Lusztig's conjecture on generic positive-depth parabolic induction

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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 Tr⊂Br⊂GrT_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

pInd⁡BrGr(L)=π!f∗L,\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 pInd⁡BrGr(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.

References

Primary source

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

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