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arXiv 2011.04017math.AGmath.DG
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有限群作用在Higgs丛模空间上

Finite group actions on Higgs bundle moduli spaces

Guillermo Barajas, Suratno Basu, Oscar García-Prada

AI总结:

研究有限群在G-Higgs丛模空间上的作用的不动点,通过扭Γ-等变丛理论和Prym-Narasimhan-Ramanan构造描述,并借助非阿贝尔Hodge对应给出G-特征簇上的不动点子簇。

摘要:

令${\cal M}(X,G)$为紧黎曼曲面$X$上$G$-Higgs丛的模空间,其中$G$是中心为$Z$的半单复李群。我们描述了有限群$\Gamma$在${\cal M}(X,G)$上作用的不动点,该作用由$\Gamma$在$X$和$G$上的全纯作用、$\Gamma$的一个特征以及从$\Gamma$到$X$上$Z-丛$群的同态诱导。该研究的两个重要工具是由Barajas--García-Prada--Gothen--Mundet i Riera发展的扭$\Gamma$-等变丛理论,以及由Barajas--García-Prada给出的Prym--Narasimhan--Ramanan构造。通过非阿贝尔Hodge对应,我们的结果描述了$X$基本群的$G$-特征簇上某些有限群作用的不动点子簇。

英文摘要:

Let ${\cal M}(X,G)$ be the moduli space of $G$-Higgs bundles over a compact Riemann surface $X$, where $G$ is a semisimple complex Lie group with centre $Z$. We describe the fixed points of the action of a finite group $Γ$ on ${\cal M}(X,G)$, induced by holomorphic actions of $Γ$ on $X$ and $G$, a character of $Γ$ and a homomorphism from $Γ$ to the group of $Z$-bundles over $X$. Two important ingredients in this study are provided by the theory of twisted $Γ$-equivariant bundles developed by Barajas--García-Prada--Gothen--Mundet i Riera, and the Prym--Narasimhan--Ramanan construction given by Barajas--García-Prada. Via the non-abelian Hodge correspondence, our results provide a description of the fixed-point subvarieties of certain finite group actions on the $G$-character variety of the fundamental group of $X$.

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