1. The large $N$ limit of superconformal field theories and supergravity
2. Gauge theory correlators from non-critical string theory
3. Anti de Sitter space and holography
4. For a review, see O. Aharony, S.S. Gubser, J. Maldacena, H. Ooguri, Y. Oz, Large N Field Theories, String Theory and Gravity, hep-th/9905111.
5. G. Gibbons, P.K. Townsend, Black holes and Calogero models, hep-th/9812034.