Equation of State for Neutron Stars in the Quark-Meson Coupling Model with the Cloudy Bag

Abstract

Using the quark-meson coupling model with the cloudy bag, we construct the equation of state for neutron stars with hyperons in SU(3) flavor symmetry. The hyperfine interaction due to the gluon exchange and the pion-cloud effect inside a baryon is taken into account in vacuum and nuclear matter. We investigate how the quark degrees of freedom and the exchanges of gluon and pion between two quarks affect the properties of nuclear and neutron-star matter. It is found that the variation of baryon substructure in matter plays an important role in supporting massive neutron stars.

Comments: 4 papes, 3 figures, 2 tables, accepted to the proceedings of the 8th International Conference on Quarks and Nuclear Physics (QNP2018) in JPS Conference Proceedings