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arXiv 1702.00872gr-qcastro-ph.CO
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数值相对论的后牛顿拟圆初轨道

Post-Newtonian Quasicircular Initial Orbits for Numerical Relativity

James Healy, Carlos O. Lousto, Hiroyuki Nakano, Yosef Zlochower

摘要:

我们使用后牛顿(PN)近似来确定初始轨道和自旋参数的黑洞二进制,导致低偏心率的吸气时,与数值相对论技术的发展。特别是,我们寻求初始配置,导致非常小的偏心率在小的分离,预期天体物理系统。我们考虑三种情况:(i)没有径向速度的准圆轨道,(ii)具有由辐射反应确定的初始径向速度的准圆轨道,(iii)从大得多的分离的PN运动方程的演化中获得的参数。我们研究了七个自旋的,非旋进的,质量不等的双星。然后,我们使用几个定义的偏心率,基于轨道分离和波形相位和振幅,并发现,使用完整的3PN哈密顿准圆轨道,以获得切向轨道动量,并使用已知的最高阶辐射反应表达式,以获得径向动量,导致最低的偏心率。该方法的精度甚至超过了基于3PN和4PN演进的螺旋数据。

英文摘要:

We use post-Newtonian (PN) approximations to determine the initial orbital and spin parameters of black hole binaries that lead to low-eccentricity inspirals when evolved with numerical relativity techniques. In particular, we seek initial configurations that lead to very small eccentricities at small separations, as is expected for astrophysical systems. We consider three cases: (i) quasicircular orbits with no radial velocity, (ii) quasicircular orbits with an initial radial velocity determined by radiation reaction, and (iii) parameters obtained form evolution of the PN equations of motion from much larger separations. We study seven cases of spinning, nonprecessing, unequal mass binaries. We then use several definitions of the eccentricity, based on orbital separations and waveform phase and amplitude, and find that using the complete 3PN Hamiltonian for quasicircular orbits to obtain the tangential orbital momentum, and using the highest-known-order radiation reaction expressions to obtain the radial momentum, leads to the lowest eccentricity. The accuracy of this method even exceeds that of inspiral data based on 3PN and 4PN evolutions.

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