BAO priors and dark-energy robustness
Individual run · T-ed9ca90519ff
Public summary of an internal test, not yet independently validated or published.
Question investigated
With a BAO scale-parameter prior of 30 ± 8 and Ωm = 0.315 ± 0.007, does the preference for dynamical dark energy in Pantheon+ and Union3 persist after excluding each tracer block?
Test conditions
Fit Pantheon+ and Union3 with Ωm = 0.315 ± 0.007 and a BAO scale-parameter prior of 30 ± 8. Separately exclude the three BAO blocks from DESI DR2 at z = (0.295, 0.51, 0.706); (0.934, 1.321, 1.484); (2.33). Compare the response of the fits while varying only the width of the acoustic-ruler calibration prior.
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
The analysis measures sensitivity to the width of the acoustic-ruler prior in the adopted model. This test provides neither a physical calibration of the ruler nor an independent constraint on the early Universe.