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Research on Tianqin's capability of probing the cosmic expansion
- Acta Scientiarum Naturalium Universitatis Sunyatseni Vol. 60, Issue 1, Pages: 62-73(2021)
- 作者机构：
1.中山大学物理与天文学院，广东 珠海 519082
2.东北大学理学院，辽宁 沈阳 110004
- 作者简介：
- 基金信息：
DOI：10.13471/j.cnki.acta.snus.2020.11.18.2020B143
CLC： P159.5Published：25 January 2021，
Published Online：08 January 2021，
Received：18 November 2020，
Accepted：19 November 2020
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李霄栋,肖小圆,王凌风等.天琴对宇宙膨胀的探测能力研究[J].中山大学学报(自然科学版),2021,60(01):62-73.
LI Xiaodong,XIAO Xiaoyuan,WANG Lingfeng,et al.Research on Tianqin's capability of probing the cosmic expansion[J].Acta Scientiarum Naturalium Universitatis Sunyatseni,2021,60(01):62-73.
李霄栋,肖小圆,王凌风等.天琴对宇宙膨胀的探测能力研究[J].中山大学学报(自然科学版),2021,60(01):62-73. DOI： 10.13471/j.cnki.acta.snus.2020.11.18.2020B143.
LI Xiaodong,XIAO Xiaoyuan,WANG Lingfeng,et al.Research on Tianqin's capability of probing the cosmic expansion[J].Acta Scientiarum Naturalium Universitatis Sunyatseni,2021,60(01):62-73. DOI： 10.13471/j.cnki.acta.snus.2020.11.18.2020B143.
摘要
经过近几十年的发展，宇宙学的研究已经进入精确宇宙学时代。根据Planck测量结果和ΛCDM模型，只需要6个参数就可以在统计意义上重现出与观测数据基本符合的宇宙演化历史。但是实际上，当前宇宙学领域中还存在许多未解决的重要科学问题，而且不同的观测数据在基于基本ΛCDM模型进行宇宙学参数推断时会出现一些不一致性。这些问题的回答都需要对基本ΛCDM模型进行扩展，并对额外引入的参数进行精确的测量。目前主流的宇宙学探针主要是针对宇宙的膨胀历史和宇宙的结构增长进行观测的光学（以及近红外）项目，因此它们可能存在着相似的系统误差。发展全新的非光学观测手段的宇宙学探针对于宇宙学未来的研究至关重要。因为引力波振幅携带了绝对光度距离的信息，所以能够帮助建立真正的距离——红移关系，用以研究宇宙的膨胀历史。这种引力波观测被称为“标准汽笛”。宇宙学研究是天琴、LISA等空间引力波探测器的重要研究目标之一。这些探测器预计都可以在未来观测到大量的引力波事件，为宇宙学研究（特别是高红移宇宙）提供珍贵的观测数据。本文参考相关的文献，介绍了天琴标准汽笛数据限制宇宙学参数能力的情况。考虑了pop Ⅲ、Q3nod和Q3d三种大质量黑洞双星模型，结果表明，对于不同的大质量黑洞双星模型，天琴项目对宇宙学参数的限制能力各有不同，其中Q3nod 模型下的限制能力最强。天琴的标准汽笛探测有助于打破其他观测手段所导致的宇宙学参数简并，从而有效地提升宇宙学参数的测量精度。我们有理由相信，未来的引力波观测与光学和射电观测相结合将把宇宙膨胀历史的探索推进至一个全新的层面，为探测哈勃常数大小、揭示暗能量的本质属性提供帮助。
Abstract
After decades of development， the research of cosmology has entered the epoch of precision cosmology. According to the Planck observational results and the ΛCDM model， we need only 6 parameters to reproduce the evolution history of the universe which is consistent with the observed data in a statistical sense. However， in fact， there are still many unsolved important scientific problems in the field of cosmology， and there will be some inconsistencies in different observational data when inferring cosmological parameters based on the basic ΛCDM model. The answers to these questions require extension of the basic ΛCDM model and accurately measurements of the additional parameters. At present， the mainstream cosmological probes are mainly optical （and near-infrared） observations of the expansion history and structural growth of the universe， so they may have similar systematic errors. It is very important for the future research of cosmology to develop new non-optical observational probes. Because the amplitude of gravitational wave carries the information of absolute luminosity distance， it can help us to establish the real distance-redshift relation and study the expansion history of the universe. This observation of gravitational waves is known “standard siren”. Cosmological research is one of the important research objectives of the Tianqin space gravitational wave detector， which is expected to be able to observe a large number of gravitational wave events in the future， providing valuable observational data for the study of cosmology （especially at high redshift）. In this paper， we introduce previous researches about the ability of Tianqin standard siren data to constrain the cosmological parameters. We consider pop Ⅲ， Q3nod and Q3d models. The results show that for different binary models of massive black holes， the Tianqin project yields to different constraining results on the cosmological parameters， and the Q3nod model has the strongest ability. The standard siren detection of Tianqin is helpful to break the degeneracy of cosmological parameters caused by other observation methods， so as to effectively improve the measurement accuracy of cosmological parameters. We have reason to believe that the future gravitational wave observations combined with optical and radio observations will promote the exploration of the history of cosmic expansion to a new level， and provide help to detect the size of Hubble constant and reveal the nature of dark energy.
关键词
宇宙学宇宙大尺度结构宇宙学参数
Keywords
cosmologylarge-scale structure of universecosmological parameters
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