  We show that the leading term in the strong-interaction limit of the
adiabatic connection that has as weak-interaction expansion the Moeller-Plesset
perturbation theory can be fully determined from a functional of the
Hartree-Fock density. We analyze this functional and highlight similarities and
differences with the strong-interaction limit of the density-fixed adiabatic
connection case of Kohn-Sham density functional theory.
