New code for equilibriums and quasiequilibrium initial data of compact objects. III. Axisymmetric and triaxial rotating stars
New code for equilibriums and quasiequilibrium initial data of compact objects. III. Axisymmetric and triaxial rotating stars
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DOI：
10.1103/physrevd.93.044056
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发表时间：
2016-02
影响因子：
5
通讯作者：
K. Uryū;A. Tsokaros;F. Galeazzi;Hideya Hotta;Misa Sugimura;K. Taniguchi;S. Yoshida
中科院分区：
文献类型：
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作者：
K. Uryū;A. Tsokaros;F. Galeazzi;Hideya Hotta;Misa Sugimura;K. Taniguchi;S. Yoshida
我们介绍了一种新的程序，用于计算单转动相对论恒星的定常平衡和轴对称平衡，以及三轴准平衡的初始数据。新代码是作为我们用于紧凑对象的通用初始数据代码的一部分开发的，紧凑对象计算器(Cocal)。在计算强引力场时，在先前发展的伊森伯格-威尔逊-马修斯公式(共形平面薄层夹层公式)的基础上，将无波长公式并入局部程序中。还介绍了一种新的差动旋转定律，它包含两个参数来控制角速度分布和从均匀旋转到差异旋转的过渡。我们给出了定常轴对称致密星的均匀和微分旋转平衡以及均匀旋转的三轴(非轴对称)致密星的准平衡初值的收敛检验和解序列。我们还给出了用三种不同的程序：Cocal，Lorene和RNScode计算的一致旋转轴对称解的比较。
We introduce new code for stationary and axisymmetric equilibriums, as well as for triaxial quasiequilibrium initial data, of single rotating relativistic stars. The new code is developed as a part of our versatile initial data code for compact objects, Compact Object CALculator (cocal). In computing strong gravitational fields, the waveless formulation is incorporated into thecocalcode on top of the previously developed Isenberg-Wilson-Mathews formulation (conformally flat thin-sandwich formulation). Also introduced is a new differential rotation law that contains two parameters to control an angular velocity profile and a transition from uniform to differential rotation. We present convergence tests and solution sequences for both uniformly and differentially rotating equilibriums of stationary axisymmetric compact stars, as well as for quasiequilibrium initial data of uniformly rotating triaxial (nonaxisymmetric) compact stars. We also show comparisons of uniformly rotating axisymmetric solutions computed with three different codes:cocal,lorene, and theRNScode.