A goldstino is the massless spin-one-half mode associated with spontaneously broken global supersymmetry. For F-term breaking, the fermion in a multiplet with nonzero auxiliary field transforms by an inhomogeneous term, . In supergravity, the corresponding mode supplies the longitudinal degrees of freedom of a massive gravitino.
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Goldstino refers to a theoretical field that emerges in certain contexts within particle physics, particularly in supersymmetry. In supersymmetric theories, each particle is associated with a superpartner. When a supersymmetric theory is spontaneously broken, the Goldstone theorem comes into play, leading to the appearance of massless scalar particles called Goldstone bosons. The term "Goldstino" specifically refers to the Goldstone boson associated with the breaking of supersymmetry.