Positivity of equivariant Gromov-Witten invariants

Abstract

We show that the equivariant Gromov-Witten invariants of a projective homogeneous space G/P exhibit Graham-positivity: when expressed as polynomials in the positive roots, they have nonnegative coefficients.

8 pages; v2 corrects a sign error, and in Section 3 corrects the definition of the group action