# Structure of hot strange quark stars: an NJL model approach at finite temperature

## TL;DR

This study explores the thermodynamic properties and structural characteristics of hot strange quark stars using the NJL model at finite temperatures, revealing that increasing temperature leads to stiffer equations of state and larger star masses and radii.

## Contribution

It introduces a finite-temperature NJL model approach to analyze the structure and stability of hot strange quark stars, highlighting temperature effects on their properties.

## Key findings

- Equation of state becomes stiffer with temperature increase.
- Maximum mass and radius of SQS increase with temperature.
- Average density exceeds nuclear density and rises with temperature.

## Abstract

In this paper, we investigated the thermodynamic properties of strange quark matter using Nambu-Jona-Lasinio (NJL) model at finite temperatures where we considered the dynamical mass as the effective interaction between quarks. By considering the pressure of strange quark matter (SQM) at finite temperatures, we showed that the equation of state of this system gets stiffer by increasing temperature. In addition, we investigated the energy conditions and stability of the equation of state and showed that the equation of state of SQM satisfy the conditions of stability. Finally, we computed the structure properties of hot strange quark stars (SQS) including the gravitational mass, radius, Schwarzschild radius, average density, compactness and gravitational redshift. Our calculations showed that in this model, the maximum mass and radius of SQS increase by increasing temperature. Furthermore it was shown that the average density of SQS is greater than the normal nuclear density, and it is an increasing function of temperature. We also discussed the temperature dependence of the maximum gravitational mass calculated from different methods.