Quarks stars in SU(2) Nambu-Jona-Lasinio model with vector coupling

TL;DR

This paper investigates how the SU(2) Nambu-Jona-Lasinio model with vector coupling affects quark star properties, revealing that stronger vector interactions lead to more massive and larger stars.

Contribution

It introduces the application of the SU(2) Nambu-Jona-Lasinio model with vector coupling to quark stars and analyzes the impact on their structure.

Findings

Stronger vector coupling results in more massive quark stars.

Increased vector interaction leads to larger stellar radii.

The equation of state is significantly influenced by the vector coupling.

Abstract

In this work we study the Nambu-Jona-Lasinio model in the SU (2) version with repulsive vector coupling and apply it to quark stellar matter. We discuss the influence of the vector interaction on the equation of state (EoS) and study quark stars that are composed of pure quark matter with two flavors. We show that, increasing the vector coupling, we obtain more massive stars with larger radii for the same central energy density.