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Published January 1, 1981 | public
Journal Article Open

Mean-field approximation for inclusive observables


The excitation of a many-body system by a one-body perturbation is considered. The stationary phase approximation to a functional-integral representation of the many-body evolution operator shows that the optimal mean field for describing the final expectation values of one- and two-body operators is that given by the time-dependent Hartree-Fock method. The forced Lipkin model is considered as a test of the mean-field approximation.

Additional Information

©1981 The American Physical Society Received 2 September 1980 This work was supported in part by the National Science Foundation (PHY77-21602 and PHY79-23638). Y. Alhassid is a Chaim Weizmann Postdoctoral Fellow and S.E. Koonin is an Alfred P. Sloan Foundation Fellow.


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