Tübingen 2003 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 5: Theorie I

HK 5.3: Group Report

Monday, March 17, 2003, 16:45–17:15, D

A Self-Consistent Many-Body Approach — •Tobias Frick, Armen Sedrakian, and Herbert Müther — Institut für theoretische Physik der Universität Tübingen, Auf der Morgenstelle 14, 72076 Tübingen

Within a Green’s functions approach, the neutron and the proton properties are studied in both symmetric and asymmetric nuclear matter at low temperature, using realistic NN potentials.

As a starting point, we use spectral functions that are calculated from the off-shell nuclear self-energy in a quasi-particle picture with self-consistent Brueckner-Hartree-Fock energy spectra as input. We then go beyond the quasi-particle picture and account for the depletion of the hole state in the many-body system by constructing the real and the imaginary part of the two-particle propagator that appears in the ladder-equation for the effective interaction from these single-particle spectral functions. A self-consistent spectral function requires an iterative procedure that includes the solution of the Galitskii-Feynman equation, the calculation of the nuclear self-energy and the solution of the Dyson equation in each iteration cycle.

Results of the Green’s functions approach are compared to the corresponding predictions of the quasi-particle approach and the conventional Brueckner-Hartree-Fock results.