Abstract
The authors determine the super-spin and internal symmetry Casimirs for the four-dimensional global extended supersymmetry algebra with central charges, for both the non-degenerate and degenerate case ('spin-reducing'), and show how these two cases are related. The nature of the off-shell symmetries and representations on superfields are analysed. The 'super-tableau calculus' is extended to the central charge case, and the constraints on superfields required to produce the fundamental irrep, and others are determined (for even N); prepotentials are discovered for N=2.
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