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Exactness of two-body cluster expansions in many-body quantum theory
Piotr Piecuch1, Karol Kowalski, Peng-Dong Fan
1Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA. piecuch@cem.msu.edu
Physical Review Letters
|April 12, 2003
Abstract:
The Horn-Weinstein formula and the variational principle, combined with numerical results for a few many-electron systems, are used to provide support for a conjecture that the exact ground-state wave function for a Hamiltonian system containing up to two-body terms may be represented by an exponential cluster expansion employing a finite two-body operator.