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arXiv 2302.09358math.AG
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加权射影空间中一类振幅为1的非凡椭圆曲面

A remarkable class of elliptic surfaces of amplitude 1 in weighted projective space

Gregory Pearlstein, Chris Peters, Appendix C by Wim Nijgh

AI总结:

本文分类并研究 P(1,2,a,b) 中4类振幅为1的拟光滑加权超曲面,构造模空间并分析其非单射周期映射与单值性,建立混合 Torelli 型结果及模空间紧化应用。

摘要:

普通射影空间中振幅为1的曲面属于一般型,但在加权射影空间中情况未必如此。事实上,在 P(1,2,a,b) 中存在4类拟光滑加权超曲面,其振幅为1,并具有由超平面截出的椭圆束。作者构造了它们的模空间,确定了其泛族的单值性以及周期映射;这些结果均被证明是非单射的。文中分析了背后的原因,并且每一种类型的原因都不相同。对于产生真椭圆曲面的两类,这导向了一个混合 Torelli 型定理,正如 Catanese–Kunev–Todorov 曲面的情形。作者还补充了对 K²=1、p_g=2、q=0 的一般型曲面模空间的某些紧化的应用,以及详细的 SageMath 计算。由 Wim Nijgh 撰写的附录表明,1型和2型椭圆族的一般成员具有“平凡”Picard 格,即由纤维分支和一个多重截面张成。

英文摘要:

Surfaces of amplitude 1 in ordinary projective space are of general type, but this need not be the case in weighted projective spaces. Indeed, there are 4 classes of quasi-smooth weighted hypersurfaces in $\mathbf{P}(1,2,a,b)$ of amplitude 1 with an elliptic pencil cut out by hyperplanes. Their moduli spaces are constructed, the monodromy of their universal families is determined as well as their period maps. These all turn out to be non-injective. We analyse the reason behind this, which for each type is different. For the two classes that give properly elliptic surfaces this leads to a mixed Torelli-type theorem as in the case of the Catanese-Kunev-Todorov surfaces. We added an application to certain compactifications of moduli spaces of surfaces of general type with $K^2=1$, $p_g=2$ and $q=0$, as well as detailed SageMath-calculations. The appendix written by Wim Nijgh shows that the general member of the type 1 and type 2 elliptic family has "trivial" Picard lattice, i.e. is spanned by fiber components and a multisection.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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