  First a review is given of Riemann-Cartan space-time and Einstein-Cartan
gravity. This gives us the necessary tools to handle the SO(2,3) Yang-Mills
gauge theory for gravity. New here is the derivation of the conservation laws.
Finally possible solutions of the field equations are discussed. They depend on
the scale of the de Sitter length. Solutions to the anti-de Sitter field
equations are given in the case of a Schwarzschild and FRW-geometry.
