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HK: Fachverband Physik der Hadronen und Kerne

HK 25: Nukleare Astrophysik II

HK 25.9: Talk

Tuesday, March 22, 2011, 18:45–19:00, HS3

Neutron stars with small radii - the role of Delta resonances — •Torsten Schürhoff — Institut für Theoretische Physik, Goethe Universität Frankfurt/Main, 60438 Frankfurt/Main, FIAS

Recent neutron star observations suggest that the masses and radii of neutron stars may be smaller than previously considered, which would disfavor a purely nucleonic equation of state (EoS). In our model, we use a flavor SU(3) sigma model that includes Δ resonances and hyperons in the EoS. We find that if the coupling of the Δ resonances to the vector mesons is slightly smaller than that of the nucleons, we can reproduce both the measured mass-radius relationship and the extrapolated EoS.