# Theoretical Methods For Strongly Correlated Electrons

 Title Theoretical Methods For Strongly Correlated Electrons Publication Type Book Chapter Year of Publication 2004 Authors Allen, S, Tremblay, A-MS, Vilk, YM Editor Sénéchal, D, Tremblay, A-MS, Bourbonnais, C Chapter Conserving approximations vs. two-particle self-consistent approach Pagination 341–355 Publisher Springer Abstract 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. Full Text