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We find the dual equivalent (gauge invariant) version of the Maxwell theoryin D=4 with a Proca-like mass term by using the symplectic embedding method.The dual theory obtained (Maxwell-Podolsky) includes a higher-order derivativeterm and preserve the gauge symmetry. We also furnish an investigation of thepole structure of the vector propagator by the residue matrix which considersthe eventual existence of the negative-norm of the theory.

Duality considerations about the Maxwell-Podolsky theory through the symplectic embedding formalism and spectrum analysis