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arXiv 1906.12295math.AG
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15-节四次曲面I:五次del Pezzo曲面与$\bbP^3$中的线汇

15-nodal quartic surfaces.I: quintic del Pezzo surfaces and congruences of lines in $\bbP^3$

Igor Dolgachev

摘要:

我们解释了一个经典的建设一个del Pezzo表面的程度d = 4或5作为一个光滑的二阶线汇在3-空间的焦面是一个四次曲面$X_{20-d}$与20-d普通二重点。我们还表明,$X_{15}$可以实现为一个超平面部分的Castelnuovo-Richmond-Igusa四次超曲面。由此证明了15结点四次曲面的模空间的合理性。我们讨论了$X_{15}$的其他一些双有理模型:$P^4$中的四次对称面、五节点四次曲面、十节点六次曲面和$P^6$中的十次非奇异曲面。最后,我们研究了15结点四次曲面的一些双有理对合,这些对合在本文第二部分中与I。Shimada等属于一般15结点四次曲面的双有理自同构群的生成元的有限集。

英文摘要:

We explain a classical construction of a del Pezzo surface of degree d = 4 or 5 as a smooth order two congruence of lines in 3-space whose focal surface is a quartic surface $X_{20-d}$ with 20-d ordinary double points. We also show that $X_{15}$ can be realized as a hyperplane section of the Castelnuovo-Richmond-Igusa quartic hypersurface. This leads to the proof of rationality of the moduli space of 15-nodal quartic surfaces. We discuss some other birational models of $X_{15}$: quartic symmetroids, 5-nodal quartic surfaces, 10-nodal sextic surfaces in $P^4$ and nonsingular surfaces of degree 10 in $P^6$. Finally we study some birational involutions of a 15-nodal quartic surface which, as it is shown in Part 2 of the paper jointly with I. Shimada, belong to a finite set of generators of the group of birational automorphisms of a general 15-nodal quartic surface.

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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