Fit direction and BAO components
Individual run · T-77b711df9733
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 galaxy and Lyman-alpha forest BAO groups are excluded, with the prior Ωm = 0.315 ± 0.02?
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, 0.51, 0.706, 0.934, 1.321, 1.484); (2.33). The adopted prior is Ωm = 0.315 ± 0.02. 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.