Unified interacting quark matter and its astrophysical implications

被引：23

作者：

Zhang, Chen ^{[1
,2
]}

Mann, Robert B. ^{[2
]}

机构：

[1] Univ Toronto, Dept Phys, 60 St George St, Toronto, ON M5S 1A7, Canada

[2] Univ Waterloo, Dept Phys & Astron, Waterloo, ON N2L 3G1, Canada

来源：

PHYSICAL REVIEW D | 2021年 / 103卷 / 06期

基金：

加拿大自然科学与工程研究理事会;

关键词：

STARS;

D O I：

10.1103/PhysRevD.103.063018

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We investigate interacting quark matter (IQM), including the perturbative QCD correction and color superconductivity, for both up-down quark matter and strange quark matter. We first derive an equation of state (EOS) unifying all cases by a simple reparametrization and rescaling, through which we manage to maximally reduce the number of degrees of freedom. We find, in contrast to the conventional EOS p = 1/3(rho - 4B(eff)) for noninteracting quark matter, that taking the extreme strongly interacting limit on the unified IQM EOS gives p = rho - 2B(eff), where B-eff is the effective bag constant. We employ the unified EOS to explore the properties of pure interacting quark stars (IQSs) composed of IQM. We describe how recent astrophysical observations, such as the pulsar-mass measurements, the NICER analysis, and the binary merger gravitational-wave events GW170817, GW190425, and GW190814, further constrain the parameter space. An upper bound for the maximum allowed mass of IQSs is found to be M-TOV less than or similar to 3.23 M-circle dot. Our analysis indicates a new possibility that the currently observed compact stars, including the recently reported GW190814's secondary component (M = 2.59(-0.09)(+0.08) M-circle dot), can be quark stars composed of interacting quark matter.

引用

页数：7

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