Hybrid star properties from an extended linear sigma model

TL;DR

This paper investigates the properties of hybrid stars using an extended linear sigma model to derive the equation of state, analyzing their mass-radius relation to ensure consistency with astrophysical observations.

Contribution

It introduces the use of an (axial-)vector meson extended linear sigma model for modeling hybrid star matter and explores how model parameters affect star properties.

Findings

Mass-radius relations consistent with observations for certain parameters

Quark matter significantly influences star structure

Model parameters impact the maximum mass of hybrid stars

Abstract

The equation of state provided by effective models of strongly interacting matter should comply with the restrictions imposed by current astrophysical observations on compact stars. Using the equation of state given by the (axial-)vector meson extended linear sigma model, we determine the mass-radius relation and study whether these restrictions are satisfied under the assumption that most of the star is filled with quark matter. We study the dependence of the mass-radius relation on the parameters of the model.