Abstract
A new variational cluster-expansion derivation of Guyer's theory of the ground state of a quantum crystal is presented. The results are identical with his in the two-body correlation approximation except that the variational approach provides a justification of the minimization technique used to choose the unperturbed Hamiltonian. The treatments differ in the higher correlation terms because of the use of a Jastrow trial function.
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References
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Supported in part by Office of Naval Research contract No. N0001467-A-0230-003.
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Mullin, W.J. New derivation of a theory of quantum crystals. J Low Temp Phys 4, 135–140 (1971). https://doi.org/10.1007/BF00628386
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DOI: https://doi.org/10.1007/BF00628386