Conserving approximations vs Two-Particle Self-Consistent Approach
Allen, S. · Tremblay, A. -M. S. · Vilk, Y. M.
Original · EN
The conserving approximation scheme to many-body problems was developed by Kadanoff and Baym using the functional-derivative approach. Another approach for the Hubbard model also satisfies conservation laws, but in addition it satisfies the Pauli principle and a number of sum rules. A concise formal derivation of that approach, using functional derivatives, is given in this conference paper to highlight formal analogies and differences with conserving approximations.
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