Equivariant Seidel multiplication conjecture in quantum K-theory

Let X=G/PX=G/P be a flag variety over C\mathbb C, let WcominW^{\mathrm{comin}} be the subgroup of point representatives of cominuscule flag varieties together with the identity, and let QKT(X)\operatorname{QK}_T(X) be the equivariant quantum KK-theory ring. For wWcominw\in W^{\mathrm{comin}} and uWu\in W, let d(w,u)d(w,u) be the associated effective curve degree. Equivariant Seidel multiplication conjecture.

[OXw0w][OXu]=qd(w,u)[Ow1.Xwu][\mathcal O_{X_{w_0w}}]\star[\mathcal O_{X^u}]=q^{d(w,u)}[\mathcal O_{w^{-1}.X^{wu}}]

and

[OXw][Ow.Xu]=qd(w,u)[OXwu][\mathcal O_{X^w}]\star[\mathcal O_{w.X^u}]=q^{d(w,u)}[\mathcal O_{X^{wu}}]

in QKT(X)\operatorname{QK}_T(X). The two identities are equivalent. The non-equivariant case is known for cominuscule flag varieties, while the equivariant statement is the quantum KK-theoretic analogue of the established quantum-cohomology Seidel formula.

Sources & referencesView supporting material

Primary source

Anders S. Buch, Pierre-Emmanuel Chaput and Nicolas Perrin, “Equivariant rigidity of Richardson varieties”, arXiv:2409.11387 (2025).

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