Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1997-05-14
Nucl.Phys. B513 (1998) 445-470
Physics
High Energy Physics
High Energy Physics - Phenomenology
28 pages, 7 figures
Scientific paper
10.1016/S0550-3213(98)00696-8
We study non-perturbative real time correlation functions at finite temperature. In order to see whether the classical term gives a good approximation in the high temperature limit T >> \hbar\omega, we consider the first \hbar^2 quantum corrections. We find that for the simplest non-trivial case, the quantum mechanical anharmonic oscillator, the classical result is reliable only for moderately large times: after some time t_* the classical approximation breaks down even at high temperatures. Moreover, the result for the first quantum corrections cannot, in general, be reproduced by modifying the parameters of the classical theory.
Bodeker Dietrich
Laine Mikko
Philipsen Owe
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