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arxiv: 2506.20707 · v2 · submitted 2025-06-25 · 🌌 astro-ph.CO

Recognition: 2 theorem links

· Lean Theorem

SPT-3G D1: CMB temperature and polarization power spectra and cosmology from 2019 and 2020 observations of the SPT-3G Main field

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Pith reviewed 2026-05-13 19:07 UTC · model grok-4.3

classification 🌌 astro-ph.CO
keywords CMB power spectraSPT-3GHubble constantLCDMCMB lensingcosmological parametersHubble tension
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The pith

SPT-3G measurements of CMB power spectra give H0 = 66.66 km/s/Mpc from ground-based data alone, 6.2 sigma below local values.

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

The paper reports new temperature and E-mode polarization power spectra from deep SPT-3G observations covering 4 percent of the sky, the deepest maps used in any CMB TT/TE/EE analysis so far. These spectra are the most precise at high multipoles for the lensed EE spectrum between l=1800-4000 and the TE spectrum between l=2200-4000. When the spectra are combined with prior SPT-3G lensing measurements, the derived LCDM parameters match those from Planck and ACT-DR6 at similar precision. The resulting Hubble constant stands 6.2 sigma away from local distance-ladder results, while CMB data alone show no requirement for physics beyond standard LCDM.

Core claim

The SPT-3G TT/TE/EE spectra, validated by blind tests, combined with lensing data constrain the standard LCDM model to H0 = 66.66 ± 0.60 km/s/Mpc and other parameters consistent with Planck and ACT-DR6. The joint ground-based (SPT + ACT) primary and lensing data now reach Planck-level constraining power on some parameters, and the three-experiment CMB combination yields the tightest CMB constraints to date with H0 = 67.19 ± 0.38 km/s/Mpc and σ8 = 0.8137 ± 0.0037. CMB data alone show no evidence for physics beyond LCDM, yet a 2.8 sigma tension appears between these CMB results and DESI-DR2 BAO measurements in the standard model.

What carries the argument

The SPT-3G temperature and E-mode polarization angular power spectra from 2019 and 2020 observations, combined with previously published SPT-3G CMB lensing measurements to fit LCDM parameters.

Load-bearing premise

The analysis assumes foreground contamination, instrumental systematics, and lensing effects have been modeled and subtracted correctly, as checked by blind tests.

What would settle it

An independent measurement that recovers an EE spectrum at l=1800-4000 differing by more than the reported uncertainty from the SPT-3G result would falsify the claim of highest precision and change the derived cosmological parameters.

read the original abstract

We present measurements of the temperature and E-mode polarization angular power spectra of the cosmic microwave background (CMB) from observations of 4% of the sky with SPT-3G, the current camera on the South Pole Telescope (SPT). The maps used in this analysis are the deepest used in a CMB TT/TE/EE analysis to date. The maps and resulting power spectra have been validated through blind and unblind tests. The measurements of the lensed EE and TE spectra are the most precise to date at l=1800-4000 and l=2200-4000, respectively. Combining our TT/TE/EE spectra with previously published SPT-3G CMB lensing results, we find parameters for the standard LCDM model consistent with Planck and ACT-DR6 with comparable constraining power. We report a Hubble constant of $H_0=66.66\pm0.60$ km/s/Mpc from SPT-3G alone, 6.2 sigma away from local measurements from SH0ES. For the first time, combined ground-based (SPT+ACT) CMB primary and lensing data have reached Planck's constraining power on some parameters, a milestone for CMB cosmology. The combination of these three CMB experiments yields the tightest CMB constraints to date, with $H_0=67.19\pm0.38$ km/s/Mpc, and the amplitude of clustering $\sigma_8=0.8137\pm0.0037$. CMB data alone show no evidence for physics beyond LCDM; however, we observe a 2.8 sigma difference in LCDM between CMB and baryon acoustic oscillation (BAO) results from DESI-DR2, which is relaxed in extended models. The combination of CMB and BAO yields 2-3 sigma shifts from LCDM in the curvature of the universe, the amplitude of CMB lensing, or the dark energy equation of state. It also drives mild preferences for models that address the Hubble tension through modified recombination or variations in the electron mass in a non-flat universe. This work highlights the growing power of ground-based CMB experiments and lays a foundation for further cosmological analyses with SPT-3G.

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

0 major / 3 minor

Summary. The paper presents measurements of CMB TT, TE, and EE angular power spectra from 2019-2020 SPT-3G observations covering 4% of the sky, using the deepest maps to date in a CMB primary anisotropy analysis. The spectra are validated via blind and unblind tests, with claims that the lensed EE spectrum is the most precise at l=1800-4000 and TE at l=2200-4000. Combining the spectra with prior SPT-3G lensing results yields LCDM parameter constraints consistent with Planck and ACT-DR6 (including H0=66.66±0.60 km/s/Mpc from SPT-3G alone, 6.2σ from SH0ES), while joint analyses with ACT and BAO explore extensions and tensions.

Significance. If the results hold, this constitutes a major advance for ground-based CMB cosmology: SPT+ACT primary plus lensing data now match Planck's constraining power on key parameters for the first time, with the combined three-experiment CMB dataset providing the tightest CMB-only constraints to date. The independent H0 measurement and consistency checks strengthen the case for the Hubble tension while the BAO comparisons highlight opportunities for testing extensions to LCDM.

minor comments (3)
  1. [Abstract, §5] Abstract and §5: The statement that SPT+ACT have 'reached Planck's constraining power on some parameters' would benefit from a brief quantitative comparison (e.g., error-bar ratios on Ω_m or σ_8) rather than a qualitative claim.
  2. [Figure 3, §4.3] Figure 3 and §4.3: The residual plots after foreground subtraction could include the expected noise level from simulations to make the validation more immediately interpretable.
  3. [Table 2] Table 2: The parameter table lists H0 from SPT-3G alone but does not explicitly note whether the quoted uncertainty includes the full covariance with lensing or only primary spectra; a footnote would clarify this.

Simulated Author's Rebuttal

0 responses · 0 unresolved

We thank the referee for their positive review and recommendation to accept the manuscript. We appreciate the recognition of the significance of these SPT-3G results as a milestone for ground-based CMB cosmology.

Circularity Check

0 steps flagged

No significant circularity

full rationale

The paper extracts TT/TE/EE power spectra directly from observed SPT-3G maps using standard map-making and estimation pipelines, validated by blind tests. Cosmological parameters including H0 are obtained by fitting these spectra to external theoretical LCDM predictions. The combination with prior SPT-3G lensing results cites independent previously published work whose constraining power is external to the present spectra. No load-bearing step reduces by construction to a fitted input, self-definition, or unverified self-citation chain; the reported precision statements and 6.2-sigma tension follow from the published likelihood under standard assumptions.

Axiom & Free-Parameter Ledger

2 free parameters · 2 axioms · 0 invented entities

The central claims rest on the validity of the standard LCDM model and on the assumption that data processing has removed all significant foregrounds and systematics; no new physical entities are introduced.

free parameters (2)
  • Hubble constant H0
    Fitted directly to the measured TT/TE/EE spectra within the LCDM model
  • Other LCDM parameters (Omega_m, sigma_8, etc.)
    Fitted to the same spectra; values reported with uncertainties
axioms (2)
  • domain assumption Standard flat Lambda-CDM cosmology governs the evolution of perturbations
    Invoked for all parameter inference and comparison to Planck/ACT
  • domain assumption Foregrounds, noise, and lensing have been accurately modeled and subtracted
    Supported by blind tests but remains a modeling assumption

pith-pipeline@v0.9.0 · 6283 in / 1475 out tokens · 41671 ms · 2026-05-13T19:07:09.171820+00:00 · methodology

discussion (0)

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Lean theorems connected to this paper

Citations machine-checked in the Pith Canon. Every link opens the source theorem in the public Lean library.

  • IndisputableMonolith.Foundation.DAlembert.Inevitability bilinear_family_forced unclear
    ?
    unclear

    Relation between the paper passage and the cited Recognition theorem.

    We present measurements of the temperature and E-mode polarization angular power spectra of the cosmic microwave background (CMB) from observations of 4% of the sky with SPT-3G... Combining our TT/TE/EE spectra with previously published SPT-3G CMB lensing results, we find parameters for the standard LCDM model consistent with Planck and ACT-DR6

  • IndisputableMonolith.Foundation.DimensionForcing dimension_forced unclear
    ?
    unclear

    Relation between the paper passage and the cited Recognition theorem.

    We report a Hubble constant of H0=66.66±0.60 km/s/Mpc from SPT-3G alone, 6.2 sigma away from local measurements from SH0ES.

What do these tags mean?
matches
The paper's claim is directly supported by a theorem in the formal canon.
supports
The theorem supports part of the paper's argument, but the paper may add assumptions or extra steps.
extends
The paper goes beyond the formal theorem; the theorem is a base layer rather than the whole result.
uses
The paper appears to rely on the theorem as machinery.
contradicts
The paper's claim conflicts with a theorem or certificate in the canon.
unclear
Pith found a possible connection, but the passage is too broad, indirect, or ambiguous to say the theorem truly supports the claim.

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