Vector valued modular forms on three dimensional ball

Abstract

Cl\'ery and van der Geer determined generators for some modules of vector valued Picard modular forms on the two dimensional ball. In this paper we consider the case of a three dimensional ball with the action of the Picard modular group $\Gamma_3[\sqrt{-3}]$. The corresponding modular variety of dimension 3 is a copy of the Segre cubic.