Bootstrapping on-shell quantum anomalies

par Remy Larue

jeudi 9 juil. 2026, 11:00 → 12:00 Europe/Paris

Auditorium Vivargent (LAPTh)

We explain how quantum anomalies can be bootstrapped using on-shell techniques. Starting from anomalous Ward identities, we construct the most general 3-point form factors for various types of anomalies consistent with (residual) gauge symmetries, discrete symmetries, and Bose symmetry. Our bootstrap reproduces the known gauge and gravitational anomalies, including the mixed sectors. In particular, we recover gauge-anomaly cancellation conditions, as well as find that the Weyl anomaly should not involve Pontryagin densities, which has been subject of debate for a decade. Our results prove that anomalies, like amplitudes, admit a description in terms of consistency rather than explicit loop calculations and details of the microscopic theory.