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Zhang, Xue; Huang, Qing-Guo
Measuring H-0 from low-z datasets
AbstractThe Hubble constant H-0 represents the expansion rate of the Universe at present and is closely related to the age of the Universe. The accurate measurement of Hubble constant is crucial for modern cosmology. However, different cosmological observations give diverse values of Hubble constant in literature. Up to now, there are two methods to measure the Hubble constant. One is to directly measure the Hubble constant based on distance ladder estimates of Cepheids and so on. The other is to globally fit the Hubble constant under the assumption of a cosmological model, for example the "standard" ACDM model. Adopting the low-redshift observational datasets, including the Pantheon sample of Type Ia supernovae, baryon acoustic oscillation measurements, and the tomographic Alcock-Paczynski method, we determine the Hubble constant to be 67.95-1.03+0.78, 69.81-2.70+2.22 and 66.75-4.23+3.42 km s(-1) Mpc(-1) at 68% confidence level in the ACDM, wCDM and w(0)w(a)CDM models, respectively. Compared to the Hubble constant given by Riess et al. in 2019, we conclude that the new physics beyond the standard ACDM model is needed if all of these datasets are reliable.
Cooperation Status国内
Subject AreaPhysics
MOST Discipline CataloguePhysics, Multidisciplinary
Indexed BySCIE
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Cited Times:5[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.[Zhang, Xue
2.Chinese Acad Sci, Inst Theoret Phys, CAS Key Lab Theoret Phys, Beijing 100190, Peoples R China
3.Univ Chinese Acad Sci, Sch Phys Sci, Beijing 100049, Peoples R China
4.Yangzhou Univ, Coll Phys Sci & Technol, Ctr Gravitat & Cosmol, Yangzhou 225009, Jiangsu, Peoples R China
5.Hunan Normal Univ, Synerget Innovat Ctr Quantum Effects & Applicat, Changsha 410081, Peoples R China
Recommended Citation
GB/T 7714
Zhang, Xue,Huang, Qing-Guo. Measuring H-0 from low-z datasets[J]. SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY,2020,63(9):290402.
APA Zhang, Xue,&Huang, Qing-Guo.(2020).Measuring H-0 from low-z datasets.SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY,63(9),290402.
MLA Zhang, Xue,et al."Measuring H-0 from low-z datasets".SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY 63.9(2020):290402.
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