Abstract:We revisit the external source method for Kubo-transformed quantum correlation functions recently proposed by Krishna and Voth. We derive an exact formula and show that the Krishna-Voth formula can be derived as an approximation of our formula. Some properties of this approximation are clarified through a model calculation of the position autocorrelation function for a onedimensional harmonic oscillator. A key observation is that the Krishna-Voth correlation function has a term which behaves as the secular ter… Show more
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