Speaker: Hongliang Jiang (SIMIS, Fudan)
Time: 2025-09-24 16:00:00
Venue: R1710
Zoom Meeting ID: 886 7794 9969 (Passcode: 523825)
Abstracts:
Three-dimensional N=4 superconformal field theories (SCFTs) admit a special class of deformations known as universal mass deformations, which originate from the stress tensor multiplet and therefore exist in all 3d N=4 SCFTs. It has been argued that such deformations modify the supersymmetry algebra and lead to fully gapped theories in the infrared. We study the universal mass deformation of general abelian 3d N=4 SCFTs and argue that the resulting low-energy theory is described by an abelian topological quantum field theory (TQFT). Furthermore, we show that two abelian 3d N=4 SCFTs related by mirror symmetry flow to TQFTs that are connected via a generalized notion of level-rank duality. In the special case of self-mirror symmetric SCFTs, the resulting TQFT is shown to be time-reversal invariant. Since the universal mass deformation is expected to preserve global symmetries and anomalies, we explicitly demonstrate ‘t Hooft anomaly matching in the case of supersymmetric QED.
Introduction to the speaker: Hongliang Jiang is an Associate Professor, jointly appointed by SIMIS and Fudan University since July 2025. Prior to moving to Shanghai he held postdoctoral positions at the University of Bern, Queen Mary University of London, and Imperial College London. He obtained his Ph.D. from the Hong Kong University of Science and Technology in 2018. His research interest ranges between different subsectors of Theoretical and Mathematical Physics. Most recently focusing on strongly-coupled QFTs by means of SUSY, conformal symmetry, generalised symmetries, as well as furthering the understanding of quantum gravity through the lens of the holographic principle.
English 
简体中文