- th / 9 30 40 06 v 1 8 A pr 1 99 3 Diagonalization of full finite temperature Green ’ s functions by quasi - particles
نویسندگان
چکیده
For thermal systems, standard perturbation theory breaks down because of the absence of stable, observable asymptotic states. We show, how the introduction of statistical quasi-particles (stable, but not observable) gives rise to a consistent description. Statistical and spectral information can be cleanly separated also for interacting systems.
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تاریخ انتشار 1993