String Theory Journal Club

A large class of two-dimensional quantum fields theories contain an interesting operator built from the stress tensor, called "TT-bar". Due to "TT-bar" many physically interesting quantities can be computed exactly and explicitly in terms of the data from the undeformed theory, such as the S-matrix and the finite-volume spectrum. In my talk I will give a short introduction to the "TT-bar" deformations. I discuss some examples of applications of "TT-bar".