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In a previous article [arXiv:1011.4258], we established the consistency ofisotropic modified Maxwell theory for a finite range of the Lorentz-violatingparameter \tilde{kappa}_{tr}, which includes both positive and negative valuesof \tilde{kappa}_{tr}. As an aside, we mentioned the existence of a physicalmodel which, for low-energy photons, gives rise to isotropic modified Maxwelltheory with a positive parameter \tilde{kappa}_{tr} (corresponding to a "slow"photon). Here, we present a related model which gives rise to isotropicmodified Maxwell theory with a negative parameter \tilde{kappa}_{tr}(corresponding to a "fast" photon). Both models have an identical particlecontent, photon and Dirac particles, but differ in the type of spacetimemanifold considered.

Models for low-energy Lorentz violation in the photon sector: Addendum to 'Consistency of isotropic modified Maxwell theory'