Bethe subalgebras in Yangians and Kirillov-Reshetikhin crystals

Abstract

Let $\mathfrak{g}$ be a simple finite-dimensional Lie algebra and $G$ its adjoint group. For each $C\in G$, we consider the Bethe subalgebra $B(C)\subset Y(\mathfrak{g})$, a commutative subalgebra encoding the integrals of the generalized $XXX$ spin chain. Adapting the construction of arXiv:1708.05105 of $\mathfrak{g}$-crystals on spectra of inhomogeneous Gaudin subalgebras in $U(\mathfrak{g})$, we construct a natural $\hat{\mathfrak{g}}$-crystal structure on the spectra of $B(C)$ in Kirillov--Reshetikhin $Y(\mathfrak{g})$-modules in type $A$. We conjecture that such a construction exists for arbitrary $\mathfrak{g}$ and recovers Kirillov--Reshetikhin crystals. The main technical ingredient is a degeneration of Bethe subalgebras $B(C)$ to commutative subalgebras ${\mathcal{A}}_{\chi }^{\mathrm{u}}\subset U(\mathfrak{g}[t])$, depending on $\chi \in \mathfrak{g}$. We call these subalgebras universal inhomogeneous Gaudin subalgebras and show that they arise from the Feigin--Frenkel center at the critical level. This allows us to identify the affine crystals above with Kirillov--Reshetikhin crystals. We then apply these results to prove the monodromy conjecture of Ilin and the second and third authors for the spectra of the algebras $B(C)$ and for the spectra of quantum cohomology rings of type $A$ quiver varieties.

v2: 71 pages, added Theorems B and C