Introduces curvature diagnostic C = ρ_DE''/ρ_DE for two-fluid interacting dark energy models that isolates ω_DE' independently of interaction strength α and recovers it in CPL parametrization consistent with DESI data.
The Statefinder hierarchy: An extended null diagnostic for concordance cosmology,
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Beyond the equation of state: a second-order diagnostic for dynamical dark energy
Introduces curvature diagnostic C = ρ_DE''/ρ_DE for two-fluid interacting dark energy models that isolates ω_DE' independently of interaction strength α and recovers it in CPL parametrization consistent with DESI data.