Investigating the redshift evolution of lensing galaxy density slopes via model-independent distance ratios
Published in , 2025
This study confirms that the redshift evolution of the matter density slopes in lensing galaxies can be determined independent of dark energy models at the population level. The Legacy Survey of Space and Time (LSST) Rubin Observatory forecasts are expected to identify 100 000 strongly lensed galaxies. We show based on simulations with data from the LSST that spectroscopic follow up of just 10% of these systems can reduce the uncertainty in the redshift evolution coefficient of the total mass density slope (Δ∂γ/∂z) to 0.021. This precision would be able to distinguish between evolving and nonevolving scenarios for lensing galaxies.
Recommended citation: A&A, 694, A196 (2025)
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