arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1102.2550math.AG
收藏

关于三次超曲面上1-圈之间的关系

On relations among 1-cycles on cubic hypersurfaces

Mingmin Shen

摘要:

本文给出了光滑三次超曲面$X$上1-圈模有理等价之间的两个显式关系。这样的关系是根据一条(一对)曲线及其割线给出的。作为第一个应用,我们重新证明了Paranjape定理:$\mathrm{CH}_1(X)$总是由直线生成的,并且当$X$的维数至少为5时,它同构于$\Z$.另一个应用是三次三重$X$的中间雅可比。为了更精确地,我们证明了$X$的中间雅可比矩阵是自然同构的Prym-Tjurin品种构造的曲线参数化所有线满足一个给定的曲线$X$。关联对应在本研究中起着重要的作用。我们也给出了在此设置的Abel-Jacobi映射的1-圈的描述。

英文摘要:

In this paper we give two explicit relations among 1-cycles modulo rational equivalence on a smooth cubic hypersurfaces $X$. Such a relation is given in terms of a (pair of) curve(s) and its secant lines. As the first application, we reprove Paranjape's theorem that $\mathrm{CH}_1(X)$ is always generated by lines and that it is isomorphic to $\Z$ if the dimension of $X$ is at least 5. Another application is to the intermediate jacobian of a cubic threefold $X$. To be more precise, we show that the intermediate jacobian of $X$ is naturally isomorphic to the Prym-Tjurin variety constructed from the curve parameterizing all lines meeting a given curve on $X$. The incidence correspondences play an important role in this study. We also give a description of the Abel-Jacobi map for 1-cycles in this setting.

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。

↑