The Hubble constant H₀ 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^+0.78_−1.03, 69.81^+2.22_−2.70 and 66.75^+3.42_−4.23 km s⁻¹ Mpc⁻¹ at 68% confidence level in the ACDM, wCDM and w₀w_aCDM 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.

中文翻译：

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从低z数据集中测量H 0

哈勃常数H ₀代表目前宇宙的膨胀率，并且与宇宙的年龄密切相关。哈勃常数的准确测量对于现代宇宙学至关重要。然而，不同的宇宙学观察在文学中给出了哈勃常数的不同值。到目前为止，有两种测量哈勃常数的方法。一种是根据造父变星的距离阶梯估计值直接测量哈勃常数。另一种是在宇宙学模型（例如“标准” ACDM模型）的假设下全局拟合哈勃常数。采用低红移观测数据集，包括Ia型超新星的万神殿样本，重子声振荡测量和断层摄影Alcock-Paczynski方法，我们确定哈勃常数为67.95 ^+0.78_-1.03，69.81 ^2.22 _-2.70和66.75 ^3.42 _-4.23公里S ^-1 Mpc的^-1在ACDM，WCDM 68％置信水平和瓦特₀瓦特_一个分别CDM模型，。与Riess等人给出的哈勃常数相比。在2019年，我们得出结论，如果所有这些数据集都是可靠的，则需要超越标准ACDM模型的新物理学。