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Keyword: supernova sample ×Clear all

3 claims from 1 paper

1. Physics and Astronomy › Cosmology and Gravitation Theories

   Revisiting the evidence for dynamical dark energy: from DES-SN5Y to DES-Dovekie

   Kandel, Atamurotov, Güdekli, Channuie and Rakhimova · The European Physical Journal C · 2026

   The paper re-tests dynamical dark energy with DES-Dovekie supernova data in place of DES-SN5Y, and finds the earlier preference for it is substantially weaker.

   Unchecked3 claims
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   1. UncheckedWith the revised DES-Dovekie supernova data, the preference for dynamical dark energy over ΛCDM falls below 1σ for most models, and evidence turns weak or inconclusive.“The improvement over $$\Lambda $$ Λ CDM drops to below the $$1\sigma $$ 1 σ level for most models, and the Bayesian evidence weakens from moderate to weak or inconclusive.”
   2. UncheckedDark energy models that let w change with redshift favour w0 above -1 and wa below 0, a Quintom-B-type evolution that crosses the phantom divide.“In particular, redshift-dependent parametrizations favor the region $$w_0 > -1$$ w 0 > - 1 and $$w_a < 0$$ w a < 0 , corresponding to a Quintom-B–type evolution with phantom crossing.”
   3. UncheckedUsing DES-Dovekie or the DES-SN5Y (z>0.1) subset, the preference for dynamical dark energy is weaker than with the full DES-SN5Y supernova sample.“Overall, the DES-Dovekie and DES-SN5Y $$(z>0.1)$$ ( z > 0.1 ) datasets weaken the preference for dynamical dark energy compared to the full DES-SN5Y dataset.”