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2015

Comments on the nilpotent constraint of the goldstino superfield

Ghilencea, D. M.

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Superfield constraints were often used in the past, in particular to describe the Akulov-Volkov action of the goldstino by a superfield formulation with $L=(\Phi^\dagger \Phi)_D + [(f\Phi)_F + h.c.]$ endowed with the nilpotent constraint $\Phi^2=0$ for the goldstino superfield ($\Phi$).

Inspired by this, such constraint is often used to define the goldstino superfield even in the presence of additional superfields, for example in models of "nilpotent inflation".
In this review we show that the nilpotent property is not valid in general, under the assumption of a microscopic (ultraviolet) description of the theory with linear supermultiplets.
Sometimes only weaker versions of the nilpotent relation are true such as $\Phi^3=0$ or $\Phi^4=0$ ($\Phi^2\not=0$) in the infrared (far below the UV scale) under the further requirement of decoupling all additional scalars (coupling to sgoldstino), something not always possible (e.g.

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