Abstracts
for the Seminar

Fall 2022

**Speaker: **Laura Escobar, Washington University

**Title: **Determining the complexity of Kazhdan-Lusztig varieties

**Time:** 2:30 PM, Monday, September 26, 2022

**Place:** Malott 206

**Abstract:** We introduce Kazhdan-Lusztig varieties are defined by ideals generated by certain minors of a matrix, which are chosen by a combinatorial rule. The structure of these varieties can be understood from the combinatorics of permutations. Each Kazhdan-Lusztig variety has a natural torus action from which one can construct a polytope. The complexity of this torus action can be computed from the dimension of the polytope and, in some sense, indicates how close the geometry of the variety is to the combinatorics of the associated polytope. In joint work with Maria Donten-Bury and Irem Portakal we address the problem of classifying which Kazhdan-Lusztig varieties have a given complexity utilizing the rich combinatorics of these varieties.

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