Abstract
We consider N=1 supersymmetric SU( N c ) gauge theories, using the type IIB brane construction recently proposed by Hanany and Zaffaroni. At non-zero string coupling, we find that the bending of branes imposes consistency conditions that allow only non-anomalous gauge theories with stable vacua, i.e., N f ≥ N c , to be constructed. We find qualitative differences between the brane configurations for N f ≤3 N c and N f >3 N c , corresponding to asymptotically free and infrared free theories respectively. We also discuss some properties of the brane configurations that may be relevant to constructing Seiberg's duality in this framework.
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