Brought to you by embersilk.com. A deep dive into how strong gravitational lensing time delays offer an independent route to measuring the Hubble constant. We'll unpack the mass-sheet degeneracy, the role of stellar kinematics and line-of-sight mass, and the latest results from the TDCOSMO collaboration. Simple lens models tend to yield H0 around 73 km/s/Mpc, aligned with local measurements, while more flexible, kinematics-informed models pull H0 toward the Planck value but with larger uncertainties. We discuss what this means for lambda cold dark matter cosmology and whether resolving the tension might point to new physics—or simply demand better modeling and more data.
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