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We employ a Kaluza-Klein dimensional reduction process on the action of theantisymmetric tensor field in five-dimensional space-time. The result is ajoint field theory of four-dimensional antisymmetric and vector fields. Wewrite the inhomogeneous Euler-Lagrange equations and homogeneous Bianchiidentity equations for the four dimensional field strengths. In these equationsthe terms that couple the field strengths depend on their variation with thecompactified fifth variable. We find that the electric charge current isconserved, but in general the source current of the antisymmetric field is not.The action also displays joint gauge invariance. Observing the fields in aparticular Lorentz frame leads to modified Maxwell and antisymmetric fieldequations. For the Maxwell field the antisymmetric field strengths lead tocoupling terms that represent both magnetic charge density and additionalinduced emf.

Compactified Reduction from Five to Four Space-Time Dimensions of the Antisymmetric Tensor Field