Dependence on BAO tracer families
Individual run · T-e983e9fee653
Public summary of an internal test, not yet independently validated or published.
Question investigated
Does the preference for evolving dark energy in Pantheon+, DES-SN5YR and Union3 persist when the BAO tracer families are excluded?
Test conditions
For each supernova compilation (Pantheon+, DES-SN5YR 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 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 tracer groups had unequal influence on the fit. The comparison showed neither independence from every group nor exclusive dependence on a single group.
Physical interpretation
Excluding tracer groups reveals where the fit improvement is concentrated. The test does not determine the cause of that concentration.