天琴对宇宙膨胀的探测能力研究  

Research on Tianqin′s capability of probing the cosmic expansion

作　　者：李霄栋 肖小圆 王凌风 赵泽伟 张鑫 LI Xiaodong;XIAO Xiaoyuan;WANG Lingfeng;ZHAO Zewei;ZHANG Xin(School of Physics and Astronomy,Sun Yat-sen University(Zhuhai Campus),Zhuhai 519082,China;College of Science,Northeastern University,Shenyang 110004,China)

机构地区：[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

出　　处：《中山大学学报（自然科学版）》2021年第1期62-73,共12页Acta Scientiarum Naturalium Universitatis Sunyatseni

基　　金：国家自然科学基金(11803094);广州市基础与应用基础研究项目(202002030360)。

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popⅢ、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。After decades of development,the research of cosmology has entered the epoch of precision cosmology.According to the Planck observational results and theΛCDM 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 basicΛCDM model.The answers to these questions require extension of the basicΛCDM 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 popⅢ,Q3 nod and Q3 d 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 Q3 nod model has the strongest ability.The standard siren detection of Tianqin is helpful to break the degeneracy of cosmolo

关 键 词：宇宙学 宇宙大尺度结构 宇宙学参数 

分 类 号：P159.5[天文地球—天文学]