GAUGE-FIELDS ON RIEMANN-CARTAN SPACE-TIMES

Gauge fields are described on a Riemann-Cartan space-time by means of tensor-valued differential forms and exterior calculus. It is shown th at minimal coupling procedure leads to a gauge invariant theory where gauge fields interact with torsion, and that consistency conditions fo r the gauge fields impose restrictions in the non-Riemannian structure of space-time. The new results differ from the well established ones obtained by using minimal coupling procedure at the action formulation . The sources of these differences are pointed out and discussed.