Finite models for the fixed-point components of Springer fibers

Let (e,h,f)(e,h,f) be an sl2\mathfrak{sl}_2 triple in g\mathfrak{g}, let TeT_e be the torus with Lie algebra Ch\mathbb{C}h, and let Spr\operatorname{Spr} be the Springer fiber. Set Fix:=SprTe\operatorname{Fix}:=\operatorname{Spr}^{T_e}. The group AeA_e acts on Fix\operatorname{Fix} and permutes its connected components; write (Fix)α(\operatorname{Fix})_\alpha for the variety corresponding to an AeA_e-orbit of components, and let YeY_e be an AeA_e-finite model of Spr\operatorname{Spr}. Finite-model conjecture. Each variety (Fix)α(\operatorname{Fix})_\alpha admits a unique AeA_e-finite model YαY_\alpha. Furthermore, YeY_e is the disjoint union of all YαY_\alpha. This predicts that the fixed-point components have canonical finite models whose union recovers the finite model of the Springer fiber.

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Primary source

Do Kien Hoang, “Geometry of the fixed points loci and discretization of Springer fibers in classical types”, arXiv:2405.10105 (2024).

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