- Black holes
- Particle Physics
- String Theory
My main research interests are in M-theory, the nonperturbative version of string theory. The extended objects in M-theory are membranes and five-branes. They are related to strings and D-branes in string theory via dimensional reduction. Over the last few years my research has been devoted to understanding the interactions of these branes. Mainly this is through studying how membranes end on fivebranes.
My other interests over the years have been varied and include: Holography and the AdS/CFT coresspondence; noncommutative geometry; and S-duality in gauge theories. Recently I have been interested in backgrounds to string theory that are intrinsically stringy in origin and not just solutions to supergravity; these go by the name of T-folds.