Summary: arXiv:hep­lat/0109024
v2
16
Oct
2001
1
Spectral function at high temperature 
HD-THEP-01-39
Gert Aarts a
a Institut fur theoretische Physik, Universitat Heidelberg,
Philosophenweg 16, 69120 Heidelberg, Germany
For a weakly coupled quantum eld at high temperature the classical approximation oers a possibility to
gain insight into nonperturbative real-time dynamics. I use this to present a nonperturbative approach to the
computation of spectral functions in real time. Results are shown for a scalar eld in 2 + 1 dimensions.
1. In thermal equilibrium spectral functions
contain all available information since other real-
(and imaginary-) time correlators are related to
them via the KMS condition. A nonperturbative
computation of spectral functions seems therefore
desirable; nonperturbative in order to:

Source: Aarts, Gert - Department of Physics, University of Wales Swansea

Collections: Physics