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What is a homotopy coherent SO(3) action on a 3-groupoid?

[Moved Online] Tensor categories and topological quantum field theories March 16, 2020 - March 20, 2020

March 16, 2020 (09:30 AM PDT - 10:30 AM PDT)
Speaker(s): Noah Snyder (Indiana University)
  • Topological quantum field theories

  • homotopy coherent actions

  • homotopy fixed points

  • higher category theory

Primary Mathematics Subject Classification
Secondary Mathematics Subject Classification



One consequence of the cobordism hypothesis is that there's a homotopy coherent action of O(n) on the space of fully dualizable objects in a symmetric monoidal n-category. But what does this mean concretely? For example, by joint work with Douglas and Schommer-Pries there's an O(3) action on the 3-groupoid of fusion categories, but how do you turn this abstract action into a concrete collection of statements about fusion categories? In this talk, I will explain joint work in progress with Douglas and Schommer-Pries answering this question by saying such an action is given by four explicit pieces of data. If time permits I will also discuss homotopy fixed points for SO(3) actions, and explain the relationship between homotopy fixed points and spherical structures on fusion categories.

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