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arXiv 1905.09366math.AGmath.CV
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亏格为五的Jacobian的零θ的Schottky问题

On the Schottky problem for genus five Jacobians with a vanishing theta null

Daniele Agostini, Lynn Chua

摘要:

我们给出了一个解决方案的弱Schottky问题的亏格5雅可比族与消失的θ零,回答了一个问题的Grushevsky和Salvati曼尼。更确切地说,我们表明,如果一个主要极化的阿贝尔簇的五个维度有一个消失的θ零与二次正切锥的秩最多为3,那么它是在雅可比轨迹,额外的不可约组件。我们采用退化的参数,连同研究的分歧轨迹高斯地图的θ因子。

英文摘要:

We give a solution to the weak Schottky problem for genus five Jacobians with a vanishing theta null, answering a question of Grushevsky and Salvati Manni. More precisely, we show that if a principally polarized abelian variety of dimension five has a vanishing theta null with a quadric tangent cone of rank at most three, then it is in the Jacobian locus, up to extra irreducible components. We employ a degeneration argument, together with a study of the ramification loci for the Gauss map of a theta divisor.

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