arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1903.02481math.AG
收藏

超曲面的线性子空间

Linear subspaces of hypersurfaces

Roya Beheshti, Eric Riedl

摘要:

设$X$是$\mathbb{C} \mathbb{P}^n$中次数为$d$的任意光滑超曲面.证明了$n \geq 2d-4$的de Jong-Debarre猜想:$X$中的线空间具有维数$2n-d-3$ .对于$k$ -平面,我们也证明了一个类似的结果:如果$n \geq 2 \binom{d+k-1}{k} + k$,则在$X$上的$k$ -平面的空间是期望维数的不可约空间.作为应用,我们证明了满足$n \geq 2^{d!}$的任意光滑超曲面是单有理的,并证明了在满足$d \leq \frac{e+n}{e+1}$的条件下,$X$上的次数$e$曲线空间是期望维数的不可约空间.

英文摘要:

Let $X$ be an arbitrary smooth hypersurface in $\mathbb{C} \mathbb{P}^n$ of degree $d$. We prove the de Jong-Debarre Conjecture for $n \geq 2d-4$: the space of lines in $X$ has dimension $2n-d-3$. We also prove an analogous result for $k$-planes: if $n \geq 2 \binom{d+k-1}{k} + k$, then the space of $k$-planes on $X$ will be irreducible of the expected dimension. As applications, we prove that an arbitrary smooth hypersurface satisfying $n \geq 2^{d!}$ is unirational, and we prove that the space of degree $e$ curves on $X$ will be irreducible of the expected dimension provided that $d \leq \frac{e+n}{e+1}$.

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。

↑