Two-rung ladder: H 0 from Tip of the Red Giant Branch and geometric anchors alone

arXiv:2609.29996 · astro-ph.CO, astro-ph.GA · Submitted 2026-09-24 · Read on arXiv

astro-ph.CO, astro-ph.GA

Submitted: 2026-09-24

Updated: 2026-09-24

Terminology

• Calibration — 25× in this paper · explained in 7 episodes
• Generative Model — 5× in this paper · explained in 2 episodes
• Velocity Dispersion — 3× in this paper · explained in 2 episodes
• Degeneracy — 2× in this paper · explained in 3 episodes
• Extragalactic Distance Database — 2× in this paper
• Metallicity — 2× in this paper · explained in 3 episodes
• Trace — 2× in this paper · explained in 2 episodes
• Adam — 1× in this paper · explained in 2 episodes
• Bispectrum — 1× in this paper · explained in 3 episodes
• Clustering — 1× in this paper · explained in 2 episodes
• Consistency — 1× in this paper · explained in 3 episodes
• Core — 1× in this paper · explained in 2 episodes
• Hubble Space Telescope — 1× in this paper
• Hubble Tension — 1× in this paper · explained in 9 episodes
• Matter Power Spectrum — 1× in this paper · explained in 2 episodes

Sources

• Gathering Galaxy Distances in Abundance with Roman Wide-Area Data
• Surface Brightness Fluctuations
• Illuminating the Local Universe: Large-Scale Structure from ZTF Type Ia Supernovae
• Accounting for sample selection in Bayesian analyses
• The No-U-Turn Sampler: Adaptively Setting Path Lengths in Hamiltonian Monte Carlo
• The Tip of the Red Giant Branch Distance Ladder and the Hubble Constant
• Machine learning assisted Bayesian model comparison: learnt harmonic mean estimator
• Composable Effects for Flexible and Accelerated Probabilistic Programming in NumPyro
• Learned harmonic mean estimation of the marginal likelihood with normalizing flows
• A reanalysis of the megamaser Hubble constant: from spot catalogues to peculiar velocities

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