arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1909.01909math.AG
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具有有限自同构群且无椭圆纤维化的K3曲面的几何

On the geometry of K3 surfaces with finite automorphism group and no elliptic fibrations

Xavier Roulleau

摘要:

Nikulin和Vinberg证明了只有有限个秩为$\geq 3$的格是具有有限自同构群的射影K3曲面的Néron-Severi群。本文的目的是提供一个更几何描述这样的K3表面$X$,当这些表面,而且没有椭圆纤维。在这种情况下,我们表明,这样的K3曲面要么是一个四次与特殊的超平面部分或双覆盖的平面分支上的光滑六次曲线,具有特殊的切线性质与一些线,二次曲线或尖点三次曲线。然后,我们研究的逆,即如果我们得到的几何描述这些表面的特点。在$4$的情况下,描述是足够的,在每一个$4$的其他情况下,正好有另一个我们研究的可能性。我们得到了在所研究的8个K3曲面中至少有5个模空间是单有理的。

英文摘要:

Nikulin and Vinberg proved that there are only a finite number of lattices of rank $\geq 3$ that are the Néron-Severi group of projective K3 surfaces with a finite automorphism group. The aim of this paper is to provide a more geometric description of such K3 surfaces $X$, when these surfaces have moreover no elliptic fibrations. In that case we show that such K3 surface is either a quartic with special hyperplane sections or a double cover of the plane branched over a smooth sextic curve which has special tangencies properties with some lines, conics or cuspidal cubic curves. We then study the converse i.e. if the geometric description we obtained characterizes these surfaces. In $4$ cases the description is sufficient, in each of the $4$ other cases there is exactly another one possibility which we study. We obtain that at least 5 moduli spaces of K3 surfaces (among the 8 we study) are unirational.

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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