TL;DR
The paper argues that the previously reported galaxy spectral change at redshift ~2.7 is due to a data outlier and not a genuine cosmic transition, emphasizing the importance of data quality.
Contribution
It critically re-evaluates prior findings by identifying the influence of a single outlier, showing the original result was not statistically robust.
Findings
The spectral change at z~2.7 disappears after removing the outlier.
The outlier was caused by a questionable redshift estimate.
The original significance was an artefact of anomalous data.
Abstract
Galikyan et al. (2025) reported a statistically significant change in galaxy spectral properties at redshift 2.7 based on a Kolmogorov Stochasticity Parameter analysis of JWST spectroscopic data of galaxies. In this comment, we demonstrate that their result is critically driven by a single outlier in the dataset. This outlier arises from the use of a questionable redshift estimate for one spectrum. When the outlier is removed or the redshift is corrected, the claimed transition at 2.7 disappears entirely. By independently reproducing their analysis, we demonstrate that the claimed feature is not a robust statistical signal, but an artefact of this anomalous data point.
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