From Linear to Non-linear SUSY and Back Again
Abstract
We show that couplings of the goldstino field, appearing when global supersymmetry is broken, can always be described in superspace by means of a nilpotent chiral superfield X, satisfying X2=0. This applies to both F-term and D-term supersymmetry breaking, even when the supersymmetry breaking model admits a linear description.
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