Geometry and Quantum Theory seminar 2025-2026.

Geometry and Quantum Theory (GQT seminar) Spring 2026.

Time: 4:15-6:15 pm, Tuesdays, at Science Center (1 Oxford St), 507.

The first topic we will cover is the paper Stable homotopy theory of invertible gapped quantum spin systems I: Kitaev's Omega-spectrum (2025) by Yosuke Kubota (with talks by Daniel Spiegel, Dan Freed, and Bowen Yang).

We will then hear from Sanjay Raman, who will discuss the paper Solitonic symmetry as non-invertible symmetry: cohomology theories with TQFT coefficients (2023) by Shi Chen and Yuya Tanizaki. See below for a list of other suggested topics.

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Schedule:

1/27: Daniel Spiegel.

2/3: Bowen Yang and Dan Freed.

2/10: no meeting.

2/17: Saman Habibi Esfahani.

2/19: William Stewart.

2/24: Max Hubner.

3/3: Sanjay Raman.

Other suggested topics:

A-infinity categories (suggested by Ahsan Khan and Sunghyuk Park)

Tudor Dimofte, Wenjun Niu, Victor Py, Line Operators in 3d Holomorphic QFT: Meromorphic Tensor Categories and dg-Shifted Yangians (2025) (suggested by Vasily Krylov)

Katherine A. Maxwell, Alexander A. Voronov, Toward the Universal Mumford form on Sato Grassmannians (2024) (suggested by Oswaldo Vazquez)

Edward Witten, Instantons and the Large N=4 Algebra (2024) (suggested by Saman Esfahani and Max Hubner)

Roland Bittleston, Kevin Costello, The One-Loop QCD \beta-Function as an Index (2025) (suggested by Ahsan Khan)

Please email Vasily Krylov (vkrylov[at]math.harvard.edu) if you would like to suggest a topic or are interested in speaking on one of the topics listed above.

Geometry and Quantum Theory (GQT seminar) Fall 2025.

Time: 4:15-6:30 pm, Tuesdays, at Science Center (1 Oxford St), 507.

Organized by Dan Freed, Vasily Krylov.

For the first four or so meetings the first hour will be a talk by a new postdoc or visitor who intends to participate in the seminar. The second hour will be a more informal session in which people give brief reports on news from the summer, either new developments you learned about, a new result of yours, a new perspective, a new open problem. These informal reports can be 15-30 minutes, depending on what's needed. After those meetings we'll settle in to learning in depth about a relatively recent paper, book, or about some topic.

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Schedule:

9/2: Saman Habibi Esfahani (60 min); Dan Freed (30 min).

9/9: Lorenzo Riva (60 min); Vasily Krylov (30 min).

9/16: no meeting.

9/23: no meeting.

9/30: Max Hubner (60 min); Bowen Yang (30 min).

10/7: Daniel Spiegel (60 min), Sunghyuk Park (30 min).

10/14: Dylan Galt (60 min), Keyou Zeng (30 min).

10/21: no meeting.

10/28: Elliott Gesteau (60 min), Sanjay Raman (30 min).

11/4: Dan Freed (60 min).