Diagonalization of full finite temperature Green's function by quasi-particles

Details Diagonalization of full finite temperature Green's function by quasi-particles Diagonalization of full finite temperature Green's function by quasi-particles

1993-04-08

arxiv.org/abs/nucl-th/9304006v1

Phys.Lett. B303 (1993) 209-214

Physics

Nuclear Physics

Nuclear Theory

9 pages in standard LaTeX

Scientific paper

10.1016/0370-2693(93)91421-I

For thermal systems, standard perturbation theory breaks down because of the
absence of stable, observable asymptotic states. We show, how the introduction
of {\it 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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