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Real Time Correlation Functions at Finite Temperature and their Classical Limit

D. B"odeker
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Abstract

In order to investigate the reliability of the classical approximation for non-perturbative real time correlation functions at finite temperature we study the two-point correlator for the anharmonic oscillator. For moderately large times the classical limit gives a good approximation of the quantum result but after some time $t_*$ the classical approximation breaks down even at high temperature.

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D. B"odeker. 1997-08-15. Real Time Correlation Functions at Finite Temperature and their Classical Limit. https://arxiv.org/abs/hep-ph/9708360

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