A new on-shell 3-to-3 collision integral for identical fermions is derived, and model calculations find it reduces nuclear matter relaxation times by up to a factor 3 versus two-body collisions alone.
Density-matrix formalism with three-body ground-state correlations
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abstract
A density-matrix formalism which includes the effects of three-body ground- state correlations is applied to the standard Lipkin model. The reason to consider the complicated three-body correlations is that the truncation scheme of reduced density matrices up to the two-body level does not give satisfactory results to the standard Lipkin model. It is shown that inclusion of the three-body correlations drastically improves the properties of the ground states and excited states. It is pointed out that lack of mean-field effects in the standard Lipkin model enhances the relative importance of the three-body ground-state correlations. Formal aspects of the density-matrix formalism such as a relation to the variational principle and the stability condition of the ground state are also discussed. It is pointed out that the three-body ground-state correlations are necessary to satisfy the stability condition.
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Quantum correlation dynamics and in-medium 3$\leftrightarrow$3 collisions of fermions
A new on-shell 3-to-3 collision integral for identical fermions is derived, and model calculations find it reduces nuclear matter relaxation times by up to a factor 3 versus two-body collisions alone.