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Quasiequilibrium states of black hole-neutron star binaries in the moving-puncture framework

机译:中国黑洞 - 中子星双星的准平衡态   移动穿刺框架

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摘要

General relativistic quasiequilibrium states of black hole-neutron starbinaries are computed in the moving-puncture framework. We propose threeconditions for determining the quasiequilibrium states and compare thenumerical results with those obtained in the excision framework. We find thatthe results obtained in the moving-puncture framework agree with those in theexcision framework and with those in the third post-Newtonian approximation forthe cases that (i) the mass ratio of the binary is close to unity irrespectiveof the orbital separation, and (ii) the orbital separation is large enough($m_0\Omega \alt 0.02$ where $m_0$ and $\Omega$ are the total mass and theorbital angular velocity, respectively) irrespective of the mass ratio. For$m_0 \Omega \agt 0.03$, both of the results in the moving-puncture and excisionframeworks deviate, more or less, from those in the third post-Newtonianapproximation. Thus the numerical results do not provide a quasicircular state,rather they seem to have a nonnegligible eccentricity of order 0.01--0.1. Weshow by numerical simulation that a method in the moving-puncture framework canprovide approximately quasicircular states in which the eccentricity is by afactor of $\sim 2$ smaller than those in quasiequilibrium given by otherapproaches.
机译:黑洞中子恒星的相对论准平衡态是在移动穿刺框架中计算的。我们提出了确定准平衡态的三个条件,并将数值结果与切除框架中获得的数值进行比较。对于以下情况,我们发现在运动穿刺框架中获得的结果与切除框架和第三后牛顿近似中的结果一致:(i)二元质量比接近于1且与轨道间距无关,并且( ii)轨道间隔足够大($ m_0 \ Omega \ alt 0.02 $,其中$ m_0 $和$ \ Omega $分别是总质量和轨道角速度),而与质量比无关。对于$ m_0 \ Omega \ agt 0.03 $,移动穿刺和切除框架的结果都或多或少地偏离第三次牛顿近似法的结果。因此,数值结果没有提供准圆形状态,而是具有0.01--0.1阶的不可忽略的偏心率。我们通过数值模拟表明,在移动穿刺框架中的一种方法可以提供近似准圆形的状态,在该状态下,偏心距比其他方法给出的拟均衡中的偏心距要小2个模元。

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