  In this paper we consider a model for gravity in 4-dimensional space-time
originally proposed by Chamseddine, which may be derived by dimensional
reduction and truncation from a 5-dimensional Chern-Simons theory. Its
topological origin makes it an interesting candidate for an easier
quantization, e.g., in the Loop Quantization framework. The present paper is
dedicated to a classical analysis of the model's properties. Cosmological
solutions as well as wave solutions are found and compared with the
corresponding solutions of Einstein's General Relativity with cosmological
constant.
