Perverse sheaves on semiabelian varieties

Perverse sheaves on semiabelian varieties
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半阿贝尔品种上的反常滑轮

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发表时间:
2013
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通讯作者:
Thomas Kramer
Thomas Kramer
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作者:
Thomas Kramer

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给出了半交换树簇上L-进倒叶范畴的Tannakian刻划,它结合了代数环面上的Gabber和Loeser结构和交换树簇上可构叶的上同调的一个一般零化定理.作为应用,我们解释了如何通过附近圈的函子,用半交换退化来研究交换簇上产生的Tannaka群。
We give a Tannakian description for categories of l-adic perverse sheaves on semiabelian varieties which combines a construction of Gabber and Loeser for algebraic tori with a generic vanishing theorem for the cohomology of constructible sheaves on abelian varieties. As an application we explain how the arising Tannaka groups on abelian varieties can be studied in terms of semiabelian degenerations via the functor of nearby cycles.