Excited States of the Double sine-Gordon Model1 1The project supported by National Natural Science Foundation of China

Abstract

Using the Gaussian wave functional as variational ground state, we study the excited states of the double sine-Gordon model in dimensions. We find, i) for there exist two particle bound states, their energy decreases with increasing coupling; ii) also for , the phase shift of the two-particle scattering state is always positive; iii) for the investigation on the interaction between the particles shows that the theory is trivial.