U. Haifa Topology & Geometry seminar: Wednesday, June 18, 2012. Speaker: Joost Nuiten (Toulouse). Title: “The infinitesimal tangle hypothesis”.
The tangle hypothesis is a variant of the cobordism hypothesis that considers cobordisms embedded in some finite-dimensional Euclidean space (together with framings). Such tangles of codimension k can be organized into an E_k-monoidal d-category, where d is the maximal dimension of the tangles. The tangle hypothesis then asserts that this category of tangles is the free E_k-monoidal d-category with duals generated by a single object.
In this talk, based on joint work in progress with Yonatan Harpaz, I will describe an infinitesimal version of the tangle hypothesis: Instead of showing that the E_k-monoidal category of tangles is freely generated by an object, we show that its cotangent complex is free of rank 1. This provides support for the tangle hypothesis (of which it is a direct consequence), but can also be used to reduce the tangle hypothesis to a statement at the level of E_k-monoidal (d+1, d)-categories by means of obstruction theory.
Recording:
