Quark-Meson Coupling model based upon the Nambu-Jona Lasinio model

TL;DR

This paper develops a quark-meson coupling model based on the NJL framework, incorporating proper time regularization to simulate confinement, and applies it to nuclear and neutron matter, including hyperon interactions.

Contribution

It introduces a novel NJL-based quark-meson coupling model with confinement features for nuclear matter studies, offering an alternative to the MIT bag model.

Findings

Model fits saturation properties of symmetric nuclear matter.

Explores equation of state for neutron matter at high densities.

Analyzes hyperon binding relevant to neutron star physics.

Abstract

The NJL model for the octet baryons, using proper time regularization to simulate some of the features of confinement, is solved self-consistently in nuclear matter. This provides an alternative framework to the MIT bag model which has been used in the quark-meson coupling model. After fitting the parameters of the model to the saturation properties of symmetric nuclear matter the model is used to explore the equation of state of pure neutron matter as well as nuclear matter at densities relevant to heavy ion collisions. With a view to future studies of high mass neutron stars, the binding of hyperons is also explored.