Münster 2011 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 25: Nukleare Astrophysik II
HK 25.2: Vortrag
Dienstag, 22. März 2011, 17:00–17:15, HS3
Quark matter in massive neutron stars — •Simon Weissenborn1, Irina Sagert2, Giuseppe Pagliara1, Matthias Hempel3, and Jürgen Schaffner-Bielich1 — 1Institute for Theoretical Physics, Ruprecht-Karls University, Philosophenweg 16, Heidelberg, D-69120 — 2Frankfurt Institute for Advanced Studies, Goethe University, Ruth-Moufang Str. 1, Frankfurt, D-60438 — 3Department of Physics, University of Basel, Klingelbergstrasse 82, Basel, CH-4056
The recent observation of the pulsar PSR J1614-2230 with a mass of 1.97 solar masses gives a strong constraint on the nuclear matter equation of state. We explore the parameter ranges for a parameterized equation of state for quark stars. We find that such massive objects made of absolutely stable strange quark matter can reach the new constraint only if effects from the strong coupling constant and color superconductivity are considered. Also hybrid stars are able to be massive but a pure quark matter core appears only if the hadronic equation of state is stiff. A soft hadronic equation of state would imply that hybrid stars contain just a core of quark hadron mixed phase. In general, due to the softening of the equation of state at the quark-hadron phase transition the masses of hybrid stars stay below the ones of hadronic and pure quark stars.