中子星-中子星和中子星-黑洞双星准平衡位形的后牛顿诊断
A post-Newtonian diagnosis of quasiequilibrium configurations of neutron star-neutron star and neutron star-black hole binaries
摘要：
我们使用后牛顿诊断工具来检验数值生成的非自旋双中子星和中子星-黑洞双星系统的准平衡初始数据集。PN方程包括潮汐相互作用的影响，由中子星的紧凑性和适当的“拱点”常数值来参数化，拱点常数测量恒星受到潮汐力的扭曲程度。我们发现，后牛顿诊断同意与双中子星的初始数据，通常超过百分之零点五，除非潮汐扭曲变得极端。我们表明，差异可以解释为代表小的剩余偏心率在初始轨道。在将诊断结果与中子星-黑洞双星的初步数值数据进行比较时，我们发现不太一致。
英文摘要：
We use a post-Newtonian diagnostic tool to examine numerically generated quasiequilibrium initial data sets for non-spinning double neutron star and neutron star-black hole binary systems. The PN equations include the effects of tidal interactions, parametrized by the compactness of the neutron stars and by suitable values of ``apsidal'' constants, which measure the degree of distortion of stars subjected to tidal forces. We find that the post-Newtonian diagnostic agrees well with the double neutron star initial data, typically to better than half a percent except where tidal distortions are becoming extreme. We show that the differences could be interpreted as representing small residual eccentricity in the initial orbits. In comparing the diagnostic with preliminary numerical data on neutron star-black hole binaries, we find less agreement.
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