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arXiv 2107.09192math.AG
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预稳定曲线堆的Chow环II

Chow rings of stacks of prestable curves II

Younghan Bae, Johannes Schmitt

摘要:

我们继续研究[arXiv:2012.09887v2]中开始的预稳定曲线的模量堆叠$\mathfrak{M}_{g,n}$的Chow环。在亏格$0$中,我们证明了$\mathfrak{M}_{0,n}$的Chow环与重言式环重合,并给出了(加性)生成元和关系的完整描述.这推广了Keel和Kontsevich-Manin关于稳定曲线空间的早期结果。我们的论点使用的边界分层的模量叠加一起研究的第一个更高的Chow组的地层,特别是提供了一个新的证明Kontsevich和Manin的结果。

英文摘要:

We continue the study of the Chow ring of the moduli stack $\mathfrak{M}_{g,n}$ of prestable curves begun in [arXiv:2012.09887v2]. In genus $0$, we show that the Chow ring of $\mathfrak{M}_{0,n}$ coincides with the tautological ring and give a complete description in terms of (additive) generators and relations. This generalizes earlier results by Keel and Kontsevich-Manin for the spaces of stable curves. Our argument uses the boundary stratification of the moduli stack together with the study of the first higher Chow groups of the strata, in particular providing a new proof of the results of Kontsevich and Manin.

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