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I apologize for the inconsistent formatting below!


Fall 2022:

9/8/2022- Robert Laugwitz, University of Nottingham:

Relative Drinfeld centers and non-semisimple modular tensor categories

9/22/2022- Julia Pevstova, University of Washington:


Representations of a small quantum group via half quantum flag variety.

10/6/2022- Thibault Décoppet, University of Oxford:


The Morita Theory of Fusion 2-Categories


10/20/2022- Sarah Reznikoff, Kansas State University:


Regular ideals and regular inclusions

11/3/2022- Maissam Barkeshli, University of Maryland:


Defects and higher symmetries in (3+1)D topological phases of matter

11/17/2022- TBA

12/1/2022- Hongdi Huang, Rice University (Rescheduled for next semester)


Spring 2022:

1/13/2022- Ying-Hsuan Lin, Harvard: Numerical Evidence for a Haagerup conformal field theory.

1/20/2022- Emily Peters, Loyola University Chicago: Conway's Rational Tangles and the Thompson group.

1/27/2022- Ana Ros Camacho, Cardiff University: On generalizing a tensor equivalence within the Landau-Ginzburg/conformal field theory correspondence

2/3/2022- Kevin Walker, Microsoft Research: Going from n+ε to n+1 in non-semisimple oriented TQFTs.

2/10/2022- Ramona Wolf, ETH Zurich: Computing F-symbols of endomorphism fusion categories.

2/17/2022- Kristin Courtney, University of Münster: Nuclearity and generalized inductive limits.


2/24/2022- Bruno Nachtergaele, University of California, Davis: The stability of gapped phases and automorphic equivalence

3/3/2022- Luca Giorgetti, University of Rome, Tor Vergata: A planar algebraic description of conditional expectations

3/10/2022- Roberto Conti, Sapienza Università di Roma: Symmetries of noncommutative spaces: a guided tour through the Cuntz algebra case


4/7/2022- Bojko Bakalov, North Carolina State University: An operadic approach to vertex algebras and Poisson vertex algebras

4/14/2022- Richard Ng, Louisiana State University: Reconstruction of modular data from representations of SL(2,Z)

4/21/2022- Laura Colmenarejo, North Carolina State University: An insertion algorithm on multiset partitions with applications to diagram algebras

4/28/2022- Shawn Cui, Purdue University: From Three Manifolds to Modular Categories 

5/5/2022- Jamie Vicary, University of Cambridge: Introducing A proof assistant for geometrical higher
category theory




Fall 2021:

8/26/2021- Xiao-Gang Wen, MIT:

Generalized symmetry, local fusion higher category, and their holographic point of view.

9/2/2021- Ingo Runkel, Universität Hamburg:

Defects and orbifolds in Reshetikhin-Turaev TQFTs

9/9/2021- Amanda Young, TU Munich:

A bulk gap in the presence of edge states for a truncated Haldane psueodpotential

9/16/2021- Henry Tucker, UC Riverside:

Frobenius-Schur indicators for quadratic fusion categories and their Drinfel’d centers

9/23/2021- Ben Hayes, University of Virginia:

Property (T) and strong 1-boundedness for von Neumann algebras

9/30/2021- David Jordan, University of Edinburgh:

Higher symmetries in skein theory

10/7/2021- Alexei Davydov, Ohio University:


Moduli spaces of tensor categories

10/14/2021- Pieter Naaijkens, Cardiff University:


Long-range entanglement and the split property

10/21/2021- Dan Freed, University of Texas at Austin:


Boundaries and 3-dimensional topological field theories

10/28/2021- Ellen Kirkman, Wake Forest University:


Reflection Hopf algebras


11/4/2021- Chris Heunen, University of Edinburgh:

Axioms for the category of Hilbert spaces

11/11/2021- No Talk: Veteran's Day (Nicolle González  talk rescheduled for next semester).

11/18/2021- Peter Schauenburg, Université de Bourgogne:

Prime factorization of modular categories

Spring 2021:

1/14/2021- Michael Brannan, Texas A&M University:

Quantum graphs and quantum Cuntz-Krieger algebras.

1/21/2021- No talk this week (rescheduled for 3/4/2021).

1/28/2021- Victor Ostrik, University of Oregon:

Two dimensional topological field theories and partial fractions.

2/4/2021- Georgia Benkart, University of Wisconsin - Madison

Fusion rules for Hopf algebras.

2/11/2021 (TALK AT 2PM US EASTERN)- Xie Chen, California Institute of Technology:

Foliation structure in fracton models.

2/18/2021- Theo Johnson-Freyd, Dalhousie University/Perimeter Institute:


Condensations and Components.


2/25/2021- Noah Snyder, Indiana University, Bloomington: 


Demystifying subfactor techniques for constructing tensor categories

3/4/2021- Andy Manion, University of Southern California:

Higher representations and cornered Floer homology.

3/11/2021- No talk this week.

3/18/2021- Zhenghan Wang, University of California Santa Barbara:

Quantum algebras climb the dimension ladder.

3/25/2021- Eric Rowell, Texas A&M University:


Torsion in the Witt group and higher central charges.

4/1/2021- Jacob Bridgeman, Perimeter Institute:

Enriching topological codes: computing with defects.

4/8/2021- Yilong Wang, Louisiana State University: 

Classification of transitive modular categories.

4/15/2021- (Rescheduled to 5/20/2021) 

4/22/2021- Radmila Sazdanovic, North Carolina State University

Bilinear pairings on two-dimensional cobordisms and generalizations of the Deligne category.

4/29/2021- Emily Riehl, Johns Hopkins University:

Elements of ∞-Category Theory.


5/6/2021- Tobias Osborne, Leibniz Universität Hannover: 

Fusion categories and physics: a statistical physics approach.

5/20/2021- Claudia Scheimbauer, Technische Universität München:

Higher Morita categories and extensions.

5/27/2021- Ehud Meir,  University of Aberdeen:

Interpolations of symmetric monoidal categories and algebraic structures via invariant theory.

Fall 2020



8/27/2020- David Reutter, Max Planck Institute: 

Semisimple topological field theories and exotic smooth structures.

9/3/2020- Andrew Schopieray, Pacific Institute for the Mathematical Sciences: 

The importance of norm and trace for fusion categories.

9/10/2020- Pavel Etingof, Massachusetts Institute of Technology: TBA 

New incompressible symmetric tensor categories in positive characteristic.​

9/17/2020- Florencia Orosz Hunziker, University of Colorado, Boulder:

Tensor categories arising from the Virasoro algebra.

9/24/2020- Cain Edie-Michell, Vanderbilt University:

Symmetries of modular categories and quantum subgroups

10/1/2020- André Henriques, University of Oxford: 

Extended chiral CFT and a new kind of anomaly

10/8/2020- Stuart White, University of Oxford:


Simple amenable operator algebras

10/15/2020- Chelsea Walton, Rice University:


Universal Quantum Semigroupoids

10/22/2020- Fiona Burnell, University of Minnesota:

An introduction to fracton order

10/29/2020- Dmitri Nikshych, University of New Hampshire:

Braided module categories

11/5/2020- Guillermo Sanmarco, Universidad Nacional de Córdoba:

Pre-Nichols algebras with finite Gelfand-Kirillov dimension

11/12/2020- Christoph Schweigert, Universität Hamburg: 

Topological field theories with boundaries: from tensor networks to Frobenius-Schur indicators​

11/19/2020- César Galindo, Universidad de los Andes:


Braided Zesting and its applications.

12/3/2020- Colleen Delaney, Indiana University, Bloomington: 

Ribbon zesting can produce modular isotopes.

12/10/2020- Cris Negron, University of North Carolina, Chapel Hill:

Geometries for finite tensor categories.

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