Research PapersNo Access
ENTROPY IN SCALAR O(N) MODEL WITH A SPONTANEOUSLY BROKEN SYMMETRY
https://doi.org/10.1142/S0217751X09047363Cited by:6 (Source: Crossref)
Abstract
We investigate the entropy in a scalar O(N) model with a spontaneously broken symmetry. The Cornwall–Jackiw–Tomboulis formalism is applied to derive the entropy in the Hartree and Hartree–Fock approximations. In contrast to the Hartree approximation where the particles are quasiparticles with vanishing decay width, the Hartree–Fock approximation contains exchange contributions, which lead to nonzero decay width. We find that the sunset diagrams contribution is very small. Furthermore, the decay widths from these diagrams are discussed in the weak and strong coupling cases.
PACS: 65.40.Gr, 12.38.Mh, 11.30.Qc, 05.30.Jp
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