Mainz 2012 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

HK: Fachverband Physik der Hadronen und Kerne

HK 62: Nukleare Astrophysik

HK 62.5: Vortrag

Freitag, 23. März 2012, 15:30–15:45, RW 2

Quark Stars in the Quark-Meson-Model — •Margit Maly, Rainer Stiele, and Jürgen Schaffner-Bielich — Institute for Theoretical Physics, Heidelberg University, Philosophenweg 16, Heidelberg, D-69120

Compact stellar objects are nature’s laboratory for probing QCD in the high density, low temperature regime. For exploring the properties of compact stars made of pure quark matter, we use an effective model for the quark interaction respecting the chiral symmetry of the original QCD-Lagrangian. This linear sigma model including quark degrees of freedom is complemented by an repulsive interaction coming in through vector meson exchange. By varying the free parameters of the model one can set up several different equations of state which result in various mass-radius-relations for quark stars.

By using the recent new mass limit for compact stars from pulsar PSR J1614-2230 of M=(1.97 ± 0.04)M_⊙, we constrain the possible parameter space of our model and discuss implications for the possible existence of selfbound quark stars.