Minimal extensions of symmetric fusion categories and Witt groups

Time:    13:30-15:00    2022/11/15

Zoom:    559 700 6085 （PW: BIMSA）

Abtract：

Groups of minimal extensions of symmetric fusion categories were introduced by Lan, Kong, and Wen to study symmetry protected topological phases of matter.  We describe how these groups  are related to categorical Witt groups and how to compute them using a categorical analogue of the Kunneth formula in group cohomology.