Charged Boson Gas at High Density
1967; American Institute of Physics; Volume: 156; Issue: 1 Linguagem: Inglês
10.1103/physrev.156.204
ISSN1536-6065
Autores Tópico(s)Physics of Superconductivity and Magnetism
ResumoThe ground-state energy of a charged boson gas at high density is evaluated exactly to second order in the density expansion, making use of complete sums of one- and two-ring diagrams. The result agrees numerically with Feenberg's variational calculation of the energy, although the methods appear to be substantially different. The presence of logarithmic terms in the energy, which are absent in the exact result, is shown to be a result of truncation of the Hamiltonian in the pair approximation or of inadequacies of variational wave functions which omit interpair correlations.
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