arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 0905.2360math.GTmath.GR
收藏

一些不能由非同态实现的映射类群

Some groups of mapping classes not realized by diffeomorphisms

Mladen Bestvina, Thomas Church, Juan Souto

摘要:

设S是亏格g >= 2的闭曲面,Z是S中的一点.证明了闭曲面的基本群pi_1(S,z)所对应的映射类群Map(S,z)的子群不提升到S的不动点同态群.作为推论,我们证明了Atiyah-Kodaira曲面丛不存在不变平坦联络,并得到了Morita非提升定理的另一个证明。

英文摘要:

Let S be a closed surface of genus g >= 2 and z in S a marked point. We prove that the subgroup of the mapping class group Map(S,z) corresponding to the fundamental group pi_1(S,z) of the closed surface does not lift to the group of diffeomorphisms of S fixing z. As a corollary, we show that the Atiyah-Kodaira surface bundles admit no invariant flat connection, and obtain another proof of Morita's non-lifting theorem.

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。

↑