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Small calibration errors between nearby and distant supernovae could fake the signal.","posed_since":"2025","precise":"The DESI DR2 preference for $w0-wa$ ranges from about $2.8\\text{ to }4.2\\sigma$ across Pantheon+, Union3 and DES-Y5, and the 2025 DES reanalysis (Dovekie) lowered the DES value. Determine whether a distance-modulus offset of order $0.04\\,\\mathrm{mag}$ between low-redshift ($z < 0.1$) and high-redshift supernovae, from photometric calibration, selection, or host-galaxy dust and age evolution, accounts for the signal. Answer: identification of such a systematic or a demonstration that all such offsets are below $0.01\\,\\mathrm{mag}$.","problem_ref":"0eced1b07c18da050629e5aee37dbfab00ff3c2c1f9943ca0e014a0d85ed4364","references":"","settled_by":"A single-survey supernova sample spanning $0 < z < 1$ on one photometric system, cross-checked against BAO-only and CMB-only fits.","status_note":"The 2025 DES-Dovekie recalibration reduced the preference from 4.2 to about $3.2\\sigma$ with DESI DR2 and CMB.","title":"Are evolving dark energy hints driven by supernova 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