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October 23, 2024
Wednesday, October 23
Geometry and Topology
Time: 15:30
Speaker: Tao Gong (Western)
Title: "Homotopy Types of Quotients of Toric varieties from Weyl Groups"
Room: MC 107

Abstract: Given a reduced crystallographic root system with a fixed simple system, it is associated to a Weyl group $W$ and a polytope $P$ which is the convex hull of the $W$-orbit of a dominant weight. $P$ and $P/W$ are polytopes, associated with complex toric varieties $X_P$ and $X_{P/W}$ respectively. We will see a homotopy equivalence between $X_P/W$ and $X_{P/W}$, and contractibility of the real real points $X_{P}^{\mathbb{R}}/W$ for small ranks.