Ben-Zvi’s Lectures on Topological Field Theory III
Posted by Alexander Hoffnung
together with Orit Davidovich
The following is the third set of notes following the talks of David Ben-Zvi at a workshop on topological field theories, held at Northwestern University in May 2009. This post follows our second post found here. We’ll again give a brief introduction, and then send you over to a PDF file for the full set of notes.
The first lecture considered an example of a -dimensional TFT constructed from a finite group by assigning to the point the category of modules of the group algebra . The second lecture covered categorical versions of the group algebra for a complex reductive group . This was in preparation for a discussion of topological field theories associated to . These require higher categorical constructions, namely, -categories of -module categories assigned to the point.
This lecture focuses on two versions of -module categories: algebraic -categories and smooth -categories. By a result of Ben-Zvi, Francis and Nadler, assigning the -category of algebraic -categories to the point defines a -dimensional TFT. Assigning the -category of smooth -categories to the point only defines a -dimensional TFT. A modified version extends up to -manifolds. This modification is defined by assigning to the point the -category of -mod where is the finite Hecke category. From a physics perspective all of these are part of a -dimensional gauge theory.
Continue reading about lecture 3 here.
Re: Ben-Zvi’s Lectures on Topological Field Theory III
Does “block matrices” on p4 mean “block diagonal matrices”?