Dynamical Systematics on Time Delay Lenses and the Impact on the Hubble Constant

Dynamical Systematics on Time Delay Lenses and the Impact on the Hubble Constant
R. For’es-Toribio, C. S. Kochanek, J. A. Mu~noz
arXiv:2602.03934v1 Announce Type: new
Abstract: While time-delay lenses can be an independent probe of $H_0$ the estimates are degenerate with the convergence of the lens near the Einstein radius. Velocity dispersions, $sigma$, can be used to break the degeneracy, with uncertainties $Delta H/H_0 propto Deltasigma^2/sigma^2$ ultimately limited by the systematic uncertainties in the kinematic measurements – measuring $H_0$ to 2% requires $Deltasigma^2/sigma^2$ arXiv:2602.03934v1 Announce Type: new
Abstract: While time-delay lenses can be an independent probe of $H_0$ the estimates are degenerate with the convergence of the lens near the Einstein radius. Velocity dispersions, $sigma$, can be used to break the degeneracy, with uncertainties $Delta H/H_0 propto Deltasigma^2/sigma^2$ ultimately limited by the systematic uncertainties in the kinematic measurements – measuring $H_0$ to 2% requires $Deltasigma^2/sigma^2$