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arXiv 1105.0655math.AG
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$\bar{M}_{0,n}$上的循环覆盖态射

Cyclic covering morphisms on $\bar{M}_{0,n}$

Maksym Fedorchuk

摘要:

我们研究从$\bar{M}_{0,n}$到正亏格的无点稳定曲线的模空间或主极化阿贝尔簇的紧化模空间的循环覆盖态射。我们的主要应用是在$\bar{M}_{0,n}$上构造新的半正向量丛和nef因子,并着眼于F-猜想.特别地,我们构造了$\bar{M}_{0,n}$的对称nef锥的新的极值射线。我们还发现了一个替代的描述所有sl 1级共形块因子上$\bar{M}_{0,n}$。

英文摘要:

We study cyclic covering morphisms from $\bar{M}_{0,n}$ to moduli spaces of unpointed stable curves of positive genus or compactified moduli spaces of principally polarized abelian varieties. Our main application is a construction of new semipositive vector bundles and nef divisors on $\bar{M}_{0,n}$, with a view toward the F-conjecture. In particular, we construct new extremal rays of the symmetric nef cone of $\bar{M}_{0,n}$. We also find an alternate description of all sl level 1 conformal blocks divisors on $\bar{M}_{0,n}$.

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