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

## TL;DR

This paper develops an equation of state for neutron stars using the quark-meson coupling model with the cloudy bag, incorporating hyperons, gluon exchange, and pion-cloud effects to better understand neutron star properties.

## Contribution

It introduces a novel equation of state for neutron stars that includes hyperons and quark substructure effects within the quark-meson coupling framework.

## Key findings

- Hyperon inclusion affects neutron star mass-radius relations.
- Quark degrees of freedom influence the maximum mass of neutron stars.
- Baryon substructure variations are crucial for supporting massive neutron stars.

## 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.