We present strong evidence for dynamical dark energy challenging the ΛCDM model. Several dark energy models are explored, including ω₀ωₐCDM, logarithmic, Exponential, JBP, and BA, along with non-flat cosmologies accounting for potential spatial curvature. Our analysis supports a flat Universe (Ωₖ 0). Using the Metropolis-Hastings MCMC algorithm, we analyze data from BAO of DESI DR2, Type Ia Supernovae, and CMB to constrain model parameters. We find strong evidence that ω -1, with deviations from ΛCDM favoring dynamical dark energy consistent with the Quintom-B scenario (ω₀ > -1, ωₐ 3σ tensions with DES-SN5YR or Union3, hinting at cracks in the cosmological constant Λ.
Chaudhary et al. (2025) studied this question.