BEGIN:VCALENDAR VERSION:2.0 PRODID:researchseminars.org CALSCALE:GREGORIAN X-WR-CALNAME:researchseminars.org BEGIN:VEVENT SUMMARY:Xingyang Yu (Virginia Tech) DTSTART:20250619T130000Z DTEND:20250619T140000Z DTSTAMP:20260423T040114Z UID:QTFMS/6 DESCRIPTION:Title: No n-invertible Symmetries via Subfactors: Conformal and Topological Applicat ions\nby Xingyang Yu (Virginia Tech) as part of Quantum Theories of Fi elds\, Matter\, and Strings\n\n\nAbstract\nNon-invertible symmetries\, cha racterized by fusion categories rather than groups\, play a central role i n modern quantum field theory and topological phases of matter. In this ta lk\, I will introduce a von Neumann subfactor approach to non-invertible s ymmetries in two dimensions. Subfactors encode fusion categorical data—i ncluding symmetries\, module categories\, and dual symmetries—via their bipartite principal graphs. I will explain how these structures naturally encode generalized gaugings and dualities\, and illustrate their physical implications in both conformal and topological settings. In particular\, I will discuss new self-dualities in $c=1$ CFTs\, such as the exceptional o rbifold $SU(2)_1/A_5$\, and present a classification of particle-soliton d egeneracies in gapped phases with various non-invertible symmetries. This framework provides a concrete computational toolkit that bridges subfactor theory and physical non-invertible symmetries.\n LOCATION:https://researchseminars.org/talk/QTFMS/6/ END:VEVENT END:VCALENDAR