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Within the framework of the Gaussian wave-functional approach, we investigatethe influences of quantum and finite-temperature effects on theZ_2-symmetry(\phi \to -\phi) of the (1+1)-dimensional massive sine-Gordon fieldtheory. It is explicitly demonstrated that by quantum effects the Z_2-symmetrycan be restored in one region of the parameter space and dynamicallyspontaneously broken in another region. Moreover, a finite-temperature effectcan further restore the Z_2-symmetry only.Comment: 12 pages, 14 figures (EPS

Restoration and breakdown of the ϕ→-ϕ symmetry in the (1+1)-dimensional massive sine-Gordon field theory by quantum and finite-temperature effects