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arXiv 1401.1340math.NT
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二次型的n点相关性

The n-point correlation of quadratic forms

Oliver Sargent

摘要:

本文研究了二次型Q_i的值集在整点处的分布。特别是,我们感兴趣的是这个集合的n点相关性。给出了计数函数的渐近性质,该函数计数整数点$\left(v_{1},\dots,v_{n}\right)$的n元组的个数,且范数有界,使得n-1个差分$Q\left(v_{1}\right)-Q\left(v_{2}\right),\dots Q\left(v_{n-1}\right)-Q\left(v_{n}\right)$位于规定的区间内.只要该二次型的秩不小于5,不是有理型的倍数,且n不大于该二次型的秩,则上述结果是有效的.对于某些满足丢番图条件的二次型,我们得到了极限的速率。这些证明是以F. G $ö$ tze和G.马古利斯,他们在其中证明了奥本海猜想的一个“有效”版本。特别是,证明依赖于傅里叶分析和某些θ级数的估计。

英文摘要:

In this paper we investigate the distribution of the set of values of a quadratic form Q, at integral points. In particular we are interested in the n-point correlations of the this set. The asymptotic behaviour of the counting function that counts the number of n-tuples of integral points $\left(v_{1},\dots,v_{n}\right)$, with bounded norm, such that the n-1 differences $Q\left(v_{1}\right)-Q\left(v_{2}\right),\dots Q\left(v_{n-1}\right)-Q\left(v_{n}\right)$, lie in prescribed intervals is obtained. The results are valid provided that the quadratic form has rank at least 5, is not a multiple of a rational form and n is at most the rank of the quadratic form. For certain quadratic forms satisfying Diophantine conditions we obtain a rate for the limit. The proofs are based on those in the recent preprint ([G-M]) of F. G$ö$tze and G. Margulis, in which they prove an `effective' version of the Oppenheim Conjecture. In particular, the proofs rely on Fourier analysis and estimates for certain theta series.

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