Progress of Theoretical Physics
Stability Condition of the Hartree-Fock States against Four-Body Correlations
K. Suzuki
Abstract
The stability condition of the Hartree-Fock states against the four-body correlations is discussed and formulated in the framework of the new Tamm-Dancoff approximation extended to the four-particle scattering eigenmode. Important contributions of the pair-scattering interactions to the stability problem are asserted. Finally, the conclusion of the instability of the Hartree-Fock state is deduced.