Polynomial Assignments for Bott-Samelson manifolds

Abstract

Polynomial assignments for a torus $T$-action on a smooth manifold $M$ were introduced by Ginzburg, Guillemin, and Karshon in 1999; they form a module over $\mathbb{S}({\mathfrak{t}}^{\ast })$, the algebra of polynomial functions on $\mathfrak{t}$, the Lie algebra of $T$. In this paper we describe the assignment module ${\mathcal{A}}_T(M)$ for a natural $T$-action on a Bott-Samelson manifold $M=B{S}^I$ and present a method for computing generators.