数值相对论与引力波天文学

发布时间：2018-10-10 06:11

【摘要】：引力波直接探测已经被LIGO成功实现.在这个重大实验发现中,理论模型的重要作用得到充分体现.有效单体数值相对论模型不仅提升了既定硬件的灵敏度,把实验结果的置信度从4.6σ加强到5.1σ,而且还辨认出该引力波源是并合双黑洞.以这次实验结果所给出的双星并合事件率推断,地面引力波探测器接下来还会给出更多的引力波事件.这些引力波实验数据可以被用来进行天文学和基本物理学的研究.随着数据的积累和新脉冲星的加入,脉冲星计时计划的引力波探测精度也越来越高.空间引力波探测计划包括eLISA、太极和天琴等也在积极准备中.可以预期,引力波天文学将逐渐形成.在引力波天文学中,从信号读取到参数反演都离不开理论模型.不做任何解析近似的数值相对论是现实引力波源建模的通用工具.爱因斯坦方程的复杂数学结构和所需的庞大程序构架是数值相对论的两大困难.结合引力波天文学,本文对数值相对论的关键困难、发展历程、研究现状和在引力天文学中的应用等给出比较系统的描述.
[Abstract]:Direct detection of gravitational waves has been successfully implemented by LIGO. In this important experimental discovery, the important role of the theoretical model has been fully reflected. The effective monolithic numerical relativistic model not only improves the sensitivity of the given hardware and increases the confidence of the experimental results from 4.6 蟽 to 5.1 蟽, but also identifies the gravitational wave source as a combined double black hole. Based on the results of this experiment, we infer that the ground gravitational wave detector will give more gravitational wave events. These gravitational wave experimental data can be used to study astronomy and basic physics. With the accumulation of data and the addition of new pulsars, the precision of gravitational wave detection in pulsar timing plan is getting higher and higher. Space gravitational wave detection programs, including eLISA, Taiji and Tianqin, are also in active preparation. Gravitational wave astronomy is expected to evolve. In gravitational wave astronomy, the theoretical model is indispensable from signal reading to parameter inversion. Numerical relativity without any analytic approximation is a general tool for modeling real gravitational wave sources. The complex mathematical structure of Einstein's equation and the huge program framework required are two major difficulties in numerical relativity. Combined with gravitational wave astronomy, this paper gives a systematic description of the key difficulties, development history, research status and application in gravitational astronomy of numerical relativity.
【作者单位】：中国科学院数学与系统科学研究院;清华大学计算机科学与技术系;
【基金】：国家自然科学基金资助项目(编号:11375260)
【分类号】：O412.1

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