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Résumé |
In this talk, I revisit gauge anomalies from a purely on-shell perspective. I will
argue that a failure of anomaly cancellation manifests itself as a breakdown of
collinear factorization in scattering amplitudes. Focusing on one-loop five-point
amplitudes with graviton exchange, I will show that anomalous theories exhibit
singular behavior in collinear limits that cannot be reconciled with standard
factorization theorems. From this viewpoint, gravity emerges as a universal and
on-shell probe of both abelian and non-abelian gauge anomalies. |
