2 research outputs found
The (1+1)-dimensional Massive sine-Gordon Field Theory and the Gaussian Wave-functional Approach
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.Comment: Latex, 11 pages, 8 figures (EPS files
Restoration and Dynamical Breakdown of the \phi \to -\phi Symmetry in the (1+1)-dimensional Massive sine-Gordon Field Theory
Within the framework of the Gaussian wave-functional approach, we investigate
the influences of quantum and finite-temperature effects on the
Z_2-symmetry(\phi \to -\phi) of the (1+1)-dimensional massive sine-Gordon field
theory. It is explicitly demonstrated that by quantum effects the Z_2-symmetry
can be restored in one region of the parameter space and dynamically
spontaneously broken in another region. Moreover, a finite-temperature effect
can further restore the Z_2-symmetry only.Comment: 12 pages, 14 figures (EPS