I was working on string theory and supersymmetric field theories. Now I am interested in the AdS/CFT correspondence which is thought to be a useful tool for studying unknown properties of string theory. Recently I was studying a certain class of operators called non-local operators. I proposed their gravity duals and showed complete agreement between gauge and gravity theories.

Recently, I am considering a system consisting of D3 branes and probe D-branes. This system gives a special gauge theory which contains defects or boundaries. Using this system, I am thinking of revealing relations between these non-local operators and brane configurations.