Phys. Rev. A 66, 022505 (2002) [5 pages]Density-matrix functional theoryReceived 18 March 2002; published 27 August 2002 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. © 2002 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.66.022505
DOI:
10.1103/PhysRevA.66.022505
PACS:
31.15.Ew
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