String Theory along with other approaches to Quantum Gravity is one of the important directions of research of the iPhT.

The main activity of the laboratory in this area covers string theory in time-dependent background and the associated Liouville models, c = 1 and large-N matrix models, various aspects of the AdS-CFT correspondence and the integrability of N = 4 gauge theories, the compactifications of string theory, the structure of N = 1 and N = 2 low energy limits and their relation with pure spinor formalism and Hitchin functionals, Logarithmic conformal field theory, conformal field theory on non compact and or super target spaces, integrable field theories, applications of field theory to condensed matter.