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arXiv 1303.6513math.NTmath.DS
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z^d + c轨道中素数的密度

The density of primes in orbits of z^d + c

Spencer Hamblen, Rafe Jones, Kalyani Madhu

摘要:

给定整体域K上的多项式f(z)= z^d + c和K中的a_0,研究了K的素理想在f下至少整除a_0的轨道的一个元素的稠密性.线性多项式的这种集合的密度吸引了大量的研究,第二作者研究了几个二次多项式家族,但在高次情况下知之甚少。我们表明,对于许多选择的d和c,这个密度是零的所有a_0,假设K包含一个原始的dth单位根。证明依赖于几个新的结果,包括一些确保f的第n阶不可约因子的数量随着n的增长而保持有界,以及其他关于迭代扩展中某些素数以上的分支的结果。当K是一个全局函数域或K=Q(zeta_d)时,这些函数一起允许几乎完整的信息。

英文摘要:

Given a polynomial f(z) = z^d + c over a global field K and a_0 in K, we study the density of prime ideals of K dividing at least one element of the orbit of a_0 under f. The density of such sets for linear polynomials has attracted much study, and the second author has examined several families of quadratic polynomials, but little is known in the higher-degree case. We show that for many choices of d and c this density is zero for all a_0, assuming K contains a primitive dth root of unity. The proof relies on several new results, including some ensuring the number of irreducible factors of the nth iterate of f remains bounded as n grows, and others on the ramification above certain primes in iterated extensions. Together these allow for nearly complete information when K is a global function field or when K=Q(zeta_d).

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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