皮卡秩1的阿贝尔簇上经线过滤的秩2 ACM丛
Line-filtered rank-two ACM bundles on abelian varieties of Picard rank one
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中文总结 AI 辅助
针对皮卡秩1的维数≥2的复阿贝尔簇,分类其上空亏格的秩2算术Cohen-Macaulay丛,明确其结构形式并证明这些丛均非Ulrich丛。
中文摘要 AI 辅助
设A为维数g≥2的复阿贝尔簇,其Néron-Severi群NS(A)同构于由丰富类L生成的整数群。我们在不计L的幂次扭转的情况下,对A上空亏格的秩2算术Cohen-Macaulay(ACM)丛进行分类:它们是两个ACM线丛的直和,或是非平凡零次线丛的非拆分自扩张;我们还证明这些丛均非Ulrich丛。
英文摘要
Let $A$ be a complex abelian variety of dimension $g\ge 2$ with $\NS(A)\cong\ZZ$ generated by an ample class $L$. We classify, up to twist by powers of $L$, the rank-two arithmetically Cohen--Macaulay bundles on $A$ with empty defect: they are sums of two ACM line bundles or nonsplit self-extensions of a nontrivial degree-zero line bundle. We also show none is Ulrich.