Theoretical studies of topological phases of matter
NISSAY Lecture Hall, the University of Tokyo (Komaba campus), Japan

December 1-December 5, 2025

Monday, December 1
9:45-10:45 Kapustin Higher-form symmetries on a lattice and homotopy theory
11:00-12:00 Kubota Stable homotopy theory of invertible quantum spin systems I
13:30-14:30 Prakash Topological families and terminating transitions
14:45-15:45 Shiozaki Matrix product state framework for quantum spin chains with symmetry actions on parameter space
16:00-17:00 Wang 1+1D Deconfined Quantum Critical Points and the Dual Non-Anomalous Non-Invertible Symmetries
Tuesday, December 2
9:45-10:45 Gu Classification and construction of crystalline topological superconductors and insulators in interacting fermion systems
11:00-12:00 Pflaum Homotopical Study of C*-Algebraic Quantum Spin Systems
13:30-14:30 Kawagoe Levin-Wen is a gauge theory: Entanglement from topology
14:45-15:45 Krulewski Free and Interacting Fermionic SPTs and the Bott Spiral
16:00-17:00 Ohyama Generalized Cluster States and Strip 2-Algebras
Wednesday, December 3
9:45-10:45 Rychkov Some rigorous results about the tensor network renormalization group for 2D statistical physics models
11:00-12:00 Kubota Stable homotopy theory of invertible quantum spin systems II
Thursday, December 4
9:45-10:45 Delcamp Entanglement, gapped phases and algebras of order parameters for non-invertible symmetries
11:00-12:00 Grady Deformation classes of invertible field theories and the Freed-Hopkins conjecture
13:30-14:30 Qi The Symmetry Taco: a bulk-boundary correspondence for mixed-state phases
14:45-15:45 Stehouwer From TQFT to topological order: a view on unitarity
16:00-17:00 Wen Higher Berry phase and boundary conformal field theories
Friday, December 5
9:45-10:45 Yamashita A merger of elliptic cohomology and global categorical symmetries
11:00-12:00 Kubota Stable homotopy theory of invertible quantum spin systems III
13:30-14:30 Williamson Universal fault tolerant quantum computation in 2D without getting tied in knots
14:45-15:45 Yu How to Build Anomalous (3+1)d TQFTs