  Momentum dependent local-ansatz (MLA) wavefunction describes accurately
electron correlations from the weak to intermediate Coulomb interaction
regimes. We point out that the MLA can describe the correlations from the weak
to strong Coulomb interaction regimes by modifying the starting wavefunction
from the Hartree-Fock (HF) type to an alloy-analogy (AA) type wavefunction.
Numerical results based on the half-filled band Hubbard model on the hypercubic
lattice in infinite dimensions show up that the new wavefunction yields the
ground-state energy lower than the Gutzwiller wavefunction (GW) in the whole
Coulomb interaction regime. Calculated double occupation number is smaller than
the result of the GW in the metallic regime, and is finite in the insulator
regime. Furthermore, the momentum distribution shows a distinct
momentum-dependence in both the metallic and insulator regions, which are
qualitatively different from those of the GW.
