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arXiv 0908.1938math.ATmath.HO
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模空间拓扑中的稳定性现象

Stability phenomena in the topology of moduli spaces

Ralph L. Cohen

摘要:

最近由Madsen和Weiss证明的关于黎曼曲面的模空间的稳定上同调的芒福德猜想,是关于模空间拓扑的一个重要稳定性定理的一个戏剧性的例子。本文综述了拓扑中出现“稳定现象”的分类空间族和模空间族。这样的稳定性定理在拓扑学和几何学的历史上已经在许多情况下得到了证明,并且其结果往往是非常显著的。在本文中,我们讨论经典的稳定性定理,如弗赖登塔尔暂停定理,博特周期性,惠特尼的嵌入定理。然后,我们讨论更现代的例子,如涉及配置空间的点在流形上,全纯曲线在复流形,规范理论的模空间,稳定的拓扑结构的一般线性群,和pseudositopies的流形。然后我们讨论了黎曼曲面的模空间的稳定性定理:关于模空间的上同调的Harer稳定性定理,以及Madsen-Weiss定理,它证明了Mumford猜想的推广。我们还描述了加拉休斯最近定理的稳定上同调的自同构的自由群。最后,我们推测存在的一般条件下,人们可能会期望这些稳定性现象发生。

英文摘要:

The recent proof by Madsen and Weiss of Mumford's conjecture on the stable cohomology of moduli spaces of Riemann surfaces, was a dramatic example of an important stability theorem about the topology of moduli spaces. In this article we give a survey of families of classifying spaces and moduli spaces where "stability phenomena" occur in their topologies. Such stability theorems have been proved in many situations in the history of topology and geometry, and the payoff has often been quite remarkable. In this paper we discuss classical stability theorems such as the Freudenthal suspension theorem, Bott periodicity, and Whitney's embedding theorems. We then discuss more modern examples such as those involving configuration spaces of points in manifolds, holomorphic curves in complex manifolds, gauge theoretic moduli spaces, the stable topology of general linear groups, and pseudoisotopies of manifolds. We then discuss the stability theorems regarding the moduli spaces of Riemann surfaces: Harer's stability theorem on the cohomology of moduli space, and the Madsen-Weiss theorem, which proves a generalization of Mumford's conjecture. We also describe Galatius's recent theorem on the stable cohomology of automorphisms of free groups. We end by speculating on the existence of general conditions in which one might expect these stability phenomena to occur.

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