Conserving approximations vs Two-Particle Self-Consistent Approach

Details Conserving approximations vs Two-Particle Self-Consistent Approach Conserving approximations vs Two-Particle Self-Consistent Approach

2001-10-07

arxiv.org/abs/cond-mat/0110130v2

in "Theoretical Methods for Strongly Correlated Electrons", p. 341, Eds. David S\'en\'echal, Andr\'e-Marie Tremblay, Claude Bo

Physics

Condensed Matter

Strongly Correlated Electrons

RevTex, corrected typos, updated references, as published version

Scientific paper

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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