physics, mathematical physics, philosophy of physics
theory (physics), model (physics)
experiment, measurement, computable physics
Axiomatizations
Tools
Structural phenomena
Types of quantum field thories
In May 2011 Graeme Segal gave a series of lectures on the topic of quantum field theory at the Hausdorff Center for Mathematics in Bonn.
Graeme Segal, Three Roles of Quantum Field Theory , Felix Klein Lectures 2011, Bonn (website)
Abstract Quantum field theory has many roles, and the lectures will be about three of them. The primary role is to provide a description of all of fundamental physics when gravity is firmly excluded. A second, at first surprising, role has emerged from string theory, which is a theory of gravitation: it turns out that a two-dimensional field theory can be regarded as a generalized manifold, and in particular can be a model for space-time. Thirdly, quite apart from physics, the concept of a field theory has taken on a new life as an organizing principle in other areas of mathematics - not only in geometry and representation theory, but even in connection with quantum computing.
The three roles can be seen together as aspects of noncommutative geometry, and that will be a central theme of the lectures. The talks will aim to show how powerful the field theory idea is by jumping between a variety of contexts, beginning from the origins of the structure in particle physics, with a little about so-called “Wick rotation”, and then moving towards more pure-mathematical applications to analysis, algebra, and the structure of manifolds.
part I (mp4)
Basics of classical mechanics from an AQFT-point of view: symplectic manifold, Hamiltonian, deformation quantization, C-star algebra, state, Lagrangian, action functional, covariant phase space, correlator, locality of the would-be path integral measure
part II (mp4)
part III (mp4)
part IV (mp4)
part V (mp4)
part VI (mp4)