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arXiv 0705.2184math.AG
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与三次曲面相关的秩为6的向量丛模空间

A remarkable moduli space of rank 6 vector bundles related to cubic surfaces

Fabrizio Catanese, Fabio Tonoli

摘要:

本文研究了$\PP^3$上的单秩6向量丛$\E$的模空间$\fM^s(6;3,6,4)$,并利用陈多项式$1+3t+6t^2+4t^3$研究了这类丛的性质,特别是证明了关于其稳定性的部分结果.我们首先回忆一下这些丛是如何与PDMATHAMO中的六次节点曲面的构造相关的,该曲面具有56个节点的偶数集(参见。\cite{CaTo})。我们证明了存在一个开集,对应于具有最小上同调的单丛,它是19维不可约的,并且是G.I.T.通过$SL(W)\times SL(U)$的自然作用,证明了$(3,3,4)$型三重张量的射影空间$\fB:=\{B\in \PP(U^\vee\otimes W\otimes V^\vee)\}$的商空间。我们给出了这些丛的几种构造,它们与3-空间$\PP^3$中的三次曲面和对偶空间$(\PP^3)^{\vee}$中的三次曲面相联系。伊戈尔·多尔加乔夫(Igor Dolgachev)提出的这些构造之一,推广到其他类型的张量。此外,我们涉及到所谓的{ \em交叉积对合}的$(3,3,4)$张量,在\cite{CaTo},与Schur二次曲面相关联的一个三次曲面在$\PP^3$和研究进一步的性质,这种对合。

英文摘要:

We study the moduli space $\fM^s(6;3,6,4)$ of simple rank 6 vector bundles $\E$ on $\PP^3$ with Chern polynomial $1+3t+6t^2+4t^3$ and properties of these bundles, especially we prove some partial results concerning their stability. We first recall how these bundles are related to the construction of sextic nodal surfaces in $\PP^3$ having an even set of 56 nodes (cf. \cite{CaTo}). We prove that there is an open set, corresponding to the simple bundles with minimal cohomology, which is irreducible of dimension 19 and bimeromorphic to an open set $\fA^0$ of the G.I.T. quotient space of the projective space $\fB:=\{B\in \PP(U^\vee\otimes W\otimes V^\vee)\}$ of triple tensors of type $(3,3,4)$ by the natural action of $SL(W)\times SL(U)$. We give several constructions for these bundles, which relate them to cubic surfaces in 3-space $\PP^3$ and to cubic surfaces in the dual space $(\PP^3)^{\vee}$. One of these constructions, suggested by Igor Dolgachev, generalizes to other types of tensors. Moreover, we relate the socalled {\em cross-product involution} for $(3,3,4)$-tensors, introduced in \cite{CaTo}, with the Schur quadric associated to a cubic surface in $\PP^3$ and study further properties of this involution.

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