Betti moduli embedding conjecture for all microsheaves on the affine Springer fiber

Let B,+B^{\vee,+} and B,B^{\vee,-} be opposite Borel subgroups of GG^{\vee} with B,+B,=TB^{\vee,+}\cap B^{\vee,-}=T^{\vee}. Set W=B,B,+G\mathcal{W}=B^{\vee,-}B^{\vee,+}\subset G^{\vee}, let W0=WU\mathcal{W}_0=\mathcal{W}\cap\mathcal{U}^{\vee}, and let W~0\widetilde{\mathcal{W}}_0 be the restriction of the Springer resolution U~\widetilde{\mathcal{U}^{\vee}} to W0\mathcal{W}_0. The torus TT^{\vee} acts by conjugation. Betti moduli embedding conjecture. There is a full embedding

μShFlψ(Mψ)QCohT(W~0)\mu\operatorname{Sh}_{\operatorname{Fl}_\psi}(\mathcal{M}_\psi)\hookrightarrow \operatorname{QCoh}^{T^{\vee}}(\widetilde{\mathcal{W}}_0)

extending the equivalence in Theorem DψD_\psi--coherent in the stated sense: the Kirillov category is the full subcategory supplied by Theorem mic, while the coherent category is identified with the full subcategory supported on BW~0\mathcal{B}^{\vee}\hookrightarrow\widetilde{\mathcal{W}}_0, the fiber over 1W01\in\mathcal{W}_0. Moreover, this embedding intertwines the natural actions of X(T)\mathbb{X}_*(T) on both sides. This would extend the known description of the relevant subcategory of microsheaves to all microsheaves and relate them to coherent sheaves on a Betti moduli space for GG^{\vee}; the source presents it as a further direction and gives no resolution.

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Primary source

Roman Bezrukavnikov, Pablo Boixeda Alvarez, Michael McBreen and Zhiwei Yun, “Affine Springer fiber and the small quantum group”, arXiv:2604.11966 (2026).

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