$ \mathbb{Z}_{2} $- 轨道空间的同源性 $ G_{n,2}/ T^{n} $

Vladimir Ivanović, Svjetlana Terzić
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引用次数: 0

摘要

我们研究紧凑环$T^n$在复格拉斯曼流形$G_{n,2}$上的规范作用的轨道空间$X_n =G_{n,2}/T^n$ 的$\mathbb{Z}_2$同调群。我们的出发点是Buchstaber和Terzi\'c (2020)为$X_n$构建的模型$(U_n, p_n)$,其中$U_n = \Delta_{n,2}\times \mathcal{F}_{n}$为Buchstaber和Terzi\'c (2019), (2020)中定义的超复数$\Delta_{n,2}$和参数通用空间$\mathcal{F}_{n}$。Buchstaber 和 Terzi\'c (2021) 证明,$\mathcal{F}_{n}$ 与稳定的 $n$ 点属零曲线的模空间 $\mathcal{M}_{0,n}$ 是差分同构的。我们利用 Keel (1992) 和 Ceyhan (2009) 关于 $\mathcal{M}_{0,n}$ 的同调群的结果,并用 $\mathcal{F}_{n}$ 的分层来表达它们,这些分层被纳入模型 $(U_n, p_n)$ 中。我们还得到了 $X_5$ 和 $X_6$ 的$mathbb{Z}_2$同调群的明确公式。$X_5$ 的结果用不同的方法恢复了 Buchstaber and Terzi\'c (2021) 和 S\"uss (2020) 的结果。我们认为 $X_6$ 的结果是新的。
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$ \mathbb{Z}_{2} $- homology of the orbit spaces $ G_{n,2}/ T^{n} $
We study the $\mathbb{Z}_2$-homology groups of the orbit space $X_n = G_{n,2}/T^n$ for the canonical action of the compact torus $T^n$ on a complex Grassmann manifold $G_{n,2}$. Our starting point is the model $(U_n, p_n)$ for $X_n$ constructed by Buchstaber and Terzi\'c (2020), where $U_n = \Delta _{n,2}\times \mathcal{F}_{n}$ for a hypersimplex $\Delta_{n,2}$ and an universal space of parameters $\mathcal{F}_{n}$ defined in Buchstaber and Terzi\'c (2019), (2020). It is proved by Buchstaber and Terzi\'c (2021) that $\mathcal{F}_{n}$ is diffeomorphic to the moduli space $\mathcal{M}_{0,n}$ of stable $n$-pointed genus zero curves. We exploit the results from Keel (1992) and Ceyhan (2009) on homology groups of $\mathcal{M}_{0,n}$ and express them in terms of the stratification of $\mathcal{F}_{n}$ which are incorporated in the model $(U_n, p_n)$. In the result we provide the description of cycles in $X_n$, inductively on $ n. $ We obtain as well explicit formulas for $\mathbb{Z}_2$-homology groups for $X_5$ and $X_6$. The results for $X_5$ recover by different method the results from Buchstaber and Terzi\'c (2021) and S\"uss (2020). The results for $X_6$ we consider to be new.
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