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Hikita surjectivity for $\mathcal N /// T$
[Submitted on 21 Oct 2024 (v1), last revised 17 Jun 2026 (this v · 2026-06-18 · via math updates on arXiv.org

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Abstract:The Hamiltonian reduction $\mathcal N///T$ of the nilpotent cone in $\mathfrak{sl}_n$ by the torus of diagonal matrices is a Nakajima quiver variety which admits a symplectic resolution $\widetilde{\mathcal N///T}$, and the corresponding BFN Coulomb branch is the affine closure $\overline{T^*(G/U)}$ of the cotangent bundle of the base affine space. We construct a surjective map $\mathbb C\left[\overline{T^*(G/U)}^{T\times B/U}\right] \twoheadrightarrow H^*\left(\widetilde{\mathcal N /// T}\right)$ of graded algebras, which the Hikita conjecture predicts to be an isomorphism. Our map is inherited from a related case of the Hikita conjecture and factors through Kirwan surjectivity for quiver varieties. We conjecture that many other Hikita maps can be inherited from that of a related dual pair.

Submission history

From: Linus Setiabrata [view email]
[v1] Mon, 21 Oct 2024 17:19:59 UTC (130 KB)
[v2] Wed, 17 Jun 2026 16:44:48 UTC (131 KB)