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
Δ
-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±0.04
M
⊙
. In this calculation,
Λ
and
Ξ
are generated in a neutron star, while
Σ
and
Δ
-isobars do not appear.