GAUGINO CONDENSATION AND THE ANOMALOUS U(1)

We study gaugino condensation in presence of an anomalous U(1) gauge g roup and find that global supersymmetry is dynamically broken, An exam ple of particular interest is provided by effective string models with 4-dimensional Green-Schwarz anomaly cancellation mechanism. The struc ture of the hidden sector is constrained by the anomaly cancellation c onditions and the scale of gaugino condensation is shifted compared wi th the usual case. We explicitly compute the resulting soft supersymme try breaking terms.