6 citations · 16 across the 10 of their papers we have counts for
12 papers
TDCOSMO 2026: new insights on the Hubble tension from strong lensing time delays
TDCOSMO Collaboration, Simon Birrer, Michele Cappellari +26
We discuss the measurement of the Hubble constant () in flat cold dark matter cosmology based on the blind hierarchical analysis of 11 multiply-imaged quasars (hereafter t…
TDCOSMO 2026: A 3% measurement of the Hubble constant from strong lensing and stellar kinematics
TDCOSMO Collaboration, Simon Birrer, Michele Cappellari +26
We present cosmological constraints from 11 strongly lensed quasars with measured time delays (hereafter, the TDCOSMO-2026 sample). In addition to expanding the sample, we improve…
TDCOSMO XXXI: New techniques in line-of-sight studies of time delay lenses
Daniel Johnson, Devon Williams, Chris Fassnacht +5
The distribution of matter along the same line of sight but external to the main lens, quantified by , is a key source of uncertainty in time delay cosmography and…
Cosmology with the line-of-sight shear of strong gravitational lenses
Pierre Fleury, Daniel Johnson, Théo Duboscq +2
Stage-IV photometric galaxy surveys are designed to measure the position and shapes of billions of galaxies. Their aim is to characterise the large-scale distribution of matter in…
Degeneracies and modelling choices in double-plane time-delay cosmography
Daniel Johnson, Pierre Fleury, Martin Millon
Double-plane gravitational lensing is a rare but increasingly observed phenomenon in which the light from a distant source is lensed by two foreground objects at different redshift…
Les Houches on Dark Universe 2025: Elements of cosmology beyond FLRW
Pierre Fleury
Modern cosmology is based on the cosmological principle, which states that the Universe is statistically homogeneous and isotropic. When applied in its strict -- rather than statis…
Sparsity covariance: a source of uncertainty when estimating correlation functions with a discrete sample of observations in the sky
Pierre Fleury
Cosmological observables rely heavily on summary statistics such as two-point correlation functions. In many practical cases (e.g. the weak-lensing cosmic shear), those correlation…
Line-of-sight effects on double source plane lenses
Daniel Johnson, Thomas Collett, Tian Li +1
Weak gravitational lensing perturbations have a non-negligible impact on strong lensing observables, and several degeneracies exist between the properties of the main lens, line of…
Cosmic shear with Einstein rings
Pierre Fleury
Cosmic shear is a key probe of modern cosmology. Amongst its challenges are shape noise and intrinsic alignments, both due to our ignorance of the unlensed shape of the source gala…
Emergent Cosmological Expansion in Scalar-Tensor Theories of Gravity
Chad Briddon, Timothy Clifton, Pierre Fleury
We consider the emergence of large-scale cosmological expansion in scalar-tensor theories of gravity. This is achieved by modelling sub-horizon regions of space-time as weak-field…
Weak lensing of strong lensing: beyond the tidal regime
Théo Duboscq, Natalie B. Hogg, Pierre Fleury +1
The analysis of strong lensing images usually involves an external convergence and shear, which are meant to model the effect of perturbations along the line of sight, on top of th…
Foreground biases in strong gravitational lensing
Daniel Johnson, Pierre Fleury, Julien Larena +1
Strong gravitational lensing is a competitive tool to probe the dark matter and energy content of the Universe. However, significant uncertainties can arise from the choice of lens…