The standard Hartree-Fock approximation of the O(N)-invariant Ï•4 model suffers from serious renormalization problems. In addition, when the symmetry is spontaneously broken, another shortcoming appears in relation to the Goldstone bosons: they fail to be massless in the intermediate states. In this work, within the framework of out-of-equilibrium Quantum Field Theory, we propose a class of systematic improvements of the Hartree-Fock resummation which overcomes all the above mentioned difficulties while ensuring also exact Renormalization-Group invariance to one loop. © 2006 The American Physical Society.

Destri, C., Sartirana, A. (2006). Improved Hartree--Fock resummations and spontaneous symmetry breaking. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, PHYSICAL REVIEW D 73, 025012 (2006) [10.1103/PhysRevD.73.025012].

Improved Hartree--Fock resummations and spontaneous symmetry breaking

DESTRI, CLAUDIO;
2006

Abstract

The standard Hartree-Fock approximation of the O(N)-invariant Ï•4 model suffers from serious renormalization problems. In addition, when the symmetry is spontaneously broken, another shortcoming appears in relation to the Goldstone bosons: they fail to be massless in the intermediate states. In this work, within the framework of out-of-equilibrium Quantum Field Theory, we propose a class of systematic improvements of the Hartree-Fock resummation which overcomes all the above mentioned difficulties while ensuring also exact Renormalization-Group invariance to one loop. © 2006 The American Physical Society.
Articolo in rivista - Articolo scientifico
Quantum field theory
English
Destri, C., Sartirana, A. (2006). Improved Hartree--Fock resummations and spontaneous symmetry breaking. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, PHYSICAL REVIEW D 73, 025012 (2006) [10.1103/PhysRevD.73.025012].
Destri, C; Sartirana, A
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/4499
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