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Widths of low-lying states in nuclei are of the order of 30 MeV. These largewidths are a consequence of the strong interactions leading to a stronglycorrelated many body system at the typical densities of nuclear matter.Nevertheless "traditional" Brueckner calculations treat these states asquasiparticles i.e. with spectral functions of zero widths. The width isrelated to the imaginary part of the selfenergy and is includedselfconsistently in an extension of the Brueckner theory using T-matrix andGreen's function techniques. A more general formulation applicable also tonon-equilibrium systems is contained in the Kadanoff-Baym (KB) equations whilestill maintaining the basic many-body techniques of Bruecknet theory. In thepresent work the two-time KB-equations are time-stepped along the imaginarytime-axis to calculate the binding energy of nuclear matter as a function ofdensity, including the spectral widths self-consistently. These zerotemperature calculations are compared with quasi-particle calculations. Theinclusion of the self-consistent widths are found to add several MeV to thebinding. The spectral widths are due to the long-ranged correlations.Short-ranged correlations decrease rather than increase the binding. The metodis easily extended to non-zero temperatures where the importance of the widthsare expected to increase.Comment: 5 pages 4 figures Submitted to Proceedings: Progress in  Nonequilibrium Green's Functions III 22-26 August, University Kiel, German

Beyond the quasi-particle picture in nuclear matter calculations using Green's function techniques