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arXiv 1811.02466math.AG
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正特征Fano完全交的弱逼近

Weak approximation for Fano complete intersections in positive characteristic

Jason Michael Starr, Zhiyu Tian, Runhong Zong

摘要:

对于代数闭域$k$上的光滑曲线$B$,对$(d_1,\dots,d_c)$型$B\times_{\text{Spec}\ k} \mathbb{P}^n_k$中的每个$B$ -平坦完全交$X_B$,若Fano指标为$\geq 2$且若$\text{char}(k)>\max(d_1,\dots,d_c)$,我们证明了$X_B$的$\widehat{\mathcal{O}}_{B,b}$-点在(强)潜在好约化的所有位置(包括好约化的所有位置)被$k(B)$ -点弱逼近.关键的一步是证明这种完全相交是\emph{separably uniruled by lines},甚至是\emph{separably rationally connected},只要是光滑的。我们证明了这个不等式接近于sharp。对于Picard数$1$和Fano指标$1$的Fano流形,我们证明了一个类似的定理.

英文摘要:

For a smooth curve $B$ over an algebraically closed field $k$, for every $B$-flat complete intersection $X_B$ in $B\times_{\text{Spec}\ k} \mathbb{P}^n_k$ of type $(d_1,\dots,d_c)$, if the Fano index is $\geq 2$ and if $\text{char}(k)>\max(d_1,\dots,d_c)$, we prove weak approximation of $\widehat{\mathcal{O}}_{B,b}$-points of $X_B$ by $k(B)$-points at all places of (strong) potentially good reduction, including all places of good reduction. The key step is the proof that such complete intersections are \emph{separably uniruled by lines}, and even \emph{separably rationally connected}, whenever smooth. We prove that the inequality is close to sharp. We prove a similar theorem for Fano manifolds of Picard number $1$ and Fano index $1$.

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