Goldstino

The goldstino is the Nambu-Goldstone fermion emerging in the spontaneous breaking of supersymmetry. It is the close analog of the Goldstone boson controlling the spontaneous breakdown of ordinary bosonic symmetry. As in the case of Goldstone bosons, it is massless, unless there is also a little explicit supersymmetry breakdown on top of spontaneous breakdown, in which case it develops a small mass.