Aspects of Supersymmetric Gauge Theory and String Theory

In the first part of this thesis we study some topics in N=1 supersymmeric gauge theory and the relation to matrix models. We review the relevant non-perturbative techniques for computing effective superpotential, such as Seiberg-Witten curve. Then we review the proposal of Dijkgraaf and Vafa that relates the glueball superpotentials to the computation in matrix models. We then consider a case of multi-trace superpotential. We perform the perturbative computation of glueball superpotential in this case and explain the subtlety in identifying the glueball superfield. We also use these techniques to study phases of N=1 gauge theory with flavors. In the second part we study topics in AdS/CFT correspondence and its plane wave limit. We review the plane wave geometry and BMN operators that corresponding to string modes. Then we study string interactions in the case of a highly curved plane wave background, and demonstrate the agreements between calculations of string interaction amplitudes in the two dual theories. Finally we study D3-brane giant gravitons and open string attached to them. Giant gravitons are non- perturbative objects that have very large R-charge. Dr. Minxin Huang obtained his Ph.D. degree at the University of Pennsylvania. Then he worked as a postdoctoral researcher at the University of Wisconsin, Madison and as a research fellow at European Organization for Nuclear Research (CERN). He have worked on diverse topics in string theory and particle physics.