vf_8f99815ab33eeb12 · finding

Finding bundle

The TDCOSMO program measured H0 = 73.3 ± 1.8 km/s/Mpc from six lensed quasar systems (B1608+656, RXJ0911, HE1104, SDSSJ1206, WFI2033, PG1115), consistent with early-universe measurements and in ~3σ tension with Planck CMB + ΛCDM.

3inferred

id: vf_8f99815ab33eeb12
frontier: Hubble tension
version: 1
confidence: 0.92

record state

frontier-owned

Review status

This finding is part of accepted frontier state. Review events, reviewable changes, and proof state explain how it can change.

unreviewed

finding statement

finding type

observational

No entity list is declared.

evidence

source-bound

1 atoms

theoretical · manual state transition

proof impact

packet context

1 events

1 reviewable changes and 0 evaluation records are attached to this finding id.

Evidence and conditions

method

manual state transition

evidence type

theoretical

conditions

species_unverified
species_verified
text: Based on 2019-2021 data release; updated results may refine tension signature

Provenance

source title

H0LiCOW & TDCOSMO Collaboration

doi

10.1093/mnras/stab2582

authors

reviewer:will-blair

Source records

1

source record

H0LiCOW & TDCOSMO Collaboration

vs_f15337593ec1279f

doi:10.1093/mnras/stab2582 · 10.1093/mnras/stab2582

2021manual_curation

inspect source →

Evidence atoms

1

vea_b60d11aa0e30166atheoretical · unknown
The TDCOSMO program measured H0 = 73.3 ± 1.8 km/s/Mpc from six lensed quasar systems (B1608+656, RXJ0911, HE1104, SDSSJ1206, WFI2033, PG1115), consistent with early-universe measurements and in ~3σ tension with Planck CMB + ΛCDM.
vs_f15337593ec1279f · manual_curation

Typed links

6

outgoing

dependsvf_5b27ad45c15f3d67
TDCOSMO's high H0 depends on controlling systematics from line-of-sight structure
extendsvf_5b27ad45c15f3d67
TDCOSMO results probe a unique redshift baseline (z~0.5–0.9) independent of Planck and SNe Ia
dependsvf_c1c56430ca37272b
TDCOSMO + GW170817 combined tension signal depends on systematics not being correlated

incoming

Time-delay strong lensing of multiply-imaged quasars measures H0 independent of the cosmic distance ladder by inverting the Fermat principle: lensing geometry + time delays between images + stellar dynamics yield absolute distance without redshift ladder or supernovae calibration.
supports · vf_98ffef549c3a1b1e
Core-cusp problem in lens galaxies (disagreement between dark matter density profiles from collisionless N-body simulations and observations) does not materially bias H0 measurements if stellar-only models are used and degeneracies with external shear are broken by high-resolution imaging.
contradicts · vf_80ce1c98fde71f88
Modified gravity theories (e.g., f(R), scalar-tensor) can be constrained using time-delay lensing because they alter the lensing geometry-H0 relation; current strong lensing data weakly disfavor extreme modifications but cannot yet exclude them at high confidence.
depends · vf_460bd8b94b782620

Review, event, and evaluation records

2

events

vev_a981db0a97a20694finding.asserted
Manual finding added to frontier state
reviewer:will-blair · 2026-05-29

reviewable changes

vpr_6b0861ad7405dcedfinding.add
Manual finding added to frontier state
applied · reviewer:will-blair · 2026-05-29

evaluations

No evaluation record targets this finding id.