Abstract
We investigate the zero mode dimensional reduction of Kaluza-Klein unification in the presence of a single brane in the infinite extra dimension. We treat the brane as fixed, not a dynamical object, and do not require orbifold symmetry. It seems that, contrary to the standard Kaluza-Klein models, the four-dimensional (4D) effective action is no longer invariant under U(1) gauge transformations due to the explicit breaking of isometries in the extra dimension by the brane. Surprisingly, however, the linearized perturbation analysis around the RS vacuum shows that the Kaluza-Klein gauge field does possess U(1) gauge symmetry at the linear level. In addition, the graviscalar also behaves differently from the 4D point of view. Some physical implications of our results are also discussed.
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