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arXiv 1105.3449math.AG
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大$q$ -充足的线丛

Big $q$-ample Line Bundles

Morgan V Brown

摘要:

Totaro最近的一篇论文发展了特征为0的$q$ -样本丛理论。具体地说,$X$上的线丛$L$是$q$ -例如,如果对于$X$上的每个相干层$\mathcal{F}$,存在整数$m_0$,使得$m\geq m_0$对于$i>q$暗示$H^i(X,\mathcal{F}\otimes \mathcal{O}(mL))=0$。证明了复射影概型$X$上的线丛$L$是$q$ -充足的当且仅当$L$对其增广基轨迹的限制是$q$ -充足的.特别地,当$X$是一个簇并且$L$很大但不是$q$ -样本时,则存在$X$的余维1子模式$D$,使得$L$到$D$的限制不是$q$ -样本。

英文摘要:

A recent paper of Totaro develops a theory of $q$-ample bundles in characteristic 0. Specifically, a line bundle $L$ on $X$ is $q$-ample if for every coherent sheaf $\mathcal{F}$ on $X$, there exists an integer $m_0$ such that $m\geq m_0$ implies $H^i(X,\mathcal{F}\otimes \mathcal{O}(mL))=0$ for $i>q$. We show that a line bundle $L$ on a complex projective scheme $X$ is $q$-ample if and only if the restriction of $L$ to its augmented base locus is $q$-ample. In particular, when $X$ is a variety and $L$ is big but fails to be $q$-ample, then there exists a codimension 1 subscheme $D$ of $X$ such that the restriction of $L$ to $D$ is not $q$-ample.

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