Compact stars within an asy-soft quark-meson-coupling model

TL;DR

This paper explores how a soft symmetry energy in the quark meson coupling model affects the properties of compact stars, including hyperon content, mass, and radius, with implications for astrophysical observations.

Contribution

It introduces a detailed analysis of compact star properties within a soft symmetry energy QMC model, considering hyperon-meson coupling uncertainties and their effects.

Findings

Softer symmetry energy results in stars with fewer hyperons.

Stars with softer symmetry energy have smaller radii and larger masses.

Hyperon-meson couplings significantly influence stellar mass predictions.

Abstract

We investigate compact star properties within the quark meson coupling model (QMC) with a soft symmetry energy density dependence at large densities. In particular, the hyperon content and the mass/radius curves for the families of stars obtained within the model are discussed. The hyperon-meson couplings are chosen according to experimental values of the hyperon nuclear matter potentials, and possible uncertainties are considered. It is shown that a softer symmetry energy gives rise to stars with less hyperons, smaller radii and larger masses. Hyperon-meson couplings may also have a strong effect on the mass of the star.