= Supersymmetry transformation
{title2=$\delta=\epsilon Q+\bar\epsilon\bar Q$}
A <supersymmetry transformation> is the infinitesimal action generated by an odd <supercharge>, with constant anticommuting spinor parameter in a global theory. In <superspace> it acts as $\delta\mathcal S=(\epsilon Q+\bar\epsilon\bar Q)\mathcal S$, with possible conventional overall factors of $i$. On the fermion of a <chiral superfield>, the transformation includes $\delta\psi=\sqrt2\epsilon F_{\mathrm{aux}}+i\sqrt2\sigma^\mu\bar\epsilon\,\partial_\mu\phi$. A nonzero vacuum <auxiliary field> therefore gives an inhomogeneous fermion shift, identifying the <Goldstino> direction when global <supersymmetry> is spontaneously broken.
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