Neutron Star Properties in the Chiral Quark-Meson Coupling Model

Abstract

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, $1.97\pm 0.04M_{\odot }$. In this calculation, $\Lambda$ and $\Xi$ are generated in a neutron star, while $\Sigma$ and $\Delta$-isobars do not appear.

Comments: 4 pages, 3 figures, 1 table, Presented at the 20th International IUPAP Conference on Few-Body Problems in Physics, 20 - 25 August, 2012, Fukuoka, Japan