Maximal number of skew lines on Fermat surfaces

Abstract

It is well known that the Fermat surface of degree $d\ge 3$ has $3d^2$ lines. However, it has not yet been established what is the maximal number of pairwise disjoint lines that it can have if $d\ge 4$. In this article, we show that the maximal number of skew lines on the Fermat surface of degree $d\ge 4$ is $3d$, either $d$ even or $d$ odd distinct of 5, otherwise ($d=5$) it contains no more than 13 pairwise disjoint lines.