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arXiv 2609.03171math.NT

亏格3超椭圆曲线雅可比矩阵上ℓ-挠点的分解模式与定义域域

Factorization patterns and fields of definition of $\ell$-torsion points on the Jacobians of genus 3 hyperelliptic curves

Amalia Pizarro-Madariaga, Edgardo Riquelme

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中文总结 AI 辅助

该研究针对有限域上亏格3超椭圆曲线雅可比矩阵的ℓ-挠点问题,通过分析Frobenius作用的若尔当分解,将ℓ-挠点定义域次数的界从O(ℓ⁶)改进到O(ℓ⁴),并建立了ℓ-挠子群秩与伽罗瓦轨道的对应关系。

中文摘要 AI 辅助

受Schoof-Pila型点计数算法的启发,我们研究了有限域上亏格3超椭圆曲线雅可比矩阵上ℓ-挠点伽罗瓦轨道的定义域域与分解模式。我们证明ℓ-挠点定义域域的次数可被限制在O(ℓ⁴),改进了此前预期的O(ℓ⁶)界(该界反映了ℓ-挠子群的大小,亏格3雅可比矩阵的ℓ-挠子群阶为ℓ⁶)。此外,我们建立了ℓ-挠子群的秩与ℓ-挠除子的伽罗瓦轨道之间的精确对应关系。我们的方法依赖于对Frobenius作用在J上的若尔当分解及其幂零部分的详细分析。

英文摘要

Motivated by Schoof-Pila-type point-counting algorithms, we study the fields of definition and factorization patterns of Galois orbits of $\ell$-torsion points on the Jacobians of genus-3 hyperelliptic curves over finite fields. We show that the degree of the field of definition of the $\ell$-torsion points can be bounded by $O(\ell^4)$, improving the previously expected $O(\ell^6)$ bound (which reflects the size of the $\ell$-torsion subgroup, of order $\ell^6$ for a genus 3 Jacobian). Moreover, we establish a precise correspondence between the rank of the $\ell$-torsion subgroup and the Galois orbits of $\ell$-torsion divisors. Our approach relies on a detailed analysis of the Jordan decomposition of the Frobenius action on $J$ and its nilpotent part.

发表机构

  • Instituto de Matemáticas, Universidad del Valparaíso(瓦尔帕莱索大学数学研究所)
  • Departamento de Ciencias Básicas, Universidad del Bío-Bío(比奥比奥大学基础科学系)

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