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arXiv 1710.03076math.AG
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正特性正则极化表面的向量场和模量

Vector fields and moduli of canonically polarized surfaces in positive characteristic

Nikolaos Tziolas

摘要:

本文研究了定义在具有非平凡整体向量场的正特征域上的光滑正则极化曲面的几何性质,以及这种曲面的存在性对正则极化曲面的模问题的影响。特别地,得到了一个显式实值函数f(x),使得如果$X$是定义在特征p>0的代数闭域上的光滑正则极化曲面,使得$K_X^2 <f(p)$,则$X$是单有理的,其代数基本群的阶至多为2.作为这个结果的结果,大类的正则极化表面被确定其模量堆栈是德利涅-芒福德,一个属性,不持有一般的积极特征。

英文摘要:

This paper investigates the geometry of smooth canonically polarized surfaces defined over a field of positive characteristic which have a nontrivial global vector field, and the implications that the existence of such surfaces has in the moduli problem of canonically polarized surfaces. In particular, an explicit real valued function f(x) is obtained such that if $X$ is a smooth canonically polarized surface defined over an algebraically closed field of characteristic p>0 such that $K_X^2 <f(p)$, then $X$ is unirational and the order of its algebraic fundamental group is at most two. As a consequence of this result, large classes of canonically polarized surfaces are identified whose moduli stack is Deligne-Mumford, a property that does not hold in general in positive characteristic.

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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