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arXiv 0710.3072math.AGmath.ACmath.CO
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重言丛表示曲面上点的Hilbert概型的上同调

Cohomology of the Hilbert scheme of points on a surface with values in representations of tautological bundles

Luca Scala

摘要:

设$X$为光滑拟射影代数曲面,$L$为$X$上的线丛.设$X^{[n]}$为$X$上$n$点的Hilbert概型,$L^{[n]}$为自然地与$X$上的线丛$L$相关联的$X^{[n]}$上的重言式丛。我们根据$\B{D}^b_{\perm_n}(X^n)$中$\perm_n$ -等变层的复$\comp{\mc{C}}_L$,显式地计算了Bridgeland-King-Reid等价$\bkrh : \B{D}^b(X^{[n]}) \ra \B{D}^b_{\perm_n}(X^n)$的重言丛$L^{[n]}$的象$\bkrh(L^{[n]})$。此外,我们给出了一个表征的图像$\bkrh(L^{[n]} \tens ... \tens L^{[n]})$的超衍生光谱序列$E^{p,q}_1$相关的衍生$k$倍张量功率的复杂$\comp{\mc{C}}_L$。研究这个谱序列的$\perm_n$ -不变量,可以得到希尔伯特-周态射重言丛的双张量幂和广义$k$ -折叠外幂的直接图像,在这两种情况下提供Danila-Brion型公式。这就很容易计算出$X^{[n]}$的上同调,其值在$L^{[n]} \tens L^{[n]}$和$Λ^k L^{[n]}$中。

英文摘要:

Let $X$ a smooth quasi-projective algebraic surface, $L$ a line bundle on $X$. Let $X^{[n]}$ the Hilbert scheme of $n$ points on $X$ and $L^{[n]}$ the tautological bundle on $X^{[n]}$ naturally associated to the line bundle $L$ on $X$. We explicitely compute the image $\bkrh(L^{[n]})$ of the tautological bundle $L^{[n]}$ for the Bridgeland-King-Reid equivalence $\bkrh : \B{D}^b(X^{[n]}) \ra \B{D}^b_{\perm_n}(X^n)$ in terms of a complex $\comp{\mc{C}}_L$ of $\perm_n$-equivariant sheaves in $\B{D}^b_{\perm_n}(X^n)$. We give, moreover, a characterization of the image $\bkrh(L^{[n]} \tens ... \tens L^{[n]})$ in terms of of the hyperderived spectral sequence $E^{p,q}_1$ associated to the derived $k$-fold tensor power of the complex $\comp{\mc{C}}_L$. The study of the $\perm_n$-invariants of this spectral sequence allows to get the derived direct images of the double tensor power and of the general $k$-fold exterior power of the tautological bundle for the Hilbert-Chow morphism, providing Danila-Brion-type formulas in these two cases. This yields easily the computation of the cohomology of $X^{[n]}$ with values in $L^{[n]} \tens L^{[n]}$ and $Λ^k L^{[n]}$.

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