  We give a new proof of an unpublished result of Dale Peterson, proved by Lam
and Shimozono, which identifies explicitly the structure constants, with
respect to the quantum Schubert basis, for the $T$-equivariant quantum
cohomology $QH^{\bullet}_T(G/P)$ of any flag variety $G/P$ with the structure
constants, with respect to the affine Schubert basis, for the $T$-equivariant
Pontryagin homology $H^T_{\bullet}(\mathcal{G}r)$ of the affine Grassmannian
$\mathcal{G}r$ of $G$, where $G$ is any simple simply-connected complex
algebraic group.
  Our approach is to construct an $H_T^{\bullet}(pt)$-algebra homomorphism by
Gromov-Witten theory and show that it is equal to Peterson's map. More
precisely, the map is defined via Savelyev's generalized Seidel representations
which can be interpreted as certain Gromov-Witten invariants with input
$H^T_{\bullet}(\mathcal{G}r)\otimes QH_T^{\bullet}(G/P)$. We determine these
invariants completely, in a way similar to how Fulton and Woodward did in their
proof of quantum Chevalley formula.
