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A quantum mechanical particle which moves in a symmetric double-well potential, and whose interaction with the environment is described in the classical regime by a phenomenological friction coefficient, is considered. It is shown that, provided {{q₀}^2} exceeds a critical value of order unity (q₀ are the locations of the potential minima), the mean rate of tunneling between the degenerate minima decreases with temperature, leading at T=0 to spontaneous symmetry breaking.
Bray et al. (Mon,) studied this question.
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