Abstract
An auxiliary system is defined by adiabatic connection. In the ground state the diagonal of the spin-independent second-order density matrix n can be determined by solving a single auxiliary equation of a two-particle problem. Thus the problem of an arbitrary system with even electrons can be reduced to a two-particle problem. The effective potential of the two-particle equation contains a term of completely kinetic origin.
- Received 18 March 2002
DOI:https://doi.org/10.1103/PhysRevA.66.022505
©2002 American Physical Society
