Neutron Star Properties in the Chiral Quark-Meson Coupling Model
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We study the properties of neutron star using the chiral quark-meson coupling model, in which the quark-quark hyperfine interaction due to the exchanges of gluon and pion based on chiral symmetry is considered. We also examine the effects of hyperons and $\Delta$-isobars in a neutron star. Extending the SU(6) spin-flavor symmetry to more general SU(3) flavor symmetry in the vector-meson couplings to baryons, the maximum mass of neutron star can reach the recently observed, massive pulsar mass, $1.97 \pm 0.04 M_{\odot}$. In this calculation, $\Lambda$ and $\Xi$ are generated in a neutron star, while $\Sigma$ and $\Delta$-isobars do not appear.
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