Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2006-10-29
Phys. Rev. E 75, 041113 (2007)
Physics
Condensed Matter
Statistical Mechanics
Minimal correction of some typos found during proof reading. Accepted for publication in Phys. Rev. E
Scientific paper
10.1103/PhysRevE.75.041113
The hierarchical reference theory (HRT) and the self-consistent Ornstein-Zernike approximation (SCOZA) are two liquid state theories that both furnish a largely satisfactory description of the critical region as well as the phase coexistence and equation of state in general. Furthermore, there are a number of similarities that suggest the possibility of a unification of both theories. Earlier in this respect we have studied consistency between the internal energy and free energy routes. As a next step toward this goal we here consider consistency with the compressibility route too, but we restrict explicit evaluations to a model whose exact solution is known showing that a unification works in that case. The model in question is the mean spherical model (MSM) which we here extend to a generalized MSM (GMSM). For this case, we show that the correct solutions can be recovered from suitable boundary conditions through either of SCOZA or HRT alone as well as by the combined theory. Furthermore, the relation between the HRT-SCOZA equations and those of SCOZA and HRT becomes transparent.
Hoye Johan S.
Reiner Albert
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