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Lorentz-violating corrections on the hydrogen spectrum induced by a nonminimal coupling
The influence of a Lorentz-violating fixed background on fermions is considered by means of a torsion-free nonminimal coupling. The nonrelativistic regime is assessed and the Lorentz-violating
Aspects of causality and unitarity and comments on vortexlike configurations in an Abelian model with a Lorentz-breaking term
The gauge-invariant Chern-Simons-type Lorentz- and CPT-breaking term is here reassessed and a spin-projector method is adopted to account for the breaking (vector) parameter. Issues like causality,
Remarks on Dirac-like monopoles, Maxwell and Maxwell-Chern-Simons electrodynamics in D=2+1 dimensions
Classical Maxwell and Maxwell-Chern-Simons (MCS) Electrodynamics in (2+1)D are studied in some details. General expressions for the potential and fields are obtained for both models, and some
A note on nonlinear electrodynamics
We explore the physical consequences of a new nonlinear electrodynamics, for which the electric field of a point-like charge is finite at the origin, as in the well-known Born-Infeld electrodynamics.
Classical and tree-level approaches to gravitational deflection in higher-derivative gravity
Among the so-called classical tests of general relativity (GR), light bending has been confirmed with an accuracy that increases as times goes by. Here we study the gravitational deflection of
Upper bounds on the photon mass
The effects of a nonzero photon rest mass can be incorporated into electromagnetism in a simple way using the Proca equations. In this vein, two interesting implications regarding the possible
Lorentz-violating SO(3) model : Discussing unitarity, causality, and 't Hooft-Polyakov monopoles
In this paper, we extend the analysis of the Lorentz-violating Quantum Electrodynamics to the non-Abelian case: an SO(3) Yang-Mills Lagrangian with the addition of the non-Abelian Chern-Simons-type
Electron?electron bound states in parity-preserving QED3
By considering the Higgs mechanism in the framework of a parity-preserving planar quantum electrodynamics, one shows that an attractive electron–electron interaction may come out. The e− − e−