Bullough–Dodd model

The Bullough–Dodd model is an integrable model in 1+1-dimensional quantum field theory introduced by Robin Bullough and Roger Dodd. Its Lagrangian density is

where m 0 is a mass parameter, g is the coupling constant and ϕ is a real scalar field.

The Bullough–Dodd model belongs to the class of Affine Toda Field Theories.

The spectrum of the model consists of a single massive particle.