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HK: Fachverband Physik der Hadronen und Kerne
HK 14: Theorie
HK 14.1: Gruppenbericht
Montag, 10. März 2008, 16:30–17:00, 2F
Relativistic Density Functional Theory for Dynamical Properties of Nuclear Matter — •Urnaa Badarch, Andreas Fedoseew, and Horst Lenske — Institut für Theoretische Physik, Universität Gießen
The relativistic density dependent hadron field theory (DDRH) is a density functional theory with microscopically derived meson exchange interactions. The DDRH approach allows a fully self-consistent calculation of the equation of state and the symmetry energy at any proton-to-neutron fraction on a fully microscopic level. Also we investigate the compressibility and other thermodynamical quantities of nuclear matter over a large density range. The special role of the δ-(a0(980)) meson for the effective masses is discussed. A comparison of the DDRH results to those from phenomenological approaches shows significant deviations at very low and high densities relevant for neutron star calculations. The effects on neutron star matter in beta-equilibrium are discussed. Results for the mass-radius relation, i.e. the equation of state of neutron stars are presented. Extensions including hyperons have been tested in investigations of rotating neutron stars. The dynamical properties of nuclear matter are studied in a systematic way by deriving the field theoretical Fermi-Liquid interactions from the DDRH Lagrangian. The Landau-Migdal parameters, obtained as the ground state expectation values of the field theoretical amplitudes, are found to depend in asymmetric matter on the charge ratio of the system. Response functions have been calculated for various modes of excitation.