Quantum Brownian motion: The functional integral approach. Grabert, H., Schramm, P., & Ingold, G. Physics Reports, 168(3):115–207, October, 1988.
Quantum Brownian motion: The functional integral approach [link]Paper  doi  abstract   bibtex   
The quantum mechanical dynamics of a particle coupled to a heat bath is treated by functional integral methods and a generalization of the Feynman-Vernon 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.
@article{grabert_quantum_1988,
	title = {Quantum {Brownian} motion: {The} functional integral approach},
	volume = {168},
	issn = {0370-1573},
	shorttitle = {Quantum {Brownian} motion},
	url = {http://www.sciencedirect.com/science/article/pii/0370157388900233},
	doi = {10.1016/0370-1573(88)90023-3},
	abstract = {The quantum mechanical dynamics of a particle coupled to a heat bath is treated by functional integral methods and a generalization of the Feynman-Vernon 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.},
	number = {3},
	urldate = {2014-10-16},
	journal = {Physics Reports},
	author = {Grabert, Hermann and Schramm, Peter and Ingold, Gert-Ludwig},
	month = oct,
	year = {1988},
	pages = {115--207}
}

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