Quantum Brownian Motion: The Functional Integral Approach
Grabert H., Schramm P., Ingold G.-L.
The quantum mechanical dynamics of a particle coupled to a heat bath is treated by functional integral methods and a generalization of the Feynman-Vemon influence functional is derived. The extended theory describes the time evolution of nonfactorizing initial states and of equilibrium correlation functions. The theory is illuminated through exactly solvable models.
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