External Source Method for Kubo-Transformed Quantum Correlation Functions
Quantum Physics
2014-01-08 v1 Statistical Mechanics
Chemical Physics
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 one-dimensional harmonic oscillator. A key observation is that the Krishna-Voth correlation function has a term which behaves as the secular term in perturbation theory.
Keywords
Cite
@article{arxiv.1401.0983,
title = {External Source Method for Kubo-Transformed Quantum Correlation Functions},
author = {Atsushi Horikoshi},
journal= {arXiv preprint arXiv:1401.0983},
year = {2014}
}
Comments
8 pages, 1 figure