New code for equilibriums and quasiequilibrium initial data of compact objects. II. Convergence tests and comparisons of binary black hole initial data
New code for equilibriums and quasiequilibrium initial data of compact objects. II. Convergence tests and comparisons of binary black hole initial data
复制标题
DOI：
10.1103/physrevd.86.104001
复制
发表时间：
2012-10
影响因子：
5
通讯作者：
K. Uryū;A. Tsokaros;P. Grandclément
中科院分区：
文献类型：
--
作者：
K. Uryū;A. Tsokaros;P. Grandclément
COCAAL是一种基于有限差分方法计算单个或二元致密物体的平衡或准平衡初始数据的代码。我们给出了利用时间对称的二元黑洞数据(Brill-Lindquist解)对Cocal码进行补充收敛测试的结果。然后，我们比较了从Cocal和Kadath得到的共形平坦空间切片上双星黑洞的初始数据，其中Kadath是一个用谱方法解决包括相对论致密天体在内的广泛理论物理问题的库。从两个代码计算的数据彼此很好地收敛，对于封闭和基本分开的双星黑洞的圆形轨道。最后，作为一个例子，计算了具有自旋共转的等质量二元黑洞初始数据序列，并与文献中的数据进行了比较。
Cocal is a code for computing equilibriums or quasiequilibrium initial data of single or binary compact objects based on finite difference methods. We present the results of supplementary convergence tests of cocal code using time symmetric binary black hole data (Brill-Lindquist solution). Then, we compare the initial data of binary black holes on the conformally flat spatial slice obtained from cocal and KADATH, where KADATH is a library for solving a wide class of problems in theoretical physics including relativistic compact objects with spectral methods. Data calculated from the two codes converge nicely towards each other, for close as well as largely separated circular orbits of binary black holes. Finally, as an example, a sequence of equal mass binary black hole initial data with corotating spins is calculated and compared with data in the literature.