Quark Models and Radial Oscillations: Decoding the HESS J1731-347 Compact Object's Equation of State

TL;DR

This paper explores the internal structure and oscillation frequencies of strange stars using quark models, aiming to understand the nature of the compact object in HESS J1731-347 and its equation of state.

Contribution

It compares different quark models and their radial oscillation predictions to better understand the equation of state of the HESS J1731-347 compact object.

Findings

Radial oscillation frequencies vary across models.

The models provide insights into the mass-radius relationship.

Comparison constrains the equation of state for strange stars.

Abstract

We investigate the peculiar nature of strange stars through an analysis of different quark models, i.e. vBag model and CFL model equation of states at different parameter sets, and focus on understanding the equation of state governing the intriguing central compact object (CCO) within the supernova remnant HESS J1731-347, with a mass and radius of $M = 0.77^{+0.20}_{-0.17} M_{\odot}$ and $R = 10.4^{+0.86}_{-0.78}$ km, respectively. Additionally, we compare the radial oscillations of two models to determine the frequency of the HESS J1731-347 compact object at its maximum mass. The frequencies of radial oscillations are computed for each of the four EoSs considered. In total, the 10 lowest radial frequencies for each of those EoSs have been computed. By delving into these aspects, we aim at deepening our understanding of strange stars and their connection to the observed HESS J1731-347 mass-radius relationship.