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arXiv 1504.00352math.AGhep-thmath.QAmath.RT
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上同调Hall代数与character簇

Cohomological Hall algebras and character varieties

Ben Davison

摘要:

本文通过Kontsevich和Soibelman引入的3-Calabi-Yau范畴中对象模的上同调Hall代数的一个具体例子,研究了扭曲特征标簇与非扭曲特征标簇之间的关系.根据唐纳森-托马斯理论,通过Hausel和Villegas对扭曲字符簇和非扭曲字符堆的E多项式的计算,可以完全理解这种关系。我们提出了一个上同调霍尔代数设置的这种关系的一个几何提升。

英文摘要:

In this paper we investigate the relationship between twisted and untwisted character varieties via a specific instance of the Cohomological Hall algebra for moduli of objects in 3-Calabi-Yau categories introduced by Kontsevich and Soibelman. In terms of Donaldson--Thomas theory, this relationship is completely understood via the calculations of Hausel and Villegas of the E polynomials of twisted character varieties and untwisted character stacks. We present a conjectural lift of this relationship to the cohomological Hall algebra setting.

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