Bondi-Metzner-Sachs bootstrap

We initiate a study of the bootstrap program for field theories with Bondi-Metzner-Sachs (BMS) symmetry. Specifically, we look at two-dimensional field theories with BMS3 symmetry, and using the highest weight representations we construct the BMS bootstrap equation by formulating the notion of crossing symmetry in the four-point functions of these field theories. In the limit of large central charge, we find analytic expressions for the BMS blocks that are the basic ingredients for the solution of the bootstrap equation. This constitutes, to the best of our knowledge, the first example of the formulation and significant steps toward the solution of a bootstrap equation in a theory which is not a relativistic conformal field theory.