Journal
EUROPEAN PHYSICAL JOURNAL B
Volume 32, Issue 4, Pages 429-436Publisher
SPRINGER
DOI: 10.1140/epjb/e2003-00121-8
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The grand potential of a system of interacting electrons is considered as a stationary point of a self-energy functional. It is shown that a rigorous evaluation of the functional is possible for self-energies that are representable within a certain reference system. The variational scheme allows to construct new non-perturbative and thermodynamically consistent approximations. Numerical results illustrate the practicability of the method.
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