An Upper Bound on the Number of Classes of Perfect Unary Forms in Totally Real Number Fields

Abstract

Let $K$ be a totally real number field of degree $n$ over $\mathbb{Q}$, with discriminant and regulator ${\Delta }_K,R_K$ respectively. In this paper, using a similar method to van Woerden, we prove that the number of classes of perfect unary forms, up to equivalence and scaling, can be bounded above by $O({\Delta }_K\exp (2n\log (n)+f(n,R_K)))$, where $f(n,R_K)$ is a finite value, satisfying $f(n,R_K)=\frac{\sqrt{n-1}}{2}{R}_K^{\frac{1}{n-1}}+\frac{4}{n-1}\log (\sqrt{|{\Delta }_K|}{)}^2$ if $n\le 11$. Moreover, if $K$ is a unit reducible field, the number of classes of perfect unary forms is bound above by $O({\Delta }_K\exp (2n\log (n)))$.

8 pages