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HK: Fachverband Hadronen und Kerne
HK 83: Nuclear Structure and Dynamics II
HK 83.1: Gruppenbericht
Freitag, 20. März 2009, 11:00–11:30, H-ZO 50
Density Dependent Hadron Field Theory and its Applications — Urnaa Badarch, •Andreas Fedoseew, Walter Heupel, Horst Lenske, and Anika Obermann — Institut für Theoretische Physik, Universität Giessen, Germany
In-medium NN interactions are derived in an ab initio approach by Dirac-Brueckner theory.
Within the density dependent relativistic hadron (DDRH) field theory we obtain a
fully covariant and thermodynamically consistent density functional theory with interaction vertices described as Lorentz-scalar functionals of the field operators. Nuclear matter results from our ab initio description are compared to calculations with phenomenological input. Employing this model, the properties of isospin asymmetric nuclear matter and neutron stars are studied. The symmetry energy is found to be affected significantly by the δ/a0(980) scalar-isovector channel. Landau-Migdal parameters are derived. They enter into quasi-free response functions. Dirac-RPA results for different spin-isospin channels reproduce available data on longitudinal and transverse response functions quite well. As an interesting case we examine the properties of neutron stars, serving also as a test for the high-density behavior of the theory. Neutron star matter in beta-equilibrium including the appearance of hyperons in the core of compact stars is investigated. Results for the mass-to-radius relation show an interesting dependence on the strength of density dependence of the symmetry energy.
This work is supported by the European Graduate School “Complex
Systems of Hadrons and Nuclei”.