Mass formulas and thermodynamic treatment in the mass-density-dependent model of strange quark matter

TL;DR

This paper introduces a self-consistent thermodynamic approach for the mass-density-dependent model of strange quark matter, resolving previous issues with vacuum limits and analyzing stability and sound velocity behavior.

Contribution

It presents a new method for quark mass parametrization and a thermodynamic treatment that includes the MIT bag model as a special case, improving the modeling of strange quark matter.

Findings

Strange quark matter can still be absolutely stable under the new treatment.

The lower density behavior of the sound velocity is opposite to previous results.

The model resolves unreasonable vacuum limits in earlier treatments.

Abstract

The previous treatments for strange quark matter in the quark mass-density-dependent model have unreasonable vacuum limits. We provide a method to obtain the quark mass parametrizations and give a self-consistent thermodynamic treatment which includes the MIT bag model as an extreme. In this treatment, strange quark matter in bulk still has the possibility of absolute stability. However, the lower density behavior of the sound velocity is opposite to previous findings.