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The parabolic exotic t-structure

Abstract : Let G be a connected reductive algebraic group over an algebraically closed field k, with simply connected derived subgroup. The exotic t-structure on the cotangent bundle of its flag variety T^*(G/B), originally introduced by Bezrukavnikov, has been a key tool for a number of major results in geometric representation theory, including the proof of the graded Finkelberg-Mirkovic conjecture. In this paper, we study (under mild technical assumptions) an analogous t-structure on the cotangent bundle of a partial flag variety T^*(G/P). As an application, we prove a parabolic analogue of the Arkhipov-Bezrukavnikov-Ginzburg equivalence. When the characteristic of k is larger than the Coxeter number, we deduce an analogue of the graded Finkelberg-Mirkovic conjecture for some singular blocks.
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Submitted on : Monday, November 19, 2018 - 3:55:35 PM
Last modification on : Wednesday, February 26, 2020 - 3:00:04 PM
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  • HAL Id : hal-01788372, version 2
  • ARXIV : 1805.05624



Pramod N Achar, Nicholas Cooney, Simon N. Riche. The parabolic exotic t-structure. Épijournal de Géométrie Algébrique, EPIGA, In press, 2. ⟨hal-01788372v2⟩



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