Predicted strongcoupling product dictions of the simple Jaynes-Cummings model for light-matter interactions. Direct modification of polariton ground states can be caused by two physical processes: 1,9,29 (i) off-resonance light-matter interactions (third term in Eq. 2) through the ground state permanent dipole and optical transition dipoles between the ground and excited states, and (ii) a dipole self-energy term. The detailed theoretical arguments are provided in the Theoretical Methods section below Eq. 2.