高红移类星体数据对相互作用暗能量的观测限制  

Constraint on the interacting dark energy from the highly redshifted quasar data

作　　者：兰明建[1] 潘吉成 潘宇 何源 邹江宁 王平 LAN MingJian;PAN JiCheng;PAN Yu;HE Yuan;ZOU JiangNing;WANG Ping(College of Computer Science and Information Engineering,Chongqing Technology and Business University,Chongqing 400067,China;College of Science,Chongqing University of Posts and Telecommunications,Chongqing 400065,China;School of Communication and Information Engineering of Science,Chongqing University of Posts and Telecommunication,Chongqing 400065,China)

机构地区：[1]重庆工商大学计算机科学与信息工程学院,重庆400067 [2]重庆邮电大学理学院,重庆400065 [3]重庆邮电大学通信学院,重庆400065

出　　处：《中国科学：物理学、力学、天文学》2020年第7期86-97,共12页Scientia Sinica Physica,Mechanica & Astronomica

基　　金：重庆市基础研究与前沿探索项目(编号:cstc2018jcyjAX0192);重庆市自然科学基金面上项目(编号:cstc2019jcyj-msxmX0081);重庆邮电大学校级项目(编号:A2017-66,A2019-66,A2019-267,W2016-30);重庆市教委科学技术研究项目(编号:KJ1600409);国家自然科学基金(编号:61601074)资助。

摘　　要：基于对120颗中等光度射电类星体(QSO)中致密结构的VLBI观测结果(0.46<z<2.76),结合Ia型超新星(SNIa)数据、2018年微波背景辐射(CMB)数据及重子声学振荡(BAO)数据,我们对一种相互作用模型(ξIDE)进行了精确观测检验,并期望对"巧合性"问题进行定量分析.我们用不同红移段的QSO子样本(120颗QSO、70颗低红移QSO、50颗高红移QSO)与SNIa的联合限制模型参数,结果显示如下.(1)由三种组合给出的(ξ,ω)参数值可知宇宙学巧合性问题仍然没有被缓解,ΛCDM仍然是与该观测符合最好的模型.(2)相较于单独使用SNIa数据作为宇宙学标准烛光,高红移的标准直尺QSO数据加入到SNIa里(SNIa+QSO)可以将相互作用暗能量模型参数限制得更紧密,从而进一步证实了中等亮度类星体作为标准直尺应用到宇宙学研究中的潜力.(3)SNIa与SNIa+QSO(低红移)之间不存在冲突问题.(4)在CMB+BAO+SNIa中引入射电类星体数据(CMB+BAO+SNIa+QSO),我们得到的哈勃常数最佳拟合值与SNIa+QSO及CMB+BAO+SNIa给出的结果在2σ误差范围内保持一致,并且进一步缓解了超新星与Planck2018给出的H0存在的冲突问题.In this study,we investigated observational constraints on the phenomenological interacting dark energy model(ξIDE)and seek the quantitative analysis of the coincidence problem on the basis of the VLBI observations of the compact structure in 120 intermediate-luminosity quasars(QSO)covering the redshift range of 0.46<z<2.76,combined with the type Ia supernovae(SNIa),the baryonic acoustic oscillation(BAO),and the cosmic microwave background(CMB)observation from 2018 results.The combined analysis with the full sample and sub-samples of QSO and SNIa defined by different redshifts(120 QSO,70 low-redshift QSO,50 high-redshift QSO)show that:(1)As can be seen from the constraint on the two parameters(ξ,ω)from three data combinations,the coincidence problem is not alleviated,and the standardΛCDM model without any interaction remains a good fit for the recent observational data;(2)compared with the current SNIa standard candle data,the combination of the intermediate-luminosity radio quasars(SNIa+QSO)provides more stringent constraints on this IDE scenario,which further indicates the potential of intermediate-luminosity quasars acting as an effective cosmological standard ruler at much higher redshifts;(3)there is no clear tension between SNIa and SNIa+QSO(low z);(4)when combined with CMB and BAO observations,the derived Hubble constant from CMB+BAO+SNIa+QSO agrees well with that from SNIa+QSO and CMB+BAO+SNIa(within 2σ).Furthermore,the full combination of different cosmological probes(CMB+BAO+SNIa+QSO)may contribute to alleviate the tension of H0 between the recent Planck and SNIa measurements.

关 键 词：相互作用暗能量 IA型超新星 高红移类星体数据 巧合性问题 

分 类 号：P145.9[天文地球—天体物理]