Relation between the Brueckner-Frohberg and Nosanow Cluster Expansions
- 5 February 1968
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 166 (1) , 177-180
- https://doi.org/10.1103/physrev.166.177
Abstract
We demonstrate the existence of a relation between the partial sums of the cluster expansion derived by Brueckner and Frohberg in their treatment of quantum crystals, and the partial sums of the expansion obtained by Nosanow for the same problem. Such a relation was found for a particular special case by Hetherington, Mullin, and Nosanow, and we show that with certain refinements their result holds for the general term.Keywords
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