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The goldstino is the Nambu-Goldstone fermion emerging in the spontaneous breaking of supersymmetry. It is the close fermionic analog of the Nambu−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 small explicit supersymmetry breakdown involved, on top of the basic spontaneous breakdown, in which case it develops a ''small'' mass−−see Pseudo-Goldstone boson. In theories where supersymmetry is a global symmetry, the goldstino is an ordinary particle (possibly the lightest supersymmetric particle, responsible for dark matter). In theories where supersymmetry is a local symmetry, the goldstino is absorbed by the gravitino, the gauge field it couples to, becoming its longitudinal component, and giving it nonvanishing mass. This mechanism is a close analog of the way the Higgs field gives nonzero mass to the W and Z bosons. Vestigial bosonic superpartners of the goldstinos, called ''sgoldstinos'', might also appear, but need not, as supermultiplets have been reduced to arrays. In effect, SSB of supersymmetry, by definition, implies a nonlinear realization of the supersymmetry in the Nambu-Goldstone mode, in which the goldstino couples ''identically to all particles'' in these arrays, and is thus the superpartner of ''all of them'', equally. == References == 〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Goldstino」の詳細全文を読む スポンサード リンク
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