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

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arxiv 2505.01661 v1 pith:Y4KTREA3 submitted 2025-05-03 astro-ph.CO

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

classification astro-ph.CO
keywords distancecosmographyhubblesupernovaetime-delaycombinationconstantcosmological
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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 Pad\'{e} 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$D_{\Delta t}$) 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 $H_0 = 72.9^{+1.8}_{-1.8}$ ${\mathrm{~km~s^{-1}~Mpc^{-1}}}$ for the Taylor series cosmography and $r_d = 137.0_{-3.7}^{+3.2}$ Mpc and $H_0 = 73.1_{-1.7}^{+1.8}$ ${\mathrm{~km~s^{-1}~Mpc^{-1}}}$ for the Pad\'{e} 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-$\Lambda$CDM model. However, the values of $H_0$ are consistent with the $H_0$ determination from SH0ES collaboration.

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  1. Late-time cosmological constraints on three holographic dark energy models with DESI DR2 BAO and Type Ia supernovae

    physics.gen-ph 2026-07 accept novelty 4.0

    DESI DR2 and late-time data constrain HDE, ADE and RDE, yielding H0≈67–68 km/s/Mpc, c≈1, n≈2.8, γ≈0.54, with none resolving the Hubble tension or decisively beating ΛCDM.