AWhat changed
The SARAS 3 radiometer measured a sky-averaged radio spectrum and compared it with the absorption profile previously reported by EDGES. With the paper’s foreground and calibration model, its fit disfavoured the earlier best-fitting profile at 95.3% confidence; the authors also tested the wider set of profiles allowed by EDGES.
Scientific scope
The SARAS 3 radiometer measured a sky-averaged radio spectrum and compared it with the absorption profile previously reported by EDGES. With the paper’s foreground and calibration model, its fit disfavoured the earlier best-fitting profile at 95.3% confidence; the authors also tested the wider set of profiles allowed by EDGES. This is an independent observational challenge to a specific earlier best-fit profile, not a detection of the cosmic-dawn 21-cm signal or proof that every possible 21-cm absorption profile is absent. The reported 95.3% applies to one best-fit template; the paper gives 90.4% for the weighted set of allowed profiles. Results rely on the selected 55–85 MHz science band, sixth-order foreground model, assumed systematic-error treatment and finite sensitivity. The cause of the EDGES spectral feature is not independently identified. The EDGES report is recorded separately with its own authors.
Evidence
The linked original works support the scoped statement and contribution attribution. WRS has not independently replayed experiments or reconstructed a full mathematical proof. This is an independent observational challenge to a specific earlier best-fit profile, not a detection of the cosmic-dawn 21-cm signal or proof that every possible 21-cm absorption profile is absent. The reported 95.3% applies to one best-fit template; the paper gives 90.4% for the weighted set of allowed profiles. Results rely on the selected 55–85 MHz science band, sixth-order foreground model, assumed systematic-error treatment and finite sensitivity. The cause of the EDGES spectral feature is not independently identified. The EDGES report is recorded separately with its own authors.
Contributors
- The named authors in the research record · SCIENCE: These are the listed authors of the cited contribution sources. Paper authorship does not quantify individual effort. An incomplete list is explicitly marked; same names are not automatically merged.
Provisional WRS assessment, edition 2026-10-28.1. Independent expert calibration is pending. This grade does not certify correctness or assign ownership.
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