A modern point of view on anomalies

We review the concept of anomaly field theory, namely the fact that the anomalies of a d‐dimensional field theory can be encoded in a d + 1‐dimensional field theory functor. We give numerous examples of anomaly field theories, explain how classical facts about anomalies are recovered from the anomaly field theory, and review recent work on global anomaly cancellation in 6d supergravity where this concept was instrumental. We also sketch the status of global anomaly cancellation checks in string theory. This paper is based on a talk given at the Durham Symposium 'Higher Structures in M‐theory' in August 2018. (© 2019 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)