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arXiv 1808.01441math.NT
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全实数域中整系数泛二次型秩的一个下界

A lower bound for the rank of a universal quadratic form with integer coefficients in a totally real number field

Pavlo Yatsyna

摘要:

我们证明了,如果$K$是一个单演的,原始的,全实数域,其中包含每个签名的单位,那么存在一个下界的秩定义在$K$的整数泛二次型。特别是,我们扩展了Blomer和Kala的工作,证明了存在无穷多个完全实立方数域,它们没有一个给定秩的通用二次型。对于单位范数为负的实二次数域,证明了泛二次型的最小秩随数域判别式的增长而趋于无穷大。这些结果来自于对交错多项式的研究。具体来说,我们表明,只有1000多个不可约的首一多项式有关的原始数字段的一个给定的程度,有界数量的交错多项式。

英文摘要:

We show that if $K$ is a monogenic, primitive, totally real number field, that contains units of every signature, then there exists a lower bound for the rank of integer universal quadratic forms defined over $K$. In particular, we extend the work of Blomer and Kala, to show that there exist infinitely many totally real cubic number fields that do not have a universal quadratic form of a given rank defined over them. For the real quadratic number fields with a unit of negative norm, we show that the minimal rank of a universal quadratic form goes to infinity as the discriminant of the number field grows. These results follow from the study of interlacing polynomials. Specifically, we show that there are only finitely many irreducible monic polynomials related to primitive number fields of a given degree, that have a bounded number of interlacing polynomials.

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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