Automorphic functions for the Whitehead-link-complement group

Abstract

We construct automorphic functions on the real $3$-dimensional hyperbolic space $\mathbb{H}^3$ for the Whitehead-link-complement group $W\subset \mathit{GL}_2(\mathbb{Z}[i])$ and for a few groups commensurable with $W$. These automorphic functions give embeddings of the orbit spaces of $\mathbb{H}^3$ under these groups, and arithmetical characterizations of them.