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Title:
Anomalies without gauge invariance
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Abstract:
We revisit the question of the predictability of the S-matrix program, i.e. how much constraint can one put on a theory by solely requiring unitarity and locality of the S-matrix without ever going off-shell, or equivalently, introducing redundant gauge symmetries. Using generalized unitarity, we will demonstrate that locality automatically forces upon us the usual anomaly conditions in four dimensions for theories with chiral fermions. In higher (even) dimensions, the same analysis reveals the presence of a new particle in the spectrum: the Green-Schwarz two-form.
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