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arxiv: 2112.04510 · v3 · pith:TOIMMXMNnew · submitted 2021-12-08 · 🌌 astro-ph.CO

A Comprehensive Measurement of the Local Value of the Hubble Constant with 1 km/s/Mpc Uncertainty from the Hubble Space Telescope and the SH0ES Team

Adam G. Riess , Wenlong Yuan , Lucas M. Macri , Dan Scolnic , Dillon Brout , Stefano Casertano , David O. Jones , Yukei Murakami
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Louise Breuval Thomas G. Brink Alexei V. Filippenko Samantha Hoffmann Saurabh W. Jha W. D'arcy Kenworthy Gagandeep Anand John Mackenty Benjamin E. Stahl Weikang Zheng
This is my paper

Pith reviewed 2026-05-12 18:01 UTC · model grok-4.3

classification 🌌 astro-ph.CO
keywords Hubble constantCepheidsType Ia supernovaedistance ladderHubble tensioncosmic calibrationgeometric anchors
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The pith

Local Hubble constant measured at 73.04 km/s/Mpc with 1 km/s/Mpc uncertainty, differing by 5 sigma from Planck LCDM prediction.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper presents observations of Cepheids in the hosts of 42 nearby Type Ia supernovae using the Hubble Space Telescope to calibrate the distance ladder. These Cepheids are anchored geometrically through Gaia parallaxes, maser distances in NGC 4258, and detached eclipsing binaries in the Large Magellanic Cloud, all observed with the same instrument to minimize zeropoint offsets. The resulting Hubble constant value is 73.04 plus or minus 1.04 km/s/Mpc after including systematic uncertainties and testing about 70 analysis variants for choices in anchors, dust, metallicity, and sample selections. This local measurement exceeds the value predicted by the Planck satellite data under standard LCDM cosmology by five standard deviations. The discrepancy persists across multiple checks, including consistency with tip-of-the-red-giant-branch distances, pointing to an unresolved tension between direct local measurements and early-universe inferences.

Core claim

The central claim is that a comprehensive Cepheid-calibrated sample of 42 Type Ia supernovae yields H0 equal to 73.04 with an uncertainty of 1.04 km/s/Mpc. This result comes from HST photometry of Cepheids in all suitable low-redshift supernova hosts, calibrated by three independent geometric methods and combined with the Pantheon+ supernova compilation while matching host properties and surveys. The value lies near the median of dozens of analysis variants that vary selections, dust laws, period-luminosity forms, and flows. It differs at the five-sigma level from the H0 of approximately 67.4 km/s/Mpc predicted by Planck plus LCDM, with no evidence that the offset arises from the tested phot

What carries the argument

The Cepheid period-luminosity relation calibrated geometrically by Gaia EDR3 parallaxes, NGC 4258 masers, and LMC detached eclipsing binaries, then applied to standardize Type Ia supernovae for the local magnitude-redshift relation.

If this is right

  • The five-sigma tension with the Planck LCDM prediction remains after all considered variations and is not explained by measurement error.
  • Combining with tip-of-the-red-giant-branch distances in the same hosts produces a consistent value of 72.53 plus or minus 0.99 km/s/Mpc.
  • Extending the fit to include high-redshift supernovae gives H0 of 73.30 plus or minus 1.04 km/s/Mpc and deceleration parameter q0 of minus 0.51 plus or minus 0.024.
  • The result is stable across bifurcations of the sample and simultaneous fits for H(z) at higher redshifts.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • If the tension is real, models that alter the early expansion history or introduce new components would be needed to reconcile local and cosmic microwave background routes to H0.
  • Future space-based observations could test whether crowding corrections or metallicity dependence in Cepheids are underestimated beyond the variants explored.
  • The measured H0 affects derived quantities such as the age of the universe and the inferred strength of dark energy at late times.

Load-bearing premise

That residual systematics from Cepheid crowding, metallicity, or supernova standardization have been fully captured by the seventy analysis variants and do not bias the central Hubble constant value.

What would settle it

An independent geometric distance to one of the supernova host galaxies that deviates by more than 2 km/s/Mpc from the Cepheid-based distance ladder would falsify the central H0 result.

read the original abstract

We report observations from HST of Cepheids in the hosts of 42 SNe Ia used to calibrate the Hubble constant (H0). These include all suitable SNe Ia in the last 40 years at z<0.01, measured with >1000 orbits, more than doubling the sample whose size limits the precision of H0. The Cepheids are calibrated geometrically from Gaia EDR3 parallaxes, masers in N4258 (here tripling that Cepheid sample), and DEBs in the LMC. The Cepheids were measured with the same WFC3 instrument and filters (F555W, F814W, F160W) to negate zeropoint errors. We present multiple verifications of Cepheid photometry and tests of background determinations that show measurements are accurate in the presence of crowding. The SNe calibrate the mag-z relation from the new Pantheon+ compilation, accounting here for covariance between all SN data, with host properties and SN surveys matched to negate differences. We decrease the uncertainty in H0 to 1 km/s/Mpc with systematics. We present a comprehensive set of ~70 analysis variants to explore the sensitivity of H0 to selections of anchors, SN surveys, z range, variations in the analysis of dust, metallicity, form of the P-L relation, SN color, flows, sample bifurcations, and simultaneous measurement of H(z). Our baseline result from the Cepheid-SN sample is H0=73.04+-1.04 km/s/Mpc, which includes systematics and lies near the median of all analysis variants. We demonstrate consistency with measures from HST of the TRGB between SN hosts and NGC 4258 with Cepheids and together these yield 72.53+-0.99. Including high-z SN Ia we find H0=73.30+-1.04 with q0=-0.51+-0.024. We find a 5-sigma difference with H0 predicted by Planck+LCDM, with no indication this arises from measurement errors or analysis variations considered to date. The source of this now long-standing discrepancy between direct and cosmological routes to determining the Hubble constant remains unknown.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

2 major / 2 minor

Summary. This manuscript reports a comprehensive measurement of the Hubble constant using Cepheid variables observed with the Hubble Space Telescope in the hosts of 42 Type Ia supernovae. Calibrated using geometric anchors from Gaia EDR3 parallaxes, masers in NGC 4258, and detached eclipsing binaries in the Large Magellanic Cloud, the analysis yields H0 = 73.04 ± 1.04 km/s/Mpc. The result incorporates extensive tests for systematics, covariance in the Pantheon+ supernova sample, and is shown to be stable across ~70 analysis variants, leading to a 5σ discrepancy with the Planck+ΛCDM prediction.

Significance. Should the central result prove robust, this work would represent a major advancement in resolving or confirming the Hubble tension, with broad implications for our understanding of the Universe's expansion history and possible extensions to the standard cosmological model. The multi-anchor calibration and variant testing provide a strong foundation for the claimed precision.

major comments (2)
  1. [Abstract] The claim of a 5-sigma difference with Planck+LCDM H0 requires explicit quotation of the Planck-derived H0 value and its uncertainty in the main text to substantiate the tension significance.
  2. [Analysis variants section] While the baseline result is near the median of variants, the manuscript should include a summary statistic (e.g., standard deviation or range) of H0 values from the ~70 variants to demonstrate the robustness quantitatively.
minor comments (2)
  1. [Abstract] Clarify the exact previous sample size to support the statement 'more than doubling the sample'.
  2. [Methods] The description of the WFC3 filters could benefit from noting their correspondence to standard bands for broader accessibility.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for their positive assessment of the manuscript and recommendation for minor revision. We address each major comment below.

read point-by-point responses

  1. Referee: [Abstract] The claim of a 5-sigma difference with Planck+LCDM H0 requires explicit quotation of the Planck-derived H0 value and its uncertainty in the main text to substantiate the tension significance.

    Authors: We agree that explicitly quoting the Planck value strengthens the presentation of the tension. In the revised manuscript we will add the specific Planck+ΛCDM H0 value and uncertainty in the main text near the discussion of the 5σ discrepancy. revision: yes

  2. Referee: [Analysis variants section] While the baseline result is near the median of variants, the manuscript should include a summary statistic (e.g., standard deviation or range) of H0 values from the ~70 variants to demonstrate the robustness quantitatively.

    Authors: We appreciate this suggestion for additional quantitative context. In the revised manuscript we will include the standard deviation and range of the H0 values across the ~70 analysis variants in the variants section. revision: yes

Circularity Check

0 steps flagged

No significant circularity; distance ladder uses independent external anchors

full rationale

The derivation proceeds from new HST Cepheid photometry in 42 SN Ia hosts, calibrated via external geometric distances (Gaia EDR3 parallaxes for Milky Way Cepheids, maser distances in NGC 4258, and DEB distances in the LMC). These anchors are independent datasets not generated by the paper's equations or fits. Cepheid distances then set the absolute magnitude scale for the Pantheon+ SN sample (with covariance and host-matching accounted for), yielding H0 from the low-z mag-z relation. The ~70 variants test analysis choices but do not redefine inputs as outputs; the baseline H0 lies near the median without statistical forcing. No self-definitional step, fitted parameter renamed as prediction, or load-bearing self-citation chain appears in the chain. The 5-sigma tension is with an external Planck+LCDM prediction.

Axiom & Free-Parameter Ledger

2 free parameters · 2 axioms · 0 invented entities

The central measurement rests on standard astrophysical assumptions about distance indicators and SN standardization, with several parameters fitted or varied across analysis choices.

free parameters (2)
  • Cepheid period-luminosity zero-point and slope
    Calibrated from anchors but allowed to vary in some analysis variants.
  • Dust extinction law parameters
    Explored through multiple variants in the analysis of dust.
axioms (2)
  • domain assumption Cepheids follow a universal period-luminosity relation independent of host galaxy properties after metallicity corrections
    Invoked when applying the same WFC3 filters and calibration across anchors and SN hosts.
  • domain assumption Type Ia supernovae are standardizable candles after corrections for color, light-curve shape, and host-galaxy properties
    Used to calibrate the magnitude-redshift relation from the Pantheon+ compilation.

pith-pipeline@v0.9.0 · 5805 in / 1585 out tokens · 58400 ms · 2026-05-12T18:01:13.498191+00:00 · methodology

discussion (0)

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