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Keyword: scalar field dark energy ×Clear all

4 claims from 2 papers

1. Physics and Astronomy › Cosmology and Gravitation Theories

   Dynamical Dark Energy and the Unresolved Hubble Tension: Multi-model Constraints from DESI 2025 and Other Probes

   Zhang, Xu and Chen · The Astrophysical Journal · 2026

   A Bayesian comparison of five cosmological models using DESI DR2, Pantheon+ and Planck/ACT CMB data finds a persistent Hubble tension and reports evidence that dark energy evolves over cosmic time.

   Unchecked3 claims
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   1. UncheckedCMB data favour phantom dark energy (w < -1) while BAO and supernova data prefer quintessence (w > -1), which the authors read as evidence of evolving dark energy.“Second, we find compelling evidence for dynamical dark energy: early-universe (CMB) constraints favor a phantom phase (with an equation-of-state parameter $w < -1$), while late-universe (BAO/SNIa) data prefer quintessence ($w > -1$).”
   2. UncheckedThe paper says its combined dataset suggests dark energy and matter interact at late times in the universe's history.“Third, the full dataset suggests a late-time interaction between dark energy and matter.”
   3. UncheckedCombining DESI, supernova and CMB data, the Hubble constant matches early-universe values in all five models tested, so the Hubble tension persists.“First, the Hubble constant ($H_0$) inferred from the combined data consistently aligns with early-universe measurements across all models, indicating a persistent Hubble tension.”

2. Physics and Astronomy › Cosmology and Gravitation Theories

   Unifying early and late dark energy: dynamical requirements and obstructions

   Giarè and Sakstein · Journal of Cosmology and Astroparticle Physics · 2026

   Unchecked1 claim
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   1. Unchecked“We show that satisfying all requirements necessitates a potential with three distinct slopes, arranged in a steep-steeper-shallow hierarchy.”