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We consider the interaction between a charged scalar boson and theBopp-Podolsky gauge fields. The Bopp-Podolsky (BP) electrodynamics possessesboth massive and massless propagation modes for the photon, while preservinggauge invariance. We obtain the propagator of all fields present in the modelfor the higher-order generalizations of the linear covariant, light-front anddoubly transverse light-front gauges. Although BP's original model is describedby a higher-order derivatives Lagrangian, it is possible to work with anequivalent reduced-order version by means of the introduction of an auxiliaryvector field. We compute the gauge-invariant improved energy-momentum tensorfor the full reduced-order interacting BP model. Besides the more traditionalfront-form view, we also discuss the light-front perspective in both versionsof the model. Within a Lagrangian framework approach we maintain explicitcovariance at all steps and show that the field propagators, as well as theenergy-momentum tensor, can be cast into a light-front closed form usingspecific properties of general coordinate transformations.

Bopp-Podolsky Scalar Electrodynamics Propagators and Energy-Momentum Tensor in Covariant and Light-Front Coordinates