Open AccessNeutron Star Properties in a Chiral SU(3) Model
Author(s) -
Matthias Hanauske,
D. Zschiesche,
S. K. Pal,
S. Schramm,
H. Stöcker,
Walter Greiner
Publication year - 2000
Publication title -
the astrophysical journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.376
H-Index - 489
eISSN - 1538-4357
pISSN - 0004-637X
DOI - 10.1086/309052
Subject(s) - neutron star , physics , strangeness , equation of state , hyperon , neutron , saturation (graph theory) , star (game theory) , chiral model , type (biology) , stars , nuclear physics , particle physics , astrophysics , baryon , quantum mechanics , mathematics , ecology , combinatorics , biology
We investigate various properties of neutron star matter within an effectivechiral $SU(3)_L \times SU(3)_R$ model. The predictions of this model arecompared with a Walecka-type model. It is demonstrated that the importance ofhyperon degrees are strongly depending on the interaction used, even if theequation of state near saturation density is nearly the same in both models.While the Walecka-type model predicts a strange star core with strangenessfraction $f_S \approx 4/3$, the chiral model allows only for $f_S \approx 1/3$and predicts that $\Sigma^0$, $\Sigma^+$ and $\Xi^0$ will not exist in star, incontrast to the Walecka-type model.Comment: 13 pages, Revtex, 5 figs include
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