arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1003.4333math.AGmath.AC
收藏

关于测试理想在有限态射下的行为

On the behavior of test ideals under finite morphisms

Karl Schwede, Kevin Tucker

摘要:

我们导出了素特征$p > 0$正规簇的任意有限满射$π: Y \to X$下的测试理想和$F$ -奇点的变换规则.主要的技术是将同态$F_{*} O_{X} \to O_{X}$,如Frobenius分裂,与同态$F_{*} O_{Y} \to O_{Y}$联系起来。在最简单的情况下,这些规则反映了特征为零的乘子理想的变换规则。作为推论,我们导出了迹是满射的充分条件,即$Tr_{Y/X}(π_{*}O_{Y}) = O_{X}$ .

英文摘要:

We derive transformation rules for test ideals and $F$-singularities under an arbitrary finite surjective morphism $π: Y \to X$ of normal varieties in prime characteristic $p > 0$. The main technique is to relate homomorphisms $F_{*} O_{X} \to O_{X}$, such as Frobenius splittings, to homomorphisms $F_{*} O_{Y} \to O_{Y}$. In the simplest cases, these rules mirror transformation rules for multiplier ideals in characteristic zero. As a corollary, we deduce sufficient conditions which imply that trace is surjective, i.e. $Tr_{Y/X}(π_{*}O_{Y}) = O_{X}$.

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。

↑