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arXiv math/0609819math.RT
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小量子群与Springer分辨

The small quantum group and the Springer resolution

Roman Bezrukavnikov, Anna Lachowska

摘要:

在math.RT/0304173中,在单位根处的Lusztig量子代数上的模中的主块的导出范畴与在Springer分解上的等变相干层的导出范畴相关。本文导出了{ \em小(约化)量子代数}的主块的导出范畴与(非等变)相干层的导出范畴在Springer分解上的类似关系.作为应用,我们得到了小量子群正则块的Hochschild上同调(特别是中心)的几何描述,并利用它给出了中心上某个子代数的显式描述(以前用另一种方法在数学中更严格的假设下得到).QA/0107098.我们还简要地说明了我们的结果与De Concini - Kac量子代数上模的导出范畴的几何描述math.RT/0407048的关系。

英文摘要:

In math.RT/0304173 the derived category of the principal block in modules over the Lusztig quantum algebra at a root of unity is related to the derived category of equivariant coherent sheaves on the Springer resolution. In the present paper we deduce a similar relation between the derived category of the principal block for the {\em small (reduced) quantum algebra} and the derived category of (non-equivariant) coherent sheaves on the Springer resolution. As an application we get a geometric description of Hochschild cohomology (in particular, the center) of the regular block for the small quantum group, and use it to give an explicit description of a certain subalgebra in the center (obtained previously by another method and under more restrictive assumptions in math.QA/0107098. We also briefly explain the relation of our result to the geometric description math.RT/0407048 of the derived category of modules over the De Concini -- Kac quantum algebra.

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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