一种求解动力学正则化和后牛顿力的混合N体程序
A Hybrid N-Body Code Incorporating Algorithmic Regularization and Post-Newtonian Forces
摘要：
我们描述了一种新的N体代码设计的模拟星系的中心区域包含大质量的黑洞。该代码采用了Mikkola的“算法”链正则化方案，包括后牛顿条款高达PN2.5阶。恒星移动链以外的先进使用四阶积分器与计算的GRAPE板上的力量。性能测试证实，混合代码实现了更好的节能，在更少的时间内，比标准的计划，它再现了恒星的轨道紧密结合的黑洞与高精度。混合代码被应用到两个样本问题：有限N引力波动的影响的S-恒星的轨道;和螺旋的一个中等质量的黑洞到银河系中心。
英文摘要：
We describe a novel N-body code designed for simulations of the central regions of galaxies containing massive black holes. The code incorporates Mikkola's 'algorithmic' chain regularization scheme including post-Newtonian terms up to PN2.5 order. Stars moving beyond the chain are advanced using a fourth-order integrator with forces computed on a GRAPE board. Performance tests confirm that the hybrid code achieves better energy conservation, in less elapsed time, than the standard scheme and that it reproduces the orbits of stars tightly bound to the black hole with high precision. The hybrid code is applied to two sample problems: the effect of finite-N gravitational fluctuations on the orbits of the S-stars; and inspiral of an intermediate-mass black hole into the galactic center.
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