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arXiv math/9803097math.NTmath.AG
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有限域上根全在单位圆上的实多项式和阿贝尔簇

Real polynomials with all roots on the unit circle and abelian varieties over finite fields

Stephen A. DiPippo, Everett W. Howe

摘要:

本文通过研究根均位于单位圆上的2n次一次实多项式集合,证明了关于有限域上的阿贝尔簇簇的几个定理。特别地,我们考虑R^n中的向量集合V_n,它们给出了这样的多项式的系数。我们计算了V_n的体积,找到了V_n的一个大的易描述子集。利用这些结果,我们得到了F_q上n维阿贝尔簇的等距类个数的一个带显式误差项的渐近公式.当n>1时,F_q上的n维阿贝尔簇的群阶集合包含以q^n+1为中心的长度约为q^{n-1/2}的区间内的所有整数.我们计算V_n的体积涉及到对单形{(x_1,...,x_n)|0 < x_1 <. < x_n < 1},其中e_i是正实数,其第(i,j)项是x_j^{e_i-1}的n × n矩阵的行列式。

英文摘要:

In this paper we prove several theorems about abelian varieties over finite fields by studying the set of monic real polynomials of degree 2n all of whose roots lie on the unit circle. In particular, we consider a set V_n of vectors in R^n that give the coefficients of such polynomials. We calculate the volume of V_n and we find a large easily-described subset of V_n. Using these results, we find an asymptotic formula --- with explicit error terms --- for the number of isogeny classes of n-dimensional abelian varieties over F_q. We also show that if n>1, the set of group orders of n-dimensional abelian varieties over F_q contains every integer in an interval of length roughly q^{n-1/2} centered at q^n+1. Our calculation of the volume of V_n involves the evaluation of the integral over the simplex {(x_1,...,x_n) | 0 < x_1 < ... < x_n < 1} of the determinant of the n-by-n matrix whose (i,j)th entry is x_j^{e_i-1}, where the e_i are positive real numbers.

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