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Dynamics of Many-Body Correlation Green's Functions II. Equal Time Limit

Ang S

Published Jan 1, 1992• 0 citations
OpenAlex

Abstract

Under equal time limit, it is shown that the dynamic equations of the n-body correlation Green's functions G_c~(n) leads to the set of equations for time evolution of the n-body correlations c_n and the many-body correlation Green's functions and their equations of motion are independent of the time order.

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In this paper some new physical notations are given for the Green's functions and equations of motion (EOM) in many body physics with the concept of quasiparticles. It shows how the many body correlations existing in many body systems can be taken into account through the derivation of EOMs self-consistently. The scheme is compared with the expansion of Feynman diagrams. Finally some further discussions are given for the unique properties of EOM techniques in helping to model a system and the interactions self-consistently.
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