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Cluster realizations of Weyl groups and higher Teichmüller theory
Selecta Mathematica ( IF 1.2 ) Pub Date : 2021-05-25 , DOI: 10.1007/s00029-021-00630-9
Rei Inoue , Tsukasa Ishibashi , Hironori Oya

For a symmetrizable Kac–Moody Lie algebra \({\mathfrak {g}}\), we construct a family of weighted quivers \(Q_m({\mathfrak {g}})\) (\(m \ge 2\)) whose cluster modular group \(\Gamma _{Q_m({\mathfrak {g}})}\) contains the Weyl group \(W({\mathfrak {g}})\) as a subgroup. We compute explicit formulae for the corresponding cluster \({{\mathcal {A}} }\)- and \({{\mathcal {X}} }\)-transformations. As a result, we obtain green sequences and the cluster Donaldson–Thomas transformation for \(Q_m({\mathfrak {g}})\) in a systematic way when \({\mathfrak {g}}\) is of finite type. Moreover if \({\mathfrak {g}}\) is of classical finite type with the Coxeter number h, the quiver \(Q_{kh}({\mathfrak {g}})\) (\(k \ge 1\)) is mutation-equivalent to a quiver encoding the cluster structure of the higher Teichmüller space of a once-punctured disk with 2k marked points on the boundary, up to frozen vertices. This correspondence induces the action of direct products of Weyl groups on the higher Teichmüller space of a general marked surface. We finally prove that this action coincides with the one constructed in Goncharov and Shen (Adv Math 327:225–348, 2018) from the geometrical viewpoint.



中文翻译:

Weyl群的聚类实现和高级Teichmüller理论

对于对称Kac–Moody Lie代数\({\ mathfrak {g}} \\),我们构造了一系列加权颤动\(Q_m({\ mathfrak {g}})\)\(m \ ge 2 \)),其集群模块化组\(\ Gamma _ {Q_m({\ mathfrak {g}})} \)包含Weyl组\(W({\ mathfrak {g}})\)作为子组。我们为相应的簇\({{\ mathcal {A}}} \) -和\({{\ mathcal {X}}} \) -转换计算显式公式。结果,当\({\ mathfrak {g}} \)为有限类型时,我们以系统的方式获得了绿色序列和\(Q_m({\ mathfrak {g}})\)的聚类唐纳森-托马斯变换。而且如果\({\ mathfrak {g}} \)是经典有限类型,其Coxeter数为h,颤动\(Q_ {kh}({\ mathfrak {g}})\)\(k \ ge 1 \))是等同于颤动的颤动,颤动是编码一次穿孔的磁盘的较高Teichmüller空间的簇结构的颤动,在边界上有2 k个标记点,直至冻结的顶点。这种对应关系诱导了Weyl基团的直接产物对一般标记表面的较高Teichmüller空间的作用。我们最终证明,从几何学角度来看,该动作与在Goncharov和Shen中构建的动作相吻合(Adv Math 327:225–348,2018年)。

更新日期:2021-05-25
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