Is the remnant of GW190425 a strange quark star?

TL;DR

This paper explores whether the remnant of GW190425 could be a strange quark star by modeling the effects of different QCD theories on SQS structure and comparing maximum masses with GW190425's remnant mass.

Contribution

It introduces new equations of state for strange quark matter based on analytic and background perturbation theories and applies them to interpret GW190425's remnant.

Findings

Maximum gravitational masses of SQS are comparable to GW190425 remnant mass.

The study suggests GW190425's remnant could be a strange quark star.

QCD model effects significantly influence SQS mass predictions.

Abstract

This study investigates the effects of different QCD models on the structure of strange quark stars (SQS). In these models, the running coupling constant has a finite value in the infrared region of energy. By imposing some constraints on the strange quark matter (SQM) and exploiting the analytic and background perturbation theories, the equations of states for the SQM are obtained. Then, the properties of SQSs in general relativity are evaluated. By using component masses of GW190425 \cite{Abbott2020ApJL} as well as some conversion relations between the baryonic mass and the gravitational mass, the remnant mass of GW190425 is obtained. Our results for the maximum gravitational mass of SQS are then compared with the remnant mass of GW190425. The results indicate that the obtained maximum gravitational masses are comparable to the remnant mass of GW190425. Therefore, it is proposed that the remnant mass of GW190425 might be a SQS.