Refined Dijkgraaf-Witten invariant of spin 3-manifold

Date
2023/05/23 Tue 15:00 - 16:30
Room
6号館609号室
Speaker
Serban Matei Mihalache
Affiliation
Tohoku University
Abstract

We give a construction of a state sum invariant of closed spin 3-manifold based on super 3-cocycle (a, ω) and combinatorial representation of spin 3-manifold, where ω is a Z2-valued cocycle and a is a 3-cochain satisfying a 3-cocycle condition with a sign coming from the 2-cocycle ω. The definition of the invariant is similar to the state sum construction of the Dijkgraaf-Witten invariant, except it uses the spin structure to take care of the sign in the 3-cocycle condition. We also give an example of the invariant and see that it is sensitive to the spin structure