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arXiv 2211.12866math.AG
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双有理对合

A birational involution

Pietro Beri, Laurent Manivel

AI总结:

本文基于格理论预测并利用Mukai模型与例外群作用描述了18次K3曲面Hilbert立方的反辛双有理对合,证明其不定轨迹与同调射影对偶性相关,并得出该对合是Mukai flop实例的结论。

摘要:

给定一般的18次K3曲面S,格理论考虑允许预测Hilbert立方$S^{[3]}$存在一个反辛双有理对合$ϕ$。我们借助例外群$G_2(R)$在六维球面上的著名传递作用,用S的Mukai模型描述了该对合。通过证明该对合的不定轨迹双有理等价于二次对偶K3曲面上的$P^2$-丛,我们建立了与Homological Projective Duality的联系。由此推导出$ϕ$是Mukai flop的一个实例。

英文摘要:

Given a general K3 surface S of degree 18, lattice theoretic considerations allow to predict the existence of an anti-symplectic birational involution $ϕ$ of the Hilbert cube $S^{[3]}$. We describe this involution in terms of the Mukai model of $S$, with the help of the famous transitive action of the exceptional group $G_2(R)$ on the six-dimensional sphere. We make a connection with Homological Projective Duality by showing that the indeterminacy locus of the involution is birational to a $P^2$-bundle over the dual K3 surface of degree two. We deduce that $ϕ$ is an instance of a Mukai flop.

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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