Speaker: Takefumi Nosaka (Tokyo Institute of Technology)
Date and time: Tuesday, October 23, 5:15--6:30pm
Place: Gelman Library, room 608
Title: "Dijkgraaf-Witten invariants and Pachner moves"
Abstract: As a topological toy-model of the Chern-Simons invariant, Dijkgraaf and Witten suggested an invariant of 3-manifolds defined in a simple way. However, the computation is seemingly not so easy if done from definition. In this talk, I explain the definition and mention some technical difficulties. After that, I introduce some methods to compute the invariant. I will mention M. Wakui approach using Pachner moves on 3-manifolds