Abstract
A method for estimating expectation values formed with Jastrow wave functions for quantum solids is developed on the basis of the correlated-particles expansion (CPE), which follows from an exact relationship for canonical thermodynamic averages. As a test of the CPE, we obtain estimates for the ground-state energy of fcc solid /sup 4/He with a van der Waals interatomic potential and a 1/r/sup 5/ effective potential. When the CPE is used through second order, the differences between the kinetic and potential energies obtained and the Monte Carlo values range from 0.2% to 21%. For comparison, the differences between the cluster expansion estimates and the Monte Carlo values range from 18% to 42%.
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