Structure of magnetized strange quark star in perturbative QCD

TL;DR

This paper calculates the equation of state for magnetized strange quark matter using perturbative QCD and predicts the properties of magnetized strange quark stars, including their maximum mass and stability against black hole formation.

Contribution

It introduces a detailed perturbative QCD approach to modeling magnetized strange quark stars, comparing regular and background perturbation theories.

Findings

Maximum mass exceeds three solar masses.

Threshold magnetic field for anisotropic effects is between 2×10^18 G and 3×10^18 G.

The star's properties prevent it from being a black hole.

Abstract

We have performed the leading order perturbative calculation to obtain the equation of state (EoS) of the strange quark matter (SQM) at zero temperature under the magnetic field B = 10^18 G. The SQM comprises two massless quark flavors (up and down) and one massive quark flavor(strange). Consequently, we have used the obtained EoS to calculate the maximum gravitational mass and the corresponding radius of the magnetized strange quark star (SQS). We have employed two approaches, including the regular perturbation theory (RPT) and the background perturbation theory (BPT). In RPT the infrared (IR) freezing effect of the coupling constant has not been accounted for, while this effect has been included in BPT. We have obtained the value of the maximum gravitational mass to be more than three times the solar mass. The validity of isotropic structure calculations for SQS has also been investigated. Our results show that the threshold magnetic field from which an anisotropic approach begins to be significant lies in the interval 2*10^18G < B < 3*10^18G. Furthermore, we have computed the redshift, compactness and Buchdahl-Bondi bound of the SQS to show that this compact object cannot be a black hole.