Minimization procedure in reduced density matrix functional theory by   means of an effective noninteracting system
  In this work, we propose a self-consistent minimization procedure for functionals in reduced density matrix functional theory. We introduce an effective noninteracting system at finite temperature which is capable of reproducing the groundstate one-reduced density matrix of an interacting system at zero temperature. By introducing the concept of a temperature tensor the minimization with respect to the occupation numbers is shown to be greatly improved. 
Tim Baldsiefen, E. K. U. Gross
cond-mat.other quant-ph