# From Linear to Non-linear SUSY and Back Again

## TL;DR

This paper demonstrates that goldstino couplings in broken supersymmetry can always be represented using a nilpotent chiral superfield in superspace, unifying linear and non-linear SUSY descriptions.

## Contribution

It establishes a universal superspace formulation for goldstino couplings applicable to both F-term and D-term SUSY breaking, regardless of linearity.

## Key findings

- Goldstino couplings can be described by a nilpotent superfield X with X^2=0
- The formulation applies to both F-term and D-term SUSY breaking
- Unifies linear and non-linear supersymmetry descriptions

## 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 $X^2=0$. This applies to both F-term and D-term supersymmetry breaking, even when the supersymmetry breaking model admits a linear description.