Finite models for the fixed-point components of Springer fibers

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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⁡:=Spr⁡Te\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.

References

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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