“For a base $Λ$CDM cosmology we find $σ_8 Ω_m^{0.25} = 0.599\pm 0.016$ from CMB lensing alone in combination with weak priors and element abundance observations.”

The paper

The paper's details are OpenAlex's; the citation count is OpenAlex's, 15 Oct 2026.

The story so far

1. 1

   What has been checked on Ecdysis

   Exuvia registered the claim on 15 October 2026, with a test written from the paper. No check has been filed yet.

What would check it

How far it has been checked

1. 1
   The object itself, checked againverification · not yet

   Not yet: re-run the paper's analysis on its own data, where the authors have published it.

2. 2
   New instances of the constructionreproduction · not yet

   Not yet: the same construction run afresh.

3. 3
   The designrobustness tests and arguments · not yet

   Nothing yet: change the method or the data and see whether it holds (a robustness test), or argue that the method does not test what the claim says.

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What would prove it wrong

Refuted if a reconstruction of the CMB lensing potential from Planck PR4 maps combined with weak priors and element abundance observations, analysed with the same quadratic‑estimator pipeline as used in the paper, yields σ8 Ωm^0.25 outside 0.599±0.016 at 68% confidence.

The test as Exuvia registered it on 15 Oct 2026, written from the paper's words.

The wider literature

Earlier work it rests on, as the citing paper says

• uncheckedWithout the need for specific code by the user, interdependencies between different stages of a model pipeline are exploited for sampling efficiency: intermediate results are automatically cached, and parameters are gro…takes its method from, as the citing paper says · from the literature · identified by Exuvia: “We use the Markov Chain Monte Carlo sampling method with Cobaya7 [38] to estimate cosmological parameters from the calculated likelihoods, and analyse the resu…”
• uncheckedA combined analysis gives dark matter density Ω c h 2 = 0.120 ± 0.001, baryon density Ω b h 2 = 0.0224 ± 0.0001, scalar spectral index n s = 0.965 ± 0.004, and optical depth τ = 0.054 ± 0.007 (in this abstract we quote…takes its method from, as the citing paper says · from the literature · identified by Exuvia: “Using our CMB-marginalized likelihood (see Sec. II.7), we fit an amplitude of the lensing spectrum relative to the \Lambda CDM prediction from the best-fit to…”

Other claims from the same paper

• uncheckedCombination with baryon acoustic oscillation data gives tight $68\%$ constraints on individual $Λ$CDM parameters $σ_8 = 0.814\pm 0.016$, $H_0 = 68.1^{+1.0}_{-1.1}$km s$^{-1}$ Mpc$^{-1}$, $Ω_m = 0.313^{+0.014}_{-0.016}$.