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HK: Fachverband Physik der Hadronen und Kerne

HK 17: Kern- und Teilchen-Astrophysik

HK 17.5: Gruppenbericht

Dienstag, 11. März 2008, 09:30–10:00, 2B

Hyperons in Neutron Stars — •Haris Djapo¹, Bernd-Jochen Schaefer², and Jochen Wambach^1,3 — ¹Institut für Kernphysik, TU Darmstadt, Schloßgartenstr. 9, D-64289 Darmstadt, Germany — ²Institut für Physik, Karl-Franzens-Universität Graz,Universitätsplatz 5, A-8010 Graz, Austria — ³Gesellschaft für Schwerionenforschung mbH, Planckstr. 1, D-64291 Darmstadt, Germany

Hyperons in dense matter are investigated by employing a recently constructed hyperon nucleon (YN) potential together with a parameterization of the pure nucleon equation of state. The YN potential is a so called low-momentum potential obtained with renormalization group methods. The densities at which hyperons appear in neutron star (NS) are calculated at zero temperature in Hartree-Fock approximation. By comparing several different bare YN potentials in the RG approach and by varying the parameters for nuclear matter over a wide range it turns out that the presence of hyperons in NS is very robust. This result has profound consequences for the mass and radius of NS.