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arXiv 1609.04002math.NT
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数域上二元形式的广义divisor和

Generalised divisor sums of binary forms over number fields

Christopher Frei, Efthymios Sofos

摘要:

估计Dirichlet卷积$1 \ast χ$的平均值,对于一些固定模的实Dirichlet字符$χ$,在定义在$\mathbb{Z}$上的二进制形式的值的稀疏集合上,近年来一直是广泛的研究的焦点,与壮观的应用Manin的猜想Châtelet曲面。我们引入了一个意义深远的概括这个问题,特别是取代$χ$的Jacobi符号与参数具有不同的大小,可能趋于无穷大。本文的主要结果提供了相应平均值的期望数量级的渐近估计和下界。所有这些都是通过采用专用于$1\ast 1$的Daniel技术在任意数字字段上执行的。这是第一次在除$\mathbb{Q}$以外的任何数域上对二进制形式的值的除数和进行渐近计算。我们的工作是一个关键步骤的证明,在随后的工作中,预测的下界的Manin猜想所有德尔佩佐表面在所有数域,根据温和的假设皮卡德数。

英文摘要:

Estimating averages of Dirichlet convolutions $1 \ast χ$, for some real Dirichlet character $χ$ of fixed modulus, over the sparse set of values of binary forms defined over $\mathbb{Z}$ has been the focus of extensive investigations in recent years, with spectacular applications to Manin's conjecture for Châtelet surfaces. We introduce a far-reaching generalization of this problem, in particular replacing $χ$ by Jacobi symbols with both arguments having varying size, possibly tending to infinity. The main results of this paper provide asymptotic estimates and lower bounds of the expected order of magnitude for the corresponding averages. All of this is performed over arbitrary number fields by adapting a technique of Daniel specific to $1\ast 1$. This is the first time that divisor sums over values of binary forms are asymptotically evaluated over any number field other than $\mathbb{Q}$. Our work is a key step in the proof, given in subsequent work, of the lower bound predicted by Manin's conjecture for all del Pezzo surfaces over all number fields, under mild assumptions on the Picard number.

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