What question did this study set out to answer?

The study aims to evaluate the performance of the CDN-242 κ-proxy on a new set of SPT-SZ clusters.

June 18, 2026Open Access

CDN-251: The Cross-Survey Test — Locked κ-Proxy on 516 SPT-SZ Clusters

Key Points

The study aims to evaluate the performance of the CDN-242 κ-proxy on a new set of SPT-SZ clusters.
Applied κ-proxy to 516 SPT-SZ clusters with no overlap in selection criteria.
Cross-matched 337 of these clusters with eROSITA DR1 to assess X-ray morphology.
Utilized a seven-term logistic proxy model trained on 25 previous lensing clusters.
Achieved a 98.8% success rate in-band across CDN-249 empirical bands with 510 of 516 clusters.
No cap violations were detected, maintaining high integrity in analysis.
The bound for non-GCFT dark matter was confirmed at scale with a threshold of ≤0.29%.

Abstract

First execution of the CDN-242 κ-proxy on a completely independent survey. The seven-term logistic proxy, trained on 25 CLASH lensing clusters and locked since CDN-243, is applied to 516 confirmed SPT-SZ 2500d clusters (Bocquet et al. 2019) with no overlap in selection function, mass calibration, or observing strategy. 337/516 are cross-matched with eROSITA DR1 for real X-ray morphology. Result: PASS — 510/516 (98.8%) in-band by CDN-249 empirical bands, 0 cap violations, 99.13% mean closure. The CDN-242 population bound (≤0.29% non-GCFT dark matter) holds at scale. Includes execution script, full per-cluster results JSON, and Art Edition.

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