Exactness of two-body cluster expansions in many-body quantum theory.
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.
Piecuch
Piotr
P
Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA. piecuch@cem.msu.edu
Kowalski
Karol
K
Fan
Peng-Dong
PD
Jedziniak
Krzysztof
K