Uniformly rotating, axisymmetric, and triaxial quark stars in general relativity
Uniformly rotating, axisymmetric, and triaxial quark stars in general relativity
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广义相对论中的均匀旋转、轴对称和三轴夸克星
DOI：
10.1103/physrevd.97.023013
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发表时间：
2018
影响因子：
5
通讯作者：
Uryu Koji
中科院分区：
文献类型：
--
作者：
Zhou Enping;Tsokaros Antonios;Rezzolla Luciano;Xu Renxin;Uryu Koji
在广义相对论引力场下，计算了均匀旋转轴对称和三轴夸克星的准平衡模型。采用Isenberg-Wilson-马修斯（IWM）公式，并将紧凑对象计算器（cocal）代码扩展到处理具有有限表面密度和新状态方程（EOSs）的旋转恒星。除了MIT的夸克物质袋模型，这是由解除限制的夸克，我们研究了一个新的状态方程提出的赖和徐是基于夸克集群和结果在刚性状态方程，可以支持质量高达3.3 M的情况下，我们考虑。我们进行收敛性测试，我们的新代码，以评估有限的表面密度在我们的解决方案的准确性和构造序列的解决方案，小和高紧凑性的影响。由于粘性耗散的长期不稳定性的发病进行了鉴定和可能的影响进行了讨论。基于四极公式给出了引力波振幅和光度的估计，并与中子星进行了比较。
Quasiequilibrium models of uniformly rotating axisymmetric and triaxial quark stars are computed in a general-relativistic gravity scenario. The Isenberg-Wilson-Mathews (IWM) formulation is employed and the Compact Object Calculator (cocal) code is extended to treat rotating stars with finite surface density and new equations of state (EOSs). Besides the MIT bag model for quark matter which is composed of deconfined quarks, we examine a new EOS proposed by Lai and Xu that is based on quark clustering and results in a stiff EOS that can support masses up to 3.3 M☉ in the case we considered. We perform convergence tests for our new code to evaluate the effect of finite surface density in the accuracy of our solutions and construct sequences of solutions for both small and high compactness. The onset of secular instability due to viscous dissipation is identified and possible implications are discussed. An estimate of the gravitational wave amplitude and luminosity based on quadrupole formulas is presented and comparison with neutron stars is discussed.