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arXiv 1102.4291math.NT
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关于高阶$π/3$和$2π/3$ -同余数椭圆曲线

On the high rank $π/3$ and $2π/3$-congruent number elliptic curves

Ali S. Janfada, Sajad Salami, andrej Dujella, Juan C. Peral

摘要:

考虑由$ E_{n,θ}:\quad y^2=x^3+2s n x^2-(r^2-s^2) n^2 x $给出的椭圆曲线,其中$0 < θ< π$,$\cos(θ)=s/r$是有理数,具有$0\leq |s| <r$和$\gcd (r,s)=1$。这些椭圆曲线与$θ$ -同余数问题有关,作为同余数问题的推广.对于固定的$θ$这个家庭对应于二次扭曲的$n$的曲线$E_θ: \,\, y^2=x^3+2s x^2-(r^2-s^2) x.$我们研究了两个特殊情况$θ=π/3$和$θ=2π/3$。我们已经发现了一个$n=n(w)$的一个子家族的秩至少为$3$以上的${\mathbb Q}(w)$和一个子家族的秩$4$参数化的椭圆曲线的点具有正秩。我们还发现了$n$的例子,在这两种情况下,$E_{n, θ}$的排名都超过了$\mathbb Q$。

英文摘要:

Consider the elliptic curves given by $ E_{n,θ}:\quad y^2=x^3+2s n x^2-(r^2-s^2) n^2 x $ where $0 < θ< π$, $\cos(θ)=s/r$ is rational with $0\leq |s| <r$ and $\gcd (r,s)=1$. These elliptic curves are related to the $θ$-congruent number problem as a generalization of the congruent number problem. For fixed $θ$ this family corresponds to the quadratic twist by $n$ of the curve $E_θ: \,\, y^2=x^3+2s x^2-(r^2-s^2) x.$ We study two special cases $θ=π/3$ and $θ=2π/3$. We have found a subfamily of $n=n(w)$ having rank at least $3$ over ${\mathbb Q}(w)$ and a subfamily with rank $4$ parametrized by points of an elliptic curve with positive rank. We also found examples of $n$ such that $E_{n, θ}$ has rank up to $7$ over $\mathbb Q$ in both cases.

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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