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arXiv 2103.00074math.NT
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有限域上Lattès映射的周期点的稠密性

Density of Periodic Points for Lattès maps over Finite Fields

Zoë Bell, Jasmine Camero, Karina Cho, Trevor Hyde, Chieh-Mi Lu, Rebecca Miller, Bianca Thompson, Eric Zhu

摘要:

令$L_d$是与定义在有限域$\mathbb{F}_q$上的椭圆曲线$E$的乘$d$自同态相关联的Lattès映射。我们确定了$\mathbb{P}^1(\mathbb{F}_q)$中$L_d$的周期点的密度$δ(L_d,q)$。证明了周期点密度$δ(L_d,q^n)$沿一定的算术级数收敛为$n \rightarrow \infty$,并计算了当$\ell$是素数且$E$属于一类特殊的超奇异椭圆曲线时$δ(L_\ell,q)$的简单显式公式.

英文摘要:

Let $L_d$ be the Lattès map associated to the multiplication-by-$d$ endomorphism of an elliptic curve $E$ defined over a finite field $\mathbb{F}_q$. We determine the density $δ(L_d,q)$ of periodic points for $L_d$ in $\mathbb{P}^1(\mathbb{F}_q)$. We show that the periodic point densities $δ(L_d,q^n)$ converge as $n \rightarrow \infty$ along certain arithmetic progressions, and compute simple explicit formulas for $δ(L_\ell,q)$ when $\ell$ is a prime and $E$ belongs to a special family of supersingular elliptic curves.

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