Abstract
The finite-temperature properties of the damped one-dimensional quantum sine-Gordon model are investigated by using the semiclassical approximation. The renormalization of the phonon mass and the soliton density is calculated. It is found that the dissipative effect changes the low-temperature behaviors of these equilibrium properties by suppressing quantum fluctuations. The dynamic response function is obtained. The limit of applicability of the theory and its relation to other classical and quantum theories are discussed.
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