Bochum 2018 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 19: Nuclear Astrophysics II
HK 19.2: Vortrag
Dienstag, 27. Februar 2018, 14:30–14:45, HZO 100
Classification of Twin Star Solutions — •Jan-Erik Christian, Andreas Zacchi, and Jürgen Schaffner-Bielich — Goethe Universtität Frankfurt
With the recent measurement of the gravitational wave GW170817 by LIGO the investigation into the inner workings of neutron stars becomes increasingly active. In that light we explore the possible mass radius relation of compact stars for the equation of states with a first order phase transition. Low density matter is described by a nuclear matter equation of state resulting from fits to nuclear properties. A constant speed of sound parametrization is used to describe the high density matter phase with the speed of sound cs2=1. A classification scheme of four distinct categories including twin star solutions, i. e. solutions with the same mass but differing radii, is found which are compatible with the M ≥ 2M⊙ pulsar mass constraint. We show the dependence of the mass and radius differences on the transition parameters and delineate that higher twin star masses are more likely to be accompanied by large radius differences. These massive twin stars are generated by high values of the discontinuity in the energy density and the lowest possible values of the transition pressure that still result in masses of M ≥ 2M⊙ at the maximum of the hadronic branch.