Neutron star properties in a chiral SU(3) model

Details Neutron star properties in a chiral SU(3) model Neutron star properties in a chiral SU(3) model

1999-09-02

arxiv.org/abs/astro-ph/9909052v1

Astronomy and Astrophysics

Astrophysics

13 pages, Revtex, 5 figs included

Scientific paper

10.1086/309052

We investigate various properties of neutron star matter within an effective chiral $SU(3)_L \times SU(3)_R$ model. The predictions of this model are compared with a Walecka-type model. It is demonstrated that the importance of hyperon degrees are strongly depending on the interaction used, even if the equation of state near saturation density is nearly the same in both models. While the Walecka-type model predicts a strange star core with strangeness fraction $f_S \approx 4/3$, 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, in contrast to the Walecka-type model.

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