Gauge anomalies on shell and collinear factorization

par Edoardo Alviani (IJCLab)

jeudi 16 avr. 2026, 11:00 → 12:00 Europe/Paris

210/1-114 - Salle des Séminaires (IJCLab)

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.