What question did this study set out to answer?

This research aims to assess the performance of the CDN-242 κ-proxy through three different survey tests.

June 18, 2026Open Access

CDN-252: The Three Surveys — eROSITA, ACT DR5, and F-Class Closure

Key Points

This research aims to assess the performance of the CDN-242 κ-proxy through three different survey tests.
Conducted tests on clusters from eROSITA DR1, ACT DR5, and a targeted F-class search.
Analyzed 9,700 clusters using X-ray, SZ, and lensing selections across a wide redshift range.
Evaluated proxy performance with emphasis on cluster mass and gas metrics.
eROSITA DR1 achieved 96.5% in-band accuracy with no cap violations for M200 clusters.
ACT DR5 reported 99.7% in-band accuracy and 97.37% closure, representing the cleanest results.
F-class search found 0 F-class clusters; 332 out of 333 confirmed as E-class after correction.

Abstract

Three simultaneous tests of the locked CDN-242 κ-proxy. (a) eROSITA DR1 cosmology subsample (5, 012 clusters with real TX, Mgas, DCOMB — richest vectors in the programme): PASS at M200 ≥ 0. 5×10¹4 M☉ (96. 5% in-band, 0 cap violations) ; raw CONFLICT traced to 12 galaxy groups below the proxy's training floor. (b) ACT DR5 (4, 195 SZ-selected clusters, Hilton+2021): PASS — 99. 7% in-band, 0 cap violations, 97. 37% closure — cleanest result in the programme. (c) F-class targeted search (333 relaxed massive eROSITA clusters): 0 F-class found; 332/333 are E-class. F-class is an artefact of the CDN-240 6-parameter proxy, eliminated by the CDN-242 7-term quadratic-λ correction. Taxonomy reduced from E/S/P/F to E/S/P. Combined: the proxy passes on ~9, 700 clusters across four independent surveys spanning lensing, SZ, and X-ray selection from z=0. 04 to z=1. 91. Includes execution script, full per-cluster results JSON, and Art Edition.

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