What question did this study set out to answer?

To consolidate and synthesize the RA_Q3 diagnostic ladder and follow-up tests with a focus on robustness and sensitivity evaluation.

May 20, 2026Open Access

v5 — RAQ3 diagnostic synthesis with robustness stress-test ladder

Key Points

To consolidate and synthesize the RA_Q3 diagnostic ladder and follow-up tests with a focus on robustness and sensitivity evaluation.
Consolidation of various diagnostic tests into a single synthesis bundle.
Implementation of robustness stress tests including redshift-floor and calibrator-removal.
Comparative analysis of Pantheon+ minus-Foundation RA_Q3-band and Foundation-only results.
Foundation-only DES-SN5YR RA_Q3 sector remains object-pair robust but is sensitive to sector variability.
In non-calibrator zHD >= 0.023 cut, only 3 out of 338 RA windows are as negative as DES RA_Q3 band; in zHD >= 0.025, only 2 out of 327.
Pantheon+ minus-Foundation shows an external negative-residual echo surviving multiple stress tests.

Abstract

Version 5 consolidates the DES-SN5YR Foundation RAQ3 diagnostic ladder and Pantheon+ minus-Foundation RAQ3-band follow-up tests into a single synthesis bundle. This update summarizes the full progression from Foundation-only object-pair robustness to sky-sector sensitivity, RAQ3 anatomy, metadata inventory, controlled residual regression, velocity/redshift-frame diagnostics, Pantheon+ minus-Foundation RAQ3-band comparison, duplicate-name collapse, redshift-floor and calibrator-removal stress tests, same-width RA-window look-elsewhere comparison, and redshift-matched outside-band resampling. The updated interpretation is that the Foundation-only DES-SN5YR RAQ3 sector remains object-pair robust but sector sensitive. In Pantheon+ minus Foundation, the same RA band shows an external negative-residual echo that survives duplicate-name collapse, calibrator removal, redshift-floor stress, same-width RA-window look-elsewhere comparison, and redshift-matched outside-band resampling. In cleaner non-calibrator high-floor cuts, the DES RAQ3 band lies in the negative tail of same-width RA windows and is rarely reproduced by redshift-matched outside-band draws. For example, in the non-calibrator zHD >= 0. 023 cut, the same-width RA-window fraction is 3/338 = 0. 008876, and only 1/20, 000 redshift-matched outside-band draws is as negative or more negative than the observed RAQ3 contrast. In the non-calibrator zHD >= 0. 025 cut, the same-width RA-window fraction is 2/327 = 0. 006116, and 0/20, 000 redshift-matched outside-band draws are as negative or more negative than the observed RAQ3 contrast. This update remains a robustness and reproducibility synthesis only. It does not establish cosmological anisotropy, a preferred cosmic axis, URSF confirmation, independent Pantheon+ replication, causal explanation, or elimination of local-flow, calibration, selection, or compilation systematics. Version 5 adds a consolidated RAQ3 diagnostic synthesis and robustness stress-test ladder. The synthesis summarizes the DES-SN5YR Foundation-only RAQ3 sector result and the Pantheon+ minus-Foundation RAQ3-band follow-up tests. The diagnostic ladder includes object-pair robustness, grouped sky-sector leaveout, RAQ3 anatomy, metadata inventory, controlled residual regression, velocity/redshift-frame sensitivity, Pantheon+ minus-Foundation band comparison, duplicate-name collapse, redshift-floor and calibrator-removal stress tests, same-width RA-window look-elsewhere comparison, and redshift-matched outside-band resampling. The main updated interpretation is that the Foundation-only DES-SN5YR RAQ3 sector remains object-pair robust but sector sensitive. In Pantheon+ minus Foundation, the same RA band shows an external negative-residual echo that survives several mundane-composition stress tests, including duplicate-name collapse, calibrator removal, redshift-floor stress, same-width RA-window look-elsewhere comparison, and redshift-matched outside-band resampling. The strongest cleaner-cut Pantheon+ minus-Foundation results occur in non-calibrator high-redshift-floor subsets. In the non-calibrator zHD >= 0. 023 cut, only 3 out of 338 same-width RA windows are as negative or more negative than the DES RAQ3 band, and only 1 out of 20, 000 redshift-matched outside-band draws is as negative or more negative. In the non-calibrator zHD >= 0. 025 cut, only 2 out of 327 same-width RA windows are as negative or more negative, and 0 out of 20, 000 redshift-matched outside-band draws are as negative or more negative. This remains a robustness clue only. It does not claim discovery, cosmological anisotropy, a preferred axis, URSF confirmation, independent replication, or causal explanation. DES-SN5YRᵦenododesᵣ3foundationᵣaq3diagnosticₛynthesisᵥ5bundle. tar. gz v5 RAQ3 diagnostic synthesis bundle. Contains the consolidated DESR3FOUNDATIONRAQ3DIAGNOSTICSYNTHESISV5. md document, prior RAQ3 diagnostic synthesis file, checkpoint documents for sky-sector leaveout, RAQ3 anatomy, metadata inventory, controlled regression, velocity-frame diagnostics, Pantheon+ minus-Foundation RAQ3-band comparison, duplicate-name collapse, redshift-floor and calibrator-removal stress, same-width RA-window look-elsewhere control, and redshift-matched outside-band resampling. Also includes key diagnostic figures for duplicate collapse, redshift-floor stress, look-elsewhere comparison, and redshift-matched resampling. SHA256: 400a0666f153c9bb5a61b01be30648f7acefa75be6c322c46e1c14fea69380df

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