In recent years I've been following three threads of developments:
1. Applications of string theory, as a model of strongly coupled quantum field theories, to the physics of QCD and of condensed matter systems.
2. Foundations of string Theory: Matrix Theory, AdS/CFT, black hole physics, time dependence in string theory.
3. Helicity amplitudes.
My research has also benefitted increasingly from the use of numerical simulations, mostly to solve systems of non-linear partial differential equations resulting from the study of Einstein equations in context relevant to holography.
More detailed information can be found in my list of publications.