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29 March 2024
 
  » arxiv » hep-ph/0502146

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Gapless Hartree-Fock Resummation Scheme for the O(N) Model
Yu. B. Ivanov ; F. Riek ; J. Knoll ;
Date 16 Feb 2005
Journal Phys.Rev. D71 (2005) 105016
Subject High Energy Physics - Phenomenology; Other | hep-ph cond-mat.other nucl-th
Affiliation1 and 2), F. Riek , J. Knoll ( Kurchatov Institute, Darmstadt, GSI
AbstractA 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.
Source arXiv, hep-ph/0502146
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