A model-independent determination of the Hubble constant from lensed quasars and supernovae using Gaussian process regression

Abstract

Strongly lensed quasar systems with time delay measurements provide "time delay distances", which are a combination of three angular diameter distances and serve as powerful tools to determine the Hubble constant $H_0$. However, current results often rely on the assumption of the $\Lambda$CDM model. Here we use a model-independent method based on Gaussian process to directly constrain the value of $H_0$. By using Gaussian process regression, we can generate posterior samples of unanchored supernova distances independent of any cosmological model and anchor them with strong lens systems. The combination of a supernova sample with large statistics but no sensitivity to $H_0$ with a strong lens sample with small statistics but $H_0$ sensitivity gives a precise $H_0$ measurement without the assumption of any cosmological model. We use four well-analyzed lensing systems from the state-of-art lensing program H0LiCOW and the Pantheon supernova compilation in our analysis. Assuming the Universe is flat, we derive the constraint $H_0=72.2\pm 2.1$km/s/Mpc, a precision of $2.9\%$. Allowing for cosmic curvature with a prior of ${\Omega }_k=[-0.2,0.2]$, the constraint becomes $H_0=73.0_{-3.0}^{+2.8}$km/s/Mpc.

7 pages, 5 figures. Accepted for publication in ApJ Letters

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