Dirac Type Operators for Arithmetic Subgroups of Generalized Modular Groups

Fundamental solutions of Dirac type operators are introduced for a class of conformally flat manifolds. This class consists of manifolds obtained by factoring out the upper half-space of ${\mathbb{R}}^n$ by arithmetic subgroups of generalized modular groups. Basic properties of these fundamental solutions are presented together with associated Eisenstein and Poincar'e type series.