%0 Journal Article
%T The (1+1)-dimensional Massive sine-Gordon Field Theory and the Gaussian Wave-functional Approach
%A Wen-Fa Lu
%J Physics
%D 1998
%I arXiv
%R 10.1103/PhysRevD.59.105021
%X The ground, one- and two-particle states of the (1+1)-dimensional massive sine-Gordon field theory are investigated within the framework of the Gaussian wave-functional approach. We demonstrate that for a certain region of the model-parameter space, the vacuum of the field system is asymmetrical. Furthermore, it is shown that two-particle bound state can exist upon the asymmetric vacuum for a part of the aforementioned region. Besides, for the bosonic equivalent to the massive Schwinger model, the masses of the one boson and two-boson bound states agree with the recent second-order results of a fermion-mass perturbation calculation when the fermion mass is small.
%U http://arxiv.org/abs/hep-th/9804047v2