Efficient description of strongly correlated electrons with mean-field   cost
  We present an efficient approach to the electron correlation problem that is well-suited for strongly interacting many-body systems, but requires only mean-field-like computational cost. %which is based on orbital optimization of electron pairs. The performance of our approach is illustrated for the one-dimensional Hubbard model with periodic boundary conditions for different chain lengths, and for the non-relativistic quantum chemical Hamiltonian exploring the symmetric dissociation of the H$_{50}$ hydrogen chain. 
Katharina Boguslawski, Pawe{\l} Tecmer, Paul W. Ayers, Patrick   Bultinck, Stijn De Baerdemacker, Dimitri Van Neck
cond-mat.str-el physics.chem-ph