This cosmology study asks whether apparent evidence for dynamical dark energy survives replacement of DES-SN5Y supernova data with the revised DES-Dovekie compilation alongside DESI DR2 BAO and CMB. Preference over ΛCDM falls substantially and is below 1σ for most models.
Key findings
- DES-SN5Y more strongly favors dynamical dark energy, with redshift-dependent models tending toward w0>-1 and wa
Why this matters globally
Whether dark energy evolves is foundational physics. This result cautions against premature discovery claims and shows that supernova systematic control can matter as much as model complexity.
Thai researcher contribution
A Walailak University researcher participated in an international frontier-cosmology analysis testing robustness across datasets and model families.
Limitations to consider
Results depend on compressed likelihoods, priors, model choices, and each compilation's systematic treatment. Below 1σ does not prove ΛCDM ultimately correct; it indicates insufficient evidence for extensions here. Testing many models also raises multiplicity concerns.