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arXiv 1005.3201math.AG
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有理曲面上纯层的模空间上的行列式线丛与奇异对偶

Determinant line bundles on Moduli spaces of pure sheaves on rational surfaces and Strange Duality

Yao Yuan

摘要:

设$\mhu$是光滑复射影曲面$X$上$u$类半稳定纯层的模空间。我们指定$u=(0,L,χ(u)=0),$,即$u$中的层具有维度$1$。从模空间$\mhu$到线性系统$\ls$存在自然态射$π$。本文通过$π.$研究了$\mhu$上的一系列行列式线丛$\lcn$表示$\ls.$中曲线的算术亏格$g_L$对于任意的$X$和$g_L\leq0$,我们计算生成函数$Z^r(t)=\sum_{n}h^0(\mhu,\lcn)t^n$ .对于$X$是$\mathbb{P}^2$或具有$e=0,1$的$\mathbb{P}(\mo_{\pone}\oplus\mo_{\pone}(-e))$,我们计算$g_L>0$的$Z^1(t)$和所有$r$和$g_L=1,2$的$Z^r(t)$。我们的结果提供了一个数值检查奇怪的对偶在这些特定的情况下,连同Göttsche的计算。此外,我们还得到了积分曲线紧化雅可比矩阵理论中的一个有趣的推论。

英文摘要:

Let $\mhu$ be the moduli space of semi-stable pure sheaves of class $u$ on a smooth complex projective surface $X$. We specify $u=(0,L,χ(u)=0),$ i.e. sheaves in $u$ are of dimension $1$. There is a natural morphism $π$ from the moduli space $\mhu$ to the linear system $\ls$. We study a series of determinant line bundles $\lcn$ on $\mhu$ via $π.$ Denote $g_L$ the arithmetic genus of curves in $\ls.$ For any $X$ and $g_L\leq0$, we compute the generating function $Z^r(t)=\sum_{n}h^0(\mhu,\lcn)t^n$. For $X$ being $\mathbb{P}^2$ or $\mathbb{P}(\mo_{\pone}\oplus\mo_{\pone}(-e))$ with $e=0,1$, we compute $Z^1(t)$ for $g_L>0$ and $Z^r(t)$ for all $r$ and $g_L=1,2$. Our results provide a numerical check to Strange Duality in these specified situations, together with Göttsche's computation. And in addition, we get an interesting corollary in the theory of compactified Jacobian of integral curves.

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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