Super p-brane theories and new spacetime superalgebras

We present a geometric formulation of super p-brane theories in which the Wess-Zumino term is (p + 1)-th order in the supersymmetric currents, and hence is manifestly supersymmetric. The currents are constructed using a supergroup manifold corresponding to a generalization of a superalgebra which we found sometime ago. Our results generalize Siegelʹs analogous reformulation of the Green-Schwarz superstring. The new superalgebras we construct underly the free differential superalgebras introduced by de Azcárraga and Townsend a few years ago.