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arXiv 1001.5366math.GTmath.AT
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框架曲面、r-Spin曲面和Pin曲面的模空间和映射类群的同调

Homology of the moduli spaces and mapping class groups of framed, r-Spin and Pin surfaces

Oscar Randal-Williams

摘要:

我们给出了框架曲面、r-Spin曲面和Pin曲面的模空间的定义。我们应用作者早期的工作表明,这些模空间表现出同调稳定性,我们确定了稳定的积分同调与某些无限闭路空间在每种情况下。我们进一步证明了这些模空间中的每一个都有路径分量,它们分别是框架、r-Spin和Pin映射类群的Eilenberg-MacLane空间,因此我们也证明了这些群的稳定群同调.特别是:稳定的框架映射类群具有平凡的有理同调,其阿贝尔化为Z/24,稳定的Pin映射类群的有理同调与不可定向的映射类群的有理同调一致,其阿贝尔化对Pin^+为Z/2,对Pin^-为(Z/2)^3.

英文摘要:

We give definitions of moduli spaces of framed, r-Spin and Pin surfaces. We apply earlier work of the author to show that each of these moduli spaces exhibits homological stability, and we identify the stable integral homology with that of certain infinite loop spaces in each case. We further show that these moduli spaces each have path components which are Eilenberg--MacLane spaces for the framed, r-Spin and Pin mapping class groups respectively, and hence we also identify the stable group homology of these groups. In particular: the stable framed mapping class group has trivial rational homology, and its abelianisation is Z/24; the rational homology of the stable Pin mapping class groups coincides with that of the non-orientable mapping class group, and their abelianisations are Z/2 for Pin^+ and (Z/2)^3 for Pin^-.

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