Restoration and Dynamical Breakdown of the ϕ -ϕSymmetry in the (1+1)-dimensional Massive sine-Gordon Field Theory
Wen-Fa Lu
Abstract
Within the framework of the Gaussian wave-functional approach, we investigate the influences of quantum and finite-temperature effects on the Z2-symmetry(ϕ -ϕ) of the (1+1)-dimensional massive sine-Gordon field theory. It is explicitly demonstrated that by quantum effects the Z2-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 Z2-symmetry only.
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