An effective method based on the Hubbard-Schofield approach [Phys. Lett. A 40, 245
(1972)] is developed to calculate the free energy of classical Coulomb systems. This method …

A trial solution constructed from two-body functions is applied to a variational treatment of
the many-body problem with strong forces. The expectation value of the energy for Bose …

The generalized coupled-cluster (CC) method of the preceding paper is cast into the form of
the Brueckner-Hartree-Fock (BHF) method. In this approach the model vacuum Φ is …

Recently, general equations for the ground state energy were derived, which are based on
the use of cumulants and which are suitable for various approximation schemes, eg …

A method of calculating expectation values and transition moments within the framework of
the generalized coupled-cluster (CC) method is described. This approach allows for a direct …

Calculational procedures are developed for the ground-state energy of a many-fermion
system. The entire theory is developed from the many-body Schrödinger equation via …

Abstract The Heitler-London method based on nonorthogonal atomic orbitals is applied to
arrays of an infinitely large number of atoms. The electronic energy is given by a quotient …

The Coulomb pair density matrix is essential in numerical quantum mechanical studies of
Coulombic systems. The properties of the pair density matrix in two and three dimensions for …

A relativistic Fock-space coupled cluster theory based on the Dirac—Coulomb—Breit
wavefunctions has been developed and implemented, employing analytic basis sets of …

In a recent paper by Ichikawa, 1) the long range correlation effects of Coulomb interaction
are shown to increase the free ener-gy of the Debye-Huckellimiting law by 22%. If this is …