引力波源的理论研究
文献类型：学位论文
| 作者 | 刘进忠
|
| 学位类别 | 博士 |
| 答辩日期 | 2010-05-28 |
| 授予单位 | 中国科学院研究生院（云南天文台） |
| 授予地点 | 北京 |
| 导师 | 韩占文 |
| 关键词 | 引力波 银河系 统计研究 |
| 学位专业 | 天体物理 |
| 中文摘要 | 这是一篇关于引力波源理论研究的博士论文。引力波因其巨大的研究意义一直备受关注，使得引力波天文学成为现代天文学中一个非常热门的研究课题，它是观测天文学20世纪中叶以来逐渐兴起的一个新兴分支，其发展的基础是广义相对论的引力辐射理论在各类天体系统中的应用。 最近几十年，对引力波天文学的研究取得了很大的进步，各类地面（VIRGO,LIGO, TAMA300,GEO600）引力波探测得到了长足的发展，尤其是欧洲空间局的空间激光干涉探测引力波(LISA)的计划， 使得对于引力波探测的研究充满了希望。像其他探索宇宙奥妙的天文方法一样，此领域的研究将与之并驾齐驱。本文综述了关于引力波的理论及观测研究现状，并详细介绍了本人在攻读博士学位期间在 引力波源理论研究领域的工作。对于引力波的研究包括很多方面，其中对引力波源的研究是我们工作的重点，尤其是双星系统这样的引力波源又是我们工作的重中之重。对于双星源的研究是引力波天文学的重要理论课题之一，主要包括预言从特定的引力波源会发射出怎样的引力波，这是引力波探测器的设计依据，也为对观测结果进行数据分析提供了波形的模板。 利用大样本恒星演化的方法，我们分别对下列引力波源进行了研究：分离双白矮星系统、AMCVn系统、超致密X-射线双星系统（ultra-compact X-raybinaries）、双中子星系统、恒星级双黑洞系统及其黑洞-中子星系统。例如，对于分离双白矮星系统，我们利用Han98模型并结合LISA探测器灵敏曲线，发现这类系统主导银河系内的引力波背景辐射。我们模型预言，对于LISA探测器的高频波段，在一年内可以被探测到的这类分离的双白矮星系统大约有10000个。这些双白矮星系统主要是通过两次公共包层抛射产生，其组成为双氦白矮星系统（He+He）或碳氧白矮星+氦白矮星系统（CO+He）。对于分离的双白矮星模型，值得指出的是我们建立的模型与现在的观测结果符合的很好。同样，对于其他类型的引力波源我们也逐个进行分析研究，如：脉冲星的引力波，引力塌缩的引力波和大质量和超大质量黑洞的引力波，希望通过理论分析能对目前地面引力波探测器或将来的LISA计划提供支持。 |
| 英文摘要 | This paper is a theoretical doctorial thesis on the study of gravitational wave (GW) radiation sources. GW is a natural consequence of Einstein's theory of gravity (``general relativity"), and minute distortions of space--time. Gravitational Wave Astronomy is an emerging branch of observational astronomy which aims to use GWs to collect observational data about objects such as neutron stars and black holes, about events such as supernovae and about the early universe shortly after the big bang. The Laser Interferometer Gravitational-Wave Observatory or LIGO, a joint project between Massachusetts Institute of Technology (MIT) and California Institute of Technology (Caltech) is spearheading with equally ambitious projects such as VIRGO, TAMA 300 and GEO 600. Specially, the LISA is a planned space based GW observatory at low frequency with the launch date in the 2018+ time frame. This field will evolve to become an established component of 21st century multi-messenger astronomy, and will stand shoulder-to-shoulder with gamma-ray, x-ray, optical, infrared and radio astronomers in exploring the cosmos。In this thesis, we state recent theoretical study on GW sources, and present the results of our studies on the field. The different frequency ranges of the GW detectors will respectively correspond to different observation sources. The main purpose of this paper is to explore the different GW sources with respect to the ground or space detectors. Specially, we focus on the compact binaries as GW sources. These studies not only help us to understand the waveform of different sources, but also at some level can allow us to characterize the range of possible GW signals. By means of a population synthesis code, we investigate close double white dwarfs (CDWDs), AM CVn stars, ultra-compact X-ray binaries(UCXBs), double neutron stars, double stellar black holes as GW sources, respectively. For instance, we used population synthesis models to create a population of compact double white dwarfs (CDWDs) and discussed the the effect of these binaries as both foreground noise and resolvable sources for the LISA GW detector. We also look in more detail at the systems that form the resolvable sources. In particular, we show istributions of the primary and secondary masses, which indicate whether a binary member is a helium or carbon-oxygen white dwarf, as well as chirp masses and orbital periods for the CDWDs that are ervable with LISA, and we compare these distributions to a sample of observed systems. In addition, we discuss the birth rates for the three relevant formation channels and the contribution of each channel to the observable CDWDs. At the same time, we also analyze other GW sources, such as pulsar, gravitational collapse of core, double super--massive black holes. We hope that our studies can characterize the ground and space detectors in the future. |
| 学科主题 | 天文学 |
| 语种 | 中文 |
| 页码 | 119 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/4662]  |
| 专题 | 云南天文台_大样本恒星演化研究组 |
| 推荐引用方式 GB/T 7714 | 刘进忠. 引力波源的理论研究[D]. 北京. 中国科学院研究生院（云南天文台）. 2010. |
入库方式： OAI收割
来源：云南天文台
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