Average STDHF (ASTDHF)
Basic Theory
ASTDHF is a simplification of STDHF in which the ensemble of propagated « pure » (in statistical physics terms) mean field states is replaced by one single « mixed » directly integrating correlations. The reduction implies a single associated mean field and thus loss of mean field fluctutaions but gain of the (costly) propagation of the various mean fields. Correlations are computed « a la STDHF » by reconstituting occasionnally an instantaneous STDHF ensemble. This implies representing the mixed state by an ensemble of pure states for computing correlations which in particular allows to reconstruct many-body density matrices at any order, just as in STDHF.
Example of application
Excellent agreement between ASTDHF and STDHF
