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Neutron star properties in a chiral SU(3) model

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arxiv astro-ph/9909052 v1 pith:JFLMC25X submitted 1999-09-02 astro-ph nucl-th

Neutron star properties in a chiral SU(3) model

classification astro-ph nucl-th
keywords modelstarchiralwalecka-typeapproxneutronpredictsproperties
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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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  1. Core Composition Effects on the QCD Axion Mass Limit from Neutron Star Cooling

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    Varying neutron star core composition with hyperons and Delta resonances mildly affects the QCD axion mass limit from cooling, potentially bringing the DFSZ limit into the IAXO sensitivity window.