A Joint Analysis of Strong Lensing and Type Ia Supernovae to Determine the Hubble Constant

2025/05/22 by Colaço, L. R., Holanda, R. F. L., Santana, Z. C. +1 · 1 citation
#Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences

paper · doi:10.48550/arxiv.2505.17262

Abstract

We present a cosmological model-independent determination of the Hubble constant, H₀, by combining time-delay measurements from seven TDCOSMO systems, Einstein radius measurements, and Type Ia Supernovae data sourced from the Pantheon+ sample. For each lens of time-delay system, we calculate the angular diameter distance D_Al using the product D^\textrmObs(z_l) ⋅ D_A,Δt^\textrmObs(z_l, z_s), where D^\textrmObs(z_l) is reconstructed via Gaussian Processes from 99 Einstein radius measurements, and D_A,Δt^\textrmObs(z_l,z_s) is the time-delay angular distance. We also reconstruct the unanchored luminosity distance H₀ D_L(z_l) from supernova data. By using the cosmic distance duality relation validity, we anchor D_Al and H₀ D_L(z_l) to infer H₀ = 70.55 ± 7.44 km/s/Mpc (68% CL). Our result, though not resolving the Hubble tension, offers a cosmological model-independent consistency check and highlights the potential of using strong lensing and supernovae data via the cosmic distance duality relation to constrain H₀.

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Cited by

• Revisiting Cosmic Distance Duality with Megamasers and DESI DR2: Model Independent Constraints on Early-Late Calibration

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