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 $w=-1.025\pm 0.029$.

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

References in corpus (4)

• Dynamics of dark energy
• The Clustering of the SDSS DR7 Main Galaxy Sample I: A 4 per cent Distance Measure at z=0.15
• Crossing the Phantom Divide with Parameterized Post-Friedmann Dark Energy
• On the Choice of Lens Density Profile in Time Delay Cosmography

Cited by in corpus (6)

• Robust Preference for Dynamical Dark Energy in DESI BAO and SN Measurements
• Scalar field dark energy models: Current and forecast constraints
• Dynamical Dark Energy in the Crosshairs: A Joint Analysis with DESI, Pantheon plus, and TDCOSMO Constraints
• The COSMOS-Web Lens Survey (COWLS) I: Discovery of >100 high redshift strong lenses in contiguous JWST imaging
• Lens Modeling of STRIDES Strongly Lensed Quasars using Neural Posterior Estimation
• The COSMOS-Web Lens Survey (COWLS) III: forecasts versus data