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arXiv 1707.08249math.RT
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A型非反常Soergel双模

A non-perverse Soergel bimodule in type A

Nicolas Libedinsky, Geordie Williamson

摘要:

关于不可分解Soergel双模的一个基本问题是理解它们的自同态环。在特征零中,所有零度自同态都是同构(Elias和第二作者证明了这一事实),这意味着Kazhdan-Lusztig拓扑。最近,许多正特征的例子被发现具有更大的零度自同态。这些给出了Lusztig猜想中期望界的反例。本文证明了具有非零负度自同态的A型不可分解Soergel双模的存在性。这给出了在类型A中存在一个非反常宇称层。

英文摘要:

A basic question concerning indecomposable Soergel bimodules is to understand their endomorphism rings. In characteristic zero all degree-zero endomorphisms are isomorphisms (a fact proved by Elias and the second author) which implies the Kazhdan-Lusztig conjectures. More recently, many examples in positive characteristic have been discovered with larger degree zero endomorphisms. These give counter-examples to expected bounds in Lusztig's conjecture. Here we prove the existence of indecomposable Soergel bimodules in type A having non-zero endomorphisms of negative degree. This gives the existence of a non-perverse parity sheaf in type A.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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