arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2008.10095math.AGmath.CVmath.DSmath.NT
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有理映射临界轨道关系族的无穷远点方程

Equations at infinity for critical-orbit-relation families of rational maps

Rohini Ramadas, Rob Silversmith

摘要:

我们开发的技术,使用紧化的Hurwitz空间来研究家庭的合理的映射$\mathbb{P}^1\to\mathbb{P}^1$定义的临界轨道关系。我们应用这些技术在两个设置:我们表明,度$d$双临界映射的参数空间$\mathrm{Per}_{d,n}$与一个标记的4-周期临界点是$d^2$穿刺黎曼曲面的属$\frac{(d-1)(d-2)}{2}$。我们还证明了具有5周期临界点的2次有理映射的参数空间$\mathrm{Per}_{2,5}$是一条10-穿孔椭圆曲线,并证明了它在$\mathbb{Q}$上的同构类。我们进行了实验研究的动态定义的点之间的相互作用的$\mathrm{Per}_{2,5}$(如PCF点或穿孔)和基础的椭圆曲线的组结构。

英文摘要:

We develop techniques for using compactifications of Hurwitz spaces to study families of rational maps $\mathbb{P}^1\to\mathbb{P}^1$ defined by critical orbit relations. We apply these techniques in two settings: We show that the parameter space $\mathrm{Per}_{d,n}$ of degree-$d$ bicritical maps with a marked 4-periodic critical point is a $d^2$-punctured Riemann surface of genus $\frac{(d-1)(d-2)}{2}$. We also show that the parameter space $\mathrm{Per}_{2,5}$ of degree-2 rational maps with a marked 5-periodic critical point is a 10-punctured elliptic curve, and we identify its isomorphism class over $\mathbb{Q}$. We carry out an experimental study of the interaction between dynamically defined points of $\mathrm{Per}_{2,5}$ (such as PCF points or punctures) and the group structure of the underlying elliptic curve.

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