Abstract:
The study of topological defects in quantum field theory has seen a wealth of activity recently leading to many interesting insights, for example the explicit realisation of non-invertible topological defects in higher dimensional QFTs or the description of the higher algebraic structures inherent in these topological defects.
In this talk, I would like to give a gentle introduction to this topic using the two-dimensional Ising model on the lattice and in the continuum as an example.