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- W1991451575 abstract "For many fermions with arbitrary two-body forces we investigate the effective action Г[ϱ, α] where ϱ is the density matrix including pair correlations and α is the four-particle vertex. The physical state including all radiative corrections is obtained by extremizing Г[ϱ, α] with respect to ϱ and α. Just as ϱ ≠ 0 corresponds to non-zero density and condensation of pairs, α ≠ 0 signals the presence of a condensate of four-particle clusters. A simple loop expansion is given for Г[ϱ, α]. To lowest order, the extremum amounts to the Hartree-Fock-Bogoliubov equations. The next two steps bring in the four-particle condensate." @default.
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- W1991451575 date "1981-07-01" @default.
- W1991451575 modified "2023-09-26" @default.
- W1991451575 title "Field theory of collective excitations III condensation of four-particle clusters" @default.
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- W1991451575 doi "https://doi.org/10.1016/0375-9601(81)90756-8" @default.
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