Fit direction and BAO components
Individual run · T-0a42d5a1d364
Public summary of an internal test, not yet independently validated or published.
Question investigated
Does the direction of the preference for evolving dark energy in Pantheon+, DES-SN5YR and Union3 persist when the BAO groups at the ends and center of the redshift range are excluded, with the prior Ωm = 0.3 ± 0.01?
Test conditions
For each supernova compilation (Pantheon+, DES-SN5YR and Union3), the fit is repeated with one DESI DR2 BAO group excluded at a time. The groups contain measurements at z = (0.295, 2.33); (0.51, 0.706, 0.934, 1.321, 1.484). The adopted prior is Ωm = 0.3 ± 0.01. This grouping belongs to a set of three prespecified partitions; the assumptions and estimator are unchanged.
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
The test measures the robustness of the preference to the BAO data selection and the supernova compilation. Its scope is internal to this comparison; a global assessment also requires the cosmic microwave background and the structure power spectrum.