Tsinghua Informal Representation Theory Seminar

Winter semester 2026–7: Perverse Schobers

Organised by: Li Fan and Alyosha Latyntsev

Weekly on Tuesdays 1:00–3:00 PM, Shuangqing Building room B534. Feel free to bring friends, lunch, lots of questions, etc. Constructive heckling strongly encouraged!

Each week we have a talk and an informal review of an interesting paper. Lots of time for discussion. We'll also decide the exact schedule together. You don't have to go to all the talks, but going to a few of the introductory ones helps.

Schedule

DateSpeakerTitleLinks
13 Oct Alyosha Stokes data and perverse sheaves
Li Journal club: categorical Lusztig cycles and weave schobers 2605.22440
20 Oct Li Stable ∞-categories
Alyosha Journal club: Fock–Goncharov math/0311149
27 Oct Li Perverse schobers on a surface
You? Journal club: —
3 Nov Li Perverse t-structures and schobers
— Journal club: Kapranov–Schechtman, shuffle algebras, bisheaves and perverse sheaves 1904.09325
10 Nov Alyosha Exodromy and perverse sheaves. En algebras.
— Journal club: —
17 Nov Alyosha Porta–Teyssier 2211.05004, 2401.12335
— Journal club: —
24 Nov — Sheaves of QCoh-module categories
— Journal club: —
1 Dec — (Around here we'll switch from basics about perverse schobers to rep theory applications)
— Journal club: —
8 Dec ——
—Journal club: —
15 Dec ——
—Journal club: —
5 Jan ——
—Journal club: —
12 Jan ——
—Journal club: —

Plans for the semester

We'll first learn the main techniques people use to study perverse schobers, then about halfway through will switch to the kind of links with geometric representation theory we'll have seen in the journal club.

Papers we might review: