Title: Orientifold, geometric transition and large <i>N</i> duality for SO/Sp gauge theories
Abstract: We extend the large N duality of four dimensional = 1 supersymmetric Yang-Mills theory with additional chiral fields and arbitrary superpotential recently proposed by Cachazo, Intriligator and Vafa to the case of SO/Sp gauge groups. By orientifolding the geometric transition, we investigate a large N duality between = 1, SO/Sp supersymmetric theories with arbitrary superpotential and an abelian = 2 theory with supersymmetry broken to = 1 by electric and magnetic Fayet-Iliopoulos terms.