Can I read Quantum Bruhat graph and Schubert polynomials on EtoBox?

Quantum Bruhat graph and Schubert polynomials by Postnikov, Alexander is a scholarly article available to read on EtoBox.

What is Quantum Bruhat graph and Schubert polynomials about?

The quantum Bruhat graph, which is an extension of the graph formed by covering relations in the Bruhat order, is naturally related to the quantum cohomology ring of G/B. We enhance a result of Fulton and Woodward by showing that the minimal monomial in the quantum parameters that occurs in the quantum product of two Schubert classes has a simple interpretation in terms of directed paths in this graph. We define path Schubert polynomials, which are quantum cohomology analogues of skew Schubert polynomials recently introduced by Lenart and Sottile. They are given by sums over paths in the quantum Bruhat graph of type A. The 3-point Gromov-Witten invariants for the flag manifold are expressed in terms of these polynomials. This construction gives a combinatorial description for the set of all monomials in the quantum parameters that occur in the quantum product of two Schubert classes.

Author

Postnikov, Alexander

Published

2002

Language

EN