-Model Extension

    cond-mat.mes-hall 2026-04 unverdicted novelty 6.0

    Crystal point groups parametrize SME Lorentz-violating coefficients in electromagnetic media, turning birefringent and multiferroic crystals into analogs for high-energy symmetry violations.