Dependence on BAO tracer families
Individual run · T-49f1cff5d374
Public summary of an internal test, not yet independently validated or published.
Question investigated
Does the preference for evolving dark energy in Pantheon+ and Union3 persist when the BAO tracer families are excluded, with the prior Ωm = 0.315 ± 0.007?
Test conditions
For each supernova compilation (Pantheon+ and Union3), the fit is repeated with one BAO group excluded at a time. The groups contain measurements at z = (0.51, 0.706, 0.934); (0.934, 1.321); (1.484, 2.33). The adopted prior is Ωm = 0.315 ± 0.007. The supernova data and comparison criteria are held fixed. The comparison tracks fit quality and the direction of the preference in dark-energy parameters. The families compared are red galaxies, emission-line galaxies and the quasar group with Lyman-alpha.
Result
The direction of the preference for evolving dark energy persisted after each group was excluded. The result demonstrates internal robustness for the data and groupings examined, without establishing a global detection.
Physical interpretation
Excluding tracer groups reveals where the fit improvement is concentrated. The test does not determine the cause of that concentration.