Constraints on dark energy from TDCOSMO & SLACS lenses

Abstract

Problems with the cosmological constant model of dark energy motivate the investigation of alternative scenarios. I make the first measurement of the dark energy equation of state using the hierarchical strong lensing time delay likelihood provided by TDCOSMO. I find that the combination of seven TDCOSMO lenses and 33 SLACS lenses is only able to provide a weak constraint on the dark energy equation of state, $w<-1.75$ at 68% confidence, which nevertheless implies the presence of a phantom dark energy component. When the strong lensing time delay data is combined with a collection of cosmic microwave background, baryon acoustic oscillation and Type Ia supernova data, I find that the equation of state is $w=-1.025\pm 0.029$.

arXiv comment6 pages, 6 figures. V2 matches version published in MNRAS Letters

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• Lens Modeling of STRIDES Strongly Lensed Quasars using Neural Posterior Estimation
• The COSMOS-Web Lens Survey (COWLS) III: forecasts versus data