Torus quotients of Schubert varieties in the Grassmannian G2,n

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Torus quotients of Schubert varieties in the Grassmannian G2,n

Author : Dr Arpita Nayek

Year : 2022

Publisher : Indian National Science Academy

Source Title : Indian Journal of Pure and Applied Mathematics

Document Type :

Abstract

Let G= SL(n, C) , and T be a maximal torus of G, where n is a positive even integer. In this article, we study the GIT quotients of the Schubert varieties in the Grassmannian G2,n. We prove that the GIT quotients of the Richardson varieties in the minimal dimensional Schubert variety admitting stable points in G2,n are projective spaces (see Proposition 3.5 and Proposition 3.6). Further, we prove that the GIT quotients of certain Richardson varieties in G2,n are projective toric varieties. Also, we prove that the GIT quotients of the Schubert varieties in G2,n have at most finite set of singular points. Further, we have computed the exact number of singular points of the GIT quotient of G2,n.