Individual exclusions and matter priors
Individual run · T-aac11d5dfccf
Public summary of an internal test, not yet independently validated or published.
Question investigated
In Pantheon+ and Union3, with Ωm = 0.315 ± 0.007, does the preference for dynamical dark energy persist after the separate exclusion of the red-galaxy group, the emission-line-galaxy group, and the combined quasar and Lyman-alpha-forest group?
Test conditions
Refit Pantheon+ and Union3 after excluding, one at a time, the 3 DESI BAO groups at z = (0.51, 0.706, 0.934); (0.934, 1.321); (1.484, 2.33). Hold the supernova data and cosmic microwave background constraints fixed. Adopt Ωm = 0.315 ± 0.007. Compare fit quality and shifts in the dark-energy parameters.
Result
The preference for dynamical dark energy retained the same direction in every tested group exclusion. This stability is limited to the analyzed data, priors and groupings; it does not establish a globally significant detection.
Physical interpretation
This test measures how much each BAO tracer group contributes to the cosmological preference. Sensitivity to a group alone does not identify its physical or observational cause.