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2017

Large-Distance Lens Uncertainties and Time-Delay Measurements of $H_0$

Muñoz, Julian B., Kamionkowski, Marc

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Given the tension between the values of the Hubble parameter $H_0$ inferred from the cosmic microwave background (CMB) and from supernovae, attention is turning to time delays of strongly lensed quasars.

Current time-delay measurements indicate a value of $H_0$ closer to that from supernovae, with errors on the order of a few percent, and future measurements aim to bring the errors down to the subpercent level.
Here we consider the uncertainties in the mass distribution in the outskirts of the lens.
We 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).

Large-Distance Lens Uncertainties and Time-Delay Measurements of $H_0$ · Around

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