Flow Equations and Normal Ordering. A Survey

Details Flow Equations and Normal Ordering. A Survey Flow Equations and Normal Ordering. A Survey

2005-11-28

arxiv.org/abs/cond-mat/0511660v1

Physics

Condensed Matter

Statistical Mechanics

11 pages, contribution to the workshop on the Renormalization Group, Helsinki 2005

Scientific paper

10.1088/0305-4470/39/25/S29

First we give an introduction to the method of diagonalizing or block-diagonalizing continuously a Hamiltonian and explain how this procedure can be used to analyze the two-dimensional Hubbard model. Then we give a short survey on applications of this flow equation on other models. Finally we outline, how symmetry breaking can be introduced by means of a symmetry breaking of the normal ordering, not of the Hamiltonian.

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