# Compact star properties from an extended linear sigma model

## TL;DR

This paper investigates the properties of compact stars using an extended linear sigma model to derive the equation of state, analyzing mass-radius relations and compatibility with astrophysical observations, especially focusing on quark matter composition.

## Contribution

It introduces an extended linear sigma model for the equation of state of dense matter and assesses its implications for compact star properties and observational constraints.

## Key findings

- The model produces mass-radius relations consistent with current astrophysical observations.
- Quark matter presence significantly influences the star's mass and radius.
- Comparison shows the extended model aligns well with simpler models while providing additional insights.

## Abstract

The equation of state provided by effective models of strongly interacting matter should comply with the restrictions imposed by current astrophysical observations of 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 also compare the mass-radius sequence with those given by the equations of state of somewhat simpler models.