RTGC Seminar: Mirror symmetry for minuscule flag varieties

Nicholas Templier, Cornell

We prove cases of Rietsch mirror conjecture that the Dubrovin-Givental quantum connection for projective homogeneous varieties is isomorphic to the pushforward D-module attached to Berenstein-Kazhdan geometric crystals. The idea is to recognize the quantum connection as Galois and the geometric crystal as automorphic. The isomorphism then comes from global rigidity results where a Hecke eigenform is determined by its local ramification. We reveal relations with the works of Gross, Frenkel-Gross, Heinloth-Ngo-Yun and Zhu on Kloosterman sheaves. It implies combinatorial identities for the counts of rational curves and the Peterson variety presentation as corollaries. Work with Thomas Lam.