Charged Boson Gas at High Density
Abstract
The groundstate 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 tworing 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.
 Publication:

Physical Review
 Pub Date:
 April 1967
 DOI:
 10.1103/PhysRev.156.204
 Bibcode:
 1967PhRv..156..204B