1708.08454
Large-Distance Lens Uncertainties and Time-Delay Measurements of $H_0$
Muñoz, Kamionkowski
Consider the uncertainties in the mass distribution in the outskirts of the lens. Show that these can lead to errors in the inferred $H_0$ on the order of a percent and, once accounted for, would correct $H_0$ upward (thus increasing slightly the tension with the CMB). Weak gravitational lensing and simulations may halve to reduce these uncertainties.
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