Examples of cluster varieties from plabic graphs IV

Abstract: Cluster varieties were introduced by Fock and Goncharov as geometric counterparts of Fomin and Zelevinsky’s cluster algebras. Simply speaking, cluster varieties are algebraic varieties with an atlas of torus charts, whose transition maps are captured by certain combinatorial process called cluster mutations. Many interesting geometric objects turn out to be examples of cluster varieties, and one can then use cluster theoretical techniques to study these geometric objects. In this lecture series, we will discuss various examples of cluster varieties whose combinatorics can be captured by plabic graphs, including Grassmannians and double Bruhat/Bott-Samelson cells of $SL_n$. This lecture series will be complementary to Linhui Shen’s lecture series on cluster theory.

Lecture 4: double Bott-Samelson cells of $SL_n$ and positive braid closures $\newline$ We introduce double Bott-Samelson cells of $SL_n$ as a generalization of double Bruhat cells. We will describe their cluster structures and the connection to positive braid closures.

algebraic geometrycombinatoricsdifferential geometrygeometric topologyquantum algebrarepresentation theorysymplectic geometry

Audience: researchers in the topic

Legendrians, Cluster algebras, and Mirror symmetry

Series comments: Schedule
School: January 4–8, 2021
Conference: January 11–15, 2021