A Talk on 3d Matter Coupled to Chern-Simons Field, Spontaneous Breaking of Scale Invariance, and Fermion-Boson Mapping

Abstract

The singlet sector of vector, large $N$, 3d field theory corresponds to Vasiliev higher spin theory on $Ad{S}_4$. Will discuss three dimensional $U(N)$ symmetric field theory with fermion and boson matter coupled to a topological Chern-Simons field. In the presence of a marginal deformation will determine the conditions for the existence of a phase with spontaneous breaking of scale invariance. In this phase the ground state contains massive $U(N)$ quanta and a massless $U(N)$ singlet bound state goldstone boson:~the Dilaton. Will show that such a phase appears only in the presence of a marginal deformation. The massless Dilaton appears in the spectrum provided certain relations between coupling constants are satisfied. Will discuss the fermion-boson mapping and show that the conditions for spontaneous breaking of scale invariance in the boson and fermion theories are copies of each other.

arXiv commentTalk presented at the 2019 Meeting of the Division of Particles and Fields of the American Physical Society (DPF2019), July 29 - August 2, 2019, Northeastern University, Boston, C1907293