The density of rational points on ${\mathbb{P}}^1$ with three stacky points

Abstract

In this paper we consider the density of rational points on the "stacky" curve $\mathcal{X}({\mathbb{P}}^1;0,2;1,2;\infty ,2)$ which is ${\mathbb{P}}^1$ with three half points, with respect to the so-called Ellenberg-Satriano-Zuerick-Brown height. In particular, we prove a conjecture of Ellenberg.