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arXiv 0802.0814math.GTmath.AGmath.NT
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映射类群完备化的相对权滤子

Relative Weight Filtrations on Completions of Mapping Class Groups

Richard Hain

摘要:

本文讨论了与标记亏格g曲线的稳定退化有关的映射类群的完备化的相对权滤子。这些相对权重过滤器已被构造使用伽罗瓦论(与松本)和霍奇理论(与Pearlstein和Terasoma)。结果表明,0级部分的相对重量过滤是一个类似的Kac-Moody李代数的抛物子代数。它表明,所有这样的子代数对应于等价类的裤子分解的表面-两个是等价的,当且仅当它们确定相同的参考表面边界的身体。一个应用是证明映射类群的主体子群包含任意远的Torelli群的下中心序列的元素。(This Jamie Jorgensen也独立获得了这一结果。

英文摘要:

This paper gives an exposition of relative weight filtrations on completions of mapping class groups associated to a stable degeneration of marked genus g curves. These relative weight filtrations have been constructed using Galois theory (with Matsumoto) and Hodge theory (with Pearlstein and Terasoma). It is shown that the level 0 part of the relative weight filtration is an analogue of a parabolic subalgebra of a Kac-Moody Lie algebra. It is shown that all such subalgebras correspond to equivalence classes of pants decompositions of the surface -- two being equivalent if and only if they determine the same handlebody that the reference surface bounds. One application is to show that handlebody subgroups of mapping class groups contain elements arbitrarily far down the lower central series of Torelli groups. (This result was also obtained independently by Jamie Jorgensen.)

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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