München 2019 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 28: Nuclear Astrophysics II
HK 28.2: Talk
Tuesday, March 19, 2019, 17:00–17:15, HS 16
Impact of the equation of state in core-collapse supernovae — •Sabrina Schäfer1,2, Hannah Yasin1, Almudena Arcones1,3, and Achim Schwenk1,2,4 — 1Institut für Kernphysik, Technische Universität Darmstadt — 2ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung GmbH — 3GSI Helmholtzzentrum für Schwerionenforschung GmbH — 4Max-Planck-Institut für Kernphysik, Heidelberg
Neutron stars originate in core-collapse supernovae, which are one of the most energetic events in the universe. In core-collapse supernova simulations, the equation of state is a key ingredient. However, matter at high densities is only poorly constrained and the nuclear equation of state is still not fully understood. Equations of state that are available for supernova simulations differ considerably in their underlying theory as well as nuclear physics input. We investigate the impact of different nuclear matter properties on the equation of state in core-collapse supernovae. To this end, we introduce a range of equations of state based on the Lattimer and Swesty equation of state that vary the nucleon effective mass, incompressibility, symmetry energy, and nuclear saturation point. Larger effective masses lead to lower pressures at nuclear densities and a lower thermal index. This has an important impact on the proto-neutron star contraction and shock evolution.
*This work was supported by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) - Projektnummer 279384907 - SFB 1245 and the European Research Council Grant No. 677912 EUROPIUM.