München 2019 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 51: Nuclear Astrophysics IV
HK 51.2: Vortrag
Donnerstag, 21. März 2019, 14:30–14:45, HS 18
Signals in the tidal deformability for phase transitions in compact stars with constraints from GW170817 — •Jan-Erik Christian, Andreas Zacchi, and Jürgen Schaffner-Bielich — Institut für Theoretische Physik, Goethe-Universität Frankfurt
Since the measurement of the merger event GW170817 tidal deformabilies are pivotal in constraining the equation of state for compact stars. We compute the tidal deformabilities for equations of state with a strong first order phase transition producing a new separate branch in the mass-radius diagram. A case is found where all three possible pairs of combinations between these two neutron star branches are present for the total mass of M = 2.7⊙ of the observed merger event GW170817. It is demonstrated that the plot of the two tidal deformabilities Λ1 and Λ2 of the binary neutron star can show up to three separate branches. We propose that the future detections of neutron star merger events with the same value for Λ1 but different values of Λ2 serve as a signal for the existence of a strong first order phase transition in neutron star matter.