Flow Equations and Normal Ordering

Abstract

In this paper we consider flow-equations where we allow a normal ordering which is adjusted to the one-particle energy of the Hamiltonian. We show that this flow converges nearly always to the stable phase. Starting out from the symmetric Hamiltonian and symmetry-broken normal ordering nearly always yields symmetry breaking below the critical temperature.

7 pages

References in corpus (5)

• Renormalization Group Approach to Interacting Fermions
• Renormalization group analysis of the 2D Hubbard model
• Renormalization group flows into phases with broken symmetry
• Pomeranchuk and other Instabilities in the t-t' Hubbard model at the Van Hove Filling
• Possible Phases of the Two-Dimensional t-t' Hubbard Model

Cited by in corpus (5)

• A driven similarity renormalization group approach to quantum many-body problems
• Spectral signatures of the BCS-BEC crossover in the excitonic insulator phase of the extended Falicov-Kimball model
• Flow Equations and Normal Ordering. A Survey
• Renormalized quark-antiquark Hamiltonian induced by a gluon mass ansatz in heavy-flavor QCD
• Generalized diagonalization scheme for many-particle systems