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arXiv 2103.02180math.AG
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皮卡德数为2的光滑射影曲面上的有界上同调性质

Bounded cohomology property on a smooth projective surface with Picard number two

Sichen Li

AI总结:

该研究针对皮卡德数为2的光滑射影曲面,在给定闭Mori锥结构的条件下,证明了当满足小平维数不超过1,或小平维数为2且非正则性为0、饭高维数为1时,曲面满足有界上同调性质。

摘要:

若存在正常数$c_X$,使得$X$上的每个素除子$C$都满足$h^1(\mathcal O_X(C))\n\le c_Xh^0(\n\mathcal O_X(C))$,则称光滑射影曲面$X$满足有界上同调性质。设闭Mori锥(森锥)$\n\mathrm{NE}(X)=\n\mathbb R_{\n\ge0}[C_1]+\n\mathbb R_{\n\ge0}[C_2]$,其中$C_1$、$C_2$是$X$上的曲线且$C_2^2<0$。我们证明:若满足(i)小平维数$κ(X)\n\le1$,或(ii)$κ(X)=2$、非正则性$q(X)=0$且饭高维数$κ(X,C_1)=1$,则$X$满足有界上同调性质。

英文摘要:

We say a smooth projective surface $X$ satisfies the bounded cohomology property if there exists a positive constant $c_X$ such that $h^1(\mathcal O_X(C))\le c_Xh^0(\mathcal O_X(C))$ for every prime divisor $C$ on $X$. Let the closed Mori cone $\mathrm{NE}(X)=\mathbb R_{\ge0}[C_1]+\mathbb R_{\ge0}[C_2]$ such that $C_1$ and $C_2$ with $C_2^2<0$ are some curves on $X$. If either (i) the Kodaira dimension $κ(X)\le1$ or (ii) $κ(X)=2$, the irregularity $q(X)=0$ and the Iitaka dimension $κ(X,C_1)=1$, then we prove that $X$ satisfies the bounded cohomology property.

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