用一种新的编码重新研究运动穿孔黑洞
A Reinvestigation of Moving Punctured Black Holes with a New Code
摘要：
我们报告我们的代码，其中应用移动穿刺方法和自适应/固定网格细化实施，并在其初步性能上的黑洞模拟。基于BSSN公式，最新的规范条件和修改的公式也实施和测试。在这项工作中，我们提出了我们的主要结果的模拟一个单一的静态黑洞，一个移动的单一黑洞，和正面碰撞的一个二元黑洞系统。对于静态穿孔黑洞的模拟，不同的修改的BSSN制定。它表明，目前使用的两套修改导致一个稳定的演变。对于运动的被刺穿的黑洞，我们寻找可行的规范条件，研究自旋对黑洞演化的影响。我们的研究结果证实了其他研究小组先前的研究结果。此外，我们还发现了一个新的规范条件，这个条件还没有被任何其他研究者采用，它也可以给出稳定而精确的黑洞演化计算。我们检查的性能的代码的正面碰撞的一个二元黑洞系统，和协议的引力波形，它产生与其他作品中获得的。为了定性地理解物质对双黑洞碰撞的影响，我们也研究了相同的迎头碰撞场景，但受标量场的扰动。用该程序进行的数值模拟不仅给出了与其他数值相对论小组一致的稳定而精确的结果，而且发现了一个新的可行规范条件，澄清了BSSN公式修正中的一些模糊之处.
英文摘要：
We report on our code, in which the moving puncture method is applied and an adaptive/fixed mesh refinement is implemented, and on its preliminary performance on black hole simulations. Based on the BSSN formulation, up-to-date gauge conditions and the modifications of the formulation are also implemented and tested. In this work we present our primary results about the simulation of a single static black hole, of a moving single black hole, and of the head-on collision of a binary black hole system. For the static punctured black hole simulations, different modifications of the BSSN formulation are applied. It is demonstrated that both the currently used sets of modifications lead to a stable evolution. For cases of a moving punctured black hole with or without spin, we search for viable gauge conditions and study the effect of spin on the black hole evolution. Our results confirm previous results obtained by other research groups. In addition, we find a new gauge condition, which has not yet been adopted by any other researchers, which can also give stable and accurate black hole evolution calculations. We examine the performance of the code for the head-on collision of a binary black hole system, and the agreement of the gravitational waveform it produces with that obtained in other works. In order to understand qualitatively the influence of matter on the binary black hole collisions, we also investigate the same head-on collision scenarios but perturbed by a scalar field. The numerical simulations performed with this code not only give stable and accurate results that are consistent with the works by other numerical relativity groups, but also lead to the discovery of a new viable gauge condition, as well as clarify some ambiguities in the modification of the BSSN formulation.
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