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The Hubble constant from eight time-delay galaxy lenses

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arxiv 2007.14398 v2 pith:DJ6BTHEB submitted 2020-07-28 astro-ph.CO

classification astro-ph.CO
keywords hubblelensingmathrmconstantcosmologyfindmeasurementsprecision
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abstract

We present a determination of the Hubble constant from the joint, free-form analysis of 8 strongly, quadruply lensing systems. In the concordance cosmology, we find $H_0 = 71.8^{+3.9}_{-3.3}\,\mathrm{km}\,\mathrm{s}^{-1}\,\mathrm{Mpc}^{-1}$ with a precision of $4.97\%$. This is in agreement with the latest measurements from Supernovae Type Ia and Planck observations of the cosmic microwave background. Our precision is lower compared to these and other recent time-delay cosmography determinations, because our modelling strategies reflect the systematic uncertainties of lensing degeneracies. We furthermore are able to find reasonable lensed image reconstructions by constraining to either value of $H_0$ from local and early Universe measurements. This leads us to conclude that current lensing constraints on $H_0$ are not strong enough to break the "Hubble tension" problem of cosmology.

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  1. Exploring Hubble Tension Alleviation through Neutrino-Coupled Perturbed $f(R)$ Gravity

    gr-qc 2025-02 reject novelty 2.0 of 10

    A fit of Hu-Sawicki f(R) gravity with a fitted neutrino interaction to CMB, lensing, BAO, CC, and Pantheon data returns H0 near 70 km/s/Mpc, partially easing but not resolving the Hubble and S8 tensions.

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