Generic torsion vanishing conjecture for Shimura varieties

Let (G,X)(\mathbf{G},X) be a Shimura datum such that G=GQpG=\mathbf{G}_{\mathbb{Q}_{p}} is unramified, and let K=KpKpK=K_{p}K^{p} be a sufficiently small level with Kp=KphsK_{p}=K_{p}^{\mathrm{hs}} hyperspecial. Set d=dim(Sh(G,X)K)d=\operatorname{dim}(\mathrm{Sh}(\mathbf{G},X)_{K}). A maximal ideal mHKphs\mathfrak{m}\subset H_{K_{p}^{\mathrm{hs}}} is generic when its associated toral LL-parameter satisfies the genericity condition described in the surrounding text. Generic torsion vanishing conjecture. If m\mathfrak{m} is generic, then the cohomology of

RΓ(Sh(G,X)K,E,F)mR\Gamma(\mathrm{Sh}(\mathbf{G},X)_{K,\overline{E}},\overline{\mathbb{F}}_{\ell})_{\mathfrak{m}}

is concentrated in degrees di2dd\leq i\leq 2d, while the cohomology of

RΓc(Sh(G,X)K,E,F)mR\Gamma_{c}(\mathrm{Sh}(\mathbf{G},X)_{K,\overline{E}},\overline{\mathbb{F}}_{\ell})_{\mathfrak{m}}

is concentrated in degrees 0id0\leq i\leq d. This predicts torsion-vanishing ranges for localized cohomology under a genericity hypothesis; the source motivates it by known results for general linear groups, but supplies no resolution.

Sources & referencesView supporting material

Primary source

Linus Hamann and Si Ying Lee, “Torsion Vanishing for Some Shimura Varieties”, arXiv:2309.08705 (2026).

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