Coupled cluster techniques and the Rabi Hamiltonian

The Rabi Hamiltonian is a simple, yet non-trivial model of light-matter interactions. Here we present a brief review of the application of the normal coupled cluster method (NCCM) to this model. We concentrate on the NCCM description of the excitation spectrum and of simple time evolutions of the system, providing a link between the two that limits the accuracy of NCCM dynamical calculations in practice.