Anders Buch : Quantum K-theory of Grassmannians

Posted by , part of the Algebraic Geometry Seminar.

At

Feb. 21, 2008, 4 p.m.

In

SEO 636

Abstract

The Gromov-Witten invariants of a homogeneous space X give the number of rational curves of fixed degree that meet three general Schubert varieties, at least when this number is finite. When there are infinitely many such curves, then the moduli space of (stable) parametrizations of the curves is a projective variety. The K-theoretic Gromov-Witten invariants are the Euler characteristic of such varieties, and were used by Y.-P. Lee and Givental to define a quantum K-theory ring of X. I will present structure theorems for this ring when X is a Grassmann variety of type A, and a formula for the K-theoretic Gromov-Witten invariants that generalizes earlier work with Kresch and Tamvakis. This is joint work with L. Mihalcea.