Simulations of inspiraling and merging double neutron stars using the Spectral Einstein Code

Simulations of inspiraling and merging double neutron stars using the Spectral Einstein Code
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使用光谱爱因斯坦代码模拟双中子星的吸入和合并

DOI:
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发表时间:
2016
期刊:
影响因子:
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通讯作者:
S. Teukolsky
S. Teukolsky
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作者:
R. Haas;C. Ott;B. Szilágyi;J. Kaplan;J. Lippuner;M. Scheel;K. Barkett;Curran D. Muhlberger;T. Dietrich;Matthew D. Duez;F. Foucart;H. Pfeiffer;Lawrence E. Kidder;S. Teukolsky

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给出了中子星-中子星(NSNS)系统的激发演化、合并演化和合并后演化的结果。我们的结果是使用伪谱-有限体积谱爱因斯坦程序(SPEC)得到的。为了检验我们的数值方法,我们为合并前的≈22轨道演化了一个等质量系统。这个波形是迄今为止从完全广义相对论模拟得到的最长的NSNSS波形。为了进一步改进引力波数据分析中使用的半解析模型,例如有效的一体式模型,需要这样长(且准确)的数值波形。我们详细讨论了SPEC对NSNS合并模拟能力的改进,特别是网格细化,以更好地解决合并和合并后阶段。我们提供了一组一致性检查,并将我们的结果与使用独立BAM代码的NSNS合并模拟进行了比较。我们发现它们之间是一致的,这增加了人们对使用这两种代码获得的结果的信心。这项工作为未来的研究铺平了道路,使用SPEC中子星物质的长波形和更复杂的微观物理描述。
We present results on the inspiral, merger, and postmerger evolution of a neutron star-neutron star (NSNS) system. Our results are obtained using the hybrid pseudospectral-finite volume Spectral Einstein Code (SpEC). To test our numerical methods, we evolve an equal-mass system for ≈22 orbits before merger. This waveform is the longest waveform obtained from fully general-relativistic simulations for NSNSs to date. Such long (and accurate) numerical waveforms are required to further improve semianalytical models used in gravitational wave data analysis, for example, the effective one body models. We discuss in detail the improvements to SpEC’s ability to simulate NSNS mergers, in particular mesh refined grids to better resolve the merger and postmerger phases. We provide a set of consistency checks and compare our results to NSNS merger simulations with the independent bam code. We find agreement between them, which increases confidence in results obtained with either code. This work paves the way for future studies using long waveforms and more complex microphysical descriptions of neutron star matter in SpEC.
具有通用自旋、偏心率、质量比和致密性的双中子星:准平衡序列和首次演化
DOI: 10.1103/physrevd.92.124007
发表时间: 2015
期刊: Physical Review D
影响因子: 5
作者:
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期刊: Physical Review D
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发表时间: 2015-06-20
影响因子: 4.9
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通讯作者: Pannarale, Francesco