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A hierarchy of equations for finite temperature Green functions

Research output: Contribution to Journal/MagazineJournal articlepeer-review

<mark>Journal publication date</mark>1/10/1981
<mark>Journal</mark>physica status solidi (b)
Issue number2
Number of pages7
Pages (from-to)435-441
Publication StatusPublished
<mark>Original language</mark>English


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.