Superspace Actions and Duality Transformations forN= 2 Tensor Multiplets

General actions for self-interacting N = 2 tensor multiplets are considered in the harmonic superspace approach. All of them are shown to be equivalent, by superfield duality transformations, to some restricted class of the hypermultiplets actions. In particular, the improved tensor multiplet theory is dual to a free hypermultiplet one. We present also superspace couplings of these matter multiplets to conformal supergravity.

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