Gapless Hartree-Fock Resummation Scheme for the O(N) Model

Details Gapless Hartree-Fock Resummation Scheme for the O(N) Model Gapless Hartree-Fock Resummation Scheme for the O(N) Model

2005-02-16

arxiv.org/abs/hep-ph/0502146v2

Phys.Rev. D71 (2005) 105016

Physics

High Energy Physics

High Energy Physics - Phenomenology

13 pages, 10 figures / Version accepted by Phys. Rev. D: the introduction has been expanded by a few remarks in order to furth

Scientific paper

10.1103/PhysRevD.71.105016

A modified selfconsistent Hartree-Fock approximation to the lambda*phi^4 theory with spontaneously broken O(N) symmetry is proposed. It preserves all the desirable features, like conservation laws and thermodynamic consistency, of the selfconsistent Dyson scheme generated from a 2PI functional, also known as the Phi-derivable scheme, while simultaneously respecting the Nambu-Goldstone theorem in the chiral-symmetry broken phase. Various approximate resummation schemes are discussed.

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