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- W2055701077 abstract "We present a way of combining real-time path integral Monte Carlo simulations with a maximum entropy numerical analytic continuation scheme in a new approach for calculating time correlation functions for finite temperature many body quantum systems. The real-time dynamics is expressed in the form of the symmetrized time correlation function, which is suitable for Monte Carlo methods, and several simulation techniques are presented for evaluating this function accurately up to moderate values of time. The symmetrized time correlation function is then analytically continued in combination with imaginary time data to obtain the real-time correlation function. We test this approach on several exactly solvable problems, including two one-dimensional systems, as well two cases of vibrational relaxation of a system coupled to a dissipative environment. The computed time correlation functions are in good agreement with exact results over several multiples of the thermal time βℏ, and exhibit a significant improvement over analytic continuation of imaginary time correlation functions. Moreover, we show how the method can be systematically improved." @default.
- W2055701077 created "2016-06-24" @default.
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- W2055701077 date "2001-01-15" @default.
- W2055701077 modified "2023-10-16" @default.
- W2055701077 title "Quantum time correlation functions from complex time Monte Carlo simulations: A maximum entropy approach" @default.
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- W2055701077 doi "https://doi.org/10.1063/1.1331613" @default.
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