Gauge anomalies in U(1) theory show up as Stokes-surface dependence in a manifestly gauge-invariant field-strength formalism, and the axial anomaly for dyons with a theta term is derived.
An Introduction to the Worldline Technique for Quantum Field Theory Calculations
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These two lectures give a pedagogical introduction to the ``string-inspired'' worldline technique for perturbative calculations in quantum field theory. This includes an overview over the present range of its applications. Several examples are calculated in detail, up to the three-loop level. The emphasis is on photon scattering in quantum electrodynamics.
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Geometrizing the Anomaly
Gauge anomalies in U(1) theory show up as Stokes-surface dependence in a manifestly gauge-invariant field-strength formalism, and the axial anomaly for dyons with a theta term is derived.