paper

A Hubble Constant Determination Through Quasar Time Delays and Type Ia Supernovae

arXiv:2503.06189 · doi:10.3390/universe11030089

Abstract

This paper presents a new model-independent constraint on the Hubble constant () by anchoring relative distances from Type Ia supernovae (SNe Ia) observations to absolute distance measurements from time-delay strong Gravitational Lensing (SGL) systems. The approach only uses the validity of the cosmic distance duality relation (CDDR) to derive constraints on . By using Gaussian Process (GP) regression to reconstruct the unanchored luminosity distance from the Pantheon compilation to match the time-delay angular diameter distance at the redshift of the lenses, one yields a value of km/s/Mpc at a 68\% confidence level. The result aligns well with the local estimate from Cepheid variables within the confidence region, indicating consistency with late-universe probes.

11 pages, 3 figures

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