Münster 2017 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
HK: Fachverband Physik der Hadronen und Kerne
HK 23: Nuclear Astrophysics II
HK 23.2: Vortrag
Dienstag, 28. März 2017, 14:30–14:45, F 33
Constraining the nuclear equation of state through the moment of inertia of neutron stars — •Svenja Kim Greif1,2, Kai Hebeler1,2, and Achim Schwenk1,2,3 — 1Institut für Kernphysik, Technische Universität Darmstadt — 2ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung GmbH — 3Max-Planck-Institut für Kernphysik, Heidelberg
The recent discovery of 2 M⊙ neutron stars yields systematic constraints on the nuclear equation of state. Neutron star masses can be measured very precisely, their radii are, however, inherently difficult to measure due to the influence from large systematic uncertainties. A prospective moment of inertia measurement using pulsar timing observations will provide a promising alternative. We present a theoretical framework for calculating neutron star masses, radii, and moments of inertia microscopically. We use state–of–the–art equations of state up to nuclear densities based on chiral effective field theory interactions. For high densities, we expand the equations of state and take the requirements of causality and of reproducing 2 M⊙ neutron stars into account. Our approach allows us to generate a large set of equations of state that predicts different possible combinations of masses, radii, and moments of inertia. Based on our results, we investigate how a moment of inertia measurement constrains the radius and thus the equation of state.
*This work is supported by the ERC Grant No. 307986 STRONGINT and the Deutsche Forschungsgemeinschaft through Grant SFB 1245.