New advancements on defects and their applications

Mahesh Balasubramanian: Topological surface defects in 2+1d, and gauging of non-invertible symmetries

Jul 15, 2025, 3:30 PM

20m

Panasonic Auditorium, Yukawa Hall (Yukawa Institute for Theoretical Physics, Kyoto University)

Description

We describe non-invertible symmetries of 2+1d TQFTs and their twisted sectors in terms of connected fusion 2-categories. We rephrase these objects in the familiar language of QFT whenever possible, and for 2+1d Z_{2} gauge theory, we describe gauging of these non-invertible symmetries and their inversion using Anyon condensation.