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A hierarchy of equations for finite temperature Green functions

Research output: Contribution to journalJournal article

Published

Journal publication date1/10/1981
JournalPhysica Status Solidi (B)
Journal number2
Volume107
Number of pages7
Pages435-441
Original languageEnglish

Abstract

Employing a new theorem on time ordered products of operators, an infinite hierarchy of equations for the finite temperature Green functions of a many particle system is obtained. The analysis provides a basis for the extension to finite temperatures of recent results from ground state perturbation theory. The connection between the present analysis and the corresponding ground state formalism is briefly discussed.