Workshop
18 May, 2026 - 19 Jun, 2026
All known quantum and statistical systems support defects and extended excitations, which are both described by extended operators in quantum field theory. Examples are Wilson loops and their higher-dimensional generalizations. Extended excitations are instrumental in characterizing the phases and dynamics of physical systems: for example, Wilson lines in the confinement-deconfinement transition, and boundaries/interfaces in topological phases of matter. They also implement generalized symmetries, whose recent paradigm-shifting discovery has already found many applications, ranging from condensed matter systems to statistical models and four-dimensional gauge theories.
Defects are physically interesting observables in many contexts. For instance, defects describe boundaries and impurities in materials at criticality (modeled by Wilson and 't Hooft lines of heavy probe particles). Furthermore, many information-theoretic quantities map directly to defect observables, such as in the calculation of entanglement entropy and in the description of measurement protocols.
The growing interest in defects and extended excitations, their generalized symmetries, inner dynamics, and diverse applications is evidenced by a large number of recent works. Several research groups, in high-energy, condensed matter, and statistical physics, each employing distinct methods and terminologies, share common interests in these topics. The goal of this GGI activity is to bring together theoretical physicists working on extended operators in different domains, to foster cross-disciplinary collaborations.
- generalized symmetries and higher categorical structures
- defect dynamics
- phases of gauge theories
- defects on the lattice and exact results
- defects and quantum information
Andrea Cappelli (INFN Firenze),
Gabriel Cuomo (SISSA),
Zohar Komargodski (Stony Brook Univ),
Max Metlitski (MIT),
Adam Nahum (ENS Paris),
Hubert Saleur (IPhT Saclay),
Sakura Schafer-Nameki (Oxford Univ)
Andrea Cappelli, Gabriel Cuomo
The participants who would like to present a poster are kindly invited to send an email with the title and a short abstract to alice.bernamonti@unifuit before May 22, specifying for which week of the workshop. Since a limited number of panels is available, the organizers will select the posters shortly after the deadline.
week 3
| Monday | Tuesday | Wednesday | Thursday | Friday | |
|---|---|---|---|---|---|
| 11:30 - 12:30 | Tomasevic | Newenfeld | Collin-Ellerin | Caceres | |
| 13:00 - 14:30 | lunch | lunch | lunch | lunch | lunch |
| 14:30 - 15:30 | Sorce | Emparan |
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| Date | Speaker | Title | Type | Useful Links |
|---|---|---|---|---|
| 18 May, 2026 - 14:30-15:30 | Lorenzo Bianchi | Analytic bootstrap for holographic surface defect | Talk |
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| 18 May, 2026 - 15:30-16:30 | Philine Van Vliet | Sum rules for conformal defect data | Talk |
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| 19 May, 2026 - 11:00-12:00 | Ryan Lanzetta | Unitarity bounds on cusp anomalous dimension | Talk |
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| 19 May, 2026 - 12:00-13:00 | Christian Copetti | When symmetries twist: anomaly inflow on monodromy defects | Talk |
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| 19 May, 2026 - 14:30-14:45 | Jeremias Aguilera-Damia | Confining flux tubes in a gapless phase (part 1) | Talk |
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| 19 May, 2026 - 14:45-15:00 | Giovanni Rizi | Confining flux tubes in a gapless phase (part 2) | Talk |
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| 19 May, 2026 - 15:30-15:45 | Raquel Izquierdo Garcia | Higher Dimensional Holography | Talk |
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| 19 May, 2026 - 15:45-16:00 | Riccardo Villa | Gauging in superconductors and other electronic systems | Talk |
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| 19 May, 2026 - 16:00-16:15 | Stathis Vitouladitis | The state/defect correspondence | Talk |
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| 20 May, 2026 - 11:00-13:00 | Masaki Oshikawa | Review talk | Talk |
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| 21 May, 2026 - 11:00-12:00 | Pavel Putrov | TQFT from the ground state | Talk |
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| 21 May, 2026 - 12:00-13:00 | Ingo Runkel | Extensions of topological symmetries | Talk |
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| 22 May, 2026 - 11:00-12:00 | Riccardo Argurio | Defects, flat gauging, T-duality: at any radius, in the continuum and on the lattice. | Talk |
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| 22 May, 2026 - 12:00-13:00 | Hidenori Fukaya | Curved defects and induced gravity | Talk |
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| 25 May, 2026 - 11:00-12:00 | Shu-Heng Shao | Lattice chiral symmetry from bosons in 3+1d | Talk |
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| 25 May, 2026 - 12:00-13:00 | Paul Fendley | Exact CFT results from the lattice | Talk |
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| 26 May, 2026 - 11:00-12:00 | Fei Yan | Integrability and topological defects in (1+1)-d quantum spin chains | Talk |
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| 26 May, 2026 - 12:00-13:00 | Michele Del Zotto | TQFT from the groundstate (continued) | Talk |
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| 26 May, 2026 - 14:30-14:50 | Andrea Antinucci | Field theories for (non-Abelian) anyon condensation transitions | Talk |
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| 26 May, 2026 - 14:50-15:10 | Federico Ambrosino | Charge conjugation symmetry and Monodromy defects in Chern-Simons theory | Talk |
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| 26 May, 2026 - 15:10-15:30 | Rodrigo Arouca | Hall Conductance in a weakly time-reversal invariant open system | Talk |
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| 26 May, 2026 - 15:50-16:10 | Giovanni Galati | Scattering off defects, and transmitting what I have understood. | Talk |
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| 26 May, 2026 - 16:10-16:30 | Han Ma | Z2 gauge structure in the generalized Kitaev honeycomb models | Talk |
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| 27 May, 2026 - 11:00-12:00 | Frank Verstraete | Perfect Particle Transmission through Duality Defects | Talk |
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| 27 May, 2026 - 12:00-13:00 | Po-Shen Hsin | Explore entropic orders in quantum lattice models | Talk |
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| 28 May, 2026 - 11:00-12:00 | Xiao-Gang Wen | Statistics for Elementary Excitations of Mixed Dimensionalities | Talk |
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| 28 May, 2026 - 12:00-13:00 | Lukas Fidkowski | Chiral Lattice gauge theories from symmetry disentanglers | Talk |
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| 29 May, 2026 - 11:00-12:00 | Yifan Wang | Extraordinary Surface Criticalities for Interacting Fermions | Talk |
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| 29 May, 2026 - 12:00-13:00 | Luisa Eck | Non-invertible symmetry enriched topological orders | Talk |
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| 01 Jun, 2026 - 11:00-13:00 | Yin-Chen He | Fuzzy sphere for conformal defects | Talk |
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| 03 Jun, 2026 - 11:00-13:00 | Sakura Schafer-Nameki | Pedagogical Introduction to the SymTFT and Applications | Talk |
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| 03 Jun, 2026 - 14:30-14:50 | Lea Bottini | Topological order enriched by non-invertible symmetry via anyon condensation | Talk |
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| 03 Jun, 2026 - 14:50-15:10 | Nayan Myerson-Jain | Rényi defect criticality and entropy in (2+1)d QCPs | Talk |
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| 03 Jun, 2026 - 15:40-16:00 | Pierluigi Niro | From QED_3 to the multicritical point of the Fradkin-Shenker model | Talk |
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| 03 Jun, 2026 - 16:00-16:20 | Abhinav Prem | Intrinsically Mixed-State Topological Order | Talk |
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| 04 Jun, 2026 - 11:00-12:00 | Ryohei Kobayashi | Automorphism in gauge theory and Clifford-hierarchy stabilizer codes | Talk |
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| 04 Jun, 2026 - 12:00-13:00 | Hubert Saleur | O(3) sigma model, XXX spin chains and t’Hooft anomalies | Talk |
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| 05 Jun, 2026 - 11:00-12:00 | Ilya Gruzberg | Multifractals at Anderson transitions and the Coulomb gas: a (b)CFT perspective | Talk |
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| 08 Jun, 2026 - 11:00-12:00 | Cenke Xu | Symmetry origin of the quantum-classical transition, hydrodynamics, and decodability. | Talk |
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| 08 Jun, 2026 - 12:00-13:00 | Yunqin Zheng | On the absence of symmetric conformal boundary conditions | Talk |
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| 09 Jun, 2026 - 11:00-12:00 | Anton Kapustin | Higher symmetries and homotopy theory in quantum lattice models | Talk |
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| 09 Jun, 2026 - 12:00-13:00 | Sergej Moroz | Spontaneously Broken Non-Invertible Symmetries in Transverse-Field Ising Qudit Chains | Talk |
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| 09 Jun, 2026 - 14:30-14:45 | Giuseppe Policastro | Holographic generalized conformal junctions | Talk |
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| 09 Jun, 2026 - 14:45-15:00 | Arkya Chatterjee | More (about) non-invertible symmetries in the 4-state Potts model | Talk |
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| 09 Jun, 2026 - 15:00-15:15 | Apoorv Tiwari | Universal quantum computation with group surface codes | Talk |
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| 09 Jun, 2026 - 15:45-16:00 | Anatoly Konechny | RG flows of chiral defects from fusing relations | Talk |
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| 09 Jun, 2026 - 16:00-16:15 | Luigi Tizzano | Soft Theorems and Null Cusps from Line Defects | Talk |
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| 09 Jun, 2026 - 16:15-16:30 | Rajath Radhakrishnan | Dimensional reduction of topological operators | Talk |
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| 10 Jun, 2026 - 11:00-13:00 | Nat Tantivasadakarn | Symmetries on the lattice | Talk |
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| 11 Jun, 2026 - 11:00-12:00 | Sara Murciano | Measurement-altered criticality beyond forced outcomes | Talk |
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| 11 Jun, 2026 - 12:00-13:00 | Ibrahima Bah | Aspects of locality, unitarity, and symmetries | Talk |
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| 12 Jun, 2026 - 11:00-12:00 | Xinping Yang | Microscopic structure of categorical duality operators | Talk |
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| 12 Jun, 2026 - 12:00-13:00 | Salvatore Pace | Comments on Clifford QCA symmetries | Talk |
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| 15 Jun, 2026 - 11:00-12:00 | Charlotte Kristjansen | Black Holes and Integrable Boundary States in Quantum Spin Chains | Talk |
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| 15 Jun, 2026 - 12:00-13:00 | Fabio Apruzzi | Holographic Defects: From Strings to Punctures | Talk |
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| 16 Jun, 2026 - 11:00-12:00 | Chris Herzog | Scattering Off Chamblin-Reall Branes | Talk |
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| 16 Jun, 2026 - 12:00-13:00 | Francesco Parisen Toldin | Extraordinary transition at the edge of a correlated topological insulator | Talk |
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| 16 Jun, 2026 - 14:30-14:50 | Bernardo Zan | Quantum group symmetry and non-local operators | Talk |
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| 16 Jun, 2026 - 14:50-15:10 | Alison Warman | Twin Phases: Phase Transitions Without Hidden Symmetry Breaking | Talk |
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| 16 Jun, 2026 - 15:10-15:30 | Giuseppe Di Giulio | Local Quench from a Krylov Perspective | Talk |
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| 16 Jun, 2026 - 15:30-15:50 | Francesco Galvagno | Exact results for bulk integrated correlators with line defects | Talk |
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| 16 Jun, 2026 - 15:50-16:10 | Matthew Roberts | Magnetic defects and new RG monotones | Talk |
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| 16 Jun, 2026 - 16:10-16:30 | Zimo Sun | Extraordinary Surface Criticalities for Interacting Fermions II | Talk |
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| 17 Jun, 2026 - 11:00-12:00 | Francesco Benini | Quantum-information methods to quantify symmetry breaking | Talk |
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| 17 Jun, 2026 - 12:00-13:00 | Inaki Garcia-Etxebarria | Anomaly-induced vanishing of brane partition functions | Talk |
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| 18 Jun, 2026 - 11:00-12:00 | Marco Meineri | Defects and protected operators at the boundary of AdS | Talk |
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| 18 Jun, 2026 - 12:00-13:00 | Alessandro Vichi | How (not) to confine color: a bootstrap study of Yang Mills in AdS | Talk |
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| 19 Jun, 2026 - 11:00-12:00 | Fiona Burnell | Field theories for subsystem-symmetry protected topological orders | Talk |
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| 19 Jun, 2026 - 12:00-13:00 | Erik Tonni | Entanglement Hamiltonians in the presence of a boundary | Talk |
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