Revisiting the Hubble constant, sound horizon and cosmography from late-time Universe observations

Zhiwei Yang; Tonghua Liu; Xiaolei Li

doi:10.3847/1538-4357/adb7e5

paper

Revisiting the Hubble constant, sound horizon and cosmography from late-time Universe observations

arXiv:2505.01661 · doi:10.3847/1538-4357/adb7e5

Abstract

The Hubble tension has become one of the central problems in cosmology. In this work, we determine the Hubble constant $H_{0}$ and sound horizon $r_{d}$ by using the combination of Baryon Acoustic Oscillations (BAOs) from DESI surveys, time-delay lensed quasars from H0LiCOW collaborations and the Pantheon supernovae observations. We consider two cosmological approaches, i.e., Taylor series and Padé polynomials, to avoid cosmological dependence. The reason for using this combination of data is that the absolute distance provided by strong gravitational lensing helps anchor the relative distance of BAO, and supernovae provide a robust history of universe evolution. {{Combining the 6 time-delay distance (6 $D_{Δ t}$ ) plus 4 angular diameter distance to the deflector (4 $D_{d}$ ) measurements of time-delay lensed quasars,}} the BAO and the type Ia of supernovae (SNe Ia) datasets, we obtain a model-independent result of $r_{d} = 138. 2_{- 3.9}^{+ 3.3}$ Mpc and $H_{0} = 72. 9_{- 1.8}^{+ 1.8}$ $km s^{- 1} Mp c^{- 1}$ for the Taylor series cosmography and $r_{d} = 137. 0_{- 3.7}^{+ 3.2}$ Mpc and $H_{0} = 73. 1_{- 1.7}^{+ 1.8}$ $km s^{- 1} Mp c^{- 1}$ for the Padé polynomials cosmography. The determination of $r_{d}$ and $H_{0}$ prefers larger $H_{0}$ and smaller $r_{d}$ than Planck data under the assumption of flat- $Λ$ CDM model. However, the values of $H_{0}$ are consistent with the $H_{0}$ determination from SH0ES collaboration.

10 pages, 3 figures

Revisiting the Hubble constant, sound horizon and cosmography from late-time Universe observations

Abstract

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