Restoration and Dynamical Breakdown of the ϕ\to -ϕSymmetry in the (1+1)-dimensional Massive sine-Gordon Field Theory

Abstract

Within the framework of the Gaussian wave-functional approach, we investigate the influences of quantum and finite-temperature effects on the Z_2-symmetry(ϕ\to -ϕ) 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.

12 pages, 14 figures (EPS)

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• Rayleigh-Schrödinger Perturbation Theory Based on Gaussian Wavefunctional Approch