Correlations in Many-Body Systems with Two-time Green's Functions

Details Correlations in Many-Body Systems with Two-time Green's Functions Correlations in Many-Body Systems with Two-time Green's Functions

2001-02-27

arxiv.org/abs/nucl-th/0102059v2

Phys.Rev. C64 (2001) 024613

Physics

Nuclear Physics

Nuclear Theory

Scientific paper

10.1103/PhysRevC.64.024613

The Kadanoff-Baym (KB) equations are solved numerically for infinite nuclear matter. In particular we calculate correlation energies and correlation times. Approximating the Green's functions in the KB collision kernel by the free Green's functions the Levinson equation is obtained. This approximation is valid for weak interactions and/or low densities. It relates to the extended quasi-classical approximation for the spectral function. Comparing the Levinson, Born and KB calculations allows for an estimate of higher order spectral corrections to the correlations. A decrease in binding energy is reported due to spectral correlations and off-shell parts in the reduced density matrix.

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