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arXiv 0908.0620gr-qc
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构造双星中子星初始数据的一种新的数值方法

A new numerical method to construct binary neutron star initial data

Wolfgang Tichy

摘要:

我们提出了一种新的数值方法产生的双中子星的初始数据,使用的方法沿着威尔逊-马修斯或密切相关的共形薄三明治方法的路线。我们的方法使用六个不同的计算域,其中包括空间无穷大。每个域都有其自己的坐标,这些坐标被选择为使得星形表面总是与域边界重合。这些性质便于边界条件的施加。由于我们所有的领域是光滑的每个区域内,我们能够使用一个有效的伪谱方法来解决椭圆方程的共形薄三明治的方法。目前,我们已经实现了任意质量比的共转配置,但扩展到任意自旋是可能的。本文的主要目的是介绍我们的新方法,并测试我们的代码几种不同的配置。

英文摘要:

We present a new numerical method for the generation of binary neutron star initial data using a method along the lines of the the Wilson-Mathews or the closely related conformal thin sandwich approach. Our method uses six different computational domains, which include spatial infinity. Each domain has its own coordinates which are chosen such that the star surfaces always coincide with domain boundaries. These properties facilitate the imposition of boundary conditions. Since all our fields are smooth inside each domain, we are able to use an efficient pseudospectral method to solve the elliptic equations associated with the conformal thin sandwich approach. Currently we have implemented corotating configurations with arbitrary mass ratios, but an extension to arbitrary spins is possible. The main purpose of this paper is to introduce our new method and to test our code for several different configurations.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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