Lusztig's conjecture on generic positive-depth parabolic induction

Let GG be a connected reductive group over the maximal unramified extension of a non-archimedean local field, let GrG_r be the truncated parahoric group scheme associated to a point in a torus apartment, and let TrBrGrT_r\subset B_r\subset G_r arise from a split maximal torus and a containing Borel subgroup. For r>0r>0, let L\mathcal{L} be a sufficiently generic multiplicative local system on TrT_r, and define

pIndBrGr(L)=π!fL,\operatorname{pInd}_{B_r}^{G_r}(\mathcal{L})=\pi_!f^*\mathcal{L},

using the maps ff and π\pi from the associated diagram. Lusztig's conjecture. The complex pIndBrGr(L)\operatorname{pInd}_{B_r}^{G_r}(\mathcal{L}) is an intersection cohomology complex on GrG_r. This predicts that sufficiently generic positive-depth character sheaves arise by parabolic induction; the paper establishes a corresponding result under its genericity hypotheses, while the conjecture is presented here in its original form.

Sources & referencesView supporting material

Primary source

Roman Bezrukavnikov and Charlotte Chan, “Generic character sheaves on parahoric subgroups”, arXiv:2401.07189 (2025).

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